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/*
* cws2fws by Alex Beregszaszi
* This file is placed in the public domain.
* Use the program however you see fit.
*
* This utility converts compressed Macromedia Flash files to uncompressed ones.
*/
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <zlib.h>
#ifdef DEBUG
#define dbgprintf printf
#else
#define dbgprintf(...)
#endif
int main(int argc, char *argv[])
{
int fd_in, fd_out, comp_len, uncomp_len, i, last_out;
char buf_in[1024], buf_out[65536];
z_stream zstream;
struct stat statbuf;
if (argc < 3)
{
printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]);
exit(1);
}
fd_in = open(argv[1], O_RDONLY);
if (fd_in < 0)
{
perror("Error opening input file");
exit(1);
}
fd_out = open(argv[2], O_WRONLY|O_CREAT, 00644);
if (fd_out < 0)
{
perror("Error opening output file");
close(fd_in);
exit(1);
}
if (read(fd_in, &buf_in, 8) != 8)
{
printf("Header error\n");
close(fd_in);
close(fd_out);
exit(1);
}
if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S')
{
printf("Not a compressed flash file\n");
exit(1);
}
fstat(fd_in, &statbuf);
comp_len = statbuf.st_size;
uncomp_len = buf_in[4] | (buf_in[5] << 8) | (buf_in[6] << 16) | (buf_in[7] << 24);
printf("Compressed size: %d Uncompressed size: %d\n", comp_len-4, uncomp_len-4);
// write out modified header
buf_in[0] = 'F';
if (write(fd_out, &buf_in, 8) < 8) {
perror("Error writing output file");
exit(1);
}
zstream.zalloc = NULL;
zstream.zfree = NULL;
zstream.opaque = NULL;
inflateInit(&zstream);
for (i = 0; i < comp_len-8;)
{
int ret, len = read(fd_in, &buf_in, 1024);
dbgprintf("read %d bytes\n", len);
last_out = zstream.total_out;
zstream.next_in = &buf_in[0];
zstream.avail_in = len;
zstream.next_out = &buf_out[0];
zstream.avail_out = 65536;
ret = inflate(&zstream, Z_SYNC_FLUSH);
if (ret != Z_STREAM_END && ret != Z_OK)
{
printf("Error while decompressing: %d\n", ret);
inflateEnd(&zstream);
exit(1);
}
dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n",
zstream.avail_in, zstream.total_in, zstream.avail_out, zstream.total_out,
zstream.total_out-last_out);
if (write(fd_out, &buf_out, zstream.total_out - last_out) < zstream.total_out - last_out) {
perror("Error writing output file");
exit(1);
}
i += len;
if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
break;
}
if (zstream.total_out != uncomp_len-8)
{
printf("Size mismatch (%lu != %d), updating header...\n",
zstream.total_out, uncomp_len-8);
buf_in[0] = (zstream.total_out+8) & 0xff;
buf_in[1] = ((zstream.total_out+8) >> 8) & 0xff;
buf_in[2] = ((zstream.total_out+8) >> 16) & 0xff;
buf_in[3] = ((zstream.total_out+8) >> 24) & 0xff;
lseek(fd_out, 4, SEEK_SET);
if (write(fd_out, &buf_in, 4) < 4) {
perror("Error writing output file");
exit(1);
}
}
inflateEnd(&zstream);
close(fd_in);
close(fd_out);
return 0;
}
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