diff options
Diffstat (limited to 'third_party/git/builtin/show-index.c')
| -rw-r--r-- | third_party/git/builtin/show-index.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/third_party/git/builtin/show-index.c b/third_party/git/builtin/show-index.c new file mode 100644 index 000000000000..0826f6a5a2c2 --- /dev/null +++ b/third_party/git/builtin/show-index.c @@ -0,0 +1,87 @@ +#include "builtin.h" +#include "cache.h" +#include "pack.h" + +static const char show_index_usage[] = +"git show-index"; + +int cmd_show_index(int argc, const char **argv, const char *prefix) +{ + int i; + unsigned nr; + unsigned int version; + static unsigned int top_index[256]; + const unsigned hashsz = the_hash_algo->rawsz; + + if (argc != 1) + usage(show_index_usage); + if (fread(top_index, 2 * 4, 1, stdin) != 1) + die("unable to read header"); + if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) { + version = ntohl(top_index[1]); + if (version < 2 || version > 2) + die("unknown index version"); + if (fread(top_index, 256 * 4, 1, stdin) != 1) + die("unable to read index"); + } else { + version = 1; + if (fread(&top_index[2], 254 * 4, 1, stdin) != 1) + die("unable to read index"); + } + nr = 0; + for (i = 0; i < 256; i++) { + unsigned n = ntohl(top_index[i]); + if (n < nr) + die("corrupt index file"); + nr = n; + } + if (version == 1) { + for (i = 0; i < nr; i++) { + unsigned int offset, entry[(GIT_MAX_RAWSZ + 4) / sizeof(unsigned int)]; + + if (fread(entry, 4 + hashsz, 1, stdin) != 1) + die("unable to read entry %u/%u", i, nr); + offset = ntohl(entry[0]); + printf("%u %s\n", offset, hash_to_hex((void *)(entry+1))); + } + } else { + unsigned off64_nr = 0; + struct { + struct object_id oid; + uint32_t crc; + uint32_t off; + } *entries; + ALLOC_ARRAY(entries, nr); + for (i = 0; i < nr; i++) + if (fread(entries[i].oid.hash, hashsz, 1, stdin) != 1) + die("unable to read sha1 %u/%u", i, nr); + for (i = 0; i < nr; i++) + if (fread(&entries[i].crc, 4, 1, stdin) != 1) + die("unable to read crc %u/%u", i, nr); + for (i = 0; i < nr; i++) + if (fread(&entries[i].off, 4, 1, stdin) != 1) + die("unable to read 32b offset %u/%u", i, nr); + for (i = 0; i < nr; i++) { + uint64_t offset; + uint32_t off = ntohl(entries[i].off); + if (!(off & 0x80000000)) { + offset = off; + } else { + uint32_t off64[2]; + if ((off & 0x7fffffff) != off64_nr) + die("inconsistent 64b offset index"); + if (fread(off64, 8, 1, stdin) != 1) + die("unable to read 64b offset %u", off64_nr); + offset = (((uint64_t)ntohl(off64[0])) << 32) | + ntohl(off64[1]); + off64_nr++; + } + printf("%" PRIuMAX " %s (%08"PRIx32")\n", + (uintmax_t) offset, + oid_to_hex(&entries[i].oid), + ntohl(entries[i].crc)); + } + free(entries); + } + return 0; +} |