2319 lines
65 KiB
JavaScript
2319 lines
65 KiB
JavaScript
/*!
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* Shim implementation of the TextEncoder, TextDecoder spec:
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* http://encoding.spec.whatwg.org/#interface-textencoder
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*
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* http://code.google.com/p/stringencoding/source/browse/encoding.js
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* 09b44d71759d on Sep 19, 2013
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* Used under Apache License 2.0 - http://code.google.com/p/stringencoding/
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*/
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(function(global) {
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'use strict';
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//
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// Utilities
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//
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/**
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* @param {number} a The number to test.
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* @param {number} min The minimum value in the range, inclusive.
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* @param {number} max The maximum value in the range, inclusive.
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* @return {boolean} True if a >= min and a <= max.
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*/
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function inRange(a, min, max) {
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return min <= a && a <= max;
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}
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/**
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* @param {number} n The numerator.
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* @param {number} d The denominator.
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* @return {number} The result of the integer division of n by d.
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*/
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function div(n, d) {
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return Math.floor(n / d);
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}
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//
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// Implementation of Encoding specification
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// http://dvcs.w3.org/hg/encoding/raw-file/tip/Overview.html
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//
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//
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// 3. Terminology
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//
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//
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// 4. Encodings
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//
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/** @const */ var EOF_byte = -1;
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/** @const */ var EOF_code_point = -1;
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/**
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* @constructor
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* @param {Uint8Array} bytes Array of bytes that provide the stream.
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*/
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function ByteInputStream(bytes) {
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/** @type {number} */
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var pos = 0;
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/** @return {number} Get the next byte from the stream. */
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this.get = function() {
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return (pos >= bytes.length) ? EOF_byte : Number(bytes[pos]);
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};
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/** @param {number} n Number (positive or negative) by which to
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* offset the byte pointer. */
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this.offset = function(n) {
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pos += n;
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if (pos < 0) {
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throw new Error('Seeking past start of the buffer');
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}
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if (pos > bytes.length) {
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throw new Error('Seeking past EOF');
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}
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};
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/**
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* @param {Array.<number>} test Array of bytes to compare against.
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* @return {boolean} True if the start of the stream matches the test
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* bytes.
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*/
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this.match = function(test) {
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if (test.length > pos + bytes.length) {
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return false;
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}
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var i;
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for (i = 0; i < test.length; i += 1) {
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if (Number(bytes[pos + i]) !== test[i]) {
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return false;
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}
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}
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return true;
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};
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}
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/**
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* @constructor
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* @param {Array.<number>} bytes The array to write bytes into.
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*/
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function ByteOutputStream(bytes) {
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/** @type {number} */
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var pos = 0;
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/**
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* @param {...number} var_args The byte or bytes to emit into the stream.
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* @return {number} The last byte emitted.
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*/
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this.emit = function(var_args) {
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/** @type {number} */
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var last = EOF_byte;
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var i;
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for (i = 0; i < arguments.length; ++i) {
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last = Number(arguments[i]);
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bytes[pos++] = last;
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}
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return last;
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};
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}
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/**
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* @constructor
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* @param {string} string The source of code units for the stream.
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*/
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function CodePointInputStream(string) {
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/**
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* @param {string} string Input string of UTF-16 code units.
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* @return {Array.<number>} Code points.
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*/
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function stringToCodePoints(string) {
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/** @type {Array.<number>} */
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var cps = [];
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// Based on http://www.w3.org/TR/WebIDL/#idl-DOMString
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var i = 0, n = string.length;
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while (i < string.length) {
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var c = string.charCodeAt(i);
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if (!inRange(c, 0xD800, 0xDFFF)) {
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cps.push(c);
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} else if (inRange(c, 0xDC00, 0xDFFF)) {
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cps.push(0xFFFD);
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} else { // (inRange(cu, 0xD800, 0xDBFF))
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if (i === n - 1) {
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cps.push(0xFFFD);
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} else {
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var d = string.charCodeAt(i + 1);
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if (inRange(d, 0xDC00, 0xDFFF)) {
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var a = c & 0x3FF;
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var b = d & 0x3FF;
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i += 1;
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cps.push(0x10000 + (a << 10) + b);
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} else {
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cps.push(0xFFFD);
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}
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}
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}
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i += 1;
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}
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return cps;
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}
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/** @type {number} */
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var pos = 0;
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/** @type {Array.<number>} */
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var cps = stringToCodePoints(string);
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/** @param {number} n The number of bytes (positive or negative)
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* to advance the code point pointer by.*/
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this.offset = function(n) {
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pos += n;
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if (pos < 0) {
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throw new Error('Seeking past start of the buffer');
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}
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if (pos > cps.length) {
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throw new Error('Seeking past EOF');
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}
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};
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/** @return {number} Get the next code point from the stream. */
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this.get = function() {
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if (pos >= cps.length) {
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return EOF_code_point;
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}
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return cps[pos];
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};
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}
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/**
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* @constructor
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*/
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function CodePointOutputStream() {
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/** @type {string} */
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var string = '';
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/** @return {string} The accumulated string. */
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this.string = function() {
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return string;
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};
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/** @param {number} c The code point to encode into the stream. */
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this.emit = function(c) {
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if (c <= 0xFFFF) {
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string += String.fromCharCode(c);
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} else {
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c -= 0x10000;
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string += String.fromCharCode(0xD800 + ((c >> 10) & 0x3ff));
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string += String.fromCharCode(0xDC00 + (c & 0x3ff));
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}
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};
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}
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/**
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* @constructor
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* @param {string} message Description of the error.
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*/
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function EncodingError(message) {
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this.name = 'EncodingError';
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this.message = message;
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this.code = 0;
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}
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EncodingError.prototype = Error.prototype;
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/**
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* @param {boolean} fatal If true, decoding errors raise an exception.
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* @param {number=} opt_code_point Override the standard fallback code point.
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* @return {number} The code point to insert on a decoding error.
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*/
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function decoderError(fatal, opt_code_point) {
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if (fatal) {
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throw new EncodingError('Decoder error');
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}
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return opt_code_point || 0xFFFD;
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}
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/**
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* @param {number} code_point The code point that could not be encoded.
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*/
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function encoderError(code_point) {
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throw new EncodingError('The code point ' + code_point +
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' could not be encoded.');
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}
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/**
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* @param {string} label The encoding label.
