Fix a bug in transaction rollback during backup when the CODEC is enabled

that can result in a corrupt backup file.  This is only a problem when
SQLITE_HAS_CODEC is defined.

FossilOrigin-Name: f3398fc4db765e2c63d425d570c4469a84b3328c

manifest

@@ -1,8 +1,8 @@
 -----BEGIN PGP SIGNED MESSAGE-----
 Hash: SHA1
 
-C When\smoving\spages\sas\spart\sof\sautovacuum\son\san\sin-memory\sdatabase,\smake\ssure\nthat\sthe\ssource\slocation\sis\sjournalled\sso\sthat\sa\sROLLBACK\scan\soccur.\nPart\sof\sthe\sfix\sfor\sticket\s[564d412f15a00]
-D 2009-11-20T18:48:36
+C Fix\sa\sbug\sin\stransaction\srollback\sduring\sbackup\swhen\sthe\sCODEC\sis\senabled\nthat\scan\sresult\sin\sa\scorrupt\sbackup\sfile.\s\sThis\sis\sonly\sa\sproblem\swhen\nSQLITE_HAS_CODEC\sis\sdefined.
+D 2009-11-21T01:33:51
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in 7f6c6aa7feeeb5e26e01b344161d9aa1b5d64177
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -153,7 +153,7 @@ F src/os_common.h 240c88b163b02c21a9f21f87d49678a0aa21ff30
 F src/os_os2.c 75a8c7b9a00a2cf1a65f9fa4afbc27d46634bb2f
 F src/os_unix.c bdd6ca0932dcb51c344081aff430bcc71c14db7f
 F src/os_win.c 5ffab20249a61e0625f869efe157fa009747039b
-F src/pager.c 3c408c646d2a4adba5aedde9862ef69a27be68d8
+F src/pager.c a5c0fa9bc0dd6d04b304a35aeedee9ebd0dc2948
 F src/pager.h 1b32faf2e578ac3e7bcf9c9d11217128261c5c54
 F src/parse.y f785d814562a14dc19202f61abb4372845f64752
 F src/pcache.c 3b079306376e0e04c0d3df40c0a4b750a1839310
@@ -775,14 +775,14 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
-P cae949ce971ca216e0f8880b2f93866619fa05be
-R 2694b0c14575364b4e238f551e9978fe
+P 2f42f91fe65b0b21671936013df08037091f0cc6
+R f31a7b27b605d7a26aa89eb1b256db48
 U drh
-Z 282c516102a118903c65953429c1dd9e
+Z 06dbdf8ffebc750a1009c3d1910ae035
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manifest.uuid

@@ -1 +1 @@
-2f42f91fe65b0b21671936013df08037091f0cc6
+f3398fc4db765e2c63d425d570c4469a84b3328c

src/pager.c

@@ -1421,7 +1421,7 @@ static int pager_playback_one_page(
   PgHdr *pPg;                   /* An existing page in the cache */
   Pgno pgno;                    /* The page number of a page in journal */
   u32 cksum;                    /* Checksum used for sanity checking */
-  u8 *aData;                    /* Temporary storage for the page */
+  char *aData;                  /* Temporary storage for the page */
   sqlite3_file *jfd;            /* The file descriptor for the journal file */
 
   assert( (isMainJrnl&~1)==0 );      /* isMainJrnl is 0 or 1 */
@@ -1429,7 +1429,7 @@ static int pager_playback_one_page(
   assert( isMainJrnl || pDone );     /* pDone always used on sub-journals */
   assert( isSavepnt || pDone==0 );   /* pDone never used on non-savepoint */
 
-  aData = (u8*)pPager->pTmpSpace;
+  aData = pPager->pTmpSpace;
   assert( aData );         /* Temp storage must have already been allocated */
 
   /* Read the page number and page data from the journal or sub-journal
@@ -1438,7 +1438,7 @@ static int pager_playback_one_page(
   jfd = isMainJrnl ? pPager->jfd : pPager->sjfd;
   rc = read32bits(jfd, *pOffset, &pgno);
   if( rc!=SQLITE_OK ) return rc;
-  rc = sqlite3OsRead(jfd, aData, pPager->pageSize, (*pOffset)+4);
+  rc = sqlite3OsRead(jfd, (u8*)aData, pPager->pageSize, (*pOffset)+4);
   if( rc!=SQLITE_OK ) return rc;
   *pOffset += pPager->pageSize + 4 + isMainJrnl*4;
 
@@ -1457,7 +1457,7 @@ static int pager_playback_one_page(
   if( isMainJrnl ){
     rc = read32bits(jfd, (*pOffset)-4, &cksum);
     if( rc ) return rc;
-    if( !isSavepnt && pager_cksum(pPager, aData)!=cksum ){
+    if( !isSavepnt && pager_cksum(pPager, (u8*)aData)!=cksum ){
       return SQLITE_DONE;
     }
   }
@@ -1503,8 +1503,8 @@ static int pager_playback_one_page(
   pPg = pager_lookup(pPager, pgno);
   assert( pPg || !MEMDB );
   PAGERTRACE(("PLAYBACK %d page %d hash(%08x) %s\n",
-               PAGERID(pPager), pgno, pager_datahash(pPager->pageSize, aData),
-               (isMainJrnl?"main-journal":"sub-journal")
+           PAGERID(pPager), pgno, pager_datahash(pPager->pageSize, (u8*)aData),
+           (isMainJrnl?"main-journal":"sub-journal")
   ));
   if( (pPager->state>=PAGER_EXCLUSIVE)
    && (pPg==0 || 0==(pPg->flags&PGHDR_NEED_SYNC))
@@ -1512,14 +1512,14 @@ static int pager_playback_one_page(
    && !isUnsync
   ){
     i64 ofst = (pgno-1)*(i64)pPager->pageSize;
-    rc = sqlite3OsWrite(pPager->fd, aData, pPager->pageSize, ofst);
+    rc = sqlite3OsWrite(pPager->fd, (u8*)aData, pPager->pageSize, ofst);
     if( pgno>pPager->dbFileSize ){
       pPager->dbFileSize = pgno;
     }
     if( pPager->pBackup ){
       CODEC1(pPager, aData, pgno, 3, rc=SQLITE_NOMEM);
-      sqlite3BackupUpdate(pPager->pBackup, pgno, aData);
-      CODEC1(pPager, aData, pgno, 0, rc=SQLITE_NOMEM);
+      sqlite3BackupUpdate(pPager->pBackup, pgno, (u8*)aData);
+      CODEC2(pPager, aData, pgno, 7, rc=SQLITE_NOMEM, aData);
     }
   }else if( !isMainJrnl && pPg==0 ){
     /* If this is a rollback of a savepoint and data was not written to
@@ -1554,7 +1554,7 @@ static int pager_playback_one_page(
     */
     void *pData;
     pData = pPg->pData;
-    memcpy(pData, aData, pPager->pageSize);
+    memcpy(pData, (u8*)aData, pPager->pageSize);
     pPager->xReiniter(pPg);
     if( isMainJrnl && (!isSavepnt || *pOffset<=pPager->journalHdr) ){
       /* If the contents of this page were just restored from the main