rtk-wms-uniapp/unit/CHITEN_SDK_APP/encoding.js

var _this;

import encodingIndexes from "./encoding-indexes.js"

(function(global) {
	'use strict';

	_this = global;

	if (typeof module !== "undefined" && module.exports &&
		!global["encoding-indexes"]) {
		global["encoding-indexes"] =
			require("./encoding-indexes.js")["encoding-indexes"];
	} else {
		// console.log(encodingIndexes);
		global["encoding-indexes"] = encodingIndexes;
	}


	function inRange(a, min, max) {
		return min <= a && a <= max;
	}

	function includes(array, item) {
		return array.indexOf(item) !== -1;
	}

	var floor = Math.floor;

	function ToDictionary(o) {
		if (o === undefined) return {};
		if (o === Object(o)) return o;
		throw TypeError('Could not convert argument to dictionary');
	}

	function stringToCodePoints(string) {

		var s = String(string);
		var n = s.length;
		var i = 0;
		var u = [];
		while (i < n) {

			var c = s.charCodeAt(i);
			if (c < 0xD800 || c > 0xDFFF) {
				u.push(c);
			} else if (0xDC00 <= c && c <= 0xDFFF) {
				u.push(0xFFFD);
			} else if (0xD800 <= c && c <= 0xDBFF) {
				if (i === n - 1) {
					u.push(0xFFFD);
				} else {
					var d = s.charCodeAt(i + 1);
					if (0xDC00 <= d && d <= 0xDFFF) {
						var a = c & 0x3FF;
						var b = d & 0x3FF;
						u.push(0x10000 + (a << 10) + b);
						i += 1;
					} else {
						u.push(0xFFFD);
					}
				}
			}
			i += 1;
		}
		return u;
	}

	function codePointsToString(code_points) {
		var s = '';
		for (var i = 0; i < code_points.length; ++i) {
			var cp = code_points[i];
			if (cp <= 0xFFFF) {
				s += String.fromCharCode(cp);
			} else {
				cp -= 0x10000;
				s += String.fromCharCode((cp >> 10) + 0xD800,
					(cp & 0x3FF) + 0xDC00);
			}
		}
		return s;
	}

	function isASCIIByte(a) {
		return 0x00 <= a && a <= 0x7F;
	}

	var isASCIICodePoint = isASCIIByte;
	var end_of_stream = -1;


	function Stream(tokens) {
		this.tokens = [].slice.call(tokens);
		this.tokens.reverse();
	}

	Stream.prototype = {

		endOfStream: function() {
			return !this.tokens.length;
		},

		read: function() {
			if (!this.tokens.length)
				return end_of_stream;
			return this.tokens.pop();
		},

		prepend: function(token) {
			if (Array.isArray(token)) {
				var tokens = /**@type {!Array.<number>}*/ (token);
				while (tokens.length)
					this.tokens.push(tokens.pop());
			} else {
				this.tokens.push(token);
			}
		},

		push: function(token) {
			if (Array.isArray(token)) {
				var tokens = /**@type {!Array.<number>}*/ (token);
				while (tokens.length)
					this.tokens.unshift(tokens.shift());
			} else {
				this.tokens.unshift(token);
			}
		}
	};

	var finished = -1;

	function decoderError(fatal, opt_code_point) {
		if (fatal)
			throw TypeError('Decoder error');
		return opt_code_point || 0xFFFD;
	}

	function encoderError(code_point) {
		throw TypeError('The code point ' + code_point + ' could not be encoded.');
	}

	/** @interface */
	function Decoder() {}
	Decoder.prototype = {
		handler: function(stream, bite) {}
	};

	/** @interface */
	function Encoder() {}
	Encoder.prototype = {
		handler: function(stream, code_point) {}
	};

	function getEncoding(label) {
		label = String(label).trim().toLowerCase();
		if (Object.prototype.hasOwnProperty.call(label_to_encoding, label)) {
			return label_to_encoding[label];
		}
		return null;
	}

