393 lines
10 KiB
C
393 lines
10 KiB
C
/*
|
|
** 2014 May 31
|
|
**
|
|
** 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 "fts5Int.h"
|
|
|
|
int sqlite3Fts5BufferSize(int *pRc, Fts5Buffer *pBuf, u32 nByte){
|
|
if( (u32)pBuf->nSpace<nByte ){
|
|
u32 nNew = pBuf->nSpace ? pBuf->nSpace : 64;
|
|
u8 *pNew;
|
|
while( nNew<nByte ){
|
|
nNew = nNew * 2;
|
|
}
|
|
pNew = sqlite3_realloc(pBuf->p, nNew);
|
|
if( pNew==0 ){
|
|
*pRc = SQLITE_NOMEM;
|
|
return 1;
|
|
}else{
|
|
pBuf->nSpace = nNew;
|
|
pBuf->p = pNew;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
** Encode value iVal as an SQLite varint and append it to the buffer object
|
|
** pBuf. If an OOM error occurs, set the error code in p.
|
|
*/
|
|
void sqlite3Fts5BufferAppendVarint(int *pRc, Fts5Buffer *pBuf, i64 iVal){
|
|
if( fts5BufferGrow(pRc, pBuf, 9) ) return;
|
|
pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], iVal);
|
|
}
|
|
|
|
void sqlite3Fts5Put32(u8 *aBuf, int iVal){
|
|
aBuf[0] = (iVal>>24) & 0x00FF;
|
|
aBuf[1] = (iVal>>16) & 0x00FF;
|
|
aBuf[2] = (iVal>> 8) & 0x00FF;
|
|
aBuf[3] = (iVal>> 0) & 0x00FF;
|
|
}
|
|
|
|
int sqlite3Fts5Get32(const u8 *aBuf){
|
|
return (aBuf[0] << 24) + (aBuf[1] << 16) + (aBuf[2] << 8) + aBuf[3];
|
|
}
|
|
|
|
/*
|
|
** Append buffer nData/pData to buffer pBuf. If an OOM error occurs, set
|
|
** the error code in p. If an error has already occurred when this function
|
|
** is called, it is a no-op.
|
|
*/
|
|
void sqlite3Fts5BufferAppendBlob(
|
|
int *pRc,
|
|
Fts5Buffer *pBuf,
|
|
u32 nData,
|
|
const u8 *pData
|
|
){
|
|
assert_nc( *pRc || nData>=0 );
|
|
if( fts5BufferGrow(pRc, pBuf, nData) ) return;
|
|
memcpy(&pBuf->p[pBuf->n], pData, nData);
|
|
pBuf->n += nData;
|
|
}
|
|
|
|
/*
|
|
** Append the nul-terminated string zStr to the buffer pBuf. This function
|
|
** ensures that the byte following the buffer data is set to 0x00, even
|
|
** though this byte is not included in the pBuf->n count.
|
|
*/
|
|
void sqlite3Fts5BufferAppendString(
|
|
int *pRc,
|
|
Fts5Buffer *pBuf,
|
|
const char *zStr
|
|
){
|
|
int nStr = (int)strlen(zStr);
|
|
sqlite3Fts5BufferAppendBlob(pRc, pBuf, nStr+1, (const u8*)zStr);
|
|
pBuf->n--;
|
|
}
|
|
|
|
/*
|
|
** Argument zFmt is a printf() style format string. This function performs
|
|
** the printf() style processing, then appends the results to buffer pBuf.
|
|
**
|
|
** Like sqlite3Fts5BufferAppendString(), this function ensures that the byte
|
|
** following the buffer data is set to 0x00, even though this byte is not
|
|
** included in the pBuf->n count.
|
|
*/
|
|
void sqlite3Fts5BufferAppendPrintf(
|
|
int *pRc,
|
|
Fts5Buffer *pBuf,
|
|
char *zFmt, ...
