--- a/engine/sqlite/src/vdbemem.cpp Wed Apr 28 13:20:05 2010 +0100
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1016 +0,0 @@
-/*
-** 2004 May 26
-**
-** 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.
-**
-*************************************************************************
-**
-** This file contains code use to manipulate "Mem" structure. A "Mem"
-** stores a single value in the VDBE. Mem is an opaque structure visible
-** only within the VDBE. Interface routines refer to a Mem using the
-** name sqlite_value
-*/
-#include "sqliteInt.h"
-#include <ctype.h>
-#include "vdbeInt.h"
-
-/*
-** Call sqlite3VdbeMemExpandBlob() on the supplied value (type Mem*)
-** P if required.
-*/
-#define expandBlob(P) (((P)->flags&MEM_Zero)?sqlite3VdbeMemExpandBlob(P):0)
-
-/*
-** If pMem is an object with a valid string representation, this routine
-** ensures the internal encoding for the string representation is
-** 'desiredEnc', one of SQLITE_UTF8, SQLITE_UTF16LE or SQLITE_UTF16BE.
-**
-** If pMem is not a string object, or the encoding of the string
-** representation is already stored using the requested encoding, then this
-** routine is a no-op.
-**
-** SQLITE_OK is returned if the conversion is successful (or not required).
-** SQLITE_NOMEM may be returned if a malloc() fails during conversion
-** between formats.
-*/
-int sqlite3VdbeChangeEncoding(Mem *pMem, int desiredEnc){
- int rc;
- if( !(pMem->flags&MEM_Str) || pMem->enc==desiredEnc ){
- return SQLITE_OK;
- }
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
-#ifdef SQLITE_OMIT_UTF16
- return SQLITE_ERROR;
-#else
-
- /* MemTranslate() may return SQLITE_OK or SQLITE_NOMEM. If NOMEM is returned,
- ** then the encoding of the value may not have changed.
- */
- rc = sqlite3VdbeMemTranslate(pMem, desiredEnc);
- assert(rc==SQLITE_OK || rc==SQLITE_NOMEM);
- assert(rc==SQLITE_OK || pMem->enc!=desiredEnc);
- assert(rc==SQLITE_NOMEM || pMem->enc==desiredEnc);
- return rc;
-#endif
-}
-
-/*
-** Make the given Mem object MEM_Dyn.
-**
-** Return SQLITE_OK on success or SQLITE_NOMEM if malloc fails.
-*/
-int sqlite3VdbeMemDynamicify(Mem *pMem){
- int n;
- u8 *z;
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- expandBlob(pMem);
- if( (pMem->flags & (MEM_Ephem|MEM_Static|MEM_Short))==0 ){
- return SQLITE_OK;
- }
- assert( (pMem->flags & MEM_Dyn)==0 );
- n = pMem->n;
- assert( pMem->flags & (MEM_Str|MEM_Blob) );
- z = (u8*)sqlite3DbMallocRaw(pMem->db, n+2 );
- if( z==0 ){
- return SQLITE_NOMEM;
- }
- pMem->flags |= MEM_Dyn|MEM_Term;
- pMem->xDel = 0;
- memcpy(z, pMem->z, n );
- z[n] = 0;
- z[n+1] = 0;
- pMem->z = (char*)z;
- pMem->flags &= ~(MEM_Ephem|MEM_Static|MEM_Short);
- return SQLITE_OK;
-}
-
-/*
-** If the given Mem* has a zero-filled tail, turn it into an ordinary
-** blob stored in dynamically allocated space.
-*/
-#ifndef SQLITE_OMIT_INCRBLOB
-int sqlite3VdbeMemExpandBlob(Mem *pMem){
- if( pMem->flags & MEM_Zero ){
- char *pNew;
- int nByte;
- assert( (pMem->flags & MEM_Blob)!=0 );
- nByte = pMem->n + pMem->u.i;
- if( nByte<=0 ) nByte = 1;
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- pNew = (char*)sqlite3DbMallocRaw(pMem->db, nByte);
- if( pNew==0 ){
- return SQLITE_NOMEM;
- }
- memcpy(pNew, pMem->z, pMem->n);
- memset(&pNew[pMem->n], 0, pMem->u.i);
- sqlite3VdbeMemRelease(pMem);
- pMem->z = pNew;
- pMem->n += pMem->u.i;
- pMem->u.i = 0;
- pMem->flags &= ~(MEM_Zero|MEM_Static|MEM_Ephem|MEM_Short|MEM_Term);
- pMem->flags |= MEM_Dyn;
- }
- return SQLITE_OK;
-}
-#endif
-
-
-/*
-** Make the given Mem object either MEM_Short or MEM_Dyn so that bytes
-** of the Mem.z[] array can be modified.
-**
-** Return SQLITE_OK on success or SQLITE_NOMEM if malloc fails.
