apply: handle "traditional" creation/deletion diff correctly.
[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                 close(fd);
45                 return 1;
46         }
47         close(fd);
48
49         fd = open(argv[3], O_RDONLY);
50         if (fd < 0 || fstat(fd, &st)) {
51                 perror(argv[3]);
52                 return 1;
53         }
54         data_size = st.st_size;
55         data_buf = mmap(NULL, data_size, PROT_READ, MAP_PRIVATE, fd, 0);
56         if (data_buf == MAP_FAILED) {
57                 perror(argv[3]);
58                 close(fd);
59                 return 1;
60         }
61         close(fd);
62
63         if (argv[1][1] == 'd')
64                 out_buf = diff_delta(from_buf, from_size,
65                                      data_buf, data_size,
66                                      &out_size, 0);
67         else
68                 out_buf = patch_delta(from_buf, from_size,
69                                       data_buf, data_size,
70                                       &out_size);
71         if (!out_buf) {
72                 fprintf(stderr, "delta operation failed (returned NULL)\n");
73                 return 1;
74         }
75
76         fd = open (argv[4], O_WRONLY|O_CREAT|O_TRUNC, 0666);
77         if (fd < 0 || write(fd, out_buf, out_size) != out_size) {
78                 perror(argv[4]);
79                 return 1;
80         }
81
82         return 0;
83 }