	var encodings = [{
			"encodings": [{
				"labels": [
					"unicode-1-1-utf-8",
					"utf-8",
					"utf8"
				],
				"name": "UTF-8"
			}],
			"heading": "The Encoding"
		},
		{
			"encodings": [{
					"labels": [
						"866",
						"cp866",
						"csibm866",
						"ibm866"
					],
					"name": "IBM866"
				},
				{
					"labels": [
						"csisolatin2",
						"iso-8859-2",
						"iso-ir-101",
						"iso8859-2",
						"iso88592",
						"iso_8859-2",
						"iso_8859-2:1987",
						"l2",
						"latin2"
					],
					"name": "ISO-8859-2"
				},
				{
					"labels": [
						"csisolatin3",
						"iso-8859-3",
						"iso-ir-109",
						"iso8859-3",
						"iso88593",
						"iso_8859-3",
						"iso_8859-3:1988",
						"l3",
						"latin3"
					],
					"name": "ISO-8859-3"
				},
				{
					"labels": [
						"csisolatin4",
						"iso-8859-4",
						"iso-ir-110",
						"iso8859-4",
						"iso88594",
						"iso_8859-4",
						"iso_8859-4:1988",
						"l4",
						"latin4"
					],
					"name": "ISO-8859-4"
				},
				{
					"labels": [
						"csisolatincyrillic",
						"cyrillic",
						"iso-8859-5",
						"iso-ir-144",
						"iso8859-5",
						"iso88595",
						"iso_8859-5",
						"iso_8859-5:1988"
					],
					"name": "ISO-8859-5"
				},
				{
					"labels": [
						"arabic",
						"asmo-708",
						"csiso88596e",
						"csiso88596i",
						"csisolatinarabic",
						"ecma-114",
						"iso-8859-6",
						"iso-8859-6-e",
						"iso-8859-6-i",
						"iso-ir-127",
						"iso8859-6",
						"iso88596",
						"iso_8859-6",
						"iso_8859-6:1987"
					],
					"name": "ISO-8859-6"
				},
				{
					"labels": [
						"csisolatingreek",
						"ecma-118",
						"elot_928",
						"greek",
						"greek8",
						"iso-8859-7",
						"iso-ir-126",
						"iso8859-7",
						"iso88597",
						"iso_8859-7",
						"iso_8859-7:1987",
						"sun_eu_greek"
					],
					"name": "ISO-8859-7"
				},
				{
					"labels": [
						"csiso88598e",
						"csisolatinhebrew",
						"hebrew",
						"iso-8859-8",
						"iso-8859-8-e",
						"iso-ir-138",
						"iso8859-8",
						"iso88598",
						"iso_8859-8",
						"iso_8859-8:1988",
						"visual"
					],
					"name": "ISO-8859-8"
				},
				{
					"labels": [
						"csiso88598i",
						"iso-8859-8-i",
						"logical"
					],
					"name": "ISO-8859-8-I"
				},
				{
					"labels": [
						"csisolatin6",
						"iso-8859-10",
						"iso-ir-157",
						"iso8859-10",
						"iso885910",
						"l6",
						"latin6"
					],
					"name": "ISO-8859-10"
				},
				{
					"labels": [
						"iso-8859-13",
						"iso8859-13",
						"iso885913"
					],
					"name": "ISO-8859-13"
				},
				{
					"labels": [
						"iso-8859-14",
						"iso8859-14",
						"iso885914"
					],
					"name": "ISO-8859-14"
				},
				{
					"labels": [
						"csisolatin9",
						"iso-8859-15",
						"iso8859-15",
						"iso885915",
						"iso_8859-15",
						"l9"
					],
					"name": "ISO-8859-15"
				},
				{
					"labels": [
						"iso-8859-16"
					],
					"name": "ISO-8859-16"
				},
				{
					"labels": [
						"cskoi8r",
						"koi",
						"koi8",
						"koi8-r",
						"koi8_r"
					],
					"name": "KOI8-R"
				},
				{
					"labels": [
						"koi8-ru",
						"koi8-u"
					],
					"name": "KOI8-U"
				},
				{
					"labels": [
						"csmacintosh",
						"mac",
						"macintosh",
						"x-mac-roman"
					],
					"name": "macintosh"
				},
				{
					"labels": [
						"dos-874",
						"iso-8859-11",
						"iso8859-11",
						"iso885911",
						"tis-620",
						"windows-874"
					],
					"name": "windows-874"
				},
				{
					"labels": [
						"cp1250",
						"windows-1250",
						"x-cp1250"
					],
					"name": "windows-1250"
				},
				{
					"labels": [
						"cp1251",
						"windows-1251",
						"x-cp1251"
					],
					"name": "windows-1251"
				},
				{
					"labels": [
						"ansi_x3.4-1968",
						"ascii",
						"cp1252",
						"cp819",
						"csisolatin1",
						"ibm819",
						"iso-8859-1",
						"iso-ir-100",
						"iso8859-1",
						"iso88591",
						"iso_8859-1",
						"iso_8859-1:1987",
						"l1",
						"latin1",
						"us-ascii",
						"windows-1252",
						"x-cp1252"
					],
					"name": "windows-1252"
				},
				{
					"labels": [
						"cp1253",
						"windows-1253",
						"x-cp1253"
					],
					"name": "windows-1253"
				},
				{
					"labels": [
						"cp1254",
						"csisolatin5",
						"iso-8859-9",
						"iso-ir-148",
						"iso8859-9",
						"iso88599",
						"iso_8859-9",
						"iso_8859-9:1989",
						"l5",
						"latin5",
						"windows-1254",
						"x-cp1254"
					],
					"name": "windows-1254"
				},
				{
					"labels": [
						"cp1255",
						"windows-1255",
						"x-cp1255"
					],
					"name": "windows-1255"
				},
				{
					"labels": [
						"cp1256",
						"windows-1256",
						"x-cp1256"
					],
					"name": "windows-1256"
				},
				{
					"labels": [
						"cp1257",
						"windows-1257",
						"x-cp1257"
					],
					"name": "windows-1257"
				},
				{
					"labels": [
						"cp1258",
						"windows-1258",
						"x-cp1258"
					],
					"name": "windows-1258"
				},
				{
					"labels": [
						"x-mac-cyrillic",
						"x-mac-ukrainian"
					],
					"name": "x-mac-cyrillic"
				}
			],
			"heading": "Legacy single-byte encodings"
		},
		{
			"encodings": [{
					"labels": [
						"chinese",
						"csgb2312",
						"csiso58gb231280",
						"gb2312",
						"gb_2312",
						"gb_2312-80",
						"gbk",
						"iso-ir-58",
						"x-gbk"
					],
					"name": "GBK"
				},
				{
					"labels": [
						"gb18030"
					],
					"name": "gb18030"
				}
			],
			"heading": "Legacy multi-byte Chinese (simplified) encodings"
		},
		{
			"encodings": [{
				"labels": [
					"big5",
					"big5-hkscs",
					"cn-big5",
					"csbig5",
					"x-x-big5"
				],
				"name": "Big5"
			}],
			"heading": "Legacy multi-byte Chinese (traditional) encodings"
		},
		{
			"encodings": [{
					"labels": [
						"cseucpkdfmtjapanese",
						"euc-jp",
						"x-euc-jp"
					],
					"name": "EUC-JP"
				},
				{
					"labels": [
						"csiso2022jp",
						"iso-2022-jp"
					],
					"name": "ISO-2022-JP"
				},
				{
					"labels": [
						"csshiftjis",
						"ms932",
						"ms_kanji",
						"shift-jis",
						"shift_jis",
						"sjis",
						"windows-31j",
						"x-sjis"
					],
					"name": "Shift_JIS"
				}
			],
			"heading": "Legacy multi-byte Japanese encodings"
		},
		{
			"encodings": [{
				"labels": [
					"cseuckr",
					"csksc56011987",
					"euc-kr",
					"iso-ir-149",
					"korean",
					"ks_c_5601-1987",
					"ks_c_5601-1989",
					"ksc5601",
					"ksc_5601",
					"windows-949"
				],
				"name": "EUC-KR"
			}],
			"heading": "Legacy multi-byte Korean encodings"
		},
		{
			"encodings": [{
					"labels": [
						"csiso2022kr",
						"hz-gb-2312",
						"iso-2022-cn",
						"iso-2022-cn-ext",
						"iso-2022-kr"
					],
					"name": "replacement"
				},
				{
					"labels": [
						"utf-16be"
					],
					"name": "UTF-16BE"
				},
				{
					"labels": [
						"utf-16",
						"utf-16le"
					],
					"name": "UTF-16LE"
				},
				{
					"labels": [
						"x-user-defined"
					],
					"name": "x-user-defined"
				}
			],
			"heading": "Legacy miscellaneous encodings"
		}
	];

	/** @type {Object.<string,{name:string,labels:Array.<string>}>} */
	var label_to_encoding = {};
	encodings.forEach(function(category) {
		category.encodings.forEach(function(encoding) {
			encoding.labels.forEach(function(label) {
				label_to_encoding[label] = encoding;
			});
		});
	});

	/** @type {Object.<string, function({fatal:boolean}): Encoder>} */
	var encoders = {};
	/** @type {Object.<string, function({fatal:boolean}): Decoder>} */
	var decoders = {};

	function indexCodePointFor(pointer, index) {
		if (!index) return null;
		return index[pointer] || null;
	}

	function indexPointerFor(code_point, index) {
		var pointer = index.indexOf(code_point);
		return pointer === -1 ? null : pointer;
	}

	function index(name) {
		if (!('encoding-indexes' in global)) {
			throw Error("Indexes missing." +
				" Did you forget to include encoding-indexes.js first?");
		}
		return global['encoding-indexes'][name];
	}

	function indexGB18030RangesCodePointFor(pointer) {
		if ((pointer > 39419 && pointer < 189000) || (pointer > 1237575))
			return null;
		if (pointer === 7457) return 0xE7C7;
		var offset = 0;
		var code_point_offset = 0;
		var idx = index('gb18030-ranges');
		var i;
		for (i = 0; i < idx.length; ++i) {
			/** @type {!Array.<number>} */
			var entry = idx[i];
			if (entry[0] <= pointer) {
				offset = entry[0];
				code_point_offset = entry[1];
			} else {
				break;
			}
		}

		return code_point_offset + pointer - offset;
	}


	function indexGB18030RangesPointerFor(code_point) {
		if (code_point === 0xE7C7) return 7457;

