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