t/helper/test-sha1.c

   1 #include "cache.h"
   2
   3 int cmd_main(int ac, const char **av)
   4 {
   5         git_SHA_CTX ctx;
   6         unsigned char sha1[20];
   7         unsigned bufsz = 8192;
   8         int binary = 0;
   9         char *buffer;
  10
  11         if (ac == 2) {
  12                 if (!strcmp(av[1], "-b"))
  13                         binary = 1;
  14                 else
  15                         bufsz = strtoul(av[1], NULL, 10) * 1024 * 1024;
  16         }
  17
  18         if (!bufsz)
  19                 bufsz = 8192;
  20
  21         while ((buffer = malloc(bufsz)) == NULL) {
  22                 fprintf(stderr, "bufsz %u is too big, halving...\n", bufsz);
  23                 bufsz /= 2;
  24                 if (bufsz < 1024)
  25                         die("OOPS");
  26         }
  27
  28         git_SHA1_Init(&ctx);
  29
  30         while (1) {
  31                 ssize_t sz, this_sz;
  32                 char *cp = buffer;
  33                 unsigned room = bufsz;
  34                 this_sz = 0;
  35                 while (room) {
  36                         sz = xread(0, cp, room);
  37                         if (sz == 0)
  38                                 break;
  39                         if (sz < 0)
  40                                 die_errno("test-sha1");
  41                         this_sz += sz;
  42                         cp += sz;
  43                         room -= sz;
  44                 }
  45                 if (this_sz == 0)
  46                         break;
  47                 git_SHA1_Update(&ctx, buffer, this_sz);
  48         }
  49         git_SHA1_Final(sha1, &ctx);
  50
  51         if (binary)
  52                 fwrite(sha1, 1, 20, stdout);
  53         else
  54                 puts(sha1_to_hex(sha1));
  55         exit(0);
  56 }