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* @return {?{name:string,labels:Array.<string>}}
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*/
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function getEncoding(label) {
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label = String(label).trim().toLowerCase();
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if (Object.prototype.hasOwnProperty.call(label_to_encoding, label)) {
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return label_to_encoding[label];
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}
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return null;
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}
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/** @type {Array.<{encodings: Array.<{name:string,labels:Array.<string>}>,
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* heading: string}>} */
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var encodings = [
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{
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"encodings": [
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{
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"labels": [
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"unicode-1-1-utf-8",
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"utf-8",
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"utf8"
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],
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"name": "utf-8"
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}
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],
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"heading": "The Encoding"
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},
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{
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"encodings": [
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{
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"labels": [
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"866",
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"cp866",
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"csibm866",
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"ibm866"
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],
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"name": "ibm866"
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},
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{
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"labels": [
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"csisolatin2",
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"iso-8859-2",
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"iso-ir-101",
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"iso8859-2",
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"iso88592",
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"iso_8859-2",
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"iso_8859-2:1987",
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"l2",
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"latin2"
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],
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"name": "iso-8859-2"
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},
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{
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"labels": [
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"csisolatin3",
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"iso-8859-3",
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"iso-ir-109",
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"iso8859-3",
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"iso88593",
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"iso_8859-3",
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"iso_8859-3:1988",
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"l3",
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"latin3"
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],
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"name": "iso-8859-3"
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},
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{
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"labels": [
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"csisolatin4",
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"iso-8859-4",
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"iso-ir-110",
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"iso8859-4",
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"iso88594",
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"iso_8859-4",
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"iso_8859-4:1988",
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"l4",
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"latin4"
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],
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"name": "iso-8859-4"
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},
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{
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"labels": [
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"csisolatincyrillic",
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"cyrillic",
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"iso-8859-5",
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"iso-ir-144",
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"iso8859-5",
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"iso88595",
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"iso_8859-5",
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"iso_8859-5:1988"
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],
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"name": "iso-8859-5"
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},
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{
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"labels": [
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"arabic",
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"asmo-708",
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"csiso88596e",
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"csiso88596i",
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"csisolatinarabic",
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"ecma-114",
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"iso-8859-6",
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"iso-8859-6-e",
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"iso-8859-6-i",
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"iso-ir-127",
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"iso8859-6",
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"iso88596",
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"iso_8859-6",
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"iso_8859-6:1987"
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],
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"name": "iso-8859-6"
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},
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{
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"labels": [
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"csisolatingreek",
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"ecma-118",
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"elot_928",
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"greek",
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"greek8",
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"iso-8859-7",
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"iso-ir-126",
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"iso8859-7",
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"iso88597",
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"iso_8859-7",
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"iso_8859-7:1987",
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"sun_eu_greek"
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],
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"name": "iso-8859-7"
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},
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{
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"labels": [
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"csiso88598e",
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"csisolatinhebrew",
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"hebrew",
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"iso-8859-8",
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"iso-8859-8-e",
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"iso-ir-138",
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"iso8859-8",
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"iso88598",
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"iso_8859-8",
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"iso_8859-8:1988",
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"visual"
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],
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"name": "iso-8859-8"
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},
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{
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"labels": [
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"csiso88598i",
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"iso-8859-8-i",
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"logical"
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],
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"name": "iso-8859-8-i"
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},
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{
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"labels": [
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"csisolatin6",
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"iso-8859-10",
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"iso-ir-157",
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"iso8859-10",
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"iso885910",
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"l6",
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"latin6"
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],
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"name": "iso-8859-10"
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},
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{
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"labels": [
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"iso-8859-13",
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"iso8859-13",
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"iso885913"
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],
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"name": "iso-8859-13"
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},
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{
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"labels": [
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"iso-8859-14",
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"iso8859-14",
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"iso885914"
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],
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"name": "iso-8859-14"
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},
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{
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"labels": [
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"csisolatin9",
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"iso-8859-15",
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"iso8859-15",
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"iso885915",
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"iso_8859-15",
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"l9"
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],
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"name": "iso-8859-15"
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},
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{
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"labels": [
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"iso-8859-16"
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],
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"name": "iso-8859-16"
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},
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{
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"labels": [
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"cskoi8r",
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"koi",
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"koi8",
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"koi8-r",
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"koi8_r"
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],
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"name": "koi8-r"
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},
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{
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"labels": [
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"koi8-u"
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],
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"name": "koi8-u"
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},
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{
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"labels": [
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"csmacintosh",
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"mac",
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"macintosh",
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"x-mac-roman"
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],
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"name": "macintosh"
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},
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{
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"labels": [
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"dos-874",
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"iso-8859-11",
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"iso8859-11",
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"iso885911",
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"tis-620",
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"windows-874"
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],
|
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"name": "windows-874"
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},
|
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{
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"labels": [
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"cp1250",
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"windows-1250",
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"x-cp1250"
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],
|
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"name": "windows-1250"
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},
|
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{
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"labels": [
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"cp1251",
|
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"windows-1251",
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"x-cp1251"
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],
|
|
"name": "windows-1251"
|
|
},
|
|
{
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"labels": [
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"ansi_x3.4-1968",
|
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"ascii",
|
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"cp1252",
|
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"cp819",
|
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"csisolatin1",
|
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"ibm819",
|
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"iso-8859-1",
|
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"iso-ir-100",
|
|
"iso8859-1",
|
|
"iso88591",
|
|
"iso_8859-1",
|
|
"iso_8859-1:1987",
|
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"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"
|
|
},
|
|
{
|
|
"labels": [
|
|
"hz-gb-2312"
|
|
],
|
|
"name": "hz-gb-2312"
|
|
}
|
|
],
|
|
"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",
|
|
"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",
|
|
"iso-2022-kr",
|
|
"iso-2022-cn",
|
|
"iso-2022-cn-ext"
|
|
],
|
|
"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"
|
|
}
|
|
];
|
|
|
|
var name_to_encoding = {};
|
|
var label_to_encoding = {};
|
|
encodings.forEach(function(category) {
|
|
category.encodings.forEach(function(encoding) {
|
|
name_to_encoding[encoding.name] = encoding;
|
|
encoding.labels.forEach(function(label) {
|
|
label_to_encoding[label] = encoding;
|
|
});
|
|
});
|
|
});
|
|
|
|
//
|
|
// 5. Indexes
|
|
//
|
|
|
|
/**
|
|
* @param {number} pointer The |pointer| to search for.
|
|
* @param {Array.<?number>} index The |index| to search within.
|
|
* @return {?number} The code point corresponding to |pointer| in |index|,
|
|
* or null if |code point| is not in |index|.
|
|
*/
|
|
function indexCodePointFor(pointer, index) {
|
|
return (index || [])[pointer] || null;
|
|
}
|
|
|
|
/**
|
|
* @param {number} code_point The |code point| to search for.
|
|
* @param {Array.<?number>} index The |index| to search within.
|
|
* @return {?number} The first pointer corresponding to |code point| in
|
|
* |index|, or null if |code point| is not in |index|.
|
|
*/
|
|
function indexPointerFor(code_point, index) {
|
|
var pointer = index.indexOf(code_point);
|
|
return pointer === -1 ? null : pointer;
|
|
}
|
|
|
|
/**
|
|
* @param {string} name Name of the index.
|
|
* @return {(Array.<number>|Array.<Array.<number>>)}
|
|
* */
|
|
function index(name) {
|
|
if (!('encoding-indexes' in global))
|
|
throw new Error("Indexes missing. Did you forget to include encoding-indexes.js?");
|
|
return global['encoding-indexes'][name];
|
|
}
|
|
|
|
/**
|
|
* @param {number} pointer The |pointer| to search for in the gb18030 index.
|
|
* @return {?number} The code point corresponding to |pointer| in |index|,
|
|
* or null if |code point| is not in the gb18030 index.
|
|
*/
|
|
function indexGB18030CodePointFor(pointer) {
|
|
if ((pointer > 39419 && pointer < 189000) || (pointer > 1237575)) {
|
|
return null;
|
|
}
|
|
var /** @type {number} */ offset = 0,
|
|
/** @type {number} */ code_point_offset = 0,
|
|
/** @type {Array.<Array.<number>>} */ idx = index('gb18030');
|
|
var i;
|
|
for (i = 0; i < idx.length; ++i) {
|
|
var entry = idx[i];
|
|
if (entry[0] <= pointer) {
|
|
offset = entry[0];
|
|
code_point_offset = entry[1];
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
return code_point_offset + pointer - offset;
|
|
}
|
|
|
|
/**
|
|
* @param {number} code_point The |code point| to locate in the gb18030 index.
|
|
* @return {number} The first pointer corresponding to |code point| in the
|
|
* gb18030 index.
|
|
*/
|
|
function indexGB18030PointerFor(code_point) {
|
|
var /** @type {number} */ offset = 0,
|
|
/** @type {number} */ pointer_offset = 0,
|
|
/** @type {Array.<Array.<number>>} */ idx = index('gb18030');
|
|
var i;
|
|
for (i = 0; i < idx.length; ++i) {
|
|
var entry = idx[i];
|
|
if (entry[1] <= code_point) {
|
|
offset = entry[1];
|
|
pointer_offset = entry[0];
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
return pointer_offset + code_point - offset;
|
|
}
|
|
|
|
//
|
|
// 7. The encoding
|
|
//
|
|
|
|
// 7.1 utf-8
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function UTF8Decoder(options) {
|
|
var fatal = options.fatal;
|
|
var /** @type {number} */ utf8_code_point = 0,
|
|
/** @type {number} */ utf8_bytes_needed = 0,
|
|
/** @type {number} */ utf8_bytes_seen = 0,
|
|
/** @type {number} */ utf8_lower_boundary = 0;
|
|
|
|
/**
|
|
* @param {ByteInputStream} byte_pointer The byte stream to decode.
|
|
* @return {?number} The next code point decoded, or null if not enough
|
|
* data exists in the input stream to decode a complete code point.
