Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
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: | f3c39c2986be08683c2af4df610bc12e3c6bc6bec265c94ce01b94a950723524 |
| User & Date: | drh 2017-08-02 18:27:50 |
Context
|
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.
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
....
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
|
** 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-- ){
|
|
>
|
6113
6114
6115
6116
6117
6118
6119
6120
6121
6122
6123
6124
6125
6126
6127
....
6129
6130
6131
6132
6133
6134
6135
6136
6137
6138
6139
6140
6141
6142
6143
|
** 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-- ){
|