Util.js

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});
var toCodePoints = exports.toCodePoints = function toCodePoints(str) {
    var codePoints = [];
    var i = 0;
    var length = str.length;
    while (i < length) {
        var value = str.charCodeAt(i++);
        if (value >= 0xd800 && value <= 0xdbff && i < length) {
            var extra = str.charCodeAt(i++);
            if ((extra & 0xfc00) === 0xdc00) {
                codePoints.push(((value & 0x3ff) << 10) + (extra & 0x3ff) + 0x10000);
            } else {
                codePoints.push(value);
                i--;
            }
        } else {
            codePoints.push(value);
        }
    }
    return codePoints;
};

var fromCodePoint = exports.fromCodePoint = function fromCodePoint() {
    if (String.fromCodePoint) {
        return String.fromCodePoint.apply(String, arguments);
    }

    var length = arguments.length;
    if (!length) {
        return '';
    }

    var codeUnits = [];

    var index = -1;
    var result = '';
    while (++index < length) {
        var codePoint = arguments.length <= index ? undefined : arguments[index];
        if (codePoint <= 0xffff) {
            codeUnits.push(codePoint);
        } else {
            codePoint -= 0x10000;
            codeUnits.push((codePoint >> 10) + 0xd800, codePoint % 0x400 + 0xdc00);
        }
        if (index + 1 === length || codeUnits.length > 0x4000) {
            result += String.fromCharCode.apply(String, codeUnits);
            codeUnits.length = 0;
        }
    }
    return result;
};

var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';

// Use a lookup table to find the index.
var lookup = typeof Uint8Array === 'undefined' ? [] : new Uint8Array(256);
for (var i = 0; i < chars.length; i++) {
    lookup[chars.charCodeAt(i)] = i;
}

var decode = exports.decode = function decode(base64) {
    var bufferLength = base64.length * 0.75,
        len = base64.length,
        i = void 0,
        p = 0,
        encoded1 = void 0,
        encoded2 = void 0,
        encoded3 = void 0,
        encoded4 = void 0;

    if (base64[base64.length - 1] === '=') {
        bufferLength--;
        if (base64[base64.length - 2] === '=') {
            bufferLength--;
        }
    }

    var buffer = typeof ArrayBuffer !== 'undefined' && typeof Uint8Array !== 'undefined' && typeof Uint8Array.prototype.slice !== 'undefined' ? new ArrayBuffer(bufferLength) : new Array(bufferLength);
    var bytes = Array.isArray(buffer) ? buffer : new Uint8Array(buffer);

    for (i = 0; i < len; i += 4) {
        encoded1 = lookup[base64.charCodeAt(i)];
        encoded2 = lookup[base64.charCodeAt(i + 1)];
        encoded3 = lookup[base64.charCodeAt(i + 2)];
        encoded4 = lookup[base64.charCodeAt(i + 3)];

        bytes[p++] = encoded1 << 2 | encoded2 >> 4;
        bytes[p++] = (encoded2 & 15) << 4 | encoded3 >> 2;
        bytes[p++] = (encoded3 & 3) << 6 | encoded4 & 63;
    }

    return buffer;
};

var polyUint16Array = exports.polyUint16Array = function polyUint16Array(buffer) {
    var length = buffer.length;
    var bytes = [];
    for (var _i = 0; _i < length; _i += 2) {
        bytes.push(buffer[_i + 1] << 8 | buffer[_i]);
    }
    return bytes;
};

var polyUint32Array = exports.polyUint32Array = function polyUint32Array(buffer) {
    var length = buffer.length;
    var bytes = [];
    for (var _i2 = 0; _i2 < length; _i2 += 4) {
        bytes.push(buffer[_i2 + 3] << 24 | buffer[_i2 + 2] << 16 | buffer[_i2 + 1] << 8 | buffer[_i2]);
    }
    return bytes;
};