Andrew's git - gitweb.git/blob

   1/*
   2 * test-delta.c: test code to exercise diff-delta.c and patch-delta.c
   3 *
   4 * (C) 2005 Nicolas Pitre <nico@cam.org>
   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
  14static const char usage[] =
  15        "test-delta (-d|-p) <from_file> <data_file> <out_file>";
  16
  17int main(int argc, char *argv[])
  18{
  19        int fd;
  20        struct stat st;
  21        void *from_buf, *data_buf, *out_buf;
  22        unsigned long from_size, data_size, out_size;
  23
  24        if (argc != 5 || (strcmp(argv[1], "-d") && strcmp(argv[1], "-p"))) {
  25                fprintf(stderr, "Usage: %s\n", usage);
  26                return 1;
  27        }
  28
  29        fd = open(argv[2], O_RDONLY);
  30        if (fd < 0 || fstat(fd, &st)) {
  31                perror(argv[2]);
  32                return 1;
  33        }
  34        from_size = st.st_size;
  35        from_buf = mmap(NULL, from_size, PROT_READ, MAP_PRIVATE, fd, 0);
  36        if (from_buf == MAP_FAILED) {
  37                perror(argv[2]);
  38                close(fd);
  39                return 1;
  40        }
  41        close(fd);
  42
  43        fd = open(argv[3], O_RDONLY);
  44        if (fd < 0 || fstat(fd, &st)) {
  45                perror(argv[3]);
  46                return 1;
  47        }
  48        data_size = st.st_size;
  49        data_buf = mmap(NULL, data_size, PROT_READ, MAP_PRIVATE, fd, 0);
  50        if (data_buf == MAP_FAILED) {
  51                perror(argv[3]);
  52                close(fd);
  53                return 1;
  54        }
  55        close(fd);
  56
  57        if (argv[1][1] == 'd')
  58                out_buf = diff_delta(from_buf, from_size,
  59                                     data_buf, data_size,
  60                                     &out_size, 0);
  61        else
  62                out_buf = patch_delta(from_buf, from_size,
  63                                      data_buf, data_size,
  64                                      &out_size);
  65        if (!out_buf) {
  66                fprintf(stderr, "delta operation failed (returned NULL)\n");
  67                return 1;
  68        }
  69
  70        fd = open (argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666);
  71        if (fd < 0 || write(fd, out_buf, out_size) != out_size) {
  72                perror(argv[4]);
  73                return 1;
  74        }
  75
  76        return 0;
  77}