[PATCH] Deltification library work by Nicolas Pitre.
[git/git.git] / 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, &out_size);
64 else
65 out_buf = patch_delta(from_buf, from_size,
66 data_buf, data_size, &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(fd, out_buf, out_size) != out_size) {
74 perror(argv[4]);
75 return 1;
76 }
77
78 return 0;
79 }