-*/
-int sqlite3VdbeMemMakeWriteable(Mem *pMem){
- int n;
- u8 *z;
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- expandBlob(pMem);
- if( (pMem->flags & (MEM_Ephem|MEM_Static))==0 ){
- return SQLITE_OK;
- }
- assert( (pMem->flags & MEM_Dyn)==0 );
- assert( pMem->flags & (MEM_Str|MEM_Blob) );
- if( (n = pMem->n)+2<sizeof(pMem->zShort) ){
- z = (u8*)pMem->zShort;
- pMem->flags |= MEM_Short|MEM_Term;
- }else{
- z = (u8*)sqlite3DbMallocRaw(pMem->db, n+2 );
- if( z==0 ){
- return SQLITE_NOMEM;
- }
- pMem->flags |= MEM_Dyn|MEM_Term;
- pMem->xDel = 0;
- }
- memcpy(z, pMem->z, n );
- z[n] = 0;
- z[n+1] = 0;
- pMem->z = (char*)z;
- pMem->flags &= ~(MEM_Ephem|MEM_Static);
- assert(0==(1&(int)pMem->z));
- return SQLITE_OK;
-}
-
-/*
-** Make sure the given Mem is \u0000 terminated.
-*/
-int sqlite3VdbeMemNulTerminate(Mem *pMem){
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- if( (pMem->flags & MEM_Term)!=0 || (pMem->flags & MEM_Str)==0 ){
- return SQLITE_OK; /* Nothing to do */
- }
- if( pMem->flags & (MEM_Static|MEM_Ephem) ){
- return sqlite3VdbeMemMakeWriteable(pMem);
- }else{
- char *z;
- sqlite3VdbeMemExpandBlob(pMem);
- z = (char*)sqlite3DbMallocRaw(pMem->db, pMem->n+2);
- if( !z ){
- return SQLITE_NOMEM;
- }
- memcpy(z, pMem->z, pMem->n);
- z[pMem->n] = 0;
- z[pMem->n+1] = 0;
- if( pMem->xDel ){
- pMem->xDel(pMem->z);
- }else{
- sqlite3_free(pMem->z);
- }
- pMem->xDel = 0;
- pMem->z = z;
- pMem->flags |= MEM_Term;
- }
- return SQLITE_OK;
-}
-
-/*
-** Add MEM_Str to the set of representations for the given Mem. Numbers
-** are converted using sqlite3_snprintf(). Converting a BLOB to a string
-** is a no-op.
-**
-** Existing representations MEM_Int and MEM_Real are *not* invalidated.
-**
-** A MEM_Null value will never be passed to this function. This function is
-** used for converting values to text for returning to the user (i.e. via
-** sqlite3_value_text()), or for ensuring that values to be used as btree
-** keys are strings. In the former case a NULL pointer is returned the
-** user and the later is an internal programming error.
-*/
-int sqlite3VdbeMemStringify(Mem *pMem, int enc){
- int rc = SQLITE_OK;
- int fg = pMem->flags;
- char *z = pMem->zShort;
-
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- assert( !(fg&MEM_Zero) );
- assert( !(fg&(MEM_Str|MEM_Blob)) );
- assert( fg&(MEM_Int|MEM_Real) );
-
- /* For a Real or Integer, use sqlite3_snprintf() to produce the UTF-8
- ** string representation of the value. Then, if the required encoding
- ** is UTF-16le or UTF-16be do a translation.
- **
- ** FIX ME: It would be better if sqlite3_snprintf() could do UTF-16.
- */
- if( fg & MEM_Int ){
- sqlite3_snprintf(NBFS, z, "%lld", pMem->u.i);
- }else{
- assert( fg & MEM_Real );
- sqlite3_snprintf(NBFS, z, "%!.15g", pMem->r);
- }
- pMem->n = strlen(z);
- pMem->z = z;
- pMem->enc = SQLITE_UTF8;
- pMem->flags |= MEM_Str | MEM_Short | MEM_Term;
- sqlite3VdbeChangeEncoding(pMem, enc);
- return rc;
-}
-
-/*
-** Memory cell pMem contains the context of an aggregate function.
-** This routine calls the finalize method for that function. The
-** result of the aggregate is stored back into pMem.
-**
-** Return SQLITE_ERROR if the finalizer reports an error. SQLITE_OK
-** otherwise.
-*/
-int sqlite3VdbeMemFinalize(Mem *pMem, FuncDef *pFunc){
- int rc = SQLITE_OK;
- if( pFunc && pFunc->xFinalize ){
- sqlite3_context ctx;
- assert( (pMem->flags & MEM_Null)!=0 || pFunc==pMem->u.pDef );
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- ctx.s.flags = MEM_Null;
- ctx.s.z = pMem->zShort;
- ctx.s.db = pMem->db;
- ctx.pMem = pMem;
- ctx.pFunc = pFunc;
- ctx.isError = 0;
- pFunc->xFinalize(&ctx);
- if( pMem->z && pMem->z!=pMem->zShort ){
- sqlite3_free( pMem->z );
- }
- *pMem = ctx.s;
- if( pMem->flags & MEM_Short ){
- pMem->z = pMem->zShort;
- }
- rc = (ctx.isError?SQLITE_ERROR:SQLITE_OK);
- }
- return rc;
-}
-
-/*
-** Release any memory held by the Mem. This may leave the Mem in an
-** inconsistent state, for example with (Mem.z==0) and
-** (Mem.type==SQLITE_TEXT).
