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Changes In Branch zonefile Excluding Merge-Ins

This is equivalent to a diff from 15c587cf to 84e9351b

2018-02-27
20:09
Update zonefile README.md file to mention the frame cache. (Leaf check-in: 84e9351b user: dan tags: zonefile)
19:50
Rationalize some code in zonefile.c. Fix other minor issues in the same. (check-in: f11beb16 user: dan tags: zonefile)
2018-02-26
15:27
Always interpret non-zero floating-point values as true even if their integer part is zero. Fix for ticket [36fae083b450e3af857a459e20]. (check-in: a983fa85 user: drh tags: trunk)
03:20
Experimental implementation of IS TRUE and IS FALSE operators. All TRUE and FALSE to act like constants if the names do not resolve to a column name. (check-in: 40314bc9 user: drh tags: is-true-operator)
2018-02-23
13:45
Merge updates from trunk. (check-in: 53f2100a user: mistachkin tags: zonefile)
13:38
Fix harmless compiler warnings in the zipfile extension seen with MSVC. (check-in: 15c587cf user: mistachkin tags: trunk)
13:38
Enable the JSON1 extension when compiling the test fixture with MSVC. (check-in: e9e9f27b user: mistachkin tags: trunk)

Changes to Makefile.msc.

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  $(TOP)\ext\misc\amatch.c \
  $(TOP)\ext\misc\carray.c \
  $(TOP)\ext\misc\closure.c \
  $(TOP)\ext\misc\csv.c \
  $(TOP)\ext\misc\eval.c \
  $(TOP)\ext\misc\fileio.c \
  $(TOP)\ext\misc\fuzzer.c \

  $(TOP)\ext\fts5\fts5_tcl.c \
  $(TOP)\ext\fts5\fts5_test_mi.c \
  $(TOP)\ext\fts5\fts5_test_tok.c \
  $(TOP)\ext\misc\ieee754.c \
  $(TOP)\ext\misc\mmapwarm.c \
  $(TOP)\ext\misc\nextchar.c \
  $(TOP)\ext\misc\normalize.c \







>







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  $(TOP)\ext\misc\amatch.c \
  $(TOP)\ext\misc\carray.c \
  $(TOP)\ext\misc\closure.c \
  $(TOP)\ext\misc\csv.c \
  $(TOP)\ext\misc\eval.c \
  $(TOP)\ext\misc\fileio.c \
  $(TOP)\ext\misc\fuzzer.c \
  $(TOP)\ext\zonefile\zonefile.c \
  $(TOP)\ext\fts5\fts5_tcl.c \
  $(TOP)\ext\fts5\fts5_test_mi.c \
  $(TOP)\ext\fts5\fts5_test_tok.c \
  $(TOP)\ext\misc\ieee754.c \
  $(TOP)\ext\misc\mmapwarm.c \
  $(TOP)\ext\misc\nextchar.c \
  $(TOP)\ext\misc\normalize.c \

Added ext/zonefile/README.md.





















































































































































































































































































































































































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# The Zonefile Extension

## Functionality

### Creating Zonefile Files

To create a new zonefile, first create a database table with the following
schema:

>     CREATE TABLE data(
>       k INTEGER PRIMARY KEY,
>       frame INTEGER DEFAULT -1,   -- frame number.  Automatic if -1
>       idx INTEGER DEFAULT -1,     -- index of entry within frame.  Auto if -1
>       v BLOB
>     );

The table may be created in a persistent or temporary database and may
take any name, but must contain the columns above. The table must be 
populated with a row for each key intended to appear in the new zonefile
file.

Once the table is populated, a zonefile is created using the following
SQL:

>     SELECT zonefile_write(<file>, <table> [, <parameters>]);

where &lt;file&gt; is the name of the file to create on disk, &lt;table&gt; 
is the name of the database table to read and optional argument 
&lt;parameters&gt; is a JSON object containing various attributes that
influence creation of the zonefile file. 

Currently, the following &lt;parameters&gt; attributes are supported:

<table border=1>
<tr align=left><th>Attribute<th>Default<th>Interpretation
<tr valign=top><td>maxAutoFrameSize<td>65536
<td>The maximum uncompressed frame size in bytes for automatically generated
zonefile frames.

<tr valign=top><td>compressionTypeContent<td>"none"
<td>The compression type used to compress each frame in the zonefile. 
Valid values are "none" (no compression), "zstd", "zstd_global_dict",
"zlib", "brotli", "lz4" and "lz4hc". Not all compression methods are
supported by all builds. The compression method supported by a build
depends on the combination of SQLITE_HAVE_ZSTD, SQLITE_HAVE_ZLIB,
SQLITE_HAVE_BROTLI and SQLITE_HAVE_LZ4 pre-processor symbols defined
at build time.

<tr valign=top><td>compressionTypeIndexData<td>"none"
<td>The compression type used to compress the zonefile index structure.
All values that are valid for the <i>compressionTypeContent</i> parameter,
except for "zstd_global_dict", are also valid for this option.

<tr valign=top><td>encryptionType<td>"none"
<td>The encryption type to use. At present the only valid values are
"none" (no encryption) and "xor" (an insecure mock encryption method
useful for testing only). Enhanced implementations may support any or
all of the following encryption schemes:
<ul>
  <li> "AES_128_CTR"
  <li> "AES_128_CBC"
  <li> "AES_256_CTR"
  <li> "AES_256_CBC"
</ul>

<tr valign=top><td>encryptionKey<td>""
<td>The encryption key to use. The encryption key must be specified as an
even number of hexadecimal that will be converted to a binary key before
use. It is the responsibility of the caller to specify a key of the optimal
length for each encryption algorithm (e.g. 16 bytes (32 hex digits) for
a 128-bit encryption, or 32 bytes (64 digits) for a 256-bit method).
This option is ignored if <i>encryptionType</i> is set to "none".
</table>

For example, to create a zonefile named "test.zonefile" based on the
contents of database table "test_input", with a maximum automatic
frame size of 4096 bytes and using "xor" encryption with a 128-bit key:

>     SELECT zonefile_write('test.zonefile', 'test_input',
>       '{"maxAutoFrameSize":4096,
>         "encryptionType":"xor",
>         "encryptionKey":"e6e600bc063aad12f6387beab650c48a"
>       }'
>     );

### Using (Reading) Zonefile Files

To create a new zonefile table, one of the following:

>     CREATE VIRTUAL TABLE z1 USING zonefile;
>     CREATE VIRTUAL TABLE z1 USING zonefile(cachesize=N);

where <i>N</i> is any non-zero positive integer. If the zonefile is used
to access any files containing compressed or encrypted data, it maintains
an LRU cache of uncompressed frame data <i>N</i> frames in size. The
default value of <i>N</i> is 1.

Creating a "zonefile" virtual table actually creates two virtual tables in the
database schema. One read-only table named "z1", with a schema equivalent to:

>     CREATE TABLE z1(  -- this whole table is read-only
>       k INTEGER PRIMARY KEY,     -- key value
>       v BLOB,                    -- associated blob of data
>       fileid INTEGER,            -- file id (rowid value for z1_files)
>       sz INTEGER                 -- size of blob of data in bytes
>     );

And a read-write table named "z1_files" with a schema like:

>     CREATE TABLE z1_files(
>       filename TEXT PRIMARY KEY,
>       ekey BLOB,         -- encryption key
>       header JSON HIDDEN -- read-only
>     );

Both tables are initially empty. To add a zonefile to the index, insert a
row into the "z1_files" table:

>     INSERT INTO z1_files(filename) VALUES(<filename>);

If the file is an encrypted file, then the encryption key (a blob) must
be inserted into the "ekey" column. Encryption keys are not stored in the
database, they are held in main-memory only. This means that each new
connection must configure encryption key using UPDATE statements before
accessing any encrypted files. For example:

>     -- Add new encrypted file to database:
>     INSERT INTO z1_files(filename, ekey) VALUES(<filename>, <ekey>);
>
>     -- Configure encryption key for existing file after opening database:
>     UPDATE z1_files SET ekey = <ekey> WHERE filename = <filename>;

Currently, values provided for any columns other than "filename" and
"ekey" are ignored. Files are removed from the index by deleting rows 
from the z1_files table:

>     DELETE FROM z1_files WHERE filename = <filename>;

Once zonefile files have been added to the index, their contents are 
visible in table "z1". To retrieve the value associated with a single
key from one of the zonefile files in the index:

>     SELECT v FROM z1 WHERE k = <key>;


## Notes

  *  Contrary to the spec, the implementation uses 32-bit (not 16-bit) frame
     numbers. So the KeyOffsetPair structure becomes:

     KeyOffsetPair
     {
       uint64  key;
       uint32  frameNo;
       uint32  frameByteOffset;
     };

     Also, the ZonefileHeader.numFrames field is now 32-bit. Which makes
     the ZonefileHeader structure 26 bytes in size. The implementation
     pads this out to 32 bytes so that the ZoneFileIndex is 8-byte aligned.

  *  Multi-byte integer values are big-endian.

  *  The offsets in the ZoneFileIndex.byteOffsetZoneFrame[] array are
     relative to the offset in ZoneFileHeader.byteOffsetFrames. This is
     necessary as we may not know the offset of the start of the frame data
     until after the ZoneFileIndex structure is compressed.

  *  The offsets in the ZoneFileIndex.byteOffsetZoneFrame[] array are the
     offsets for the first byte past the end of the corresponding frame.
     For example, byteOffsetZoneFrame[] identifies the first byte of the
     second frame, and byteOffsetZoneFrame[numFrames-1] is one byte past
     the end of the last frame in the file.

     This is better as if we store the starting offset of each frame, there
     is no way to determine the size of the last frame in the file without
     trusting the filesize itself.

  *  Currently there is no support at all for encryption.

  *  Zonefile currently uses json1 to parse the json argument to
     zonefile\_write(). And so must be used with an SQLITE\_ENABLE\_JSON1
     or otherwise json1-enabled SQLite.


Added ext/zonefile/zonefile.c.















































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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/*
** 2018-02-10
**
** The author disclaims copyright to this source code.  In place of
** a legal notice, here is a blessing:
**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
******************************************************************************
*/

#include "sqlite3ext.h"
SQLITE_EXTENSION_INIT1
#ifndef SQLITE_OMIT_VIRTUALTABLE

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

/*
** Default values for various zonefile_write() parameters.
*/
#define ZONEFILE_DEFAULT_MAXAUTOFRAMESIZE (64*1024)
#define ZONEFILE_DEFAULT_ENCRYPTION       1
#define ZONEFILE_DEFAULT_COMPRESSION      0
#define ZONEFILE_DEFAULT_DICTSIZE         (64*1024)

/* 
** Value to use for the first 4 bytes of a zonefile file header.
*/
#define ZONEFILE_MAGIC_NUMBER 0x464B3138

/*
** Size of a zonefile header. And of each entry in the 
** ZonefileIndex.keyOffsets array.
*/
#define ZONEFILE_SZ_HEADER           32
#define ZONEFILE_SZ_KEYOFFSETS_ENTRY 20

/*
** Constants for supported compression types. These are copied from the
** published file format spec.
*/
#define ZONEFILE_COMPRESSION_NONE             0
#define ZONEFILE_COMPRESSION_ZSTD             1
#define ZONEFILE_COMPRESSION_ZSTD_GLOBAL_DICT 2
#define ZONEFILE_COMPRESSION_ZLIB             3
#define ZONEFILE_COMPRESSION_BROTLI           4
#define ZONEFILE_COMPRESSION_LZ4              5
#define ZONEFILE_COMPRESSION_LZ4HC            6

/*
** Schema for "zonefile" virtual table.
*/
#define ZONEFILE_SCHEMA          \
  "CREATE TABLE z1("             \
  "  k INTEGER PRIMARY KEY,"     \
  "  v BLOB,"                    \
  "  fileid INTEGER,"            \
  "  sz INTEGER"                 \
  ")"

/*
** Schema for "zonefile_files" virtual table.
*/
#define ZONEFILE_FILES_SCHEMA    \
  "CREATE TABLE z2("             \
  "  filename TEXT,"             \
  "  ekey BLOB,"                 \
  "  header JSON HIDDEN"         \
  ")"


#ifndef SQLITE_AMALGAMATION
typedef sqlite3_int64 i64;
typedef sqlite3_uint64 u64;
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned long u32;
#define MIN(a,b) ((a)<(b) ? (a) : (b))

#if defined(SQLITE_COVERAGE_TEST) || defined(SQLITE_MUTATION_TEST)
# define ALWAYS(X)      (1)
# define NEVER(X)       (0)
#elif !defined(NDEBUG)
# define ALWAYS(X)      ((X)?1:(assert(0),0))
# define NEVER(X)       ((X)?(assert(0),1):0)
#else
# define ALWAYS(X)      (X)
# define NEVER(X)       (X)
#endif
#endif   /* SQLITE_AMALGAMATION */

/*
** Forward declarations for encryption/decryption functions.
**
** If this module is not compiled with SQLITE_HAVE_ZONEFILE_CODEC, then
** implementations of the following type and functions that support the
** mock encryption method "xor" only are provided. Alternatively, the
** application may append a more functional implementation of the following 
** type and functions to this file before compiling it with
** SQLITE_HAVE_ZONEFILE_CODEC defined.
*/
typedef struct ZonefileCodec ZonefileCodec;
static int zonefileCodecCreate(
    int,int,unsigned char*,int,ZonefileCodec**,char**);
static int zonefileCodecNonceSize(ZonefileCodec*);
static void zonefileCodecEncode(ZonefileCodec*, unsigned char*, int);
static void zonefileCodecDecode(ZonefileCodec*, unsigned char*, int);
static void zonefileCodecDestroy(ZonefileCodec*);

#ifndef SQLITE_HAVE_ZONEFILE_CODEC
typedef struct ZonefileCodec ZonefileCodec;

struct ZonefileCodec {
  u8 aKey[16];
  int bEncrypt;                   /* Second parameter passed to Create() */
};

/* Create a new encryption module instance using algorithm iAlg.
**
**   iAlg==1   AES128 CTR
**   iAlg==2   AES128 CBC
**   iAlg==3   AES256 CTR
**   iAlg==4   AES256 CBC
**   iAlg==5   XOR          Testing use only
**
** If the requested algorithm is not available, the routine returns
** a NULL pointer.  NULL is also returned on a OOM error.
**
** Use zonefileCodecDestroy() to reclaim memory.
*/
static int zonefileCodecCreate(
  int iAlg, 
  int bEncrypt,                   /* True for encryption, zero for decryption */
  unsigned char *pKey, int nKey, 
  ZonefileCodec **pp, 
  char **pzErr
){
  ZonefileCodec *pRet;
  int rc = SQLITE_OK;
  
  if( iAlg!=5 ){
    *pzErr = sqlite3_mprintf("unsupported encryption method: %d", iAlg);
    rc = SQLITE_ERROR;
  }else{
    *pp = pRet = (ZonefileCodec*)sqlite3_malloc(sizeof(ZonefileCodec));
    if( pRet==0 ){
      rc = SQLITE_NOMEM;
    }else{
      int i;
      for(i=0; i<sizeof(pRet->aKey); i++){
        pRet->aKey[i] = pKey[i % nKey];
      }
      pRet->bEncrypt = bEncrypt;
    }
  }

  return rc;
}

/* Return the size of the nonce used for the given encryption module */
static int zonefileCodecNonceSize(ZonefileCodec *pCodec){
  return 16;
}

/* Encrypt in-place.
**
** The size of the content will grow by the nonce size.  Hence, the
** buffer must have at least nonce bytes of extra space available at
** the end to accommodate that growth.  When persisting results, be
** sure to include the extra bytes.
*/
static void zonefileCodecEncode(
  ZonefileCodec *pCodec,
  unsigned char *pIn, int nIn
){
  int i;
  u8 *aNonce = &pIn[nIn];
  assert( pCodec->bEncrypt );
  sqlite3_randomness(16, aNonce);
  for(i=0; i<nIn; i++){
    pIn[i] = pIn[i] ^ aNonce[i%16] ^ pCodec->aKey[i%16];
  }
}

/* Decrypt in-place.
**
** The size of the decrypted text will be less than the input buffer
** by nonce-size bytes.
*/
static void zonefileCodecDecode(
  ZonefileCodec *pCodec, 
  unsigned char *pIn, int nIn
){
  int i;
  u8 *aNonce = &pIn[nIn-16];
  assert( pCodec->bEncrypt==0 );
  for(i=0; i<nIn-16; i++){
    pIn[i] = pIn[i] ^ aNonce[i%16] ^ pCodec->aKey[i%16];
  }
}

/* Destroy an encryption module.
** It is harmless to pass in a NULL pointer.
*/
static void zonefileCodecDestroy(ZonefileCodec *pCodec){
  sqlite3_free(pCodec);
}
#endif                           /* SQLITE_HAVE_ZONEFILE_CODEC */

/*
** All zonefile and zonefile_files virtual table instances that belong
** to the same database handle (sqlite3*) share a single instance of the
** ZonefileGlobal object. This global object contains a table of 
** configured encryption keys for the various zonefiles in the system.
*/
typedef struct ZonefileGlobal ZonefileGlobal;
typedef struct ZonefileKey ZonefileKey;
struct ZonefileGlobal {
  int nEntry;                     /* Number of entries in the hash table */
  int nHash;                      /* Size of aHash[] array */
  ZonefileKey **aHash;            /* Hash buckets */
};
struct ZonefileKey {
  const char *zName;              /* Zonefile table name */
  const char *zDb;                /* Database name ("main", "temp" etc.) */
  i64 iFileid;                    /* File id */
  const u8 *aKey;                 /* Key buffer */
  int nKey;                       /* Size of zKey in bytes */
  u32 iHash;                      /* zonefileKeyHash() value */
  ZonefileKey *pHashNext;         /* Next colliding key in hash table */
};

/*
** Return a 32-bit hash value for the three arguments.
*/
static u32 zonefileKeyHash(
  const char *zDb,
  const char *zTab,
  i64 iFileid
){
  u32 iHash = 0;
  int i;
  for(i=0; zDb[i]; i++) iHash += (iHash<<3) + (u8)zDb[i];
  for(i=0; zTab[i]; i++) iHash += (iHash<<3) + (u8)zTab[i];
  return (iHash ^ (iFileid & 0xFFFFFFFF));
}

/* 
** Store encryption key aKey in the key-store passed as the first argument.
** Return SQLITE_OK if successful, or an SQLite error code (SQLITE_NOMEM)
** otherwise.
*/
static int zonefileKeyStore(
  ZonefileGlobal *pGlobal,
  const char *zDb,                /* Database containing zonefile table */
  const char *zTab,               /* Name of zonefile table */
  i64 iFileid,                    /* File-id to configure key for */
  const u8 *aKey,                 /* Key to store */
  int nKey                        /* Size of aKey[] in bytes */
){
  ZonefileKey **pp;
  u32 iHash = zonefileKeyHash(zDb, zTab, iFileid);

  /* Remove any old entry */
  if( pGlobal->nHash ){
    for(pp=&pGlobal->aHash[iHash%pGlobal->nHash]; *pp; pp=&((*pp)->pHashNext)){
      ZonefileKey *pThis = *pp;
      if( pThis->iFileid==iFileid 
          && 0==sqlite3_stricmp(zTab, pThis->zName)
          && 0==sqlite3_stricmp(zDb, pThis->zDb)
        ){
        pGlobal->nEntry--;
        *pp = pThis->pHashNext;
        sqlite3_free(pThis);
        break;
      }
    }
  }

  if( aKey ){
    int nDb = strlen(zDb);
    int nTab = strlen(zTab);
    ZonefileKey *pNew;

    /* Resize the hash-table, if necessary */
    if( pGlobal->nEntry>=pGlobal->nHash ){
      int i;
      int n = pGlobal->nHash ? pGlobal->nHash*2 : 16;
      ZonefileKey **a = (ZonefileKey**)sqlite3_malloc(n*sizeof(ZonefileKey*));
      if( a==0 ) return SQLITE_NOMEM;
      memset(a, 0, n*sizeof(ZonefileKey*));
      for(i=0; i<pGlobal->nHash; i++){
        ZonefileKey *p;
        ZonefileKey *pNext;
        for(p=pGlobal->aHash[i]; p; p=pNext){
          pNext = p->pHashNext;
          p->pHashNext = a[p->iHash % n];
          a[p->iHash % n] = p;
        }
      }
      sqlite3_free(pGlobal->aHash);
      pGlobal->aHash = a;
      pGlobal->nHash = n;
    }

    pNew = (ZonefileKey*)sqlite3_malloc(
        sizeof(ZonefileKey) + nKey+1 + nDb+1 + nTab+1
    );
    if( pNew==0 ) return SQLITE_NOMEM;
    memset(pNew, 0, sizeof(ZonefileKey));
    pNew->iFileid = iFileid;
    pNew->iHash = iHash;
    pNew->aKey = (const u8*)&pNew[1];
    pNew->nKey = nKey;
    pNew->zDb = (const char*)&pNew->aKey[nKey+1];
    pNew->zName = &pNew->zDb[nDb+1];
    memcpy((u8*)pNew->aKey, aKey, nKey+1);
    memcpy((char*)pNew->zDb, zDb, nDb+1);
    memcpy((char*)pNew->zName, zTab, nTab+1);

    pNew->pHashNext = pGlobal->aHash[iHash % pGlobal->nHash];
    pGlobal->aHash[iHash % pGlobal->nHash] = pNew;
    pGlobal->nEntry++;
  }

  return SQLITE_OK;
}

/*
** Search the key-store passed as the first argument for an encryption
** key to use with the file with file-id iFileid in zonefile table zTab
** in database zDb. If successful, set (*paKey) to point to the key
** buffer and return the size of the key in bytes.
**
** If no key is found, return 0. The final value of (*paKey) is undefined
** in this case.
*/
static int zonefileKeyFind(
  ZonefileGlobal *pGlobal,
  const char *zDb,                /* Database containing zonefile table */
  const char *zTab,               /* Name of zonefile table */
  i64 iFileid,                    /* File-id to configure key for */
  const u8 **paKey                /* OUT: Pointer to key buffer */
){
  if( pGlobal->nHash ){
    ZonefileKey *pKey;
    u32 iHash = zonefileKeyHash(zDb, zTab, iFileid);
    for(pKey=pGlobal->aHash[iHash%pGlobal->nHash]; pKey; pKey=pKey->pHashNext){
      if( pKey->iFileid==iFileid 
       && 0==sqlite3_stricmp(zTab, pKey->zName)
       && 0==sqlite3_stricmp(zDb, pKey->zDb)
      ){
        *paKey = pKey->aKey;
        return pKey->nKey;
      }
    }
  }

  return 0;
}

/*
** The pointer passed as the only argument must actually point to a
** ZonefileGlobal structure. This function frees the structure and all
** of its components.
*/
static void zonefileKeyDestroy(void *p){
  ZonefileGlobal *pGlobal = (ZonefileGlobal*)p;
  int i;
  for(i=0; i<pGlobal->nHash; i++){
    ZonefileKey *pKey;
    ZonefileKey *pNext;
    for(pKey=pGlobal->aHash[i]; pKey; pKey=pNext){
      pNext = pKey->pHashNext;
      sqlite3_free(pKey);
    }
  }
  sqlite3_free(pGlobal->aHash);
  sqlite3_free(pGlobal);
}

