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// This is free and unencumbered software released into the public domain.
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// See LICENSE.md for more information.
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/**
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* @fileoverview Global |this| required for resolving indexes in node.
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* @suppress {globalThis}
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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 {!Array.<*>} array The array to check.
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* @param {*} item The item to look for in the array.
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* @return {boolean} True if the item appears in the array.
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*/
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function includes(array, item) {
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return array.indexOf(item) !== -1;
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}
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var floor = Math.floor;
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/**
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* @param {*} o
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* @return {Object}
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*/
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function ToDictionary(o) {
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if (o === undefined) return {};
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if (o === Object(o)) return o;
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throw TypeError('Could not convert argument to dictionary');
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}
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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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// https://heycam.github.io/webidl/#dfn-obtain-unicode
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// 1. Let S be the DOMString value.
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var s = String(string);
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// 2. Let n be the length of S.
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var n = s.length;
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// 3. Initialize i to 0.
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var i = 0;
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// 4. Initialize U to be an empty sequence of Unicode characters.
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var u = [];
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// 5. While i < n:
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while (i < n) {
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// 1. Let c be the code unit in S at index i.
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var c = s.charCodeAt(i);
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// 2. Depending on the value of c:
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// c < 0xD800 or c > 0xDFFF
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if (c < 0xD800 || c > 0xDFFF) {
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// Append to U the Unicode character with code point c.
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u.push(c);
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}
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// 0xDC00 ≤ c ≤ 0xDFFF
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else if (0xDC00 <= c && c <= 0xDFFF) {
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// Append to U a U+FFFD REPLACEMENT CHARACTER.
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u.push(0xFFFD);
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}
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// 0xD800 ≤ c ≤ 0xDBFF
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else if (0xD800 <= c && c <= 0xDBFF) {
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// 1. If i = n−1, then append to U a U+FFFD REPLACEMENT
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// CHARACTER.
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if (i === n - 1) {
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u.push(0xFFFD);
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}
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// 2. Otherwise, i < n−1:
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else {
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// 1. Let d be the code unit in S at index i+1.
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var d = s.charCodeAt(i + 1);
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// 2. If 0xDC00 ≤ d ≤ 0xDFFF, then:
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if (0xDC00 <= d && d <= 0xDFFF) {
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// 1. Let a be c & 0x3FF.
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var a = c & 0x3FF;
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// 2. Let b be d & 0x3FF.
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var b = d & 0x3FF;
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// 3. Append to U the Unicode character with code point
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// 2^16+2^10*a+b.
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u.push(0x10000 + (a << 10) + b);
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// 4. Set i to i+1.
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i += 1;
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}
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// 3. Otherwise, d < 0xDC00 or d > 0xDFFF. Append to U a
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// U+FFFD REPLACEMENT CHARACTER.
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else {
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u.push(0xFFFD);
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}
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}
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}
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// 3. Set i to i+1.
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i += 1;
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}
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// 6. Return U.
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return u;
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}
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/**
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* @param {!Array.<number>} code_points Array of code points.
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* @return {string} string String of UTF-16 code units.
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*/
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function codePointsToString(code_points) {
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var s = '';
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for (var i = 0; i < code_points.length; ++i) {
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var cp = code_points[i];
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if (cp <= 0xFFFF) {
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s += String.fromCharCode(cp);
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} else {
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cp -= 0x10000;
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s += String.fromCharCode((cp >> 10) + 0xD800,
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(cp & 0x3FF) + 0xDC00);
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}
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}
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return s;
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}
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//
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// Implementation of Encoding specification
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// https://encoding.spec.whatwg.org/
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//
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//
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// 4. Terminology
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//
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/**
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* An ASCII byte is a byte in the range 0x00 to 0x7F, inclusive.
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* @param {number} a The number to test.
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* @return {boolean} True if a is in the range 0x00 to 0x7F, inclusive.
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*/
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function isASCIIByte(a) {
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return 0x00 <= a && a <= 0x7F;
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}
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/**
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* An ASCII code point is a code point in the range U+0000 to
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* U+007F, inclusive.
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*/
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var isASCIICodePoint = isASCIIByte;
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/**
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* End-of-stream is a special token that signifies no more tokens
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* are in the stream.
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* @const
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*/ var end_of_stream = -1;
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/**
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* A stream represents an ordered sequence of tokens.
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*
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* @constructor
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* @param {!(Array.<number>|Uint8Array)} tokens Array of tokens that provide
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* the stream.
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*/
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function Stream(tokens) {
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/** @type {!Array.<number>} */
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this.tokens = [].slice.call(tokens);
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// Reversed as push/pop is more efficient than shift/unshift.
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this.tokens.reverse();
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}
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Stream.prototype = {
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/**
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* @return {boolean} True if end-of-stream has been hit.
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*/
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endOfStream: function() {
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return !this.tokens.length;
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},
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/**
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* When a token is read from a stream, the first token in the
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* stream must be returned and subsequently removed, and
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* end-of-stream must be returned otherwise.
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*
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* @return {number} Get the next token from the stream, or
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* end_of_stream.
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*/
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read: function() {
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if (!this.tokens.length)
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return end_of_stream;
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return this.tokens.pop();
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},
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/**
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* When one or more tokens are prepended to a stream, those tokens
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* must be inserted, in given order, before the first token in the
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* stream.
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*
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* @param {(number|!Array.<number>)} token The token(s) to prepend to the
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* stream.
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*/
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prepend: function(token) {
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if (Array.isArray(token)) {
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var tokens = /**@type {!Array.<number>}*/(token);
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while (tokens.length)
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this.tokens.push(tokens.pop());
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} else {
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this.tokens.push(token);
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}
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},
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/**
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* When one or more tokens are pushed to a stream, those tokens
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* must be inserted, in given order, after the last token in the
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* stream.
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*
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* @param {(number|!Array.<number>)} token The tokens(s) to push to the
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* stream.
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*/
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push: function(token) {
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if (Array.isArray(token)) {
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var tokens = /**@type {!Array.<number>}*/(token);
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while (tokens.length)
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this.tokens.unshift(tokens.shift());
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} else {
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this.tokens.unshift(token);
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}
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}
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};
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//
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// 5. Encodings
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//
|
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|
|
// 5.1 Encoders and decoders
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/** @const */
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var finished = -1;
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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 TypeError('Decoder error');
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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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* @return {number} Always throws, no value is actually returned.
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|
*/
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|
|
function encoderError(code_point) {
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|
throw TypeError('The code point ' + code_point + ' could not be encoded.');
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|
}
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/** @interface */
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function Decoder() {}
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Decoder.prototype = {
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|
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/**
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* @param {Stream} stream The stream of bytes being decoded.
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|
* @param {number} bite The next byte read from the stream.
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|
|
* @return {?(number|!Array.<number>)} The next code point(s)
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|
* decoded, or null if not enough data exists in the input
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|
|
* stream to decode a complete code point, or |finished|.
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|
*/
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handler: function(stream, bite) {}
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};
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/** @interface */
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function Encoder() {}
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Encoder.prototype = {
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/**
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* @param {Stream} stream The stream of code points being encoded.
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|
* @param {number} code_point Next code point read from the stream.
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|
* @return {(number|!Array.<number>)} Byte(s) to emit, or |finished|.
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|
*/
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handler: function(stream, code_point) {}
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};
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// 5.2 Names and labels
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// TODO: Define @typedef for Encoding: {name:string,labels:Array.<string>}
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// https://github.com/google/closure-compiler/issues/247
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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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// 1. Remove any leading and trailing ASCII whitespace from label.
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label = String(label).trim().toLowerCase();
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// 2. If label is an ASCII case-insensitive match for any of the
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|
|
// labels listed in the table below, return the corresponding
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|
|
// encoding, and failure otherwise.
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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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|
return null;
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|
}
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|
|
/**
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|
* Encodings table: https://encoding.spec.whatwg.org/encodings.json
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|
* @const
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* @type {!Array.<{
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|
* heading: string,
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* encodings: Array.<{name:string,labels:Array.<string>}>
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* }>}
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*/
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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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|
{
|
|
|
"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",
|
|
|
"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"
|
|
|
}
|
|
|
];
|
|
|
|
|
|
// Label to encoding registry.
|
|
|
/** @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;
|
|
|
});
|
|
|
});
|
|
|
});
|
|
|
|
|
|
// Registry of of encoder/decoder factories, by encoding name.
|
|
|
/** @type {Object.<string, function({fatal:boolean}): Encoder>} */
|
|
|
var encoders = {};
|
|
|
/** @type {Object.<string, function({fatal:boolean}): Decoder>} */
|
|
|
var decoders = {};
|
|
|
|
|
|
//
|
|
|
// 6. Indexes
|
|
|
//
|
|
|
|
|
|
/**
|
|
|
* @param {number} pointer The |pointer| to search for.
|
|
|
* @param {(!Array.<?number>|undefined)} 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) {
|
|
|
if (!index) return null;
|
|
|
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 Error("Indexes missing." +
|
|
|
" Did you forget to include encoding-indexes.js first?");
|
|
|
}
|
|
|
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 indexGB18030RangesCodePointFor(pointer) {
|
|
|
// 1. If pointer is greater than 39419 and less than 189000, or
|
|
|
// pointer is greater than 1237575, return null.
|
|
|
if ((pointer > 39419 && pointer < 189000) || (pointer > 1237575))
|
|
|
return null;
|
|
|
|
|
|
// 2. If pointer is 7457, return code point U+E7C7.
|
|
|
if (pointer === 7457) return 0xE7C7;
|
|
|
|
|
|
// 3. Let offset be the last pointer in index gb18030 ranges that
|
|
|
// is equal to or less than pointer and let code point offset be
|
|
|
// its corresponding code point.
|
|
|
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;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// 4. Return a code point whose value is code point offset +
|
|
|
// pointer − offset.
|
|
|
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 indexGB18030RangesPointerFor(code_point) {
|
|
|
// 1. If code point is U+E7C7, return pointer 7457.
|
|
|
if (code_point === 0xE7C7) return 7457;
|
|
|
|
|
|
// 2. Let offset be the last code point in index gb18030 ranges
|
|
|
// that is equal to or less than code point and let pointer offset
|
|
|
// be its corresponding pointer.
|
|
|
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;
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// 3. Return a pointer whose value is pointer offset + code point
|
|
|
// − offset.
|
|
|
return pointer_offset + code_point - offset;
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @param {number} code_point The |code_point| to search for in the Shift_JIS
|
|
|
* index.
