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 #include "cache.h"
  14
  15 static const char usage_str[] =
  16         "test-delta (-d|-p) <from_file> <data_file> <out_file>";
  17
  18 int main(int argc, 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 }