Adding upstream version 3.40.1.upstream/3.40.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 68 insertions, 0 deletions

diff --git a/tool/enlargedb.c b/tool/enlargedb.c
new file mode 100644
index 0000000..dab5ef1
--- /dev/null
+++ b/tool/enlargedb.c
@@ -0,0 +1,68 @@
+/*
+** Try to enlarge an SQLite database by appending many unused pages.
+** The resulting database will fail PRAGMA integrity_check due to the
+** appended unused pages, but it should work otherwise.
+**
+** Usage:
+**
+**        enlargedb  DATABASE   N
+**
+** Adds N blank pages onto the end of DATABASE.  N can be decimal
+** or hex.  The total number of pages after adding must be no greater
+** than 4294967297
+*/
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv){
+  char *zEnd;
+  long long int toAppend;
+  long long int currentSz;
+  long long int newSz;
+  FILE *f;
+  size_t got;
+  int pgsz;
+  char zero = 0;
+  unsigned char buf[100];
+
+  if( argc!=3 ) goto usage_error;
+  toAppend = strtoll(argv[2], &zEnd, 0);
+  if( zEnd==argv[2] || zEnd[0] ) goto usage_error;
+  if( toAppend<1 ){
+    fprintf(stderr, "N must be at least 1\n");
+    exit(1);
+  }
+  f = fopen(argv[1], "r+b");
+  if( f==0 ){
+    fprintf(stderr, "cannot open \"%s\" for reading and writing\n", argv[1]);
+    exit(1);
+  }
+  got = fread(buf, 1, sizeof(buf), f);
+  if( got!=sizeof(buf) ) goto not_valid_db;
+  if( strcmp((char*)buf,"SQLite format 3")!=0 ) goto not_valid_db;
+  pgsz = (buf[16]<<8) + buf[17];
+  if( pgsz==1 ) pgsz = 65536;
+  if( pgsz<512 || pgsz>65536 || (pgsz&(pgsz-1))!=0 ) goto not_valid_db;
+  currentSz = (buf[28]<<24) + (buf[29]<<16) + (buf[30]<<8) + buf[31];
+  newSz = currentSz + toAppend;
+  if( newSz > 0xffffffff ) newSz = 0xffffffff;
+  buf[28] = (newSz>>24) & 0xff;
+  buf[29] = (newSz>>16) & 0xff;
+  buf[30] = (newSz>>8) & 0xff;
+  buf[31] = newSz & 0xff;
+  fseek(f, 28, SEEK_SET);
+  fwrite(&buf[28],4,1,f);
+  fseek(f, (long)(newSz*pgsz - 1), SEEK_SET);
+  fwrite(&zero,1,1,f);
+  fclose(f);
+  return 0;  
+
+not_valid_db:
+  fprintf(stderr,"not a valid database: %s\n", argv[1]);
+  exit(1);  
+
+usage_error:
+  fprintf(stderr,"Usage: %s DATABASE N\n", argv[0]);
+  exit(1);
+}