From: drh <drh@noemail.net>
Date: Fri, 25 Jan 2013 15:09:41 +0000 (+0000)
Subject: Enhance the "showwal" utility program to show checksum failures on frames.
X-Git-Tag: version-3.7.16~64
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d63ce044d13e5aa80257a62fec58cfc9f12e0cd5;p=thirdparty%2Fsqlite.git

Enhance the "showwal" utility program to show checksum failures on frames.

FossilOrigin-Name: a7f6d19816cbfc50060a9d1c0c402cdd23bd16de
---

diff --git a/manifest b/manifest
index 0922ce4694..51a92ffab4 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Improved\sparsing\sof\sthe\sarguments\sto\sthe\s".backup"\scommand\sin\sthe\s\ncommand-line\sshell.
-D 2013-01-23T18:53:23.246
+C Enhance\sthe\s"showwal"\sutility\sprogram\sto\sshow\schecksum\sfailures\son\sframes.
+D 2013-01-25T15:09:41.890
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in a48faa9e7dd7d556d84f5456eabe5825dd8a6282
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -1016,7 +1016,7 @@ F tool/restore_jrnl.tcl 6957a34f8f1f0f8285e07536225ec3b292a9024a
 F tool/rollback-test.c 9fc98427d1e23e84429d7e6d07d9094fbdec65a5
 F tool/showdb.c aca2644aa4de7c0cad5821e50bbd55397e0974b8
 F tool/showjournal.c b62cecaab86a4053d944c276bb5232e4d17ece02
-F tool/showwal.c f09e5a80a293919290ec85a6a37c85a5ddcf37d9
+F tool/showwal.c 2ef22ea67806f0e9fdba8083989c30e4bf4002e3
 F tool/soak1.tcl 8d407956e1a45b485a8e072470a3e629a27037fe
 F tool/space_used.tcl f714c41a59e326b8b9042f415b628b561bafa06b
 F tool/spaceanal.tcl 76f583a246a0b027f423252339e711f13198932e
@@ -1034,7 +1034,7 @@ F tool/vdbe-compress.tcl f12c884766bd14277f4fcedcae07078011717381
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
 F tool/win/sqlite.vsix 97894c2790eda7b5bce3cc79cb2a8ec2fde9b3ac
-P 5bfb5967d70433bf41d39b57506b7ec167a1b6a0
-R 08c8109626ac00561b249e6640d8f589
+P f1127e87b90c7ba049404ec68cb4e99009c22185
+R 20e35b503c10c06065f1e1625b37816e
 U drh
-Z c715715f0fc3823fbef7e95ac29cf308
+Z fa08d05e69180548469496ecb5ae134e
diff --git a/manifest.uuid b/manifest.uuid
index 60af10143c..4d78dcc71a 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-f1127e87b90c7ba049404ec68cb4e99009c22185
\ No newline at end of file
+a7f6d19816cbfc50060a9d1c0c402cdd23bd16de
\ No newline at end of file
diff --git a/tool/showwal.c b/tool/showwal.c
index ae25a59f9a..681291a7db 100644
--- a/tool/showwal.c
+++ b/tool/showwal.c
@@ -18,6 +18,65 @@ static int perLine = 16;        /* HEX elements to print per line */
 
 typedef long long int i64;      /* Datatype for 64-bit integers */
 
+/* Information for computing the checksum */
+typedef struct Cksum Cksum;
+struct Cksum {
+  int bSwap;           /* True to do byte swapping on 32-bit words */
+  unsigned s0, s1;     /* Current checksum value */
+};
+
+/*
+** extract a 32-bit big-endian integer
+*/
+static unsigned int getInt32(const unsigned char *a){
+  unsigned int x = (a[0]<<24) + (a[1]<<16) + (a[2]<<8) + a[3];
+  return x;
+}
+
+/*
+** Swap bytes on a 32-bit unsigned integer
+*/
+static unsigned int swab32(unsigned int x){
+  return (((x)&0x000000FF)<<24) + (((x)&0x0000FF00)<<8)
+         + (((x)&0x00FF0000)>>8)  + (((x)&0xFF000000)>>24);
+}
+
+/* Extend the checksum.  Reinitialize the checksum if bInit is true.
+*/
+static void extendCksum(
+  Cksum *pCksum,
+  unsigned char *aData,
+  unsigned int nByte,
+  int bInit
+){
+  unsigned int *a32;
+  if( bInit ){
+    int a = 0;
+    *((char*)&a) = 1;
+    if( a==1 ){
+      /* Host is little-endian */
+      pCksum->bSwap = getInt32(aData)!=0x377f0682;
+    }else{
+      /* Host is big-endian */
+      pCksum->bSwap = getInt32(aData)!=0x377f0683;
+    }
+    pCksum->s0 = 0;
+    pCksum->s1 = 0;
+  }
+  a32 = (unsigned int*)aData;
+  while( nByte>0 ){
+    unsigned int x0 = a32[0];
+    unsigned int x1 = a32[1];
+    if( pCksum->bSwap ){
+      x0 = swab32(x0);
+      x1 = swab32(x1);
+    }
+    pCksum->s0 += x0 + pCksum->s1;
+    pCksum->s1 += x1 + pCksum->s0;
+    nByte -= 8;
+    a32 += 2;
+  }
+}
 
