for(i = 1; i < cfb.FileIndex.length; ++i) {
		file = cfb.FileIndex[i];
		/*:: if(!file.content) throw new Error("unreachable"); */
		if(file.size > 0 && file.size < 0x1000) {
			if (has_buf && Buffer.isBuffer(file.content)) {
				file.content.copy(o, o.l, 0, file.size);
				// o is a 0-filled Buffer so just set next offset
				o.l += (file.size + 63) & -64;
			} else {
				for(j = 0; j < file.size; ++j) o.write_shift(1, file.content[j]);
				for(; j & 0x3F; ++j) o.write_shift(1, 0);
			}
		}
	}
	if (has_buf) {
		o.l = o.length;
	} else {
		// When using Buffer, already 0-filled
		while(o.l < o.length) o.write_shift(1, 0);
	}