|
|
|
* @return {?number} The code point corresponding to |pointer| in |index|,
|
|
|
* or null if |code point| is not in the Shift_JIS index.
|
|
|
*/
|
|
|
function indexShiftJISPointerFor(code_point) {
|
|
|
// 1. Let index be index jis0208 excluding all entries whose
|
|
|
// pointer is in the range 8272 to 8835, inclusive.
|
|
|
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;
|
|
|
|
|
|
// 2. Return the index pointer for code point in index.
|
|
|
return index_.indexOf(code_point);
|
|
|
}
|
|
|
var shift_jis_index;
|
|
|
|
|
|
/**
|
|
|
* @param {number} code_point The |code_point| to search for in the big5
|
|
|
* index.
|
|
|
* @return {?number} The code point corresponding to |pointer| in |index|,
|
|
|
* or null if |code point| is not in the big5 index.
|
|
|
*/
|
|
|
function indexBig5PointerFor(code_point) {
|
|
|
// 1. Let index be index Big5 excluding all entries whose pointer
|
|
|
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;
|
|
|
|
|
|
// 2. If code point is U+2550, U+255E, U+2561, U+256A, U+5341, or
|
|
|
// U+5345, return the last pointer corresponding to code point in
|
|
|
// index.
|
|
|
if (code_point === 0x2550 || code_point === 0x255E ||
|
|
|
code_point === 0x2561 || code_point === 0x256A ||
|
|
|
code_point === 0x5341 || code_point === 0x5345) {
|
|
|
return index_.lastIndexOf(code_point);
|
|
|
}
|
|
|
|
|
|
// 3. Return the index pointer for code point in index.
|
|
|
return indexPointerFor(code_point, index_);
|
|
|
}
|
|
|
var big5_index_no_hkscs;
|
|
|
|
|
|
//
|
|
|
// 8. API
|
|
|
//
|
|
|
|
|
|
/** @const */ var DEFAULT_ENCODING = 'utf-8';
|
|
|
|
|
|
// 8.1 Interface TextDecoder
|
|
|
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @param {string=} label The label of the encoding;
|
|
|
* defaults to 'utf-8'.
|
|
|
* @param {Object=} options
|
|
|
*/
|
|
|
function TextDecoder(label, options) {
|
|
|
// Web IDL conventions
|
|
|
if (!(this instanceof TextDecoder))
|
|
|
throw TypeError('Called as a function. Did you forget \'new\'?');
|
|
|
label = label !== undefined ? String(label) : DEFAULT_ENCODING;
|
|
|
options = ToDictionary(options);
|
|
|
|
|
|
// A TextDecoder object has an associated encoding, decoder,
|
|
|
// stream, ignore BOM flag (initially unset), BOM seen flag
|
|
|
// (initially unset), error mode (initially replacement), and do
|
|
|
// not flush flag (initially unset).
|
|
|
|
|
|
/** @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;
|
|
|
|
|
|
|
|
|
// 1. Let encoding be the result of getting an encoding from
|
|
|
// label.
|
|
|
var encoding = getEncoding(label);
|
|
|
|
|
|
// 2. If encoding is failure or replacement, throw a RangeError.
|
|
|
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?');
|
|
|
}
|
|
|
|
|
|
// 3. Let dec be a new TextDecoder object.
|
|
|
var dec = this;
|
|
|
|
|
|
// 4. Set dec's encoding to encoding.
|
|
|
dec._encoding = encoding;
|
|
|
|
|
|
// 5. If options's fatal member is true, set dec's error mode to
|
|
|
// fatal.
|
|
|
if (Boolean(options['fatal']))
|
|
|
dec._error_mode = 'fatal';
|
|
|
|
|
|
// 6. If options's ignoreBOM member is true, set dec's ignore BOM
|
|
|
// flag.
|
|
|
if (Boolean(options['ignoreBOM']))
|
|
|
dec._ignoreBOM = true;
|
|
|
|
|
|
// For pre-ES5 runtimes:
|
|
|
if (!Object.defineProperty) {
|
|
|
this.encoding = dec._encoding.name.toLowerCase();
|
|
|
this.fatal = dec._error_mode === 'fatal';
|
|
|
this.ignoreBOM = dec._ignoreBOM;
|
|
|
}
|
|
|
|
|
|
// 7. Return dec.
|
|
|
return dec;
|
|
|
}
|
|
|
|
|
|
if (Object.defineProperty) {
|
|
|
// The encoding attribute's getter must return encoding's name.
|
|
|
Object.defineProperty(TextDecoder.prototype, 'encoding', {
|
|
|
/** @this {TextDecoder} */
|
|
|
get: function() { return this._encoding.name.toLowerCase(); }
|
|
|
});
|
|
|
|
|
|
// The fatal attribute's getter must return true if error mode
|
|
|
// is fatal, and false otherwise.
|
|
|
Object.defineProperty(TextDecoder.prototype, 'fatal', {
|
|
|
/** @this {TextDecoder} */
|
|
|
get: function() { return this._error_mode === 'fatal'; }
|
|
|
});
|
|
|
|
|
|
// The ignoreBOM attribute's getter must return true if ignore
|
|
|
// BOM flag is set, and false otherwise.
|
|
|
Object.defineProperty(TextDecoder.prototype, 'ignoreBOM', {
|
|
|
/** @this {TextDecoder} */
|
|
|
get: function() { return this._ignoreBOM; }
|
|
|
});
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @param {BufferSource=} input The buffer of bytes to decode.
|
|
|
* @param {Object=} options
|
|
|
* @return {string} The decoded string.
|
|
|
*/
|
|
|
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);
|
|
|
|
|
|
// 1. If the do not flush flag is unset, set decoder to a new
|
|
|
// encoding's decoder, set stream to a new stream, and unset the
|
|
|
// BOM seen flag.
|
|
|
if (!this._do_not_flush) {
|
|
|
this._decoder = decoders[this._encoding.name]({
|
|
|
fatal: this._error_mode === 'fatal'});
|
|
|
this._BOMseen = false;
|
|
|
}
|
|
|
|
|
|
// 2. If options's stream is true, set the do not flush flag, and
|
|
|
// unset the do not flush flag otherwise.
|
|
|
this._do_not_flush = Boolean(options['stream']);
|
|
|
|
|
|
// 3. If input is given, push a copy of input to stream.
|
|
|
// TODO: Align with spec algorithm - maintain stream on instance.
|
|
|
var input_stream = new Stream(bytes);
|
|
|
|
|
|
// 4. Let output be a new stream.
|
|
|
var output = [];
|
|
|
|
|
|
/** @type {?(number|!Array.<number>)} */
|
|
|
var result;
|
|
|
|
|
|
// 5. While true:
|
|
|
while (true) {
|
|
|
// 1. Let token be the result of reading from stream.
|
|
|
var token = input_stream.read();
|
|
|
|
|
|
// 2. If token is end-of-stream and the do not flush flag is
|
|
|
// set, return output, serialized.
|
|
|
// TODO: Align with spec algorithm.
|
|
|
if (token === end_of_stream)
|
|
|
break;
|
|
|
|
|
|
// 3. Otherwise, run these subsubsteps:
|
|
|
|
|
|
// 1. Let result be the result of processing token for decoder,
|
|
|
// stream, output, and error mode.
|
|
|
result = this._decoder.handler(input_stream, token);
|
|
|
|
|
|
// 2. If result is finished, return output, serialized.
|
|
|
if (result === finished)
|
|
|
break;
|
|
|
|
|
|
if (result !== null) {
|
|
|
if (Array.isArray(result))
|
|
|
output.push.apply(output, /**@type {!Array.<number>}*/(result));
|
|
|
else
|
|
|
output.push(result);
|
|
|
}
|
|
|
|
|
|
// 3. Otherwise, if result is error, throw a TypeError.
|
|
|
// (Thrown in handler)
|
|
|
|
|
|
// 4. Otherwise, do nothing.
|
|
|
}
|
|
|
// TODO: Align with spec algorithm.
|
|
|
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;
|
|
|
}
|
|
|
|
|
|
// A TextDecoder object also has an associated serialize stream
|
|
|
// algorithm...
|
|
|
/**
|
|
|
* @param {!Array.<number>} stream
|
|
|
* @return {string}
|
|
|
* @this {TextDecoder}
|
|
|
*/
|
|
|
function serializeStream(stream) {
|
|
|
// 1. Let token be the result of reading from stream.
|
|
|
// (Done in-place on array, rather than as a stream)
|
|
|
|
|
|
// 2. If encoding is UTF-8, UTF-16BE, or UTF-16LE, and ignore
|
|
|
// BOM flag and BOM seen flag are unset, run these subsubsteps:
|
|
|
if (includes(['UTF-8', 'UTF-16LE', 'UTF-16BE'], this._encoding.name) &&
|
|
|
!this._ignoreBOM && !this._BOMseen) {
|
|
|
if (stream.length > 0 && stream[0] === 0xFEFF) {
|
|
|
// 1. If token is U+FEFF, set BOM seen flag.
|
|
|
this._BOMseen = true;
|
|
|
stream.shift();
|
|
|
} else if (stream.length > 0) {
|
|
|
// 2. Otherwise, if token is not end-of-stream, set BOM seen
|
|
|
// flag and append token to stream.
|
|
|
this._BOMseen = true;
|
|
|
} else {
|
|
|
// 3. Otherwise, if token is not end-of-stream, append token
|
|
|
// to output.
|
|
|
// (no-op)
|
|
|
}
|
|
|
}
|
|
|
// 4. Otherwise, return output.
|
|
|
return codePointsToString(stream);
|
|
|
}
|
|
|
|
|
|
return serializeStream.call(this, output);
|
|
|
};
|
|
|
|
|
|
// 8.2 Interface TextEncoder
|
|
|
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @param {string=} label The label of the encoding. NONSTANDARD.
|
|
|
* @param {Object=} options NONSTANDARD.
|
|
|
*/
|
|
|
function TextEncoder(label, options) {
|
|
|
// Web IDL conventions
|
|
|
if (!(this instanceof TextEncoder))
|
|
|
throw TypeError('Called as a function. Did you forget \'new\'?');
|
|
|
options = ToDictionary(options);
|
|
|
|
|
|
// A TextEncoder object has an associated encoding and encoder.
|
|
|
|
|
|
/** @private */
|
|
|
this._encoding = null;
|
|
|
/** @private @type {?Encoder} */
|
|
|
this._encoder = null;
|
|
|
|
|
|
// Non-standard
|
|
|
/** @private @type {boolean} */
|
|
|
this._do_not_flush = false;
|
|
|
/** @private @type {string} */
|
|
|
this._fatal = Boolean(options['fatal']) ? 'fatal' : 'replacement';
|
|
|
|
|
|
// 1. Let enc be a new TextEncoder object.
