Merge branch 'sb/object-store-alloc'
[git.git] / builtin / show-index.c
bloba6e678809efecf820405f6c626cef321a10ab253
1 #include "builtin.h"
2 #include "cache.h"
3 #include "pack.h"
5 static const char show_index_usage[] =
6 "git show-index";
8 int cmd_show_index(int argc, const char **argv, const char *prefix)
10 int i;
11 unsigned nr;
12 unsigned int version;
13 static unsigned int top_index[256];
15 if (argc != 1)
16 usage(show_index_usage);
17 if (fread(top_index, 2 * 4, 1, stdin) != 1)
18 die("unable to read header");
19 if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {
20 version = ntohl(top_index[1]);
21 if (version < 2 || version > 2)
22 die("unknown index version");
23 if (fread(top_index, 256 * 4, 1, stdin) != 1)
24 die("unable to read index");
25 } else {
26 version = 1;
27 if (fread(&top_index[2], 254 * 4, 1, stdin) != 1)
28 die("unable to read index");
30 nr = 0;
31 for (i = 0; i < 256; i++) {
32 unsigned n = ntohl(top_index[i]);
33 if (n < nr)
34 die("corrupt index file");
35 nr = n;
37 if (version == 1) {
38 for (i = 0; i < nr; i++) {
39 unsigned int offset, entry[6];
41 if (fread(entry, 4 + 20, 1, stdin) != 1)
42 die("unable to read entry %u/%u", i, nr);
43 offset = ntohl(entry[0]);
44 printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1)));
46 } else {
47 unsigned off64_nr = 0;
48 struct {
49 unsigned char sha1[20];
50 uint32_t crc;
51 uint32_t off;
52 } *entries;
53 ALLOC_ARRAY(entries, nr);
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;