Windows: boost startup by avoiding a static dependency on shell32.dll
[git/dscho.git] / show-index.c
blob63f9da53237d4233bede66a28e4bcf27d5b44af1
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         if (argc != 1)
15                 usage(show_index_usage);
16         if (fread(top_index, 2 * 4, 1, stdin) != 1)
17                 die("unable to read header");
18         if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {
19                 version = ntohl(top_index[1]);
20                 if (version < 2 || version > 2)
21                         die("unknown index version");
22                 if (fread(top_index, 256 * 4, 1, stdin) != 1)
23                         die("unable to read index");
24         } else {
25                 version = 1;
26                 if (fread(&top_index[2], 254 * 4, 1, stdin) != 1)
27                         die("unable to read index");
28         }
29         nr = 0;
30         for (i = 0; i < 256; i++) {
31                 unsigned n = ntohl(top_index[i]);
32                 if (n < nr)
33                         die("corrupt index file");
34                 nr = n;
35         }
36         if (version == 1) {
37                 for (i = 0; i < nr; i++) {
38                         unsigned int offset, entry[6];
40                         if (fread(entry, 4 + 20, 1, stdin) != 1)
41                                 die("unable to read entry %u/%u", i, nr);
42                         offset = ntohl(entry[0]);
43                         printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1)));
44                 }
45         } else {
46                 unsigned off64_nr = 0;
47                 struct {
48                         unsigned char sha1[20];
49                         uint32_t crc;
50                         uint32_t off;
51                 } *entries = xmalloc(nr * sizeof(entries[0]));
52                 for (i = 0; i < nr; i++)
53                         if (fread(entries[i].sha1, 20, 1, stdin) != 1)
54                                 die("unable to read sha1 %u/%u", i, nr);
55                 for (i = 0; i < nr; i++)
56                         if (fread(&entries[i].crc, 4, 1, stdin) != 1)
57                                 die("unable to read crc %u/%u", i, nr);
58                 for (i = 0; i < nr; i++)
59                         if (fread(&entries[i].off, 4, 1, stdin) != 1)
60                                 die("unable to read 32b offset %u/%u", i, nr);
61                 for (i = 0; i < nr; i++) {
62                         uint64_t offset;
63                         uint32_t off = ntohl(entries[i].off);
64                         if (!(off & 0x80000000)) {
65                                 offset = off;
66                         } else {
67                                 uint32_t off64[2];
68                                 if ((off & 0x7fffffff) != off64_nr)
69                                         die("inconsistent 64b offset index");
70                                 if (fread(off64, 8, 1, stdin) != 1)
71                                         die("unable to read 64b offset %u", off64_nr);
72                                 offset = (((uint64_t)ntohl(off64[0])) << 32) |
73                                                      ntohl(off64[1]);
74                                 off64_nr++;
75                         }
76                         printf("%" PRIuMAX " %s (%08"PRIx32")\n",
77                                (uintmax_t) offset,
78                                sha1_to_hex(entries[i].sha1),
79                                ntohl(entries[i].crc));
80                 }
81                 free(entries);
82         }
83         return 0;