|
|
|
var enc = this;
|
|
|
|
|
|
// 2. Set enc's encoding to UTF-8's encoder.
|
|
|
if (Boolean(options['NONSTANDARD_allowLegacyEncoding'])) {
|
|
|
// NONSTANDARD behavior.
|
|
|
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 {
|
|
|
// Standard behavior.
|
|
|
enc._encoding = getEncoding('utf-8');
|
|
|
|
|
|
if (label !== undefined && 'console' in global) {
|
|
|
console.warn('TextEncoder constructor called with encoding label, '
|
|
|
+ 'which is ignored.');
|
|
|
}
|
|
|
}
|
|
|
|
|
|
// For pre-ES5 runtimes:
|
|
|
if (!Object.defineProperty)
|
|
|
this.encoding = enc._encoding.name.toLowerCase();
|
|
|
|
|
|
// 3. Return enc.
|
|
|
return enc;
|
|
|
}
|
|
|
|
|
|
if (Object.defineProperty) {
|
|
|
// The encoding attribute's getter must return encoding's name.
|
|
|
Object.defineProperty(TextEncoder.prototype, 'encoding', {
|
|
|
/** @this {TextEncoder} */
|
|
|
get: function() { return this._encoding.name.toLowerCase(); }
|
|
|
});
|
|
|
}
|
|
|
|
|
|
/**
|
|
|
* @param {string=} opt_string The string to encode.
|
|
|
* @param {Object=} options
|
|
|
* @return {!Uint8Array} Encoded bytes, as a Uint8Array.
|
|
|
*/
|
|
|
TextEncoder.prototype.encode = function encode(opt_string, options) {
|
|
|
opt_string = opt_string === undefined ? '' : String(opt_string);
|
|
|
options = ToDictionary(options);
|
|
|
|
|
|
// NOTE: This option is nonstandard. None of the encodings
|
|
|
// permitted for encoding (i.e. UTF-8, UTF-16) are stateful when
|
|
|
// the input is a USVString so streaming is not necessary.
|
|
|
if (!this._do_not_flush)
|
|
|
this._encoder = encoders[this._encoding.name]({
|
|
|
fatal: this._fatal === 'fatal'});
|
|
|
this._do_not_flush = Boolean(options['stream']);
|
|
|
|
|
|
// 1. Convert input to a stream.
|
|
|
var input = new Stream(stringToCodePoints(opt_string));
|
|
|
|
|
|
// 2. Let output be a new stream
|
|
|
var output = [];
|
|
|
|
|
|
/** @type {?(number|!Array.<number>)} */
|
|
|
var result;
|
|
|
// 3. While true, run these substeps:
|
|
|
while (true) {
|
|
|
// 1. Let token be the result of reading from input.
|
|
|
var token = input.read();
|
|
|
if (token === end_of_stream)
|
|
|
break;
|
|
|
// 2. Let result be the result of processing token for encoder,
|
|
|
// input, output.
|
|
|
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);
|
|
|
}
|
|
|
// TODO: Align with spec algorithm.
|
|
|
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;
|
|
|
}
|
|
|
// 3. If result is finished, convert output into a byte sequence,
|
|
|
// and then return a Uint8Array object wrapping an ArrayBuffer
|
|
|
// containing output.
|
|
|
return new Uint8Array(output);
|
|
|
};
|
|
|
|
|
|
|
|
|
//
|
|
|
// 9. The encoding
|
|
|
//
|
|
|
|
|
|
// 9.1 utf-8
|
|
|
|
|
|
// 9.1.1 utf-8 decoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Decoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function UTF8Decoder(options) {
|
|
|
var fatal = options.fatal;
|
|
|
|
|
|
// utf-8's decoder's has an associated utf-8 code point, utf-8
|
|
|
// bytes seen, and utf-8 bytes needed (all initially 0), a utf-8
|
|
|
// lower boundary (initially 0x80), and a utf-8 upper boundary
|
|
|
// (initially 0xBF).
|
|
|
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;
|
|
|
|
|
|
/**
|
|
|
* @param {Stream} stream The stream of bytes being decoded.
|
|
|
* @param {number} bite The next byte read from the stream.
|
|
|
* @return {?(number|!Array.<number>)} The next code point(s)
|
|
|
* decoded, or null if not enough data exists in the input
|
|
|
* stream to decode a complete code point.
|
|
|
*/
|
|
|
this.handler = function(stream, bite) {
|
|
|
// 1. If byte is end-of-stream and utf-8 bytes needed is not 0,
|
|
|
// set utf-8 bytes needed to 0 and return error.
|
|
|
if (bite === end_of_stream && utf8_bytes_needed !== 0) {
|
|
|
utf8_bytes_needed = 0;
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 2. If byte is end-of-stream, return finished.
|
|
|
if (bite === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 3. If utf-8 bytes needed is 0, based on byte:
|
|
|
if (utf8_bytes_needed === 0) {
|
|
|
|
|
|
// 0x00 to 0x7F
|
|
|
if (inRange(bite, 0x00, 0x7F)) {
|
|
|
// Return a code point whose value is byte.
|
|
|
return bite;
|
|
|
}
|
|
|
|
|
|
// 0xC2 to 0xDF
|
|
|
else if (inRange(bite, 0xC2, 0xDF)) {
|
|
|
// 1. Set utf-8 bytes needed to 1.
|
|
|
utf8_bytes_needed = 1;
|
|
|
|
|
|
// 2. Set UTF-8 code point to byte & 0x1F.
|
|
|
utf8_code_point = bite & 0x1F;
|
|
|
}
|
|
|
|
|
|
// 0xE0 to 0xEF
|
|
|
else if (inRange(bite, 0xE0, 0xEF)) {
|
|
|
// 1. If byte is 0xE0, set utf-8 lower boundary to 0xA0.
|
|
|
if (bite === 0xE0)
|
|
|
utf8_lower_boundary = 0xA0;
|
|
|
// 2. If byte is 0xED, set utf-8 upper boundary to 0x9F.
|
|
|
if (bite === 0xED)
|
|
|
utf8_upper_boundary = 0x9F;
|
|
|
// 3. Set utf-8 bytes needed to 2.
|
|
|
utf8_bytes_needed = 2;
|
|
|
// 4. Set UTF-8 code point to byte & 0xF.
|
|
|
utf8_code_point = bite & 0xF;
|
|
|
}
|
|
|
|
|
|
// 0xF0 to 0xF4
|
|
|
else if (inRange(bite, 0xF0, 0xF4)) {
|
|
|
// 1. If byte is 0xF0, set utf-8 lower boundary to 0x90.
|
|
|
if (bite === 0xF0)
|
|
|
utf8_lower_boundary = 0x90;
|
|
|
// 2. If byte is 0xF4, set utf-8 upper boundary to 0x8F.
|
|
|
if (bite === 0xF4)
|
|
|
utf8_upper_boundary = 0x8F;
|
|
|
// 3. Set utf-8 bytes needed to 3.
|
|
|
utf8_bytes_needed = 3;
|
|
|
// 4. Set UTF-8 code point to byte & 0x7.
|
|
|
utf8_code_point = bite & 0x7;
|
|
|
}
|
|
|
|
|
|
// Otherwise
|
|
|
else {
|
|
|
// Return error.
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// Return continue.
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 4. If byte is not in the range utf-8 lower boundary to utf-8
|
|
|
// upper boundary, inclusive, run these substeps:
|
|
|
if (!inRange(bite, utf8_lower_boundary, utf8_upper_boundary)) {
|
|
|
|
|
|
// 1. Set utf-8 code point, utf-8 bytes needed, and utf-8
|
|
|
// bytes seen to 0, set utf-8 lower boundary to 0x80, and set
|
|
|
// utf-8 upper boundary to 0xBF.
|
|
|
utf8_code_point = utf8_bytes_needed = utf8_bytes_seen = 0;
|
|
|
utf8_lower_boundary = 0x80;
|
|
|
utf8_upper_boundary = 0xBF;
|
|
|
|
|
|
// 2. Prepend byte to stream.
|
|
|
stream.prepend(bite);
|
|
|
|
|
|
// 3. Return error.
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 5. Set utf-8 lower boundary to 0x80 and utf-8 upper boundary
|
|
|
// to 0xBF.
|
|
|
utf8_lower_boundary = 0x80;
|
|
|
utf8_upper_boundary = 0xBF;
|
|
|
|
|
|
// 6. Set UTF-8 code point to (UTF-8 code point << 6) | (byte &
|
|
|
// 0x3F)
|
|
|
utf8_code_point = (utf8_code_point << 6) | (bite & 0x3F);
|
|
|
|
|
|
// 7. Increase utf-8 bytes seen by one.
|
|
|
utf8_bytes_seen += 1;
|
|
|
|
|
|
// 8. If utf-8 bytes seen is not equal to utf-8 bytes needed,
|
|
|
// continue.
|
|
|
if (utf8_bytes_seen !== utf8_bytes_needed)
|
|
|
return null;
|
|
|
|
|
|
// 9. Let code point be utf-8 code point.
|
|
|
var code_point = utf8_code_point;
|
|
|
|
|
|
// 10. Set utf-8 code point, utf-8 bytes needed, and utf-8 bytes
|
|
|
// seen to 0.
|
|
|
utf8_code_point = utf8_bytes_needed = utf8_bytes_seen = 0;
|
|
|
|
|
|
// 11. Return a code point whose value is code point.
|
|
|
return code_point;
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 9.1.2 utf-8 encoder
|
|
|
/**
|
|
|
* @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) {
|
|
|
// 1. If code point is end-of-stream, return finished.
|
|
|
if (code_point === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If code point is an ASCII code point, return a byte whose
|
|
|
// value is code point.
|
|
|
if (isASCIICodePoint(code_point))
|
|
|
return code_point;
|
|
|
|
|
|
// 3. Set count and offset based on the range code point is in:
|
|
|
var count, offset;
|
|
|
// U+0080 to U+07FF, inclusive:
|
|
|
if (inRange(code_point, 0x0080, 0x07FF)) {
|
|
|
// 1 and 0xC0
|
|
|
count = 1;
|
|
|
offset = 0xC0;
|
|
|
}
|
|
|
// U+0800 to U+FFFF, inclusive:
|
|
|
else if (inRange(code_point, 0x0800, 0xFFFF)) {
|
|
|
// 2 and 0xE0
|
|
|
count = 2;
|
|
|
offset = 0xE0;
|
|
|
}
|
|
|
// U+10000 to U+10FFFF, inclusive:
|
|
|
else if (inRange(code_point, 0x10000, 0x10FFFF)) {
|
|
|
// 3 and 0xF0
|
|
|
count = 3;
|
|
|
offset = 0xF0;
|
|
|
}
|
|
|
|
|
|
// 4. Let bytes be a byte sequence whose first byte is (code
|
|
|
// point >> (6 × count)) + offset.
|
|
|
var bytes = [(code_point >> (6 * count)) + offset];
|
|
|
|
|
|
// 5. Run these substeps while count is greater than 0:
|
|
|
while (count > 0) {
|
|
|
|
|
|
// 1. Set temp to code point >> (6 × (count − 1)).
|
|
|
var temp = code_point >> (6 * (count - 1));
|
|
|
|
|
|
// 2. Append to bytes 0x80 | (temp & 0x3F).
|
|
|
bytes.push(0x80 | (temp & 0x3F));
|
|
|
|
|
|
// 3. Decrease count by one.
|
|
|
count -= 1;
|
|
|
}
|
|
|
|
|
|
// 6. Return bytes bytes, in order.
|
|
|
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);
|
|
|
};
|
|
|
|
|
|
//
|
|
|
// 10. Legacy single-byte encodings
|
|
|
//
|
|
|
|
|
|
// 10.1 single-byte decoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Decoder}
|
|
|
* @param {!Array.<number>} index The encoding index.
