postgrejs/cjs/util/bigint-methods.js

Professional PostgreSQL client NodeJS

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.readBigInt64BE = readBigInt64BE;
exports.writeBigUInt64BE = writeBigUInt64BE;
const big0 = BigInt(0);
const beAnd = BigInt('0xffffffff');
const big32 = BigInt(32);
// https://github.com/nodejs/node/blob/v13.9.0/lib/internal/buffer.js
function readBigInt64BE(buf, offset = 0) {
    const first = buf[offset];
    const last = buf[offset + 7];
    if (first === undefined || last === undefined)
        return big0;
    const val = (first << 24) + // Overflow
        buf[++offset] * 2 ** 16 +
        buf[++offset] * 2 ** 8 +
        buf[++offset];
    return ((BigInt(val) << big32) +
        BigInt(buf[++offset] * 2 ** 24 +
            buf[++offset] * 2 ** 16 +
            buf[++offset] * 2 ** 8 +
            last));
}
function writeBigUInt64BE(buf, value, offset = 0) {
    // @ts-ignore
    let lo = Number(value & beAnd);
    buf[offset + 7] = lo;
    lo = lo >> 8;
    buf[offset + 6] = lo;
    lo = lo >> 8;
    buf[offset + 5] = lo;
    lo = lo >> 8;
    buf[offset + 4] = lo;
    // @ts-ignore
    let hi = Number((value >> big32) & beAnd);
    buf[offset + 3] = hi;
    hi = hi >> 8;
    buf[offset + 2] = hi;
    hi = hi >> 8;
    buf[offset + 1] = hi;
    hi = hi >> 8;
    buf[offset] = hi;
    return offset + 8;
}