		var offset = 0;
		var pointer_offset = 0;
		var idx = index('gb18030-ranges');
		var i;
		for (i = 0; i < idx.length; ++i) {
			/** @type {!Array.<number>} */
			var entry = idx[i];
			if (entry[1] <= code_point) {
				offset = entry[1];
				pointer_offset = entry[0];
			} else {
				break;
			}
		}

		return pointer_offset + code_point - offset;
	}

	function indexShiftJISPointerFor(code_point) {
		shift_jis_index = shift_jis_index ||
			index('jis0208').map(function(code_point, pointer) {
				return inRange(pointer, 8272, 8835) ? null : code_point;
			});
		var index_ = shift_jis_index;
		return index_.indexOf(code_point);
	}
	var shift_jis_index;

	function indexBig5PointerFor(code_point) {
		big5_index_no_hkscs = big5_index_no_hkscs ||
			index('big5').map(function(code_point, pointer) {
				return (pointer < (0xA1 - 0x81) * 157) ? null : code_point;
			});
		var index_ = big5_index_no_hkscs;
		if (code_point === 0x2550 || code_point === 0x255E ||
			code_point === 0x2561 || code_point === 0x256A ||
			code_point === 0x5341 || code_point === 0x5345) {
			return index_.lastIndexOf(code_point);
		}
		return indexPointerFor(code_point, index_);
	}
	var big5_index_no_hkscs;



	/** @const */
	var DEFAULT_ENCODING = 'utf-8';


	function TextDecoder(label, options) {
		// if (!(this instanceof TextDecoder))
		// 	throw TypeError('Called as a function. Did you forget \'new\'?');
		label = label !== undefined ? String(label) : DEFAULT_ENCODING;
		options = ToDictionary(options);
		/** @private */
		this._encoding = null;
		/** @private @type {?Decoder} */
		this._decoder = null;
		/** @private @type {boolean} */
		this._ignoreBOM = false;
		/** @private @type {boolean} */
		this._BOMseen = false;
		/** @private @type {string} */
		this._error_mode = 'replacement';
		/** @private @type {boolean} */
		this._do_not_flush = false;


		var encoding = getEncoding(label);

		if (encoding === null || encoding.name === 'replacement')
			throw RangeError('Unknown encoding: ' + label);
		if (!decoders[encoding.name]) {
			throw Error('Decoder not present.' +
				' Did you forget to include encoding-indexes.js first?');
		}

		var dec = this;

		dec._encoding = encoding;

		if (Boolean(options['fatal']))
			dec._error_mode = 'fatal';

		if (Boolean(options['ignoreBOM']))
			dec._ignoreBOM = true;

		if (!Object.defineProperty) {
			this.encoding = dec._encoding.name.toLowerCase();
			this.fatal = dec._error_mode === 'fatal';
			this.ignoreBOM = dec._ignoreBOM;
		}

		return dec;
	}

	if (Object.defineProperty) {
		Object.defineProperty(TextDecoder.prototype, 'encoding', {
			/** @this {TextDecoder} */
			get: function() {
				return this._encoding.name.toLowerCase();
			}
		});

		Object.defineProperty(TextDecoder.prototype, 'fatal', {
			/** @this {TextDecoder} */
			get: function() {
				return this._error_mode === 'fatal';
			}
		});

		Object.defineProperty(TextDecoder.prototype, 'ignoreBOM', {
			/** @this {TextDecoder} */
			get: function() {
				return this._ignoreBOM;
			}
		});
	}

	TextDecoder.prototype.decode = function decode(input, options) {
		var bytes;
		if (typeof input === 'object' && input instanceof ArrayBuffer) {
			bytes = new Uint8Array(input);
		} else if (typeof input === 'object' && 'buffer' in input &&
			input.buffer instanceof ArrayBuffer) {
			bytes = new Uint8Array(input.buffer,
				input.byteOffset,
				input.byteLength);
		} else {
			bytes = new Uint8Array(0);
		}

		options = ToDictionary(options);

		if (!this._do_not_flush) {
			this._decoder = decoders[this._encoding.name]({
				fatal: this._error_mode === 'fatal'
			});
			this._BOMseen = false;
		}


		this._do_not_flush = Boolean(options['stream']);

		var input_stream = new Stream(bytes);

		var output = [];

		/** @type {?(number|!Array.<number>)} */
		var result;


		while (true) {

			var token = input_stream.read();
			if (token === end_of_stream)
				break;

			result = this._decoder.handler(input_stream, token);

			if (result === finished)
				break;

			if (result !== null) {
				if (Array.isArray(result))
					output.push.apply(output, /**@type {!Array.<number>}*/ (result));
				else
					output.push(result);
			}

		}

		if (!this._do_not_flush) {
			do {
				result = this._decoder.handler(input_stream, input_stream.read());
				if (result === finished)
					break;
				if (result === null)
					continue;
				if (Array.isArray(result))
					output.push.apply(output, /**@type {!Array.<number>}*/ (result));
				else
					output.push(result);
			} while (!input_stream.endOfStream());
			this._decoder = null;
		}


		function serializeStream(stream) {

			if (includes(['UTF-8', 'UTF-16LE', 'UTF-16BE'], this._encoding.name) &&
				!this._ignoreBOM && !this._BOMseen) {
				if (stream.length > 0 && stream[0] === 0xFEFF) {

					this._BOMseen = true;
					stream.shift();
				} else if (stream.length > 0) {

					this._BOMseen = true;
				} else {

				}
			}

			return codePointsToString(stream);
		}

		return serializeStream.call(this, output);
	};


	function TextEncoder(label, options) {
		// if (!(this instanceof TextEncoder))
		// 	throw TypeError('Called as a function. Did you forget \'new\'?');
		options = ToDictionary(options);


		/** @private */
		this._encoding = null;
		/** @private @type {?Encoder} */
		this._encoder = null;


		/** @private @type {boolean} */
		this._do_not_flush = false;
		/** @private @type {string} */
		this._fatal = Boolean(options['fatal']) ? 'fatal' : 'replacement';


		var enc = this;

		if (options['NONSTANDARD_allowLegacyEncoding']) {
			label = label !== undefined ? String(label) : DEFAULT_ENCODING;
			var encoding = getEncoding(label);
			if (encoding === null || encoding.name === 'replacement')
				throw RangeError('Unknown encoding: ' + label);
			if (!encoders[encoding.name]) {
				throw Error('Encoder not present.' +
					' Did you forget to include encoding-indexes.js first?');
			}
			enc._encoding = encoding;
		} else {

			enc._encoding = getEncoding('utf-8');

			if (label !== undefined && 'console' in global) {
				console.warn('TextEncoder constructor called with encoding label, ' +
					'which is ignored.');
			}
		}

		if (!Object.defineProperty)
			this.encoding = enc._encoding.name.toLowerCase();


		return enc;
	}

	if (Object.defineProperty) {
		Object.defineProperty(TextEncoder.prototype, 'encoding', {
			/** @this {TextEncoder} */
			get: function() {
				return this._encoding.name.toLowerCase();
			}
		});
	}

	function encode(opt_string, options) {
		opt_string = opt_string === undefined ? '' : String(opt_string);
		options = ToDictionary(options);

		if (!this._do_not_flush)
			this._encoder = encoders[this._encoding.name]({
				fatal: this._fatal === 'fatal'
			});
		this._do_not_flush = Boolean(options['stream']);


		var input = new Stream(stringToCodePoints(opt_string));


		var output = [];

