1 #include "test-tool.h"
2 #include "cache.h"
3
cmd_hash_impl(int ac,const char ** av,int algo)4 int cmd_hash_impl(int ac, const char **av, int algo)
5 {
6 git_hash_ctx ctx;
7 unsigned char hash[GIT_MAX_HEXSZ];
8 unsigned bufsz = 8192;
9 int binary = 0;
10 char *buffer;
11 const struct git_hash_algo *algop = &hash_algos[algo];
12
13 if (ac == 2) {
14 if (!strcmp(av[1], "-b"))
15 binary = 1;
16 else
17 bufsz = strtoul(av[1], NULL, 10) * 1024 * 1024;
18 }
19
20 if (!bufsz)
21 bufsz = 8192;
22
23 while ((buffer = malloc(bufsz)) == NULL) {
24 fprintf(stderr, "bufsz %u is too big, halving...\n", bufsz);
25 bufsz /= 2;
26 if (bufsz < 1024)
27 die("OOPS");
28 }
29
30 algop->init_fn(&ctx);
31
32 while (1) {
33 ssize_t sz, this_sz;
34 char *cp = buffer;
35 unsigned room = bufsz;
36 this_sz = 0;
37 while (room) {
38 sz = xread(0, cp, room);
39 if (sz == 0)
40 break;
41 if (sz < 0)
42 die_errno("test-hash");
43 this_sz += sz;
44 cp += sz;
45 room -= sz;
46 }
47 if (this_sz == 0)
48 break;
49 algop->update_fn(&ctx, buffer, this_sz);
50 }
51 algop->final_fn(hash, &ctx);
52
53 if (binary)
54 fwrite(hash, 1, algop->rawsz, stdout);
55 else
56 puts(hash_to_hex_algop(hash, algop));
57 return 0;
58 }
59