Function equalBuffers

test/fixtures/wpt/WebCryptoAPI/util/helpers.js:323–350

(a, b, bitCount)

// in every byte. If bitCount is included, only that leading number of bits
// have to match.
function equalBuffers(a, b, bitCount) {
    var remainder;

    if (typeof bitCount === "undefined" && a.byteLength !== b.byteLength) {
        return false;
    }

    var aBytes = new Uint8Array(a);
    var bBytes = new Uint8Array(b);

    var length = a.byteLength;
    if (typeof bitCount !== "undefined") {
        length = Math.floor(bitCount / 8);
    }

    for (var i=0; i<length; i++) {
        if (aBytes[i] !== bBytes[i]) {
            return false;
        }
    }

    if (typeof bitCount !== "undefined") {
        remainder = bitCount % 8;
        return aBytes[length] >> (8 - remainder) === bBytes[length] >> (8 - remainder);
    }

    return true;
}

// Returns a copy of the sourceBuffer it is sent.
function copyBuffer(sourceBuffer) {