Make public domain. Hope Diego dont mind it, he had two cosmetics commits :)
[libav.git] / cws2fws.c
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1/*
2 * cws2fws by Alex Beregszaszi <alex@fsn.hu>
3d0c32d4 3 * Public domain.
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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
20main(int argc, char *argv[])
21{
22 int fd_in, fd_out, comp_len, uncomp_len, tag, i, last_out;
0c2ed2df 23 char buf_in[1024], buf_out[65536];
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24 z_stream zstream;
25 struct stat statbuf;
26
27 if (argc < 3)
28 {
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29 printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]);
30 exit(1);
f7599d5f 31 }
115329f1 32
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33 fd_in = open(argv[1], O_RDONLY);
34 if (fd_in < 0)
35 {
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36 perror("Error while opening: ");
37 exit(1);
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38 }
39
40 fd_out = open(argv[2], O_WRONLY|O_CREAT, 00644);
41 if (fd_out < 0)
42 {
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43 perror("Error while opening: ");
44 close(fd_in);
45 exit(1);
f7599d5f 46 }
115329f1 47
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48 if (read(fd_in, &buf_in, 8) != 8)
49 {
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50 printf("Header error\n");
51 close(fd_in);
52 close(fd_out);
53 exit(1);
f7599d5f 54 }
115329f1 55
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56 if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S')
57 {
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58 printf("Not a compressed flash file\n");
59 exit(1);
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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);
115329f1 65
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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);
115329f1 76
0c2ed2df 77 for (i = 0; i < comp_len-8;)
f7599d5f 78 {
bb270c08 79 int ret, len = read(fd_in, &buf_in, 1024);
f7599d5f 80
bb270c08 81 dbgprintf("read %d bytes\n", len);
115329f1 82
bb270c08 83 last_out = zstream.total_out;
115329f1 84
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85 zstream.next_in = &buf_in[0];
86 zstream.avail_in = len;
87 zstream.next_out = &buf_out[0];
0c2ed2df 88 zstream.avail_out = 65536;
115329f1 89
bb270c08 90 ret = inflate(&zstream, Z_SYNC_FLUSH);
0c2ed2df 91 if (ret != Z_STREAM_END && ret != Z_OK)
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92 {
93 printf("Error while decompressing: %d\n", ret);
94 inflateEnd(&zstream);
95 exit(1);
96 }
115329f1 97
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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);
115329f1 101
bb270c08 102 write(fd_out, &buf_out, zstream.total_out-last_out);
f7599d5f 103
bb270c08 104 i += len;
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105
106 if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
107 break;
f7599d5f 108 }
115329f1 109
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110 if (zstream.total_out != uncomp_len-8)
111 {
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112 printf("Size mismatch (%d != %d), updating header...\n",
113 zstream.total_out, uncomp_len-8);
f7599d5f 114
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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;
115329f1 119
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120 lseek(fd_out, 4, SEEK_SET);
121 write(fd_out, &buf_in, 4);
f7599d5f 122 }
115329f1 123
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124 inflateEnd(&zstream);
125 close(fd_in);
126 close(fd_out);
127}