|
|
){
|
|
if( *pRc==SQLITE_OK ){
|
|
char *zTmp;
|
|
va_list ap;
|
|
va_start(ap, zFmt);
|
|
zTmp = sqlite3_vmprintf(zFmt, ap);
|
|
va_end(ap);
|
|
|
|
if( zTmp==0 ){
|
|
*pRc = SQLITE_NOMEM;
|
|
}else{
|
|
sqlite3Fts5BufferAppendString(pRc, pBuf, zTmp);
|
|
sqlite3_free(zTmp);
|
|
}
|
|
}
|
|
}
|
|
|
|
char *sqlite3Fts5Mprintf(int *pRc, const char *zFmt, ...){
|
|
char *zRet = 0;
|
|
if( *pRc==SQLITE_OK ){
|
|
va_list ap;
|
|
va_start(ap, zFmt);
|
|
zRet = sqlite3_vmprintf(zFmt, ap);
|
|
va_end(ap);
|
|
if( zRet==0 ){
|
|
*pRc = SQLITE_NOMEM;
|
|
}
|
|
}
|
|
return zRet;
|
|
}
|
|
|
|
|
|
/*
|
|
** Free any buffer allocated by pBuf. Zero the structure before returning.
|
|
*/
|
|
void sqlite3Fts5BufferFree(Fts5Buffer *pBuf){
|
|
sqlite3_free(pBuf->p);
|
|
memset(pBuf, 0, sizeof(Fts5Buffer));
|
|
}
|
|
|
|
/*
|
|
** Zero the contents of the buffer object. But do not free the associated
|
|
** memory allocation.
|
|
*/
|
|
void sqlite3Fts5BufferZero(Fts5Buffer *pBuf){
|
|
pBuf->n = 0;
|
|
}
|
|
|
|
/*
|
|
** Set the buffer to contain nData/pData. If an OOM error occurs, leave an
|
|
** the error code in p. If an error has already occurred when this function
|
|
** is called, it is a no-op.
|
|
*/
|
|
void sqlite3Fts5BufferSet(
|
|
int *pRc,
|
|
Fts5Buffer *pBuf,
|
|
int nData,
|
|
const u8 *pData
|
|
){
|
|
pBuf->n = 0;
|
|
sqlite3Fts5BufferAppendBlob(pRc, pBuf, nData, pData);
|
|
}
|
|
|
|
int sqlite3Fts5PoslistNext64(
|
|
const u8 *a, int n, /* Buffer containing poslist */
|
|
int *pi, /* IN/OUT: Offset within a[] */
|
|
i64 *piOff /* IN/OUT: Current offset */
|
|
){
|
|
int i = *pi;
|
|
if( i>=n ){
|
|
/* EOF */
|
|
*piOff = -1;
|
|
return 1;
|
|
}else{
|
|
i64 iOff = *piOff;
|
|
int iVal;
|
|
fts5FastGetVarint32(a, i, iVal);
|
|
if( iVal==1 ){
|
|
fts5FastGetVarint32(a, i, iVal);
|
|
iOff = ((i64)iVal) << 32;
|
|
fts5FastGetVarint32(a, i, iVal);
|
|
}
|
|
*piOff = iOff + (iVal-2);
|
|
*pi = i;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
** Advance the iterator object passed as the only argument. Return true
|
|
** if the iterator reaches EOF, or false otherwise.
|
|
*/
|
|
int sqlite3Fts5PoslistReaderNext(Fts5PoslistReader *pIter){
|
|
if( sqlite3Fts5PoslistNext64(pIter->a, pIter->n, &pIter->i, &pIter->iPos) ){
|
|
pIter->bEof = 1;
|
|
}
|
|
return pIter->bEof;
|
|
}
|
|
|
|
int sqlite3Fts5PoslistReaderInit(
|
|
const u8 *a, int n, /* Poslist buffer to iterate through */
|
|
Fts5PoslistReader *pIter /* Iterator object to initialize */
|
|
){
|
|
memset(pIter, 0, sizeof(*pIter));
|
|
pIter->a = a;
|
|
pIter->n = n;
|
|
sqlite3Fts5PoslistReaderNext(pIter);
|
|
return pIter->bEof;
