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git-unpack-objects: start parsing the actual packed data

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So far we just print out the type and size.
This commit is contained in:
Linus Torvalds
2005-06-25 15:59:31 -07:00
parent d38c3721a1
commit 7453695831
1 changed files with 58 additions and 5 deletions
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63
unpack-objects.c
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@ -1,5 +1,7 @@
#include "cache.h" #include "cache.h"
#include "object.h"
static int dry_run;
static int nr_entries; static int nr_entries;
static const char *base_name; static const char *base_name;
static const char unpack_usage[] = "git-unpack-objects basename"; static const char unpack_usage[] = "git-unpack-objects basename";
@ -9,6 +11,9 @@ struct pack_entry {
unsigned char sha1[20]; unsigned char sha1[20];
}; };
static void *pack_base;
static unsigned long pack_size;
static struct pack_entry **pack_list; static struct pack_entry **pack_list;
static void *map_file(const char *suffix, unsigned long *sizep) static void *map_file(const char *suffix, unsigned long *sizep)
@ -63,7 +68,7 @@ static int check_index(void *index, unsigned long idx_size)
nr = n; nr = n;
} }
if (idx_size != 4*256 + nr * 24) { if (idx_size != 4*256 + nr * 24) {
printf("idx_size=%d, expected %d (%d)\n", idx_size, 4*256 + nr * 24, nr); printf("idx_size=%lu, expected %u (%u)\n", idx_size, 4*256 + nr * 24, nr);
return error("wrong index file size"); return error("wrong index file size");
} }
@ -78,17 +83,64 @@ static int check_index(void *index, unsigned long idx_size)
return 0; return 0;
} }
static void unpack_entry(struct pack_entry *entry)
{
unsigned long size;
unsigned long offset;
unsigned char *pack;
/* Have we done this one already due to deltas based on it? */
if (lookup_object(entry->sha1))
return;
offset = ntohl(entry->offset);
if (offset > pack_size - 5)
die("object offset outside of pack file");
pack = pack_base + offset;
offset = pack_size - offset;
switch (*pack) {
case 'C': case 'T': case 'B':
size = (pack[1] << 24) + (pack[2] << 16) + (pack[3] << 8) + pack[4];
printf("%s %c %lu\n", sha1_to_hex(entry->sha1), *pack, size);
break;
case 'D':
printf("%s D", sha1_to_hex(entry->sha1));
printf(" %s\n", sha1_to_hex(pack+1));
break;
default:
die("corrupted pack file");
}
}
/*
* We unpack from the end, older files first. Now, usually
* there are deltas etc, so we'll not actually write the
* objects in that order, but we might as well try..
*/
static void unpack_all(void)
{
int i = nr_entries;
while (--i >= 0) {
struct pack_entry *entry = pack_list[i];
unpack_entry(entry);
}
}
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
int i; int i;
unsigned long idx_size, pack_size; unsigned long idx_size;
void *index, *pack; void *index;
for (i = 1 ; i < argc; i++) { for (i = 1 ; i < argc; i++) {
const char *arg = argv[i]; const char *arg = argv[i];
if (*arg == '-') { if (*arg == '-') {
/* Maybe we'll have some flags here some day.. */ if (!strcmp(arg, "-n")) {
dry_run = 1;
continue;
}
usage(unpack_usage); usage(unpack_usage);
} }
if (base_name) if (base_name)
@ -98,8 +150,9 @@ int main(int argc, char **argv)
if (!base_name) if (!base_name)
usage(unpack_usage); usage(unpack_usage);
index = map_file("idx", &idx_size); index = map_file("idx", &idx_size);
pack = map_file("pack", &pack_size); pack_base = map_file("pack", &pack_size);
if (check_index(index, idx_size) < 0) if (check_index(index, idx_size) < 0)
die("bad index file"); die("bad index file");
unpack_all();
return 0; return 0;
} }