/*
** Write value v to buffer aBuf as an unsigned 32-bit big-endian integer.
*/
static void zonefilePut32(u8 *aBuf, u32 v){
  aBuf[0] = (v >> 24) & 0xFF;
  aBuf[1] = (v >> 16) & 0xFF;
  aBuf[2] = (v >>  8) & 0xFF;
  aBuf[3] = v & 0xFF;
}

/*
** Read and return an unsigned 32-bit big-endian integer from buffer aBuf.
*/
static u32 zonefileGet32(const u8 *aBuf){
  return (((u32)aBuf[0]) << 24)
       + (((u32)aBuf[1]) << 16)
       + (((u32)aBuf[2]) <<  8)
       + (((u32)aBuf[3]) <<  0);
}

/*
** Generic xOpen, xClose and xUncompressSize methods used by a few
** different compression method bindings.
*/
static int zfGenericOpen(void **pp, u8 *aDict, int nDict){
  *pp = 0;
  return SQLITE_OK;
}
static void zfGenericClose(void *p){
}
static int zfGenericUncompressSize(
  void *p, 
  const u8 *aSrc, int nSrc
){
  return (int)zonefileGet32(aSrc);
}

#ifdef SQLITE_HAVE_ZLIB 
#include <zlib.h>
static int zfZlibCompressBound(void *p, int nSrc){
  return (int)compressBound((uLong)nSrc) + 4;
}
static int zfZlibCompress(
  void *p, 
  u8 *aDest, int *pnDest, 
  const u8 *aSrc, int nSrc
){
  uLongf destLen = (uLongf)(*pnDest)-4;
  int rc = compress(&aDest[4], &destLen, aSrc, (uLong)nSrc);
  *pnDest = (int)(destLen+4);
  zonefilePut32(aDest, nSrc);
  return rc==Z_OK ? SQLITE_OK : SQLITE_ERROR;
}
static int zfZlibUncompress(
  void *p, 
  u8 *aDest, int nDest, 
  const u8 *aSrc, int nSrc
){
  uLongf destLen = (uLongf)nDest;
  int rc = uncompress(aDest, &destLen, &aSrc[4], (uLong)nSrc-4);
  return rc==Z_OK ? SQLITE_OK : SQLITE_ERROR;
}
#endif
#ifdef SQLITE_HAVE_ZSTD 
#include <zstd.h>
static int zfZstdCompressBound(void *p, int nSrc){
  return (int)ZSTD_compressBound((size_t)nSrc);
}
static int zfZstdCompress(
  void *p, 
  u8 *aDest, int *pnDest, 
  const u8 *aSrc, int nSrc
){
  size_t szDest = (size_t)(*pnDest);
  size_t rc = ZSTD_compress(aDest, szDest, aSrc, (size_t)nSrc, 1);
  if( ZSTD_isError(rc) ) return SQLITE_ERROR;
  *pnDest = (int)rc;
  return SQLITE_OK;
}
static int zfZstdUncompressSize(void *p, const u8 *aSrc, int nSrc){
  return (int)ZSTD_getFrameContentSize(aSrc, (size_t)nSrc);
}
static int zfZstdUncompress(
  void *p, 
  u8 *aDest, int nDest, 
  const u8 *aSrc, int nSrc
){
  size_t rc = ZSTD_decompress(aDest, (size_t)nDest, aSrc, (size_t)nSrc);
  if( rc!=(size_t)nDest ) return SQLITE_ERROR;
  return SQLITE_OK;
}

#include <zdict.h>
typedef struct ZfZstddict ZfZstddict;
struct ZfZstddict {
  ZSTD_CDict *pCDict;
  ZSTD_CCtx *pCCtx;
  ZSTD_DDict *pDDict;
  ZSTD_DCtx *pDCtx;
};

static void zfZstddictClose(void *p){
  if( p ){
    ZfZstddict *pCmp = (ZfZstddict*)p;
    if( pCmp->pCDict ) ZSTD_freeCDict(pCmp->pCDict);
    if( pCmp->pCCtx ) ZSTD_freeCCtx(pCmp->pCCtx);
    if( pCmp->pDCtx ) ZSTD_freeDCtx(pCmp->pDCtx);
    sqlite3_free(pCmp);
  }
}
static int zfZstddictOpen(void **pp, u8 *aDict, int nDict){
  int rc = SQLITE_OK;
  ZfZstddict *pDict = (ZfZstddict*)sqlite3_malloc(sizeof(ZfZstddict));
  if( pDict==0 ){
    rc = SQLITE_NOMEM;
  }else{
    memset(pDict, 0, sizeof(ZfZstddict));
    if( aDict ){
      pDict->pDDict = ZSTD_createDDict(aDict, nDict);
      pDict->pDCtx = ZSTD_createDCtx();
      if( pDict->pDDict==0 || pDict->pDCtx==0 ){
        zfZstddictClose((void*)pDict);
        pDict = 0;
        rc = SQLITE_ERROR;
      }
    }
  }
  *pp = (void*)pDict;
  return rc;
}
static int zfZstddictTrain(
  void *p,                        /* Compressor handle */
  u8 *aDict, int *pnDict,         /* OUT: Dictionary buffer */
  u8 *aSamp, size_t *aSz, int nSamp  /* IN: Training samples */
){
  ZfZstddict *pCmp = (ZfZstddict*)p;
  size_t sz = ZDICT_trainFromBuffer(aDict, (size_t)*pnDict, aSamp, aSz, nSamp);
  if( ZDICT_isError(sz) ) return SQLITE_ERROR;
  pCmp->pCDict = ZSTD_createCDict(aDict, sz, 1);
  pCmp->pCCtx = ZSTD_createCCtx();
  if( pCmp->pCDict==0 || pCmp->pCCtx==0 ) return SQLITE_ERROR;
  *pnDict = (int)sz;
  return SQLITE_OK;
}
static int zfZstddictCompress(
  void *p, 
  u8 *aDest, int *pnDest, 
  const u8 *aSrc, int nSrc
){
  ZfZstddict *pCmp = (ZfZstddict*)p;
  size_t szDest = (size_t)(*pnDest);
  size_t rc;
  assert( pCmp && pCmp->pCDict && pCmp->pCCtx );
  rc = ZSTD_compress_usingCDict(
      pCmp->pCCtx, aDest, szDest, aSrc, (size_t)nSrc, pCmp->pCDict
  );
  if( ZSTD_isError(rc) ) return SQLITE_ERROR;
  *pnDest = (int)rc;
  return SQLITE_OK;
}
static int zfZstddictUncompress(
  void *p, 
  u8 *aDest, int nDest, 
  const u8 *aSrc, int nSrc
){
  ZfZstddict *pCmp = (ZfZstddict*)p;
  size_t rc = ZSTD_decompress_usingDDict(
      pCmp->pDCtx, aDest, (size_t)nDest, aSrc, (size_t)nSrc, pCmp->pDDict
  );
  if( rc!=(size_t)nDest ) return SQLITE_ERROR;
  return SQLITE_OK;
}
#endif

#ifdef SQLITE_HAVE_LZ4 
#include <lz4.h>
#include <lz4hc.h>
static int zfLz4CompressBound(void *p, int nSrc){
  return (int)LZ4_compressBound(nSrc) + 4;
}
static int zfLz4Uncompress(
  void *p, 
  u8 *aDest, int nDest, 
  const u8 *aSrc, int nSrc
){
  int rc = LZ4_decompress_safe(
      (const char*)&aSrc[4], (char*)aDest, nSrc-4, nDest
  );
  return rc==nDest ? SQLITE_OK : SQLITE_ERROR;
}
static int zfLz4Compress(
  void *p, 
  u8 *aDest, int *pnDest, 
  const u8 *aSrc, int nSrc
){
  int rc = LZ4_compress_default(
      (const char*)aSrc, (char*)&aDest[4], nSrc, (*pnDest - 4)
  );
  *pnDest = rc+4;
  zonefilePut32(aDest, nSrc);
  return rc==0 ? SQLITE_ERROR : SQLITE_OK;
}
static int zfLz4hcCompress(
  void *p, 
  u8 *aDest, int *pnDest, 
  const u8 *aSrc, int nSrc
){
  int rc = LZ4_compress_HC(
      (const char*)aSrc, (char*)&aDest[4], nSrc, *pnDest, 0
  );
  *pnDest = rc+4;
  zonefilePut32(aDest, nSrc);
  return rc==0 ? SQLITE_ERROR : SQLITE_OK;
}
#endif

#ifdef SQLITE_HAVE_BROTLI 
#include <brotli/encode.h>
#include <brotli/decode.h>

static int zfBrotliCompressBound(void *p, int nSrc){
  return (int)BrotliEncoderMaxCompressedSize((size_t)nSrc) + 4;
}
static int zfBrotliCompress(
  void *p, 
  u8 *aDest, int *pnDest, 
  const u8 *aSrc, int nSrc
){
  size_t nDest = (size_t)*pnDest - 4;
  BROTLI_BOOL rc = BrotliEncoderCompress(
      BROTLI_DEFAULT_QUALITY, BROTLI_DEFAULT_WINDOW, BROTLI_DEFAULT_MODE,
      (size_t)nSrc, aSrc, &nDest, &aDest[4]
  );
  *pnDest = (int)nDest + 4;
  zonefilePut32(aDest, nSrc);
  return rc==0 ? SQLITE_ERROR : SQLITE_OK;
}
static int zfBrotliUncompress(
  void *p, 
  u8 *aDest, int nDest, 
  const u8 *aSrc, int nSrc
){
  size_t n = nDest;
  BrotliDecoderResult rc = BrotliDecoderDecompress(nSrc-4, &aSrc[4], &n, aDest);
  return rc==BROTLI_DECODER_RESULT_SUCCESS ? SQLITE_OK : SQLITE_ERROR;
}
#endif

typedef struct ZonefileCompress ZonefileCompress;
static struct ZonefileCompress {
  int eType;
  const char *zName;
  int (*xOpen)(void**, u8 *aDict, int nDict);
  void (*xClose)(void*);
  int (*xTrain)(void*, u8 *aDict, int *pnDict, u8 *a, size_t *aSz, int n);
  int (*xCompressBound)(void*, int nSrc);
  int (*xCompress)(void*, u8 *aDest, int *pnDest, const u8 *aSrc, int nSrc);
  int (*xUncompressSize)(void*, const u8 *aSrc, int nSrc);
  int (*xUncompress)(void*, u8 *aDest, int nDest, const u8 *aSrc, int nSrc);
} aZonefileCompress[] = {
  { ZONEFILE_COMPRESSION_NONE,             "none",
    0, 0, 0, 0, 0, 0, 0
  },
#ifdef SQLITE_HAVE_ZSTD
  { ZONEFILE_COMPRESSION_ZSTD,             "zstd",
    zfGenericOpen, zfGenericClose, 
    0,
    zfZstdCompressBound, zfZstdCompress, 
    zfZstdUncompressSize, zfZstdUncompress
  },
  { ZONEFILE_COMPRESSION_ZSTD_GLOBAL_DICT, "zstd_global_dict",
    zfZstddictOpen, zfZstddictClose, 
    zfZstddictTrain,
    zfZstdCompressBound, zfZstddictCompress, 
    zfZstdUncompressSize, zfZstddictUncompress
  },
#endif /* SQLITE_HAVE_ZSTD */
#ifdef SQLITE_HAVE_ZLIB
  { ZONEFILE_COMPRESSION_ZLIB,             "zlib",
    zfGenericOpen, zfGenericClose, 
    0,
    zfZlibCompressBound, zfZlibCompress, 
    zfGenericUncompressSize, zfZlibUncompress
  },
#endif /* SQLITE_HAVE_ZLIB */
#ifdef SQLITE_HAVE_BROTLI
  { ZONEFILE_COMPRESSION_BROTLI,           "brotli",
    zfGenericOpen, zfGenericClose, 
    0,
    zfBrotliCompressBound, zfBrotliCompress, 
    zfGenericUncompressSize, zfBrotliUncompress
  },
#endif /* SQLITE_HAVE_BROTLI */
#ifdef SQLITE_HAVE_LZ4
  { ZONEFILE_COMPRESSION_LZ4,              "lz4",
    zfGenericOpen, zfGenericClose, 
    0,
    zfLz4CompressBound, zfLz4Compress, 
    zfGenericUncompressSize, zfLz4Uncompress
  },
  { ZONEFILE_COMPRESSION_LZ4HC,            "lz4hc",
    zfGenericOpen, zfGenericClose, 
    0,
    zfLz4CompressBound, zfLz4hcCompress, 
    zfGenericUncompressSize, zfLz4Uncompress
  },
#endif /* SQLITE_HAVE_LZ4 */
};

/*
** Find the ZonefileCompress object for the compression scheme named
** by zName. If successful, set output variable (*pp) to point to the
** object and return SQLITE_OK. Otherwise, return SQLITE_ERROR and
** leave output variable (*pzErr) pointing to an English language error
** message. It is the reponsibility of the caller to eventually free
** the error message buffer using sqlite3_free().
*/
static int zonefileCompress(
  const char *zName,              /* Name of requested compression method */
  ZonefileCompress **pp,          /* OUT: Pointer to compression object */
  char **pzErr                    /* OUT: Error message */
){
  int i;
  assert( *pzErr==0 );
  for(i=0; i<sizeof(aZonefileCompress)/sizeof(aZonefileCompress[0]); i++){
    if( sqlite3_stricmp(aZonefileCompress[i].zName, zName)==0 ){
      *pp = &aZonefileCompress[i];
      return SQLITE_OK;
    }
  }
  *pzErr = sqlite3_mprintf("unknown compression scheme: \"%s\"", zName);
  return SQLITE_ERROR;
}

/*
** Find a compression routine based on its associated integer constant
** (defined as part of the zonefile file format). If successful, return
** a pointer to the associated ZonefileCompression object. Or, if the
** nominated compression scheme is not supported in this build, return 
** NULL.
*/
static ZonefileCompress *zonefileCompressByValue(int eType){
  int i;
  for(i=0; i<sizeof(aZonefileCompress)/sizeof(aZonefileCompress[0]); i++){
    if( aZonefileCompress[i].eType==eType ){
      return &aZonefileCompress[i];
    }
  }
  return 0;
}

/* End of code for compression routines
**************************************************************************/


/*
** A structure to store the parameters for a single zonefile_write()
** invocation. An instance of this structure is populated based on
** the json parameters passed to zonefile_write() by function
** zonefileGetParams();
*/
typedef struct ZonefileParam ZonefileParam;
struct ZonefileParam {
  ZonefileCompress *pCmpIdx;      /* For compressing the index */
  ZonefileCompress *pCmpData;     /* For compressing each frame */
  int encryptionType;
  int maxAutoFrameSize;
  int debugExtendedHeaderSize;    /* Size of extended header */
  int debugEncryptionKeyText;     /* True to allow text keys */
  char *encryptionKey;            /* Encryption key */
};

/*
** A structure to store a deserialized zonefile header in.
*/
typedef struct ZonefileHeader ZonefileHeader;
struct ZonefileHeader {
  u32 magicNumber;
  u8 compressionTypeIndexData;
  u8 compressionTypeContent;
  u32 byteOffsetDictionary;
  u32 byteOffsetFrames;
  u32 numFrames;
  u32 numKeys;
  u8 encryptionType;
  u8 encryptionKeyIdx;
  u8 extendedHeaderVersion;
  u8 extendedHeaderSize;
};

/*
** Resizable buffer structure used by the zonefile_write() implementation.
*/
typedef struct ZonefileBuffer ZonefileBuffer;
struct ZonefileBuffer {
  u8 *a;
  int n;
  int nAlloc;
};

/*
** Set the error message contained in context ctx to the results of
** vprintf(zFmt, ...).
*/
static void zonefileCtxError(sqlite3_context *ctx, const char *zFmt, ...){
  char *zMsg = 0;
  va_list ap;
  va_start(ap, zFmt);
  zMsg = sqlite3_vmprintf(zFmt, ap);
  sqlite3_result_error(ctx, zMsg, -1);
  sqlite3_free(zMsg);
  va_end(ap);
}

/*
** Retrieve the error message from the database handle associated with
** context object pCtx and copy it into pCtx itself.
*/
static void zonefileTransferError(sqlite3_context *pCtx){
  sqlite3 *db = sqlite3_context_db_handle(pCtx);
  const char *zErr = sqlite3_errmsg(db);
  sqlite3_result_error(pCtx, zErr, -1);
}

/*
** Create an SQL statement from the printf() style format string passed
** as the 4th argument and any trailing arguments. Attempt to prepare
** it against database handle db. If successful, set output variable
** (*ppStmt) to point to the new statement handle and return SQLITE_OK.
** In this case it is the responsibility of the caller to eventually
** release the statement handle using sqlite3_finalize().
**
** Or, if an error occurs, return an SQLite error code and optionally
** set output parameter (*pzErr) to point to a buffer containing an
** English language error message. The caller must eventually free any
** such buffer using sqlite3_free().
*/
static int zonefilePrepare(
  sqlite3 *db,                    /* Database handle */
  sqlite3_stmt **ppStmt,          /* OUT: New statement handle */
  char **pzErr,                   /* OUT: Error message */
  const char *zFmt,               /* printf() style formatting string */
  ...
){
  int rc;
  va_list ap;
  char *zSql;
  va_start(ap, zFmt);
  zSql = sqlite3_vmprintf(zFmt, ap);
  *ppStmt = 0;
  if( zSql ){
    rc = sqlite3_prepare_v2(db, zSql, -1, ppStmt, 0);
    if( rc!=SQLITE_OK ){
      *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db));
    }
    sqlite3_free(zSql);
  }else{
    rc = SQLITE_NOMEM;
  }
  return rc;
}

/*
** Return zero if the two SQL values passed as arguments are equal, or
** non-zero otherwise. Values with different types are considered unequal,
** even if they both contain the same numeric value (e.g. 2 and 2.0).
*/
static int zonefileCompareValue(sqlite3_value *p1, sqlite3_value *p2){
  int eType;
  assert( p1 );
  eType = sqlite3_value_type(p1);
  if( sqlite3_value_type(p2)!=eType ) return 1;
  switch( eType ){
    case SQLITE_INTEGER:
      return sqlite3_value_int64(p1)!=sqlite3_value_int64(p2);
    case SQLITE_FLOAT:
      return sqlite3_value_double(p1)!=sqlite3_value_double(p2);
    case SQLITE_TEXT:
    case SQLITE_BLOB: {
      int n1 = sqlite3_value_bytes(p1);
      int n2 = sqlite3_value_bytes(p2);
      if( n1!=n2 ) return 1;
      return memcmp(sqlite3_value_blob(p1), sqlite3_value_blob(p2), n1);
    }
    default:
      assert( eType==SQLITE_NULL);
  }

  return 0;
}

/*
** Return true if the value object passed as the only argument contains
** integer value -1. False otherwise.
*/
int zonefileIsAutoFrame(sqlite3_value *pFrame){
  return (
      sqlite3_value_type(pFrame)==SQLITE_INTEGER 
   && sqlite3_value_int64(pFrame)==-1
  );
}

#define SQLITE_ZONEFILE_AES_128_CTR 1
#define SQLITE_ZONEFILE_AES_128_CBC 2
#define SQLITE_ZONEFILE_AES_256_CTR 3
#define SQLITE_ZONEFILE_AES_256_CBC 4

/*
** Argument zName is the name of an encryption scheme. If it is recognized
** output variable (*peType) is set to the corresponding integer constant
** (defined as part of the zonefile file format) and SQLITE_OK is returned.
** Or, if the named encryption method is not recognized, SQLITE_ERROR is
** returned and (*pzErr) set to point to a buffer containing an English
** language error message. In this case it is the responsibility of
** the caller to eventually free the error message buffer using a call
** to sqlite3_free().
*/
static int zonefileEncryption(const char *zName, int *peType, char **pzErr){
  struct Encryption {
    const char *zName;
    int eType;
  } a[] = {
    {"NONE", 0}, 
    {"AES_128_CTR", SQLITE_ZONEFILE_AES_128_CTR}, 
    {"AES_128_CBC", SQLITE_ZONEFILE_AES_128_CBC}, 
    {"AES_256_CTR", SQLITE_ZONEFILE_AES_256_CTR}, 
    {"AES_256_CBC", SQLITE_ZONEFILE_AES_256_CBC}, 
    {"XOR",         5}, 
  };
  int i;

  for(i=0; i<sizeof(a)/sizeof(a[0]); i++){
    if( 0==sqlite3_stricmp(zName, a[i].zName) ){
      *peType = a[i].eType;
      return SQLITE_OK;
    }
  }

  *pzErr = sqlite3_mprintf("unknown encryption method: %s", zName);
  return SQLITE_ERROR;
}