-*/
-void sqlite3VdbeMemRelease(Mem *p){
- assert( p->db==0 || sqlite3_mutex_held(p->db->mutex) );
- if( p->flags & (MEM_Dyn|MEM_Agg) ){
- if( p->xDel ){
- if( p->flags & MEM_Agg ){
- sqlite3VdbeMemFinalize(p, p->u.pDef);
- assert( (p->flags & MEM_Agg)==0 );
- sqlite3VdbeMemRelease(p);
- }else{
- p->xDel((void *)p->z);
- }
- }else{
- sqlite3_free(p->z);
- }
- p->z = 0;
- p->xDel = 0;
- }
-}
-
-/*
-** Return some kind of integer value which is the best we can do
-** at representing the value that *pMem describes as an integer.
-** If pMem is an integer, then the value is exact. If pMem is
-** a floating-point then the value returned is the integer part.
-** If pMem is a string or blob, then we make an attempt to convert
-** it into a integer and return that. If pMem is NULL, return 0.
-**
-** If pMem is a string, its encoding might be changed.
-*/
-i64 sqlite3VdbeIntValue(Mem *pMem){
- int flags;
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- flags = pMem->flags;
- if( flags & MEM_Int ){
- return pMem->u.i;
- }else if( flags & MEM_Real ){
- return (i64)pMem->r;
- }else if( flags & (MEM_Str|MEM_Blob) ){
- i64 value;
- pMem->flags |= MEM_Str;
- if( sqlite3VdbeChangeEncoding(pMem, SQLITE_UTF8)
- || sqlite3VdbeMemNulTerminate(pMem) ){
- return 0;
- }
- assert( pMem->z );
- sqlite3Atoi64(pMem->z, &value);
- return value;
- }else{
- return 0;
- }
-}
-
-/*
-** Return the best representation of pMem that we can get into a
-** double. If pMem is already a double or an integer, return its
-** value. If it is a string or blob, try to convert it to a double.
-** If it is a NULL, return 0.0.
-*/
-double sqlite3VdbeRealValue(Mem *pMem){
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- if( pMem->flags & MEM_Real ){
- return pMem->r;
- }else if( pMem->flags & MEM_Int ){
- return (double)pMem->u.i;
- }else if( pMem->flags & (MEM_Str|MEM_Blob) ){
- double val = 0.0;
- pMem->flags |= MEM_Str;
- if( sqlite3VdbeChangeEncoding(pMem, SQLITE_UTF8)
- || sqlite3VdbeMemNulTerminate(pMem) ){
- return 0.0;
- }
- assert( pMem->z );
- sqlite3AtoF(pMem->z, &val);
- return val;
- }else{
- return 0.0;
- }
-}
-
-/*
-** The MEM structure is already a MEM_Real. Try to also make it a
-** MEM_Int if we can.
-*/
-void sqlite3VdbeIntegerAffinity(Mem *pMem){
- assert( pMem->flags & MEM_Real );
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- pMem->u.i = pMem->r;
- if( ((double)pMem->u.i)==pMem->r ){
- pMem->flags |= MEM_Int;
- }
-}
-
-/*
-** Convert pMem to type integer. Invalidate any prior representations.
-*/
-int sqlite3VdbeMemIntegerify(Mem *pMem){
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- pMem->u.i = sqlite3VdbeIntValue(pMem);
- sqlite3VdbeMemRelease(pMem);
- pMem->flags = MEM_Int;
- return SQLITE_OK;
-}
-
-/*
-** Convert pMem so that it is of type MEM_Real.
-** Invalidate any prior representations.
-*/
-int sqlite3VdbeMemRealify(Mem *pMem){
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- pMem->r = sqlite3VdbeRealValue(pMem);
- sqlite3VdbeMemRelease(pMem);
- pMem->flags = MEM_Real;
- return SQLITE_OK;
-}
-
-/*
-** Convert pMem so that it has types MEM_Real or MEM_Int or both.
-** Invalidate any prior representations.
