Simplifications to the PRAGMA integrity_check logic. Remove unreachable code. (CVS 6892)

FossilOrigin-Name: 17749fa5480069cc4909acd992ab26d10afb279d

manifest

@@ -1,5 +1,5 @@
-C Simplifications\sand\stweaks\sto\svdbeaux.c\sresulting\sfrom\sstructural\stesting.\s(CVS\s6891)
-D 2009-07-14T14:15:27
+C Simplifications\sto\sthe\sPRAGMA\sintegrity_check\slogic.\s\sRemove\sunreachable\scode.\s(CVS\s6892)
+D 2009-07-14T17:48:06
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in df9359da7a726ccb67a45db905c5447d5c00c6ef
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -106,7 +106,7 @@ F src/auth.c 802a9439dfa0b8c208b10055cba400e82ef18025
 F src/backup.c 6f1c2d9862c8a3feb7739dfcca02c1f5352e37f3
 F src/bitvec.c 0ef0651714728055d43de7a4cdd95e703fac0119
 F src/btmutex.c 9b899c0d8df3bd68f527b0afe03088321b696d3c
-F src/btree.c b88edecbed1c1c46b1cfcd924ac7b759c1085af4
+F src/btree.c dcdf6af667dfeae23eaf8fac7ace3caeed632c8b
 F src/btree.h e53a10fd31d16c60a86f03c9467a6f470aa3683b
 F src/btreeInt.h a568bf057aa249eb06fd31358b4393a5ac88c118
 F src/build.c 867028ee9f63f7bc8eb8d4a720bb98cf9b9a12b4
@@ -740,7 +740,7 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl 672f81d693a03f80f5ae60bfefacd8a349e76746
-P 25dd342283046aaf66a679348ef1c7364c616402
-R f6226eddfcb83024fda164220a139368
+P fa49666fb913f0d82e84bdfa2af3a294be04e47c
+R c96e1acc2f48a31e75ce3ac536c3155e
 U drh
-Z 435b93aa97c763959298279012931682
+Z 197c424f91353d8f0b9f8ad4f802f46f

manifest.uuid

@@ -1 +1 @@
-fa49666fb913f0d82e84bdfa2af3a294be04e47c
+17749fa5480069cc4909acd992ab26d10afb279d

src/btree.c

@@ -9,7 +9,7 @@
 **    May you share freely, never taking more than you give.
 **
 *************************************************************************
-** $Id: btree.c,v 1.686 2009/07/13 13:18:07 danielk1977 Exp $
+** $Id: btree.c,v 1.687 2009/07/14 17:48:06 drh Exp $
 **
 ** This file implements a external (disk-based) database using BTrees.
 ** See the header comment on "btreeInt.h" for additional information.
@@ -7340,7 +7340,6 @@ static int checkTreePage(
   if( iPage==0 ) return 0;
   if( checkRef(pCheck, iPage, zParentContext) ) return 0;
   if( (rc = btreeGetPage(pBt, (Pgno)iPage, &pPage, 0))!=0 ){
-    if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ) pCheck->mallocFailed = 1;
     checkAppendMsg(pCheck, zContext,
        "unable to get the page. error code=%d", rc);
     return 0;
@@ -7424,11 +7423,7 @@ static int checkTreePage(
     pCheck->mallocFailed = 1;
   }else{
     u16 contentOffset = get2byte(&data[hdr+5]);
-    if (contentOffset > usableSize) {
-      checkAppendMsg(pCheck, 0, 
-                     "Corruption detected in header on page %d",iPage,0);
-      goto check_page_abort;
-    }
+    assert( contentOffset<=usableSize );  /* Enforced by btreeInitPage() */
     memset(hit+contentOffset, 0, usableSize-contentOffset);
     memset(hit, 1, contentOffset);
     nCell = get2byte(&data[hdr+3]);
@@ -7440,7 +7435,7 @@ static int checkTreePage(
       if( pc<=usableSize-4 ){
         size = cellSizePtr(pPage, &data[pc]);
       }
-      if( (pc+size-1)>=usableSize || pc<0 ){
+      if( (pc+size-1)>=usableSize ){
         checkAppendMsg(pCheck, 0, 
             "Corruption detected in cell %d on page %d",i,iPage,0);
       }else{
@@ -7474,7 +7469,6 @@ static int checkTreePage(
           cnt, data[hdr+7], iPage);
     }
   }
-check_page_abort:
   sqlite3PageFree(hit);
   releasePage(pPage);
   return depth+1;