adx: remove useless comments
[libav.git] / tools / cws2fws.c
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f7599d5f 1/*
a7b91ac6 2 * cws2fws by Alex Beregszaszi
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3 * This file is placed in the public domain.
4 * Use the program however you see fit.
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5 *
6 * This utility converts compressed Macromedia Flash files to uncompressed ones.
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7 */
8
9#include <sys/stat.h>
10#include <fcntl.h>
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11#include <stdio.h>
12#include <stdlib.h>
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13#include <unistd.h>
14#include <zlib.h>
15
16#ifdef DEBUG
17#define dbgprintf printf
18#else
1f48345a 19#define dbgprintf(...)
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20#endif
21
226cbe07 22int main(int argc, char *argv[])
f7599d5f 23{
15bf461b 24 int fd_in, fd_out, comp_len, uncomp_len, i, last_out;
0c2ed2df 25 char buf_in[1024], buf_out[65536];
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26 z_stream zstream;
27 struct stat statbuf;
28
29 if (argc < 3)
30 {
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31 printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]);
32 exit(1);
f7599d5f 33 }
115329f1 34
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35 fd_in = open(argv[1], O_RDONLY);
36 if (fd_in < 0)
37 {
c540061f 38 perror("Error opening input file");
bb270c08 39 exit(1);
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40 }
41
42 fd_out = open(argv[2], O_WRONLY|O_CREAT, 00644);
43 if (fd_out < 0)
44 {
c540061f 45 perror("Error opening output file");
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46 close(fd_in);
47 exit(1);
f7599d5f 48 }
115329f1 49
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50 if (read(fd_in, &buf_in, 8) != 8)
51 {
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52 printf("Header error\n");
53 close(fd_in);
54 close(fd_out);
55 exit(1);
f7599d5f 56 }
115329f1 57
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58 if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S')
59 {
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60 printf("Not a compressed flash file\n");
61 exit(1);
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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);
115329f1 67
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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';
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72 if (write(fd_out, &buf_in, 8) < 8) {
73 perror("Error writing output file");
74 exit(1);
75 }
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76
77 zstream.zalloc = NULL;
78 zstream.zfree = NULL;
79 zstream.opaque = NULL;
80 inflateInit(&zstream);
115329f1 81
0c2ed2df 82 for (i = 0; i < comp_len-8;)
f7599d5f 83 {
bb270c08 84 int ret, len = read(fd_in, &buf_in, 1024);
f7599d5f 85
bb270c08 86 dbgprintf("read %d bytes\n", len);
115329f1 87
bb270c08 88 last_out = zstream.total_out;
115329f1 89
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90 zstream.next_in = &buf_in[0];
91 zstream.avail_in = len;
92 zstream.next_out = &buf_out[0];
0c2ed2df 93 zstream.avail_out = 65536;
115329f1 94
bb270c08 95 ret = inflate(&zstream, Z_SYNC_FLUSH);
0c2ed2df 96 if (ret != Z_STREAM_END && ret != Z_OK)
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97 {
98 printf("Error while decompressing: %d\n", ret);
99 inflateEnd(&zstream);
100 exit(1);
101 }
115329f1 102
1f48345a 103 dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n",
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104 zstream.avail_in, zstream.total_in, zstream.avail_out, zstream.total_out,
105 zstream.total_out-last_out);
115329f1 106
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107 if (write(fd_out, &buf_out, zstream.total_out - last_out) < zstream.total_out - last_out) {
108 perror("Error writing output file");
109 exit(1);
110 }
f7599d5f 111
bb270c08 112 i += len;
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113
114 if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
115 break;
f7599d5f 116 }
115329f1 117
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118 if (zstream.total_out != uncomp_len-8)
119 {
1f48345a 120 printf("Size mismatch (%lu != %d), updating header...\n",
bb270c08 121 zstream.total_out, uncomp_len-8);
f7599d5f 122
bb270c08 123 buf_in[0] = (zstream.total_out+8) & 0xff;
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124 buf_in[1] = ((zstream.total_out+8) >> 8) & 0xff;
125 buf_in[2] = ((zstream.total_out+8) >> 16) & 0xff;
126 buf_in[3] = ((zstream.total_out+8) >> 24) & 0xff;
115329f1 127
bb270c08 128 lseek(fd_out, 4, SEEK_SET);
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129 if (write(fd_out, &buf_in, 4) < 4) {
130 perror("Error writing output file");
131 exit(1);
132 }
f7599d5f 133 }
115329f1 134
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135 inflateEnd(&zstream);
136 close(fd_in);
137 close(fd_out);
226cbe07 138 return 0;
f7599d5f 139}