path: root/tools/cws2fws.c (plain)
blob: 7046b69957194f894ab82b15bdb50bb2220dc615

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 "config.h"
10	#include <sys/stat.h>
11	#include <fcntl.h>
12	#include <stdio.h>
13	#include <stdlib.h>
14	#if HAVE_UNISTD_H
15	#include <unistd.h>
16	#endif
17	#if HAVE_IO_H
18	#include <io.h>
19	#endif
20	#include <zlib.h>
21
22	#ifdef DEBUG
23	#define dbgprintf printf
24	#else
25	#define dbgprintf(...) do { if (0) printf(__VA_ARGS__); } while (0)
26	#endif
27
28	int main(int argc, char *argv[])
29	{
30	int fd_in, fd_out, comp_len, uncomp_len, i, last_out;
31	char buf_in[1024], buf_out[65536];
32	z_stream zstream;
33	struct stat statbuf;
34	int ret = 1;
35
36	if (argc < 3) {
37	printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]);
38	return 1;
39	}
40
41	fd_in = open(argv[1], O_RDONLY);
42	if (fd_in < 0) {
43	perror("Error opening input file");
44	return 1;
45	}
46
47	fd_out = open(argv[2], O_WRONLY | O_CREAT, 00644);
48	if (fd_out < 0) {
49	perror("Error opening output file");
50	close(fd_in);
51	return 1;
52	}
53
54	if (read(fd_in, &buf_in, 8) != 8) {
55	printf("Header error\n");
56	goto out;
57	}
58
59	if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S') {
60	printf("Not a compressed flash file\n");
61	goto out;
62	}
63
64	if (fstat(fd_in, &statbuf) < 0) {
65	perror("fstat failed");
66	return 1;
67	}
68	comp_len = statbuf.st_size;
69	uncomp_len = buf_in[4] | (buf_in[5] << 8) | (buf_in[6] << 16) | (buf_in[7] << 24);
70
71	printf("Compressed size: %d Uncompressed size: %d\n",
72	comp_len - 4, uncomp_len - 4);
73
74	// write out modified header
75	buf_in[0] = 'F';
76	if (write(fd_out, &buf_in, 8) < 8) {
77	perror("Error writing output file");
78	goto out;
79	}
80
81	zstream.zalloc = NULL;
82	zstream.zfree = NULL;
83	zstream.opaque = NULL;
84	if (inflateInit(&zstream) != Z_OK) {
85	fprintf(stderr, "inflateInit failed\n");
86	return 1;
87	}
88
89	for (i = 0; i < comp_len - 8;) {
90	int ret, len = read(fd_in, &buf_in, 1024);
91
92	dbgprintf("read %d bytes\n", len);
93
94	last_out = zstream.total_out;
95
96	zstream.next_in = &buf_in[0];
97	zstream.avail_in = len;
98	zstream.next_out = &buf_out[0];
99	zstream.avail_out = 65536;
100
101	ret = inflate(&zstream, Z_SYNC_FLUSH);
102	if (ret != Z_STREAM_END && ret != Z_OK) {
103	printf("Error while decompressing: %d\n", ret);
104	inflateEnd(&zstream);
105	goto out;
106	}
107
108	dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n",
109	zstream.avail_in, zstream.total_in, zstream.avail_out,
110	zstream.total_out, zstream.total_out - last_out);
111
112	if (write(fd_out, &buf_out, zstream.total_out - last_out) <
113	zstream.total_out - last_out) {
114	perror("Error writing output file");
115	inflateEnd(&zstream);
116	goto out;
117	}
118
119	i += len;
120
121	if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
122	break;
123	}
124
125	if (zstream.total_out != uncomp_len - 8) {
126	printf("Size mismatch (%lu != %d), updating header...\n",
127	zstream.total_out, uncomp_len - 8);
128
129	buf_in[0] = (zstream.total_out + 8) & 0xff;
130	buf_in[1] = ((zstream.total_out + 8) >> 8) & 0xff;
131	buf_in[2] = ((zstream.total_out + 8) >> 16) & 0xff;
132	buf_in[3] = ((zstream.total_out + 8) >> 24) & 0xff;
133
134	if ( lseek(fd_out, 4, SEEK_SET) < 0
135	|| write(fd_out, &buf_in, 4) < 4) {
136	perror("Error writing output file");
137	inflateEnd(&zstream);
138	goto out;
139	}
140	}
141
142	ret = 0;
143	inflateEnd(&zstream);
144	out:
145	close(fd_in);
146	close(fd_out);
147	return ret;
148	}
149