-*/
-int sqlite3VdbeMemNumerify(Mem *pMem){
- double r1, r2;
- i64 i;
- assert( (pMem->flags & (MEM_Int|MEM_Real|MEM_Null))==0 );
- assert( (pMem->flags & (MEM_Blob|MEM_Str))!=0 );
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- r1 = sqlite3VdbeRealValue(pMem);
- i = (i64)r1;
- r2 = (double)i;
- if( r1==r2 ){
- sqlite3VdbeMemIntegerify(pMem);
- }else{
- pMem->r = r1;
- pMem->flags = MEM_Real;
- sqlite3VdbeMemRelease(pMem);
- }
- return SQLITE_OK;
-}
-
-/*
-** Delete any previous value and set the value stored in *pMem to NULL.
-*/
-void sqlite3VdbeMemSetNull(Mem *pMem){
- sqlite3VdbeMemRelease(pMem);
- pMem->flags = MEM_Null;
- pMem->type = SQLITE_NULL;
- pMem->n = 0;
-}
-
-/*
-** Delete any previous value and set the value to be a BLOB of length
-** n containing all zeros.
-*/
-void sqlite3VdbeMemSetZeroBlob(Mem *pMem, int n){
- sqlite3VdbeMemRelease(pMem);
- pMem->flags = MEM_Blob|MEM_Zero|MEM_Short;
- pMem->type = SQLITE_BLOB;
- pMem->n = 0;
- if( n<0 ) n = 0;
- pMem->u.i = n;
- pMem->z = pMem->zShort;
- pMem->enc = SQLITE_UTF8;
-}
-
-/*
-** Delete any previous value and set the value stored in *pMem to val,
-** manifest type INTEGER.
-*/
-void sqlite3VdbeMemSetInt64(Mem *pMem, i64 val){
- sqlite3VdbeMemRelease(pMem);
- pMem->u.i = val;
- pMem->flags = MEM_Int;
- pMem->type = SQLITE_INTEGER;
-}
-
-/*
-** Delete any previous value and set the value stored in *pMem to val,
-** manifest type REAL.
-*/
-void sqlite3VdbeMemSetDouble(Mem *pMem, double val){
- if( sqlite3_isnan(val) ){
- sqlite3VdbeMemSetNull(pMem);
- }else{
- sqlite3VdbeMemRelease(pMem);
- pMem->r = val;
- pMem->flags = MEM_Real;
- pMem->type = SQLITE_FLOAT;
- }
-}
-
-/*
-** Return true if the Mem object contains a TEXT or BLOB that is
-** too large - whose size exceeds SQLITE_MAX_LENGTH.
-*/
-int sqlite3VdbeMemTooBig(Mem *p){
- if( p->flags & (MEM_Str|MEM_Blob) ){
- int n = p->n;
- if( p->flags & MEM_Zero ){
- n += p->u.i;
- }
- return n>SQLITE_MAX_LENGTH;
- }
- return 0;
-}
-
-/*
-** Make an shallow copy of pFrom into pTo. Prior contents of
-** pTo are overwritten. The pFrom->z field is not duplicated. If
-** pFrom->z is used, then pTo->z points to the same thing as pFrom->z
-** and flags gets srcType (either MEM_Ephem or MEM_Static).
-*/
-void sqlite3VdbeMemShallowCopy(Mem *pTo, const Mem *pFrom, int srcType){
- memcpy(pTo, pFrom, sizeof(*pFrom)-sizeof(pFrom->zShort));
- pTo->xDel = 0;
- if( pTo->flags & (MEM_Str|MEM_Blob) ){
- pTo->flags &= ~(MEM_Dyn|MEM_Static|MEM_Short|MEM_Ephem);
- assert( srcType==MEM_Ephem || srcType==MEM_Static );
- pTo->flags |= srcType;
- }
-}
-
-/*
-** Make a full copy of pFrom into pTo. Prior contents of pTo are
-** freed before the copy is made.
-*/
-int sqlite3VdbeMemCopy(Mem *pTo, const Mem *pFrom){
- int rc;
- if( pTo->flags & MEM_Dyn ){
- sqlite3VdbeMemRelease(pTo);
- }
- sqlite3VdbeMemShallowCopy(pTo, pFrom, MEM_Ephem);
- if( pTo->flags & MEM_Ephem ){
- rc = sqlite3VdbeMemMakeWriteable(pTo);
- }else{
- rc = SQLITE_OK;
- }
- return rc;
-}
-
-/*
-** Transfer the contents of pFrom to pTo. Any existing value in pTo is
-** freed. If pFrom contains ephemeral data, a copy is made.
-**
-** pFrom contains an SQL NULL when this routine returns. SQLITE_NOMEM
-** might be returned if pFrom held ephemeral data and we were unable
-** to allocate enough space to make a copy.
