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 <stdio.h>
  12 #include <unistd.h>
  13 #include <string.h>
  14 #include <fcntl.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <sys/mman.h>
  18 #include "delta.h"
  19
  20 static const char *usage =
  21         "test-delta (-d|-p) <from_file> <data_file> <out_file>";
  22
  23 int main(int argc, char *argv[])
  24 {
  25         int fd;
  26         struct stat st;
  27         void *from_buf, *data_buf, *out_buf;
  28         unsigned long from_size, data_size, out_size;
  29
  30         if (argc != 5 || (strcmp(argv[1], "-d") && strcmp(argv[1], "-p"))) {
  31                 fprintf(stderr, "Usage: %s\n", usage);
  32                 return 1;
  33         }
  34
  35         fd = open(argv[2], O_RDONLY);
  36         if (fd < 0 || fstat(fd, &st)) {
  37                 perror(argv[2]);
  38                 return 1;
  39         }
  40         from_size = st.st_size;
  41         from_buf = mmap(NULL, from_size, PROT_READ, MAP_PRIVATE, fd, 0);
  42         if (from_buf == MAP_FAILED) {
  43                 perror(argv[2]);
  44                 return 1;
  45         }
  46         close(fd);
  47
  48         fd = open(argv[3], O_RDONLY);
  49         if (fd < 0 || fstat(fd, &st)) {
  50                 perror(argv[3]);
  51                 return 1;
  52         }
  53         data_size = st.st_size;
  54         data_buf = mmap(NULL, data_size, PROT_READ, MAP_PRIVATE, fd, 0);
  55         if (data_buf == MAP_FAILED) {
  56                 perror(argv[3]);
  57                 return 1;
  58         }
  59         close(fd);
  60
  61         if (argv[1][1] == 'd')
  62                 out_buf = diff_delta(from_buf, from_size,
  63                                      data_buf, data_size,
  64                                      &out_size, ~0UL);
  65         else
  66                 out_buf = patch_delta(from_buf, from_size,
  67                                       data_buf, data_size,
  68                                       &out_size);
  69         if (!out_buf) {
  70                 fprintf(stderr, "delta operation failed (returned NULL)\n");
  71                 return 1;
  72         }
  73
  74         fd = open (argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666);
  75         if (fd < 0 || write(fd, out_buf, out_size) != out_size) {
  76                 perror(argv[4]);
  77                 return 1;
  78         }
  79
  80         return 0;
  81 }