Start preparing for 1.8.4.2
[alt-git.git] / show-index.c
blob5a9eed7fd858b6f2e454421d68e884a21acb7a23
1 #include "cache.h"
2 #include "pack.h"
4 static const char show_index_usage[] =
5 "git show-index < <packed archive index>";
7 int main(int argc, char **argv)
9 int i;
10 unsigned nr;
11 unsigned int version;
12 static unsigned int top_index[256];
14 git_setup_gettext();
16 if (argc != 1)
17 usage(show_index_usage);
18 if (fread(top_index, 2 * 4, 1, stdin) != 1)
19 die("unable to read header");
20 if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {
21 version = ntohl(top_index[1]);
22 if (version < 2 || version > 2)
23 die("unknown index version");
24 if (fread(top_index, 256 * 4, 1, stdin) != 1)
25 die("unable to read index");
26 } else {
27 version = 1;
28 if (fread(&top_index[2], 254 * 4, 1, stdin) != 1)
29 die("unable to read index");
31 nr = 0;
32 for (i = 0; i < 256; i++) {
33 unsigned n = ntohl(top_index[i]);
34 if (n < nr)
35 die("corrupt index file");
36 nr = n;
38 if (version == 1) {
39 for (i = 0; i < nr; i++) {
40 unsigned int offset, entry[6];
42 if (fread(entry, 4 + 20, 1, stdin) != 1)
43 die("unable to read entry %u/%u", i, nr);
44 offset = ntohl(entry[0]);
45 printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1)));
47 } else {
48 unsigned off64_nr = 0;
49 struct {
50 unsigned char sha1[20];
51 uint32_t crc;
52 uint32_t off;
53 } *entries = xmalloc(nr * sizeof(entries[0]));
54 for (i = 0; i < nr; i++)
55 if (fread(entries[i].sha1, 20, 1, stdin) != 1)
56 die("unable to read sha1 %u/%u", i, nr);
57 for (i = 0; i < nr; i++)
58 if (fread(&entries[i].crc, 4, 1, stdin) != 1)
59 die("unable to read crc %u/%u", i, nr);
60 for (i = 0; i < nr; i++)
61 if (fread(&entries[i].off, 4, 1, stdin) != 1)
62 die("unable to read 32b offset %u/%u", i, nr);
63 for (i = 0; i < nr; i++) {
64 uint64_t offset;
65 uint32_t off = ntohl(entries[i].off);
66 if (!(off & 0x80000000)) {
67 offset = off;
68 } else {
69 uint32_t off64[2];
70 if ((off & 0x7fffffff) != off64_nr)
71 die("inconsistent 64b offset index");
72 if (fread(off64, 8, 1, stdin) != 1)
73 die("unable to read 64b offset %u", off64_nr);
74 offset = (((uint64_t)ntohl(off64[0])) << 32) |
75 ntohl(off64[1]);
76 off64_nr++;
78 printf("%" PRIuMAX " %s (%08"PRIx32")\n",
79 (uintmax_t) offset,
80 sha1_to_hex(entries[i].sha1),
81 ntohl(entries[i].crc));
83 free(entries);
85 return 0;