 /*
 ** Convert the var-int format into i64.  Return the number of bytes
@@ -152,29 +211,27 @@ static void print_frame(int iFrame){
 }
 
 /*
-** extract a 32-bit big-endian integer
+** Summarize a single frame on a single line.
 */
-static unsigned int getInt32(const unsigned char *a){
-  unsigned int x = (a[0]<<24) + (a[1]<<16) + (a[2]<<8) + a[3];
-  return x;
-}
-
-/*
-** Print an entire page of content as hex
-*/
-static void print_oneline_frame(int iFrame){
+static void print_oneline_frame(int iFrame, Cksum *pCksum){
   int iStart;
   unsigned char *aData;
+  unsigned int s0, s1;
   iStart = 32 + (iFrame-1)*(pagesize+24);
   aData = getContent(iStart, 24);
-  fprintf(stdout, "Frame %4d: %6d %6d 0x%08x 0x%08x 0x%08x 0x%08x\n",
+  extendCksum(pCksum, aData, 8, 0);
+  extendCksum(pCksum, getContent(iStart+24, pagesize), pagesize, 0);
+  s0 = getInt32(aData+16);
+  s1 = getInt32(aData+20);
+  fprintf(stdout, "Frame %4d: %6d %6d 0x%08x,%08x 0x%08x,%08x %s\n",
           iFrame, 
           getInt32(aData),
           getInt32(aData+4),
           getInt32(aData+8),
           getInt32(aData+12),
-          getInt32(aData+16),
-          getInt32(aData+20)
+          s0,
+          s1,
+          (s0==pCksum->s0 && s1==pCksum->s1) ? "cksum-ok" : "cksum-fail"
   );
   free(aData);
 }
@@ -182,9 +239,13 @@ static void print_oneline_frame(int iFrame){
 /*
 ** Decode the WAL header.
 */
-static void print_wal_header(void){
+static void print_wal_header(Cksum *pCksum){
   unsigned char *aData;
   aData = getContent(0, 32);
+  if( pCksum ){
+    extendCksum(pCksum, aData, 24, 1);
+    printf("Checksum byte order: %s\n", pCksum->bSwap ? "swapped" : "native");
+  }
   printf("WAL Header:\n");
   print_decode_line(aData, 0, 4,1,"Magic.  0x377f0682 (le) or 0x377f0683 (be)");
   print_decode_line(aData, 4, 4, 0, "File format");
@@ -194,6 +255,14 @@ static void print_wal_header(void){
   print_decode_line(aData, 20,4, 1, "Salt-2");
   print_decode_line(aData, 24,4, 1, "Checksum-1");
   print_decode_line(aData, 28,4, 1, "Checksum-2");
+  if( pCksum ){
+    if( pCksum->s0!=getInt32(aData+24) ){
+      printf("**** cksum-1 mismatch: 0x%08x\n", pCksum->s0);
+    }
+    if( pCksum->s1!=getInt32(aData+28) ){
+      printf("**** cksum-2 mismatch: 0x%08x\n", pCksum->s1);
+    }
+  }
   free(aData);
 }
 
@@ -298,15 +367,18 @@ int main(int argc, char **argv){
   printf("Available pages: 1..%d\n", mxFrame);
   if( argc==2 ){
     int i;
-    print_wal_header();
-    for(i=1; i<=mxFrame; i++) print_oneline_frame(i);
+    Cksum x;
+    print_wal_header(&x);
+    for(i=1; i<=mxFrame; i++){
+      print_oneline_frame(i, &x);
+    }
   }else{
     int i;
     for(i=2; i<argc; i++){
       int iStart, iEnd;
       char *zLeft;
       if( strcmp(argv[i], "header")==0 ){
-        print_wal_header();
+        print_wal_header(0);
         continue;
       }
       if( !isdigit(argv[i][0]) ){