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function SingleByteDecoder(index, options) {
|
|
|
var fatal = options.fatal;
|
|
|
/**
|
|
|
* @param {Stream} stream The stream of bytes being decoded.
|
|
|
* @param {number} bite The next byte read from the stream.
|
|
|
* @return {?(number|!Array.<number>)} The next code point(s)
|
|
|
* decoded, or null if not enough data exists in the input
|
|
|
* stream to decode a complete code point.
|
|
|
*/
|
|
|
this.handler = function(stream, bite) {
|
|
|
// 1. If byte is end-of-stream, return finished.
|
|
|
if (bite === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If byte is an ASCII byte, return a code point whose value
|
|
|
// is byte.
|
|
|
if (isASCIIByte(bite))
|
|
|
return bite;
|
|
|
|
|
|
// 3. Let code point be the index code point for byte − 0x80 in
|
|
|
// index single-byte.
|
|
|
var code_point = index[bite - 0x80];
|
|
|
|
|
|
// 4. If code point is null, return error.
|
|
|
if (code_point === null)
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
// 5. Return a code point whose value is code point.
|
|
|
return code_point;
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 10.2 single-byte encoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Encoder}
|
|
|
* @param {!Array.<?number>} index The encoding index.
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function SingleByteEncoder(index, 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) {
|
|
|
// 1. If code point is end-of-stream, return finished.
|
|
|
if (code_point === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If code point is an ASCII code point, return a byte whose
|
|
|
// value is code point.
|
|
|
if (isASCIICodePoint(code_point))
|
|
|
return code_point;
|
|
|
|
|
|
// 3. Let pointer be the index pointer for code point in index
|
|
|
// single-byte.
|
|
|
var pointer = indexPointerFor(code_point, index);
|
|
|
|
|
|
// 4. If pointer is null, return error with code point.
|
|
|
if (pointer === null)
|
|
|
encoderError(code_point);
|
|
|
|
|
|
// 5. Return a byte whose value is pointer + 0x80.
|
|
|
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);
|
|
|
};
|
|
|
});
|
|
|
});
|
|
|
}());
|
|
|
|
|
|
//
|
|
|
// 11. Legacy multi-byte Chinese (simplified) encodings
|
|
|
//
|
|
|
|
|
|
// 11.1 gbk
|
|
|
|
|
|
// 11.1.1 gbk decoder
|
|
|
// gbk's decoder is gb18030's decoder.
|
|
|
/** @param {{fatal: boolean}} options */
|
|
|
decoders['GBK'] = function(options) {
|
|
|
return new GB18030Decoder(options);
|
|
|
};
|
|
|
|
|
|
// 11.1.2 gbk encoder
|
|
|
// gbk's encoder is gb18030's encoder with its gbk flag set.
|
|
|
/** @param {{fatal: boolean}} options */
|
|
|
encoders['GBK'] = function(options) {
|
|
|
return new GB18030Encoder(options, true);
|
|
|
};
|
|
|
|
|
|
// 11.2 gb18030
|
|
|
|
|
|
// 11.2.1 gb18030 decoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Decoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function GB18030Decoder(options) {
|
|
|
var fatal = options.fatal;
|
|
|
// gb18030's decoder has an associated gb18030 first, gb18030
|
|
|
// second, and gb18030 third (all initially 0x00).
|
|
|
var /** @type {number} */ gb18030_first = 0x00,
|
|
|
/** @type {number} */ gb18030_second = 0x00,
|
|
|
/** @type {number} */ gb18030_third = 0x00;
|
|
|
/**
|
|
|
* @param {Stream} stream The stream of bytes being decoded.
|
|
|
* @param {number} bite The next byte read from the stream.
|
|
|
* @return {?(number|!Array.<number>)} The next code point(s)
|
|
|
* decoded, or null if not enough data exists in the input
|
|
|
* stream to decode a complete code point.
|
|
|
*/
|
|
|
this.handler = function(stream, bite) {
|
|
|
// 1. If byte is end-of-stream and gb18030 first, gb18030
|
|
|
// second, and gb18030 third are 0x00, return finished.
|
|
|
if (bite === end_of_stream && gb18030_first === 0x00 &&
|
|
|
gb18030_second === 0x00 && gb18030_third === 0x00) {
|
|
|
return finished;
|
|
|
}
|
|
|
// 2. If byte is end-of-stream, and gb18030 first, gb18030
|
|
|
// second, or gb18030 third is not 0x00, set gb18030 first,
|
|
|
// gb18030 second, and gb18030 third to 0x00, and return error.
|
|
|
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;
|
|
|
// 3. If gb18030 third is not 0x00, run these substeps:
|
|
|
if (gb18030_third !== 0x00) {
|
|
|
// 1. Let code point be null.
|
|
|
code_point = null;
|
|
|
// 2. If byte is in the range 0x30 to 0x39, inclusive, set
|
|
|
// code point to the index gb18030 ranges code point for
|
|
|
// (((gb18030 first − 0x81) × 10 + gb18030 second − 0x30) ×
|
|
|
// 126 + gb18030 third − 0x81) × 10 + byte − 0x30.
|
|
|
if (inRange(bite, 0x30, 0x39)) {
|
|
|
code_point = indexGB18030RangesCodePointFor(
|
|
|
(((gb18030_first - 0x81) * 10 + gb18030_second - 0x30) * 126 +
|
|
|
gb18030_third - 0x81) * 10 + bite - 0x30);
|
|
|
}
|
|
|
|
|
|
// 3. Let buffer be a byte sequence consisting of gb18030
|
|
|
// second, gb18030 third, and byte, in order.
|
|
|
var buffer = [gb18030_second, gb18030_third, bite];
|
|
|
|
|
|
// 4. Set gb18030 first, gb18030 second, and gb18030 third to
|
|
|
// 0x00.
|
|
|
gb18030_first = 0x00;
|
|
|
gb18030_second = 0x00;
|
|
|
gb18030_third = 0x00;
|
|
|
|
|
|
// 5. If code point is null, prepend buffer to stream and
|
|
|
// return error.
|
|
|
if (code_point === null) {
|
|
|
stream.prepend(buffer);
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 6. Return a code point whose value is code point.
|
|
|
return code_point;
|
|
|
}
|
|
|
|
|
|
// 4. If gb18030 second is not 0x00, run these substeps:
|
|
|
if (gb18030_second !== 0x00) {
|
|
|
|
|
|
// 1. If byte is in the range 0x81 to 0xFE, inclusive, set
|
|
|
// gb18030 third to byte and return continue.
|
|
|
if (inRange(bite, 0x81, 0xFE)) {
|
|
|
gb18030_third = bite;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 2. Prepend gb18030 second followed by byte to stream, set
|
|
|
// gb18030 first and gb18030 second to 0x00, and return error.
|
|
|
stream.prepend([gb18030_second, bite]);
|
|
|
gb18030_first = 0x00;
|
|
|
gb18030_second = 0x00;
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 5. If gb18030 first is not 0x00, run these substeps:
|
|
|
if (gb18030_first !== 0x00) {
|
|
|
|
|
|
// 1. If byte is in the range 0x30 to 0x39, inclusive, set
|
|
|
// gb18030 second to byte and return continue.
|
|
|
if (inRange(bite, 0x30, 0x39)) {
|
|
|
gb18030_second = bite;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 2. Let lead be gb18030 first, let pointer be null, and set
|
|
|
// gb18030 first to 0x00.
|
|
|
var lead = gb18030_first;
|
|
|
var pointer = null;
|
|
|
gb18030_first = 0x00;
|
|
|
|
|
|
// 3. Let offset be 0x40 if byte is less than 0x7F and 0x41
|
|
|
// otherwise.
|
|
|
var offset = bite < 0x7F ? 0x40 : 0x41;
|
|
|
|
|
|
// 4. If byte is in the range 0x40 to 0x7E, inclusive, or 0x80
|
|
|
// to 0xFE, inclusive, set pointer to (lead − 0x81) × 190 +
|
|
|
// (byte − offset).
|
|
|
if (inRange(bite, 0x40, 0x7E) || inRange(bite, 0x80, 0xFE))
|
|
|
pointer = (lead - 0x81) * 190 + (bite - offset);
|
|
|
|
|
|
// 5. Let code point be null if pointer is null and the index
|
|
|
// code point for pointer in index gb18030 otherwise.
|
|
|
code_point = pointer === null ? null :
|
|
|
indexCodePointFor(pointer, index('gb18030'));
|
|
|
|
|
|
// 6. If code point is null and byte is an ASCII byte, prepend
|
|
|
// byte to stream.
|
|
|
if (code_point === null && isASCIIByte(bite))
|
|
|
stream.prepend(bite);
|
|
|
|
|
|
// 7. If code point is null, return error.
|
|
|
if (code_point === null)
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
// 8. Return a code point whose value is code point.
|
|
|
return code_point;
|
|
|
}
|
|
|
|
|
|
// 6. If byte is an ASCII byte, return a code point whose value
|
|
|
// is byte.