/*
** Interpret the "json paramaters" argument passed to an invocation of
** the zonefile_write() SQL function. Populate the ZonefileParam indicated
** by the 3rd argument to this function with the results.
**
** If successful, return SQLITE_OK. Otherwise, return an SQLite error
** code and leave an error message in context object pCtx.
*/
static int zonefileGetParams(
  sqlite3_context *pCtx,          /* Leave any error message here */
  const char *zJson,              /* JSON configuration parameter (or NULL) */
  ZonefileParam *p                /* Populate this object before returning */
){
  sqlite3 *db = sqlite3_context_db_handle(pCtx);
  sqlite3_stmt *pStmt = 0;
  char *zErr = 0;
  int rc = SQLITE_OK;
  int rc2;

  memset(p, 0, sizeof(ZonefileParam));
  p->maxAutoFrameSize = ZONEFILE_DEFAULT_MAXAUTOFRAMESIZE;
  p->encryptionType = ZONEFILE_DEFAULT_ENCRYPTION;
  p->pCmpData = p->pCmpIdx = zonefileCompressByValue(ZONEFILE_COMPRESSION_NONE);

  rc = zonefilePrepare(db, &pStmt, &zErr,"SELECT key, value FROM json_each(?)");
  if( rc==SQLITE_OK ){
    sqlite3_bind_text(pStmt, 1, zJson, -1, SQLITE_STATIC);
  }
  while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pStmt) ){
    const char *zKey = (const char*)sqlite3_column_text(pStmt, 0);
    int iVal = sqlite3_column_int(pStmt, 1);
    if( sqlite3_stricmp("debugExtendedHeaderSize", zKey)==0 ){
      if( iVal<0 || iVal>255 ){
        zErr = sqlite3_mprintf(
            "debugExtendedHeaderSize value out of range: %d", iVal
        );
        rc = SQLITE_ERROR;
      }
      p->debugExtendedHeaderSize = iVal;
    }else
    if( sqlite3_stricmp("debugEncryptionKeyText", zKey)==0 ){
      p->debugEncryptionKeyText = iVal;
    }else
    if( sqlite3_stricmp("maxAutoFrameSize", zKey)==0 ){
      p->maxAutoFrameSize = iVal;
    }else
    if( sqlite3_stricmp("compressionTypeIndexData", zKey)==0 ){
      const char *zName = (const char*)sqlite3_column_text(pStmt, 1);
      rc = zonefileCompress(zName, &p->pCmpIdx, &zErr);
    }else
    if( sqlite3_stricmp("compressionTypeContent", zKey)==0 ){
      const char *zName = (const char*)sqlite3_column_text(pStmt, 1);
      rc = zonefileCompress(zName, &p->pCmpData, &zErr);
    }else
    if( sqlite3_stricmp("encryptionKey", zKey)==0 ){
      const char *zKey = (const char*)sqlite3_column_text(pStmt, 1);
      p->encryptionKey = sqlite3_mprintf("%s", zKey);
      if( p->encryptionKey==0 ) rc = SQLITE_NOMEM;
    }else
    if( sqlite3_stricmp("encryptionType", zKey)==0 ){
      const char *zName = (const char*)sqlite3_column_text(pStmt, 1);
      rc = zonefileEncryption(zName, &p->encryptionType, &zErr);
    }else{
      rc = SQLITE_ERROR;
      zErr = sqlite3_mprintf("unknown parameter name: \"%s\"", zKey);
    }
  }
  rc2 = sqlite3_finalize(pStmt);
  if( rc==SQLITE_OK ) rc = rc2;

  if( zErr ){
    sqlite3_result_error(pCtx, zErr, -1);
    sqlite3_free(zErr);
  }else if( rc ){
    sqlite3_result_error_code(pCtx, rc);
  }else{
    if( p->encryptionKey==0 ){
      p->encryptionType = 0;
    }
  }
  return rc;
}

/*
** Check that there is room in buffer pBuf for at least nByte bytes more 
** data. If not, attempt to allocate more space. If the allocation attempt
** fails, leave an error message in context pCtx and return SQLITE_ERROR.
**
** If no error occurs, SQLITE_OK is returned.
*/
static int zonefileBufferGrow(
  sqlite3_context *pCtx, 
  ZonefileBuffer *pBuf, 
  int nByte
){
  int nReq = pBuf->n + nByte;
  if( nReq>pBuf->nAlloc ){
    u8 *aNew;
    int nNew = pBuf->nAlloc ? pBuf->nAlloc*2 : 128;
    while( nNew<nReq ) nNew = nNew*2;
    aNew = sqlite3_realloc(pBuf->a, nNew);
    if( aNew==0 ){
      sqlite3_result_error_nomem(pCtx);
      return SQLITE_ERROR;
    }
    pBuf->a = aNew;
    pBuf->nAlloc = nNew;
  }
  return SQLITE_OK;
}

/*
** Free the memory allocation associated with buffer pBuf.
*/
static void zonefileBufferFree(ZonefileBuffer *pBuf){
  sqlite3_free(pBuf->a);
  memset(pBuf, 0, sizeof(ZonefileBuffer));
}

/*
** Read and return a 64-bit unsigned integer in big-endian format from 
** buffer aBuf.
*/
static u64 zonefileGet64(u8 *aBuf){
  return (((u64)aBuf[0]) << 56)
       + (((u64)aBuf[1]) << 48)
       + (((u64)aBuf[2]) << 40)
       + (((u64)aBuf[3]) << 32) 
       + (((u64)aBuf[4]) << 24)
       + (((u64)aBuf[5]) << 16)
       + (((u64)aBuf[6]) <<  8)
       + (((u64)aBuf[7]) <<  0);
}

/*
** Append a 32-bit big-endian integer with value v to buffer pBuf. Space
** must have already been reserved in the buffer using zonefileBufferGrow().
*/
static void zonefileAppend32(ZonefileBuffer *pBuf, u32 v){
  zonefilePut32(&pBuf->a[pBuf->n], v);
  pBuf->n += 4;
}

/*
** Append a 64-bit big-endian integer with value v to buffer pBuf. Space
** must have already been reserved in the buffer using zonefileBufferGrow().
*/
static void zonefileAppend64(ZonefileBuffer *pBuf, u64 v){
  zonefileAppend32(pBuf, v>>32);
  zonefileAppend32(pBuf, v & 0xFFFFFFFF);
}

/*
** Append the n bytse of data in buffer p to buffer pBuf. Space must have
** already been reserved in the buffer using zonefileBufferGrow().
*/
static void zonefileAppendBlob(ZonefileBuffer *pBuf, const u8 *p, int n){
  memcpy(&pBuf->a[pBuf->n], p, n);
  pBuf->n += n;
}

/*
** Write nBuf bytes of data from buffer aBuf to the file opened by 
** file-handle pFd. Return SQLITE_OK if successful, or SQLITE_ERROR
** otherwise.
*/
static int zonefileFileWrite(FILE *pFd, const u8 *aBuf, int nBuf){
  size_t res = fwrite(aBuf, 1, nBuf, pFd);
  return res!=(size_t)nBuf ? SQLITE_ERROR : SQLITE_OK;
}

/*
** Read nBuf bytes of data from offset iOff of the file opened by 
** file-handle pFd into buffer aBuf. Return SQLITE_OK if successful, or
** SQLITE_ERROR otherwise.
*/
static int zonefileFileRead(FILE *pFd, u8 *aBuf, int nBuf, i64 iOff){
  int rc = fseek(pFd, (long)iOff, SEEK_SET);
  if( rc==0 ){
    rc = fread(aBuf, 1, nBuf, pFd);
    rc = (rc==nBuf) ? SQLITE_OK : SQLITE_ERROR;
  }else{
    rc = SQLITE_ERROR;
  }
  return rc;
}

/*
** Open the file identified by path zFile for writing (if bWrite==1) or
** reading (if bWrite==0). If successful, return a pointer to the new
** file-handle object. Otherwise, return NULL and set output variable
** (*pzErr) to point to a buffer containing an English language error
** message. It is the responsibility of the caller to eventually free
** any error message buffer using sqlite3_free().
*/
static FILE *zonefileFileOpen(const char *zFile, int bWrite, char **pzErr){
  FILE *pFd = fopen(zFile, bWrite ? "wb" : "rb");
  if( pFd==0 ){
    *pzErr = sqlite3_mprintf("failed to open file \"%s\" for %s",
        zFile, bWrite ? "writing" : "reading"
    );
  }
  return pFd;
}

/*
** Close the file handle passed as the only argument.
*/
static void zonefileFileClose(FILE *pFd){
  if( pFd ) fclose(pFd);
}

/*
** Append the contents of buffer pFrom to buffer pTo. If successful, return
** SQLITE_OK. Otherwise, return an SQLite error code and leave an error
** message in context object pCtx.
**
** If argument pMethod is not NULL, then it is used along with pCmp to 
** compress the data before appending it to pFrom. Similarly, if argument
** pCodec is not NULL, then it is used to encrypt the data before it is
** appended.
*/
static int zonefileAppendData(
  sqlite3_context *pCtx,          /* Leave any error message here */
  ZonefileCompress *pMethod,      /* Compression method object */
  void *pCmp,                     /* Compression handle */
  ZonefileCodec *pCodec,          /* Compression method, if any */
  ZonefileBuffer *pTo,            /* Append new data here */
  ZonefileBuffer *pFrom           /* Input buffer */
){
  int rc = SQLITE_OK;
  int nNonce = pCodec ? zonefileCodecNonceSize(pCodec) : 0;
  int nOrig = pTo->n;
  if( pMethod->eType==ZONEFILE_COMPRESSION_NONE ){
    if( zonefileBufferGrow(pCtx, pTo, pFrom->n + nNonce) ){
      rc = SQLITE_ERROR;
    }else{
      zonefileAppendBlob(pTo, pFrom->a, pFrom->n);
    }
  }else{
    int nReq = pMethod->xCompressBound(pCmp, pFrom->n);
    if( zonefileBufferGrow(pCtx, pTo, nReq + nNonce) ) return SQLITE_ERROR;
    rc = pMethod->xCompress(pCmp, &pTo->a[pTo->n], &nReq, pFrom->a, pFrom->n);
    pTo->n += nReq;
  }

  /* Encrypt the data just appended to buffer pTo. */
  if( rc==SQLITE_OK && pCodec ){
    zonefileCodecEncode(pCodec, &pTo->a[nOrig], pTo->n - nOrig);
    pTo->n += nNonce;
  }
  return rc;
}

/*
** Append nByte bytes of garbage data to the file opened with pFd. Return
** SQLITE_OK if successful, or SQLITE_ERROR if an error occurs.
**
** Parameter nByte is only ever non-zero when running tests. So it doesn't
** matter if this function is inefficient in those cases.
*/
static int zonefilePad(FILE *pFd, int nByte){
  assert( nByte>=0 && nByte<256 );
  if( nByte ){
    int nRem = nByte;
    u8 buf[17] = "0123456789ABCDEF";
    while( nRem>0 ){
      int n = MIN(nRem, sizeof(buf));
      if( zonefileFileWrite(pFd, buf, n) ) return SQLITE_ERROR;
      nRem -= n;
    }
  }
  return SQLITE_OK;
}

/*
** If character c is not a hexadecimal digit, return -1. Otherwise, return
** the value of the hex digit (a value between 0 and 15).
*/
static int zonefileHexChar(char c){
  if( c>='0' && c<='9' ) return c-'0';
  c = c & ~0x20;
  if( c>='A' && c<='F' ) return c-('A'-10);
  return -1;
}

/*
** String ZonefileParam.encryptionKey currently contains a string specified
** for the encryptionKey attribute of a JSON object passed to SQL function
** zonefile_write(). The string is (*pn) bytes in size.
**
** If the ZonefileParam.debugEncryptionKeyText flag is true this function
** is a no-op. Otherwise, an attempt is made to overwrite the hex string in
** ZonefileParam.encryptionKey with the corresponding binary data. If
** successful, SQLITE_OK is returned and (*pn) is set to the number of
** bytes in the binary key. Otherwise, if an error occurs, an SQLite error
** code is returned and (*pzErr) set to point to an English language error
** message. It is the responsibility of the caller to eventually free any
** error message buffer using sqlite3_free().
*/
static int zonefileDecodeEncryptionKey(ZonefileParam *p, int *pn, char **pzErr){
  if( p->debugEncryptionKeyText==0 ){
    u8 *z = (u8*)p->encryptionKey;
    int n = *pn;
    int i;
    if( n&0x01 ) goto bad_format;
    for(i=0; i<n; i+=2){
      int a = zonefileHexChar(z[i]);
      int b = zonefileHexChar(z[i+1]);
      if( a<0 || b<0 ) goto bad_format;
      z[i/2] = (u8)(a<<4) + (u8)b;
    }
    *pn = n/2;
  }
  return SQLITE_OK;

 bad_format:
  *pzErr = sqlite3_mprintf("badly formatted hex string");
  return SQLITE_ERROR;
}

/*
** Function:     zonefile_write(F,T[,J])
*/
static void zonefileWriteFunc(
  sqlite3_context *pCtx,       /* Context object */
  int objc,                       /* Number of SQL arguments */
  sqlite3_value **objv            /* Array of SQL arguments */
){
  const char *zFile = 0;          /* File to write to */
  const char *zTbl = 0;           /* Database object to read from */
  const char *zJson = 0;          /* JSON configuration parameters */
  ZonefileParam sParam;           /* Decoded JSON parameters */
  int nKey = 0;                   /* Number of keys in new zonefile */
  int nFrame = 0;                 /* Number of frames in new zonefile */
  sqlite3_stmt *pStmt = 0;        /* SQL used to read data from source table */
  FILE *pFd = 0;
  int rc = SQLITE_OK;
  sqlite3_value *pPrev = 0;
  char *zErr = 0;
  void *pCmp = 0;                 /* Data compressor handle */
  u32 iOff;
  ZonefileCodec *pCodec = 0;

  ZonefileBuffer sFrameIdx = {0, 0, 0};     /* Array of frame offsets */
  ZonefileBuffer sKeyIdx = {0, 0, 0};       /* Array of key locations */
  ZonefileBuffer sData = {0, 0, 0};         /* All completed frames so far */
  ZonefileBuffer sFrame = {0, 0, 0};        /* Current frame (uncompressed) */
  ZonefileBuffer sDict = {0, 0, 0};         /* Compression model (if any) */
  ZonefileBuffer sSample = {0,0,0};         /* Sample data for compressor */
  size_t *aSample = 0;                      /* Array of sample sizes */

  u8 aHdr[ZONEFILE_SZ_HEADER];    /* Space to assemble zonefile header */

  assert( objc==2 || objc==3 );
  zFile = (const char*)sqlite3_value_text(objv[0]);
  zTbl = (const char*)sqlite3_value_text(objv[1]);
  if( objc==3 ){
    zJson = (const char*)sqlite3_value_text(objv[2]);
  }
  if( zonefileGetParams(pCtx, zJson, &sParam) ) return;

  if( sParam.encryptionType!=0 ){
    int n = strlen(sParam.encryptionKey);
    rc = zonefileDecodeEncryptionKey(&sParam, &n, &zErr);
    if( rc==SQLITE_OK ){
      rc = zonefileCodecCreate(sParam.encryptionType, 
          1, (u8*)sParam.encryptionKey, n, &pCodec, &zErr
      );
    }
    if( rc!=SQLITE_OK ){
      if( zErr ){
        sqlite3_result_error(pCtx, zErr, -1);
      }else{
        sqlite3_result_error_code(pCtx, rc);
      }
      sqlite3_free(zErr);
      goto zone_write_out;
    }
  }

  /* Check that the index-data compressor is not one that uses an external
  ** dictionary. This is not permitted as there is no sense in using a
  ** dictionary to compress a single blob of data, and the index-data
  ** compressor only ever compresses a single frame. Also, there is nowhere
  ** in the file-format to store such a dictionary for the index-data.  */
  if( sParam.pCmpIdx->xTrain ){
    zonefileCtxError(pCtx, 
        "compressor \"%s\" may not be used to compress the zonefile index", 
        sParam.pCmpIdx->zName
    );
    goto zone_write_out;
  }

  if( sParam.pCmpData->xOpen ){
    rc = sParam.pCmpData->xOpen(&pCmp, 0, 0);
    if( rc!=SQLITE_OK ){
      zonefileCtxError(pCtx, "error in compressor construction");
      goto zone_write_out;
    }
  }

  /* Prepare the SQL statement used to read data from the source table. This
  ** also serves to verify the suitability of the source table schema. */
  rc = zonefilePrepare(sqlite3_context_db_handle(pCtx), &pStmt, &zErr,
      "SELECT k, frame, v FROM %Q ORDER BY frame, idx, k", zTbl
  );

  /* Open the file-handle used to write out the zonefile */ 
  if( rc==SQLITE_OK ){
    pFd = zonefileFileOpen(zFile, 1, &zErr);
  }
  if( pFd==0 ){
    sqlite3_result_error(pCtx, zErr, -1);
    sqlite3_free(zErr);
    goto zone_write_out;
  }

  /* If the data compressor uses a global dictionary, create the dictionary
  ** and store it in buffer sDict.  */
  if( sParam.pCmpData->xTrain ){
    int nSample = 0;

    while( SQLITE_ROW==sqlite3_step(pStmt) ){
      int nByte = sqlite3_column_bytes(pStmt, 2);
      const u8 *aByte = (const u8*)sqlite3_column_blob(pStmt, 2);
      if( zonefileBufferGrow(pCtx, &sSample, nByte) ){
        goto zone_write_out;
      }
      if( (nSample & (nSample-1))==0 ){
        int nNew = nSample ? nSample*2 : 8;
        size_t *aNew = (size_t*)sqlite3_realloc(aSample, sizeof(size_t) * nNew);
        if( aNew==0 ){
          sqlite3_result_error_nomem(pCtx);
          goto zone_write_out;
        }
        aSample = aNew;
      }
      aSample[nSample] = nByte;
      zonefileAppendBlob(&sSample, aByte, nByte);
      nSample++;
    }
    rc = sqlite3_reset(pStmt);
    if( rc!=SQLITE_OK ){
      zonefileTransferError(pCtx);
      goto zone_write_out;
    }

    if( zonefileBufferGrow(pCtx, &sDict, ZONEFILE_DEFAULT_DICTSIZE) ){
      goto zone_write_out;
    }
    sDict.n = sDict.nAlloc;

    rc = sParam.pCmpData->xTrain(
        pCmp, sDict.a, &sDict.n, sSample.a, aSample, nSample
    );
    if( rc!=SQLITE_OK ){
      zonefileCtxError(pCtx, "error generating dictionary");
      goto zone_write_out;
    }
  }

  while( SQLITE_ROW==sqlite3_step(pStmt) ){
    sqlite3_int64 k = sqlite3_column_int64(pStmt, 0);
    sqlite3_value *pFrame = sqlite3_column_value(pStmt, 1);
    int nBlob = sqlite3_column_bytes(pStmt, 2);
    const u8 *pBlob = (const u8*)sqlite3_column_blob(pStmt, 2);

    int bAuto = zonefileIsAutoFrame(pFrame);
    if( sFrame.n>0 ){
      if( zonefileCompareValue(pFrame, pPrev) 
       || (bAuto && (sFrame.n+nBlob)>sParam.maxAutoFrameSize)
      ){
        /* Add new entry to sFrame */
        if( zonefileBufferGrow(pCtx, &sFrameIdx, 4) 
         || zonefileAppendData(pCtx,sParam.pCmpData,pCmp,pCodec,&sData,&sFrame)
        ){
          goto zone_write_out;
        }
        sFrame.n = 0;
        zonefileAppend32(&sFrameIdx, sData.n);
        sqlite3_value_free(pPrev);
        pPrev = 0;
        nFrame++;
      }
    }

    if( pPrev==0 ){
      pPrev = sqlite3_value_dup(pFrame);
      if( pPrev==0 ){
        sqlite3_result_error_nomem(pCtx);
        goto zone_write_out;
      }
    }

    /* Add new entry to sKeyIdx */
    if( zonefileBufferGrow(pCtx, &sKeyIdx, ZONEFILE_SZ_KEYOFFSETS_ENTRY) ){
      goto zone_write_out;
    }
    zonefileAppend64(&sKeyIdx, k);
    zonefileAppend32(&sKeyIdx, nFrame);
    zonefileAppend32(&sKeyIdx, sFrame.n);
    zonefileAppend32(&sKeyIdx, nBlob);

    /* Add uncompressed data for new entry to sFrame */
    if( zonefileBufferGrow(pCtx, &sFrame, nBlob) ) goto zone_write_out;
    zonefileAppendBlob(&sFrame, pBlob, nBlob);
    nKey++;
  }

  if( sFrame.n>0 ){
    if( zonefileBufferGrow(pCtx, &sFrameIdx, 4) 
     || zonefileAppendData(pCtx, sParam.pCmpData, pCmp, pCodec, &sData, &sFrame)
    ){
      goto zone_write_out;
    }
    zonefileAppend32(&sFrameIdx, sData.n);
    nFrame++;
  }

  /* If a compression method was specified, compress the key-index here */
  if( sParam.pCmpIdx->eType!=ZONEFILE_COMPRESSION_NONE ){
    if( zonefileBufferGrow(pCtx, &sFrameIdx, sKeyIdx.n) ) goto zone_write_out;
    zonefileAppendBlob(&sFrameIdx, sKeyIdx.a, sKeyIdx.n);
    zonefileBufferFree(&sKeyIdx);
    rc = zonefileAppendData(pCtx, sParam.pCmpIdx, 0, 0, &sKeyIdx, &sFrameIdx);
    sFrameIdx.n = 0;
    if( rc ) goto zone_write_out;
  }