		/** @type {?(number|!Array.<number>)} */
		var result;
		while (true) {
			var token = input.read();
			if (token === end_of_stream)
				break;
			result = this._encoder.handler(input, token);
			if (result === finished)
				break;
			if (Array.isArray(result))
				output.push.apply(output, /**@type {!Array.<number>}*/ (result));
			else
				output.push(result);
		}

		if (!this._do_not_flush) {
			while (true) {
				result = this._encoder.handler(input, input.read());
				if (result === finished)
					break;
				if (Array.isArray(result))
					output.push.apply(output, /**@type {!Array.<number>}*/ (result));
				else
					output.push(result);
			}
			this._encoder = null;
		}

		return new Uint8Array(output);
	};

	// TextEncoder.prototype.encode = function encode(opt_string, options) {
	// 	opt_string = opt_string === undefined ? '' : String(opt_string);
	// 	options = ToDictionary(options);


	// 	if (!this._do_not_flush)
	// 		this._encoder = encoders[this._encoding.name]({
	// 			fatal: this._fatal === 'fatal'
	// 		});
	// 	this._do_not_flush = Boolean(options['stream']);


	// 	var input = new Stream(stringToCodePoints(opt_string));


	// 	var output = [];

	// 	/** @type {?(number|!Array.<number>)} */
	// 	var result;
	// 	while (true) {
	// 		var token = input.read();
	// 		if (token === end_of_stream)
	// 			break;
	// 		result = this._encoder.handler(input, token);
	// 		if (result === finished)
	// 			break;
	// 		if (Array.isArray(result))
	// 			output.push.apply(output, /**@type {!Array.<number>}*/ (result));
	// 		else
	// 			output.push(result);
	// 	}

	// 	if (!this._do_not_flush) {
	// 		while (true) {
	// 			result = this._encoder.handler(input, input.read());
	// 			if (result === finished)
	// 				break;
	// 			if (Array.isArray(result))
	// 				output.push.apply(output, /**@type {!Array.<number>}*/ (result));
	// 			else
	// 				output.push(result);
	// 		}
	// 		this._encoder = null;
	// 	}

	// 	return new Uint8Array(output);
	// };

	function UTF8Decoder(options) {
		var fatal = options.fatal;

		var /** @type {number} */ utf8_code_point = 0,
			/** @type {number} */
			utf8_bytes_seen = 0,
			/** @type {number} */
			utf8_bytes_needed = 0,
			/** @type {number} */
			utf8_lower_boundary = 0x80,
			/** @type {number} */
			utf8_upper_boundary = 0xBF;


		this.handler = function(stream, bite) {

			if (bite === end_of_stream && utf8_bytes_needed !== 0) {
				utf8_bytes_needed = 0;
				return decoderError(fatal);
			}

			if (bite === end_of_stream)
				return finished;

			if (utf8_bytes_needed === 0) {

				if (inRange(bite, 0x00, 0x7F)) {
					return bite;
				} else if (inRange(bite, 0xC2, 0xDF)) {
					utf8_bytes_needed = 1;

					utf8_code_point = bite & 0x1F;
				} else if (inRange(bite, 0xE0, 0xEF)) {
					if (bite === 0xE0)
						utf8_lower_boundary = 0xA0;
					if (bite === 0xED)
						utf8_upper_boundary = 0x9F;
					utf8_bytes_needed = 2;
					utf8_code_point = bite & 0xF;
				} else if (inRange(bite, 0xF0, 0xF4)) {
					if (bite === 0xF0)
						utf8_lower_boundary = 0x90;
					if (bite === 0xF4)
						utf8_upper_boundary = 0x8F;
					utf8_bytes_needed = 3;
					utf8_code_point = bite & 0x7;
				} else {
					return decoderError(fatal);
				}

				return null;
			}

			if (!inRange(bite, utf8_lower_boundary, utf8_upper_boundary)) {

				utf8_code_point = utf8_bytes_needed = utf8_bytes_seen = 0;
				utf8_lower_boundary = 0x80;
				utf8_upper_boundary = 0xBF;


				stream.prepend(bite);


				return decoderError(fatal);
			}

			utf8_lower_boundary = 0x80;
			utf8_upper_boundary = 0xBF;


			utf8_code_point = (utf8_code_point << 6) | (bite & 0x3F);


			utf8_bytes_seen += 1;


			if (utf8_bytes_seen !== utf8_bytes_needed)
				return null;


			var code_point = utf8_code_point;


			utf8_code_point = utf8_bytes_needed = utf8_bytes_seen = 0;

			return code_point;
		};
	}


	/**
	 * @constructor
	 * @implements {Encoder}
	 * @param {{fatal: boolean}} options
	 */
	function UTF8Encoder(options) {
		var fatal = options.fatal;
		/**
		 * @param {Stream} stream Input stream.
		 * @param {number} code_point Next code point read from the stream.
		 * @return {(number|!Array.<number>)} Byte(s) to emit.
		 */
		this.handler = function(stream, code_point) {
			if (code_point === end_of_stream)
				return finished;

			if (isASCIICodePoint(code_point))
				return code_point;

			var count, offset;
			if (inRange(code_point, 0x0080, 0x07FF)) {
				count = 1;
				offset = 0xC0;
			} else if (inRange(code_point, 0x0800, 0xFFFF)) {
				count = 2;
				offset = 0xE0;
			} else if (inRange(code_point, 0x10000, 0x10FFFF)) {
				count = 3;
				offset = 0xF0;
			}

			var bytes = [(code_point >> (6 * count)) + offset];

			while (count > 0) {
				var temp = code_point >> (6 * (count - 1));
				bytes.push(0x80 | (temp & 0x3F));
				count -= 1;
			}

			return bytes;
		};
	}

	/** @param {{fatal: boolean}} options */
	encoders['UTF-8'] = function(options) {
		return new UTF8Encoder(options);
	};
	/** @param {{fatal: boolean}} options */
	decoders['UTF-8'] = function(options) {
		return new UTF8Decoder(options);
	};

	/**
	 * @constructor
	 * @implements {Decoder}
	 * @param {!Array.<number>} index The encoding index.
	 * @param {{fatal: boolean}} options
	 */
	function SingleByteDecoder(index, options) {
		var fatal = options.fatal;

		this.handler = function(stream, bite) {
			if (bite === end_of_stream)
				return finished;

			if (isASCIIByte(bite))
				return bite;

			var code_point = index[bite - 0x80];

			if (code_point === null)
				return decoderError(fatal);

			return code_point;
		};
	}

	/**
	 * @constructor
	 * @implements {Encoder}
	 * @param {!Array.<?number>} index The encoding index.
	 * @param {{fatal: boolean}} options
	 */
	function SingleByteEncoder(index, options) {
		var fatal = options.fatal;

		this.handler = function(stream, code_point) {
			if (code_point === end_of_stream)
				return finished;

			if (isASCIICodePoint(code_point))
				return code_point;

			var pointer = indexPointerFor(code_point, index);

			if (pointer === null)
				encoderError(code_point);
			return pointer + 0x80;
		};
	}