|
|
*/
|
|
this.decode = function(byte_pointer) {
|
|
var bite = byte_pointer.get();
|
|
if (bite === EOF_byte) {
|
|
if (utf8_bytes_needed !== 0) {
|
|
return decoderError(fatal);
|
|
}
|
|
return EOF_code_point;
|
|
}
|
|
byte_pointer.offset(1);
|
|
|
|
if (utf8_bytes_needed === 0) {
|
|
if (inRange(bite, 0x00, 0x7F)) {
|
|
return bite;
|
|
}
|
|
if (inRange(bite, 0xC2, 0xDF)) {
|
|
utf8_bytes_needed = 1;
|
|
utf8_lower_boundary = 0x80;
|
|
utf8_code_point = bite - 0xC0;
|
|
} else if (inRange(bite, 0xE0, 0xEF)) {
|
|
utf8_bytes_needed = 2;
|
|
utf8_lower_boundary = 0x800;
|
|
utf8_code_point = bite - 0xE0;
|
|
} else if (inRange(bite, 0xF0, 0xF4)) {
|
|
utf8_bytes_needed = 3;
|
|
utf8_lower_boundary = 0x10000;
|
|
utf8_code_point = bite - 0xF0;
|
|
} else {
|
|
return decoderError(fatal);
|
|
}
|
|
utf8_code_point = utf8_code_point * Math.pow(64, utf8_bytes_needed);
|
|
return null;
|
|
}
|
|
if (!inRange(bite, 0x80, 0xBF)) {
|
|
utf8_code_point = 0;
|
|
utf8_bytes_needed = 0;
|
|
utf8_bytes_seen = 0;
|
|
utf8_lower_boundary = 0;
|
|
byte_pointer.offset(-1);
|
|
return decoderError(fatal);
|
|
}
|
|
utf8_bytes_seen += 1;
|
|
utf8_code_point = utf8_code_point + (bite - 0x80) *
|
|
Math.pow(64, utf8_bytes_needed - utf8_bytes_seen);
|
|
if (utf8_bytes_seen !== utf8_bytes_needed) {
|
|
return null;
|
|
}
|
|
var code_point = utf8_code_point;
|
|
var lower_boundary = utf8_lower_boundary;
|
|
utf8_code_point = 0;
|
|
utf8_bytes_needed = 0;
|
|
utf8_bytes_seen = 0;
|
|
utf8_lower_boundary = 0;
|
|
if (inRange(code_point, lower_boundary, 0x10FFFF) &&
|
|
!inRange(code_point, 0xD800, 0xDFFF)) {
|
|
return code_point;
|
|
}
|
|
return decoderError(fatal);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function UTF8Encoder(options) {
|
|
var fatal = options.fatal;
|
|
/**
|
|
* @param {ByteOutputStream} output_byte_stream Output byte stream.
|
|
* @param {CodePointInputStream} code_point_pointer Input stream.
|
|
* @return {number} The last byte emitted.
|
|
*/
|
|
this.encode = function(output_byte_stream, code_point_pointer) {
|
|
var code_point = code_point_pointer.get();
|
|
if (code_point === EOF_code_point) {
|
|
return EOF_byte;
|
|
}
|
|
code_point_pointer.offset(1);
|
|
if (inRange(code_point, 0xD800, 0xDFFF)) {
|
|
return encoderError(code_point);
|
|
}
|
|
if (inRange(code_point, 0x0000, 0x007f)) {
|
|
return output_byte_stream.emit(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 result = output_byte_stream.emit(
|
|
div(code_point, Math.pow(64, count)) + offset);
|
|
while (count > 0) {
|
|
var temp = div(code_point, Math.pow(64, count - 1));
|
|
result = output_byte_stream.emit(0x80 + (temp % 64));
|
|
count -= 1;
|
|
}
|
|
return result;
|
|
};
|
|
}
|
|
|
|
name_to_encoding['utf-8'].getEncoder = function(options) {
|
|
return new UTF8Encoder(options);
|
|
};
|
|
name_to_encoding['utf-8'].getDecoder = function(options) {
|
|
return new UTF8Decoder(options);
|
|
};
|
|
|
|
//
|
|
// 8. Legacy single-byte encodings
|
|
//
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {Array.<number>} index The encoding index.
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function SingleByteDecoder(index, options) {
|
|
var fatal = options.fatal;
|
|
/**
|
|
* @param {ByteInputStream} byte_pointer The byte stream to decode.
|
|
* @return {?number} The next code point decoded, or null if not enough
|
|
* data exists in the input stream to decode a complete code point.
|
|
*/
|
|
this.decode = function(byte_pointer) {
|
|
var bite = byte_pointer.get();
|
|
if (bite === EOF_byte) {
|
|
return EOF_code_point;
|
|
}
|
|
byte_pointer.offset(1);
|
|
if (inRange(bite, 0x00, 0x7F)) {
|
|
return bite;
|
|
}
|
|
var code_point = index[bite - 0x80];
|
|
if (code_point === null) {
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {Array.<?number>} index The encoding index.
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function SingleByteEncoder(index, options) {
|
|
var fatal = options.fatal;
|
|
/**
|
|
* @param {ByteOutputStream} output_byte_stream Output byte stream.
|
|
* @param {CodePointInputStream} code_point_pointer Input stream.
|
|
* @return {number} The last byte emitted.
|
|
*/
|
|
this.encode = function(output_byte_stream, code_point_pointer) {
|
|
var code_point = code_point_pointer.get();
|
|
if (code_point === EOF_code_point) {
|
|
return EOF_byte;
|
|
}
|
|
code_point_pointer.offset(1);
|
|
if (inRange(code_point, 0x0000, 0x007F)) {
|
|
return output_byte_stream.emit(code_point);
|
|
}
|
|
var pointer = indexPointerFor(code_point, index);
|
|
if (pointer === null) {
|
|
encoderError(code_point);
|
|
}
|
|
return output_byte_stream.emit(pointer + 0x80);
|
|
};
|
|
}
|
|
|
|
(function() {
|
|
encodings.forEach(function(category) {
|
|
if (category.heading !== 'Legacy single-byte encodings')
|
|
return;
|
|
category.encodings.forEach(function(encoding) {
|
|
var idx = index(encoding.name);
|
|
encoding.getDecoder = function(options) {
|
|
return new SingleByteDecoder(idx, options);
|
|
};
|
|
encoding.getEncoder = function(options) {
|
|
return new SingleByteEncoder(idx, options);
|
|
};
|
|
});
|
|
});
|
|
}());
|
|
|
|
//
|
|
// 9. Legacy multi-byte Chinese (simplified) encodings
|
|
//
|
|
|
|
// 9.1 gbk
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {boolean} gb18030 True if decoding gb18030, false otherwise.
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function GBKDecoder(gb18030, options) {
|
|
var fatal = options.fatal;
|
|
var /** @type {number} */ gbk_first = 0x00,
|
|
/** @type {number} */ gbk_second = 0x00,
|
|
/** @type {number} */ gbk_third = 0x00;
|
|
/**
|
|
* @param {ByteInputStream} byte_pointer The byte stream to decode.
|
|
* @return {?number} The next code point decoded, or null if not enough
|
|
* data exists in the input stream to decode a complete code point.
|
|
*/
|
|
this.decode = function(byte_pointer) {
|
|
var bite = byte_pointer.get();
|
|
if (bite === EOF_byte && gbk_first === 0x00 &&
|
|
gbk_second === 0x00 && gbk_third === 0x00) {
|
|
return EOF_code_point;
|
|
}
|
|
if (bite === EOF_byte &&
|
|
(gbk_first !== 0x00 || gbk_second !== 0x00 || gbk_third !== 0x00)) {
|
|
gbk_first = 0x00;
|
|
gbk_second = 0x00;
|
|
gbk_third = 0x00;
|
|
decoderError(fatal);
|
|
}
|
|
byte_pointer.offset(1);
|
|
var code_point;
|
|
if (gbk_third !== 0x00) {
|
|
code_point = null;
|
|
if (inRange(bite, 0x30, 0x39)) {
|
|
code_point = indexGB18030CodePointFor(
|
|
(((gbk_first - 0x81) * 10 + (gbk_second - 0x30)) * 126 +
|
|
(gbk_third - 0x81)) * 10 + bite - 0x30);
|
|
}
|
|
gbk_first = 0x00;
|
|
gbk_second = 0x00;
|
|
gbk_third = 0x00;
|
|
if (code_point === null) {
|
|
byte_pointer.offset(-3);
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
}
|
|
if (gbk_second !== 0x00) {
|
|
if (inRange(bite, 0x81, 0xFE)) {
|
|
gbk_third = bite;
|
|
return null;
|
|
}
|
|
byte_pointer.offset(-2);
|
|
gbk_first = 0x00;
|
|
gbk_second = 0x00;
|
|
return decoderError(fatal);
|
|
}
|
|
if (gbk_first !== 0x00) {
|
|
if (inRange(bite, 0x30, 0x39) && gb18030) {
|
|
gbk_second = bite;
|
|
return null;
|
|
}
|
|
var lead = gbk_first;
|
|
var pointer = null;
|
|
gbk_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('gbk'));
|
|
if (pointer === null) {
|
|
byte_pointer.offset(-1);
|
|
}
|
|
if (code_point === null) {
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
}
|
|
if (inRange(bite, 0x00, 0x7F)) {
|
|
return bite;
|
|
}
|
|
if (bite === 0x80) {
|
|
return 0x20AC;
|
|
}
|
|
if (inRange(bite, 0x81, 0xFE)) {
|
|
gbk_first = bite;
|
|
return null;
|
|
}
|
|
return decoderError(fatal);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {boolean} gb18030 True if decoding gb18030, false otherwise.