  /* Create the zonefile header in the in-memory buffer */
  memset(aHdr, 0, ZONEFILE_SZ_HEADER);
  zonefilePut32(&aHdr[0], ZONEFILE_MAGIC_NUMBER);
  aHdr[4] = (u8)sParam.pCmpIdx->eType;
  aHdr[5] = (u8)sParam.pCmpData->eType;
  iOff = ZONEFILE_SZ_HEADER + sFrameIdx.n + sKeyIdx.n;
  zonefilePut32(&aHdr[6], sDict.n ? iOff+sParam.debugExtendedHeaderSize : 0);
  zonefilePut32(&aHdr[10], iOff + sParam.debugExtendedHeaderSize + sDict.n);
  zonefilePut32(&aHdr[14], nFrame);
  zonefilePut32(&aHdr[18], nKey);
  aHdr[22] = (u8)sParam.encryptionType;
  aHdr[23] = 0;                   /* Encryption key index */
  aHdr[24] = 0;                   /* extended header version */
  aHdr[25] = (u8)sParam.debugExtendedHeaderSize;
  assert( ZONEFILE_SZ_HEADER>=26 );

  rc = zonefileFileWrite(pFd, aHdr, ZONEFILE_SZ_HEADER);
  if( rc==SQLITE_OK ) rc = zonefilePad(pFd, sParam.debugExtendedHeaderSize);
  if( rc==SQLITE_OK ) rc = zonefileFileWrite(pFd, sFrameIdx.a, sFrameIdx.n);
  if( rc==SQLITE_OK ) rc = zonefileFileWrite(pFd, sKeyIdx.a, sKeyIdx.n);
  if( rc==SQLITE_OK ) rc = zonefileFileWrite(pFd, sDict.a, sDict.n);
  if( rc==SQLITE_OK ) rc = zonefileFileWrite(pFd, sData.a, sData.n);
  if( rc ){
    zonefileCtxError(pCtx, "error writing file \"%s\" (fwrite())", zFile);
    goto zone_write_out;
  }

  if( fclose(pFd) ){
    zonefileCtxError(pCtx, "error writing file \"%s\" (fclose())", zFile);
  }
  pFd = 0;

 zone_write_out:
  if( pCmp ) sParam.pCmpData->xClose(pCmp);
  if( pFd ) fclose(pFd);
  sqlite3_value_free(pPrev);
  sqlite3_finalize(pStmt);
  zonefileCodecDestroy(pCodec);
  zonefileBufferFree(&sFrameIdx);
  zonefileBufferFree(&sKeyIdx);
  zonefileBufferFree(&sFrame);
  zonefileBufferFree(&sDict);
  zonefileBufferFree(&sData);
  zonefileBufferFree(&sSample);
  sqlite3_free(aSample);
  sqlite3_free(sParam.encryptionKey);
  if( rc==SQLITE_NOMEM ){
    sqlite3_result_error_nomem(pCtx);
  }
}

/*
** Virtual table type for zonefile_files virtual tables.
*/
typedef struct ZonefileFilesTab ZonefileFilesTab;
struct ZonefileFilesTab {
  sqlite3_vtab base;              /* Base class - must be first */
  sqlite3 *db;
  char *zBase;                    /* Name of this table */
  char *zDb;                      /* Database containing this table */
  ZonefileGlobal *pGlobal;        /* Global object */
  sqlite3_stmt *pInsert;          /* Insert into the %_shadow_file table */
  sqlite3_stmt *pInsertIdx;       /* Insert into the %_shadow_idx table */
  sqlite3_stmt *pDeleteIdx;       /* Delete by fileid from %_shadow_idx table */
  sqlite3_stmt *pDelete;          /* Delete by rowid from %_shadow_file table */
};

/*
** Virtual table cursor type for zonefile_files virtual tables.
*/
typedef struct ZonefileFilesCsr ZonefileFilesCsr;
struct ZonefileFilesCsr {
  sqlite3_vtab_cursor base;       /* Base class - must be first */
  sqlite3_stmt *pSelect;
};

/*
** This function does the work of xCreate (if bCreate!=0) or xConnect
** (if bCreate==0) for the zonefile_files module.
*/
static int zffCreateConnect(
  int bCreate,
  void *pAux,
  sqlite3 *db,
  int argc, const char *const*argv,
  sqlite3_vtab **ppVtab,
  char **pzErr
){
  ZonefileFilesTab *p;
  const char *zName = argv[2];
  const char *zDb = argv[1];
  int nName = strlen(zName);
  int nDb = strlen(zDb);
  int rc = SQLITE_OK;

  if( nName<6 || memcmp(&zName[nName-6], "_files", 6)!=0 ){
    *pzErr = sqlite3_mprintf("do not create zonefile_files tables directly!");
    *ppVtab = 0;
    return SQLITE_ERROR;
  }

  p = (ZonefileFilesTab*)sqlite3_malloc(sizeof(ZonefileFilesTab)+nName+1+nDb+1);
  if( !p ){
    rc = SQLITE_NOMEM;
  }else{
    memset(p, 0, sizeof(ZonefileFilesTab));
    p->zBase = (char*)&p[1];
    memcpy(p->zBase, zName, nName-6);
    p->zBase[nName-6] = '\0';
    p->zDb = &p->zBase[nName+1];
    memcpy(p->zDb, zDb, nDb+1);
    p->db = db;
    p->pGlobal = (ZonefileGlobal*)pAux;
    rc = sqlite3_declare_vtab(db, ZONEFILE_FILES_SCHEMA);
  }

  if( rc!=SQLITE_OK ){
    sqlite3_free(p);
    p = 0;
  }
  *ppVtab = (sqlite3_vtab*)p;
  return rc;
}

/* 
** zonefile_files virtual table module xCreate method.
*/
static int zffCreate(
  sqlite3 *db,
  void *pAux,
  int argc, const char *const*argv,
  sqlite3_vtab **ppVtab,
  char **pzErr
){
  return zffCreateConnect(1, pAux, db, argc, argv, ppVtab, pzErr);
}

/* 
** zonefile_files virtual table module xConnect method.
*/
static int zffConnect(
  sqlite3 *db,
  void *pAux,
  int argc, const char *const*argv,
  sqlite3_vtab **ppVtab,
  char **pzErr
){
  return zffCreateConnect(0, pAux, db, argc, argv, ppVtab, pzErr);
}

/* 
** zonefile_files virtual table module xDisconnect method.
*/
static int zffDisconnect(sqlite3_vtab *pVtab){
  ZonefileFilesTab *pTab = (ZonefileFilesTab*)pVtab;
  sqlite3_finalize(pTab->pInsert);
  sqlite3_finalize(pTab->pDelete);
  sqlite3_finalize(pTab->pInsertIdx);
  sqlite3_finalize(pTab->pDeleteIdx);
  sqlite3_free(pTab);
  return SQLITE_OK;
}

/* 
** zonefile_files virtual table module xBestIndex method.
*/
static int zffBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pInfo){
  return SQLITE_OK;
}

/* 
** zonefile_files virtual table module xOpen method.
*/
static int zffOpen(sqlite3_vtab *pVtab, sqlite3_vtab_cursor **ppCursor){
  ZonefileFilesCsr *pCsr;
  pCsr = (ZonefileFilesCsr*)sqlite3_malloc(sizeof(ZonefileFilesCsr));
  if( pCsr==0 ){
    return SQLITE_NOMEM;
  }
  memset(pCsr, 0, sizeof(ZonefileFilesCsr));
  *ppCursor = (sqlite3_vtab_cursor*)pCsr;
  return SQLITE_OK;
}

/* 
** Reset a ZonefileFilesCsr object to the state it is in immediately after
** it is allocated by zffOpen().
*/
static void zffCursorReset(ZonefileFilesCsr *pCsr){
  sqlite3_finalize(pCsr->pSelect);
  pCsr->pSelect = 0;
}

/* 
** zonefile_files virtual table module xClose method.
*/
static int zffClose(sqlite3_vtab_cursor *cur){
  ZonefileFilesCsr *pCsr = (ZonefileFilesCsr*)cur;
  zffCursorReset(pCsr);
  sqlite3_free(pCsr);
  return SQLITE_OK;
}

/* 
** zonefile_files virtual table module xNext method.
*/
static int zffNext(sqlite3_vtab_cursor *cur){
  ZonefileFilesCsr *pCsr = (ZonefileFilesCsr*)cur;
  int rc;
  if( SQLITE_ROW==sqlite3_step(pCsr->pSelect) ){
    rc = SQLITE_OK;
  }else{
    rc = sqlite3_finalize(pCsr->pSelect);
    pCsr->pSelect = 0;
  }
  return rc;
}

/* 
** zonefile_files virtual table module xFilter method.
*/
static int zffFilter(
  sqlite3_vtab_cursor *cur, 
  int idxNum, const char *idxStr,
  int argc, sqlite3_value **argv
){
  ZonefileFilesCsr *pCsr = (ZonefileFilesCsr*)cur;
  ZonefileFilesTab *pTab = (ZonefileFilesTab*)(pCsr->base.pVtab);
  int rc;
  zffCursorReset(pCsr);

  rc = zonefilePrepare(pTab->db, &pCsr->pSelect, &pTab->base.zErrMsg,
      "SELECT filename, fileid FROM %Q.'%q_shadow_file'",
      pTab->zDb, pTab->zBase
  );
  if( rc==SQLITE_OK ){
    rc = zffNext(cur);
  }
  return rc;
}

/*
** zonefile_files virtual table module xEof method.
*/
static int zffEof(sqlite3_vtab_cursor *cur){
  ZonefileFilesCsr *pCsr = (ZonefileFilesCsr*)cur;
  return pCsr->pSelect==0;
}

/*
** Deserialize the ZONEFILE_SZ_HEADER byte zonefile header in the
** buffer. Populate (*pHdr) with the results.
*/
static void zonefileHeaderDeserialize(u8 *aBuf, ZonefileHeader *pHdr){
  pHdr->magicNumber = zonefileGet32(&aBuf[0]);
  pHdr->compressionTypeIndexData = aBuf[4];
  pHdr->compressionTypeContent = aBuf[5];
  pHdr->byteOffsetDictionary = zonefileGet32(&aBuf[6]);
  pHdr->byteOffsetFrames = zonefileGet32(&aBuf[10]);
  pHdr->numFrames = zonefileGet32(&aBuf[14]);
  pHdr->numKeys = zonefileGet32(&aBuf[18]);
  pHdr->encryptionType = aBuf[22];
  pHdr->encryptionKeyIdx = aBuf[23];
  pHdr->extendedHeaderVersion = aBuf[24];
  pHdr->extendedHeaderSize = aBuf[25];
}

/*
** Read and decode a Zonefile header from the start of the file opened
** by file-handle pFd. If successful, populate object (*pHdr) before
** returning SQLITE_OK. Otherwise, if an error occurs, set output
** parameter (*pzErr) to point to an English language error message and
** return an SQLite error code.
**
** It is the responsibility of the caller to eventually free any error
** message returned via (*pzErr) using sqlite3_free().
*/
static int zonefileReadHeader(
  FILE *pFd,                      /* File to read from */
  const char *zFile,              /* Name of file opened by pFd */
  ZonefileHeader *pHdr,           /* Populate this object before returning */
  char **pzErr                    /* OUT: Error message */
){
  u8 aBuf[ZONEFILE_SZ_HEADER];
  int rc = zonefileFileRead(pFd, aBuf, ZONEFILE_SZ_HEADER, 0);
  if( rc==SQLITE_OK ){
    zonefileHeaderDeserialize(aBuf, pHdr);
    if( pHdr->magicNumber!=ZONEFILE_MAGIC_NUMBER ){
      rc = SQLITE_ERROR;
    }
  }

  if( rc!=SQLITE_OK ){
    *pzErr = sqlite3_mprintf(
        "failed to read zonefile header from file \"%s\"", zFile
    );
  }

  return rc;
}

/*
** Read the zonefile header from file zFile and set the result of pCtx
** to a JSON object that represents the contents. Or, if an error occurs,
** leave an error message in pCtx. This function is called whenever the
** "header" column of a zonefile_files virtual table is requested.
*/
static void zonefileJsonHeader(sqlite3_context *pCtx, const char *zFile){
  char *zErr = 0;
  int rc = SQLITE_OK;
  ZonefileHeader hdr = {0};

  FILE *pFd = zonefileFileOpen(zFile, 0, &zErr);
  if( pFd ){
    rc = zonefileReadHeader(pFd, zFile, &hdr, &zErr);
  }else{
    rc = SQLITE_ERROR;
  }

  if( rc==SQLITE_OK ){
    char *zJson = sqlite3_mprintf("{"
        "\"magicNumber\":%u,"
        "\"compressionTypeIndexData\":%u,"
        "\"compressionTypeContent\":%u,"
        "\"byteOffsetDictionary\":%u,"
        "\"byteOffsetFrames\":%u,"
        "\"numFrames\":%u,"
        "\"numKeys\":%u,"
        "\"encryptionType\":%u,"
        "\"encryptionKeyIdx\":%u,"
        "\"extendedHeaderVersion\":%u,"
        "\"extendedHeaderSize\":%u}",
        (u32)hdr.magicNumber,
        (u32)hdr.compressionTypeIndexData,
        (u32)hdr.compressionTypeContent,
        (u32)hdr.byteOffsetDictionary,
        (u32)hdr.byteOffsetFrames,
        (u32)hdr.numFrames,
        (u32)hdr.numKeys,
        (u32)hdr.encryptionType,
        (u32)hdr.encryptionKeyIdx,
        (u32)hdr.extendedHeaderVersion,
        (u32)hdr.extendedHeaderSize
          );
    if( zJson ){
      sqlite3_result_text(pCtx, zJson, -1, SQLITE_TRANSIENT);
      sqlite3_free(zJson);
    }else{
      sqlite3_result_error_nomem(pCtx);
    }
  }else{
    sqlite3_result_error(pCtx, zErr, -1);
    sqlite3_free(zErr);
  }

  zonefileFileClose(pFd);
}

/* 
** zonefile_files virtual table module xColumn method.
*/
static int zffColumn(sqlite3_vtab_cursor *cur, sqlite3_context *ctx, int i){
  ZonefileFilesCsr *pCsr = (ZonefileFilesCsr*)cur;
  if( sqlite3_vtab_nochange(ctx) ){
    return SQLITE_OK;
  }
  switch( i ){
    case 0: /* filename */
      sqlite3_result_value(ctx, sqlite3_column_value(pCsr->pSelect, 0));
      break;
    case 1: /* ekey */
      break;
    default: {
      const char *zFile = (const char*)sqlite3_column_text(pCsr->pSelect, 0);
      zonefileJsonHeader(ctx, zFile);
      assert( i==2 );
      break;
    }
  }
  return SQLITE_OK;
}

/* 
** zonefile_files virtual table module xRowid method.
*/
static int zffRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
  ZonefileFilesCsr *pCsr = (ZonefileFilesCsr*)cur;
  *pRowid = sqlite3_column_int64(pCsr->pSelect, 1);
  return SQLITE_OK;
}

/*
** Uncompress buffer aIn/nIn using the compression routines pMethod
** and the compressor instance pCmp into space obtained from 
** sqlite3_malloc(). If successful, return SQLITE_OK and set output
** parameters (*paOut) and (*pnOut) to point to the allocated buffer
** and its size in bytes respectively. In this case it is the 
** responsibility of the caller to eventually free buffer (*paOut)
** using sqlite3_free().
**
** Or, if an error occurs, set both output parameters to zero and
** return an SQLite error code.
*/
static int zonefileUncompress(
  ZonefileCompress *pMethod,      /* Compression routines */
  void *pCmp,                     /* Compressor instance */
  u8 *aIn, int nIn,               /* Input buffer */
  u8 **paOut, int *pnOut          /* Output buffer */
){
  int rc;
  int nOut = pMethod->xUncompressSize(pCmp, aIn, nIn);
  u8 *aOut = sqlite3_malloc(nOut);

  assert( pMethod->eType!=ZONEFILE_COMPRESSION_NONE );
  if( aOut==0 ){
    rc = SQLITE_NOMEM;
  }else{
    rc = pMethod->xUncompress(pCmp, aOut, nOut, aIn, nIn);
  }
  if( rc ){
    sqlite3_free(aOut);
    aOut = 0;
  }

  *paOut = aOut;
  *pnOut = nOut;
  return rc;
}

/*
** Attempt to find the compression methods object for the compression method
** identified by integer constant eType (defined as part of the zonefile file
** format). If successful, set output parameter (*pp) to point to the object
** and return SQLITE_OK. Otherwise, return an SQLite error code and set
** (*pzErr) to point to a buffer containing an English language error
** message. It is the responsibility of the caller to eventually free any
** error message buffer using sqlite3_free().
*/
static int zonefileFindCompress(int eType, ZonefileCompress **pp, char **pzErr){
  int rc = SQLITE_OK;
  ZonefileCompress *pCmp;
  pCmp = zonefileCompressByValue(eType);
  if( pCmp==0 ){
    *pzErr = sqlite3_mprintf("unsupported compression method: %d", eType);
    rc = SQLITE_ERROR;
  }else if( pCmp->eType==ZONEFILE_COMPRESSION_NONE ){
    pCmp = 0;
  }
  *pp = pCmp;
  return rc;
}

/*
** Argument pHdr points to a deserialized zonefile header read from the
** zonefile opened by file handle pFd. This function attempts to read
** the entire zonefile-index structure into space obtained from 
** sqlite3_malloc(). If successful, it sets output parameters (*paIdx)
** and (*pnIdx) to point to the buffer and its size in bytes respectively
** before returning SQLITE_OK.
**
** Otherwise, if an error occurs, an SQLite error code is returned and
** output parameter (*pzErr) may be set to point to a buffer containing an
** English language error message. It is the responsibility of the caller to
** eventually free any error message buffer using sqlite3_free().
*/
static int zonefileLoadIndex(
  ZonefileHeader *pHdr,           /* Deserialized header read from file */
  FILE *pFd,                      /* File to read from */
  u8 **paIdx, int *pnIdx,         /* OUT: Buffer containing zonefile index */
  char **pzErr                    /* OUT: Error message */
){
  ZonefileCompress *pCmp = 0;
  int rc;
  u8 *aIdx = 0;
  int nIdx = 0;
    
  rc = zonefileFindCompress(pHdr->compressionTypeIndexData, &pCmp, pzErr);
  if( rc==SQLITE_OK ){
    if( pHdr->byteOffsetDictionary ){
      nIdx = pHdr->byteOffsetDictionary - ZONEFILE_SZ_HEADER;
    }else{
      nIdx = pHdr->byteOffsetFrames - ZONEFILE_SZ_HEADER;
    }
    nIdx -= pHdr->extendedHeaderSize;
    aIdx = (u8*)sqlite3_malloc(nIdx);

    if( aIdx==0 ){
      rc = SQLITE_NOMEM;
    }else{
      i64 iOff = ZONEFILE_SZ_HEADER + pHdr->extendedHeaderSize;
      rc = zonefileFileRead(pFd, aIdx, nIdx, iOff);
    }
  }

  if( rc==SQLITE_OK && pCmp ){
    u8 *aUn = 0;
    int nUn = 0;
    rc = zonefileUncompress(pCmp, 0, aIdx, nIdx, &aUn, &nUn);
    if( rc==SQLITE_ERROR ){
      *pzErr = sqlite3_mprintf("failed to uncompress index");
    }
    sqlite3_free(aIdx);
    aIdx = aUn;
    nIdx = nUn;
  }

  if( rc!=SQLITE_OK ){
    sqlite3_free(aIdx);
    aIdx = 0;
    nIdx = 0;
  }

  *paIdx = aIdx;
  *pnIdx = nIdx;
  return rc;
}


static int zonefilePopulateIndex(
  ZonefileFilesTab *pTab,
  const char *zFile,
  i64 iFileid
){
  ZonefileHeader hdr = { 0 };
  int rc;
  FILE *pFd = zonefileFileOpen(zFile, 0, &pTab->base.zErrMsg);

  if( pFd==0 ){
    rc = SQLITE_ERROR;
  }else{
    rc = zonefileReadHeader(pFd, zFile, &hdr, &pTab->base.zErrMsg);
  }

  if( rc==SQLITE_OK && hdr.numKeys>0 ){
    u8 *aKey;                     /* Entire KeyOffsets array */
    int nKey;                     /* Size of buffer aKey[] in bytes */
    int i;

    rc = zonefileLoadIndex(&hdr, pFd, &aKey, &nKey, &pTab->base.zErrMsg);

    if( rc==SQLITE_OK && pTab->pInsertIdx==0 ){
      rc = zonefilePrepare(pTab->db, &pTab->pInsertIdx, &pTab->base.zErrMsg,
          "INSERT INTO %Q.'%q_shadow_idx'(k, fileid, fofst, fsz, ofst, sz)"
          "VALUES(?,?,?,?,?,?)",
          pTab->zDb, pTab->zBase
      );
    }

    for(i=0; (u32)i<hdr.numKeys && rc==SQLITE_OK; i++){
      u8 *aEntry = &aKey[4*hdr.numFrames + ZONEFILE_SZ_KEYOFFSETS_ENTRY * i];
      int iFrame = zonefileGet32(&aEntry[8]);
      i64 iFrameOff = 0;          /* Offset of frame */
      int szFrame;                /* Compressed size of frame */
      i64 iOff;                   /* Offset of blob within uncompressed frame */
      int sz;                     /* Size of blob within uncompressed frame */

      szFrame = zonefileGet32(&aKey[iFrame*4]);
      if( iFrame>0 ){
        iFrameOff = zonefileGet32(&aKey[(iFrame-1)*4]);
        szFrame -= (int)iFrameOff;
      }
      iFrameOff += hdr.byteOffsetFrames;
      iOff = (i64)zonefileGet32(&aEntry[12]);
      sz = (int)zonefileGet32(&aEntry[16]);

      sqlite3_bind_int64(pTab->pInsertIdx, 1, (i64)zonefileGet64(&aEntry[0]));
      sqlite3_bind_int64(pTab->pInsertIdx, 2, iFileid);
      if( hdr.encryptionType || hdr.compressionTypeContent ){
        sqlite3_bind_int64(pTab->pInsertIdx, 5, iOff);
        sqlite3_bind_int(pTab->pInsertIdx, 6, sz);
      }else{
        iFrameOff += iOff;
        szFrame = sz;
      }
      sqlite3_bind_int64(pTab->pInsertIdx, 3, iFrameOff);
      sqlite3_bind_int(pTab->pInsertIdx, 4, szFrame);

      sqlite3_step(pTab->pInsertIdx);
      rc = sqlite3_reset(pTab->pInsertIdx);
      if( rc!=SQLITE_OK ){
        pTab->base.zErrMsg = sqlite3_mprintf("%s", sqlite3_errmsg(pTab->db));
      }
    }
    sqlite3_free(aKey);
  }

  zonefileFileClose(pFd);
  return rc;
}

/*
** zonefile_files virtual table module xUpdate method.
**
** A delete specifies a single argument - the rowid of the row to remove.
** 
** Update and insert operations pass:
**
**   1. The "old" rowid, or NULL.
**   2. The "new" rowid.
**   3. Values for each of the 3 columns: (filename,ekey,header)
*/
static int zffUpdate(
  sqlite3_vtab *pVtab, 
  int nVal, 
  sqlite3_value **apVal, 
  sqlite_int64 *pRowid
){
  int rc = SQLITE_OK;
  int bUpdateKey = 0;
  ZonefileFilesTab *pTab = (ZonefileFilesTab*)pVtab;

  if( sqlite3_value_type(apVal[0])==SQLITE_INTEGER ){
    if( nVal>1 && sqlite3_value_nochange(apVal[2]) ){
      bUpdateKey = 1;
    }else{
      if( pTab->pDelete==0 ){
        rc = zonefilePrepare(pTab->db, &pTab->pDelete, &pVtab->zErrMsg,
            "DELETE FROM %Q.'%q_shadow_file' WHERE fileid=?",
            pTab->zDb, pTab->zBase
            );
      }
      if( rc==SQLITE_OK && pTab->pDeleteIdx==0 ){
        rc = zonefilePrepare(pTab->db, &pTab->pDeleteIdx, &pVtab->zErrMsg,
            "DELETE FROM %Q.'%q_shadow_idx' WHERE fileid=?",
            pTab->zDb, pTab->zBase
            );
      }

      if( rc==SQLITE_OK ){
        sqlite3_bind_value(pTab->pDelete, 1, apVal[0]);
        sqlite3_step(pTab->pDelete);
        rc = sqlite3_reset(pTab->pDelete);
      }
      if( rc==SQLITE_OK ){
        sqlite3_bind_value(pTab->pDeleteIdx, 1, apVal[0]);
        sqlite3_step(pTab->pDeleteIdx);
        rc = sqlite3_reset(pTab->pDeleteIdx);
      }
    }
  }
  if( nVal>1 ){
    i64 iFileid = 0;
    if( bUpdateKey ){
      iFileid = sqlite3_value_int64(apVal[0]);
    }else{
      const char *zFile = (const char*)sqlite3_value_text(apVal[2]);

      if( pTab->pInsert==0 ){
        rc = zonefilePrepare(pTab->db, &pTab->pInsert, &pVtab->zErrMsg,
            "INSERT INTO %Q.'%q_shadow_file'(filename) VALUES(?)",
            pTab->zDb, pTab->zBase
        );
      }

