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; }