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Experimental API: sqlite3_database_file_object().

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FossilOrigin-Name: ae697b152d22737169892411a0c4d908895ff5fb249cce9bdb1ba0bbe32806f0
This commit is contained in:
drh
2020-04-21 01:06:35 +00:00
parent 3b9f154bb7
commit 480620c713
6 changed files with 50 additions and 10 deletions
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16
src/pager.c
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@@ -4742,6 +4742,7 @@ int sqlite3PagerOpen(
** Database file handle (pVfs->szOsFile bytes)
** Sub-journal file handle (journalFileSize bytes)
** Main journal file handle (journalFileSize bytes)
** Ptr back to the Pager (sizeof(Pager*) bytes)
** \0\0\0\0 database prefix (4 bytes)
** Database file name (nPathname+1 bytes)
** URI query parameters (nUriByte bytes)
@@ -4781,6 +4782,7 @@ int sqlite3PagerOpen(
ROUND8(pcacheSize) + /* PCache object */
ROUND8(pVfs->szOsFile) + /* The main db file */
journalFileSize * 2 + /* The two journal files */
sizeof(pPager) + /* Space to hold a pointer */
4 + /* Database prefix */
nPathname + 1 + /* database filename */
nUriByte + /* query parameters */
@@ -4801,6 +4803,7 @@ int sqlite3PagerOpen(
pPager->sjfd = (sqlite3_file*)pPtr; pPtr += journalFileSize;
pPager->jfd = (sqlite3_file*)pPtr; pPtr += journalFileSize;
assert( EIGHT_BYTE_ALIGNMENT(pPager->jfd) );
memcpy(pPtr, &pPager, sizeof(pPager)); pPtr += sizeof(pPager);
/* Fill in the Pager.zFilename and pPager.zQueryParam fields */
pPtr += 4; /* Skip zero prefix */
@@ -5001,6 +5004,19 @@ act_like_temp_file:
return SQLITE_OK;
}
/*
** Return the sqlite3_file for the main database given the name
** of the corresonding WAL or Journal name as passed into
** xOpen.
*/
sqlite3_file *sqlite3_database_file_object(const char *zName){
Pager *pPager;
while( zName[-1]!=0 || zName[-2]!=0 || zName[-3]!=0 || zName[-4]!=0 ){
zName--;
}
pPager = *(Pager**)(zName - 4 - sizeof(Pager*));
return pPager->fd;
}
/*