      /* Add the new entry to the %_shadow_file table. */
      if( rc==SQLITE_OK ){
        sqlite3_bind_text(pTab->pInsert, 1, zFile, -1, SQLITE_TRANSIENT);
        sqlite3_step(pTab->pInsert);
        rc = sqlite3_reset(pTab->pInsert);
      }

      /* Populate the %_shadow_idx table with entries for all keys in
      ** the zonefile just added to %_shadow_file.  */
      if( rc==SQLITE_OK ){
        iFileid = sqlite3_last_insert_rowid(pTab->db);
        rc = zonefilePopulateIndex(pTab, zFile, iFileid);
      }
    }

    if( rc==SQLITE_OK ){
      int nKey = sqlite3_value_bytes(apVal[3]);
      const u8 *aKey = (const u8*)sqlite3_value_blob(apVal[3]);
      rc = zonefileKeyStore(
          pTab->pGlobal, pTab->zDb, pTab->zBase, iFileid, aKey, nKey
      );
    }
  }

  return rc;
}

/* Each entry in the frame-cache is represented by an instance of the
** following structure.  */
typedef struct ZonefileFrame ZonefileFrame;
struct ZonefileFrame {
  i64 iFileid;               /* Fileid for this frame */
  i64 iFrameOff;             /* Offset of frame in file */
  int nBuf;                  /* Size of aBuf[] in bytes */
  u8 *aBuf;                  /* Buffer containing uncompressed frame data */
  ZonefileFrame *pLruNext;   /* Next element in LRU list */
  ZonefileFrame *pLruPrev;   /* Previous element in LRU list */
  ZonefileFrame *pHashNext;  /* Next element in same hash bucket */
};

typedef struct ZonefileTab ZonefileTab;
struct ZonefileTab {
  sqlite3_vtab base;         /* Base class - must be first */
  sqlite3 *db;
  sqlite3_stmt *pIdToName;   /* Translate fileid to filename */
  ZonefileGlobal *pGlobal;
  char *zName;               /* Name of this table */
  char *zDb;                 /* Name of db containing this table */

  /* The following variables are used to implement the frame-cache */
  int nCacheSize;            /* Configured cache size */
  int nCacheEntry;           /* Current number of entries in cache */
  int nCacheBucket;          /* Number of buckets in frame cache hash table */
  ZonefileFrame **aCache;    /* Array of hash buckets */
  ZonefileFrame *pCacheFirst;/* Most recently used frame */
  ZonefileFrame *pCacheLast; /* Least recently used frame (first to discard) */
};

typedef struct ZonefileCsr ZonefileCsr;
struct ZonefileCsr {
  sqlite3_vtab_cursor base;  /* Base class - must be first */
  sqlite3_stmt *pSelect;     /* SELECT on %_shadow_idx table */
};

/*
** Attempt to interpret the contents of string z as an integer. If
** successful, set (*piVal) to the integer value and return SQLITE_OK.
** Otherwise, return SQLITE_ERROR.
*/
static int zonefileParseInteger(const char *z, int *piVal){
  *piVal = atoi(z);
  return SQLITE_OK;
}

/*
** Return true character i is considered to be whitespace.
*/
static int zonefile_isspace(char i){
  return (i==' ');
}

/*
** This function is called as part of constructing zonefile virtual table
** pTab. Argument zOption is the full text of a parameter (column name)
** specified as part of the CREATE VIRTUAL TABLE statement. This function
** attempts to interpret the parameter and update structure pTab 
** accordingly. If successful, SQLITE_OK is returned. Otherwise, an
** SQLite error code is returned and (*pzErr) is left pointing to
** a buffer containing an English language error message. It is the
** responsibility of the caller to eventually free this buffer using
** sqlite3_free().
*/
static int zonefileParseOption(
  ZonefileTab *pTab,              /* Zonefile vtab under construction */
  const char *zOption,            /* Text of option (column name) */
  char **pzErr                    /* OUT: Error message */
){
  const char *z = zOption;
  const char *zOpt = z;
  int nOpt;
  const char *zVal;
  int rc = SQLITE_OK;

  /* Skip until EOF, whitespace or "=" */
  assert( 0==zonefile_isspace(*z) );
  while( *z && !zonefile_isspace(*z) && *z!='=' ) z++;
  nOpt = z-zOpt;

  /* Skip whitespace. Then check there is an "=". */
  while( zonefile_isspace(*z) ) z++;
  if( *z!='=' ) goto parse_error;
  z++;
  while( zonefile_isspace(*z) ) z++;
  zVal = z;

  if( nOpt==9 && sqlite3_strnicmp(zOpt, "cachesize", 9)==0 ){
    rc = zonefileParseInteger(zVal, &pTab->nCacheSize);
  }else{
    goto parse_error;
  }

  return rc;

 parse_error:
  *pzErr = sqlite3_mprintf("parse error in option: %s", zOption);
  return SQLITE_ERROR;
}

/*
** This function does the work of xCreate (if bCreate!=0) or xConnect
** (if bCreate==0) for the zonefile module.
**
**   argv[0]   -> module name  ("zonefile")
**   argv[1]   -> database name
**   argv[2]   -> table name
*/
static int zonefileCreateConnect(
  int bCreate,
  void *pAux,
  sqlite3 *db,
  int argc, const char *const*argv,
  sqlite3_vtab **ppVtab,
  char **pzErr
){
  ZonefileTab *p;
  const char *zName = argv[2];
  const char *zDb = argv[1];
  int nName = strlen(zName);
  int nDb = strlen(zDb);
  int rc = SQLITE_OK;

  p = (ZonefileTab*)sqlite3_malloc(sizeof(ZonefileTab) + nName+1 + nDb+1);
  if( !p ){
    rc = SQLITE_NOMEM;
  }else{
    int i;
    memset(p, 0, sizeof(ZonefileTab));
    p->zName = (char*)&p[1];
    memcpy(p->zName, zName, nName+1);
    p->zDb = &p->zName[nName+1];
    memcpy(p->zDb, zDb, nDb+1);
    p->db = db;
    p->pGlobal = (ZonefileGlobal*)pAux;
  
    if( bCreate ){
      char *zSql = sqlite3_mprintf(
          "CREATE TABLE %Q.'%q_shadow_idx'("
          "  k INTEGER PRIMARY KEY,"
          "  fileid INTEGER,"
          "  fofst INTEGER,"
          "  fsz INTEGER,"
          "  ofst INTEGER,"
          "  sz INTEGER"
          ");"
          "CREATE TABLE %Q.'%q_shadow_file'(" 
          "  filename TEXT,"
          "  fileid INTEGER PRIMARY KEY"
          ");" 
          "CREATE VIRTUAL TABLE %Q.'%q_files' USING zonefile_files;",
          zDb, zName, zDb, zName, zDb, zName
      );
  
      if( zSql==0 ){
        rc = SQLITE_NOMEM;
      }else{
        rc = sqlite3_exec(db, zSql, 0, 0, pzErr);
        sqlite3_free(zSql);
      }
    }
    
    if( rc==SQLITE_OK ){
      rc = sqlite3_declare_vtab(db, ZONEFILE_SCHEMA);
    }

    for(i=3; i<argc && rc==SQLITE_OK; i++){
      rc = zonefileParseOption(p, argv[i], pzErr);
    }
    if( rc==SQLITE_OK && p->nCacheSize<1 ) p->nCacheSize = 1;
  }

  if( rc!=SQLITE_OK ){
    sqlite3_free(p);
    p = 0;
  }
  *ppVtab = (sqlite3_vtab*)p;
  return rc;
}

/* 
** zonefile virtual table module xCreate method.
*/
static int zonefileCreate(
  sqlite3 *db,
  void *pAux,
  int argc, const char *const*argv,
  sqlite3_vtab **ppVtab,
  char **pzErr
){
  return zonefileCreateConnect(1, pAux, db, argc, argv, ppVtab, pzErr);
}

/* 
** zonefile virtual table module xConnect method.
*/
static int zonefileConnect(
  sqlite3 *db,
  void *pAux,
  int argc, const char *const*argv,
  sqlite3_vtab **ppVtab,
  char **pzErr
){
  return zonefileCreateConnect(0, pAux, db, argc, argv, ppVtab, pzErr);
}

/* 
** Zonefile virtual table module xBestIndex method.
**
** Equality and range constraints on either the rowid or column "k" (which
** are the same thing) are processed. Bits in the idxNum parameter are
** set to indicate the constraints present:
**
**   0x01:   k == ? 
**   0x02:   k <  ? 
**   0x04:   k <= ? 
**   0x08:   k >  ? 
**   0x10:   k >= ? 
**
** Only some combinations are valid:
**
**   * If an == constraint is found, no other bits are set.
**   * If a < constraint is present, any <= is ignored.
**   * If a > constraint is present, any >= is ignored.
*/
static int zonefileBestIndex(sqlite3_vtab *pVtab, sqlite3_index_info *pInfo){
  int iEq = -1;
  int iLt = -1;
  int iLe = -1;
  int iGt = -1;
  int iGe = -1;
  int i;
  int idxNum = 0;
  double cost = 1000000000.0;

  for(i=0; i<pInfo->nConstraint; i++){
    struct sqlite3_index_constraint *p = &pInfo->aConstraint[i];
    if( p->usable && p->iColumn<=0 ){
      switch( p->op ){
        case SQLITE_INDEX_CONSTRAINT_EQ: iEq = i; break;
        case SQLITE_INDEX_CONSTRAINT_LT: iLt = i; break;
        case SQLITE_INDEX_CONSTRAINT_LE: iLe = i; break;
        case SQLITE_INDEX_CONSTRAINT_GT: iGt = i; break;
        case SQLITE_INDEX_CONSTRAINT_GE: iGe = i; break;
      }
    }
  }

  if( iEq>=0 ){
    cost = 10.0;
    idxNum = 0x01;
    pInfo->aConstraintUsage[iEq].argvIndex = 1;
  }else{
    int iIdx = 1;
    if( iLt>=0 ){
      pInfo->aConstraintUsage[iLt].argvIndex = iIdx++;
      idxNum |= 0x02;
    }else if( iLe>=0 ){
      pInfo->aConstraintUsage[iLe].argvIndex = iIdx++;
      idxNum |= 0x04;
    }
    if( iGt>=0 ){
      pInfo->aConstraintUsage[iGt].argvIndex = iIdx++;
      idxNum |= 0x08;
    }else if( iGe>=0 ){
      pInfo->aConstraintUsage[iGe].argvIndex = iIdx++;
      idxNum |= 0x10;
    }

    if( iIdx==2 ) cost = 10000.0;
    if( iIdx==3 ) cost = 100.0;
  }

  pInfo->idxNum = idxNum;
  pInfo->estimatedCost = cost;

  return SQLITE_OK;
}

/* 
** zonefile virtual table module xOpen method.
*/
static int zonefileOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){
  ZonefileCsr *pCsr;
  pCsr = (ZonefileCsr*)sqlite3_malloc(sizeof(ZonefileCsr));
  if( pCsr==0 ){
    return SQLITE_NOMEM;
  }
  memset(pCsr, 0, sizeof(ZonefileCsr));
  *ppCursor = (sqlite3_vtab_cursor*)pCsr;
  return SQLITE_OK;
}

/* 
** Reset a ZonefileCsr object to the state it is in immediately after
** it is allocated by zffOpen().
*/
static void zonefileCursorReset(ZonefileCsr *pCsr){
  sqlite3_finalize(pCsr->pSelect);
  pCsr->pSelect = 0;
}

/* 
** zonefile virtual table module xClose method.
*/
static int zonefileClose(sqlite3_vtab_cursor *cur){
  ZonefileCsr *pCsr = (ZonefileCsr*)cur;
  zonefileCursorReset(pCsr);
  sqlite3_free(pCsr);
  return SQLITE_OK;
}

/* 
** zonefile virtual table module xNext method.
*/
static int zonefileNext(sqlite3_vtab_cursor *cur){
  ZonefileCsr *pCsr = (ZonefileCsr*)cur;
  int rc = SQLITE_OK;
  if( SQLITE_ROW!=sqlite3_step(pCsr->pSelect) ){
    rc = sqlite3_finalize(pCsr->pSelect);
    if( rc!=SQLITE_OK ){
      ZonefileTab *pTab = (ZonefileTab*)pCsr->base.pVtab;
      pTab->base.zErrMsg = sqlite3_mprintf("%s", sqlite3_errmsg(pTab->db));
    }
    pCsr->pSelect = 0;
  }
  return rc;
}

/* 
** zonefile virtual table module xFilter method.
*/
static int zonefileFilter(
  sqlite3_vtab_cursor *cur, 
  int idxNum, const char *idxStr,
  int argc, sqlite3_value **argv
){
  ZonefileCsr *pCsr = (ZonefileCsr*)cur;
  ZonefileTab *pTab = (ZonefileTab*)pCsr->base.pVtab;
  int rc;

  const char *z1 = 0;
  const char *z2 = 0;

  if( idxNum & 0x01 ){
    z1 = "k = ?";
  }else{
    if( idxNum & 0x02 ) { z1 = "k < ?"; }
    if( idxNum & 0x04 ) { z1 = "k <= ?"; }
    if( idxNum & 0x08 ) { if( z1 ) z2 = "k > ?"; else z1 = "k > ?"; }
    if( idxNum & 0x10 ) { if( z1 ) z2 = "k >= ?"; else z1 = "k >= ?"; }
  }

  rc = zonefilePrepare(pTab->db, &pCsr->pSelect, &pTab->base.zErrMsg, 
      "SELECT k, fileid, fofst, fsz, ofst, sz FROM %Q.'%q_shadow_idx'%s%s%s%s",
      pTab->zDb, pTab->zName,
      z1 ? " WHERE " : "", z1, 
      z2 ? " AND " : "", z2
  );

  if( z1 ) sqlite3_bind_value(pCsr->pSelect, 1, argv[0]);
  if( z2 ) sqlite3_bind_value(pCsr->pSelect, 2, argv[1]);

  if( rc==SQLITE_OK ){
    rc = zonefileNext(cur);
  }

  return rc;
}

/*
** zonefile virtual table module xEof method.
*/
static int zonefileEof(sqlite3_vtab_cursor *cur){
  ZonefileCsr *pCsr = (ZonefileCsr*)cur;
  return (pCsr->pSelect==0);
}

static void zonefileFree(void *p){
  sqlite3_free(p);
}

static int zonefileGetFile(
  sqlite3_context *pCtx,          /* Leave error message here */
  ZonefileCsr *pCsr,              /* Cursor object */
  const char **pzFile             /* OUT: Pointer to current file */
){
  ZonefileTab *pTab = (ZonefileTab*)pCsr->base.pVtab;
  int rc = SQLITE_OK;
  i64 iFileid;

  if( pTab->pIdToName==0 ){
    rc = zonefilePrepare(pTab->db, &pTab->pIdToName, &pTab->base.zErrMsg, 
        "SELECT filename FROM %Q.'%q_shadow_file' WHERE fileid=?",
        pTab->zDb, pTab->zName
    );
    if( rc==SQLITE_ERROR ) zonefileTransferError(pCtx);
  }

  if( rc==SQLITE_OK ){
    iFileid = sqlite3_column_int64(pCsr->pSelect,1);
    sqlite3_bind_int64(pTab->pIdToName, 1, iFileid);
    if( SQLITE_ROW==sqlite3_step(pTab->pIdToName) ){
      *pzFile = (const char*)sqlite3_column_text(pTab->pIdToName, 0);
    }else{
      rc = sqlite3_reset(pTab->pIdToName);
      if( rc==SQLITE_OK ){
        rc = SQLITE_CORRUPT_VTAB;
      }else{
        zonefileTransferError(pCtx);
      }
    }
  }

  return rc;
}

static void zonefileReleaseFile(ZonefileCsr *pCsr){
  ZonefileTab *pTab = (ZonefileTab*)pCsr->base.pVtab;
  sqlite3_reset(pTab->pIdToName);
}

static int zonefileValueReadDirect(sqlite3_context *pCtx, ZonefileCsr *pCsr){
  i64 iOff = sqlite3_column_int64(pCsr->pSelect, 2);
  int sz = sqlite3_column_int(pCsr->pSelect, 3);

  FILE *pFd = 0;                  /* File handle open on zonefile */
  u8 *aBuf;                       /* Buffer to read blob into */
  int rc;                         /* Return code */

  aBuf = sqlite3_malloc(sz);
  if( aBuf==0 ){
    rc = SQLITE_NOMEM;
  }else{
    const char *zFile = 0;
    /* Open the file to read the blob from */
    rc = zonefileGetFile(pCtx, pCsr, &zFile);
    if( rc==SQLITE_OK ){
      char *zErr = 0;
      pFd = zonefileFileOpen(zFile, 0, &zErr);
      if( pFd==0 ){ 
        sqlite3_result_error(pCtx, zErr, -1);
        sqlite3_free(zErr);
        rc = SQLITE_ERROR;
      }
      zonefileReleaseFile(pCsr);
    }
  }

  if( rc==SQLITE_OK ){
    rc = zonefileFileRead(pFd, aBuf, sz, iOff);
    if( rc==SQLITE_OK ){
      sqlite3_result_blob(pCtx, aBuf, sz, zonefileFree);
      aBuf = 0;
    }
  }

  zonefileFileClose(pFd);
  sqlite3_free(aBuf);
  return rc;
}

#ifndef NDEBUG
static void zonefileCacheCheck(ZonefileTab *pTab){
  ZonefileFrame *p;
  int n = 0;
  for(p=pTab->pCacheFirst; p; p=p->pLruNext){
    assert( p!=pTab->pCacheFirst || p->pLruPrev==0 );
    assert( p!=pTab->pCacheLast || p->pLruNext==0 );
    assert( p==pTab->pCacheFirst || p->pLruPrev->pLruNext==p );
    assert( p==pTab->pCacheLast || p->pLruNext->pLruPrev==p );
    n++;
  }
  assert( n==pTab->nCacheEntry );
}
#else
# define zonefileCacheCheck(x)
#endif

/*
** Search the frame-cache belonging to virtual table pTab for an entry
** corresponding to the frame at byte offset iFrameOff of the file with
** file id iFile. If such an entry is found, return a pointer to it.
** Otherwise, if no such entry exists, return NULL.
*/
static ZonefileFrame *zonefileCacheFind(
  ZonefileTab *pTab, 
  i64 iFile, 
  i64 iFrameOff
){
  ZonefileFrame *pFrame;
  for(pFrame=pTab->pCacheFirst; pFrame; pFrame=pFrame->pLruNext){
    if( pFrame->iFileid==iFile && pFrame->iFrameOff==iFrameOff ){
      /* Found a match. Move it to the front of the LRU list and return
      ** a pointer to it. */
      assert( (pFrame->pLruPrev==0)==(pFrame==pTab->pCacheFirst) );
      assert( (pFrame->pLruNext==0)==(pFrame==pTab->pCacheLast) );
      if( pFrame->pLruPrev ){
        assert( pFrame==pFrame->pLruPrev->pLruNext );
        pFrame->pLruPrev->pLruNext = pFrame->pLruNext;

        if( pFrame->pLruNext ){
          assert( pFrame==pFrame->pLruNext->pLruPrev );
          pFrame->pLruNext->pLruPrev = pFrame->pLruPrev;
        }else{
          assert( pFrame==pTab->pCacheLast );
          pTab->pCacheLast = pFrame->pLruPrev;
          pTab->pCacheLast->pLruNext = 0;
        }

        pFrame->pLruPrev = 0;
        pFrame->pLruNext = pTab->pCacheFirst;
        pTab->pCacheFirst->pLruPrev = pFrame;
        pTab->pCacheFirst = pFrame;
      }

      zonefileCacheCheck(pTab);
      return pFrame;
    }
  }
  return 0;
}

/*
** Return the index of the hash bucket that iFileid/iFrameOff belongs to.
*/
int zonefileCacheHash(ZonefileTab *pTab, i64 iFileid, i64 iFrameOff){
  u32 h;
  h = (iFileid & 0xFFFFFFFF) ^ (iFrameOff & 0xFFFFFFFF);
  return (h % pTab->nCacheBucket);
}

