source: node_modules/pg-int8/index.js@ 6c7cfa6

'use strict';

// selected so (BASE - 1) * 0x100000000 + 0xffffffff is a safe integer
var BASE = 1000000;

function readInt8(buffer) {
        var high = buffer.readInt32BE(0);
        var low = buffer.readUInt32BE(4);
        var sign = '';

        if (high < 0) {
                high = ~high + (low === 0);
                low = (~low + 1) >>> 0;
                sign = '-';
        }

        var result = '';
        var carry;
        var t;
        var digits;
        var pad;
        var l;
        var i;

        {
                carry = high % BASE;
                high = high / BASE >>> 0;

                t = 0x100000000 * carry + low;
                low = t / BASE >>> 0;
                digits = '' + (t - BASE * low);

                if (low === 0 && high === 0) {
                        return sign + digits + result;
                }

                pad = '';
                l = 6 - digits.length;

                for (i = 0; i < l; i++) {
                        pad += '0';
                }

                result = pad + digits + result;
        }

        {
                carry = high % BASE;
                high = high / BASE >>> 0;

                t = 0x100000000 * carry + low;
                low = t / BASE >>> 0;
                digits = '' + (t - BASE * low);

                if (low === 0 && high === 0) {
                        return sign + digits + result;
                }

                pad = '';
                l = 6 - digits.length;

                for (i = 0; i < l; i++) {
                        pad += '0';
                }

                result = pad + digits + result;
        }

        {
                carry = high % BASE;
                high = high / BASE >>> 0;

                t = 0x100000000 * carry + low;
                low = t / BASE >>> 0;
                digits = '' + (t - BASE * low);

                if (low === 0 && high === 0) {
                        return sign + digits + result;
                }

                pad = '';
                l = 6 - digits.length;

                for (i = 0; i < l; i++) {
                        pad += '0';
                }

                result = pad + digits + result;
        }

        {
                carry = high % BASE;
                t = 0x100000000 * carry + low;
                digits = '' + t % BASE;

                return sign + digits + result;
        }
}

module.exports = readInt8;