**
*************************************************************************
** This file contains code used for creating, destroying, and populating
** a VDBE (or an "sqlite3_stmt" as it is known to the outside world.)  Prior
** to version 2.8.7, all this code was combined into the vdbe.c source file.
** But that file was getting too big so this subroutines were split out.
**
** $Id: vdbeaux.c,v 1.472 2009/07/14 02:33:02 drh Exp $
*/
#include "sqliteInt.h"
#include "vdbeInt.h"



/*
................................................................................
  idx = getVarint32(aKey, szHdr);
  d = szHdr;
  u = 0;
  while( idx<szHdr && u<p->nField ){
    u32 serial_type;

    idx += getVarint32(&aKey[idx], serial_type);
    if( d>=nKey && sqlite3VdbeSerialTypeLen(serial_type)>0 ) break;
    pMem->enc = pKeyInfo->enc;
    pMem->db = pKeyInfo->db;
    pMem->flags = 0;
    pMem->zMalloc = 0;
    d += sqlite3VdbeSerialGet(&aKey[d], serial_type, pMem);
    pMem++;
    u++;
................................................................................
    rc = sqlite3MemCompare(&mem1, &pPKey2->aMem[i],
                           i<nField ? pKeyInfo->aColl[i] : 0);
    if( rc!=0 ){
      break;
    }
    i++;
  }


  if( mem1.zMalloc ) sqlite3VdbeMemRelease(&mem1);

  /* If the PREFIX_SEARCH flag is set and all fields except the final
  ** rowid field were equal, then clear the PREFIX_SEARCH flag and set 
  ** pPKey2->rowid to the value of the rowid field in (pKey1, nKey1).
  ** This is used by the OP_IsUnique opcode.
  */
  if( (pPKey2->flags & UNPACKED_PREFIX_SEARCH) && i==(pPKey2->nField-1) ){
................................................................................
){
  i64 nCellKey = 0;
  int rc;
  BtCursor *pCur = pC->pCursor;
  Mem m;

  sqlite3BtreeKeySize(pCur, &nCellKey);


  if( nCellKey<=0 || nCellKey>0x7fffffff ){
    *res = 0;
    return SQLITE_OK;
  }
  m.db = 0;
  m.flags = 0;
  m.zMalloc = 0;
  rc = sqlite3VdbeMemFromBtree(pC->pCursor, 0, (int)nCellKey, 1, &m);
  if( rc ){
    return rc;

**
*************************************************************************
** This file contains code used for creating, destroying, and populating
** a VDBE (or an "sqlite3_stmt" as it is known to the outside world.)  Prior
** to version 2.8.7, all this code was combined into the vdbe.c source file.
** But that file was getting too big so this subroutines were split out.
**
** $Id: vdbeaux.c,v 1.473 2009/07/14 14:15:27 drh Exp $
*/
#include "sqliteInt.h"
#include "vdbeInt.h"



/*
................................................................................
  idx = getVarint32(aKey, szHdr);
  d = szHdr;
  u = 0;
  while( idx<szHdr && u<p->nField ){
    u32 serial_type;

    idx += getVarint32(&aKey[idx], serial_type);
    assert( d+sqlite3VdbeSerialTypeLen(serial_type) <= nKey );
    pMem->enc = pKeyInfo->enc;
    pMem->db = pKeyInfo->db;
    pMem->flags = 0;
    pMem->zMalloc = 0;
    d += sqlite3VdbeSerialGet(&aKey[d], serial_type, pMem);
    pMem++;
    u++;
................................................................................
    rc = sqlite3MemCompare(&mem1, &pPKey2->aMem[i],
                           i<nField ? pKeyInfo->aColl[i] : 0);
    if( rc!=0 ){
      break;
    }
    i++;
  }

  /* No memory allocation is ever used on mem1. */
  if( NEVER(mem1.zMalloc) ) sqlite3VdbeMemRelease(&mem1);

  /* If the PREFIX_SEARCH flag is set and all fields except the final
  ** rowid field were equal, then clear the PREFIX_SEARCH flag and set 
  ** pPKey2->rowid to the value of the rowid field in (pKey1, nKey1).
  ** This is used by the OP_IsUnique opcode.
  */
  if( (pPKey2->flags & UNPACKED_PREFIX_SEARCH) && i==(pPKey2->nField-1) ){
................................................................................
){
  i64 nCellKey = 0;
  int rc;
  BtCursor *pCur = pC->pCursor;
  Mem m;

  sqlite3BtreeKeySize(pCur, &nCellKey);
  /* nCellKey will always be between 0 and 0xffffffff because of the say
  ** that btreeParseCellPtr() and sqlite3GetVarint32() are implemented */
  if( NEVER(nCellKey<=0) || nCellKey>0x7fffffff ){
    *res = 0;
    return SQLITE_CORRUPT;
  }
  m.db = 0;
  m.flags = 0;
  m.zMalloc = 0;
  rc = sqlite3VdbeMemFromBtree(pC->pCursor, 0, (int)nCellKey, 1, &m);
  if( rc ){
    return rc;