tools: K&R reformatting cosmetics
[libav.git] / tools / cws2fws.c
1 /*
2 * cws2fws by Alex Beregszaszi
3 * This file is placed in the public domain.
4 * Use the program however you see fit.
5 *
6 * This utility converts compressed Macromedia Flash files to uncompressed ones.
7 */
8
9 #include <sys/stat.h>
10 #include <fcntl.h>
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <unistd.h>
14 #include <zlib.h>
15
16 #ifdef DEBUG
17 #define dbgprintf printf
18 #else
19 #define dbgprintf(...)
20 #endif
21
22 int main(int argc, char *argv[])
23 {
24 int fd_in, fd_out, comp_len, uncomp_len, i, last_out;
25 char buf_in[1024], buf_out[65536];
26 z_stream zstream;
27 struct stat statbuf;
28
29 if (argc < 3) {
30 printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]);
31 return 1;
32 }
33
34 fd_in = open(argv[1], O_RDONLY);
35 if (fd_in < 0) {
36 perror("Error opening input file");
37 return 1;
38 }
39
40 fd_out = open(argv[2], O_WRONLY | O_CREAT, 00644);
41 if (fd_out < 0) {
42 perror("Error opening output file");
43 close(fd_in);
44 return 1;
45 }
46
47 if (read(fd_in, &buf_in, 8) != 8) {
48 printf("Header error\n");
49 close(fd_in);
50 close(fd_out);
51 return 1;
52 }
53
54 if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S') {
55 printf("Not a compressed flash file\n");
56 return 1;
57 }
58
59 fstat(fd_in, &statbuf);
60 comp_len = statbuf.st_size;
61 uncomp_len = buf_in[4] | (buf_in[5] << 8) | (buf_in[6] << 16) | (buf_in[7] << 24);
62
63 printf("Compressed size: %d Uncompressed size: %d\n",
64 comp_len - 4, uncomp_len - 4);
65
66 // write out modified header
67 buf_in[0] = 'F';
68 if (write(fd_out, &buf_in, 8) < 8) {
69 perror("Error writing output file");
70 return 1;
71 }
72
73 zstream.zalloc = NULL;
74 zstream.zfree = NULL;
75 zstream.opaque = NULL;
76 inflateInit(&zstream);
77
78 for (i = 0; i < comp_len - 8;) {
79 int ret, len = read(fd_in, &buf_in, 1024);
80
81 dbgprintf("read %d bytes\n", len);
82
83 last_out = zstream.total_out;
84
85 zstream.next_in = &buf_in[0];
86 zstream.avail_in = len;
87 zstream.next_out = &buf_out[0];
88 zstream.avail_out = 65536;
89
90 ret = inflate(&zstream, Z_SYNC_FLUSH);
91 if (ret != Z_STREAM_END && ret != Z_OK) {
92 printf("Error while decompressing: %d\n", ret);
93 inflateEnd(&zstream);
94 return 1;
95 }
96
97 dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n",
98 zstream.avail_in, zstream.total_in, zstream.avail_out,
99 zstream.total_out, zstream.total_out - last_out);
100
101 if (write(fd_out, &buf_out, zstream.total_out - last_out) <
102 zstream.total_out - last_out) {
103 perror("Error writing output file");
104 return 1;
105 }
106
107 i += len;
108
109 if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
110 break;
111 }
112
113 if (zstream.total_out != uncomp_len - 8) {
114 printf("Size mismatch (%lu != %d), updating header...\n",
115 zstream.total_out, uncomp_len - 8);
116
117 buf_in[0] = (zstream.total_out + 8) & 0xff;
118 buf_in[1] = ((zstream.total_out + 8) >> 8) & 0xff;
119 buf_in[2] = ((zstream.total_out + 8) >> 16) & 0xff;
120 buf_in[3] = ((zstream.total_out + 8) >> 24) & 0xff;
121
122 lseek(fd_out, 4, SEEK_SET);
123 if (write(fd_out, &buf_in, 4) < 4) {
124 perror("Error writing output file");
125 return 1;
126 }
127 }
128
129 inflateEnd(&zstream);
130 close(fd_in);
131 close(fd_out);
132 return 0;
133 }