diff options
Diffstat (limited to 'builtin/index-pack.c')
| -rw-r--r-- | builtin/index-pack.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/builtin/index-pack.c b/builtin/index-pack.c index 24a9a16220..513fbbc55f 100644 --- a/builtin/index-pack.c +++ b/builtin/index-pack.c @@ -891,6 +891,51 @@ static int git_index_pack_config(const char *k, const char *v, void *cb) return git_default_config(k, v, cb); } +static int cmp_uint32(const void *a_, const void *b_) +{ + uint32_t a = *((uint32_t *)a_); + uint32_t b = *((uint32_t *)b_); + + return (a < b) ? -1 : (a != b); +} + +static void read_v2_anomalous_offsets(struct packed_git *p, + struct pack_idx_option *opts) +{ + const uint32_t *idx1, *idx2; + uint32_t i; + + /* The address of the 4-byte offset table */ + idx1 = (((const uint32_t *)p->index_data) + + 2 /* 8-byte header */ + + 256 /* fan out */ + + 5 * p->num_objects /* 20-byte SHA-1 table */ + + p->num_objects /* CRC32 table */ + ); + + /* The address of the 8-byte offset table */ + idx2 = idx1 + p->num_objects; + + for (i = 0; i < p->num_objects; i++) { + uint32_t off = ntohl(idx1[i]); + if (!(off & 0x80000000)) + continue; + off = off & 0x7fffffff; + if (idx2[off * 2]) + continue; + /* + * The real offset is ntohl(idx2[off * 2]) in high 4 + * octets, and ntohl(idx2[off * 2 + 1]) in low 4 + * octets. But idx2[off * 2] is Zero!!! + */ + ALLOC_GROW(opts->anomaly, opts->anomaly_nr + 1, opts->anomaly_alloc); + opts->anomaly[opts->anomaly_nr++] = ntohl(idx2[off * 2 + 1]); + } + + if (1 < opts->anomaly_nr) + qsort(opts->anomaly, opts->anomaly_nr, sizeof(uint32_t), cmp_uint32); +} + static void read_idx_option(struct pack_idx_option *opts, const char *pack_name) { struct packed_git *p = add_packed_git(pack_name, strlen(pack_name), 1); @@ -903,6 +948,9 @@ static void read_idx_option(struct pack_idx_option *opts, const char *pack_name) /* Read the attributes from the existing idx file */ opts->version = p->index_version; + if (opts->version == 2) + read_v2_anomalous_offsets(p, opts); + /* * Get rid of the idx file as we do not need it anymore. * NEEDSWORK: extract this bit from free_pack_by_name() in |