1#include "cache.h"
2#include "pack.h"
3static const char show_index_usage[] =
5"git show-index";
6int cmd_main(int argc, const char **argv)
8{
9 int i;
10 unsigned nr;
11 unsigned int version;
12 static unsigned int top_index[256];
13 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];
39 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;
52 ALLOC_ARRAY(entries, nr);
53 for (i = 0; i < nr; i++)
54 if (fread(entries[i].sha1, 20, 1, stdin) != 1)
55 die("unable to read sha1 %u/%u", i, nr);
56 for (i = 0; i < nr; i++)
57 if (fread(&entries[i].crc, 4, 1, stdin) != 1)
58 die("unable to read crc %u/%u", i, nr);
59 for (i = 0; i < nr; i++)
60 if (fread(&entries[i].off, 4, 1, stdin) != 1)
61 die("unable to read 32b offset %u/%u", i, nr);
62 for (i = 0; i < nr; i++) {
63 uint64_t offset;
64 uint32_t off = ntohl(entries[i].off);
65 if (!(off & 0x80000000)) {
66 offset = off;
67 } else {
68 uint32_t off64[2];
69 if ((off & 0x7fffffff) != off64_nr)
70 die("inconsistent 64b offset index");
71 if (fread(off64, 8, 1, stdin) != 1)
72 die("unable to read 64b offset %u", off64_nr);
73 offset = (((uint64_t)ntohl(off64[0])) << 32) |
74 ntohl(off64[1]);
75 off64_nr++;
76 }
77 printf("%" PRIuMAX " %s (%08"PRIx32")\n",
78 (uintmax_t) offset,
79 sha1_to_hex(entries[i].sha1),
80 ntohl(entries[i].crc));
81 }
82 free(entries);
83 }
84 return 0;
85}