fast-extract/assets/buffer-compare.cjs

Extract contents from various archive types (tar, tar.bz2, tar.gz, tar.xz, tgz, zip)

function compareOffset(source, target, targetStart, sourceStart, targetEnd, sourceEnd) {
	var sourceLength = sourceEnd - sourceStart;
	var targetLength = targetEnd - targetStart;
	var length = Math.min(sourceLength, targetLength);
	var sourceValue;
	var targetValue;

	for (var index = 0; index < length; index++) {
		sourceValue = source[sourceStart + index];
		targetValue = target[targetStart + index];
		if (sourceValue > targetValue) return 1;
		else if (sourceValue < targetValue) return -1;
	}
	return 0;
}

module.exports = function bufferComparePolyfill(source, target, targetStart, targetEnd, sourceStart, sourceEnd) {
	if (arguments.length === 1) return source.compare(target);
	if (targetStart === undefined) targetStart = 0;
	if (targetEnd === undefined) targetEnd = target.length;
	if (sourceStart === undefined) sourceStart = 0;
	if (sourceEnd === undefined) sourceEnd = source.length;
	if (sourceStart >= sourceEnd) return targetStart >= targetEnd ? 0 : -1;
	if (targetStart >= targetEnd) return 1;
	return compareOffset(source, target, targetStart, sourceStart, targetEnd, sourceEnd);
}