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Viewing file:     int64.js (1.94 KB)      -rw-r--r--

var util = require('../core').util;
var toBuffer = util.buffer.toBuffer;

/**
 * A lossless representation of a signed, 64-bit integer. Instances of this
 * class may be used in arithmetic expressions as if they were numeric
 * primitives, but the binary representation will be preserved unchanged as the
 * `bytes` property of the object. The bytes should be encoded as big-endian,
 * two's complement integers.
 * @param {Buffer} bytes
 *
 * @api private
 */
function Int64(bytes) {
    if (bytes.length !== 8) {
        throw new Error('Int64 buffers must be exactly 8 bytes');
    }
    if (!util.Buffer.isBuffer(bytes)) bytes = toBuffer(bytes);

    this.bytes = bytes;
}

/**
 * @param {number} number
 * @returns {Int64}
 *
 * @api private
 */
Int64.fromNumber = function(number) {
    if (number > 9223372036854775807 || number < -9223372036854775808) {
        throw new Error(
            number + ' is too large (or, if negative, too small) to represent as an Int64'
        );
    }

    var bytes = new Uint8Array(8);
    for (
        var i = 7, remaining = Math.abs(Math.round(number));
        i > -1 && remaining > 0;
        i--, remaining /= 256
    ) {
        bytes[i] = remaining;
    }

    if (number < 0) {
        negate(bytes);
    }

    return new Int64(bytes);
};

/**
 * @returns {number}
 *
 * @api private
 */
Int64.prototype.valueOf = function() {
    var bytes = this.bytes.slice(0);
    var negative = bytes[0] & 128;
    if (negative) {
        negate(bytes);
    }

    return parseInt(bytes.toString('hex'), 16) * (negative ? -1 : 1);
};

Int64.prototype.toString = function() {
    return String(this.valueOf());
};

/**
 * @param {Buffer} bytes
 *
 * @api private
 */
function negate(bytes) {
    for (var i = 0; i < 8; i++) {
        bytes[i] ^= 0xFF;
    }
    for (var i = 7; i > -1; i--) {
        bytes[i]++;
        if (bytes[i] !== 0) {
            break;
        }
    }
}

/**
 * @api private
 */
module.exports = {
    Int64: Int64
};