@gmod/bbi/esm/bigint-polyfill/pure.js

Parser for BigWig/BigBed files

// from https://github.com/yume-chan/ya-webadb/blob/main/libraries/dataview-bigint-polyfill
// license:MIT
// needed for browsers including safari 14
const BigInt32 = BigInt(32);
export function getBigInt64(dataView, byteOffset, littleEndian) {
    const littleEndianMask = Number(!!littleEndian);
    const bigEndianMask = Number(!littleEndian);
    return ((BigInt(dataView.getInt32(byteOffset, littleEndian) * bigEndianMask +
        dataView.getInt32(byteOffset + 4, littleEndian) * littleEndianMask) <<
        BigInt32) |
        BigInt(dataView.getUint32(byteOffset, littleEndian) * littleEndianMask +
            dataView.getUint32(byteOffset + 4, littleEndian) * bigEndianMask));
}
export function getBigUint64(dataView, byteOffset, littleEndian) {
    const a = dataView.getUint32(byteOffset, littleEndian);
    const b = dataView.getUint32(byteOffset + 4, littleEndian);
    const littleEndianMask = Number(!!littleEndian);
    const bigEndianMask = Number(!littleEndian);
    // This branch-less optimization is 77x faster than normal ternary operator.
    // and only 3% slower than native implementation
    // https://jsbench.me/p8kyhg1eqv/1
    return ((BigInt(a * bigEndianMask + b * littleEndianMask) << BigInt32) |
        BigInt(a * littleEndianMask + b * bigEndianMask));
}
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