Merge branch 'ab/refspec-init-fix'
[git] / builtin / show-index.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "pack.h"
4
5 static const char show_index_usage[] =
6 "git show-index";
7
8 int cmd_show_index(int argc, const char **argv, const char *prefix)
9 {
10         int i;
11         unsigned nr;
12         unsigned int version;
13         static unsigned int top_index[256];
14
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");
29         }
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;
36         }
37         if (version == 1) {
38                 for (i = 0; i < nr; i++) {
39                         unsigned int offset, entry[6];
40
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)));
45                 }
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++;
77                         }
78                         printf("%" PRIuMAX " %s (%08"PRIx32")\n",
79                                (uintmax_t) offset,
80                                sha1_to_hex(entries[i].sha1),
81                                ntohl(entries[i].crc));
82                 }
83                 free(entries);
84         }
85         return 0;
86 }