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