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
main(int argc,char * argv[])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 if (len == -1) {
93 printf("read failure\n");
94 inflateEnd(&zstream);
95 goto out;
96 }
97
98 dbgprintf("read %d bytes\n", len);
99
100 last_out = zstream.total_out;
101
102 zstream.next_in = &buf_in[0];
103 zstream.avail_in = len;
104 zstream.next_out = &buf_out[0];
105 zstream.avail_out = 65536;
106
107 ret = inflate(&zstream, Z_SYNC_FLUSH);
108 if (ret != Z_STREAM_END && ret != Z_OK) {
109 printf("Error while decompressing: %d\n", ret);
110 inflateEnd(&zstream);
111 goto out;
112 }
113
114 dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n",
115 zstream.avail_in, zstream.total_in, zstream.avail_out,
116 zstream.total_out, zstream.total_out - last_out);
117
118 if (write(fd_out, &buf_out, zstream.total_out - last_out) <
119 zstream.total_out - last_out) {
120 perror("Error writing output file");
121 inflateEnd(&zstream);
122 goto out;
123 }
124
125 i += len;
126
127 if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
128 break;
129 }
130
131 if (zstream.total_out != uncomp_len - 8) {
132 printf("Size mismatch (%lu != %d), updating header...\n",
133 zstream.total_out, uncomp_len - 8);
134
135 buf_in[0] = (zstream.total_out + 8) & 0xff;
136 buf_in[1] = ((zstream.total_out + 8) >> 8) & 0xff;
137 buf_in[2] = ((zstream.total_out + 8) >> 16) & 0xff;
138 buf_in[3] = ((zstream.total_out + 8) >> 24) & 0xff;
139
140 if ( lseek(fd_out, 4, SEEK_SET) < 0
141 || write(fd_out, &buf_in, 4) < 4) {
142 perror("Error writing output file");
143 inflateEnd(&zstream);
144 goto out;
145 }
146 }
147
148 ret = 0;
149 inflateEnd(&zstream);
150 out:
151 close(fd_in);
152 close(fd_out);
153 return ret;
154 }
155