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function GBKEncoder(gb18030, options) {
|
|
var fatal = options.fatal;
|
|
/**
|
|
* @param {ByteOutputStream} output_byte_stream Output byte stream.
|
|
* @param {CodePointInputStream} code_point_pointer Input stream.
|
|
* @return {number} The last byte emitted.
|
|
*/
|
|
this.encode = function(output_byte_stream, code_point_pointer) {
|
|
var code_point = code_point_pointer.get();
|
|
if (code_point === EOF_code_point) {
|
|
return EOF_byte;
|
|
}
|
|
code_point_pointer.offset(1);
|
|
if (inRange(code_point, 0x0000, 0x007F)) {
|
|
return output_byte_stream.emit(code_point);
|
|
}
|
|
var pointer = indexPointerFor(code_point, index('gbk'));
|
|
if (pointer !== null) {
|
|
var lead = div(pointer, 190) + 0x81;
|
|
var trail = pointer % 190;
|
|
var offset = trail < 0x3F ? 0x40 : 0x41;
|
|
return output_byte_stream.emit(lead, trail + offset);
|
|
}
|
|
if (pointer === null && !gb18030) {
|
|
return encoderError(code_point);
|
|
}
|
|
pointer = indexGB18030PointerFor(code_point);
|
|
var byte1 = div(div(div(pointer, 10), 126), 10);
|
|
pointer = pointer - byte1 * 10 * 126 * 10;
|
|
var byte2 = div(div(pointer, 10), 126);
|
|
pointer = pointer - byte2 * 10 * 126;
|
|
var byte3 = div(pointer, 10);
|
|
var byte4 = pointer - byte3 * 10;
|
|
return output_byte_stream.emit(byte1 + 0x81,
|
|
byte2 + 0x30,
|
|
byte3 + 0x81,
|
|
byte4 + 0x30);
|
|
};
|
|
}
|
|
|
|
name_to_encoding['gbk'].getEncoder = function(options) {
|
|
return new GBKEncoder(false, options);
|
|
};
|
|
name_to_encoding['gbk'].getDecoder = function(options) {
|
|
return new GBKDecoder(false, options);
|
|
};
|
|
|
|
// 9.2 gb18030
|
|
name_to_encoding['gb18030'].getEncoder = function(options) {
|
|
return new GBKEncoder(true, options);
|
|
};
|
|
name_to_encoding['gb18030'].getDecoder = function(options) {
|
|
return new GBKDecoder(true, options);
|
|
};
|
|
|
|
// 9.3 hz-gb-2312
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function HZGB2312Decoder(options) {
|
|
var fatal = options.fatal;
|
|
var /** @type {boolean} */ hzgb2312 = false,
|
|
/** @type {number} */ hzgb2312_lead = 0x00;
|
|
/**
|
|
* @param {ByteInputStream} byte_pointer The byte stream to decode.
|
|
* @return {?number} The next code point decoded, or null if not enough
|
|
* data exists in the input stream to decode a complete code point.
|
|
*/
|
|
this.decode = function(byte_pointer) {
|
|
var bite = byte_pointer.get();
|
|
if (bite === EOF_byte && hzgb2312_lead === 0x00) {
|
|
return EOF_code_point;
|
|
}
|
|
if (bite === EOF_byte && hzgb2312_lead !== 0x00) {
|
|
hzgb2312_lead = 0x00;
|
|
return decoderError(fatal);
|
|
}
|
|
byte_pointer.offset(1);
|
|
if (hzgb2312_lead === 0x7E) {
|
|
hzgb2312_lead = 0x00;
|
|
if (bite === 0x7B) {
|
|
hzgb2312 = true;
|
|
return null;
|
|
}
|
|
if (bite === 0x7D) {
|
|
hzgb2312 = false;
|
|
return null;
|
|
}
|
|
if (bite === 0x7E) {
|
|
return 0x007E;
|
|
}
|
|
if (bite === 0x0A) {
|
|
return null;
|
|
}
|
|
byte_pointer.offset(-1);
|
|
return decoderError(fatal);
|
|
}
|
|
if (hzgb2312_lead !== 0x00) {
|
|
var lead = hzgb2312_lead;
|
|
hzgb2312_lead = 0x00;
|
|
var code_point = null;
|
|
if (inRange(bite, 0x21, 0x7E)) {
|
|
code_point = indexCodePointFor((lead - 1) * 190 +
|
|
(bite + 0x3F), index('gbk'));
|
|
}
|
|
if (bite === 0x0A) {
|
|
hzgb2312 = false;
|
|
}
|
|
if (code_point === null) {
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
}
|
|
if (bite === 0x7E) {
|
|
hzgb2312_lead = 0x7E;
|
|
return null;
|
|
}
|
|
if (hzgb2312) {
|
|
if (inRange(bite, 0x20, 0x7F)) {
|
|
hzgb2312_lead = bite;
|
|
return null;
|
|
}
|
|
if (bite === 0x0A) {
|
|
hzgb2312 = false;
|
|
}
|
|
return decoderError(fatal);
|
|
}
|
|
if (inRange(bite, 0x00, 0x7F)) {
|
|
return bite;
|
|
}
|
|
return decoderError(fatal);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function HZGB2312Encoder(options) {
|
|
var fatal = options.fatal;
|
|
var hzgb2312 = false;
|
|
/**
|
|
* @param {ByteOutputStream} output_byte_stream Output byte stream.
|
|
* @param {CodePointInputStream} code_point_pointer Input stream.
|
|
* @return {number} The last byte emitted.
|
|
*/
|
|
this.encode = function(output_byte_stream, code_point_pointer) {
|
|
var code_point = code_point_pointer.get();
|
|
if (code_point === EOF_code_point) {
|
|
return EOF_byte;
|
|
}
|
|
code_point_pointer.offset(1);
|
|
if (inRange(code_point, 0x0000, 0x007F) && hzgb2312) {
|
|
code_point_pointer.offset(-1);
|
|
hzgb2312 = false;
|
|
return output_byte_stream.emit(0x7E, 0x7D);
|
|
}
|
|
if (code_point === 0x007E) {
|
|
return output_byte_stream.emit(0x7E, 0x7E);
|
|
}
|
|
if (inRange(code_point, 0x0000, 0x007F)) {
|
|
return output_byte_stream.emit(code_point);
|
|
}
|
|
if (!hzgb2312) {
|
|
code_point_pointer.offset(-1);
|
|
hzgb2312 = true;
|
|
return output_byte_stream.emit(0x7E, 0x7B);
|
|
}
|
|
var pointer = indexPointerFor(code_point, index('gbk'));
|
|
if (pointer === null) {
|
|
return encoderError(code_point);
|
|
}
|
|
var lead = div(pointer, 190) + 1;
|
|
var trail = pointer % 190 - 0x3F;
|
|
if (!inRange(lead, 0x21, 0x7E) || !inRange(trail, 0x21, 0x7E)) {
|
|
return encoderError(code_point);
|
|
}
|
|
return output_byte_stream.emit(lead, trail);
|
|
};
|
|
}
|
|
|
|
name_to_encoding['hz-gb-2312'].getEncoder = function(options) {
|
|
return new HZGB2312Encoder(options);
|
|
};
|
|
name_to_encoding['hz-gb-2312'].getDecoder = function(options) {
|
|
return new HZGB2312Decoder(options);
|
|
};
|
|
|
|
//
|
|
// 10. Legacy multi-byte Chinese (traditional) encodings
|
|
//
|
|
|
|
// 10.1 big5
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function Big5Decoder(options) {
|
|
var fatal = options.fatal;
|
|
var /** @type {number} */ big5_lead = 0x00,
|
|
/** @type {?number} */ big5_pending = null;
|
|
|
|
/**
|
|
* @param {ByteInputStream} byte_pointer The byte steram to decode.
|
|
* @return {?number} The next code point decoded, or null if not enough
|
|
* data exists in the input stream to decode a complete code point.
|
|
*/
|
|
this.decode = function(byte_pointer) {
|
|
// NOTE: Hack to support emitting two code points
|
|
if (big5_pending !== null) {
|
|
var pending = big5_pending;
|
|
big5_pending = null;
|
|
return pending;
|
|
}
|
|
var bite = byte_pointer.get();
|
|
if (bite === EOF_byte && big5_lead === 0x00) {
|
|
return EOF_code_point;
|
|
}
|
|
if (bite === EOF_byte && big5_lead !== 0x00) {
|
|
big5_lead = 0x00;
|
|
return decoderError(fatal);
|
|
}
|
|
byte_pointer.offset(1);
|
|
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);
|
|
}
|
|
if (pointer === 1133) {
|
|
big5_pending = 0x0304;
|
|
return 0x00CA;
|
|
}
|
|
if (pointer === 1135) {
|
|
big5_pending = 0x030C;
|
|
return 0x00CA;
|
|
}
|
|
if (pointer === 1164) {
|
|
big5_pending = 0x0304;
|
|
return 0x00EA;
|
|
}
|
|
if (pointer === 1166) {
|
|
big5_pending = 0x030C;
|
|
return 0x00EA;
|
|
}
|
|
var code_point = (pointer === null) ? null :
|
|
indexCodePointFor(pointer, index('big5'));
|
|
if (pointer === null) {
|
|
byte_pointer.offset(-1);
|
|
}
|
|
if (code_point === null) {
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
}
|
|
if (inRange(bite, 0x00, 0x7F)) {
|
|
return bite;
|
|
}
|
|
if (inRange(bite, 0x81, 0xFE)) {
|
|
big5_lead = bite;
|
|
return null;
|
|
}
|
|
return decoderError(fatal);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function Big5Encoder(options) {
|
|
var fatal = options.fatal;
|
|
/**
|
|
* @param {ByteOutputStream} output_byte_stream Output byte stream.
