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authorNicolas Pitre <nico@cam.org>2008-06-24 23:19:02 -0400
committerJunio C Hamano <gitster@pobox.com>2008-06-24 23:58:57 -0700
commitc41a4a9468b0c728e77ec5d97da7bfb63776ac3f (patch)
tree6f17dc7359d8edae4043aa06a50eb88cba8d4304 /pack-check.c
parent77d3ecee85dbf354d2059d7ef65d788d90db3efa (diff)
downloadgit-c41a4a9468b0c728e77ec5d97da7bfb63776ac3f.tar.gz
verify-pack: check packed object CRC when using index version 2
To do so, check_pack_crc() moved from builtin-pack-objects.c to pack-check.c where it is more logical to share. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'pack-check.c')
-rw-r--r--pack-check.c39
1 files changed, 37 insertions, 2 deletions
diff --git a/pack-check.c b/pack-check.c
index 5f02a65b6e..f596bf2db5 100644
--- a/pack-check.c
+++ b/pack-check.c
@@ -4,8 +4,9 @@
struct idx_entry
{
- const unsigned char *sha1;
off_t offset;
+ const unsigned char *sha1;
+ unsigned int nr;
};
static int compare_entries(const void *e1, const void *e2)
@@ -19,6 +20,28 @@ static int compare_entries(const void *e1, const void *e2)
return 0;
}
+int check_pack_crc(struct packed_git *p, struct pack_window **w_curs,
+ off_t offset, off_t len, unsigned int nr)
+{
+ const uint32_t *index_crc;
+ uint32_t data_crc = crc32(0, Z_NULL, 0);
+
+ do {
+ unsigned int avail;
+ void *data = use_pack(p, w_curs, offset, &avail);
+ if (avail > len)
+ avail = len;
+ data_crc = crc32(data_crc, data, avail);
+ offset += avail;
+ len -= avail;
+ } while (len);
+
+ index_crc = p->index_data;
+ index_crc += 2 + 256 + p->num_objects * (20/4) + nr;
+
+ return data_crc != ntohl(*index_crc);
+}
+
static int verify_packfile(struct packed_git *p,
struct pack_window **w_curs)
{
@@ -61,13 +84,15 @@ static int verify_packfile(struct packed_git *p,
* we do not do scan-streaming check on the pack file.
*/
nr_objects = p->num_objects;
- entries = xmalloc(nr_objects * sizeof(*entries));
+ entries = xmalloc((nr_objects + 1) * sizeof(*entries));
+ entries[nr_objects].offset = pack_sig_ofs;
/* first sort entries by pack offset, since unpacking them is more efficient that way */
for (i = 0; i < nr_objects; i++) {
entries[i].sha1 = nth_packed_object_sha1(p, i);
if (!entries[i].sha1)
die("internal error pack-check nth-packed-object");
entries[i].offset = nth_packed_object_offset(p, i);
+ entries[i].nr = i;
}
qsort(entries, nr_objects, sizeof(*entries), compare_entries);
@@ -76,6 +101,16 @@ static int verify_packfile(struct packed_git *p,
enum object_type type;
unsigned long size;
+ if (p->index_version > 1) {
+ off_t offset = entries[i].offset;
+ off_t len = entries[i+1].offset - offset;
+ unsigned int nr = entries[i].nr;
+ if (check_pack_crc(p, w_curs, offset, len, nr))
+ err = error("index CRC mismatch for object %s "
+ "from %s at offset %"PRIuMAX"",
+ sha1_to_hex(entries[i].sha1),
+ p->pack_name, (uintmax_t)offset);
+ }
data = unpack_entry(p, entries[i].offset, &type, &size);
if (!data) {
err = error("cannot unpack %s from %s at offset %"PRIuMAX"",