|
|
|
if (isASCIIByte(bite))
|
|
|
return bite;
|
|
|
|
|
|
// 7. If byte is 0x80, return code point U+20AC.
|
|
|
if (bite === 0x80)
|
|
|
return 0x20AC;
|
|
|
|
|
|
// 8. If byte is in the range 0x81 to 0xFE, inclusive, set
|
|
|
// gb18030 first to byte and return continue.
|
|
|
if (inRange(bite, 0x81, 0xFE)) {
|
|
|
gb18030_first = bite;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 9. Return error.
|
|
|
return decoderError(fatal);
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 11.2.2 gb18030 encoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Encoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
* @param {boolean=} gbk_flag
|
|
|
*/
|
|
|
function GB18030Encoder(options, gbk_flag) {
|
|
|
var fatal = options.fatal;
|
|
|
// gb18030's decoder has an associated gbk flag (initially unset).
|
|
|
/**
|
|
|
* @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) {
|
|
|
// 1. If code point is end-of-stream, return finished.
|
|
|
if (code_point === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If code point is an ASCII code point, return a byte whose
|
|
|
// value is code point.
|
|
|
if (isASCIICodePoint(code_point))
|
|
|
return code_point;
|
|
|
|
|
|
// 3. If code point is U+E5E5, return error with code point.
|
|
|
if (code_point === 0xE5E5)
|
|
|
return encoderError(code_point);
|
|
|
|
|
|
// 4. If the gbk flag is set and code point is U+20AC, return
|
|
|
// byte 0x80.
|
|
|
if (gbk_flag && code_point === 0x20AC)
|
|
|
return 0x80;
|
|
|
|
|
|
// 5. Let pointer be the index pointer for code point in index
|
|
|
// gb18030.
|
|
|
var pointer = indexPointerFor(code_point, index('gb18030'));
|
|
|
|
|
|
// 6. If pointer is not null, run these substeps:
|
|
|
if (pointer !== null) {
|
|
|
|
|
|
// 1. Let lead be floor(pointer / 190) + 0x81.
|
|
|
var lead = floor(pointer / 190) + 0x81;
|
|
|
|
|
|
// 2. Let trail be pointer % 190.
|
|
|
var trail = pointer % 190;
|
|
|
|
|
|
// 3. Let offset be 0x40 if trail is less than 0x3F and 0x41 otherwise.
|
|
|
var offset = trail < 0x3F ? 0x40 : 0x41;
|
|
|
|
|
|
// 4. Return two bytes whose values are lead and trail + offset.
|
|
|
return [lead, trail + offset];
|
|
|
}
|
|
|
|
|
|
// 7. If gbk flag is set, return error with code point.
|
|
|
if (gbk_flag)
|
|
|
return encoderError(code_point);
|
|
|
|
|
|
// 8. Set pointer to the index gb18030 ranges pointer for code
|
|
|
// point.
|
|
|
pointer = indexGB18030RangesPointerFor(code_point);
|
|
|
|
|
|
// 9. Let byte1 be floor(pointer / 10 / 126 / 10).
|
|
|
var byte1 = floor(pointer / 10 / 126 / 10);
|
|
|
|
|
|
// 10. Set pointer to pointer − byte1 × 10 × 126 × 10.
|
|
|
pointer = pointer - byte1 * 10 * 126 * 10;
|
|
|
|
|
|
// 11. Let byte2 be floor(pointer / 10 / 126).
|
|
|
var byte2 = floor(pointer / 10 / 126);
|
|
|
|
|
|
// 12. Set pointer to pointer − byte2 × 10 × 126.
|
|
|
pointer = pointer - byte2 * 10 * 126;
|
|
|
|
|
|
// 13. Let byte3 be floor(pointer / 10).
|
|
|
var byte3 = floor(pointer / 10);
|
|
|
|
|
|
// 14. Let byte4 be pointer − byte3 × 10.
|
|
|
var byte4 = pointer - byte3 * 10;
|
|
|
|
|
|
// 15. Return four bytes whose values are byte1 + 0x81, byte2 +
|
|
|
// 0x30, byte3 + 0x81, byte4 + 0x30.
|
|
|
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);
|
|
|
};
|
|
|
|
|
|
|
|
|
//
|
|
|
// 12. Legacy multi-byte Chinese (traditional) encodings
|
|
|
//
|
|
|
|
|
|
// 12.1 Big5
|
|
|
|
|
|
// 12.1.1 Big5 decoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Decoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function Big5Decoder(options) {
|
|
|
var fatal = options.fatal;
|
|
|
// Big5's decoder has an associated Big5 lead (initially 0x00).
|
|
|
var /** @type {number} */ Big5_lead = 0x00;
|
|
|
|
|
|
/**
|
|
|
* @param {Stream} stream The stream of bytes being decoded.
|
|
|
* @param {number} bite The next byte read from the stream.
|
|
|
* @return {?(number|!Array.<number>)} The next code point(s)
|
|
|
* decoded, or null if not enough data exists in the input
|
|
|
* stream to decode a complete code point.
|
|
|
*/
|
|
|
this.handler = function(stream, bite) {
|
|
|
// 1. If byte is end-of-stream and Big5 lead is not 0x00, set
|
|
|
// Big5 lead to 0x00 and return error.
|
|
|
if (bite === end_of_stream && Big5_lead !== 0x00) {
|
|
|
Big5_lead = 0x00;
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 2. If byte is end-of-stream and Big5 lead is 0x00, return
|
|
|
// finished.
|
|
|
if (bite === end_of_stream && Big5_lead === 0x00)
|
|
|
return finished;
|
|
|
|
|
|
// 3. If Big5 lead is not 0x00, let lead be Big5 lead, let
|
|
|
// pointer be null, set Big5 lead to 0x00, and then run these
|
|
|
// substeps:
|
|
|
if (Big5_lead !== 0x00) {
|
|
|
var lead = Big5_lead;
|
|
|
var pointer = null;
|
|
|
Big5_lead = 0x00;
|
|
|
|
|
|
// 1. Let offset be 0x40 if byte is less than 0x7F and 0x62
|
|
|
// otherwise.
|
|
|
var offset = bite < 0x7F ? 0x40 : 0x62;
|
|
|
|
|
|
// 2. If byte is in the range 0x40 to 0x7E, inclusive, or 0xA1
|
|
|
// to 0xFE, inclusive, set pointer to (lead − 0x81) × 157 +
|
|
|
// (byte − offset).
|
|
|
if (inRange(bite, 0x40, 0x7E) || inRange(bite, 0xA1, 0xFE))
|
|
|
pointer = (lead - 0x81) * 157 + (bite - offset);
|
|
|
|
|
|
// 3. If there is a row in the table below whose first column
|
|
|
// is pointer, return the two code points listed in its second
|
|
|
// column
|
|
|
// Pointer | Code points
|
|
|
// --------+--------------
|
|
|
// 1133 | U+00CA U+0304
|
|
|
// 1135 | U+00CA U+030C
|
|
|
// 1164 | U+00EA U+0304
|
|
|
// 1166 | U+00EA U+030C
|
|
|
switch (pointer) {
|
|
|
case 1133: return [0x00CA, 0x0304];
|
|
|
case 1135: return [0x00CA, 0x030C];
|
|
|
case 1164: return [0x00EA, 0x0304];
|
|
|
case 1166: return [0x00EA, 0x030C];
|
|
|
}
|
|
|
|
|
|
// 4. Let code point be null if pointer is null and the index
|
|
|
// code point for pointer in index Big5 otherwise.
|
|
|
var code_point = (pointer === null) ? null :
|
|
|
indexCodePointFor(pointer, index('big5'));
|
|
|
|
|
|
// 5. If code point is null and byte is an ASCII byte, prepend
|
|
|
// byte to stream.
|
|
|
if (code_point === null && isASCIIByte(bite))
|
|
|
stream.prepend(bite);
|
|
|
|
|
|
// 6. If code point is null, return error.
|
|
|
if (code_point === null)
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
// 7. Return a code point whose value is code point.
|
|
|
return code_point;
|
|
|
}
|
|
|
|
|
|
// 4. If byte is an ASCII byte, return a code point whose value
|
|
|
// is byte.
|
|
|
if (isASCIIByte(bite))
|
|
|
return bite;
|
|
|
|
|
|
// 5. If byte is in the range 0x81 to 0xFE, inclusive, set Big5
|
|
|
// lead to byte and return continue.
|
|
|
if (inRange(bite, 0x81, 0xFE)) {
|
|
|
Big5_lead = bite;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 6. Return error.
|
|
|
return decoderError(fatal);
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 12.1.2 Big5 encoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Encoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function Big5Encoder(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) {
|
|
|
// 1. If code point is end-of-stream, return finished.
|
|
|
if (code_point === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If code point is an ASCII code point, return a byte whose
|
|
|
// value is code point.
|
|
|
if (isASCIICodePoint(code_point))
|
|
|
return code_point;
|
|
|
|
|
|
// 3. Let pointer be the index Big5 pointer for code point.
|
|
|
var pointer = indexBig5PointerFor(code_point);
|
|
|
|
|
|
// 4. If pointer is null, return error with code point.
|
|
|
if (pointer === null)
|
|
|
return encoderError(code_point);
|
|
|
|
|
|
// 5. Let lead be floor(pointer / 157) + 0x81.
|
|
|
var lead = floor(pointer / 157) + 0x81;
|
|
|
|
|
|
// 6. If lead is less than 0xA1, return error with code point.
|
|
|
if (lead < 0xA1)
|
|
|
return encoderError(code_point);
|
|
|
|
|
|
// 7. Let trail be pointer % 157.
|
|
|
var trail = pointer % 157;
|
|
|
|
|
|
// 8. Let offset be 0x40 if trail is less than 0x3F and 0x62
|
|
|
// otherwise.
|
|
|
var offset = trail < 0x3F ? 0x40 : 0x62;
|
|
|
|
|
|
// Return two bytes whose values are lead and trail + offset.
|
|
|
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);
|
|
|
};
|
|
|
|
|
|
|
|
|
//
|
|
|
// 13. Legacy multi-byte Japanese encodings
|
|
|
//
|
|
|
|
|
|
// 13.1 euc-jp
|
|
|
|
|
|
// 13.1.1 euc-jp decoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Decoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function EUCJPDecoder(options) {
|
|
|
var fatal = options.fatal;
|
|
|
|
|
|
// euc-jp's decoder has an associated euc-jp jis0212 flag
|
|
|
// (initially unset) and euc-jp lead (initially 0x00).