	(function() {
		if (!('encoding-indexes' in global))
			return;
		encodings.forEach(function(category) {
			if (category.heading !== 'Legacy single-byte encodings')
				return;
			category.encodings.forEach(function(encoding) {
				var name = encoding.name;
				var idx = index(name.toLowerCase());
				/** @param {{fatal: boolean}} options */
				decoders[name] = function(options) {
					return new SingleByteDecoder(idx, options);
				};
				/** @param {{fatal: boolean}} options */
				encoders[name] = function(options) {
					return new SingleByteEncoder(idx, options);
				};
			});
		});
	}());


	/** @param {{fatal: boolean}} options */
	decoders['GBK'] = function(options) {
		return new GB18030Decoder(options);
	};

	/** @param {{fatal: boolean}} options */
	encoders['GBK'] = function(options) {
		return new GB18030Encoder(options, true);
	};

	/**
	 * @constructor
	 * @implements {Decoder}
	 * @param {{fatal: boolean}} options
	 */
	function GB18030Decoder(options) {
		var fatal = options.fatal;

		var /** @type {number} */ gb18030_first = 0x00,
			/** @type {number} */
			gb18030_second = 0x00,
			/** @type {number} */
			gb18030_third = 0x00;

		this.handler = function(stream, bite) {
			if (bite === end_of_stream && gb18030_first === 0x00 &&
				gb18030_second === 0x00 && gb18030_third === 0x00) {
				return finished;
			}

			if (bite === end_of_stream &&
				(gb18030_first !== 0x00 || gb18030_second !== 0x00 ||
					gb18030_third !== 0x00)) {
				gb18030_first = 0x00;
				gb18030_second = 0x00;
				gb18030_third = 0x00;
				decoderError(fatal);
			}
			var code_point;
			if (gb18030_third !== 0x00) {
				code_point = null;
				if (inRange(bite, 0x30, 0x39)) {
					code_point = indexGB18030RangesCodePointFor(
						(((gb18030_first - 0x81) * 10 + gb18030_second - 0x30) * 126 +
							gb18030_third - 0x81) * 10 + bite - 0x30);
				}

				var buffer = [gb18030_second, gb18030_third, bite];

				gb18030_first = 0x00;
				gb18030_second = 0x00;
				gb18030_third = 0x00;

				if (code_point === null) {
					stream.prepend(buffer);
					return decoderError(fatal);
				}

				return code_point;
			}

			if (gb18030_second !== 0x00) {

				if (inRange(bite, 0x81, 0xFE)) {
					gb18030_third = bite;
					return null;
				}

				stream.prepend([gb18030_second, bite]);
				gb18030_first = 0x00;
				gb18030_second = 0x00;
				return decoderError(fatal);
			}

			if (gb18030_first !== 0x00) {

				if (inRange(bite, 0x30, 0x39)) {
					gb18030_second = bite;
					return null;
				}

				var lead = gb18030_first;
				var pointer = null;
				gb18030_first = 0x00;

				var offset = bite < 0x7F ? 0x40 : 0x41;

				if (inRange(bite, 0x40, 0x7E) || inRange(bite, 0x80, 0xFE))
					pointer = (lead - 0x81) * 190 + (bite - offset);

				code_point = pointer === null ? null :
					indexCodePointFor(pointer, index('gb18030'));

				if (code_point === null && isASCIIByte(bite))
					stream.prepend(bite);

				if (code_point === null)
					return decoderError(fatal);

				return code_point;
			}

			if (isASCIIByte(bite))
				return bite;

			if (bite === 0x80)
				return 0x20AC;

			if (inRange(bite, 0x81, 0xFE)) {
				gb18030_first = bite;
				return null;
			}

			return decoderError(fatal);
		};
	}

	/**
	 * @constructor
	 * @implements {Encoder}
	 * @param {{fatal: boolean}} options
	 * @param {boolean=} gbk_flag
	 */
	function GB18030Encoder(options, gbk_flag) {
		var fatal = options.fatal;
		/**
		 * @param {Stream} stream Input stream.
		 * @param {number} code_point Next code point read from the stream.
		 * @return {(number|!Array.<number>)} Byte(s) to emit.
		 */
		this.handler = function(stream, code_point) {
			if (code_point === end_of_stream)
				return finished;

			if (isASCIICodePoint(code_point))
				return code_point;

			if (code_point === 0xE5E5)
				return encoderError(code_point);

			if (gbk_flag && code_point === 0x20AC)
				return 0x80;


			var pointer = indexPointerFor(code_point, index('gb18030'));

			if (pointer !== null) {

				var lead = floor(pointer / 190) + 0x81;

				var trail = pointer % 190;

				var offset = trail < 0x3F ? 0x40 : 0x41;

				return [lead, trail + offset];
			}

			if (gbk_flag)
				return encoderError(code_point);

			pointer = indexGB18030RangesPointerFor(code_point);

			var byte1 = floor(pointer / 10 / 126 / 10);

			pointer = pointer - byte1 * 10 * 126 * 10;

			var byte2 = floor(pointer / 10 / 126);

			pointer = pointer - byte2 * 10 * 126;

			var byte3 = floor(pointer / 10);

			var byte4 = pointer - byte3 * 10;

			return [byte1 + 0x81,
				byte2 + 0x30,
				byte3 + 0x81,
				byte4 + 0x30
			];
		};
	}

	/** @param {{fatal: boolean}} options */
	encoders['gb18030'] = function(options) {
		return new GB18030Encoder(options);
	};
	/** @param {{fatal: boolean}} options */
	decoders['gb18030'] = function(options) {
		return new GB18030Decoder(options);
	};

	/**
	 * @constructor
	 * @implements {Decoder}
	 * @param {{fatal: boolean}} options
	 */
	function Big5Decoder(options) {
		var fatal = options.fatal;
		var /** @type {number} */ Big5_lead = 0x00;


		this.handler = function(stream, bite) {
			if (bite === end_of_stream && Big5_lead !== 0x00) {
				Big5_lead = 0x00;
				return decoderError(fatal);
			}

			if (bite === end_of_stream && Big5_lead === 0x00)
				return finished;

			if (Big5_lead !== 0x00) {
				var lead = Big5_lead;
				var pointer = null;
				Big5_lead = 0x00;

				var offset = bite < 0x7F ? 0x40 : 0x62;

				if (inRange(bite, 0x40, 0x7E) || inRange(bite, 0xA1, 0xFE))
					pointer = (lead - 0x81) * 157 + (bite - offset);

				switch (pointer) {
					case 1133:
						return [0x00CA, 0x0304];
					case 1135:
						return [0x00CA, 0x030C];
					case 1164:
						return [0x00EA, 0x0304];
					case 1166:
						return [0x00EA, 0x030C];
				}


				var code_point = (pointer === null) ? null :
					indexCodePointFor(pointer, index('big5'));

				if (code_point === null && isASCIIByte(bite))
					stream.prepend(bite);

				if (code_point === null)
					return decoderError(fatal);

				return code_point;
			}

			if (isASCIIByte(bite))
				return bite;

			if (inRange(bite, 0x81, 0xFE)) {
				Big5_lead = bite;
				return null;
			}

			return decoderError(fatal);
		};
	}

	/**
	 * @constructor
	 * @implements {Encoder}
	 * @param {{fatal: boolean}} options
	 */
	function Big5Encoder(options) {
		var fatal = options.fatal;

		this.handler = function(stream, code_point) {
			if (code_point === end_of_stream)
				return finished;

			if (isASCIICodePoint(code_point))
				return code_point;

			var pointer = indexBig5PointerFor(code_point);

			if (pointer === null)
				return encoderError(code_point);

			var lead = floor(pointer / 157) + 0x81;

			if (lead < 0xA1)
				return encoderError(code_point);

			var trail = pointer % 157;

			var offset = trail < 0x3F ? 0x40 : 0x62;

			return [lead, trail + offset];
		};
	}

	/** @param {{fatal: boolean}} options */
	encoders['Big5'] = function(options) {
		return new Big5Encoder(options);
	};
	/** @param {{fatal: boolean}} options */
	decoders['Big5'] = function(options) {
		return new Big5Decoder(options);
	};


