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Update the "showdb" debug utility to handle 64K page database and with

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extra options to decode the freelist structure.

FossilOrigin-Name: 1070918e3b68c0ba5bfab11a97214b87c601f93c
This commit is contained in:
drh
2010-08-23 15:26:49 +00:00
parent 4396fb8d48
commit 7d105f87fc
3 changed files with 83 additions and 12 deletions
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75
tool/showdb.c
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@ -35,6 +35,13 @@ static int decodeVarint(const unsigned char *z, i64 *pVal){
return 9;
}
/*
** Extract a big-endian 32-bit integer
*/
static unsigned int decodeInt32(const unsigned char *z){
return (z[0]<<24) + (z[1]<<16) + (z[2]<<8) + z[3];
}
/* Report an out-of-memory error and die.
*/
static void out_of_memory(void){
@ -246,11 +253,64 @@ static void decode_btree_page(unsigned char *a, int pgno, int hdrSize){
}
}
/*
** Decode a freelist trunk page.
*/
static void decode_trunk_page(
int pgno, /* The page number */
int pagesize, /* Size of each page */
int detail, /* Show leaf pages if true */
int recursive /* Follow the trunk change if true */
){
int n, i, k;
unsigned char *a;
while( pgno>0 ){
a = getContent((pgno-1)*pagesize, pagesize);
printf("Decode of freelist trunk page %d:\n", pgno);
print_decode_line(a, 0, 4, "Next freelist trunk page");
print_decode_line(a, 4, 4, "Number of entries on this page");
if( detail ){
n = (int)decodeInt32(&a[4]);
for(i=0; i<n; i++){
unsigned int x = decodeInt32(&a[8+4*i]);
char zIdx[10];
sprintf(zIdx, "[%d]", i);
printf(" %5s %7u", zIdx, x);
if( i%5==4 ) printf("\n");
}
if( i%5!=0 ) printf("\n");
}
if( !recursive ){
pgno = 0;
}else{
pgno = (int)decodeInt32(&a[0]);
}
free(a);
}
}
/*
** Print a usage comment
*/
static void usage(const char *argv0){
fprintf(stderr, "Usage %s FILENAME ?args...?\n\n", argv0);
fprintf(stderr,
"args:\n"
" dbheader Show database header\n"
" NNN..MMM Show hex of pages NNN through MMM\n"
" NNN..end Show hex of pages NNN through end of file\n"
" NNNb Decode btree page NNN\n"
" NNNt Decode freelist trunk page NNN\n"
" NNNtd Show leave freelist pages on the decode\n"
" NNNtr Recurisvely decode freelist starting at NNN\n"
);
}
int main(int argc, char **argv){
struct stat sbuf;
unsigned char zPgSz[2];
if( argc<2 ){
fprintf(stderr,"Usage: %s FILENAME ?PAGE? ...\n", argv[0]);
usage(argv[0]);
exit(1);
}
db = open(argv[1], O_RDONLY);
@ -262,7 +322,7 @@ int main(int argc, char **argv){
zPgSz[1] = 0;
lseek(db, 16, SEEK_SET);
read(db, zPgSz, 2);
pagesize = zPgSz[0]*256 + zPgSz[1];
pagesize = zPgSz[0]*256 + zPgSz[1]*65536;
if( pagesize==0 ) pagesize = 1024;
printf("Pagesize: %d\n", pagesize);
fstat(db, &sbuf);
@ -304,6 +364,17 @@ int main(int argc, char **argv){
decode_btree_page(a, iStart, hdrSize);
free(a);
continue;
}else if( zLeft && zLeft[0]=='t' ){
unsigned char *a;
int detail = 0;
int recursive = 0;
int i;
for(i=1; zLeft[i]; i++){
if( zLeft[i]=='r' ) recursive = 1;
if( zLeft[i]=='d' ) detail = 1;
}
decode_trunk_page(iStart, pagesize, detail, recursive);
continue;
}else{
iEnd = iStart;
}