-*/
-int sqlite3VdbeMemMove(Mem *pTo, Mem *pFrom){
- int rc;
- assert( pFrom->db==0 || sqlite3_mutex_held(pFrom->db->mutex) );
- assert( pTo->db==0 || sqlite3_mutex_held(pTo->db->mutex) );
- assert( pFrom->db==0 || pTo->db==0 || pFrom->db==pTo->db );
- if( pTo->flags & MEM_Dyn ){
- sqlite3VdbeMemRelease(pTo);
- }
- memcpy(pTo, pFrom, sizeof(Mem));
- if( pFrom->flags & MEM_Short ){
- pTo->z = pTo->zShort;
- }
- pFrom->flags = MEM_Null;
- pFrom->xDel = 0;
- if( pTo->flags & MEM_Ephem ){
- rc = sqlite3VdbeMemMakeWriteable(pTo);
- }else{
- rc = SQLITE_OK;
- }
- return rc;
-}
-
-/*
-** Change the value of a Mem to be a string or a BLOB.
-*/
-int sqlite3VdbeMemSetStr(
- Mem *pMem, /* Memory cell to set to string value */
- const char *z, /* String pointer */
- int n, /* Bytes in string, or negative */
- u8 enc, /* Encoding of z. 0 for BLOBs */
- void (*xDel)(void*) /* Destructor function */
-){
- assert( pMem->db==0 || sqlite3_mutex_held(pMem->db->mutex) );
- sqlite3VdbeMemRelease(pMem);
- if( !z ){
- pMem->flags = MEM_Null;
- pMem->type = SQLITE_NULL;
- return SQLITE_OK;
- }
- pMem->z = (char *)z;
- if( xDel==SQLITE_STATIC ){
- pMem->flags = MEM_Static;
- }else if( xDel==SQLITE_TRANSIENT ){
- pMem->flags = MEM_Ephem;
- }else{
- pMem->flags = MEM_Dyn;
- pMem->xDel = xDel;
- }
-
- pMem->enc = enc;
- pMem->type = enc==0 ? SQLITE_BLOB : SQLITE_TEXT;
- pMem->n = n;
-
- assert( enc==0 || enc==SQLITE_UTF8 || enc==SQLITE_UTF16LE
- || enc==SQLITE_UTF16BE );
- switch( enc ){
- case 0:
- pMem->flags |= MEM_Blob;
- pMem->enc = SQLITE_UTF8;
- break;
-
- case SQLITE_UTF8:
- pMem->flags |= MEM_Str;
- if( n<0 ){
- pMem->n = strlen(z);
- pMem->flags |= MEM_Term;
- }
- break;
-
-#ifndef SQLITE_OMIT_UTF16
- case SQLITE_UTF16LE:
- case SQLITE_UTF16BE:
- pMem->flags |= MEM_Str;
- if( pMem->n<0 ){
- pMem->n = sqlite3Utf16ByteLen(pMem->z,-1);
- pMem->flags |= MEM_Term;
- }
- if( sqlite3VdbeMemHandleBom(pMem) ){
- return SQLITE_NOMEM;
- }
-#endif /* SQLITE_OMIT_UTF16 */
- }
- if( pMem->flags&MEM_Ephem ){
- return sqlite3VdbeMemMakeWriteable(pMem);
- }
- return SQLITE_OK;
-}
-
-/*
-** Compare the values contained by the two memory cells, returning
-** negative, zero or positive if pMem1 is less than, equal to, or greater
-** than pMem2. Sorting order is NULL's first, followed by numbers (integers
-** and reals) sorted numerically, followed by text ordered by the collating
-** sequence pColl and finally blob's ordered by memcmp().
-**
-** Two NULL values are considered equal by this function.
-*/
-int sqlite3MemCompare(const Mem *pMem1, const Mem *pMem2, const CollSeq *pColl){
- int rc;
- int f1, f2;
- int combined_flags;
-
- /* Interchange pMem1 and pMem2 if the collating sequence specifies
- ** DESC order.
- */
- f1 = pMem1->flags;
- f2 = pMem2->flags;
- combined_flags = f1|f2;
-
- /* If one value is NULL, it is less than the other. If both values
- ** are NULL, return 0.
- */
- if( combined_flags&MEM_Null ){
- return (f2&MEM_Null) - (f1&MEM_Null);
- }
-
- /* If one value is a number and the other is not, the number is less.
- ** If both are numbers, compare as reals if one is a real, or as integers
- ** if both values are integers.
- */
- if( combined_flags&(MEM_Int|MEM_Real) ){
- if( !(f1&(MEM_Int|MEM_Real)) ){
- return 1;
- }
- if( !(f2&(MEM_Int|MEM_Real)) ){
- return -1;
- }
- if( (f1 & f2 & MEM_Int)==0 ){
- double r1, r2;
- if( (f1&MEM_Real)==0 ){
- r1 = pMem1->u.i;
- }else{
- r1 = pMem1->r;
- }
- if( (f2&MEM_Real)==0 ){
- r2 = pMem2->u.i;
- }else{
- r2 = pMem2->r;
- }
- if( r1<r2 ) return -1;
- if( r1>r2 ) return 1;
- return 0;
- }else{
- assert( f1&MEM_Int );
- assert( f2&MEM_Int );
- if( pMem1->u.i < pMem2->u.i ) return -1;
- if( pMem1->u.i > pMem2->u.i ) return 1;
- return 0;
- }
- }
-
- /* If one value is a string and the other is a blob, the string is less.
