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FFmpeg UDP protocol hacked to be delivered through FNA endpoinds (Simply:Zprasene...
[frescor/ffmpeg.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     {
31         printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]);
32         exit(1);
33     }
34
35     fd_in = open(argv[1], O_RDONLY);
36     if (fd_in < 0)
37     {
38         perror("Error while opening: ");
39         exit(1);
40     }
41
42     fd_out = open(argv[2], O_WRONLY|O_CREAT, 00644);
43     if (fd_out < 0)
44     {
45         perror("Error while opening: ");
46         close(fd_in);
47         exit(1);
48     }
49
50     if (read(fd_in, &buf_in, 8) != 8)
51     {
52         printf("Header error\n");
53         close(fd_in);
54         close(fd_out);
55         exit(1);
56     }
57
58     if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S')
59     {
60         printf("Not a compressed flash file\n");
61         exit(1);
62     }
63
64     fstat(fd_in, &statbuf);
65     comp_len = statbuf.st_size;
66     uncomp_len = buf_in[4] | (buf_in[5] << 8) | (buf_in[6] << 16) | (buf_in[7] << 24);
67
68     printf("Compressed size: %d Uncompressed size: %d\n", comp_len-4, uncomp_len-4);
69
70     // write out modified header
71     buf_in[0] = 'F';
72     write(fd_out, &buf_in, 8);
73
74     zstream.zalloc = NULL;
75     zstream.zfree = NULL;
76     zstream.opaque = NULL;
77     inflateInit(&zstream);
78
79     for (i = 0; i < comp_len-8;)
80     {
81         int ret, len = read(fd_in, &buf_in, 1024);
82
83         dbgprintf("read %d bytes\n", len);
84
85         last_out = zstream.total_out;
86
87         zstream.next_in = &buf_in[0];
88         zstream.avail_in = len;
89         zstream.next_out = &buf_out[0];
90         zstream.avail_out = 65536;
91
92         ret = inflate(&zstream, Z_SYNC_FLUSH);
93         if (ret != Z_STREAM_END && ret != Z_OK)
94         {
95             printf("Error while decompressing: %d\n", ret);
96             inflateEnd(&zstream);
97             exit(1);
98         }
99
100         dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n",
101             zstream.avail_in, zstream.total_in, zstream.avail_out, zstream.total_out,
102             zstream.total_out-last_out);
103
104         write(fd_out, &buf_out, zstream.total_out-last_out);
105
106         i += len;
107
108         if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
109             break;
110     }
111
112     if (zstream.total_out != uncomp_len-8)
113     {
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         write(fd_out, &buf_in, 4);
124     }
125
126     inflateEnd(&zstream);
127     close(fd_in);
128     close(fd_out);
129     return 0;
130 }