int main(int argc, char *argv[])

{

    int fd_in, fd_out, comp_len, uncomp_len, 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]);

        return 1;

    }



    fd_in = open(argv[1], O_RDONLY);

    if (fd_in < 0) {

        perror("Error opening input file");

        return 1;

    }



    fd_out = open(argv[2], O_WRONLY | O_CREAT, 00644);

    if (fd_out < 0) {

        perror("Error opening output file");

        close(fd_in);

        return 1;

    }



    if (read(fd_in, &buf_in, 8) != 8) {

        printf("Header error\n");

        close(fd_in);

        close(fd_out);

        return 1;

    }



    if (buf_in[0] != 'C' || buf_in[1] != 'W' || buf_in[2] != 'S') {

        printf("Not a compressed flash file\n");

        return 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';

    if (write(fd_out, &buf_in, 8) < 8) {

        perror("Error writing output file");

        return 1;

    }



    zstream.zalloc = NULL;

    zstream.zfree  = NULL;

    zstream.opaque = NULL;

    if (inflateInit(&zstream) != Z_OK) {

        fprintf(stderr, "inflateInit failed\n");

        return 1;

    }



    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);

            return 1;

        }



        dbgprintf("a_in: %d t_in: %lu a_out: %d t_out: %lu -- %lu out\n",

                  zstream.avail_in, zstream.total_in, zstream.avail_out,

                  zstream.total_out, zstream.total_out - last_out);



        if (write(fd_out, &buf_out, zstream.total_out - last_out) <

            zstream.total_out - last_out) {

            perror("Error writing output file");

            return 1;

        }



        i += len;



        if (ret == Z_STREAM_END || ret == Z_BUF_ERROR)

            break;

    }



    if (zstream.total_out != uncomp_len - 8) {

        printf("Size mismatch (%lu != %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;



        if (   lseek(fd_out, 4, SEEK_SET) < 0

            || write(fd_out, &buf_in, 4) < 4) {

            perror("Error writing output file");

            return 1;

        }

    }



    inflateEnd(&zstream);

    close(fd_in);

    close(fd_out);

    return 0;

}
