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-rw-r--r--builtin/show-index.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/builtin/show-index.c b/builtin/show-index.c
new file mode 100644
index 0000000..540dc3d
--- /dev/null
+++ b/builtin/show-index.c
@@ -0,0 +1,111 @@
+#include "builtin.h"
+#include "gettext.h"
+#include "hash.h"
+#include "hex.h"
+#include "pack.h"
+#include "parse-options.h"
+#include "repository.h"
+
+static const char *const show_index_usage[] = {
+ "git show-index [--object-format=<hash-algorithm>]",
+ NULL
+};
+
+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];
+ unsigned hashsz;
+ const char *hash_name = NULL;
+ int hash_algo;
+ const struct option show_index_options[] = {
+ OPT_STRING(0, "object-format", &hash_name, N_("hash-algorithm"),
+ N_("specify the hash algorithm to use")),
+ OPT_END()
+ };
+
+ argc = parse_options(argc, argv, prefix, show_index_options, show_index_usage, 0);
+
+ if (hash_name) {
+ hash_algo = hash_algo_by_name(hash_name);
+ if (hash_algo == GIT_HASH_UNKNOWN)
+ die(_("Unknown hash algorithm"));
+ repo_set_hash_algo(the_repository, hash_algo);
+ }
+
+ hashsz = the_hash_algo->rawsz;
+
+ 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);
+ entries[i].oid.algo = hash_algo_by_ptr(the_hash_algo);
+ }
+ 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;
+}