- ** If both are strings, compare using the collating functions.
- */
- if( combined_flags&MEM_Str ){
- if( (f1 & MEM_Str)==0 ){
- return 1;
- }
- if( (f2 & MEM_Str)==0 ){
- return -1;
- }
-
- assert( pMem1->enc==pMem2->enc );
- assert( pMem1->enc==SQLITE_UTF8 ||
- pMem1->enc==SQLITE_UTF16LE || pMem1->enc==SQLITE_UTF16BE );
-
- /* The collation sequence must be defined at this point, even if
- ** the user deletes the collation sequence after the vdbe program is
- ** compiled (this was not always the case).
- */
- assert( !pColl || pColl->xCmp );
-
- if( pColl ){
- if( pMem1->enc==pColl->enc ){
- /* The strings are already in the correct encoding. Call the
- ** comparison function directly */
- return pColl->xCmp(pColl->pUser,pMem1->n,pMem1->z,pMem2->n,pMem2->z);
- }else{
- u8 origEnc = pMem1->enc;
- const void *v1, *v2;
- int n1, n2;
- /* Convert the strings into the encoding that the comparison
- ** function expects */
- v1 = sqlite3ValueText((sqlite3_value*)pMem1, pColl->enc);
- n1 = v1==0 ? 0 : pMem1->n;
- assert( n1==sqlite3ValueBytes((sqlite3_value*)pMem1, pColl->enc) );
- v2 = sqlite3ValueText((sqlite3_value*)pMem2, pColl->enc);
- n2 = v2==0 ? 0 : pMem2->n;
- assert( n2==sqlite3ValueBytes((sqlite3_value*)pMem2, pColl->enc) );
- /* Do the comparison */
- rc = pColl->xCmp(pColl->pUser, n1, v1, n2, v2);
- /* Convert the strings back into the database encoding */
- sqlite3ValueText((sqlite3_value*)pMem1, origEnc);
- sqlite3ValueText((sqlite3_value*)pMem2, origEnc);
- return rc;
- }
- }
- /* If a NULL pointer was passed as the collate function, fall through
- ** to the blob case and use memcmp(). */
- }
-
- /* Both values must be blobs. Compare using memcmp(). */
- rc = memcmp(pMem1->z, pMem2->z, (pMem1->n>pMem2->n)?pMem2->n:pMem1->n);
- if( rc==0 ){
- rc = pMem1->n - pMem2->n;
- }
- return rc;
-}
-
-/*
-** Move data out of a btree key or data field and into a Mem structure.
-** The data or key is taken from the entry that pCur is currently pointing
-** to. offset and amt determine what portion of the data or key to retrieve.
-** key is true to get the key or false to get data. The result is written
-** into the pMem element.
-**
-** The pMem structure is assumed to be uninitialized. Any prior content
-** is overwritten without being freed.
-**
-** If this routine fails for any reason (malloc returns NULL or unable
-** to read from the disk) then the pMem is left in an inconsistent state.
-*/
-int sqlite3VdbeMemFromBtree(
- BtCursor *pCur, /* Cursor pointing at record to retrieve. */
- int offset, /* Offset from the start of data to return bytes from. */
- int amt, /* Number of bytes to return. */
- int key, /* If true, retrieve from the btree key, not data. */
- Mem *pMem /* OUT: Return data in this Mem structure. */
-){
- char *zData; /* Data from the btree layer */
- int available = 0; /* Number of bytes available on the local btree page */
- sqlite3 *db; /* Database connection */
-
- db = sqlite3BtreeCursorDb(pCur);
- assert( sqlite3_mutex_held(db->mutex) );
- if( key ){
- zData = (char *)sqlite3BtreeKeyFetch(pCur, &available);
- }else{
- zData = (char *)sqlite3BtreeDataFetch(pCur, &available);
- }
- assert( zData!=0 );
-
- pMem->db = db;
- pMem->n = amt;
- if( offset+amt<=available ){
- pMem->z = &zData[offset];
- pMem->flags = MEM_Blob|MEM_Ephem;
- }else{
- int rc;
- if( amt>NBFS-2 ){
- zData = (char *)sqlite3DbMallocRaw(db, amt+2);
- if( !zData ){
- return SQLITE_NOMEM;
- }
- pMem->flags = MEM_Blob|MEM_Dyn|MEM_Term;
- pMem->xDel = 0;
- }else{
- zData = &(pMem->zShort[0]);
- pMem->flags = MEM_Blob|MEM_Short|MEM_Term;
- }
- pMem->z = zData;
- pMem->enc = 0;
- pMem->type = SQLITE_BLOB;
-
- if( key ){
- rc = sqlite3BtreeKey(pCur, offset, amt, zData);
- }else{
- rc = sqlite3BtreeData(pCur, offset, amt, zData);
- }
- zData[amt] = 0;
- zData[amt+1] = 0;
- if( rc!=SQLITE_OK ){
- if( amt>NBFS-2 ){
- assert( zData!=pMem->zShort );
- assert( pMem->flags & MEM_Dyn );
- sqlite3_free(zData);
- } else {
- assert( zData==pMem->zShort );
- assert( pMem->flags & MEM_Short );
- }
- return rc;
- }
- }
-
- return SQLITE_OK;
-}
-
-#ifndef NDEBUG
-/*
-** Perform various checks on the memory cell pMem. An assert() will
-** fail if pMem is internally inconsistent.