/*
** Store the frame object passed as the second argument in the frame
** cache belonging to table pTab.
*/
static int zonefileCacheStore(ZonefileTab *pTab, ZonefileFrame *pFrame){
  int h;

  /* Allocate the hash table if it has not already been allocated. */
  if( pTab->aCache==0 ){
    int nByte = pTab->nCacheSize * 2 * sizeof(ZonefileFrame*);
    pTab->aCache = (ZonefileFrame**)sqlite3_malloc(nByte);
    if( pTab->aCache==0 ){
      sqlite3_free(pFrame);
      return SQLITE_NOMEM;
    }
    memset(pTab->aCache, 0, nByte);
    pTab->nCacheBucket = pTab->nCacheSize * 2;
  }

  /* Add the new entry to the hash table */
  h = zonefileCacheHash(pTab, pFrame->iFileid, pFrame->iFrameOff);
  assert( h>=0 && h<pTab->nCacheBucket );
  pFrame->pHashNext = pTab->aCache[h];
  pTab->aCache[h] = pFrame;

  /* Add the new entry to the LRU list */
  pFrame->pLruPrev = 0;
  pFrame->pLruNext = pTab->pCacheFirst;
  pTab->pCacheFirst = pFrame;
  if( pFrame->pLruNext==0 ){
    pTab->pCacheLast = pFrame;
  }else{
    pFrame->pLruNext->pLruPrev = pFrame;
  }
  pTab->nCacheEntry++;

  if( pTab->nCacheEntry>pTab->nCacheSize ){
    ZonefileFrame **pp;

    /* Remove the oldest entry from the LRU list. */
    ZonefileFrame *pLast = pTab->pCacheLast;
    assert( pTab->pCacheLast );
    assert( pTab->nCacheEntry>1 );
    pTab->pCacheLast = pLast->pLruPrev;
    pTab->pCacheLast->pLruNext = 0;
    pTab->nCacheEntry--;

    /* Remove the same entry from the hash table. */
    h = zonefileCacheHash(pTab, pLast->iFileid, pLast->iFrameOff);
    assert( h>=0 && h<pTab->nCacheBucket );
    for(pp=&pTab->aCache[h]; *pp!=pLast; pp=&((*pp)->pHashNext));
    *pp = pLast->pHashNext;
    sqlite3_free(pLast);
  }
  zonefileCacheCheck(pTab);

  return SQLITE_OK;
}

/*
** Delete all resources associated with the frame-cache for table pTab.
*/
static void zonefileCacheDelete(ZonefileTab *pTab){
  ZonefileFrame *p;
  ZonefileFrame *pNext;
  for(p=pTab->pCacheFirst; p; p=pNext){
    pNext = p->pLruNext;
    sqlite3_free(p);
  }
  sqlite3_free(pTab->aCache);
}

static int zonefileValueReadCache(sqlite3_context *pCtx, ZonefileCsr *pCsr){
  int rc = SQLITE_OK;
  ZonefileTab *pTab = (ZonefileTab*)pCsr->base.pVtab;
  ZonefileFrame *pFrame = 0;
  i64 iFile = sqlite3_column_int64(pCsr->pSelect, 1);
  i64 iFrameOff = sqlite3_column_int64(pCsr->pSelect, 2);
  i64 iKeyOff = sqlite3_column_int64(pCsr->pSelect, 4);
  int nKeySz = sqlite3_column_int(pCsr->pSelect, 5);

  /* Check if this frame is already in the cache. If not, read it from 
  ** the file.  */
  pFrame = zonefileCacheFind(pTab, iFile, iFrameOff);
  if( pFrame==0 ){
    const char *zFile = 0;
    char *zErr = 0;
    FILE *pFd = 0;
    ZonefileHeader hdr = { 0 };
    ZonefileCompress *pCmpMethod = 0;
    ZonefileCodec *pCodec = 0;
    void *pCmp = 0;

    /* Open the file to read the blob from */
    rc = zonefileGetFile(pCtx, pCsr, &zFile);
    if( rc==SQLITE_OK ){
      pFd = zonefileFileOpen(zFile, 0, &zErr);
      if( pFd==0 ) rc = SQLITE_ERROR;
    }

    /* Read the zonefile header */
    if( rc==SQLITE_OK ){
      rc = zonefileReadHeader(pFd, zFile, &hdr, &zErr);
    }

    /* Find the compression method and open the compressor handle. */
    if( rc==SQLITE_OK ){
      rc = zonefileFindCompress(hdr.compressionTypeContent, &pCmpMethod, &zErr);
    }
    if( pCmpMethod ){
      int nDict = 0;
      u8 *aDict = 0;
      assert( rc==SQLITE_OK );
      if( hdr.byteOffsetDictionary ){
        nDict = hdr.byteOffsetFrames - hdr.byteOffsetDictionary;
        aDict = sqlite3_malloc(nDict);
        if( aDict==0 ){
          rc = SQLITE_NOMEM;
        }else{
          rc = zonefileFileRead(pFd, aDict, nDict, hdr.byteOffsetDictionary);
        }
      }
      if( rc==SQLITE_OK ){
        rc = pCmpMethod->xOpen(&pCmp, aDict, nDict);
      }
      sqlite3_free(aDict);
    }

    /* Find the encryption method and key. */
    if( rc==SQLITE_OK && hdr.encryptionType ){
      const u8 *a = 0;
      int n = zonefileKeyFind(pTab->pGlobal, pTab->zDb, pTab->zName, iFile, &a);
      if( n==0 ){
        zErr = sqlite3_mprintf("missing encryption key for file \"%s\"", zFile);
        rc = SQLITE_ERROR;
      }else{
        rc = zonefileCodecCreate(hdr.encryptionType, 0, (u8*)a,n,&pCodec,&zErr);
      }
    }

    /* Read some data into memory. */
    if( rc==SQLITE_OK ){
      int szFrame = sqlite3_column_int(pCsr->pSelect, 3);

      pFrame = (ZonefileFrame*)sqlite3_malloc(szFrame + sizeof(ZonefileFrame));
      if( pFrame==0 ){
        rc = SQLITE_NOMEM;
      }else{
        memset(pFrame, 0, sizeof(ZonefileFrame));
        pFrame->aBuf = (u8*)&pFrame[1];
        pFrame->nBuf = szFrame;
        pFrame->iFrameOff = iFrameOff;
        pFrame->iFileid = iFile;
        rc = zonefileFileRead(pFd, pFrame->aBuf, szFrame, iFrameOff);
      }
    }

    /* Decrypt data if necessary */
    if( rc==SQLITE_OK && pCodec ){
      zonefileCodecDecode(pCodec, pFrame->aBuf, pFrame->nBuf);
      pFrame->nBuf -= zonefileCodecNonceSize(pCodec);
    }

    /* Uncompress data if required */
    if( rc==SQLITE_OK && pCmpMethod ){
      ZonefileFrame *p = 0;
      int nOut = pCmpMethod->xUncompressSize(pCmp, pFrame->aBuf, pFrame->nBuf);

      p = (ZonefileFrame*)sqlite3_malloc(nOut + sizeof(ZonefileFrame));
      if( p==0 ){
        rc = SQLITE_NOMEM;
      }else{
        memset(p, 0, sizeof(ZonefileFrame));
        p->aBuf = (u8*)&p[1];
        p->nBuf = nOut;
        p->iFrameOff = iFrameOff;
        p->iFileid = iFile;
        rc = pCmpMethod->xUncompress(
            pCmp, p->aBuf, p->nBuf, pFrame->aBuf, pFrame->nBuf
        );
        sqlite3_free(pFrame);
        pFrame = p;
      }
    }

    if( rc!=SQLITE_OK ){
      sqlite3_free(pFrame);
      pFrame = 0;
    }else{
      rc = zonefileCacheStore(pTab, pFrame);
      if( rc!=SQLITE_OK ) pFrame = 0;
    }
    zonefileReleaseFile(pCsr);
    zonefileFileClose(pFd);
    zonefileCodecDestroy(pCodec);
    if( pCmpMethod ) pCmpMethod->xClose(pCmp);

    if( zErr ){
      assert( rc!=SQLITE_OK );
      sqlite3_result_error(pCtx, zErr, -1);
      sqlite3_free(zErr);
    }
  }

  if( pFrame ){
    assert( rc==SQLITE_OK );
    sqlite3_result_blob(pCtx, &pFrame->aBuf[iKeyOff], nKeySz, SQLITE_TRANSIENT);
  }

  return rc;
}

/* 
** zonefile virtual table module xColumn method.
*/
static int zonefileColumn(
  sqlite3_vtab_cursor *cur, 
  sqlite3_context *pCtx, 
  int i
){
  ZonefileCsr *pCsr = (ZonefileCsr*)cur;
  int rc = SQLITE_OK;
  switch( i ){
    case 0: /* k */
      sqlite3_result_value(pCtx, sqlite3_column_value(pCsr->pSelect, 0));
      break;
    case 1: /* v */
      if( sqlite3_column_type(pCsr->pSelect, 5)==SQLITE_NULL ){
        rc = zonefileValueReadDirect(pCtx, pCsr);
      }else{
        rc = zonefileValueReadCache(pCtx, pCsr);
      }
      break;
    case 2: /* fileid */
      sqlite3_result_value(pCtx, sqlite3_column_value(pCsr->pSelect, 1));
      break;
    default: { /* sz */
      int iCol;
      if( sqlite3_column_type(pCsr->pSelect, 5)==SQLITE_NULL ){
        iCol = 3;
      }else{
        iCol = 5;
      }
      sqlite3_result_value(pCtx, sqlite3_column_value(pCsr->pSelect, iCol));
      break;
    }
  }
  return rc;
}

/* 
** zonefile virtual table module xDisconnect method.
*/
static int zonefileDisconnect(sqlite3_vtab *pVtab){
  ZonefileTab *pTab = (ZonefileTab*)pVtab;
  zonefileCacheDelete(pTab);
  sqlite3_finalize(pTab->pIdToName);
  sqlite3_free(pTab);
  return SQLITE_OK;
}

/* 
** zonefile virtual table module xDestroy method.
*/
static int zonefileDestroy(sqlite3_vtab *pVtab){
  ZonefileTab *pTab = (ZonefileTab*)pVtab;
  int rc = SQLITE_OK;
  char *zSql = sqlite3_mprintf(
      "DROP TABLE IF EXISTS %Q.'%q_shadow_idx';"
      "DROP TABLE IF EXISTS %Q.'%q_shadow_file';"
      "DROP TABLE IF EXISTS %Q.'%q_shadow_frame';"
      "DROP TABLE IF EXISTS %Q.'%q_files';",
      pTab->zDb, pTab->zName, pTab->zDb, pTab->zName, 
      pTab->zDb, pTab->zName, pTab->zDb, pTab->zName
  );
  if( zSql==0 ){
    rc = SQLITE_NOMEM;
  }else{
    rc = sqlite3_exec(pTab->db, zSql, 0, 0, 0);
    sqlite3_free(zSql);
  }

  if( rc==SQLITE_OK ){
    zonefileDisconnect(pVtab);
  }
  return rc;
}

/* 
** zonefile virtual table module xRowid method.
*/
static int zonefileRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
  ZonefileCsr *pCsr = (ZonefileCsr*)cur;
  *pRowid = sqlite3_column_int64(pCsr->pSelect, 0);
  return SQLITE_OK;
}

/*
** Register the "zonefile" extensions.
*/
static int zonefileRegister(sqlite3 *db){
  static sqlite3_module filesModule = {
    0,                            /* iVersion */
    zffCreate,                    /* xCreate - create a table */
    zffConnect,                   /* xConnect - connect to an existing table */
    zffBestIndex,                 /* xBestIndex - Determine search strategy */
    zffDisconnect,                /* xDisconnect - Disconnect from a table */
    zffDisconnect,                /* xDestroy - Drop a table */
    zffOpen,                      /* xOpen - open a cursor */
    zffClose,                     /* xClose - close a cursor */
    zffFilter,                    /* xFilter - configure scan constraints */
    zffNext,                      /* xNext - advance a cursor */
    zffEof,                       /* xEof */
    zffColumn,                    /* xColumn - read data */
    zffRowid,                     /* xRowid - read data */
    zffUpdate,                    /* xUpdate - write data */
    0,                            /* xBegin - begin transaction */
    0,                            /* xSync - sync transaction */
    0,                            /* xCommit - commit transaction */
    0,                            /* xRollback - rollback transaction */
    0,                            /* xFindFunction - function overloading */
    0,                            /* xRename - rename the table */
    0,                            /* xSavepoint */
    0,                            /* xRelease */
    0                             /* xRollbackTo */
  };
  static sqlite3_module zonefileModule = {
    0,                            /* iVersion */
    zonefileCreate,               /* xCreate - create a table */
    zonefileConnect,              /* xConnect - connect to an existing table */
    zonefileBestIndex,            /* xBestIndex - Determine search strategy */
    zonefileDisconnect,           /* xDisconnect - Disconnect from a table */
    zonefileDestroy,              /* xDestroy - Drop a table */
    zonefileOpen,                 /* xOpen - open a cursor */
    zonefileClose,                /* xClose - close a cursor */
    zonefileFilter,               /* xFilter - configure scan constraints */
    zonefileNext,                 /* xNext - advance a cursor */
    zonefileEof,                  /* xEof */
    zonefileColumn,               /* xColumn - read data */
    zonefileRowid,                /* xRowid - read data */
    0,                            /* xUpdate - write data */
    0,                            /* xBegin - begin transaction */
    0,                            /* xSync - sync transaction */
    0,                            /* xCommit - commit transaction */
    0,                            /* xRollback - rollback transaction */
    0,                            /* xFindFunction - function overloading */
    0,                            /* xRename - rename the table */
    0,                            /* xSavepoint */
    0,                            /* xRelease */
    0                             /* xRollbackTo */
  };

  struct Func {
    const char *z;
    int n;
    void (*x)(sqlite3_context*,int,sqlite3_value**);
  } aFunc[] = {
    { "zonefile_write", 2, zonefileWriteFunc },
    { "zonefile_write", 3, zonefileWriteFunc },
  };
  ZonefileGlobal *pGlobal = 0;

  int rc = SQLITE_OK;
  int i;

  for(i=0; rc==SQLITE_OK && i<sizeof(aFunc)/sizeof(aFunc[0]); i++){
    struct Func *p = &aFunc[i];
    rc = sqlite3_create_function(db, p->z, p->n, SQLITE_ANY, 0, p->x, 0, 0);
  }

  if( rc==SQLITE_OK ){
    pGlobal = (ZonefileGlobal*)sqlite3_malloc(sizeof(ZonefileGlobal));
    if( pGlobal==0 ){
      rc = SQLITE_NOMEM;
    }else{
      memset(pGlobal, 0, sizeof(ZonefileGlobal));
    }
  }

  if( rc==SQLITE_OK ){
    rc = sqlite3_create_module(
        db, "zonefile_files", &filesModule, (void*)pGlobal
    );
  }
  if( rc==SQLITE_OK ){
    rc = sqlite3_create_module_v2(db, "zonefile", &zonefileModule, 
        (void*)pGlobal, zonefileKeyDestroy
    );
    pGlobal = 0;
  }

  sqlite3_free(pGlobal);
  return rc;
}

#else         /* SQLITE_OMIT_VIRTUALTABLE */
# define zonefileRegister(x) SQLITE_OK
#endif

#ifdef _WIN32
__declspec(dllexport)
#endif
int sqlite3_zonefile_init(
  sqlite3 *db, 
  char **pzErrMsg, 
  const sqlite3_api_routines *pApi
){
  SQLITE_EXTENSION_INIT2(pApi);
  (void)pzErrMsg;  /* Unused parameter */
  return zonefileRegister(db);
}

Added ext/zonefile/zonefile1.test.









































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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# 2018 Feb 11
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# The focus of this file is testing the zonefile extension.
#

if {![info exists testdir]} {
  set testdir [file join [file dirname [info script]] .. .. test]
}
source [file join $testdir tester.tcl]
set testprefix zonefile1
load_static_extension db zonefile

do_execsql_test 1.0 {
  CREATE TABLE zz(k INTEGER PRIMARY KEY, frame INTEGER, idx INTEGER, v BLOB);
  INSERT INTO zz VALUES(1, -1, -1, randomblob(100));
  INSERT INTO zz VALUES(2, -1, -1, randomblob(100));
  INSERT INTO zz VALUES(3, -1, -1, randomblob(100));
}

do_execsql_test 1.1 {
  SELECT zonefile_write('test.zonefile', 'zz');
} {{}}

do_execsql_test 1.2 {
  CREATE VIRTUAL TABLE z1 USING zonefile;
  SELECT name FROM sqlite_master WHERE name LIKE 'z1%' ORDER BY 1;
} {z1 z1_files z1_shadow_file z1_shadow_idx}

do_execsql_test 1.3 {
  INSERT INTO z1_files(filename) VALUES('test.zonefile');
  SELECT filename, 
         json_extract(header, '$.magicNumber'),
         json_extract(header, '$.numFrames'),
         json_extract(header, '$.numKeys')
         FROM z1_files;
} {test.zonefile 1179332920 1 3}

do_execsql_test 1.4 { SELECT count(*) FROM z1_shadow_idx } 3

do_execsql_test 1.5.1 { SELECT k FROM z1 } {1 2 3}
do_execsql_test 1.5.2 { SELECT fileid FROM z1 } {1 1 1}
do_execsql_test 1.5.4 { SELECT sz FROM z1 } {100 100 100}

do_execsql_test 1.5.5 {
  SELECT zz.v==z1.v FROM zz, z1 WHERE zz.k=z1.k
} {1 1 1}

do_execsql_test 1.5 {
  DELETE FROM z1_files;
  SELECT * FROM z1_files;
} {}

do_execsql_test 1.6 { SELECT count(*) FROM z1_shadow_idx } 0

do_execsql_test 1.7 { DROP TABLE z1 }

do_execsql_test 1.8 {
  SELECT * FROM sqlite_master WHERE name LIKE 'z1%';
}

#-------------------------------------------------------------------------
# Figure out which compression algorithms, if any, are supported by
# this build. Populate the global list $COMPRESSION_METHODS with the
# result.
reset_db
load_static_extension db zonefile
do_execsql_test 2.0 {
  CREATE TABLE bb(
    k INTEGER PRIMARY KEY, 
    frame INTEGER DEFAULT -1, 
    idx INTEGER DEFAULT -1, 
    v BLOB
  );
  INSERT INTO bb(k, v) VALUES(1, randomblob(100));
}
set COMPRESSION_METHODS [list]
foreach cmp {
  none zlib zstd zstd_global_dict lz4 lz4hc brotli nosuchcmp
} {
  set res [catchsql {
    WITH p(n,v) AS (
        VALUES('compressionTypeContent', $cmp)
    )
    SELECT zonefile_write('test.zonefile', 'bb', json_group_object(n,v)) FROM p;
  }]

  if {[lindex $res 0]==0} {
    lappend COMPRESSION_METHODS $cmp
  }
}

# Check that it is not possible to use zstd_global_dict to compress
# the zonefile index.
#
if {[lsearch $COMPRESSION_METHODS zstd_global_dict]>=0} {
  do_catchsql_test 2.1 {
    WITH p(n,v) AS (
        VALUES('compressionTypeIndexData', 'zstd_global_dict')
    )
    SELECT zonefile_write('test.zonefile', 'bb', json_group_object(n,v)) FROM p;
  } {1 {compressor "zstd_global_dict" may not be used to compress the zonefile index}}
}

set extra_header 0
set cachesize 0
foreach cmp $COMPRESSION_METHODS { foreach cmpidx $COMPRESSION_METHODS {
  if {$cmpidx == "zstd_global_dict"} continue
  reset_db
  load_static_extension db zonefile

  set tn "$cmp/$cmpidx"
  set extra_header [expr {$extra_header ? 0 : 100}]
  set cachesize [expr {$cachesize ? 0 : 10}]

  do_execsql_test 2.$tn.0.1 {
    CREATE TABLE zz(
      k INTEGER PRIMARY KEY, 
      frame INTEGER DEFAULT -1, 
      idx INTEGER DEFAULT -1, 
      v BLOB
    );
    CREATE TABLE rt(k INTEGER PRIMARY KEY, v BLOB);
  }

  do_execsql_test 2.$tn.0.2 "
    CREATE VIRTUAL TABLE zone USING zonefile(cachesize = $cachesize)
  " {}
  
  set nMinByte   0
  set nMaxByte 444
  foreach {zonefile lKey} {
    test1.zonefile {195 1238 298 405 297}
    test2.zonefile {124 1624 82 1929}
    test3.zonefile {932 683 1751 410 41}
    test4.zonefile {427 1491}
    test5.zonefile {1004 473 801 394 1672 816 1577}
    test6.zonefile {1374 1454 1005}
    test7.zonefile {450 241 319 133}
    test8.zonefile {1414 900 1406 1917 127 673}
    test9.zonefile {1192 226 988 1292 718 1345 1675}
    test10.zonefile {314}
    test11.zonefile {1177 1597 60 532 291 1164 812}
    test12.zonefile {1168 1290 1585 939 1916}
    test13.zonefile {644 1784 1476 1283 433 506}
    test14.zonefile {1141 1547 1506 364}
    test15.zonefile {1756 1885 844 1880 1896 354}
    test16.zonefile {1383 1928 1371}
    test17.zonefile {93}
    test18.zonefile {1067}
    test19.zonefile {642}
    test20.zonefile {1380 1857}
    test21.zonefile {288 293 1968 1207 1739 231 300}
    test22.zonefile {651 1007 607 830 299 1431}
    test23.zonefile {81 1651 543 1949 256 119 1088}
    test24.zonefile {1278 2024 682 1115 194 636 1804}
    test25.zonefile {514 1155 171 2015 791}
    test26.zonefile {1615 1228 147 1464}
    test27.zonefile {55 1130 781 678 78}
    test28.zonefile {1981 1401 1178}
    test29.zonefile {1754 864 183 1953 1901}
    test30.zonefile {1461 817}
    test31.zonefile {1720 1722 686 1833}
  } {
    forcedelete $zonefile
    execsql { DELETE FROM zz; }
    foreach k $lKey {
      execsql { INSERT INTO zz(k, v) VALUES($k, randomblob($k)) }
    }
    execsql { INSERT INTO rt SELECT k, v FROM zz }
    execsql { 
      WITH p(n,v) AS (
        VALUES('maxAutoFrameSize', 2000) UNION ALL
        VALUES('compressionTypeIndexData', $cmpidx) UNION ALL
        VALUES('compressionTypeContent', $cmp) UNION ALL
        VALUES('debugExtendedHeaderSize', $extra_header)
      )
      SELECT zonefile_write($zonefile, 'zz', json_group_object(n, v)) FROM p;
      INSERT INTO zone_files(filename) VALUES($zonefile);
    }
  }
  
  do_execsql_test 2.$tn.1 {
    SELECT k FROM zone JOIN rt USING (k) WHERE zone.v!=rt.v
  }
  do_execsql_test 2.$tn.2 {
    SELECT count(*) FROM zone JOIN rt USING (k);
  } {135}
  do_execsql_test 2.$tn.3 {
    SELECT filename, 
           json_extract(header, '$.numKeys'),
           json_extract(header, '$.numFrames')
    FROM zone_files 
    WHERE filename IN ('test19.zonefile', 'test20.zonefile', 'test21.zonefile')
    ORDER BY 1
  } {
    test19.zonefile 1 1
    test20.zonefile 2 2
    test21.zonefile 7 4
  }
}}