|
|
* @param {CodePointInputStream} code_point_pointer Input stream.
|
|
* @return {number} The last byte emitted.
|
|
*/
|
|
this.encode = function(output_byte_stream, code_point_pointer) {
|
|
var code_point = code_point_pointer.get();
|
|
if (code_point === EOF_code_point) {
|
|
return EOF_byte;
|
|
}
|
|
code_point_pointer.offset(1);
|
|
if (inRange(code_point, 0x0000, 0x007F)) {
|
|
return output_byte_stream.emit(code_point);
|
|
}
|
|
var pointer = indexPointerFor(code_point, index('big5'));
|
|
if (pointer === null) {
|
|
return encoderError(code_point);
|
|
}
|
|
var lead = div(pointer, 157) + 0x81;
|
|
//if (lead < 0xA1) {
|
|
// return encoderError(code_point);
|
|
//}
|
|
var trail = pointer % 157;
|
|
var offset = trail < 0x3F ? 0x40 : 0x62;
|
|
return output_byte_stream.emit(lead, trail + offset);
|
|
};
|
|
}
|
|
|
|
name_to_encoding['big5'].getEncoder = function(options) {
|
|
return new Big5Encoder(options);
|
|
};
|
|
name_to_encoding['big5'].getDecoder = function(options) {
|
|
return new Big5Decoder(options);
|
|
};
|
|
|
|
|
|
//
|
|
// 11. Legacy multi-byte Japanese encodings
|
|
//
|
|
|
|
// 11.1 euc.jp
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function EUCJPDecoder(options) {
|
|
var fatal = options.fatal;
|
|
var /** @type {number} */ eucjp_first = 0x00,
|
|
/** @type {number} */ eucjp_second = 0x00;
|
|
/**
|
|
* @param {ByteInputStream} byte_pointer The byte stream to decode.
|
|
* @return {?number} The next code point decoded, or null if not enough
|
|
* data exists in the input stream to decode a complete code point.
|
|
*/
|
|
this.decode = function(byte_pointer) {
|
|
var bite = byte_pointer.get();
|
|
if (bite === EOF_byte) {
|
|
if (eucjp_first === 0x00 && eucjp_second === 0x00) {
|
|
return EOF_code_point;
|
|
}
|
|
eucjp_first = 0x00;
|
|
eucjp_second = 0x00;
|
|
return decoderError(fatal);
|
|
}
|
|
byte_pointer.offset(1);
|
|
|
|
var lead, code_point;
|
|
if (eucjp_second !== 0x00) {
|
|
lead = eucjp_second;
|
|
eucjp_second = 0x00;
|
|
code_point = null;
|
|
if (inRange(lead, 0xA1, 0xFE) && inRange(bite, 0xA1, 0xFE)) {
|
|
code_point = indexCodePointFor((lead - 0xA1) * 94 + bite - 0xA1,
|
|
index('jis0212'));
|
|
}
|
|
if (!inRange(bite, 0xA1, 0xFE)) {
|
|
byte_pointer.offset(-1);
|
|
}
|
|
if (code_point === null) {
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
}
|
|
if (eucjp_first === 0x8E && inRange(bite, 0xA1, 0xDF)) {
|
|
eucjp_first = 0x00;
|
|
return 0xFF61 + bite - 0xA1;
|
|
}
|
|
if (eucjp_first === 0x8F && inRange(bite, 0xA1, 0xFE)) {
|
|
eucjp_first = 0x00;
|
|
eucjp_second = bite;
|
|
return null;
|
|
}
|
|
if (eucjp_first !== 0x00) {
|
|
lead = eucjp_first;
|
|
eucjp_first = 0x00;
|
|
code_point = null;
|
|
if (inRange(lead, 0xA1, 0xFE) && inRange(bite, 0xA1, 0xFE)) {
|
|
code_point = indexCodePointFor((lead - 0xA1) * 94 + bite - 0xA1,
|
|
index('jis0208'));
|
|
}
|
|
if (!inRange(bite, 0xA1, 0xFE)) {
|
|
byte_pointer.offset(-1);
|
|
}
|
|
if (code_point === null) {
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
}
|
|
if (inRange(bite, 0x00, 0x7F)) {
|
|
return bite;
|
|
}
|
|
if (bite === 0x8E || bite === 0x8F || (inRange(bite, 0xA1, 0xFE))) {
|
|
eucjp_first = bite;
|
|
return null;
|
|
}
|
|
return decoderError(fatal);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function EUCJPEncoder(options) {
|
|
var fatal = options.fatal;
|
|
/**
|
|
* @param {ByteOutputStream} output_byte_stream Output byte stream.
|
|
* @param {CodePointInputStream} code_point_pointer Input stream.
|
|
* @return {number} The last byte emitted.
|
|
*/
|
|
this.encode = function(output_byte_stream, code_point_pointer) {
|
|
var code_point = code_point_pointer.get();
|
|
if (code_point === EOF_code_point) {
|
|
return EOF_byte;
|
|
}
|
|
code_point_pointer.offset(1);
|
|
if (inRange(code_point, 0x0000, 0x007F)) {
|
|
return output_byte_stream.emit(code_point);
|
|
}
|
|
if (code_point === 0x00A5) {
|
|
return output_byte_stream.emit(0x5C);
|
|
}
|
|
if (code_point === 0x203E) {
|
|
return output_byte_stream.emit(0x7E);
|
|
}
|
|
if (inRange(code_point, 0xFF61, 0xFF9F)) {
|
|
return output_byte_stream.emit(0x8E, code_point - 0xFF61 + 0xA1);
|
|
}
|
|
|
|
var pointer = indexPointerFor(code_point, index('jis0208'));
|
|
if (pointer === null) {
|
|
return encoderError(code_point);
|
|
}
|
|
var lead = div(pointer, 94) + 0xA1;
|
|
var trail = pointer % 94 + 0xA1;
|
|
return output_byte_stream.emit(lead, trail);
|
|
};
|
|
}
|
|
|
|
name_to_encoding['euc-jp'].getEncoder = function(options) {
|
|
return new EUCJPEncoder(options);
|
|
};
|
|
name_to_encoding['euc-jp'].getDecoder = function(options) {
|
|
return new EUCJPDecoder(options);
|
|
};
|
|
|
|
// 11.2 iso-2022-jp
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function ISO2022JPDecoder(options) {
|
|
var fatal = options.fatal;
|
|
/** @enum */
|
|
var state = {
|
|
ASCII: 0,
|
|
escape_start: 1,
|
|
escape_middle: 2,
|
|
escape_final: 3,
|
|
lead: 4,
|
|
trail: 5,
|
|
Katakana: 6
|
|
};
|
|
var /** @type {number} */ iso2022jp_state = state.ASCII,
|
|
/** @type {boolean} */ iso2022jp_jis0212 = false,
|
|
/** @type {number} */ iso2022jp_lead = 0x00;
|
|
/**
|
|
* @param {ByteInputStream} byte_pointer The byte stream to decode.
|
|
* @return {?number} The next code point decoded, or null if not enough
|
|
* data exists in the input stream to decode a complete code point.
