echogarden/dist/utilities/Hashing.js

An easy-to-use speech toolset. Includes tools for synthesis, recognition, alignment, speech translation, language detection, source separation and more.

export function murmurHash3(bytes, seed = 0) {
    // https://github.com/bryc/code/blob/master/jshash/hashes/murmurhash3.js
    const p1 = 3432918353;
    const p2 = 461845907;
    const p3 = 2246822507;
    const p4 = 3266489909;
    const byteCount = bytes.length;
    const intIterationMaxIndex = byteCount & -4;
    let k = 0;
    let hash = seed | 0;
    let i = 0;
    for (; i < intIterationMaxIndex; i += 4) {
        k = bytes[i + 3] << 24 | bytes[i + 2] << 16 | bytes[i + 1] << 8 | bytes[i];
        k = Math.imul(k, p1);
        k = k << 15 | k >>> 17;
        hash ^= Math.imul(k, p2);
        hash = hash << 13 | hash >>> 19;
        hash = (Math.imul(hash, 5) + 3864292196) | 0; // |0 = prevent float
    }
    k = 0;
    switch (bytes.length & 3) {
        case 3: {
            k ^= bytes[i + 2] << 16;
        }
        case 2: {
            k ^= bytes[i + 1] << 8;
        }
        case 1: {
            k ^= bytes[i];
            k = Math.imul(k, p1);
            k = k << 15 | k >>> 17;
            hash ^= Math.imul(k, p2);
        }
    }
    hash ^= byteCount;
    hash ^= hash >>> 16;
    hash = Math.imul(hash, p3);
    hash ^= hash >>> 13;
    hash = Math.imul(hash, p4);
    hash ^= hash >>> 16;
    return hash >>> 0;
}
export function convertToSingleInt32Hash(hash) {
    const bytes = new Uint8Array(4);
    const ints = new Int32Array(bytes.buffer);
    return (int32Val) => {
        ints[0] = int32Val;
        return hash(bytes);
    };
}
export const murmurHash3_int32Input = convertToSingleInt32Hash(murmurHash3);
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