|
|
}
|
|
|
|
/*
|
|
** Append position iPos to the position list being accumulated in buffer
|
|
** pBuf, which must be already be large enough to hold the new data.
|
|
** The previous position written to this list is *piPrev. *piPrev is set
|
|
** to iPos before returning.
|
|
*/
|
|
void sqlite3Fts5PoslistSafeAppend(
|
|
Fts5Buffer *pBuf,
|
|
i64 *piPrev,
|
|
i64 iPos
|
|
){
|
|
static const i64 colmask = ((i64)(0x7FFFFFFF)) << 32;
|
|
if( (iPos & colmask) != (*piPrev & colmask) ){
|
|
pBuf->p[pBuf->n++] = 1;
|
|
pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], (iPos>>32));
|
|
*piPrev = (iPos & colmask);
|
|
}
|
|
pBuf->n += sqlite3Fts5PutVarint(&pBuf->p[pBuf->n], (iPos-*piPrev)+2);
|
|
*piPrev = iPos;
|
|
}
|
|
|
|
int sqlite3Fts5PoslistWriterAppend(
|
|
Fts5Buffer *pBuf,
|
|
Fts5PoslistWriter *pWriter,
|
|
i64 iPos
|
|
){
|
|
int rc = 0; /* Initialized only to suppress erroneous warning from Clang */
|
|
if( fts5BufferGrow(&rc, pBuf, 5+5+5) ) return rc;
|
|
sqlite3Fts5PoslistSafeAppend(pBuf, &pWriter->iPrev, iPos);
|
|
return SQLITE_OK;
|
|
}
|
|
|
|
void *sqlite3Fts5MallocZero(int *pRc, int nByte){
|
|
void *pRet = 0;
|
|
if( *pRc==SQLITE_OK ){
|
|
pRet = sqlite3_malloc(nByte);
|
|
if( pRet==0 && nByte>0 ){
|
|
*pRc = SQLITE_NOMEM;
|
|
}else{
|
|
memset(pRet, 0, nByte);
|
|
}
|
|
}
|
|
return pRet;
|
|
}
|
|
|
|
/*
|
|
** Return a nul-terminated copy of the string indicated by pIn. If nIn
|
|
** is non-negative, then it is the length of the string in bytes. Otherwise,
|
|
** the length of the string is determined using strlen().
|
|
**
|
|
** It is the responsibility of the caller to eventually free the returned
|
|
** buffer using sqlite3_free(). If an OOM error occurs, NULL is returned.
|
|
*/
|
|
char *sqlite3Fts5Strndup(int *pRc, const char *pIn, int nIn){
|
|
char *zRet = 0;
|
|
if( *pRc==SQLITE_OK ){
|
|
if( nIn<0 ){
|
|
nIn = (int)strlen(pIn);
|
|
}
|
|
zRet = (char*)sqlite3_malloc(nIn+1);
|
|
if( zRet ){
|
|
memcpy(zRet, pIn, nIn);
|
|
zRet[nIn] = '\0';
|
|
}else{
|
|
*pRc = SQLITE_NOMEM;
|
|
}
|
|
}
|
|
return zRet;
