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@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
  14 static const char usage[] =
  15         "test-delta (-d|-p) <from_file> <data_file> <out_file>";
  16
  17 int 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 }