number to int64 buffer

toInt64buffer.js

function toInt64buffer(n) {
    var hi = (n / 0x100000000) | 0;
    var lo = n % 0x100000000;
    var buff = new ArrayBuffer(8);
    var view = new Uint8Array(buff);
    for (var i = 7; i >= 0; i--) {
        view[i] = lo & 0xff;
        lo = i == 4 ? hi : lo >>> 8;
    }

    return buff;
}