	/**
	 * @constructor
	 * @implements {Decoder}
	 * @param {{fatal: boolean}} options
	 */
	function EUCJPDecoder(options) {
		var fatal = options.fatal;

		var /** @type {boolean} */ eucjp_jis0212_flag = false,
			/** @type {number} */
			eucjp_lead = 0x00;


		this.handler = function(stream, bite) {
			if (bite === end_of_stream && eucjp_lead !== 0x00) {
				eucjp_lead = 0x00;
				return decoderError(fatal);
			}

			if (bite === end_of_stream && eucjp_lead === 0x00)
				return finished;

			if (eucjp_lead === 0x8E && inRange(bite, 0xA1, 0xDF)) {
				eucjp_lead = 0x00;
				return 0xFF61 - 0xA1 + bite;
			}

			if (eucjp_lead === 0x8F && inRange(bite, 0xA1, 0xFE)) {
				eucjp_jis0212_flag = true;
				eucjp_lead = bite;
				return null;
			}

			if (eucjp_lead !== 0x00) {
				var lead = eucjp_lead;
				eucjp_lead = 0x00;

				var code_point = null;

				if (inRange(lead, 0xA1, 0xFE) && inRange(bite, 0xA1, 0xFE)) {
					code_point = indexCodePointFor(
						(lead - 0xA1) * 94 + (bite - 0xA1),
						index(!eucjp_jis0212_flag ? 'jis0208' : 'jis0212'));
				}

				eucjp_jis0212_flag = false;

				if (!inRange(bite, 0xA1, 0xFE))
					stream.prepend(bite);

				if (code_point === null)
					return decoderError(fatal);

				return code_point;
			}

			if (isASCIIByte(bite))
				return bite;

			if (bite === 0x8E || bite === 0x8F || inRange(bite, 0xA1, 0xFE)) {
				eucjp_lead = bite;
				return null;
			}

			return decoderError(fatal);
		};
	}

	/**
	 * @constructor
	 * @implements {Encoder}
	 * @param {{fatal: boolean}} options
	 */
	function EUCJPEncoder(options) {
		var fatal = options.fatal;

		this.handler = function(stream, code_point) {
			if (code_point === end_of_stream)
				return finished;

			if (isASCIICodePoint(code_point))
				return code_point;

			if (code_point === 0x00A5)
				return 0x5C;

			if (code_point === 0x203E)
				return 0x7E;


			if (inRange(code_point, 0xFF61, 0xFF9F))
				return [0x8E, code_point - 0xFF61 + 0xA1];

			if (code_point === 0x2212)
				code_point = 0xFF0D;

			var pointer = indexPointerFor(code_point, index('jis0208'));

			if (pointer === null)
				return encoderError(code_point);

			var lead = floor(pointer / 94) + 0xA1;

			var trail = pointer % 94 + 0xA1;

			return [lead, trail];
		};
	}

	/** @param {{fatal: boolean}} options */
	encoders['EUC-JP'] = function(options) {
		return new EUCJPEncoder(options);
	};
	/** @param {{fatal: boolean}} options */
	decoders['EUC-JP'] = function(options) {
		return new EUCJPDecoder(options);
	};

	/**
	 * @constructor
	 * @implements {Decoder}
	 * @param {{fatal: boolean}} options
	 */
	function ISO2022JPDecoder(options) {
		var fatal = options.fatal;
		/** @enum */
		var states = {
			ASCII: 0,
			Roman: 1,
			Katakana: 2,
			LeadByte: 3,
			TrailByte: 4,
			EscapeStart: 5,
			Escape: 6
		};

		var /** @type {number} */ iso2022jp_decoder_state = states.ASCII,
			/** @type {number} */
			iso2022jp_decoder_output_state = states.ASCII,
			/** @type {number} */
			iso2022jp_lead = 0x00,
			/** @type {boolean} */
			iso2022jp_output_flag = false;

		this.handler = function(stream, bite) {
			switch (iso2022jp_decoder_state) {
				default:
				case states.ASCII:

					if (bite === 0x1B) {

						iso2022jp_decoder_state = states.EscapeStart;
						return null;
					}

					if (inRange(bite, 0x00, 0x7F) && bite !== 0x0E &&
						bite !== 0x0F && bite !== 0x1B) {

						iso2022jp_output_flag = false;
						return bite;
					}

					if (bite === end_of_stream) {
						return finished;
					}

					iso2022jp_output_flag = false;
					return decoderError(fatal);

				case states.Roman:



					if (bite === 0x1B) {
						iso2022jp_decoder_state = states.EscapeStart;
						return null;
					}

					if (bite === 0x5C) {
						iso2022jp_output_flag = false;
						return 0x00A5;
					}

					if (bite === 0x7E) {

						iso2022jp_output_flag = false;
						return 0x203E;
					}

					if (inRange(bite, 0x00, 0x7F) && bite !== 0x0E && bite !== 0x0F &&
						bite !== 0x1B && bite !== 0x5C && bite !== 0x7E) {
						iso2022jp_output_flag = false;
						return bite;
					}

					if (bite === end_of_stream) {
						return finished;
					}

					iso2022jp_output_flag = false;
					return decoderError(fatal);

				case states.Katakana:
					if (bite === 0x1B) {
						iso2022jp_decoder_state = states.EscapeStart;
						return null;
					}

					if (inRange(bite, 0x21, 0x5F)) {
						iso2022jp_output_flag = false;
						return 0xFF61 - 0x21 + bite;
					}

					if (bite === end_of_stream) {
						return finished;
					}

					iso2022jp_output_flag = false;
					return decoderError(fatal);

				case states.LeadByte:

					if (bite === 0x1B) {
						iso2022jp_decoder_state = states.EscapeStart;
						return null;
					}

					if (inRange(bite, 0x21, 0x7E)) {
						iso2022jp_output_flag = false;
						iso2022jp_lead = bite;
						iso2022jp_decoder_state = states.TrailByte;
						return null;
					}

					if (bite === end_of_stream) {
						return finished;
					}

					iso2022jp_output_flag = false;
					return decoderError(fatal);

				case states.TrailByte:

					if (bite === 0x1B) {

						iso2022jp_decoder_state = states.EscapeStart;
						return decoderError(fatal);
					}

					if (inRange(bite, 0x21, 0x7E)) {
						iso2022jp_decoder_state = states.LeadByte;

						var pointer = (iso2022jp_lead - 0x21) * 94 + bite - 0x21;

						var code_point = indexCodePointFor(pointer, index('jis0208'));

						if (code_point === null)
							return decoderError(fatal);

						return code_point;
					}

					if (bite === end_of_stream) {
						iso2022jp_decoder_state = states.LeadByte;
						stream.prepend(bite);
						return decoderError(fatal);
					}