|
|
*/
|
|
this.decode = function(byte_pointer) {
|
|
var bite = byte_pointer.get();
|
|
if (bite !== EOF_byte) {
|
|
byte_pointer.offset(1);
|
|
}
|
|
switch (iso2022jp_state) {
|
|
default:
|
|
case state.ASCII:
|
|
if (bite === 0x1B) {
|
|
iso2022jp_state = state.escape_start;
|
|
return null;
|
|
}
|
|
if (inRange(bite, 0x00, 0x7F)) {
|
|
return bite;
|
|
}
|
|
if (bite === EOF_byte) {
|
|
return EOF_code_point;
|
|
}
|
|
return decoderError(fatal);
|
|
|
|
case state.escape_start:
|
|
if (bite === 0x24 || bite === 0x28) {
|
|
iso2022jp_lead = bite;
|
|
iso2022jp_state = state.escape_middle;
|
|
return null;
|
|
}
|
|
if (bite !== EOF_byte) {
|
|
byte_pointer.offset(-1);
|
|
}
|
|
iso2022jp_state = state.ASCII;
|
|
return decoderError(fatal);
|
|
|
|
case state.escape_middle:
|
|
var lead = iso2022jp_lead;
|
|
iso2022jp_lead = 0x00;
|
|
if (lead === 0x24 && (bite === 0x40 || bite === 0x42)) {
|
|
iso2022jp_jis0212 = false;
|
|
iso2022jp_state = state.lead;
|
|
return null;
|
|
}
|
|
if (lead === 0x24 && bite === 0x28) {
|
|
iso2022jp_state = state.escape_final;
|
|
return null;
|
|
}
|
|
if (lead === 0x28 && (bite === 0x42 || bite === 0x4A)) {
|
|
iso2022jp_state = state.ASCII;
|
|
return null;
|
|
}
|
|
if (lead === 0x28 && bite === 0x49) {
|
|
iso2022jp_state = state.Katakana;
|
|
return null;
|
|
}
|
|
if (bite === EOF_byte) {
|
|
byte_pointer.offset(-1);
|
|
} else {
|
|
byte_pointer.offset(-2);
|
|
}
|
|
iso2022jp_state = state.ASCII;
|
|
return decoderError(fatal);
|
|
|
|
case state.escape_final:
|
|
if (bite === 0x44) {
|
|
iso2022jp_jis0212 = true;
|
|
iso2022jp_state = state.lead;
|
|
return null;
|
|
}
|
|
if (bite === EOF_byte) {
|
|
byte_pointer.offset(-2);
|
|
} else {
|
|
byte_pointer.offset(-3);
|
|
}
|
|
iso2022jp_state = state.ASCII;
|
|
return decoderError(fatal);
|
|
|
|
case state.lead:
|
|
if (bite === 0x0A) {
|
|
iso2022jp_state = state.ASCII;
|
|
return decoderError(fatal, 0x000A);
|
|
}
|
|
if (bite === 0x1B) {
|
|
iso2022jp_state = state.escape_start;
|
|
return null;
|
|
}
|
|
if (bite === EOF_byte) {
|
|
return EOF_code_point;
|
|
}
|
|
iso2022jp_lead = bite;
|
|
iso2022jp_state = state.trail;
|
|
return null;
|
|
|
|
case state.trail:
|
|
iso2022jp_state = state.lead;
|
|
if (bite === EOF_byte) {
|
|
return decoderError(fatal);
|
|
}
|
|
var code_point = null;
|
|
var pointer = (iso2022jp_lead - 0x21) * 94 + bite - 0x21;
|
|
if (inRange(iso2022jp_lead, 0x21, 0x7E) &&
|
|
inRange(bite, 0x21, 0x7E)) {
|
|
code_point = (iso2022jp_jis0212 === false) ?
|
|
indexCodePointFor(pointer, index('jis0208')) :
|
|
indexCodePointFor(pointer, index('jis0212'));
|
|
}
|
|
if (code_point === null) {
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
|
|
case state.Katakana:
|
|
if (bite === 0x1B) {
|
|
iso2022jp_state = state.escape_start;
|
|
return null;
|
|
}
|
|
if (inRange(bite, 0x21, 0x5F)) {
|
|
return 0xFF61 + bite - 0x21;
|
|
}
|
|
if (bite === EOF_byte) {
|
|
return EOF_code_point;
|
|
}
|
|
return decoderError(fatal);
|
|
}
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function ISO2022JPEncoder(options) {
|
|
var fatal = options.fatal;
|
|
/** @enum */
|
|
var state = {
|
|
ASCII: 0,
|
|
lead: 1,
|
|
Katakana: 2
|
|
};
|
|
var /** @type {number} */ iso2022jp_state = state.ASCII;
|
|
/**
|
|
* @param {ByteOutputStream} output_byte_stream Output byte stream.
|
|
* @param {CodePointInputStream} code_point_pointer Input stream.
|
|
* @return {number} The last byte emitted.
|
|
*/
|
|
this.encode = function(output_byte_stream, code_point_pointer) {
|
|
var code_point = code_point_pointer.get();
|
|
if (code_point === EOF_code_point) {
|
|
return EOF_byte;
|
|
}
|
|
code_point_pointer.offset(1);
|
|
if ((inRange(code_point, 0x0000, 0x007F) ||
|
|
code_point === 0x00A5 || code_point === 0x203E) &&
|
|
iso2022jp_state !== state.ASCII) {
|
|
code_point_pointer.offset(-1);
|
|
iso2022jp_state = state.ASCII;
|
|
return output_byte_stream.emit(0x1B, 0x28, 0x42);
|
|
}
|
|
if (inRange(code_point, 0x0000, 0x007F)) {
|
|
return output_byte_stream.emit(code_point);
|
|
}
|
|
if (code_point === 0x00A5) {
|
|
return output_byte_stream.emit(0x5C);
|
|
}
|
|
if (code_point === 0x203E) {
|
|
return output_byte_stream.emit(0x7E);
|
|
}
|
|
if (inRange(code_point, 0xFF61, 0xFF9F) &&
|
|
iso2022jp_state !== state.Katakana) {
|
|
code_point_pointer.offset(-1);
|
|
iso2022jp_state = state.Katakana;
|
|
return output_byte_stream.emit(0x1B, 0x28, 0x49);
|
|
}
|
|
if (inRange(code_point, 0xFF61, 0xFF9F)) {
|
|
return output_byte_stream.emit(code_point - 0xFF61 - 0x21);
|
|
}
|
|
if (iso2022jp_state !== state.lead) {
|
|
code_point_pointer.offset(-1);
|
|
iso2022jp_state = state.lead;
|
|
return output_byte_stream.emit(0x1B, 0x24, 0x42);
|
|
}
|
|
var pointer = indexPointerFor(code_point, index('jis0208'));
|
|
if (pointer === null) {
|
|
return encoderError(code_point);
|
|
}
|
|
var lead = div(pointer, 94) + 0x21;
|
|
var trail = pointer % 94 + 0x21;
|
|
return output_byte_stream.emit(lead, trail);
|
|
};
|
|
}
|
|
|
|
name_to_encoding['iso-2022-jp'].getEncoder = function(options) {
|
|
return new ISO2022JPEncoder(options);
|
|
};
|
|
name_to_encoding['iso-2022-jp'].getDecoder = function(options) {
|
|
return new ISO2022JPDecoder(options);
|
|
};
|
|
|
|
// 11.3 shift_jis
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function ShiftJISDecoder(options) {
|
|
var fatal = options.fatal;
|
|
var /** @type {number} */ shiftjis_lead = 0x00;
|
|
/**
|
|
* @param {ByteInputStream} byte_pointer The byte stream to decode.
|
|
* @return {?number} The next code point decoded, or null if not enough
|
|
* data exists in the input stream to decode a complete code point.
|
|
*/
|
|
this.decode = function(byte_pointer) {
|
|
var bite = byte_pointer.get();
|
|
if (bite === EOF_byte && shiftjis_lead === 0x00) {
|
|
return EOF_code_point;
|
|
}
|
|
if (bite === EOF_byte && shiftjis_lead !== 0x00) {
|
|
shiftjis_lead = 0x00;
|
|
return decoderError(fatal);
|
|
}
|
|
byte_pointer.offset(1);
|
|
if (shiftjis_lead !== 0x00) {
|
|
var lead = shiftjis_lead;
|
|
shiftjis_lead = 0x00;
|
|
if (inRange(bite, 0x40, 0x7E) || inRange(bite, 0x80, 0xFC)) {
|
|
var offset = (bite < 0x7F) ? 0x40 : 0x41;
|
|
var lead_offset = (lead < 0xA0) ? 0x81 : 0xC1;
|
|
var code_point = indexCodePointFor((lead - lead_offset) * 188 +
|
|
bite - offset, index('jis0208'));
|
|
if (code_point === null) {
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
}
|
|
byte_pointer.offset(-1);
|
|
return decoderError(fatal);
|
|
}
|
|
if (inRange(bite, 0x00, 0x80)) {
|
|
return bite;
|
|
}
|
|
if (inRange(bite, 0xA1, 0xDF)) {
|
|
return 0xFF61 + bite - 0xA1;
|
|
}
|
|
if (inRange(bite, 0x81, 0x9F) || inRange(bite, 0xE0, 0xFC)) {
|
|
shiftjis_lead = bite;
|
|
return null;
|
|
}
|
|
return decoderError(fatal);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function ShiftJISEncoder(options) {
|
|
var fatal = options.fatal;
|
|
/**
|
|
* @param {ByteOutputStream} output_byte_stream Output byte stream.
|
|
* @param {CodePointInputStream} code_point_pointer Input stream.
|
|
* @return {number} The last byte emitted.