-*/
-void sqlite3VdbeMemSanity(Mem *pMem){
- int flags = pMem->flags;
- assert( flags!=0 ); /* Must define some type */
- if( flags & (MEM_Str|MEM_Blob) ){
- int x = flags & (MEM_Static|MEM_Dyn|MEM_Ephem|MEM_Short);
- assert( x!=0 ); /* Strings must define a string subtype */
- assert( (x & (x-1))==0 ); /* Only one string subtype can be defined */
- assert( pMem->z!=0 ); /* Strings must have a value */
- /* Mem.z points to Mem.zShort iff the subtype is MEM_Short */
- assert( (x & MEM_Short)==0 || pMem->z==pMem->zShort );
- assert( (x & MEM_Short)!=0 || pMem->z!=pMem->zShort );
- /* No destructor unless there is MEM_Dyn */
- assert( pMem->xDel==0 || (pMem->flags & MEM_Dyn)!=0 );
-
- if( (flags & MEM_Str) ){
- assert( pMem->enc==SQLITE_UTF8 ||
- pMem->enc==SQLITE_UTF16BE ||
- pMem->enc==SQLITE_UTF16LE
- );
- /* If the string is UTF-8 encoded and nul terminated, then pMem->n
- ** must be the length of the string. (Later:) If the database file
- ** has been corrupted, '\000' characters might have been inserted
- ** into the middle of the string. In that case, the strlen() might
- ** be less.
- */
- if( pMem->enc==SQLITE_UTF8 && (flags & MEM_Term) ){
- assert( strlen(pMem->z)<=pMem->n );
- assert( pMem->z[pMem->n]==0 );
- }
- }
- }else{
- /* Cannot define a string subtype for non-string objects */
- assert( (pMem->flags & (MEM_Static|MEM_Dyn|MEM_Ephem|MEM_Short))==0 );
- assert( pMem->xDel==0 );
- }
- /* MEM_Null excludes all other types */
- assert( (pMem->flags&(MEM_Str|MEM_Int|MEM_Real|MEM_Blob))==0
- || (pMem->flags&MEM_Null)==0 );
- /* If the MEM is both real and integer, the values are equal */
- assert( (pMem->flags & (MEM_Int|MEM_Real))!=(MEM_Int|MEM_Real)
- || pMem->r==pMem->u.i );
-}
-#endif
-
-/* This function is only available internally, it is not part of the
-** external API. It works in a similar way to sqlite3_value_text(),
-** except the data returned is in the encoding specified by the second
-** parameter, which must be one of SQLITE_UTF16BE, SQLITE_UTF16LE or
-** SQLITE_UTF8.
-**
-** (2006-02-16:) The enc value can be or-ed with SQLITE_UTF16_ALIGNED.
-** If that is the case, then the result must be aligned on an even byte
-** boundary.
-*/
-const void *sqlite3ValueText(sqlite3_value* pVal, u8 enc){
- if( !pVal ) return 0;
-
- assert( pVal->db==0 || sqlite3_mutex_held(pVal->db->mutex) );
- assert( (enc&3)==(enc&~SQLITE_UTF16_ALIGNED) );
-
- if( pVal->flags&MEM_Null ){
- return 0;
- }
- assert( (MEM_Blob>>3) == MEM_Str );
- pVal->flags |= (pVal->flags & MEM_Blob)>>3;
- expandBlob(pVal);
- if( pVal->flags&MEM_Str ){
- sqlite3VdbeChangeEncoding(pVal, enc & ~SQLITE_UTF16_ALIGNED);
- if( (enc & SQLITE_UTF16_ALIGNED)!=0 && 1==(1&(int)pVal->z) ){
- assert( (pVal->flags & (MEM_Ephem|MEM_Static))!=0 );
- if( sqlite3VdbeMemMakeWriteable(pVal)!=SQLITE_OK ){
- return 0;
- }
- }
- sqlite3VdbeMemNulTerminate(pVal);
- }else{
- assert( (pVal->flags&MEM_Blob)==0 );
- sqlite3VdbeMemStringify(pVal, enc);
- assert( 0==(1&(int)pVal->z) );
- }
- assert(pVal->enc==(enc & ~SQLITE_UTF16_ALIGNED) || pVal->db==0
- || pVal->db->mallocFailed );
- if( pVal->enc==(enc & ~SQLITE_UTF16_ALIGNED) ){
- return pVal->z;
- }else{
- return 0;
- }
-}
-
-/*
-** Create a new sqlite3_value object.