|
|
|
var /** @type {boolean} */ eucjp_jis0212_flag = false,
|
|
|
/** @type {number} */ eucjp_lead = 0x00;
|
|
|
|
|
|
/**
|
|
|
* @param {Stream} stream The stream of bytes being decoded.
|
|
|
* @param {number} bite The next byte read from the stream.
|
|
|
* @return {?(number|!Array.<number>)} The next code point(s)
|
|
|
* decoded, or null if not enough data exists in the input
|
|
|
* stream to decode a complete code point.
|
|
|
*/
|
|
|
this.handler = function(stream, bite) {
|
|
|
// 1. If byte is end-of-stream and euc-jp lead is not 0x00, set
|
|
|
// euc-jp lead to 0x00, and return error.
|
|
|
if (bite === end_of_stream && eucjp_lead !== 0x00) {
|
|
|
eucjp_lead = 0x00;
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 2. If byte is end-of-stream and euc-jp lead is 0x00, return
|
|
|
// finished.
|
|
|
if (bite === end_of_stream && eucjp_lead === 0x00)
|
|
|
return finished;
|
|
|
|
|
|
// 3. If euc-jp lead is 0x8E and byte is in the range 0xA1 to
|
|
|
// 0xDF, inclusive, set euc-jp lead to 0x00 and return a code
|
|
|
// point whose value is 0xFF61 − 0xA1 + byte.
|
|
|
if (eucjp_lead === 0x8E && inRange(bite, 0xA1, 0xDF)) {
|
|
|
eucjp_lead = 0x00;
|
|
|
return 0xFF61 - 0xA1 + bite;
|
|
|
}
|
|
|
|
|
|
// 4. If euc-jp lead is 0x8F and byte is in the range 0xA1 to
|
|
|
// 0xFE, inclusive, set the euc-jp jis0212 flag, set euc-jp lead
|
|
|
// to byte, and return continue.
|
|
|
if (eucjp_lead === 0x8F && inRange(bite, 0xA1, 0xFE)) {
|
|
|
eucjp_jis0212_flag = true;
|
|
|
eucjp_lead = bite;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 5. If euc-jp lead is not 0x00, let lead be euc-jp lead, set
|
|
|
// euc-jp lead to 0x00, and run these substeps:
|
|
|
if (eucjp_lead !== 0x00) {
|
|
|
var lead = eucjp_lead;
|
|
|
eucjp_lead = 0x00;
|
|
|
|
|
|
// 1. Let code point be null.
|
|
|
var code_point = null;
|
|
|
|
|
|
// 2. If lead and byte are both in the range 0xA1 to 0xFE,
|
|
|
// inclusive, set code point to the index code point for (lead
|
|
|
// − 0xA1) × 94 + byte − 0xA1 in index jis0208 if the euc-jp
|
|
|
// jis0212 flag is unset and in index jis0212 otherwise.
|
|
|
if (inRange(lead, 0xA1, 0xFE) && inRange(bite, 0xA1, 0xFE)) {
|
|
|
code_point = indexCodePointFor(
|
|
|
(lead - 0xA1) * 94 + (bite - 0xA1),
|
|
|
index(!eucjp_jis0212_flag ? 'jis0208' : 'jis0212'));
|
|
|
}
|
|
|
|
|
|
// 3. Unset the euc-jp jis0212 flag.
|
|
|
eucjp_jis0212_flag = false;
|
|
|
|
|
|
// 4. If byte is not in the range 0xA1 to 0xFE, inclusive,
|
|
|
// prepend byte to stream.
|
|
|
if (!inRange(bite, 0xA1, 0xFE))
|
|
|
stream.prepend(bite);
|
|
|
|
|
|
// 5. If code point is null, return error.
|
|
|
if (code_point === null)
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
// 6. Return a code point whose value is code point.
|
|
|
return code_point;
|
|
|
}
|
|
|
|
|
|
// 6. If byte is an ASCII byte, return a code point whose value
|
|
|
// is byte.
|
|
|
if (isASCIIByte(bite))
|
|
|
return bite;
|
|
|
|
|
|
// 7. If byte is 0x8E, 0x8F, or in the range 0xA1 to 0xFE,
|
|
|
// inclusive, set euc-jp lead to byte and return continue.
|
|
|
if (bite === 0x8E || bite === 0x8F || inRange(bite, 0xA1, 0xFE)) {
|
|
|
eucjp_lead = bite;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 8. Return error.
|
|
|
return decoderError(fatal);
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 13.1.2 euc-jp encoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Encoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function EUCJPEncoder(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) {
|
|
|
// 1. If code point is end-of-stream, return finished.
|
|
|
if (code_point === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If code point is an ASCII code point, return a byte whose
|
|
|
// value is code point.
|
|
|
if (isASCIICodePoint(code_point))
|
|
|
return code_point;
|
|
|
|
|
|
// 3. If code point is U+00A5, return byte 0x5C.
|
|
|
if (code_point === 0x00A5)
|
|
|
return 0x5C;
|
|
|
|
|
|
// 4. If code point is U+203E, return byte 0x7E.
|
|
|
if (code_point === 0x203E)
|
|
|
return 0x7E;
|
|
|
|
|
|
// 5. If code point is in the range U+FF61 to U+FF9F, inclusive,
|
|
|
// return two bytes whose values are 0x8E and code point −
|
|
|
// 0xFF61 + 0xA1.
|
|
|
if (inRange(code_point, 0xFF61, 0xFF9F))
|
|
|
return [0x8E, code_point - 0xFF61 + 0xA1];
|
|
|
|
|
|
// 6. If code point is U+2212, set it to U+FF0D.
|
|
|
if (code_point === 0x2212)
|
|
|
code_point = 0xFF0D;
|
|
|
|
|
|
// 7. Let pointer be the index pointer for code point in index
|
|
|
// jis0208.
|
|
|
var pointer = indexPointerFor(code_point, index('jis0208'));
|
|
|
|
|
|
// 8. If pointer is null, return error with code point.
|
|
|
if (pointer === null)
|
|
|
return encoderError(code_point);
|
|
|
|
|
|
// 9. Let lead be floor(pointer / 94) + 0xA1.
|
|
|
var lead = floor(pointer / 94) + 0xA1;
|
|
|
|
|
|
// 10. Let trail be pointer % 94 + 0xA1.
|
|
|
var trail = pointer % 94 + 0xA1;
|
|
|
|
|
|
// 11. Return two bytes whose values are lead and trail.
|
|
|
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);
|
|
|
};
|
|
|
|
|
|
// 13.2 iso-2022-jp
|
|
|
|
|
|
// 13.2.1 iso-2022-jp decoder
|
|
|
/**
|
|
|
* @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
|
|
|
};
|
|
|
// iso-2022-jp's decoder has an associated iso-2022-jp decoder
|
|
|
// state (initially ASCII), iso-2022-jp decoder output state
|
|
|
// (initially ASCII), iso-2022-jp lead (initially 0x00), and
|
|
|
// iso-2022-jp output flag (initially unset).
|
|
|
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;
|
|
|
/**
|
|
|
* @param {Stream} stream The stream of bytes being decoded.
|
|
|
* @param {number} bite The next byte read from the stream.
|
|
|
* @return {?(number|!Array.<number>)} The next code point(s)
|
|
|
* decoded, or null if not enough data exists in the input
|
|
|
* stream to decode a complete code point.
|
|
|
*/
|
|
|
this.handler = function(stream, bite) {
|
|
|
// switching on iso-2022-jp decoder state:
|
|
|
switch (iso2022jp_decoder_state) {
|
|
|
default:
|
|
|
case states.ASCII:
|
|
|
// ASCII
|
|
|
// Based on byte:
|
|
|
|
|
|
// 0x1B
|
|
|
if (bite === 0x1B) {
|
|
|
// Set iso-2022-jp decoder state to escape start and return
|
|
|
// continue.
|
|
|
iso2022jp_decoder_state = states.EscapeStart;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 0x00 to 0x7F, excluding 0x0E, 0x0F, and 0x1B
|
|
|
if (inRange(bite, 0x00, 0x7F) && bite !== 0x0E
|
|
|
&& bite !== 0x0F && bite !== 0x1B) {
|
|
|
// Unset the iso-2022-jp output flag and return a code point
|
|
|
// whose value is byte.
|
|
|
iso2022jp_output_flag = false;
|
|
|
return bite;
|
|
|
}
|
|
|
|
|
|
// end-of-stream
|
|
|
if (bite === end_of_stream) {
|
|
|
// Return finished.
|
|
|
return finished;
|
|
|
}
|
|
|
|
|
|
// Otherwise
|
|
|
// Unset the iso-2022-jp output flag and return error.
|
|
|
iso2022jp_output_flag = false;
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
case states.Roman:
|
|
|
// Roman
|
|
|
// Based on byte:
|
|
|
|
|
|
// 0x1B
|
|
|
if (bite === 0x1B) {
|
|
|
// Set iso-2022-jp decoder state to escape start and return
|
|
|
// continue.
|
|
|
iso2022jp_decoder_state = states.EscapeStart;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 0x5C
|
|
|
if (bite === 0x5C) {
|
|
|
// Unset the iso-2022-jp output flag and return code point
|
|
|
// U+00A5.
|
|
|
iso2022jp_output_flag = false;
|
|
|
return 0x00A5;
|
|
|
}
|
|
|
|
|
|
// 0x7E
|
|
|
if (bite === 0x7E) {
|
|
|
// Unset the iso-2022-jp output flag and return code point
|
|
|
// U+203E.
|
|
|
iso2022jp_output_flag = false;
|
|
|
return 0x203E;
|
|
|
}
|
|
|
|
|
|
// 0x00 to 0x7F, excluding 0x0E, 0x0F, 0x1B, 0x5C, and 0x7E
|
|
|
if (inRange(bite, 0x00, 0x7F) && bite !== 0x0E && bite !== 0x0F
|
|
|
&& bite !== 0x1B && bite !== 0x5C && bite !== 0x7E) {
|
|
|
// Unset the iso-2022-jp output flag and return a code point
|
|
|
// whose value is byte.
|
|
|
iso2022jp_output_flag = false;
|
|
|
return bite;
|
|
|
}
|
|
|
|
|
|
// end-of-stream
|
|
|
if (bite === end_of_stream) {
|
|
|
// Return finished.
|
|
|
return finished;
|
|
|
}
|
|
|
|
|
|
// Otherwise
|
|
|
// Unset the iso-2022-jp output flag and return error.
