/ Check-in [17c4235c]
Login
Home Timeline Branches Tags Tickets Wiki More...

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Introduce the (experimental) sqlite3_result_error_toobig() API that function implementations can use to signal SQLite that the function result is too big to represent. (CVS 3949)
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 17c4235c492f746867c1d2b8621043b93f8aa10e
User & Date: drh 2007-05-08 15:15:02
Context
2007-05-08
15:34
Limit the length of the patterns on LIKE and GLOB to avoid problems with deep recursion and N^2 behavior. (CVS 3950) check-in: 42e6c826 user: drh tags: trunk
15:15
Introduce the (experimental) sqlite3_result_error_toobig() API that function implementations can use to signal SQLite that the function result is too big to represent. (CVS 3949) check-in: 17c4235c user: drh tags: trunk
14:51
Add the max_page_count pragma used to limit the maximum size of a database file. Untested. (CVS 3948) check-in: b1b74f06 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/date.c. 

12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
...
770
771
772
773
774
775
776

777
778
779
780
781
782
783
784
...
810
811
812
813
814
815
816



817
818
819
820
821
822
823

** This file contains the C functions that implement date and time
** functions for SQLite.  
**
** There is only one exported symbol in this file - the function
** sqlite3RegisterDateTimeFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: date.c,v 1.64 2007/05/04 13:15:56 drh Exp $
**
** NOTES:
**
** SQLite processes all times and dates as Julian Day numbers.  The
** dates and times are stored as the number of days since noon
** in Greenwich on November 24, 4714 B.C. according to the Gregorian
** calendar system. 
................................................................................
*/
static void strftimeFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  DateTime x;

  int n, i, j;
  char *z;
  const char *zFmt = (const char*)sqlite3_value_text(argv[0]);
  char zBuf[100];
  if( zFmt==0 || isDate(argc-1, argv+1, &x) ) return;
  for(i=0, n=1; zFmt[i]; i++, n++){
    if( zFmt[i]=='%' ){
      switch( zFmt[i+1] ){
................................................................................
          return;  /* ERROR.  return a NULL */
      }
      i++;
    }
  }
  if( n<sizeof(zBuf) ){
    z = zBuf;



  }else{
    z = sqliteMalloc( n );
    if( z==0 ) return;
  }
  computeJD(&x);
  computeYMD_HMS(&x);
  for(i=j=0; zFmt[i]; i++){








|







 







>
|







 







>
>
>








12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
...
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
...
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827

** This file contains the C functions that implement date and time
** functions for SQLite.  
**
** There is only one exported symbol in this file - the function
** sqlite3RegisterDateTimeFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: date.c,v 1.65 2007/05/08 15:15:02 drh Exp $
**
** NOTES:
**
** SQLite processes all times and dates as Julian Day numbers.  The
** dates and times are stored as the number of days since noon
** in Greenwich on November 24, 4714 B.C. according to the Gregorian
** calendar system. 
................................................................................
*/
static void strftimeFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  DateTime x;
  u64 n;
  int i, j;
  char *z;
  const char *zFmt = (const char*)sqlite3_value_text(argv[0]);
  char zBuf[100];
  if( zFmt==0 || isDate(argc-1, argv+1, &x) ) return;
  for(i=0, n=1; zFmt[i]; i++, n++){
    if( zFmt[i]=='%' ){
      switch( zFmt[i+1] ){
................................................................................
          return;  /* ERROR.  return a NULL */
      }
      i++;
    }
  }
  if( n<sizeof(zBuf) ){
    z = zBuf;
  }else if( n>SQLITE_MAX_LENGTH ){
    sqlite3_result_error_toobig(context);
    return;
  }else{
    z = sqliteMalloc( n );
    if( z==0 ) return;
  }
  computeJD(&x);
  computeYMD_HMS(&x);
  for(i=j=0; zFmt[i]; i++){

Changes to src/func.c. 

12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
...
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
...
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
...
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
...
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
...
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774

** This file contains the C functions that implement various SQL
** functions of SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.148 2007/05/08 14:39:04 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
/* #include <math.h> */
#include <stdlib.h>
#include <assert.h>
#include "vdbeInt.h"
................................................................................
  unsigned char *p;
  assert( argc==1 );
  n = sqlite3_value_int(argv[0]);
  if( n<1 ){
    n = 1;
  }
  if( n>SQLITE_MAX_LENGTH ){
    sqlite3_result_error(context, "randomblob() too large", -1);
    return;
  }
  p = sqliteMalloc(n);
  if( p ){
    sqlite3Randomness(n, p);
    sqlite3_result_blob(context, (char*)p, n, sqlite3FreeX);
  }
................................................................................
    }
    case SQLITE_BLOB: {
      char *zText = 0;
      int nBlob = sqlite3_value_bytes(argv[0]);
      char const *zBlob = sqlite3_value_blob(argv[0]);

