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Fix the ptrmapPageno() routine so that it works correctly for an input of 1.

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FossilOrigin-Name: 699a9bf28377f43f58c509878cce60cb906dbf48
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drh
2010-08-21 15:09:37 +00:00
parent 871919b493
commit 5f77b2e0ea
3 changed files with 15 additions and 10 deletions
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5
src/btree.c
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@@ -730,11 +730,16 @@ int sqlite3BtreeCursorHasMoved(BtCursor *pCur, int *pHasMoved){
** Given a page number of a regular database page, return the page
** number for the pointer-map page that contains the entry for the
** input page number.
**
** Return 0 (not a valid page) for pgno==1 since there is
** no pointer map associated with page 1. The integrity_check logic
** requires that ptrmapPageno(*,1)!=1.
*/
static Pgno ptrmapPageno(BtShared *pBt, Pgno pgno){
int nPagesPerMapPage;
Pgno iPtrMap, ret;
assert( sqlite3_mutex_held(pBt->mutex) );
if( pgno<2 ) return 0;
nPagesPerMapPage = (pBt->usableSize/5)+1;
iPtrMap = (pgno-2)/nPagesPerMapPage;
ret = (iPtrMap*nPagesPerMapPage) + 2;