|
|
|
iso2022jp_output_flag = false;
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
case states.Katakana:
|
|
|
// Katakana
|
|
|
// Based on byte:
|
|
|
|
|
|
// 0x1B
|
|
|
if (bite === 0x1B) {
|
|
|
// Set iso-2022-jp decoder state to escape start and return
|
|
|
// continue.
|
|
|
iso2022jp_decoder_state = states.EscapeStart;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 0x21 to 0x5F
|
|
|
if (inRange(bite, 0x21, 0x5F)) {
|
|
|
// Unset the iso-2022-jp output flag and return a code point
|
|
|
// whose value is 0xFF61 − 0x21 + byte.
|
|
|
iso2022jp_output_flag = false;
|
|
|
return 0xFF61 - 0x21 + bite;
|
|
|
}
|
|
|
|
|
|
// end-of-stream
|
|
|
if (bite === end_of_stream) {
|
|
|
// Return finished.
|
|
|
return finished;
|
|
|
}
|
|
|
|
|
|
// Otherwise
|
|
|
// Unset the iso-2022-jp output flag and return error.
|
|
|
iso2022jp_output_flag = false;
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
case states.LeadByte:
|
|
|
// Lead byte
|
|
|
// Based on byte:
|
|
|
|
|
|
// 0x1B
|
|
|
if (bite === 0x1B) {
|
|
|
// Set iso-2022-jp decoder state to escape start and return
|
|
|
// continue.
|
|
|
iso2022jp_decoder_state = states.EscapeStart;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 0x21 to 0x7E
|
|
|
if (inRange(bite, 0x21, 0x7E)) {
|
|
|
// Unset the iso-2022-jp output flag, set iso-2022-jp lead
|
|
|
// to byte, iso-2022-jp decoder state to trail byte, and
|
|
|
// return continue.
|
|
|
iso2022jp_output_flag = false;
|
|
|
iso2022jp_lead = bite;
|
|
|
iso2022jp_decoder_state = states.TrailByte;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// end-of-stream
|
|
|
if (bite === end_of_stream) {
|
|
|
// Return finished.
|
|
|
return finished;
|
|
|
}
|
|
|
|
|
|
// Otherwise
|
|
|
// Unset the iso-2022-jp output flag and return error.
|
|
|
iso2022jp_output_flag = false;
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
case states.TrailByte:
|
|
|
// Trail byte
|
|
|
// Based on byte:
|
|
|
|
|
|
// 0x1B
|
|
|
if (bite === 0x1B) {
|
|
|
// Set iso-2022-jp decoder state to escape start and return
|
|
|
// continue.
|
|
|
iso2022jp_decoder_state = states.EscapeStart;
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 0x21 to 0x7E
|
|
|
if (inRange(bite, 0x21, 0x7E)) {
|
|
|
// 1. Set the iso-2022-jp decoder state to lead byte.
|
|
|
iso2022jp_decoder_state = states.LeadByte;
|
|
|
|
|
|
// 2. Let pointer be (iso-2022-jp lead − 0x21) × 94 + byte − 0x21.
|
|
|
var pointer = (iso2022jp_lead - 0x21) * 94 + bite - 0x21;
|
|
|
|
|
|
// 3. Let code point be the index code point for pointer in
|
|
|
// index jis0208.
|
|
|
var code_point = indexCodePointFor(pointer, index('jis0208'));
|
|
|
|
|
|
// 4. If code point is null, return error.
|
|
|
if (code_point === null)
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
// 5. Return a code point whose value is code point.
|
|
|
return code_point;
|
|
|
}
|
|
|
|
|
|
// end-of-stream
|
|
|
if (bite === end_of_stream) {
|
|
|
// Set the iso-2022-jp decoder state to lead byte, prepend
|
|
|
// byte to stream, and return error.
|
|
|
iso2022jp_decoder_state = states.LeadByte;
|
|
|
stream.prepend(bite);
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// Otherwise
|
|
|
// Set iso-2022-jp decoder state to lead byte and return
|
|
|
// error.
|
|
|
iso2022jp_decoder_state = states.LeadByte;
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
case states.EscapeStart:
|
|
|
// Escape start
|
|
|
|
|
|
// 1. If byte is either 0x24 or 0x28, set iso-2022-jp lead to
|
|
|
// byte, iso-2022-jp decoder state to escape, and return
|
|
|
// continue.
|
|
|
if (bite === 0x24 || bite === 0x28) {
|
|
|
iso2022jp_lead = bite;
|
|
|
iso2022jp_decoder_state = states.Escape;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 2. Prepend byte to stream.
|
|
|
stream.prepend(bite);
|
|
|
|
|
|
// 3. Unset the iso-2022-jp output flag, set iso-2022-jp
|
|
|
// decoder state to iso-2022-jp decoder output state, and
|
|
|
// return error.
|
|
|
iso2022jp_output_flag = false;
|
|
|
iso2022jp_decoder_state = iso2022jp_decoder_output_state;
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
case states.Escape:
|
|
|
// Escape
|
|
|
|
|
|
// 1. Let lead be iso-2022-jp lead and set iso-2022-jp lead to
|
|
|
// 0x00.
|
|
|
var lead = iso2022jp_lead;
|
|
|
iso2022jp_lead = 0x00;
|
|
|
|
|
|
// 2. Let state be null.
|
|
|
var state = null;
|
|
|
|
|
|
// 3. If lead is 0x28 and byte is 0x42, set state to ASCII.
|
|
|
if (lead === 0x28 && bite === 0x42)
|
|
|
state = states.ASCII;
|
|
|
|
|
|
// 4. If lead is 0x28 and byte is 0x4A, set state to Roman.
|
|
|
if (lead === 0x28 && bite === 0x4A)
|
|
|
state = states.Roman;
|
|
|
|
|
|
// 5. If lead is 0x28 and byte is 0x49, set state to Katakana.
|
|
|
if (lead === 0x28 && bite === 0x49)
|
|
|
state = states.Katakana;
|
|
|
|
|
|
// 6. If lead is 0x24 and byte is either 0x40 or 0x42, set
|
|
|
// state to lead byte.
|
|
|
if (lead === 0x24 && (bite === 0x40 || bite === 0x42))
|
|
|
state = states.LeadByte;
|
|
|
|
|
|
// 7. If state is non-null, run these substeps:
|
|
|
if (state !== null) {
|
|
|
// 1. Set iso-2022-jp decoder state and iso-2022-jp decoder
|
|
|
// output state to states.
|
|
|
iso2022jp_decoder_state = iso2022jp_decoder_state = state;
|
|
|
|
|
|
// 2. Let output flag be the iso-2022-jp output flag.
|
|
|
var output_flag = iso2022jp_output_flag;
|
|
|
|
|
|
// 3. Set the iso-2022-jp output flag.
|
|
|
iso2022jp_output_flag = true;
|
|
|
|
|
|
// 4. Return continue, if output flag is unset, and error
|
|
|
// otherwise.
|
|
|
return !output_flag ? null : decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 8. Prepend lead and byte to stream.
|
|
|
stream.prepend([lead, bite]);
|
|
|
|
|
|
// 9. Unset the iso-2022-jp output flag, set iso-2022-jp
|
|
|
// decoder state to iso-2022-jp decoder output state and
|
|
|
// return error.
|
|
|
iso2022jp_output_flag = false;
|
|
|
iso2022jp_decoder_state = iso2022jp_decoder_output_state;
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 13.2.2 iso-2022-jp encoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Encoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function ISO2022JPEncoder(options) {
|
|
|
var fatal = options.fatal;
|
|
|
// iso-2022-jp's encoder has an associated iso-2022-jp encoder
|
|
|
// state which is one of ASCII, Roman, and jis0208 (initially
|
|
|
// ASCII).
|
|
|
/** @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) {
|
|
|
// 1. If code point is end-of-stream and iso-2022-jp encoder
|
|
|
// state is not ASCII, prepend code point to stream, set
|
|
|
// iso-2022-jp encoder state to ASCII, and return three bytes
|
|
|
// 0x1B 0x28 0x42.
|
|
|
if (code_point === end_of_stream &&
|
|
|
iso2022jp_state !== states.ASCII) {
|
|
|
stream.prepend(code_point);
|
|
|
iso2022jp_state = states.ASCII;
|
|
|
return [0x1B, 0x28, 0x42];
|
|
|
}
|
|
|
|
|
|
// 2. If code point is end-of-stream and iso-2022-jp encoder
|
|
|
// state is ASCII, return finished.
|
|
|
if (code_point === end_of_stream && iso2022jp_state === states.ASCII)
|
|
|
return finished;
|
|
|
|
|
|
// 3. If ISO-2022-JP encoder state is ASCII or Roman, and code
|
|
|
// point is U+000E, U+000F, or U+001B, return error with U+FFFD.
|
|
|
if ((iso2022jp_state === states.ASCII ||
|
|
|
iso2022jp_state === states.Roman) &&
|
|
|
(code_point === 0x000E || code_point === 0x000F ||
|
|
|
code_point === 0x001B)) {
|
|
|
return encoderError(0xFFFD);
|
|
|
}
|
|
|
|
|
|
// 4. If iso-2022-jp encoder state is ASCII and code point is an
|
|
|
// ASCII code point, return a byte whose value is code point.
|
|
|
if (iso2022jp_state === states.ASCII &&
|
|
|
isASCIICodePoint(code_point))
|
|
|
return code_point;
|
|
|
|
|
|
// 5. If iso-2022-jp encoder state is Roman and code point is an
|
|
|
// ASCII code point, excluding U+005C and U+007E, or is U+00A5
|
|
|
// or U+203E, run these substeps:
|
|
|
if (iso2022jp_state === states.Roman &&
|
|
|
((isASCIICodePoint(code_point) &&
|
|
|
code_point !== 0x005C && code_point !== 0x007E) ||
|
|
|
(code_point == 0x00A5 || code_point == 0x203E))) {
|
|
|
|
|
|
// 1. If code point is an ASCII code point, return a byte
|
|
|
// whose value is code point.
|
|
|
if (isASCIICodePoint(code_point))
|
|
|
return code_point;
|
|
|
|
|
|
// 2. If code point is U+00A5, return byte 0x5C.
|
|
|
if (code_point === 0x00A5)
|
|
|
return 0x5C;
|
|
|
|
|
|
// 3. If code point is U+203E, return byte 0x7E.
|
|
|
if (code_point === 0x203E)
|
|
|
return 0x7E;
|
|
|
}
|
|
|
|
|
|
// 6. If code point is an ASCII code point, and iso-2022-jp
|
|
|
// encoder state is not ASCII, prepend code point to stream, set
|
|
|
// iso-2022-jp encoder state to ASCII, and return three bytes
|
|
|
// 0x1B 0x28 0x42.
