• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

tools/cws2fws.c

Go to the documentation of this file.
00001 /*
00002  * cws2fws by Alex Beregszaszi
00003  * This file is placed in the public domain.
00004  * Use the program however you see fit.
00005  *
00006  * This utility converts compressed Macromedia Flash files to uncompressed ones.
00007  */
00008 
00009 #include <sys/stat.h>
00010 #include <fcntl.h>
00011 #include <stdio.h>
00012 #include <stdlib.h>
00013 #include <unistd.h>
00014 #include <zlib.h>
00015 
00016 #ifdef DEBUG
00017 #define dbgprintf printf
00018 #else
00019 #define dbgprintf(...)
00020 #endif
00021 
00022 int main(int argc, char *argv[])
00023 {
00024     int fd_in, fd_out, comp_len, uncomp_len, i, last_out;
00025     char buf_in[1024], buf_out[65536];
00026     z_stream zstream;
00027     struct stat statbuf;
00028 
00029     if (argc < 3)
00030     {
00031         printf("Usage: %s <infile.swf> <outfile.swf>\n", argv[0]);
00032         exit(1);
00033     }
00034 
00035     fd_in = open(argv[1], O_RDONLY);
00036     if (fd_in < 0)
00037     {
00038         perror("Error while opening: ");
00039         exit(1);
00040     }
00041 
00042     fd_out = open(argv[2], O_WRONLY|O_CREAT, 00644);
00043     if (fd_out < 0)
00044     {
00045         perror("Error while opening: ");
00046         close(fd_in);
00047         exit(1);
00048     }
00049 
00050     if (read(fd_in, &buf_in, 8) != 8)
00051     {
00052         printf("Header error\n");
00053         close(fd_in);
00054         close(fd_out);
00055         exit(1);
00056     }
00057 
00058     if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S')
00059     {
00060         printf("Not a compressed flash file\n");
00061         exit(1);
00062     }
00063 
00064     fstat(fd_in, &statbuf);
00065     comp_len = statbuf.st_size;
00066     uncomp_len = buf_in[4] | (buf_in[5] << 8) | (buf_in[6] << 16) | (buf_in[7] << 24);
00067 
00068     printf("Compressed size: %d Uncompressed size: %d\n", comp_len-4, uncomp_len-4);
00069 
00070     // write out modified header
00071     buf_in[0] = 'F';
00072     write(fd_out, &buf_in, 8);
00073 
00074     zstream.zalloc = NULL;
00075     zstream.zfree = NULL;
00076     zstream.opaque = NULL;
00077     inflateInit(&zstream);
00078 
00079     for (i = 0; i < comp_len-8;)
00080     {
00081         int ret, len = read(fd_in, &buf_in, 1024);
00082 
00083         dbgprintf("read %d bytes\n", len);
00084 
00085         last_out = zstream.total_out;
00086 
00087         zstream.next_in = &buf_in[0];
00088         zstream.avail_in = len;
00089         zstream.next_out = &buf_out[0];
00090         zstream.avail_out = 65536;
00091 
00092         ret = inflate(&zstream, Z_SYNC_FLUSH);
00093         if (ret != Z_STREAM_END && ret != Z_OK)
00094         {
00095             printf("Error while decompressing: %d\n", ret);
00096             inflateEnd(&zstream);
00097             exit(1);
00098         }
00099 
00100         dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n",
00101             zstream.avail_in, zstream.total_in, zstream.avail_out, zstream.total_out,
00102             zstream.total_out-last_out);
00103 
00104         write(fd_out, &buf_out, zstream.total_out-last_out);
00105 
00106         i += len;
00107 
00108         if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)
00109             break;
00110     }
00111 
00112     if (zstream.total_out != uncomp_len-8)
00113     {
00114         printf("Size mismatch (%lu != %d), updating header...\n",
00115             zstream.total_out, uncomp_len-8);
00116 
00117         buf_in[0] = (zstream.total_out+8) & 0xff;
00118         buf_in[1] = ((zstream.total_out+8) >> 8) & 0xff;
00119         buf_in[2] = ((zstream.total_out+8) >> 16) & 0xff;
00120         buf_in[3] = ((zstream.total_out+8) >> 24) & 0xff;
00121 
00122         lseek(fd_out, 4, SEEK_SET);
00123         write(fd_out, &buf_in, 4);
00124     }
00125 
00126     inflateEnd(&zstream);
00127     close(fd_in);
00128     close(fd_out);
00129     return 0;
00130 }

Generated on Fri Sep 16 2011 17:17:52 for FFmpeg by  doxygen 1.7.1