|
|
*/
|
|
this.encode = function(output_byte_stream, code_point_pointer) {
|
|
var code_point = code_point_pointer.get();
|
|
if (code_point === EOF_code_point) {
|
|
return EOF_byte;
|
|
}
|
|
code_point_pointer.offset(1);
|
|
if (inRange(code_point, 0x0000, 0x0080)) {
|
|
return output_byte_stream.emit(code_point);
|
|
}
|
|
if (code_point === 0x00A5) {
|
|
return output_byte_stream.emit(0x5C);
|
|
}
|
|
if (code_point === 0x203E) {
|
|
return output_byte_stream.emit(0x7E);
|
|
}
|
|
if (inRange(code_point, 0xFF61, 0xFF9F)) {
|
|
return output_byte_stream.emit(code_point - 0xFF61 + 0xA1);
|
|
}
|
|
var pointer = indexPointerFor(code_point, index('jis0208'));
|
|
if (pointer === null) {
|
|
return encoderError(code_point);
|
|
}
|
|
var lead = div(pointer, 188);
|
|
var lead_offset = lead < 0x1F ? 0x81 : 0xC1;
|
|
var trail = pointer % 188;
|
|
var offset = trail < 0x3F ? 0x40 : 0x41;
|
|
return output_byte_stream.emit(lead + lead_offset, trail + offset);
|
|
};
|
|
}
|
|
|
|
name_to_encoding['shift_jis'].getEncoder = function(options) {
|
|
return new ShiftJISEncoder(options);
|
|
};
|
|
name_to_encoding['shift_jis'].getDecoder = function(options) {
|
|
return new ShiftJISDecoder(options);
|
|
};
|
|
|
|
//
|
|
// 12. Legacy multi-byte Korean encodings
|
|
//
|
|
|
|
// 12.1 euc-kr
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function EUCKRDecoder(options) {
|
|
var fatal = options.fatal;
|
|
var /** @type {number} */ euckr_lead = 0x00;
|
|
/**
|
|
* @param {ByteInputStream} byte_pointer The byte stream to decode.
|
|
* @return {?number} The next code point decoded, or null if not enough
|
|
* data exists in the input stream to decode a complete code point.
|
|
*/
|
|
this.decode = function(byte_pointer) {
|
|
var bite = byte_pointer.get();
|
|
if (bite === EOF_byte && euckr_lead === 0) {
|
|
return EOF_code_point;
|
|
}
|
|
if (bite === EOF_byte && euckr_lead !== 0) {
|
|
euckr_lead = 0x00;
|
|
return decoderError(fatal);
|
|
}
|
|
byte_pointer.offset(1);
|
|
if (euckr_lead !== 0x00) {
|
|
var lead = euckr_lead;
|
|
var pointer = null;
|
|
euckr_lead = 0x00;
|
|
|
|
if (inRange(lead, 0x81, 0xC6)) {
|
|
var temp = (26 + 26 + 126) * (lead - 0x81);
|
|
if (inRange(bite, 0x41, 0x5A)) {
|
|
pointer = temp + bite - 0x41;
|
|
} else if (inRange(bite, 0x61, 0x7A)) {
|
|
pointer = temp + 26 + bite - 0x61;
|
|
} else if (inRange(bite, 0x81, 0xFE)) {
|
|
pointer = temp + 26 + 26 + bite - 0x81;
|
|
}
|
|
}
|
|
|
|
if (inRange(lead, 0xC7, 0xFD) && inRange(bite, 0xA1, 0xFE)) {
|
|
pointer = (26 + 26 + 126) * (0xC7 - 0x81) + (lead - 0xC7) * 94 +
|
|
(bite - 0xA1);
|
|
}
|
|
|
|
var code_point = (pointer === null) ? null :
|
|
indexCodePointFor(pointer, index('euc-kr'));
|
|
if (pointer === null) {
|
|
byte_pointer.offset(-1);
|
|
}
|
|
if (code_point === null) {
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
}
|
|
|
|
if (inRange(bite, 0x00, 0x7F)) {
|
|
return bite;
|
|
}
|
|
|
|
if (inRange(bite, 0x81, 0xFD)) {
|
|
euckr_lead = bite;
|
|
return null;
|
|
}
|
|
|
|
return decoderError(fatal);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function EUCKREncoder(options) {
|
|
var fatal = options.fatal;
|
|
/**
|
|
* @param {ByteOutputStream} output_byte_stream Output byte stream.
|
|
* @param {CodePointInputStream} code_point_pointer Input stream.
|
|
* @return {number} The last byte emitted.
|
|
*/
|
|
this.encode = function(output_byte_stream, code_point_pointer) {
|
|
var code_point = code_point_pointer.get();
|
|
if (code_point === EOF_code_point) {
|
|
return EOF_byte;
|
|
}
|
|
code_point_pointer.offset(1);
|
|
if (inRange(code_point, 0x0000, 0x007F)) {
|
|
return output_byte_stream.emit(code_point);
|
|
}
|
|
var pointer = indexPointerFor(code_point, index('euc-kr'));
|
|
if (pointer === null) {
|
|
return encoderError(code_point);
|
|
}
|
|
var lead, trail;
|
|
if (pointer < ((26 + 26 + 126) * (0xC7 - 0x81))) {
|
|
lead = div(pointer, (26 + 26 + 126)) + 0x81;
|
|
trail = pointer % (26 + 26 + 126);
|
|
var offset = trail < 26 ? 0x41 : trail < 26 + 26 ? 0x47 : 0x4D;
|
|
return output_byte_stream.emit(lead, trail + offset);
|
|
}
|
|
pointer = pointer - (26 + 26 + 126) * (0xC7 - 0x81);
|
|
lead = div(pointer, 94) + 0xC7;
|
|
trail = pointer % 94 + 0xA1;
|
|
return output_byte_stream.emit(lead, trail);
|
|
};
|
|
}
|
|
|
|
name_to_encoding['euc-kr'].getEncoder = function(options) {
|
|
return new EUCKREncoder(options);
|
|
};
|
|
name_to_encoding['euc-kr'].getDecoder = function(options) {
|
|
return new EUCKRDecoder(options);
|
|
};
|
|
|
|
|
|
//
|
|
// 13. Legacy utf-16 encodings
|
|
//
|
|
|
|
// 13.1 utf-16
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {boolean} utf16_be True if big-endian, false if little-endian.
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function UTF16Decoder(utf16_be, options) {
|
|
var fatal = options.fatal;
|
|
var /** @type {?number} */ utf16_lead_byte = null,
|
|
/** @type {?number} */ utf16_lead_surrogate = null;
|
|
/**
|
|
* @param {ByteInputStream} byte_pointer The byte stream to decode.
|
|
* @return {?number} The next code point decoded, or null if not enough
|
|
* data exists in the input stream to decode a complete code point.
|
|
*/
|
|
this.decode = function(byte_pointer) {
|
|
var bite = byte_pointer.get();
|
|
if (bite === EOF_byte && utf16_lead_byte === null &&
|
|
utf16_lead_surrogate === null) {
|
|
return EOF_code_point;
|
|
}
|
|
if (bite === EOF_byte && (utf16_lead_byte !== null ||
|
|
utf16_lead_surrogate !== null)) {
|
|
return decoderError(fatal);
|
|
}
|
|
byte_pointer.offset(1);
|
|
if (utf16_lead_byte === null) {
|
|
utf16_lead_byte = bite;
|
|
return null;
|
|
}
|
|
var code_point;
|
|
if (utf16_be) {
|
|
code_point = (utf16_lead_byte << 8) + bite;
|
|
} else {
|
|
code_point = (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_point, 0xDC00, 0xDFFF)) {
|
|
return 0x10000 + (lead_surrogate - 0xD800) * 0x400 +
|
|
(code_point - 0xDC00);
|
|
}
|
|
byte_pointer.offset(-2);
|
|
return decoderError(fatal);
|
|
}
|
|
if (inRange(code_point, 0xD800, 0xDBFF)) {
|
|
utf16_lead_surrogate = code_point;
|
|
return null;
|
|
}
|
|
if (inRange(code_point, 0xDC00, 0xDFFF)) {
|
|
return decoderError(fatal);
|
|
}
|
|
return code_point;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {boolean} utf16_be True if big-endian, false if little-endian.
|
|
* @param {{fatal: boolean}} options
|
|
*/
|
|
function UTF16Encoder(utf16_be, options) {
|
|
var fatal = options.fatal;
|
|
/**
|
|
* @param {ByteOutputStream} output_byte_stream Output byte stream.
|
|
* @param {CodePointInputStream} code_point_pointer Input stream.
|
|
* @return {number} The last byte emitted.