|
|
}
|
|
|
|
|
|
/*
|
|
** Return true if character 't' may be part of an FTS5 bareword, or false
|
|
** otherwise. Characters that may be part of barewords:
|
|
**
|
|
** * All non-ASCII characters,
|
|
** * The 52 upper and lower case ASCII characters, and
|
|
** * The 10 integer ASCII characters.
|
|
** * The underscore character "_" (0x5F).
|
|
** * The unicode "subsitute" character (0x1A).
|
|
*/
|
|
int sqlite3Fts5IsBareword(char t){
|
|
u8 aBareword[128] = {
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x00 .. 0x0F */
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, /* 0x10 .. 0x1F */
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0x20 .. 0x2F */
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, /* 0x30 .. 0x3F */
|
|
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x40 .. 0x4F */
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, /* 0x50 .. 0x5F */
|
|
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x60 .. 0x6F */
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 /* 0x70 .. 0x7F */
|
|
};
|
|
|
|
return (t & 0x80) || aBareword[(int)t];
|
|
}
|
|
|
|
|
|
/*************************************************************************
|
|
*/
|
|
typedef struct Fts5TermsetEntry Fts5TermsetEntry;
|
|
struct Fts5TermsetEntry {
|
|
char *pTerm;
|
|
int nTerm;
|
|
int iIdx; /* Index (main or aPrefix[] entry) */
|
|
Fts5TermsetEntry *pNext;
|
|
};
|
|
|
|
struct Fts5Termset {
|
|
Fts5TermsetEntry *apHash[512];
|
|
};
|
|
|
|
int sqlite3Fts5TermsetNew(Fts5Termset **pp){
|
|
int rc = SQLITE_OK;
|
|
*pp = sqlite3Fts5MallocZero(&rc, sizeof(Fts5Termset));
|
|
return rc;
|
|
}
|
|
|
|
int sqlite3Fts5TermsetAdd(
|
|
Fts5Termset *p,
|
|
int iIdx,
|
|
const char *pTerm, int nTerm,
|
|
int *pbPresent
|
|
){
|
|
int rc = SQLITE_OK;
|
|
*pbPresent = 0;
|
|
if( p ){
|
|
int i;
|
|
u32 hash = 13;
|
|
Fts5TermsetEntry *pEntry;
|
|
|
|
/* Calculate a hash value for this term. This is the same hash checksum
|
|
** used by the fts5_hash.c module. This is not important for correct
|
|
** operation of the module, but is necessary to ensure that some tests
|
|
** designed to produce hash table collisions really do work. */
|
|
for(i=nTerm-1; i>=0; i--){
|
|
hash = (hash << 3) ^ hash ^ pTerm[i];
|
|
}
|
|
hash = (hash << 3) ^ hash ^ iIdx;
|
|
hash = hash % ArraySize(p->apHash);
|
|
|
|
for(pEntry=p->apHash[hash]; pEntry; pEntry=pEntry->pNext){
|
|
if( pEntry->iIdx==iIdx
|
|
&& pEntry->nTerm==nTerm
|
|
&& memcmp(pEntry->pTerm, pTerm, nTerm)==0
|
|
){
|
|
*pbPresent = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if( pEntry==0 ){
|
|
pEntry = sqlite3Fts5MallocZero(&rc, sizeof(Fts5TermsetEntry) + nTerm);
|
|
if( pEntry ){
|
|
pEntry->pTerm = (char*)&pEntry[1];
|
|
pEntry->nTerm = nTerm;
|
|
pEntry->iIdx = iIdx;
|
|
memcpy(pEntry->pTerm, pTerm, nTerm);
|
|
pEntry->pNext = p->apHash[hash];
|
|
p->apHash[hash] = pEntry;
|
|
}
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
void sqlite3Fts5TermsetFree(Fts5Termset *p){
|
|
if( p ){
|
|
u32 i;
|
|
for(i=0; i<ArraySize(p->apHash); i++){
|
|
Fts5TermsetEntry *pEntry = p->apHash[i];
|
|
while( pEntry ){
|
|
Fts5TermsetEntry *pDel = pEntry;
|
|
pEntry = pEntry->pNext;
|
|
sqlite3_free(pDel);
|
|
}
|
|
}
|
|
sqlite3_free(p);
|
|
}
|
|
}
|