root/test-sha1.c

DEFINITIONS

1. main

#include "cache.h"

int main(int ac, char **av)
{
        git_SHA_CTX ctx;
        unsigned char sha1[20];
        unsigned bufsz = 8192;
        int binary = 0;
        char *buffer;

        if (ac == 2) {
                if (!strcmp(av[1], "-b"))
                        binary = 1;
                else
                        bufsz = strtoul(av[1], NULL, 10) * 1024 * 1024;
        }

        if (!bufsz)
                bufsz = 8192;

        while ((buffer = malloc(bufsz)) == NULL) {
                fprintf(stderr, "bufsz %u is too big, halving...\n", bufsz);
                bufsz /= 2;
                if (bufsz < 1024)
                        die("OOPS");
        }

        git_SHA1_Init(&ctx);

        while (1) {
                ssize_t sz, this_sz;
                char *cp = buffer;
                unsigned room = bufsz;
                this_sz = 0;
                while (room) {
                        sz = xread(0, cp, room);
                        if (sz == 0)
                                break;
                        if (sz < 0)
                                die_errno("test-sha1");
                        this_sz += sz;
                        cp += sz;
                        room -= sz;
                }
                if (this_sz == 0)
                        break;
                git_SHA1_Update(&ctx, buffer, this_sz);
        }
        git_SHA1_Final(sha1, &ctx);

        if (binary)
                fwrite(sha1, 1, 20, stdout);
        else
                puts(sha1_to_hex(sha1));
        exit(0);
}