|
|
*/
|
|
this.encode = function(output_byte_stream, code_point_pointer) {
|
|
function convert_to_bytes(code_unit) {
|
|
var byte1 = code_unit >> 8;
|
|
var byte2 = code_unit & 0x00FF;
|
|
if (utf16_be) {
|
|
return output_byte_stream.emit(byte1, byte2);
|
|
}
|
|
return output_byte_stream.emit(byte2, byte1);
|
|
}
|
|
var code_point = code_point_pointer.get();
|
|
if (code_point === EOF_code_point) {
|
|
return EOF_byte;
|
|
}
|
|
code_point_pointer.offset(1);
|
|
if (inRange(code_point, 0xD800, 0xDFFF)) {
|
|
encoderError(code_point);
|
|
}
|
|
if (code_point <= 0xFFFF) {
|
|
return convert_to_bytes(code_point);
|
|
}
|
|
var lead = div((code_point - 0x10000), 0x400) + 0xD800;
|
|
var trail = ((code_point - 0x10000) % 0x400) + 0xDC00;
|
|
convert_to_bytes(lead);
|
|
return convert_to_bytes(trail);
|
|
};
|
|
}
|
|
|
|
name_to_encoding['utf-16le'].getEncoder = function(options) {
|
|
return new UTF16Encoder(false, options);
|
|
};
|
|
name_to_encoding['utf-16le'].getDecoder = function(options) {
|
|
return new UTF16Decoder(false, options);
|
|
};
|
|
|
|
// 13.2 utf-16be
|
|
name_to_encoding['utf-16be'].getEncoder = function(options) {
|
|
return new UTF16Encoder(true, options);
|
|
};
|
|
name_to_encoding['utf-16be'].getDecoder = function(options) {
|
|
return new UTF16Decoder(true, options);
|
|
};
|
|
|
|
|
|
// NOTE: currently unused
|
|
/**
|
|
* @param {string} label The encoding label.
|
|
* @param {ByteInputStream} input_stream The byte stream to test.
|
|
*/
|
|
function detectEncoding(label, input_stream) {
|
|
if (input_stream.match([0xFF, 0xFE])) {
|
|
input_stream.offset(2);
|
|
return 'utf-16le';
|
|
}
|
|
if (input_stream.match([0xFE, 0xFF])) {
|
|
input_stream.offset(2);
|
|
return 'utf-16be';
|
|
}
|
|
if (input_stream.match([0xEF, 0xBB, 0xBF])) {
|
|
input_stream.offset(3);
|
|
return 'utf-8';
|
|
}
|
|
return label;
|
|
}
|
|
|
|
//
|
|
// Implementation of Text Encoding Web API
|
|
//
|
|
|
|
/** @const */ var DEFAULT_ENCODING = 'utf-8';
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {string=} opt_encoding The label of the encoding;
|
|
* defaults to 'utf-8'.
|
|
* @param {{fatal: boolean}=} options
|
|
*/
|
|
function TextEncoder(opt_encoding, options) {
|
|
if (!(this instanceof TextEncoder)) {
|
|
throw new TypeError('Constructor cannot be called as a function');
|
|
}
|
|
opt_encoding = opt_encoding ? String(opt_encoding) : DEFAULT_ENCODING;
|
|
options = Object(options);
|
|
/** @private */
|
|
this._encoding = getEncoding(opt_encoding);
|
|
if (this._encoding === null || (this._encoding.name !== 'utf-8' &&
|
|
this._encoding.name !== 'utf-16le' &&
|
|
this._encoding.name !== 'utf-16be'))
|
|
throw new TypeError('Unknown encoding: ' + opt_encoding);
|
|
/** @private @type {boolean} */
|
|
this._streaming = false;
|
|
/** @private */
|
|
this._encoder = null;
|
|
/** @private @type {{fatal: boolean}=} */
|
|
this._options = { fatal: Boolean(options.fatal) };
|
|
|
|
if (Object.defineProperty) {
|
|
Object.defineProperty(
|
|
this, 'encoding',
|
|
{ get: function() { return this._encoding.name; } });
|
|
} else {
|
|
this.encoding = this._encoding.name;
|
|
}
|
|
|
|
return this;
|
|
}
|
|
|
|
TextEncoder.prototype = {
|
|
/**
|
|
* @param {string=} opt_string The string to encode.
|
|
* @param {{stream: boolean}=} options
|
|
*/
|
|
encode: function encode(opt_string, options) {
|
|
opt_string = opt_string ? String(opt_string) : '';
|
|
options = Object(options);
|
|
// TODO: any options?
|
|
if (!this._streaming) {
|
|
this._encoder = this._encoding.getEncoder(this._options);
|
|
}
|
|
this._streaming = Boolean(options.stream);
|
|
|
|
var bytes = [];
|
|
var output_stream = new ByteOutputStream(bytes);
|
|
var input_stream = new CodePointInputStream(opt_string);
|
|
while (input_stream.get() !== EOF_code_point) {
|
|
this._encoder.encode(output_stream, input_stream);
|
|
}
|
|
if (!this._streaming) {
|
|
var last_byte;
|
|
do {
|
|
last_byte = this._encoder.encode(output_stream, input_stream);
|
|
} while (last_byte !== EOF_byte);
|
|
this._encoder = null;
|
|
}
|
|
return new Uint8Array(bytes);
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* @constructor
|
|
* @param {string=} opt_encoding The label of the encoding;
|
|
* defaults to 'utf-8'.
|
|
* @param {{fatal: boolean}=} options
|
|
*/
|
|
function TextDecoder(opt_encoding, options) {
|
|
if (!(this instanceof TextDecoder)) {
|
|
throw new TypeError('Constructor cannot be called as a function');
|
|
}
|
|
opt_encoding = opt_encoding ? String(opt_encoding) : DEFAULT_ENCODING;
|
|
options = Object(options);
|
|
/** @private */
|
|
this._encoding = getEncoding(opt_encoding);
|
|
if (this._encoding === null)
|
|
throw new TypeError('Unknown encoding: ' + opt_encoding);
|
|
|
|
/** @private @type {boolean} */
|
|
this._streaming = false;
|
|
/** @private */
|
|
this._decoder = null;
|
|
/** @private @type {{fatal: boolean}=} */
|
|
this._options = { fatal: Boolean(options.fatal) };
|
|
|
|
if (Object.defineProperty) {
|
|
Object.defineProperty(
|
|
this, 'encoding',
|
|
{ get: function() { return this._encoding.name; } });
|
|
} else {
|
|
this.encoding = this._encoding.name;
|
|
}
|
|
|
|
return this;
|
|
}
|
|
|
|
// TODO: Issue if input byte stream is offset by decoder
|
|
// TODO: BOM detection will not work if stream header spans multiple calls
|
|
// (last N bytes of previous stream may need to be retained?)
|
|
TextDecoder.prototype = {
|
|
/**
|
|
* @param {ArrayBufferView=} opt_view The buffer of bytes to decode.
|
|
* @param {{stream: boolean}=} options
|
|
*/
|
|
decode: function decode(opt_view, options) {
|
|
if (opt_view && !('buffer' in opt_view && 'byteOffset' in opt_view &&
|
|
'byteLength' in opt_view)) {
|
|
throw new TypeError('Expected ArrayBufferView');
|
|
} else if (!opt_view) {
|
|
opt_view = new Uint8Array(0);
|
|
}
|
|
options = Object(options);
|
|
|
|
if (!this._streaming) {
|
|
this._decoder = this._encoding.getDecoder(this._options);
|
|
this._BOMseen = false;
|
|
}
|
|
this._streaming = Boolean(options.stream);
|
|
|
|
var bytes = new Uint8Array(opt_view.buffer,
|
|
opt_view.byteOffset,
|
|
opt_view.byteLength);
|
|
var input_stream = new ByteInputStream(bytes);
|
|
|
|
var output_stream = new CodePointOutputStream(), code_point;
|
|
while (input_stream.get() !== EOF_byte) {
|
|
code_point = this._decoder.decode(input_stream);
|
|
if (code_point !== null && code_point !== EOF_code_point) {
|
|
output_stream.emit(code_point);
|
|
}
|
|
}
|
|
if (!this._streaming) {
|
|
do {
|
|
code_point = this._decoder.decode(input_stream);
|
|
if (code_point !== null && code_point !== EOF_code_point) {
|
|
output_stream.emit(code_point);
|
|
}
|
|
} while (code_point !== EOF_code_point &&
|
|
input_stream.get() != EOF_byte);
|
|
this._decoder = null;
|
|
}
|
|
|
|
var result = output_stream.string();
|
|
if (!this._BOMseen && result.length) {
|
|
this._BOMseen = true;
|
|
if (['utf-8', 'utf-16le', 'utf-16be'].indexOf(this.encoding) !== -1 &&
|
|
result.charCodeAt(0) === 0xFEFF) {
|
|
result = result.substring(1);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
};
|
|
|
|
global['TextEncoder'] = global['TextEncoder'] || TextEncoder;
|
|
global['TextDecoder'] = global['TextDecoder'] || TextDecoder;
|
|
}(this));
|