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