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First approximation of incremental blob IO API. (CVS 3892)

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FossilOrigin-Name: c444836e7b690c16dd6acff571c613a23beb42dc
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danielk1977
2007-05-01 17:49:49 +00:00
parent cc3e986643
commit b4e9af9ff9
10 changed files with 590 additions and 20 deletions
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57
src/btree.c
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@@ -9,7 +9,7 @@
** May you share freely, never taking more than you give.
**
*************************************************************************
** $Id: btree.c,v 1.362 2007/04/30 16:55:01 danielk1977 Exp $
** $Id: btree.c,v 1.363 2007/05/01 17:49:49 danielk1977 Exp $
**
** This file implements a external (disk-based) database using BTrees.
** For a detailed discussion of BTrees, refer to
@@ -6810,6 +6810,61 @@ int sqlite3BtreeLockTable(Btree *p, int iTab, u8 isWriteLock){
}
#endif
#ifndef SQLITE_OMIT_INCRBLOB
/*
** Argument pCsr must be a cursor opened for writing on an
** INTKEY table currently pointing at a valid table entry.
** This function modifies the data stored as part of that entry.
** Only the data content may only be modified, it is not possible
** to change the length of the data stored.
*/
int sqlite3BtreePutData(BtCursor *pCsr, u32 offset, u32 amt, const void *z){
/* TODO: The following is only a stop-gap implementation. It needs
** to be made efficient using the optimistic overflow page trick.
** Similar changes need to be made to sqlite3BtreeData().
*/
i64 iKey;
int rc;
int nCopy;
u32 nData;
char *zData;
rc = sqlite3BtreeKeySize(pCsr, &iKey);
if( rc!=SQLITE_OK ){
return rc;
}
rc = sqlite3BtreeDataSize(pCsr, &nData);
if( rc!=SQLITE_OK ){
return rc;
}
zData = sqliteMalloc(nData);
if( !zData ){
return SQLITE_NOMEM;
}
rc = sqlite3BtreeData(pCsr, 0, nData, (void *)zData);
if( rc!=SQLITE_OK ){
sqliteFree(zData);
return rc;
}
nCopy = amt;
if( nCopy>(nData-offset) ){
nCopy = nData-offset;
}
if( nCopy>0 ){
memcpy(&zData[offset], z, amt);
rc = sqlite3BtreeInsert(pCsr, 0, iKey, zData, nData, 0);
}
sqliteFree(zData);
return rc;
}
#endif
/*
** The following debugging interface has to be in this file (rather
** than in, for example, test1.c) so that it can get access to