From 7bb481fda9ecb134804b49c2ce77ca28f7eea583 Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <hans@eds.org>
Date: Fri, 30 Mar 2012 20:42:12 -0400
Subject: Imported Upstream version 2.0.3

---
 tool/showjournal.c | 139 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 tool/showjournal.c

(limited to 'tool/showjournal.c')

diff --git a/tool/showjournal.c b/tool/showjournal.c
new file mode 100644
index 0000000..5724f52
--- /dev/null
+++ b/tool/showjournal.c
@@ -0,0 +1,139 @@
+/*
+** A utility for printing an SQLite database journal.
+*/
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+** state information
+*/
+static int pageSize = 1024;
+static int sectorSize = 512;
+static FILE *db = 0;
+static int showPageContent = 0;
+static int fileSize = 0;
+static unsigned cksumNonce = 0;
+
+/* Report a memory allocation error */
+static void out_of_memory(void){
+  fprintf(stderr,"Out of memory...\n");
+  exit(1);
+}
+
+/*
+** Read N bytes of memory starting at iOfst into space obtained
+** from malloc().
+*/
+static char *read_content(int N, int iOfst){
+  int got;
+  char *pBuf = malloc(N);
+  if( pBuf==0 ) out_of_memory();
+  fseek(db, iOfst, SEEK_SET);
+  got = fread(pBuf, 1, N, db);
+  if( got<0 ){
+    fprintf(stderr, "I/O error reading %d bytes from %d\n", N, iOfst);
+    memset(pBuf, 0, N);
+  }else if( got<N ){
+    fprintf(stderr, "Short read: got only %d of %d bytes from %d\n",
+                     got, N, iOfst);
+    memset(&pBuf[got], 0, N-got);
+  }
+  return pBuf;
+}
+
+/* Print a line of decode output showing a 4-byte integer.
+*/
+static unsigned print_decode_line(
+  unsigned char *aData,      /* Content being decoded */
+  int ofst, int nByte,       /* Start and size of decode */
+  const char *zMsg           /* Message to append */
+){
+  int i, j;
+  unsigned val = aData[ofst];
+  char zBuf[100];
+  sprintf(zBuf, " %03x: %02x", ofst, aData[ofst]);
+  i = strlen(zBuf);
+  for(j=1; j<4; j++){
+    if( j>=nByte ){
+      sprintf(&zBuf[i], "   ");
+    }else{
+      sprintf(&zBuf[i], " %02x", aData[ofst+j]);
+      val = val*256 + aData[ofst+j];
+    }
+    i += strlen(&zBuf[i]);
+  }
+  sprintf(&zBuf[i], "   %10u", val);
+  printf("%s  %s\n", zBuf, zMsg);
+  return val;
+}
+
+/*
+** Read and print a journal header.  Store key information (page size, etc)
+** in global variables.
+*/
+static unsigned decode_journal_header(int iOfst){
+  char *pHdr = read_content(64, iOfst);
+  unsigned nPage;
+  printf("Header at offset %d:\n", iOfst);
+  print_decode_line(pHdr, 0, 4, "Header part 1 (3654616569)");
+  print_decode_line(pHdr, 4, 4, "Header part 2 (547447767)");
+  nPage =
+  print_decode_line(pHdr, 8, 4, "page count");
+  cksumNonce =
+  print_decode_line(pHdr, 12, 4, "chksum nonce");
+  print_decode_line(pHdr, 16, 4, "initial database size in pages");
+  sectorSize =
+  print_decode_line(pHdr, 20, 4, "sector size");
+  pageSize =
+  print_decode_line(pHdr, 24, 4, "page size");
+  print_decode_line(pHdr, 28, 4, "zero");
+  print_decode_line(pHdr, 32, 4, "zero");
+  print_decode_line(pHdr, 36, 4, "zero");
+  print_decode_line(pHdr, 40, 4, "zero");
+  free(pHdr);
+  return nPage;
+}
+
+static void print_page(int iOfst){
+  unsigned char *aData;
+  char zTitle[50];
+  aData = read_content(pageSize+8, iOfst);
+  sprintf(zTitle, "page number for page at offset %d", iOfst);
+  print_decode_line(aData, 0, 4, zTitle);
+  free(aData);
+}
+
+int main(int argc, char **argv){
+  int rc;
+  int nPage, cnt;
+  int iOfst;
+  if( argc!=2 ){
+    fprintf(stderr,"Usage: %s FILENAME\n", argv[0]);
+    exit(1);
+  }
+  db = fopen(argv[1], "rb");
+  if( db==0 ){
+    fprintf(stderr,"%s: can't open %s\n", argv[0], argv[1]);
+    exit(1);
+  }
+  fseek(db, 0, SEEK_END);
+  fileSize = ftell(db);
+  printf("journal file size: %d bytes\n", fileSize);
+  fseek(db, 0, SEEK_SET);
+  iOfst = 0;
+  while( iOfst<fileSize ){
+    cnt = nPage = (int)decode_journal_header(iOfst);
+    if( cnt==0 ){
+      cnt = (fileSize - sectorSize)/(pageSize+8);
+    }
+    iOfst += sectorSize;
+    while( cnt && iOfst<fileSize ){
+      print_page(iOfst);
+      iOfst += pageSize+8;
+    }
+    iOfst = (iOfst/sectorSize + 1)*sectorSize;
+  }
+  fclose(db);
+}
-- 
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