freshlybakedca.ke
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1#define USE_THE_REPOSITORY_VARIABLE
2#define DISABLE_SIGN_COMPARE_WARNINGS
3
4#include "builtin.h"
5#include "gettext.h"
6#include "hash.h"
7#include "hex.h"
8#include "pack.h"
9#include "parse-options.h"
10
11static const char *const show_index_usage[] = {
12 "git show-index [--object-format=<hash-algorithm>] < <pack-idx-file>",
13 NULL
14};
15
16int cmd_show_index(int argc,
17 const char **argv,
18 const char *prefix,
19 struct repository *repo UNUSED)
20{
21 int i;
22 unsigned nr;
23 unsigned int version;
24 static unsigned int top_index[256];
25 unsigned hashsz;
26 const char *hash_name = NULL;
27 int hash_algo;
28 const struct option show_index_options[] = {
29 OPT_STRING(0, "object-format", &hash_name, N_("hash-algorithm"),
30 N_("specify the hash algorithm to use")),
31 OPT_END()
32 };
33
34 argc = parse_options(argc, argv, prefix, show_index_options, show_index_usage, 0);
35
36 if (hash_name) {
37 hash_algo = hash_algo_by_name(hash_name);
38 if (hash_algo == GIT_HASH_UNKNOWN)
39 die(_("Unknown hash algorithm"));
40 repo_set_hash_algo(the_repository, hash_algo);
41 }
42
43 /*
44 * Fallback to SHA1 if we are running outside of a repository.
45 *
46 * TODO: Figure out and implement a way to detect the hash algorithm in use by the
47 * the index file passed in and use that instead.
48 */
49 if (!the_hash_algo)
50 repo_set_hash_algo(the_repository, GIT_HASH_DEFAULT);
51
52 hashsz = the_hash_algo->rawsz;
53
54 if (fread(top_index, 2 * 4, 1, stdin) != 1)
55 die("unable to read header");
56 if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {
57 version = ntohl(top_index[1]);
58 if (version < 2 || version > 2)
59 die("unknown index version");
60 if (fread(top_index, 256 * 4, 1, stdin) != 1)
61 die("unable to read index");
62 } else {
63 version = 1;
64 if (fread(&top_index[2], 254 * 4, 1, stdin) != 1)
65 die("unable to read index");
66 }
67 nr = 0;
68 for (i = 0; i < 256; i++) {
69 unsigned n = ntohl(top_index[i]);
70 if (n < nr)
71 die("corrupt index file");
72 nr = n;
73 }
74 if (version == 1) {
75 for (i = 0; i < nr; i++) {
76 unsigned int offset, entry[(GIT_MAX_RAWSZ + 4) / sizeof(unsigned int)];
77
78 if (fread(entry, 4 + hashsz, 1, stdin) != 1)
79 die("unable to read entry %u/%u", i, nr);
80 offset = ntohl(entry[0]);
81 printf("%u %s\n", offset, hash_to_hex((void *)(entry+1)));
82 }
83 } else {
84 unsigned off64_nr = 0;
85 struct {
86 struct object_id oid;
87 uint32_t crc;
88 uint32_t off;
89 } *entries;
90 ALLOC_ARRAY(entries, nr);
91 for (i = 0; i < nr; i++) {
92 if (fread(entries[i].oid.hash, hashsz, 1, stdin) != 1)
93 die("unable to read sha1 %u/%u", i, nr);
94 entries[i].oid.algo = hash_algo_by_ptr(the_hash_algo);
95 }
96 for (i = 0; i < nr; i++)
97 if (fread(&entries[i].crc, 4, 1, stdin) != 1)
98 die("unable to read crc %u/%u", i, nr);
99 for (i = 0; i < nr; i++)
100 if (fread(&entries[i].off, 4, 1, stdin) != 1)
101 die("unable to read 32b offset %u/%u", i, nr);
102 for (i = 0; i < nr; i++) {
103 uint64_t offset;
104 uint32_t off = ntohl(entries[i].off);
105 if (!(off & 0x80000000)) {
106 offset = off;
107 } else {
108 uint32_t off64[2];
109 if ((off & 0x7fffffff) != off64_nr)
110 die("inconsistent 64b offset index");
111 if (fread(off64, 8, 1, stdin) != 1)
112 die("unable to read 64b offset %u", off64_nr);
113 offset = (((uint64_t)ntohl(off64[0])) << 32) |
114 ntohl(off64[1]);
115 off64_nr++;
116 }
117 printf("%" PRIuMAX " %s (%08"PRIx32")\n",
118 (uintmax_t) offset,
119 oid_to_hex(&entries[i].oid),
120 ntohl(entries[i].crc));
121 }
122 free(entries);
123 }
124 return 0;
125}