tools/cws2fws.c

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