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Overview
Comment:Do not allow a backup to change the page size if a codec is in use.
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SHA1: 5523ecd32295c188e3bf5dbd57d92d2879461e32
User & Date: drh 2010-08-20 15:32:21.000
Context
2010-08-21
15:09
Fix the ptrmapPageno() routine so that it works correctly for an input of 1. (check-in: 699a9bf283 user: drh tags: trunk)
2010-08-20
15:32
Do not allow a backup to change the page size if a codec is in use. (check-in: 5523ecd322 user: drh tags: trunk)
12:43
Fix typo in backcompat.test. (check-in: 6a0cbb272c user: dan tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/backup.c.
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  /* Catch the case where the destination is an in-memory database and the
  ** page sizes of the source and destination differ. 
  */
  if( nSrcPgsz!=nDestPgsz && sqlite3PagerIsMemdb(pDestPager) ){
    rc = SQLITE_READONLY;
  }










  /* This loop runs once for each destination page spanned by the source 
  ** page. For each iteration, variable iOff is set to the byte offset
  ** of the destination page.
  */
  for(iOff=iEnd-(i64)nSrcPgsz; rc==SQLITE_OK && iOff<iEnd; iOff+=nDestPgsz){
    DbPage *pDestPg = 0;








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  /* Catch the case where the destination is an in-memory database and the
  ** page sizes of the source and destination differ. 
  */
  if( nSrcPgsz!=nDestPgsz && sqlite3PagerIsMemdb(pDestPager) ){
    rc = SQLITE_READONLY;
  }

#ifdef SQLITE_HAS_CODEC
  /* Backup is not possible if the page size of the destination is changing
  ** a a codec is in use.
  */
  if( nSrcPgsz!=nDestPgsz && sqlite3PagerGetCodec(pDestPager)!=0 ){
    rc = SQLITE_READONLY;
  }
#endif

  /* This loop runs once for each destination page spanned by the source 
  ** page. For each iteration, variable iOff is set to the byte offset
  ** of the destination page.
  */
  for(iOff=iEnd-(i64)nSrcPgsz; rc==SQLITE_OK && iOff<iEnd; iOff+=nDestPgsz){
    DbPage *pDestPg = 0;
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