test-sha1.c

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