					iso2022jp_decoder_state = states.LeadByte;
					return decoderError(fatal);

				case states.EscapeStart:

					if (bite === 0x24 || bite === 0x28) {
						iso2022jp_lead = bite;
						iso2022jp_decoder_state = states.Escape;
						return null;
					}

					stream.prepend(bite);

					iso2022jp_output_flag = false;
					iso2022jp_decoder_state = iso2022jp_decoder_output_state;
					return decoderError(fatal);

				case states.Escape:

					var lead = iso2022jp_lead;
					iso2022jp_lead = 0x00;

					var state = null;

					if (lead === 0x28 && bite === 0x42)
						state = states.ASCII;

					if (lead === 0x28 && bite === 0x4A)
						state = states.Roman;

					if (lead === 0x28 && bite === 0x49)
						state = states.Katakana;

					if (lead === 0x24 && (bite === 0x40 || bite === 0x42))
						state = states.LeadByte;

					if (state !== null) {

						iso2022jp_decoder_state = iso2022jp_decoder_state = state;

						var output_flag = iso2022jp_output_flag;

						iso2022jp_output_flag = true;

						return !output_flag ? null : decoderError(fatal);
					}

					stream.prepend([lead, bite]);

					iso2022jp_output_flag = false;
					iso2022jp_decoder_state = iso2022jp_decoder_output_state;
					return decoderError(fatal);
			}
		};
	}

	/**
	 * @constructor
	 * @implements {Encoder}
	 * @param {{fatal: boolean}} options
	 */
	function ISO2022JPEncoder(options) {
		var fatal = options.fatal;

		/** @enum */
		var states = {
			ASCII: 0,
			Roman: 1,
			jis0208: 2
		};
		var /** @type {number} */ iso2022jp_state = states.ASCII;
		/**
		 * @param {Stream} stream Input stream.
		 * @param {number} code_point Next code point read from the stream.
		 * @return {(number|!Array.<number>)} Byte(s) to emit.
		 */
		this.handler = function(stream, code_point) {

			if (code_point === end_of_stream &&
				iso2022jp_state !== states.ASCII) {
				stream.prepend(code_point);
				iso2022jp_state = states.ASCII;
				return [0x1B, 0x28, 0x42];
			}

			if (code_point === end_of_stream && iso2022jp_state === states.ASCII)
				return finished;

			if ((iso2022jp_state === states.ASCII ||
					iso2022jp_state === states.Roman) &&
				(code_point === 0x000E || code_point === 0x000F ||
					code_point === 0x001B)) {
				return encoderError(0xFFFD);
			}

			if (iso2022jp_state === states.ASCII &&
				isASCIICodePoint(code_point))
				return code_point;


			if (iso2022jp_state === states.Roman &&
				((isASCIICodePoint(code_point) &&
						code_point !== 0x005C && code_point !== 0x007E) ||
					(code_point == 0x00A5 || code_point == 0x203E))) {


				if (isASCIICodePoint(code_point))
					return code_point;


				if (code_point === 0x00A5)
					return 0x5C;

				if (code_point === 0x203E)
					return 0x7E;
			}

			if (isASCIICodePoint(code_point) &&
				iso2022jp_state !== states.ASCII) {
				stream.prepend(code_point);
				iso2022jp_state = states.ASCII;
				return [0x1B, 0x28, 0x42];
			}


			if ((code_point === 0x00A5 || code_point === 0x203E) &&
				iso2022jp_state !== states.Roman) {
				stream.prepend(code_point);
				iso2022jp_state = states.Roman;
				return [0x1B, 0x28, 0x4A];
			}

			if (code_point === 0x2212)
				code_point = 0xFF0D;


			var pointer = indexPointerFor(code_point, index('jis0208'));


			if (pointer === null)
				return encoderError(code_point);


			if (iso2022jp_state !== states.jis0208) {
				stream.prepend(code_point);
				iso2022jp_state = states.jis0208;
				return [0x1B, 0x24, 0x42];
			}

			var lead = floor(pointer / 94) + 0x21;

			var trail = pointer % 94 + 0x21;

			return [lead, trail];
		};
	}

	/** @param {{fatal: boolean}} options */
	encoders['ISO-2022-JP'] = function(options) {
		return new ISO2022JPEncoder(options);
	};
	/** @param {{fatal: boolean}} options */
	decoders['ISO-2022-JP'] = function(options) {
		return new ISO2022JPDecoder(options);
	};


	/**
	 * @constructor
	 * @implements {Decoder}
	 * @param {{fatal: boolean}} options
	 */
	function ShiftJISDecoder(options) {
		var fatal = options.fatal;

		var /** @type {number} */ Shift_JIS_lead = 0x00;

		this.handler = function(stream, bite) {
			if (bite === end_of_stream && Shift_JIS_lead !== 0x00) {
				Shift_JIS_lead = 0x00;
				return decoderError(fatal);
			}

			if (bite === end_of_stream && Shift_JIS_lead === 0x00)
				return finished;


			if (Shift_JIS_lead !== 0x00) {
				var lead = Shift_JIS_lead;
				var pointer = null;
				Shift_JIS_lead = 0x00;


				var offset = (bite < 0x7F) ? 0x40 : 0x41;


				var lead_offset = (lead < 0xA0) ? 0x81 : 0xC1;


				if (inRange(bite, 0x40, 0x7E) || inRange(bite, 0x80, 0xFC))
					pointer = (lead - lead_offset) * 188 + bite - offset;


				if (inRange(pointer, 8836, 10715))
					return 0xE000 - 8836 + pointer;


				var code_point = (pointer === null) ? null :
					indexCodePointFor(pointer, index('jis0208'));


				if (code_point === null && isASCIIByte(bite))
					stream.prepend(bite);


				if (code_point === null)
					return decoderError(fatal);

				return code_point;
			}


			if (isASCIIByte(bite) || bite === 0x80)
				return bite;


			if (inRange(bite, 0xA1, 0xDF))
				return 0xFF61 - 0xA1 + bite;


			if (inRange(bite, 0x81, 0x9F) || inRange(bite, 0xE0, 0xFC)) {
				Shift_JIS_lead = bite;
				return null;
			}

			return decoderError(fatal);
		};
	}

	/**
	 * @constructor
	 * @implements {Encoder}
	 * @param {{fatal: boolean}} options
	 */
	function ShiftJISEncoder(options) {
		var fatal = options.fatal;

		this.handler = function(stream, code_point) {
			if (code_point === end_of_stream)
				return finished;

			if (isASCIICodePoint(code_point) || code_point === 0x0080)
				return code_point;

			if (code_point === 0x00A5)
				return 0x5C;

			if (code_point === 0x203E)
				return 0x7E;


			if (inRange(code_point, 0xFF61, 0xFF9F))
				return code_point - 0xFF61 + 0xA1;


			if (code_point === 0x2212)
				code_point = 0xFF0D;

			var pointer = indexShiftJISPointerFor(code_point);

			if (pointer === null)
				return encoderError(code_point);


			var lead = floor(pointer / 188);


			var lead_offset = (lead < 0x1F) ? 0x81 : 0xC1;


			var trail = pointer % 188;


			var offset = (trail < 0x3F) ? 0x40 : 0x41;


			return [lead + lead_offset, trail + offset];
		};
	}

	/** @param {{fatal: boolean}} options */
	encoders['Shift_JIS'] = function(options) {
		return new ShiftJISEncoder(options);
	};
	/** @param {{fatal: boolean}} options */
	decoders['Shift_JIS'] = function(options) {
		return new ShiftJISDecoder(options);
	};

