From: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
Instead of parsing the table of contents directly, use the chunk-format
API methods read_table_of_contents() and pair_chunk(). In particular, we
can use the return value of pair_chunk() to generate an error when a
required chunk is missing.
Signed-off-by: Derrick Stolee <dstolee@xxxxxxxxxxxxx>
---
midx.c | 71 +++++++++++++------------------------
t/t5319-multi-pack-index.sh | 6 ++--
2 files changed, 28 insertions(+), 49 deletions(-)
diff --git a/midx.c b/midx.c
index 3585e04a706..e94dcd34b7f 100644
--- a/midx.c
+++ b/midx.c
@@ -54,6 +54,19 @@ static char *get_midx_filename(const char *object_dir)
return xstrfmt("%s/pack/multi-pack-index", object_dir);
}
+static int midx_read_oid_fanout(const unsigned char *chunk_start,
+ size_t chunk_size, void *data)
+{
+ struct multi_pack_index *m = data;
+ m->chunk_oid_fanout = (uint32_t *)chunk_start;
+
+ if (chunk_size != 4 * 256) {
+ error(_("multi-pack-index OID fanout is of the wrong size"));
+ return 1;
+ }
+ return 0;
+}
+
struct multi_pack_index *load_multi_pack_index(const char *object_dir, int local)
{
struct multi_pack_index *m = NULL;
@@ -65,6 +78,7 @@ struct multi_pack_index *load_multi_pack_index(const char *object_dir, int local
char *midx_name = get_midx_filename(object_dir);
uint32_t i;
const char *cur_pack_name;
+ struct chunkfile *cf = NULL;
fd = git_open(midx_name);
@@ -114,58 +128,23 @@ struct multi_pack_index *load_multi_pack_index(const char *object_dir, int local
m->num_packs = get_be32(m->data + MIDX_BYTE_NUM_PACKS);
- for (i = 0; i < m->num_chunks; i++) {
- uint32_t chunk_id = get_be32(m->data + MIDX_HEADER_SIZE +
- MIDX_CHUNKLOOKUP_WIDTH * i);
- uint64_t chunk_offset = get_be64(m->data + MIDX_HEADER_SIZE + 4 +
- MIDX_CHUNKLOOKUP_WIDTH * i);
-
- if (chunk_offset >= m->data_len)
- die(_("invalid chunk offset (too large)"));
-
- switch (chunk_id) {
- case MIDX_CHUNKID_PACKNAMES:
- m->chunk_pack_names = m->data + chunk_offset;
- break;
-
- case MIDX_CHUNKID_OIDFANOUT:
- m->chunk_oid_fanout = (uint32_t *)(m->data + chunk_offset);
- break;
-
- case MIDX_CHUNKID_OIDLOOKUP:
- m->chunk_oid_lookup = m->data + chunk_offset;
- break;
-
- case MIDX_CHUNKID_OBJECTOFFSETS:
- m->chunk_object_offsets = m->data + chunk_offset;
- break;
-
- case MIDX_CHUNKID_LARGEOFFSETS:
- m->chunk_large_offsets = m->data + chunk_offset;
- break;
-
- case 0:
- die(_("terminating multi-pack-index chunk id appears earlier than expected"));
- break;
-
- default:
- /*
- * Do nothing on unrecognized chunks, allowing future
- * extensions to add optional chunks.
- */
- break;
- }
- }
+ cf = init_chunkfile(NULL);
- if (!m->chunk_pack_names)
+ if (read_table_of_contents(cf, m->data, midx_size,
+ MIDX_HEADER_SIZE, m->num_chunks))
+ goto cleanup_fail;
+
+ if (pair_chunk(cf, MIDX_CHUNKID_PACKNAMES, &m->chunk_pack_names) == CHUNK_NOT_FOUND)
die(_("multi-pack-index missing required pack-name chunk"));
- if (!m->chunk_oid_fanout)
+ if (read_chunk(cf, MIDX_CHUNKID_OIDFANOUT, midx_read_oid_fanout, m) == CHUNK_NOT_FOUND)
die(_("multi-pack-index missing required OID fanout chunk"));
- if (!m->chunk_oid_lookup)
+ if (pair_chunk(cf, MIDX_CHUNKID_OIDLOOKUP, &m->chunk_oid_lookup) == CHUNK_NOT_FOUND)
die(_("multi-pack-index missing required OID lookup chunk"));
- if (!m->chunk_object_offsets)
+ if (pair_chunk(cf, MIDX_CHUNKID_OBJECTOFFSETS, &m->chunk_object_offsets) == CHUNK_NOT_FOUND)
die(_("multi-pack-index missing required object offsets chunk"));
+ pair_chunk(cf, MIDX_CHUNKID_LARGEOFFSETS, &m->chunk_large_offsets);
+
m->num_objects = ntohl(m->chunk_oid_fanout[255]);
m->pack_names = xcalloc(m->num_packs, sizeof(*m->pack_names));
diff --git a/t/t5319-multi-pack-index.sh b/t/t5319-multi-pack-index.sh
index 297de502a94..ad4e878b65b 100755
--- a/t/t5319-multi-pack-index.sh
+++ b/t/t5319-multi-pack-index.sh
@@ -314,12 +314,12 @@ test_expect_success 'verify bad OID version' '
test_expect_success 'verify truncated chunk count' '
corrupt_midx_and_verify $MIDX_BYTE_CHUNK_COUNT "\01" $objdir \
- "missing required"
+ "final chunk has non-zero id"
'
test_expect_success 'verify extended chunk count' '
corrupt_midx_and_verify $MIDX_BYTE_CHUNK_COUNT "\07" $objdir \
- "terminating multi-pack-index chunk id appears earlier than expected"
+ "terminating chunk id appears earlier than expected"
'
test_expect_success 'verify missing required chunk' '
@@ -329,7 +329,7 @@ test_expect_success 'verify missing required chunk' '
test_expect_success 'verify invalid chunk offset' '
corrupt_midx_and_verify $MIDX_BYTE_CHUNK_OFFSET "\01" $objdir \
- "invalid chunk offset (too large)"
+ "improper chunk offset(s)"
'
test_expect_success 'verify packnames out of order' '
--
gitgitgadget
