yading@11: /*
yading@11:  * cws2fws by Alex Beregszaszi
yading@11:  * This file is placed in the public domain.
yading@11:  * Use the program however you see fit.
yading@11:  *
yading@11:  * This utility converts compressed Macromedia Flash files to uncompressed ones.
yading@11:  */
yading@11: 
yading@11: #include "config.h"
yading@11: #include <sys/stat.h>
yading@11: #include <fcntl.h>
yading@11: #include <stdio.h>
yading@11: #include <stdlib.h>
yading@11: #if HAVE_UNISTD_H
yading@11: #include <unistd.h>
yading@11: #endif
yading@11: #if HAVE_IO_H
yading@11: #include <io.h>
yading@11: #endif
yading@11: #include <zlib.h>
yading@11: 
yading@11: #ifdef DEBUG
yading@11: #define dbgprintf printf
yading@11: #else
yading@11: #define dbgprintf(...)
yading@11: #endif
yading@11: 
yading@11: int main(int argc, char *argv[])
yading@11: {
yading@11:     int fd_in, fd_out, comp_len, uncomp_len, i, last_out;
yading@11:     char buf_in[1024], buf_out[65536];
yading@11:     z_stream zstream;
yading@11:     struct stat statbuf;
yading@11: 
yading@11:     if (argc < 3) {
yading@11:         printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]);
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     fd_in = open(argv[1], O_RDONLY);
yading@11:     if (fd_in < 0) {
yading@11:         perror("Error opening input file");
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     fd_out = open(argv[2], O_WRONLY | O_CREAT, 00644);
yading@11:     if (fd_out < 0) {
yading@11:         perror("Error opening output file");
yading@11:         close(fd_in);
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     if (read(fd_in, &buf_in, 8) != 8) {
yading@11:         printf("Header error\n");
yading@11:         close(fd_in);
yading@11:         close(fd_out);
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S') {
yading@11:         printf("Not a compressed flash file\n");
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     if (fstat(fd_in, &statbuf) < 0) {
yading@11:         perror("fstat failed");
yading@11:         return 1;
yading@11:     }
yading@11:     comp_len   = statbuf.st_size;
yading@11:     uncomp_len = buf_in[4] | (buf_in[5] << 8) | (buf_in[6] << 16) | (buf_in[7] << 24);
yading@11: 
yading@11:     printf("Compressed size: %d Uncompressed size: %d\n",
yading@11:            comp_len - 4, uncomp_len - 4);
yading@11: 
yading@11:     // write out modified header
yading@11:     buf_in[0] = 'F';
yading@11:     if (write(fd_out, &buf_in, 8) < 8) {
yading@11:         perror("Error writing output file");
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     zstream.zalloc = NULL;
yading@11:     zstream.zfree  = NULL;
yading@11:     zstream.opaque = NULL;
yading@11:     if (inflateInit(&zstream) != Z_OK) {
yading@11:         fprintf(stderr, "inflateInit failed\n");
yading@11:         return 1;
yading@11:     }
yading@11: 
yading@11:     for (i = 0; i < comp_len - 8;) {
yading@11:         int ret, len = read(fd_in, &buf_in, 1024);
yading@11: 
yading@11:         dbgprintf("read %d bytes\n", len);
yading@11: 
yading@11:         last_out = zstream.total_out;
yading@11: 
yading@11:         zstream.next_in   = &buf_in[0];
yading@11:         zstream.avail_in  = len;
yading@11:         zstream.next_out  = &buf_out[0];
yading@11:         zstream.avail_out = 65536;
yading@11: 
yading@11:         ret = inflate(&zstream, Z_SYNC_FLUSH);
yading@11:         if (ret != Z_STREAM_END && ret != Z_OK) {
yading@11:             printf("Error while decompressing: %d\n", ret);
yading@11:             inflateEnd(&zstream);
yading@11:             return 1;
yading@11:         }
yading@11: 
yading@11:         dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n",
yading@11:                   zstream.avail_in, zstream.total_in, zstream.avail_out,
yading@11:                   zstream.total_out, zstream.total_out - last_out);
yading@11: 
yading@11:         if (write(fd_out, &buf_out, zstream.total_out - last_out) <
yading@11:             zstream.total_out - last_out) {
yading@11:             perror("Error writing output file");
yading@11:             return 1;
yading@11:         }
yading@11: 
yading@11:         i += len;
yading@11: 
yading@11:         if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
yading@11:             break;
yading@11:     }
yading@11: 
yading@11:     if (zstream.total_out != uncomp_len - 8) {
yading@11:         printf("Size mismatch (%lu != %d), updating header...\n",
yading@11:                zstream.total_out, uncomp_len - 8);
yading@11: 
yading@11:         buf_in[0] =  (zstream.total_out + 8)        & 0xff;
yading@11:         buf_in[1] = ((zstream.total_out + 8) >>  8) & 0xff;
yading@11:         buf_in[2] = ((zstream.total_out + 8) >> 16) & 0xff;
yading@11:         buf_in[3] = ((zstream.total_out + 8) >> 24) & 0xff;
yading@11: 
yading@11:         if (   lseek(fd_out, 4, SEEK_SET) < 0
yading@11:             || write(fd_out, &buf_in, 4) < 4) {
yading@11:             perror("Error writing output file");
yading@11:             return 1;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     inflateEnd(&zstream);
yading@11:     close(fd_in);
yading@11:     close(fd_out);
yading@11:     return 0;
yading@11: }