start-sdk/lib/esm/deps/deno.land/std@0.140.0/bytes/equals.js

// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
/** Check whether binary arrays are equal to each other using 8-bit comparisons.
 * @private
 * @param a first array to check equality
 * @param b second array to check equality
 */
export function equalsNaive(a, b) {
    if (a.length !== b.length)
        return false;
    for (let i = 0; i < b.length; i++) {
        if (a[i] !== b[i])
            return false;
    }
    return true;
}
/** Check whether binary arrays are equal to each other using 32-bit comparisons.
 * @private
 * @param a first array to check equality
 * @param b second array to check equality
 */
export function equalsSimd(a, b) {
    if (a.length !== b.length)
        return false;
    const len = a.length;
    const compressable = Math.floor(len / 4);
    const compressedA = new Uint32Array(a.buffer, 0, compressable);
    const compressedB = new Uint32Array(b.buffer, 0, compressable);
    for (let i = compressable * 4; i < len; i++) {
        if (a[i] !== b[i])
            return false;
    }
    for (let i = 0; i < compressedA.length; i++) {
        if (compressedA[i] !== compressedB[i])
            return false;
    }
    return true;
}
/** Check whether binary arrays are equal to each other.
 * @param a first array to check equality
 * @param b second array to check equality
 */
export function equals(a, b) {
    if (a.length < 1000)
        return equalsNaive(a, b);
    return equalsSimd(a, b);
}