#--------------------------------------------------------------------------
#
reset_db
load_static_extension db zonefile
do_execsql_test 3.0 {
  CREATE TABLE dd(k INTEGER PRIMARY KEY, frame INTEGER, idx INTEGER, v BLOB);
  INSERT INTO dd VALUES(1000, 1, -1, randomblob(44));
  INSERT INTO dd VALUES(1001, 1, -1, randomblob(55));
  INSERT INTO dd VALUES(1002, 2, -1, randomblob(66));
  WITH p(n,v) AS (
      VALUES('maxAutoFrameSize', 2000) UNION ALL
      VALUES('encryptionType', 'xor') UNION ALL
      VALUES('debugEncryptionKeyText', 1) UNION ALL
      VALUES('encryptionKey', '0123456789')
  )
  SELECT zonefile_write('test.zonefile', 'dd', json_group_object(n, v)) FROM p;
} {{}}

do_execsql_test 3.1 {
  CREATE VIRTUAL TABLE cc USING zonefile;
  INSERT INTO cc_files(filename,ekey) VALUES('test.zonefile','0123456789');
  SELECT quote(dd.v)==quote(cc.v) FROM cc JOIN dd USING (k)
} {1 1 1}

do_execsql_test 3.2.1 {
  DELETE FROM cc_files;
  INSERT INTO cc_files(filename,ekey) VALUES('test.zonefile','abcdefghij');
  SELECT quote(dd.v)==quote(cc.v) FROM cc JOIN dd USING (k)
} {0 0 0}

do_execsql_test 3.2.2 {
  SELECT rowid,sz FROM cc;
} {1000 44 1001 55 1002 66}

do_execsql_test 3.3 {
  UPDATE cc_files SET ekey = '0123456789';
  SELECT quote(dd.v)==quote(cc.v) FROM cc JOIN dd USING (k)
} {1 1 1}

close [open test.zonefile w+]
do_catchsql_test 3.4 {
  SELECT header FROM cc_files
} {1 {failed to read zonefile header from file "test.zonefile"}}

forcedelete test.zonefile
do_catchsql_test 3.5 {
  SELECT header FROM cc_files
} {1 {failed to open file "test.zonefile" for reading}}

do_execsql_test 3.6 {
  SELECT ekey FROM cc_files
} {{}}

forcedelete test.zonefile
do_catchsql_test 3.7 {
  SELECT * FROM cc;
} {1 {failed to open file "test.zonefile" for reading}}

#-------------------------------------------------------------------------
# Check that a file that uses an unknown compression method is handled
# correctly (an error is returned).
#
reset_db
load_static_extension db zonefile
do_execsql_test 4.0 {
  CREATE TABLE dd(k INTEGER PRIMARY KEY, frame INTEGER, idx INTEGER, v BLOB);
  INSERT INTO dd VALUES(1000, 1, -1, randomblob(44));
  INSERT INTO dd VALUES(1001, 1, -1, randomblob(55));
  INSERT INTO dd VALUES(1002, 2, -1, randomblob(66));
  SELECT zonefile_write('test.zonefile', 'dd');
  CREATE VIRTUAL TABLE x1 USING zonefile;
} {{}}

do_test 4.1 {
  hexio_write test.zonefile 5 77
} {1}
do_execsql_test 4.2 {
  INSERT INTO x1_files(filename) VALUES('test.zonefile');
} {}
do_catchsql_test 4.3 {
  SELECT * FROM x1
} {1 {unsupported compression method: 119}}
do_test 4.4 {
  hexio_write test.zonefile 4 77
} {1}
do_catchsql_test 4.5 {
  DELETE FROM x1_files;
  INSERT INTO x1_files(filename) VALUES('test.zonefile');
} {1 {unsupported compression method: 119}}

do_test 4.6 {
  hexio_write test.zonefile 0 00
} {1}
do_catchsql_test 4.7 {
  INSERT INTO x1_files(filename) VALUES('test.zonefile');
} {1 {failed to read zonefile header from file "test.zonefile"}}

#-------------------------------------------------------------------------
# Test using various types in the "frame" field of an input table.
#
reset_db
load_static_extension db zonefile
if {[lsearch $COMPRESSION_METHODS zlib]>=0} {
  do_execsql_test 5.0 {
    CREATE TABLE "a b"(k INTEGER PRIMARY KEY,frame INTEGER,idx INTEGER,v BLOB);
    INSERT INTO "a b" VALUES(1, 0.5, -1, randomblob(44));
    INSERT INTO "a b" VALUES(2, 0.5, -1, randomblob(55));
    INSERT INTO "a b" VALUES(3, 1.5, -1, randomblob(55));
    INSERT INTO "a b" VALUES(4, 1.5, -1, randomblob(55));
    INSERT INTO "a b" VALUES(5,   2, -1, randomblob(55));
    INSERT INTO "a b" VALUES(6,   2, -1, randomblob(55));
    INSERT INTO "a b" VALUES(7, 200, -1, randomblob(55));
    INSERT INTO "a b" VALUES(8, 200, -1, randomblob(55));
    INSERT INTO "a b" VALUES(9, 300, -1, randomblob(55));
    INSERT INTO "a b" VALUES(10, 300, -1, randomblob(55));
    INSERT INTO "a b" VALUES(11, NULL, -1, randomblob(55));
    INSERT INTO "a b" VALUES(12, NULL, -1, randomblob(55));
    INSERT INTO "a b" VALUES(13, 'f1', -1, randomblob(55));
    INSERT INTO "a b" VALUES(14, 'f1', -1, randomblob(55));
    INSERT INTO "a b" VALUES(15, 'frame2', -1, randomblob(55));
    INSERT INTO "a b" VALUES(16, 'frame2', -1, randomblob(55));
    INSERT INTO "a b" VALUES(17, x'1234', -1, randomblob(55));
    INSERT INTO "a b" VALUES(18, x'1234', -1, randomblob(55));
    INSERT INTO "a b" VALUES(19, x'abcd', -1, randomblob(55));
    INSERT INTO "a b" VALUES(20, x'abcd', -1, randomblob(55));
  
    SELECT zonefile_write('test.zonefile', 'a b',
      '{"compressionTypeContent":"zlib"}'
    );
  } {{}}

  do_execsql_test 5.1 {
    CREATE VIRTUAL TABLE abc USING zonefile; 
    INSERT INTO abc_files(filename) VALUES('test.zonefile');
    SELECT group_concat(k) FROM abc_shadow_idx GROUP BY fofst
  } {
    11,12   1,2   3,4   5,6   7,8  
     9,10  13,14 15,16 17,18 19,20
  }
}

do_execsql_test 6.0 {
  CREATE TABLE "ab"(k INTEGER PRIMARY KEY,frame INTEGER,idx INTEGER,v BLOB);
  INSERT INTO "ab" VALUES(1, 0.5, -1, randomblob(44));
  INSERT INTO "ab" VALUES(2, 0.5, -1, randomblob(55));
  INSERT INTO "ab" VALUES(3, 1.5, -1, randomblob(55));
  INSERT INTO "ab" VALUES(4, 1.5, -1, randomblob(55));
}
do_catchsql_test 6.1.1 {
  SELECT zonefile_write('test.zonefile', 'ab',
      '{"debugExtendedHeaderSize":-1}'
  );
} {1 {debugExtendedHeaderSize value out of range: -1}}
do_catchsql_test 6.1.2 {
  SELECT zonefile_write('test.zonefile', 'ab',
      '{"debugExtendedHeaderSize":256}'
  );
} {1 {debugExtendedHeaderSize value out of range: 256}}

do_catchsql_test 6.2 {
  SELECT zonefile_write('test.zonefile', 'ab',
      '{"unknown":256}'
  );
} {1 {unknown parameter name: "unknown"}}

forcedelete test.dir
file mkdir test.dir
do_catchsql_test 6.3 {
  SELECT zonefile_write('test.dir', 'ab');
} {1 {failed to open file "test.dir" for writing}}

do_catchsql_test 6.4 {
  CREATE VIRTUAL TABLE zzz USING zonefile;
  INSERT INTO zzz_files(filename) VALUES('nosuchfile.zonefile');
} {1 {failed to open file "nosuchfile.zonefile" for reading}}

if {$tcl_platform(platform)=="windows"} {
  do_catchsql_test 6.5 {
    INSERT INTO zzz_files(filename) VALUES('test.dir');
  } {1 {failed to open file "test.dir" for reading}}
} else {
  do_catchsql_test 6.5 {
    INSERT INTO zzz_files(filename) VALUES('test.dir');
  } {1 {failed to read zonefile header from file "test.dir"}}
}

#-------------------------------------------------------------------------
# Check that errors generated when building a dictionary are handled.
# The zstd library routines for building a dictionary throw an error
# if they are provided with too little data.
#
# Also test that zstd_global_dict cannot be used to compress the zonefile
# index (as there is nowhere in the file format to store the dictionary
# for this compression).
#
reset_db
load_static_extension db zonefile
if {[lsearch $COMPRESSION_METHODS zstd_global_dict]>=0} {
  do_execsql_test 7.0 {
    CREATE TABLE "ab"(k INTEGER PRIMARY KEY,frame INTEGER,idx INTEGER,v BLOB);
    INSERT INTO "ab" VALUES(1, -1, -1, 'abc');
  }

  do_catchsql_test 7.1 {
    SELECT zonefile_write('test.zonefile', 'ab',
      '{"compressionTypeContent":"zstd_global_dict"}'
    );
  } {1 {error generating dictionary}}

  do_catchsql_test 7.2 {
    SELECT zonefile_write('test.zonefile', 'ab',
      '{"compressionTypeIndexData":"zstd_global_dict"}'
    );
  } {1 {compressor "zstd_global_dict" may not be used to compress the zonefile index}}
}

#-------------------------------------------------------------------------
#
reset_db
load_static_extension db zonefile
do_catchsql_test 8.1 {
  CREATE VIRTUAL TABLE one USING zonefile_files;
} {1 {do not create zonefile_files tables directly!}}
do_catchsql_test 8.2 {
  CREATE VIRTUAL TABLE onetwothree USING zonefile_files;
} {1 {do not create zonefile_files tables directly!}}

#-------------------------------------------------------------------------
# A zone file containing zero keys.
#
reset_db
load_static_extension db zonefile
do_execsql_test 9.0 {
  CREATE TABLE s(k INTEGER PRIMARY KEY,frame INTEGER,idx INTEGER,v BLOB);
  SELECT zonefile_write('test.zonefile', 's');
} {{}}
do_execsql_test 9.1 {
  CREATE VIRTUAL TABLE ss USING zonefile;
  INSERT INTO ss_files(filename) VALUES('test.zonefile');
  SELECT * FROM ss;
} {}

#-------------------------------------------------------------------------
# Test UPDATE and DELETE statements on the %_files virtual table.
#
reset_db
load_static_extension db zonefile
do_execsql_test 10.0 {
  CREATE TABLE data(k INTEGER PRIMARY KEY, v BLOB);
  INSERT INTO data(k, v) VALUES(1, randomblob(100));
  INSERT INTO data(k, v) VALUES(2, randomblob(100));
  INSERT INTO data(k, v) VALUES(3, randomblob(100));
  INSERT INTO data(k, v) VALUES(4, randomblob(100));
  INSERT INTO data(k, v) VALUES(5, randomblob(100));
  INSERT INTO data(k, v) VALUES(6, randomblob(100));
  INSERT INTO data(k, v) VALUES(7, randomblob(100));
  INSERT INTO data(k, v) VALUES(8, randomblob(100));
  INSERT INTO data(k, v) VALUES(9, randomblob(100));

  CREATE VIEW v1 AS 
    SELECT k, -1 AS frame, -1 AS idx, v
    FROM data WHERE k IN (1,2,3);
  SELECT zonefile_write('test1.zonefile', 'v1');

  CREATE VIEW v2 AS 
    SELECT k, -1 AS frame, -1 AS idx, v
    FROM data WHERE k IN (4,5,6);
  SELECT zonefile_write('test2.zonefile', 'v2');

  CREATE VIEW v3 AS 
    SELECT k, -1 AS frame, -1 AS idx, v
    FROM data WHERE k IN (7,8,9);
  SELECT zonefile_write('test3.zonefile', 'v3');
} {{} {} {}}

do_execsql_test 10.1 {
  CREATE VIRTUAL TABLE "a b" USING zonefile;
  INSERT INTO "a b_files"(filename) VALUES('test1.zonefile');
  SELECT k FROM "a b"
} {1 2 3}

do_execsql_test 10.2 {
  UPDATE "a b_files" SET filename = 'test2.zonefile';
  SELECT k FROM "a b"
} {4 5 6}

do_execsql_test 10.3 {
  INSERT INTO "a b_files"(filename) VALUES('test1.zonefile');
  INSERT INTO "a b_files"(filename) VALUES('test3.zonefile');
  SELECT k FROM "a b"
} {1 2 3 4 5 6 7 8 9}

do_execsql_test 10.4 {
  DELETE FROM "a b_files" WHERE filename = 'test2.zonefile';
  SELECT k FROM "a b"
} {1 2 3 7 8 9}

do_execsql_test 10.5 {
  DELETE FROM "a b_files" WHERE filename = 'test1.zonefile';
  SELECT k FROM "a b"
} {7 8 9}

#-------------------------------------------------------------------------
#
reset_db
load_static_extension db zonefile
do_execsql_test 11.0 {
  CREATE TABLE data(k INTEGER PRIMARY KEY, v BLOB);
  INSERT INTO data(k, v) VALUES(-1, randomblob(100));
  INSERT INTO data(k, v) VALUES(1000, randomblob(100));
  INSERT INTO data(k, v) VALUES(-1000, randomblob(100));
  INSERT INTO data(k, v) VALUES(9223372036854775807, randomblob(100));
  INSERT INTO data(k, v) VALUES(-9223372036854775807, randomblob(100));
  INSERT INTO data(k, v) VALUES(-9223372036854775808, randomblob(100));

  CREATE VIEW v1 AS SELECT k, -1 AS frame, -1 AS idx, v FROM data;
  SELECT zonefile_write('test1.zonefile', 'v1');
} {{}}

do_execsql_test 11.1 {
  CREATE VIRTUAL TABLE one USING zonefile;
  INSERT INTO "one_files"(filename) VALUES('test1.zonefile');
  SELECT k FROM one
} {-9223372036854775808 -9223372036854775807 -1000 -1 1000 9223372036854775807}

do_execsql_test 11.2 {
  SELECT count(*) FROM data JOIN one USING (k) WHERE one.v==data.v
} 6

#-------------------------------------------------------------------------
#
do_catchsql_test 12.1 {
  CREATE VIRTUAL TABLE nm USING zonefile(abcd)
} {1 {parse error in option: abcd}}
do_catchsql_test 12.2 {
  CREATE VIRTUAL TABLE nm USING zonefile(a=b)
} {1 {parse error in option: a=b}}
do_catchsql_test 12.3 {
  CREATE VIRTUAL TABLE nm USING zonefile(cachesiza=b)
} {1 {parse error in option: cachesiza=b}}

#-------------------------------------------------------------------------
#
reset_db
load_static_extension db zonefile
do_execsql_test 13.0 {
  CREATE TABLE data(k INTEGER PRIMARY KEY, v BLOB);
  WITH s(i) AS (
    SELECT 1 UNION ALL SELECT i+1 FROM s WHERE i<250
  )
  INSERT INTO data SELECT i, randomblob(100) FROM s;
  CREATE VIEW v1 AS SELECT k, -1 AS frame, -1 AS idx, v FROM data;
  SELECT zonefile_write('test1.zonefile', 'v1');

  CREATE VIRTUAL TABLE nm USING zonefile;
  INSERT INTO nm_files(filename) VALUES('test1.zonefile');
} {{}}

foreach {tn cond} {
  1   "k > 30"
  2   "k >= 100"
  3   "k <= 100"
  4   "k < 55"
  5   "k LIKE '1%'"
  6   "k BETWEEN 10 AND 20"
  7   "k > 100 AND k < 200"
} {
  do_execsql_test 13.1.$tn.1 [subst {
    SELECT count(*) FROM nm WHERE $cond
  }] [db one "SELECT count(*) FROM data WHERE $cond"]

  do_execsql_test 13.1.$tn.2 [subst {
    SELECT count(*) FROM nm WHERE $cond AND
      v!=(SELECT v FROM data WHERE k=nm.k);
  }] 0
}

close [open test1.zonefile w+]
do_catchsql_test 13.2.1 {
  SELECT * FROM nm WHERE k=24;
} {1 {SQL logic error}}
forcedelete test1.zonefile
do_catchsql_test 13.2.2 {
  SELECT * FROM nm WHERE k=24;
} {1 {failed to open file "test1.zonefile" for reading}}

do_catchsql_test 13.3.1 {
  DELETE FROM nm_shadow_file;
  SELECT * FROM nm WHERE k=24;
} {1 {database disk image is malformed}}
do_catchsql_test 13.3.2 {
  DROP TABLE nm_shadow_file;
  SELECT * FROM nm WHERE k=24;
} {1 {no such table: main.nm_shadow_file}}
db close
sqlite3 db test.db
load_static_extension db zonefile
do_catchsql_test 13.3.3 {
  SELECT * FROM nm WHERE k=24;
} {1 {no such table: main.nm_shadow_file}}

#-------------------------------------------------------------------------
#
reset_db
load_static_extension db zonefile
do_execsql_test 14.0 {
  CREATE TABLE data(k INTEGER PRIMARY KEY, frame, idx, v BLOB);
  INSERT INTO data VALUES(1, 1, -1, randomblob(200));
  INSERT INTO data VALUES(2, 2, -1, randomblob(200));
  INSERT INTO data VALUES(3, 3, -1, randomblob(200));
  SELECT zonefile_write('test.zonefile', 'data',
  '{"encryptionType":"xor","encryptionKey":"pass","debugEncryptionKeyText":1}'
  );

  CREATE VIRTUAL TABLE nm USING zonefile(cachesize=2);
  INSERT INTO nm_files(filename,ekey) VALUES('test.zonefile','pass');
} {{}}

set i 0
foreach id {1 2 3 2 3 1} {
  do_execsql_test 14.1.$i {
    SELECT data.v=nm.v FROM data,nm WHERE data.k=$id AND nm.k=$id
  } 1
  incr i
}

if {[file exists /dev/null]} {
  do_catchsql_test 14.2 {
    INSERT INTO nm_files(filename) VALUES('/dev/null');
  } {1 {failed to read zonefile header from file "/dev/null"}}
}

finish_test

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# 2018 Feb 11
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# The focus of this file is testing the zonefile extension.
#

package require Tcl 8.6

if {![info exists testdir]} {
  set testdir [file join [file dirname [info script]] .. .. test]
}
source [file join $testdir tester.tcl]
set testprefix zonefileenc


foreach {tn code} {
  1 { 
    set K {
      braking bramble brambles brambly
      bran branch branched branches
      branching branchings brand branded
    }
    set textkey 1
  }
  2 {
    set K {
      5e008542742ce0442e37cbf2512e9492    c91c26e0573ca3464e037568c51126da
      e90e17489c1aef80ac620c9059271a5a    163338707cbe4c72b18d1058a42c5c78
      5c6b1e7c7c9e8e4a8d8fdc30dfc11bea    ff1012687828ecaac6c9ca86ea0f895e
      a203f25eb11d4c6afa841dfcf7cd0be0    b6c71e38ca914c460926ef90db39dba0
      b38255d031d026c258a0a41a9a75d46a    adccca5e5ffa3a7625144a345713aef0
      cd423b38b73e42ce5894405e6d0e08c0    b460ad2e370a0386726d6ea46e7b0bac
      503b81de72cb3ef87d9346a850040000    369c290a464a6b88bfd9d1c4755afd42
      a8a9343efca528f2bf23a972be49dd66    e366b5226bfe3fd0010fa814aae3b996
      4cad7e80124c2cd447131bae377e60f6    4a0fd2f054e1b08cad0de2dc6aa93246
      8a23c85e3337da2c97d498f806870fa8    8d14e1f055fd9bec7d07cf0e8baae042
      7f6954b0dc373028ab3b030aaf44dd58    d220164c3898435a946de6bcbb478cc4
      566af7ea88ba4ff87fd868e858cf98ea    a5405832235e8f601516f9c49767bdac
      1bd5b4dc6b54e5ca92ba67d20bf65740    59da30e203bf73840e38e108b83ddb82
      e516924c2cdf3114f10f2f0e1bdabbc6    b55dd27222a39764222838007e749984
      190ae9f81b86a5a024e3b97ee2a7121c    469660843a9a9e507d0fb43e92029296
      e6e600bc063aad12f6387beef650c48a    3097be5c3a52a2f00747587add01b550
    }
    set textkey 0
  }
} {
  reset_db
  load_static_extension db zonefile
  set nFile 100
  eval $code

  do_execsql_test 1.$tn.0 {
    CREATE TABLE zz(k INTEGER PRIMARY KEY, frame INTEGER, idx INTEGER, v BLOB);
    CREATE TABLE rr(k INTEGER PRIMARY KEY, v);
  }
  do_test 1.$tn.1 {
    for {set i 0} {$i < $nFile} {incr i} {
      set k [lindex $K [expr $i % [llength $K]]]
      execsql {
        DELETE FROM zz;
        INSERT INTO zz VALUES($i*10+1, 1, -1, randomblob(100));
        INSERT INTO zz VALUES($i*10+2, 2, -1, randomblob(100));
        INSERT INTO zz VALUES($i*10+3, 1, -1, randomblob(100));
        INSERT INTO rr SELECT k,v FROM zz;
  
