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Overview
| Comment: | Minor optimization on clearCell() |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
f3c39c2986be08683c2af4df610bc12e |
| User & Date: | drh 2017-08-02 18:27:50 |
Context
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2017-08-02
| ||
| 18:28 | Only attempt to invoke WAL callbacks when a transaction has committed. check-in: bcc6dacb user: drh tags: trunk | |
| 18:27 | Minor optimization on clearCell() check-in: f3c39c29 user: drh tags: trunk | |
| 15:50 | Optimizations associated with error handling in btree cursors. check-in: 49ba54e2 user: drh tags: trunk | |
Changes
Changes to src/btree.c.
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** overflow) into *pnSize.
*/
static int clearCell(
MemPage *pPage, /* The page that contains the Cell */
unsigned char *pCell, /* First byte of the Cell */
CellInfo *pInfo /* Size information about the cell */
){
BtShared *pBt = pPage->pBt;
Pgno ovflPgno;
int rc;
int nOvfl;
u32 ovflPageSize;
assert( sqlite3_mutex_held(pPage->pBt->mutex) );
pPage->xParseCell(pPage, pCell, pInfo);
................................................................................
return SQLITE_OK; /* No overflow pages. Return without doing anything */
}
if( pCell+pInfo->nSize-1 > pPage->aData+pPage->maskPage ){
/* Cell extends past end of page */
return SQLITE_CORRUPT_PGNO(pPage->pgno);
}
ovflPgno = get4byte(pCell + pInfo->nSize - 4);
assert( pBt->usableSize > 4 );
ovflPageSize = pBt->usableSize - 4;
nOvfl = (pInfo->nPayload - pInfo->nLocal + ovflPageSize - 1)/ovflPageSize;
assert( nOvfl>0 ||
(CORRUPT_DB && (pInfo->nPayload + ovflPageSize)<ovflPageSize)
);
while( nOvfl-- ){
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>
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** overflow) into *pnSize.
*/
static int clearCell(
MemPage *pPage, /* The page that contains the Cell */
unsigned char *pCell, /* First byte of the Cell */
CellInfo *pInfo /* Size information about the cell */
){
BtShared *pBt;
Pgno ovflPgno;
int rc;
int nOvfl;
u32 ovflPageSize;
assert( sqlite3_mutex_held(pPage->pBt->mutex) );
pPage->xParseCell(pPage, pCell, pInfo);
................................................................................
return SQLITE_OK; /* No overflow pages. Return without doing anything */
}
if( pCell+pInfo->nSize-1 > pPage->aData+pPage->maskPage ){
/* Cell extends past end of page */
return SQLITE_CORRUPT_PGNO(pPage->pgno);
}
ovflPgno = get4byte(pCell + pInfo->nSize - 4);
pBt = pPage->pBt;
assert( pBt->usableSize > 4 );
ovflPageSize = pBt->usableSize - 4;
nOvfl = (pInfo->nPayload - pInfo->nLocal + ovflPageSize - 1)/ovflPageSize;
assert( nOvfl>0 ||
(CORRUPT_DB && (pInfo->nPayload + ovflPageSize)<ovflPageSize)
);
while( nOvfl-- ){
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