mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
128 lines
3.0 KiB
C
128 lines
3.0 KiB
C
/*
|
|
* cws2fws by Alex Beregszaszi
|
|
* Public domain.
|
|
*
|
|
* This utility converts compressed Macromedia Flash files to uncompressed ones.
|
|
*
|
|
*/
|
|
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <zlib.h>
|
|
|
|
#ifdef DEBUG
|
|
#define dbgprintf printf
|
|
#else
|
|
#define dbgprintf
|
|
#endif
|
|
|
|
main(int argc, char *argv[])
|
|
{
|
|
int fd_in, fd_out, comp_len, uncomp_len, tag, 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 while opening: ");
|
|
exit(1);
|
|
}
|
|
|
|
fd_out = open(argv[2], O_WRONLY|O_CREAT, 00644);
|
|
if (fd_out < 0)
|
|
{
|
|
perror("Error while opening: ");
|
|
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';
|
|
write(fd_out, &buf_in, 8);
|
|
|
|
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: %d a_out: %d t_out: %d -- %d out\n",
|
|
zstream.avail_in, zstream.total_in, zstream.avail_out, zstream.total_out,
|
|
zstream.total_out-last_out);
|
|
|
|
write(fd_out, &buf_out, zstream.total_out-last_out);
|
|
|
|
i += len;
|
|
|
|
if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
|
|
break;
|
|
}
|
|
|
|
if (zstream.total_out != uncomp_len-8)
|
|
{
|
|
printf("Size mismatch (%d != %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);
|
|
write(fd_out, &buf_in, 4);
|
|
}
|
|
|
|
inflateEnd(&zstream);
|
|
close(fd_in);
|
|
close(fd_out);
|
|
}
|