        WITH p(n,v) AS (
            VALUES('encryptionType', 'xor') UNION ALL
            VALUES('debugEncryptionKeyText', $textkey) UNION ALL
            VALUES('encryptionKey', $k)
        )
        SELECT zonefile_write('test' || $i || '.zonefile', 'zz', 
            json_group_object(n, v)
        ) FROM p;
      }
    }
  } {}
  
  proc k {i} { 
    set val [lindex $::K [expr $i % [llength $::K]]]
    if {$::textkey==0} {
      return [binary decode hex $val]
    }
    return $val
  }
  db func k k
  
  do_execsql_test 1.$tn.2 {
    CREATE VIRTUAL TABLE gg USING zonefile;
  }
  for {set i 0} {$i < $nFile} {incr i} {
    do_execsql_test 1.$tn.2.$i { 
      INSERT INTO gg_files(filename, ekey) 
        VALUES('test' || $i || '.zonefile', k($i));
      SELECT count(*) FROM rr JOIN gg USING(k) WHERE rr.v!=gg.v;
    } 0
  }
  
  db close
  sqlite3 db test.db
  load_static_extension db zonefile
  db func k k
  
  do_catchsql_test 1.$tn.3 {
    SELECT count(*) FROM rr JOIN gg USING(k) WHERE rr.v!=gg.v;
  } {1 {missing encryption key for file "test0.zonefile"}}
  do_execsql_test 1.$tn.4 {
    UPDATE gg_files SET ekey = k(0) WHERE filename='test0.zonefile';
  }
  do_execsql_test 1.$tn.4.2 {
    SELECT count(*) FROM rr JOIN gg USING(k) 
      WHERE rr.v==gg.v AND k IN (1,2,3);
  } {3}
  do_catchsql_test 1.5 {
    SELECT count(*) FROM rr JOIN gg USING(k) WHERE rr.v!=gg.v;
  } {1 {missing encryption key for file "test1.zonefile"}}
  
  do_execsql_test 1.$tn.6 {
    UPDATE gg_files SET ekey = k(rowid-1);
  }
  do_execsql_test 1.$tn.7 {
    SELECT count(*) FROM rr JOIN gg USING(k) WHERE rr.v!=gg.v;
  } {0}
  do_execsql_test 1.$tn.8 {
    SELECT count(*) FROM rr JOIN gg USING(k) WHERE rr.v==gg.v;
  } {300}
  
  forcedelete test.db2
  do_execsql_test 1.$tn.9.1 {
    ATTACH 'test.db2' AS maing;
    CREATE VIRTUAL TABLE maing.g USING zonefile;
    INSERT INTO g_files(filename) SELECT filename FROM gg_files;
  }
  do_catchsql_test 1.$tn.9.2 {
    SELECT count(*) FROM rr JOIN g USING(k) WHERE rr.v!=g.v;
  } {1 {missing encryption key for file "test0.zonefile"}}
  do_execsql_test 1.$tn.9.3 {
    UPDATE g_files SET ekey = k(rowid-1);
    SELECT count(*) FROM rr JOIN g USING(k) WHERE rr.v==g.v;
  } {300}
  
  do_execsql_test 1.$tn.10 {
    SELECT count(*) FROM rr JOIN gg USING(k) WHERE rr.v==gg.v;
  } {300}
}
#-------------------------------------------------------------------------

reset_db
load_static_extension db zonefile

do_execsql_test 2.0 {
  CREATE TABLE zz(k INTEGER PRIMARY KEY, frame INTEGER, idx INTEGER, v BLOB);
}
foreach {tn alg id} {
  1 aes_128_ctr 1
  2 aes_128_cbc 2
  3 AES_256_CTR 3
  4 Aes_256_CBC 4
} {
  do_catchsql_test 2.1.$tn {
    WITH p(n,v) AS (
        VALUES('encryptionType', $alg) UNION ALL
        VALUES('debugEncryptionKeyText', 1) UNION ALL
        VALUES('encryptionKey', 'secret')
    )
    SELECT zonefile_write('test' || $i || '.zonefile', 'zz', 
        json_group_object(n, v)
    ) FROM p;
  } "1 {unsupported encryption method: $id}"
}

foreach {tn alg} {
  1 nosuchmethod! 
} {
  do_catchsql_test 2.2.$tn {
    WITH p(n,v) AS (
        VALUES('encryptionType', $alg) UNION ALL
        VALUES('debugEncryptionKeyText', 1) UNION ALL
        VALUES('encryptionKey', 'secret')
    )
    SELECT zonefile_write('test' || $i || '.zonefile', 'zz', 
        json_group_object(n, v)
    ) FROM p;
  } "1 {unknown encryption method: $alg}"
}

#-------------------------------------------------------------------------
# Test some hash collisions in the encryption key table.
#

# This is the same hash function used internally to store keys.
#
proc hash {zDb zTab iFile} {
  binary scan $zDb c*  A
    binary scan $zTab c* B
    set h 0
    foreach i $A { set h [expr ($h + ($h << 3) + $i) & 0xFFFFFFFF] }
  foreach i $B { set h [expr ($h + ($h << 3) + $i) & 0xFFFFFFFF] }
  return [expr $h ^ $iFile]
}

do_test 3.0 {
  set h1 [expr [hash main zone 1] % 512]
    for {set i 0} {1} {incr i} {
      set h2 [expr [hash "aux$i" zone 1] % 512]
        if {$h1==$h2} break
    }
  set i
} 52

reset_db
load_static_extension db zonefile
forcedelete test.db2

do_execsql_test 3.1 {
  CREATE TABLE zz(k INTEGER PRIMARY KEY, frame INTEGER, idx INTEGER, v BLOB);
  INSERT INTO zz VALUES(222, -1, -1, randomblob(60));
  WITH p(n,v) AS (
      VALUES('encryptionType', 'xor') UNION ALL
      VALUES('debugEncryptionKeyText', 1) UNION ALL
      VALUES('encryptionKey', 'pass')
  )
  SELECT zonefile_write('test1.zonefile', 'zz', 
      json_group_object(n, v)
  ) FROM p;

  DELETE FROM zz;
  INSERT INTO zz VALUES(333, -1, -1, randomblob(80));
  WITH p(n,v) AS (
      VALUES('encryptionType', 'xor') UNION ALL
      VALUES('debugEncryptionKeyText', 1) UNION ALL
      VALUES('encryptionKey', 'pass')
  )
  SELECT zonefile_write('test2.zonefile', 'zz', 
      json_group_object(n, v)
  ) FROM p;
} {{} {}}

do_execsql_test 3.2 {
  ATTACH 'test.db2' AS aux52;
  CREATE VIRTUAL TABLE main.zone USING zonefile;
  CREATE VIRTUAL TABLE aux52.zone USING zonefile;
  INSERT INTO main.zone_files(filename, ekey) VALUES('test1.zonefile', 'pass');
  INSERT INTO aux52.zone_files(filename, ekey) VALUES('test2.zonefile', 'pass');
}

do_execsql_test 3.3 {
  SELECT v IS NULL FROM main.zone;
  SELECT v IS NULL FROM aux52.zone;
} {0 0}

do_test 3.4 {
  set h1 [expr [hash main zone 1] % 512]
  for {set i 0} {1} {incr i} {
    set h2 [expr [hash "aux$i" zone 2] % 512]
    if {$h1==$h2} break
  }
  set i
} 682

forcedelete test.db3
do_execsql_test 3.5 {
  ATTACH 'test.db3' AS aux682;
  CREATE VIRTUAL TABLE aux682.zone USING zonefile;
  INSERT INTO aux682.zone_files(filename, ekey) VALUES('test1.zonefile','pass');
  INSERT INTO aux682.zone_files(filename, ekey) VALUES('test2.zonefile','pass');
  INSERT INTO main.zone_files(filename, ekey) VALUES('test2.zonefile','pass');
}

do_execsql_test 3.6 {
  SELECT v IS NULL FROM main.zone;
  SELECT v IS NULL FROM aux682.zone;
  SELECT v IS NULL FROM main.zone;
} {0 0 0 0 0 0}


finish_test

Added ext/zonefile/zonefilefault.test.























































































































































































































































































































































































































































































































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# 2018 Feb 11
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
#
# The focus of this file is testing the zonefile extension.
#

if {![info exists testdir]} {
  set testdir [file join [file dirname [info script]] .. .. test]
}
source [file join $testdir tester.tcl]
source [file join $testdir malloc_common.tcl]
set testprefix zonefilefault
load_static_extension db zonefile

do_execsql_test 1.0 {
  CREATE TABLE tt(k INTEGER PRIMARY KEY, frame INTEGER, idx INTEGER, v BLOB);
  INSERT INTO tt VALUES(1, -1, -1, randomblob(100));
  INSERT INTO tt VALUES(2, -1, -1, randomblob(200));
  INSERT INTO tt VALUES(3,  1, -1, randomblob(300));
  INSERT INTO tt VALUES(4,  2, -1, randomblob(400));
}

do_faultsim_test 1.1 -faults oom* -prep {
  sqlite3 db test.db
  load_static_extension db zonefile
} -body {
  execsql {
    SELECT zonefile_write('test.zonefile', 'tt',
        '{"encryptionType":"xor", "encryptionKey":"secret",
          "debugEncryptionKeyText":1
        }'
    );
  }
} -test {
  faultsim_test_result {0 {{}}}
}

set sql {
    SELECT zonefile_write('test.zonefile', 'tt',
        '{"compressionTypeContent":"zstd_global_dict"}'
    );
}
set HAVE_ZSTD 0
if {[catch { db eval $sql }]==0} {
  set HAVE_ZSTD 1
}

if {$HAVE_ZSTD} {
  do_faultsim_test 1.2 -faults oom* -prep {
    sqlite3 db test.db
    load_static_extension db zonefile
  } -body {
    execsql {
      SELECT zonefile_write('test.zonefile', 'tt',
          '{"compressionTypeContent":"zstd_global_dict"}'
      );
    }
  } -test {
    faultsim_test_result {0 {{}}}
  }
}

do_execsql_test 1.3.0 { UPDATE tt SET frame = NULL; }
do_faultsim_test 1.3 -faults oom* -prep {
  sqlite3 db test.db
  load_static_extension db zonefile
} -body {
  execsql {
    SELECT zonefile_write('test.zonefile', 'tt');
  }
} -test {
  faultsim_test_result {0 {{}}}
}

do_execsql_test 1.4.0 {
  INSERT INTO tt VALUES(5, -1, -1, randomblob(100));
  INSERT INTO tt VALUES(6, -1, -1, randomblob(100));
  INSERT INTO tt VALUES(7, -1, -1, randomblob(100));
  INSERT INTO tt VALUES(8, -1, -1, randomblob(100));
  INSERT INTO tt VALUES(9, -1, -1, randomblob(100));
  CREATE VIRTUAL TABLE ttz USING zonefile;
}
if {$HAVE_ZSTD} {
  faultsim_save_and_close
  do_faultsim_test 1.4 -faults oom* -prep {
    faultsim_restore_and_reopen
    load_static_extension db zonefile
  } -body {
    execsql {
      SELECT zonefile_write('test.zonefile', 'tt',
          '{"compressionTypeIndexData":"zstd"}'
      );
    }
  } -test {
    faultsim_test_result {0 {{}}}
  }

  faultsim_save_and_close
  do_faultsim_test 1.5 -faults oom* -prep {
    faultsim_restore_and_reopen
    load_static_extension db zonefile
  } -body {
    execsql {
      INSERT INTO ttz_files(filename) VALUES('test.zonefile');
    }
  } -test {
    faultsim_test_result {0 {}}
  }
}

#-------------------------------------------------------------------------
#
do_execsql_test 2.0 {
  SELECT zonefile_write('test.zonefile', 'tt',
      '{"encryptionType":"xor", "encryptionKey":"secret",
          "debugEncryptionKeyText":1
      }'
  );
  CREATE VIRTUAL TABLE zz USING zonefile;
} {{}}

faultsim_save_and_close
do_faultsim_test 2.1 -faults oom* -prep {
  faultsim_restore_and_reopen
  load_static_extension db zonefile
} -body {
  execsql {
    INSERT INTO zz_files(filename, ekey) VALUES('test.zonefile', 'secret')
  }
} -test {
  faultsim_test_result {0 {}}
}

faultsim_save_and_close
do_faultsim_test 2.2 -faults oom* -prep {
  faultsim_restore_and_reopen
  load_static_extension db zonefile
} -body {
  execsql { SELECT json_extract(header, '$.magicNumber') FROM zz_files }
} -test {
  faultsim_test_result {0 1179332920}
}

do_faultsim_test 2.3 -faults oom* -prep {
  faultsim_restore_and_reopen
  load_static_extension db zonefile
} -body {
  execsql { DELETE FROM zz_files }
} -test {
  faultsim_test_result {0 {}}
}

#-------------------------------------------------------------------------
#
reset_db
faultsim_save_and_close
do_faultsim_test 3.1 -faults oom* -prep {
  faultsim_restore_and_reopen
  load_static_extension db zonefile
} -body {
  execsql { CREATE VIRTUAL TABLE t1 USING zonefile(cachesize=5) }
} -test {
  faultsim_test_result {0 {}}
}

faultsim_save_and_close
do_faultsim_test 3.2 -faults oom* -prep {
  faultsim_restore_and_reopen
  load_static_extension db zonefile
} -body {
  execsql { DROP TABLE t1 }
} -test {
  faultsim_test_result {0 {}}
}

#-------------------------------------------------------------------------
#
reset_db
load_static_extension db zonefile
do_execsql_test 4.0 {
  CREATE TABLE zz(k INTEGER PRIMARY KEY, frame INTEGER, idx INTEGER, v BLOB);
  INSERT INTO zz VALUES(1, -1, -1, randomblob(100));
  INSERT INTO zz VALUES(2, -1, -1, randomblob(100));
  INSERT INTO zz VALUES(3, -1, -1, randomblob(100));
  SELECT zonefile_write('test.zonefile', 'zz');
  CREATE VIRTUAL TABLE zone USING zonefile;
  INSERT INTO zone_files(filename) VALUES('test.zonefile');
} {{}}

faultsim_save_and_close
do_faultsim_test 4.1 -faults oom* -prep {
  faultsim_restore_and_reopen
  load_static_extension db zonefile
} -body {
  execsql { SELECT v IS NULL FROM zone WHERE k = 2 }
} -test {
  faultsim_test_result {0 0}
}


if {$HAVE_ZSTD} {
  set params {
      {"encryptionType":"xor","encryptionKey":"pass",
       "compressionTypeContent":"zstd_global_dict",
          "debugEncryptionKeyText":1
      }
  }
} else {
  set params { 
      {"encryptionType":"xor","encryptionKey":"pass",
          "debugEncryptionKeyText":1
      }
  }
}
do_execsql_test 4.2 {
  SELECT zonefile_write('test.zonefile', 'zz', $params);
  CREATE VIRTUAL TABLE zone2 USING zonefile;
  INSERT INTO zone2_files(filename,ekey) VALUES('test.zonefile','pass');
} {{}}

faultsim_save_and_close
do_faultsim_test 4.3 -faults oom* -prep {
  faultsim_restore_and_reopen
  load_static_extension db zonefile
  execsql { UPDATE zone2_files SET ekey='pass' }
} -body {
  execsql { SELECT v IS NULL FROM zone2 WHERE k = 2 }
} -test {
  faultsim_test_result {0 0}
}

#-------------------------------------------------------------------------
reset_db
do_faultsim_test 4.4 -faults oom* -prep {
  faultsim_restore_and_reopen
} -body {
  load_static_extension db zonefile
} -test {
  faultsim_test_result {0 {}} {1 {initialization of zonefile failed: }}
}

finish_test

Changes to main.mk.

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  $(TOP)/ext/misc/series.c \
  $(TOP)/ext/misc/spellfix.c \
  $(TOP)/ext/misc/totype.c \
  $(TOP)/ext/misc/unionvtab.c \
  $(TOP)/ext/misc/wholenumber.c \
  $(TOP)/ext/misc/vfslog.c \
  $(TOP)/ext/misc/zipfile.c \

  $(TOP)/ext/fts5/fts5_tcl.c \
  $(TOP)/ext/fts5/fts5_test_mi.c \
  $(TOP)/ext/fts5/fts5_test_tok.c


#TESTSRC += $(TOP)/ext/fts2/fts2_tokenizer.c
#TESTSRC += $(TOP)/ext/fts3/fts3_tokenizer.c







>







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  $(TOP)/ext/misc/series.c \
  $(TOP)/ext/misc/spellfix.c \
  $(TOP)/ext/misc/totype.c \
  $(TOP)/ext/misc/unionvtab.c \
  $(TOP)/ext/misc/wholenumber.c \
  $(TOP)/ext/misc/vfslog.c \
  $(TOP)/ext/misc/zipfile.c \
  $(TOP)/ext/zonefile/zonefile.c \
  $(TOP)/ext/fts5/fts5_tcl.c \
  $(TOP)/ext/fts5/fts5_test_mi.c \
  $(TOP)/ext/fts5/fts5_test_tok.c


#TESTSRC += $(TOP)/ext/fts2/fts2_tokenizer.c
#TESTSRC += $(TOP)/ext/fts3/fts3_tokenizer.c

Changes to src/test1.c.

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....
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  extern int sqlite3_spellfix_init(sqlite3*,char**,const sqlite3_api_routines*);
  extern int sqlite3_totype_init(sqlite3*,char**,const sqlite3_api_routines*);
  extern int sqlite3_wholenumber_init(sqlite3*,char**,const sqlite3_api_routines*);
  extern int sqlite3_unionvtab_init(sqlite3*,char**,const sqlite3_api_routines*);
#ifdef SQLITE_HAVE_ZLIB
  extern int sqlite3_zipfile_init(sqlite3*,char**,const sqlite3_api_routines*);
#endif

  static const struct {
    const char *zExtName;
    int (*pInit)(sqlite3*,char**,const sqlite3_api_routines*);
  } aExtension[] = {
    { "amatch",                sqlite3_amatch_init               },
    { "carray",                sqlite3_carray_init               },
    { "closure",               sqlite3_closure_init              },
................................................................................
    { "spellfix",              sqlite3_spellfix_init             },
    { "totype",                sqlite3_totype_init               },
    { "unionvtab",             sqlite3_unionvtab_init            },
    { "wholenumber",           sqlite3_wholenumber_init          },
#ifdef SQLITE_HAVE_ZLIB
    { "zipfile",               sqlite3_zipfile_init              },
#endif

  };
  sqlite3 *db;
  const char *zName;
  int i, j, rc;
  char *zErrMsg = 0;
  if( objc<3 ){
    Tcl_WrongNumArgs(interp, 1, objv, "DB NAME ...");







>







 







>







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  extern int sqlite3_spellfix_init(sqlite3*,char**,const sqlite3_api_routines*);
  extern int sqlite3_totype_init(sqlite3*,char**,const sqlite3_api_routines*);
  extern int sqlite3_wholenumber_init(sqlite3*,char**,const sqlite3_api_routines*);
  extern int sqlite3_unionvtab_init(sqlite3*,char**,const sqlite3_api_routines*);
#ifdef SQLITE_HAVE_ZLIB
  extern int sqlite3_zipfile_init(sqlite3*,char**,const sqlite3_api_routines*);
#endif
  extern int sqlite3_zonefile_init(sqlite3*,char**,const sqlite3_api_routines*);
  static const struct {
    const char *zExtName;
    int (*pInit)(sqlite3*,char**,const sqlite3_api_routines*);
  } aExtension[] = {
    { "amatch",                sqlite3_amatch_init               },
    { "carray",                sqlite3_carray_init               },
    { "closure",               sqlite3_closure_init              },
................................................................................
    { "spellfix",              sqlite3_spellfix_init             },
    { "totype",                sqlite3_totype_init               },
    { "unionvtab",             sqlite3_unionvtab_init            },
    { "wholenumber",           sqlite3_wholenumber_init          },
#ifdef SQLITE_HAVE_ZLIB
    { "zipfile",               sqlite3_zipfile_init              },
#endif
    { "zonefile",              sqlite3_zonefile_init             },
  };
  sqlite3 *db;
  const char *zName;
  int i, j, rc;
  char *zErrMsg = 0;
  if( objc<3 ){
    Tcl_WrongNumArgs(interp, 1, objv, "DB NAME ...");