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 "test-tool.h"
  12#include "git-compat-util.h"
  13#include "delta.h"
  14#include "cache.h"
  15
  16static const char usage_str[] =
  17        "test-tool delta (-d|-p) <from_file> <data_file> <out_file>";
  18
  19int cmd__delta(int argc, const char **argv)
  20{
  21        int fd;
  22        struct stat st;
  23        void *from_buf, *data_buf, *out_buf;
  24        unsigned long from_size, data_size, out_size;
  25
  26        if (argc != 5 || (strcmp(argv[1], "-d") && strcmp(argv[1], "-p"))) {
  27                fprintf(stderr, "usage: %s\n", usage_str);
  28                return 1;
  29        }
  30
  31        fd = open(argv[2], O_RDONLY);
  32        if (fd < 0 || fstat(fd, &st)) {
  33                perror(argv[2]);
  34                return 1;
  35        }
  36        from_size = st.st_size;
  37        from_buf = mmap(NULL, from_size, PROT_READ, MAP_PRIVATE, fd, 0);
  38        if (from_buf == MAP_FAILED) {
  39                perror(argv[2]);
  40                close(fd);
  41                return 1;
  42        }
  43        close(fd);
  44
  45        fd = open(argv[3], O_RDONLY);
  46        if (fd < 0 || fstat(fd, &st)) {
  47                perror(argv[3]);
  48                return 1;
  49        }
  50        data_size = st.st_size;
  51        data_buf = mmap(NULL, data_size, PROT_READ, MAP_PRIVATE, fd, 0);
  52        if (data_buf == MAP_FAILED) {
  53                perror(argv[3]);
  54                close(fd);
  55                return 1;
  56        }
  57        close(fd);
  58
  59        if (argv[1][1] == 'd')
  60                out_buf = diff_delta(from_buf, from_size,
  61                                     data_buf, data_size,
  62                                     &out_size, 0);
  63        else
  64                out_buf = patch_delta(from_buf, from_size,
  65                                      data_buf, data_size,
  66                                      &out_size);
  67        if (!out_buf) {
  68                fprintf(stderr, "delta operation failed (returned NULL)\n");
  69                return 1;
  70        }
  71
  72        fd = open (argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666);
  73        if (fd < 0 || write_in_full(fd, out_buf, out_size) < 0) {
  74                perror(argv[4]);
  75                return 1;
  76        }
  77
  78        return 0;
  79}