      if( 2*nBlob+4>SQLITE_MAX_LENGTH ){
        sqlite3_result_error(context, "BLOB too big to quote", -1);
        return;
      }
      zText = (char *)sqliteMalloc((2*nBlob)+4); 
      if( !zText ){
        sqlite3_result_error(context, "out of memory", -1);
      }else{
        int i;
................................................................................
      u64 n;
      const unsigned char *zArg = sqlite3_value_text(argv[0]);
      char *z;

      if( zArg==0 ) return;
      for(i=0, n=0; zArg[i]; i++){ if( zArg[i]=='\'' ) n++; }
      if( i+n+3>SQLITE_MAX_LENGTH ){
        sqlite3_result_error(context, "string too big to quote", -1);
        return;
      }
      z = sqliteMalloc( i+n+3 );
      if( z==0 ) return;
      z[0] = '\'';
      for(i=0, j=1; zArg[i]; i++){
        z[j++] = zArg[i];
................................................................................
){
  int i, n;
  const unsigned char *pBlob;
  char *zHex, *z;
  assert( argc==1 );
  n = sqlite3_value_bytes(argv[0]);
  if( n*2+1>SQLITE_MAX_LENGTH ){
    sqlite3_result_error(context, "BLOB too big to convert to hex", -1);
    return;
  }
  pBlob = sqlite3_value_blob(argv[0]);
  z = zHex = sqlite3_malloc(n*2 + 1);
  if( zHex==0 ) return;
  for(i=0; i<n; i++, pBlob++){
    unsigned char c = *pBlob;
................................................................................
  if( zOut==0 ) return;
  loopLimit = nStr - nPattern;  
  for(i=j=0; i<=loopLimit; i++){
    if( zStr[i]!=zPattern[0] || memcmp(&zStr[i], zPattern, nPattern) ){
      zOut[j++] = zStr[i];
    }else{
      if( (j+nRep+loopLimit-i)>SQLITE_MAX_LENGTH ){
        sqlite3_result_error(context, "replace() is too large", -1);
        sqlite3_free(zOut);
        return;
      }
      memcpy(&zOut[j], zRep, nRep);
      j += nRep;
      i += nPattern-1;
    }








|







 







|







 







|







 







|







 







|







 







|








12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
...
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
...
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
...
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
...
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
...
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774

** This file contains the C functions that implement various SQL
** functions of SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.149 2007/05/08 15:15:02 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
/* #include <math.h> */
#include <stdlib.h>
#include <assert.h>
#include "vdbeInt.h"
................................................................................
  unsigned char *p;
  assert( argc==1 );
  n = sqlite3_value_int(argv[0]);
  if( n<1 ){
    n = 1;
  }
  if( n>SQLITE_MAX_LENGTH ){
    sqlite3_result_error_toobig(context);
    return;
  }
  p = sqliteMalloc(n);
  if( p ){
    sqlite3Randomness(n, p);
    sqlite3_result_blob(context, (char*)p, n, sqlite3FreeX);
  }
................................................................................
    }
    case SQLITE_BLOB: {
      char *zText = 0;
      int nBlob = sqlite3_value_bytes(argv[0]);
      char const *zBlob = sqlite3_value_blob(argv[0]);

      if( 2*nBlob+4>SQLITE_MAX_LENGTH ){
        sqlite3_result_error_toobig(context);
        return;
      }
      zText = (char *)sqliteMalloc((2*nBlob)+4); 
      if( !zText ){
        sqlite3_result_error(context, "out of memory", -1);
      }else{
        int i;
................................................................................
      u64 n;
      const unsigned char *zArg = sqlite3_value_text(argv[0]);
      char *z;

      if( zArg==0 ) return;
      for(i=0, n=0; zArg[i]; i++){ if( zArg[i]=='\'' ) n++; }
      if( i+n+3>SQLITE_MAX_LENGTH ){
        sqlite3_result_error_toobig(context);
        return;
      }
      z = sqliteMalloc( i+n+3 );
      if( z==0 ) return;
      z[0] = '\'';
      for(i=0, j=1; zArg[i]; i++){
        z[j++] = zArg[i];
................................................................................
){
  int i, n;
  const unsigned char *pBlob;
  char *zHex, *z;
  assert( argc==1 );
  n = sqlite3_value_bytes(argv[0]);
  if( n*2+1>SQLITE_MAX_LENGTH ){
    sqlite3_result_error_toobig(context);
    return;
  }
  pBlob = sqlite3_value_blob(argv[0]);
  z = zHex = sqlite3_malloc(n*2 + 1);
  if( zHex==0 ) return;
  for(i=0; i<n; i++, pBlob++){
    unsigned char c = *pBlob;
................................................................................
  if( zOut==0 ) return;
  loopLimit = nStr - nPattern;  
  for(i=j=0; i<=loopLimit; i++){
    if( zStr[i]!=zPattern[0] || memcmp(&zStr[i], zPattern, nPattern) ){
      zOut[j++] = zStr[i];
    }else{
      if( (j+nRep+loopLimit-i)>SQLITE_MAX_LENGTH ){
        sqlite3_result_error_toobig(context);
        sqlite3_free(zOut);
        return;
      }
      memcpy(&zOut[j], zRep, nRep);
      j += nRep;
      i += nPattern-1;
    }

Changes to src/limits.h. 

