Andrew's git - gitweb.git/blob - t/helper/test-sha1.c

   1#include "cache.h"
   2
   3int 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}