	/**
	 * @constructor
	 * @implements {Decoder}
	 * @param {{fatal: boolean}} options
	 */
	function EUCKRDecoder(options) {
		var fatal = options.fatal;


		var /** @type {number} */ euckr_lead = 0x00;

		this.handler = function(stream, bite) {

			if (bite === end_of_stream && euckr_lead !== 0) {
				euckr_lead = 0x00;
				return decoderError(fatal);
			}

			if (bite === end_of_stream && euckr_lead === 0)
				return finished;


			if (euckr_lead !== 0x00) {
				var lead = euckr_lead;
				var pointer = null;
				euckr_lead = 0x00;


				if (inRange(bite, 0x41, 0xFE))
					pointer = (lead - 0x81) * 190 + (bite - 0x41);


				var code_point = (pointer === null) ?
					null : indexCodePointFor(pointer, index('euc-kr'));

				if (pointer === null && isASCIIByte(bite))
					stream.prepend(bite);

				if (code_point === null)
					return decoderError(fatal);

				return code_point;
			}

			if (isASCIIByte(bite))
				return bite;


			if (inRange(bite, 0x81, 0xFE)) {
				euckr_lead = bite;
				return null;
			}

			return decoderError(fatal);
		};
	}


	/**
	 * @constructor
	 * @implements {Encoder}
	 * @param {{fatal: boolean}} options
	 */
	function EUCKREncoder(options) {
		var fatal = options.fatal;

		this.handler = function(stream, code_point) {
			if (code_point === end_of_stream)
				return finished;

			if (isASCIICodePoint(code_point))
				return code_point;


			var pointer = indexPointerFor(code_point, index('euc-kr'));


			if (pointer === null)
				return encoderError(code_point);

			var lead = floor(pointer / 190) + 0x81;


			var trail = (pointer % 190) + 0x41;


			return [lead, trail];
		};
	}

	/** @param {{fatal: boolean}} options */
	encoders['EUC-KR'] = function(options) {
		return new EUCKREncoder(options);
	};
	/** @param {{fatal: boolean}} options */
	decoders['EUC-KR'] = function(options) {
		return new EUCKRDecoder(options);
	};


	/**
	 * @param {number} code_unit
	 * @param {boolean} utf16be
	 * @return {!Array.<number>} bytes
	 */
	function convertCodeUnitToBytes(code_unit, utf16be) {
		var byte1 = code_unit >> 8;

		var byte2 = code_unit & 0x00FF;

		if (utf16be)
			return [byte1, byte2];

		return [byte2, byte1];
	}


	function UTF16Decoder(utf16_be, options) {
		var fatal = options.fatal;
		var /** @type {?number} */ utf16_lead_byte = null,
			/** @type {?number} */
			utf16_lead_surrogate = null;

		this.handler = function(stream, bite) {

			if (bite === end_of_stream && (utf16_lead_byte !== null ||
					utf16_lead_surrogate !== null)) {
				return decoderError(fatal);
			}

			if (bite === end_of_stream && utf16_lead_byte === null &&
				utf16_lead_surrogate === null) {
				return finished;
			}

			if (utf16_lead_byte === null) {
				utf16_lead_byte = bite;
				return null;
			}

			var code_unit;
			if (utf16_be) {
				code_unit = (utf16_lead_byte << 8) + bite;
			} else {
				code_unit = (bite << 8) + utf16_lead_byte;
			}
			utf16_lead_byte = null;
			if (utf16_lead_surrogate !== null) {
				var lead_surrogate = utf16_lead_surrogate;
				utf16_lead_surrogate = null;
				if (inRange(code_unit, 0xDC00, 0xDFFF)) {
					return 0x10000 + (lead_surrogate - 0xD800) * 0x400 +
						(code_unit - 0xDC00);
				}


				stream.prepend(convertCodeUnitToBytes(code_unit, utf16_be));
				return decoderError(fatal);
			}

			if (inRange(code_unit, 0xD800, 0xDBFF)) {
				utf16_lead_surrogate = code_unit;
				return null;
			}

			if (inRange(code_unit, 0xDC00, 0xDFFF))
				return decoderError(fatal);

			return code_unit;
		};
	}


	function UTF16Encoder(utf16_be, options) {
		var fatal = options.fatal;

		this.handler = function(stream, code_point) {
			if (code_point === end_of_stream)
				return finished;

			if (inRange(code_point, 0x0000, 0xFFFF))
				return convertCodeUnitToBytes(code_point, utf16_be);


			var lead = convertCodeUnitToBytes(
				((code_point - 0x10000) >> 10) + 0xD800, utf16_be);


			var trail = convertCodeUnitToBytes(
				((code_point - 0x10000) & 0x3FF) + 0xDC00, utf16_be);


			return lead.concat(trail);
		};
	}


	/** @param {{fatal: boolean}} options */
	encoders['UTF-16BE'] = function(options) {
		return new UTF16Encoder(true, options);
	};

	/** @param {{fatal: boolean}} options */
	decoders['UTF-16BE'] = function(options) {
		return new UTF16Decoder(true, options);
	};


	/** @param {{fatal: boolean}} options */
	encoders['UTF-16LE'] = function(options) {
		return new UTF16Encoder(false, options);
	};

	/** @param {{fatal: boolean}} options */
	decoders['UTF-16LE'] = function(options) {
		return new UTF16Decoder(false, options);
	};

	/**
	 * @constructor
	 * @implements {Decoder}
	 * @param {{fatal: boolean}} options
	 */
	function XUserDefinedDecoder(options) {
		var fatal = options.fatal;

		this.handler = function(stream, bite) {
			if (bite === end_of_stream)
				return finished;

			if (isASCIIByte(bite))
				return bite;

			return 0xF780 + bite - 0x80;
		};
	}


	/**
	 * @constructor
	 * @implements {Encoder}
	 * @param {{fatal: boolean}} options
	 */
	function XUserDefinedEncoder(options) {
		var fatal = options.fatal;

		this.handler = function(stream, code_point) {
			if (code_point === end_of_stream)
				return finished;

			if (isASCIICodePoint(code_point))
				return code_point;

			if (inRange(code_point, 0xF780, 0xF7FF))
				return code_point - 0xF780 + 0x80;

			return encoderError(code_point);
		};
	}

	/** @param {{fatal: boolean}} options */
	encoders['x-user-defined'] = function(options) {
		return new XUserDefinedEncoder(options);
	};
	/** @param {{fatal: boolean}} options */
	decoders['x-user-defined'] = function(options) {
		return new XUserDefinedDecoder(options);
	};

	if (!global['TextEncoder'])
		global['TextEncoder'] = TextEncoder;
	if (!global['TextDecoder'])
		global['TextDecoder'] = TextDecoder;
	if (!global['encode'])
		global['encode'] = encode;

	if (typeof module !== "undefined" && module.exports) {
		module.exports = {
			TextEncoder: global['TextEncoder'],
			TextDecoder: global['TextDecoder'],
			EncodingIndexes: global["encoding-indexes"]
		};
	}
}(this || {}));

export default {
	_this
}