8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** 
** This file defines various limits of what SQLite can process.
**
** @(#) $Id: limits.h,v 1.3 2007/05/08 14:51:37 drh Exp $
*/

/*
** The maximum length of a TEXT or BLOB in bytes.   This also
** limits the size of a row in a table or index.
**
** The hard limit is the ability of a 32-bit signed integer








|








8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** 
** This file defines various limits of what SQLite can process.
**
** @(#) $Id: limits.h,v 1.4 2007/05/08 15:15:02 drh Exp $
*/

/*
** The maximum length of a TEXT or BLOB in bytes.   This also
** limits the size of a row in a table or index.
**
** The hard limit is the ability of a 32-bit signed integer

Changes to src/sqlite.h.in. 

8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
....
1220
1221
1222
1223
1224
1225
1226

1227
1228
1229
1230
1231
1232
1233

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the SQLite library
** presents to client programs.
**
** @(#) $Id: sqlite.h.in,v 1.207 2007/05/08 01:08:49 drh Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
................................................................................
void sqlite3_result_null(sqlite3_context*);
void sqlite3_result_text(sqlite3_context*, const char*, int, void(*)(void*));
void sqlite3_result_text16(sqlite3_context*, const void*, int, void(*)(void*));
void sqlite3_result_text16le(sqlite3_context*, const void*, int,void(*)(void*));
void sqlite3_result_text16be(sqlite3_context*, const void*, int,void(*)(void*));
void sqlite3_result_value(sqlite3_context*, sqlite3_value*);
void sqlite3_result_zeroblob(sqlite3_context*, int n);


/*
** These are the allowed values for the eTextRep argument to
** sqlite3_create_collation and sqlite3_create_function.
*/
#define SQLITE_UTF8           1
#define SQLITE_UTF16LE        2








|







 







>








8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
....
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234

**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
** This header file defines the interface that the SQLite library
** presents to client programs.
**
** @(#) $Id: sqlite.h.in,v 1.208 2007/05/08 15:15:02 drh Exp $
*/
#ifndef _SQLITE3_H_
#define _SQLITE3_H_
#include <stdarg.h>     /* Needed for the definition of va_list */

/*
** Make sure we can call this stuff from C++.
................................................................................
void sqlite3_result_null(sqlite3_context*);
void sqlite3_result_text(sqlite3_context*, const char*, int, void(*)(void*));
void sqlite3_result_text16(sqlite3_context*, const void*, int, void(*)(void*));
void sqlite3_result_text16le(sqlite3_context*, const void*, int,void(*)(void*));
void sqlite3_result_text16be(sqlite3_context*, const void*, int,void(*)(void*));
void sqlite3_result_value(sqlite3_context*, sqlite3_value*);
void sqlite3_result_zeroblob(sqlite3_context*, int n);
void sqlite3_result_error_toobig(sqlite3_context*);

/*
** These are the allowed values for the eTextRep argument to
** sqlite3_create_collation and sqlite3_create_function.
*/
#define SQLITE_UTF8           1
#define SQLITE_UTF16LE        2

Changes to src/vdbeapi.c. 

151
152
153
154
155
156
157





158
159
160
161
162
163
164

#endif /* SQLITE_OMIT_UTF16 */
void sqlite3_result_value(sqlite3_context *pCtx, sqlite3_value *pValue){
  sqlite3VdbeMemCopy(&pCtx->s, pValue);
}
void sqlite3_result_zeroblob(sqlite3_context *pCtx, int n){
  sqlite3VdbeMemSetZeroBlob(&pCtx->s, n);
}







/*
** Execute the statement pStmt, either until a row of data is ready, the
** statement is completely executed or an error occurs.
**
** This routine implements the bulk of the logic behind the sqlite_step()








>
>
>
>
>








151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169

#endif /* SQLITE_OMIT_UTF16 */
void sqlite3_result_value(sqlite3_context *pCtx, sqlite3_value *pValue){
  sqlite3VdbeMemCopy(&pCtx->s, pValue);
}
void sqlite3_result_zeroblob(sqlite3_context *pCtx, int n){
  sqlite3VdbeMemSetZeroBlob(&pCtx->s, n);
}

/* Force an SQLITE_TOOBIG error. */
void sqlite3_result_error_toobig(sqlite3_context *pCtx){
  sqlite3VdbeMemSetZeroBlob(&pCtx->s, SQLITE_MAX_LENGTH+1);
}


/*
** Execute the statement pStmt, either until a row of data is ready, the
** statement is completely executed or an error occurs.
**
** This routine implements the bulk of the logic behind the sqlite_step()

This page was generated in about 0.057s by Fossil 2.9 [5b6be64760] 2019-06-14 00:24:04