-*/
-sqlite3_value *sqlite3ValueNew(sqlite3 *db){
- Mem *p = (Mem*)sqlite3DbMallocZero(db, sizeof(*p));
- if( p ){
- p->flags = MEM_Null;
- p->type = SQLITE_NULL;
- p->db = db;
- }
- return p;
-}
-
-/*
-** Create a new sqlite3_value object, containing the value of pExpr.
-**
-** This only works for very simple expressions that consist of one constant
-** token (i.e. "5", "5.1", "NULL", "'a string'"). If the expression can
-** be converted directly into a value, then the value is allocated and
-** a pointer written to *ppVal. The caller is responsible for deallocating
-** the value by passing it to sqlite3ValueFree() later on. If the expression
-** cannot be converted to a value, then *ppVal is set to NULL.
-*/
-int sqlite3ValueFromExpr(
- sqlite3 *db, /* The database connection */
- Expr *pExpr, /* The expression to evaluate */
- u8 enc, /* Encoding to use */
- u8 affinity, /* Affinity to use */
- sqlite3_value **ppVal /* Write the new value here */
-){
- int op;
- char *zVal = 0;
- sqlite3_value *pVal = 0;
-
- if( !pExpr ){
- *ppVal = 0;
- return SQLITE_OK;
- }
- op = pExpr->op;
-
- if( op==TK_STRING || op==TK_FLOAT || op==TK_INTEGER ){
- zVal = sqlite3StrNDup((char*)pExpr->token.z, pExpr->token.n);
- pVal = sqlite3ValueNew(db);
- if( !zVal || !pVal ) goto no_mem;
- sqlite3Dequote(zVal);
- sqlite3ValueSetStr(pVal, -1, zVal, SQLITE_UTF8, sqlite3_free);
- if( (op==TK_INTEGER || op==TK_FLOAT ) && affinity==SQLITE_AFF_NONE ){
- sqlite3ValueApplyAffinity(pVal, SQLITE_AFF_NUMERIC, enc);
- }else{
- sqlite3ValueApplyAffinity(pVal, affinity, enc);
- }
- }else if( op==TK_UMINUS ) {
- if( SQLITE_OK==sqlite3ValueFromExpr(db,pExpr->pLeft,enc,affinity,&pVal) ){
- pVal->u.i = -1 * pVal->u.i;
- pVal->r = -1.0 * pVal->r;
- }
- }
-#ifndef SQLITE_OMIT_BLOB_LITERAL
- else if( op==TK_BLOB ){
- int nVal;
- pVal = sqlite3ValueNew(db);
- zVal = sqlite3StrNDup((char*)pExpr->token.z+1, pExpr->token.n-1);
- if( !zVal || !pVal ) goto no_mem;
- sqlite3Dequote(zVal);
- nVal = strlen(zVal)/2;
- sqlite3VdbeMemSetStr(pVal, (const char*)sqlite3HexToBlob(db, zVal), nVal,0,sqlite3_free);
- sqlite3_free(zVal);
- }
-#endif
-
- *ppVal = pVal;
- return SQLITE_OK;
-
-no_mem:
- db->mallocFailed = 1;
- sqlite3_free(zVal);
- sqlite3ValueFree(pVal);
- *ppVal = 0;
- return SQLITE_NOMEM;
-}
-
-/*
-** Change the string value of an sqlite3_value object
-*/
-void sqlite3ValueSetStr(
- sqlite3_value *v, /* Value to be set */
- int n, /* Length of string z */
- const void *z, /* Text of the new string */
- u8 enc, /* Encoding to use */
- void (*xDel)(void*) /* Destructor for the string */
-){
- if( v ) sqlite3VdbeMemSetStr((Mem *)v, (const char*)z, n, enc, xDel);
-}
-
-/*
-** Free an sqlite3_value object
-*/
-void sqlite3ValueFree(sqlite3_value *v){
- if( !v ) return;
- sqlite3ValueSetStr(v, 0, 0, SQLITE_UTF8, SQLITE_STATIC);
- sqlite3_free(v);
-}
-
-/*
-** Return the number of bytes in the sqlite3_value object assuming
-** that it uses the encoding "enc"
-*/
-int sqlite3ValueBytes(sqlite3_value *pVal, u8 enc){
- Mem *p = (Mem*)pVal;
- if( (p->flags & MEM_Blob)!=0 || sqlite3ValueText(pVal, enc) ){
- if( p->flags & MEM_Zero ){
- return p->n+p->u.i;
- }else{
- return p->n;
- }
- }
- return 0;
-}