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

   1/*
   2 * test-delta.c: test code to exercise diff-delta.c and patch-delta.c
   3 *
   4 * (C) 2005 Nicolas Pitre <nico@fluxnic.net>
   5 *
   6 * This code is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 */
  10
  11#include "git-compat-util.h"
  12#include "delta.h"
  13#include "cache.h"
  14
  15static const char usage_str[] =
  16        "test-delta (-d|-p) <from_file> <data_file> <out_file>";
  17
  18int cmd_main(int argc, const char **argv)
  19{
  20        int fd;
  21        struct stat st;
  22        void *from_buf, *data_buf, *out_buf;
  23        unsigned long from_size, data_size, out_size;
  24
  25        if (argc != 5 || (strcmp(argv[1], "-d") && strcmp(argv[1], "-p"))) {
  26                fprintf(stderr, "usage: %s\n", usage_str);
  27                return 1;
  28        }
  29
  30        fd = open(argv[2], O_RDONLY);
  31        if (fd < 0 || fstat(fd, &st)) {
  32                perror(argv[2]);
  33                return 1;
  34        }
  35        from_size = st.st_size;
  36        from_buf = mmap(NULL, from_size, PROT_READ, MAP_PRIVATE, fd, 0);
  37        if (from_buf == MAP_FAILED) {
  38                perror(argv[2]);
  39                close(fd);
  40                return 1;
  41        }
  42        close(fd);
  43
  44        fd = open(argv[3], O_RDONLY);
  45        if (fd < 0 || fstat(fd, &st)) {
  46                perror(argv[3]);
  47                return 1;
  48        }
  49        data_size = st.st_size;
  50        data_buf = mmap(NULL, data_size, PROT_READ, MAP_PRIVATE, fd, 0);
  51        if (data_buf == MAP_FAILED) {
  52                perror(argv[3]);
  53                close(fd);
  54                return 1;
  55        }
  56        close(fd);
  57
  58        if (argv[1][1] == 'd')
  59                out_buf = diff_delta(from_buf, from_size,
  60                                     data_buf, data_size,
  61                                     &out_size, 0);
  62        else
  63                out_buf = patch_delta(from_buf, from_size,
  64                                      data_buf, data_size,
  65                                      &out_size);
  66        if (!out_buf) {
  67                fprintf(stderr, "delta operation failed (returned NULL)\n");
  68                return 1;
  69        }
  70
  71        fd = open (argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666);
  72        if (fd < 0 || write_in_full(fd, out_buf, out_size) != out_size) {
  73                perror(argv[4]);
  74                return 1;
  75        }
  76
  77        return 0;
  78}