Andrew's git / gitweb.git / show-index.c
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show-index.con commit Documentation: undocument gc'd function graph_release() (aa8dc96)
   1#include "cache.h"
   2#include "pack.h"
   3
   4int main(int argc, char **argv)
   5{
   6        int i;
   7        unsigned nr;
   8        unsigned int version;
   9        static unsigned int top_index[256];
  10
  11        if (fread(top_index, 2 * 4, 1, stdin) != 1)
  12                die("unable to read header");
  13        if (top_index[0] == htonl(PACK_IDX_SIGNATURE)) {
  14                version = ntohl(top_index[1]);
  15                if (version < 2 || version > 2)
  16                        die("unknown index version");
  17                if (fread(top_index, 256 * 4, 1, stdin) != 1)
  18                        die("unable to read index");
  19        } else {
  20                version = 1;
  21                if (fread(&top_index[2], 254 * 4, 1, stdin) != 1)
  22                        die("unable to read index");
  23        }
  24        nr = 0;
  25        for (i = 0; i < 256; i++) {
  26                unsigned n = ntohl(top_index[i]);
  27                if (n < nr)
  28                        die("corrupt index file");
  29                nr = n;
  30        }
  31        if (version == 1) {
  32                for (i = 0; i < nr; i++) {
  33                        unsigned int offset, entry[6];
  34
  35                        if (fread(entry, 4 + 20, 1, stdin) != 1)
  36                                die("unable to read entry %u/%u", i, nr);
  37                        offset = ntohl(entry[0]);
  38                        printf("%u %s\n", offset, sha1_to_hex((void *)(entry+1)));
  39                }
  40        } else {
  41                unsigned off64_nr = 0;
  42                struct {
  43                        unsigned char sha1[20];
  44                        uint32_t crc;
  45                        uint32_t off;
  46                } *entries = xmalloc(nr * sizeof(entries[0]));
  47                for (i = 0; i < nr; i++)
  48                        if (fread(entries[i].sha1, 20, 1, stdin) != 1)
  49                                die("unable to read sha1 %u/%u", i, nr);
  50                for (i = 0; i < nr; i++)
  51                        if (fread(&entries[i].crc, 4, 1, stdin) != 1)
  52                                die("unable to read crc %u/%u", i, nr);
  53                for (i = 0; i < nr; i++)
  54                        if (fread(&entries[i].off, 4, 1, stdin) != 1)
  55                                die("unable to read 32b offset %u/%u", i, nr);
  56                for (i = 0; i < nr; i++) {
  57                        uint64_t offset;
  58                        uint32_t off = ntohl(entries[i].off);
  59                        if (!(off & 0x80000000)) {
  60                                offset = off;
  61                        } else {
  62                                uint32_t off64[2];
  63                                if ((off & 0x7fffffff) != off64_nr)
  64                                        die("inconsistent 64b offset index");
  65                                if (fread(off64, 8, 1, stdin) != 1)
  66                                        die("unable to read 64b offset %u", off64_nr);
  67                                offset = (((uint64_t)ntohl(off64[0])) << 32) |
  68                                                     ntohl(off64[1]);
  69                                off64_nr++;
  70                        }
  71                        printf("%" PRIuMAX " %s (%08"PRIx32")\n",
  72                               (uintmax_t) offset,
  73                               sha1_to_hex(entries[i].sha1),
  74                               ntohl(entries[i].crc));
  75                }
  76                free(entries);
  77        }
  78        return 0;
  79}