int OpenZIP( FILE* zip_file ) {
	int length;
	byte* buffer;
	// grab file length.
	fseek( zip_file, 0, SEEK_END );
	length = ftell( zip_file );
	// set allocate size of buffer
	buffer = new byte[ length + 1 ];
	// go back to the beginning.
	fseek( zip_file, SEEK_SET, 0 );
	// copy contents into buffer
	fread( buffer, 1, length, zip_file );

	if ( buffer[0] == 0x50 && buffer[1] == 0x4B && buffer[2] == 0x03 && buffer[3] == 0x04 ) {
		// Working with a zip
		printf( "length: %ibytes\n", length );
	}

	// delete buffer from memory.
	delete buffer;
	return 1; // success
}