|
|
|
if (isASCIICodePoint(code_point) &&
|
|
|
iso2022jp_state !== states.ASCII) {
|
|
|
stream.prepend(code_point);
|
|
|
iso2022jp_state = states.ASCII;
|
|
|
return [0x1B, 0x28, 0x42];
|
|
|
}
|
|
|
|
|
|
// 7. If code point is either U+00A5 or U+203E, and iso-2022-jp
|
|
|
// encoder state is not Roman, prepend code point to stream, set
|
|
|
// iso-2022-jp encoder state to Roman, and return three bytes
|
|
|
// 0x1B 0x28 0x4A.
|
|
|
if ((code_point === 0x00A5 || code_point === 0x203E) &&
|
|
|
iso2022jp_state !== states.Roman) {
|
|
|
stream.prepend(code_point);
|
|
|
iso2022jp_state = states.Roman;
|
|
|
return [0x1B, 0x28, 0x4A];
|
|
|
}
|
|
|
|
|
|
// 8. If code point is U+2212, set it to U+FF0D.
|
|
|
if (code_point === 0x2212)
|
|
|
code_point = 0xFF0D;
|
|
|
|
|
|
// 9. Let pointer be the index pointer for code point in index
|
|
|
// jis0208.
|
|
|
var pointer = indexPointerFor(code_point, index('jis0208'));
|
|
|
|
|
|
// 10. If pointer is null, return error with code point.
|
|
|
if (pointer === null)
|
|
|
return encoderError(code_point);
|
|
|
|
|
|
// 11. If iso-2022-jp encoder state is not jis0208, prepend code
|
|
|
// point to stream, set iso-2022-jp encoder state to jis0208,
|
|
|
// and return three bytes 0x1B 0x24 0x42.
|
|
|
if (iso2022jp_state !== states.jis0208) {
|
|
|
stream.prepend(code_point);
|
|
|
iso2022jp_state = states.jis0208;
|
|
|
return [0x1B, 0x24, 0x42];
|
|
|
}
|
|
|
|
|
|
// 12. Let lead be floor(pointer / 94) + 0x21.
|
|
|
var lead = floor(pointer / 94) + 0x21;
|
|
|
|
|
|
// 13. Let trail be pointer % 94 + 0x21.
|
|
|
var trail = pointer % 94 + 0x21;
|
|
|
|
|
|
// 14. Return two bytes whose values are lead and trail.
|
|
|
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);
|
|
|
};
|
|
|
|
|
|
// 13.3 Shift_JIS
|
|
|
|
|
|
// 13.3.1 Shift_JIS decoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Decoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function ShiftJISDecoder(options) {
|
|
|
var fatal = options.fatal;
|
|
|
// Shift_JIS's decoder has an associated Shift_JIS lead (initially
|
|
|
// 0x00).
|
|
|
var /** @type {number} */ Shift_JIS_lead = 0x00;
|
|
|
/**
|
|
|
* @param {Stream} stream The stream of bytes being decoded.
|
|
|
* @param {number} bite The next byte read from the stream.
|
|
|
* @return {?(number|!Array.<number>)} The next code point(s)
|
|
|
* decoded, or null if not enough data exists in the input
|
|
|
* stream to decode a complete code point.
|
|
|
*/
|
|
|
this.handler = function(stream, bite) {
|
|
|
// 1. If byte is end-of-stream and Shift_JIS lead is not 0x00,
|
|
|
// set Shift_JIS lead to 0x00 and return error.
|
|
|
if (bite === end_of_stream && Shift_JIS_lead !== 0x00) {
|
|
|
Shift_JIS_lead = 0x00;
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 2. If byte is end-of-stream and Shift_JIS lead is 0x00,
|
|
|
// return finished.
|
|
|
if (bite === end_of_stream && Shift_JIS_lead === 0x00)
|
|
|
return finished;
|
|
|
|
|
|
// 3. If Shift_JIS lead is not 0x00, let lead be Shift_JIS lead,
|
|
|
// let pointer be null, set Shift_JIS lead to 0x00, and then run
|
|
|
// these substeps:
|
|
|
if (Shift_JIS_lead !== 0x00) {
|
|
|
var lead = Shift_JIS_lead;
|
|
|
var pointer = null;
|
|
|
Shift_JIS_lead = 0x00;
|
|
|
|
|
|
// 1. Let offset be 0x40, if byte is less than 0x7F, and 0x41
|
|
|
// otherwise.
|
|
|
var offset = (bite < 0x7F) ? 0x40 : 0x41;
|
|
|
|
|
|
// 2. Let lead offset be 0x81, if lead is less than 0xA0, and
|
|
|
// 0xC1 otherwise.
|
|
|
var lead_offset = (lead < 0xA0) ? 0x81 : 0xC1;
|
|
|
|
|
|
// 3. If byte is in the range 0x40 to 0x7E, inclusive, or 0x80
|
|
|
// to 0xFC, inclusive, set pointer to (lead − lead offset) ×
|
|
|
// 188 + byte − offset.
|
|
|
if (inRange(bite, 0x40, 0x7E) || inRange(bite, 0x80, 0xFC))
|
|
|
pointer = (lead - lead_offset) * 188 + bite - offset;
|
|
|
|
|
|
// 4. If pointer is in the range 8836 to 10715, inclusive,
|
|
|
// return a code point whose value is 0xE000 − 8836 + pointer.
|
|
|
if (inRange(pointer, 8836, 10715))
|
|
|
return 0xE000 - 8836 + pointer;
|
|
|
|
|
|
// 5. Let code point be null, if pointer is null, and the
|
|
|
// index code point for pointer in index jis0208 otherwise.
|
|
|
var code_point = (pointer === null) ? null :
|
|
|
indexCodePointFor(pointer, index('jis0208'));
|
|
|
|
|
|
// 6. If code point is null and byte is an ASCII byte, prepend
|
|
|
// byte to stream.
|
|
|
if (code_point === null && isASCIIByte(bite))
|
|
|
stream.prepend(bite);
|
|
|
|
|
|
// 7. If code point is null, return error.
|
|
|
if (code_point === null)
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
// 8. Return a code point whose value is code point.
|
|
|
return code_point;
|
|
|
}
|
|
|
|
|
|
// 4. If byte is an ASCII byte or 0x80, return a code point
|
|
|
// whose value is byte.
|
|
|
if (isASCIIByte(bite) || bite === 0x80)
|
|
|
return bite;
|
|
|
|
|
|
// 5. If byte is in the range 0xA1 to 0xDF, inclusive, return a
|
|
|
// code point whose value is 0xFF61 − 0xA1 + byte.
|
|
|
if (inRange(bite, 0xA1, 0xDF))
|
|
|
return 0xFF61 - 0xA1 + bite;
|
|
|
|
|
|
// 6. If byte is in the range 0x81 to 0x9F, inclusive, or 0xE0
|
|
|
// to 0xFC, inclusive, set Shift_JIS lead to byte and return
|
|
|
// continue.
|
|
|
if (inRange(bite, 0x81, 0x9F) || inRange(bite, 0xE0, 0xFC)) {
|
|
|
Shift_JIS_lead = bite;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 7. Return error.
|
|
|
return decoderError(fatal);
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 13.3.2 Shift_JIS encoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Encoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function ShiftJISEncoder(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) {
|
|
|
// 1. If code point is end-of-stream, return finished.
|
|
|
if (code_point === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If code point is an ASCII code point or U+0080, return a
|
|
|
// byte whose value is code point.
|
|
|
if (isASCIICodePoint(code_point) || code_point === 0x0080)
|
|
|
return code_point;
|
|
|
|
|
|
// 3. If code point is U+00A5, return byte 0x5C.
|
|
|
if (code_point === 0x00A5)
|
|
|
return 0x5C;
|
|
|
|
|
|
// 4. If code point is U+203E, return byte 0x7E.
|
|
|
if (code_point === 0x203E)
|
|
|
return 0x7E;
|
|
|
|
|
|
// 5. If code point is in the range U+FF61 to U+FF9F, inclusive,
|
|
|
// return a byte whose value is code point − 0xFF61 + 0xA1.
|
|
|
if (inRange(code_point, 0xFF61, 0xFF9F))
|
|
|
return code_point - 0xFF61 + 0xA1;
|
|
|
|
|
|
// 6. If code point is U+2212, set it to U+FF0D.
|
|
|
if (code_point === 0x2212)
|
|
|
code_point = 0xFF0D;
|
|
|
|
|
|
// 7. Let pointer be the index Shift_JIS pointer for code point.
|
|
|
var pointer = indexShiftJISPointerFor(code_point);
|
|
|
|
|
|
// 8. If pointer is null, return error with code point.
|
|
|
if (pointer === null)
|
|
|
return encoderError(code_point);
|
|
|
|
|
|
// 9. Let lead be floor(pointer / 188).
|
|
|
var lead = floor(pointer / 188);
|
|
|
|
|
|
// 10. Let lead offset be 0x81, if lead is less than 0x1F, and
|
|
|
// 0xC1 otherwise.
|
|
|
var lead_offset = (lead < 0x1F) ? 0x81 : 0xC1;
|
|
|
|
|
|
// 11. Let trail be pointer % 188.
|
|
|
var trail = pointer % 188;
|
|
|
|
|
|
// 12. Let offset be 0x40, if trail is less than 0x3F, and 0x41
|
|
|
// otherwise.
|
|
|
var offset = (trail < 0x3F) ? 0x40 : 0x41;
|
|
|
|
|
|
// 13. Return two bytes whose values are lead + lead offset and
|
|
|
// trail + offset.
|
|
|
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);
|
|
|
};
|
|
|
|
|
|
//
|
|
|
// 14. Legacy multi-byte Korean encodings
|
|
|
//
|
|
|
|
|
|
// 14.1 euc-kr
|
|
|
|
|
|
// 14.1.1 euc-kr decoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Decoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function EUCKRDecoder(options) {
|
|
|
var fatal = options.fatal;
|
|
|
|
|
|
// euc-kr's decoder has an associated euc-kr lead (initially 0x00).
|
|
|
var /** @type {number} */ euckr_lead = 0x00;
|
|
|
/**
|
|
|
* @param {Stream} stream The stream of bytes being decoded.
|
|
|
* @param {number} bite The next byte read from the stream.
|
|
|
* @return {?(number|!Array.<number>)} The next code point(s)
|
|
|
* decoded, or null if not enough data exists in the input
|
|
|
* stream to decode a complete code point.
|
|
|
*/
|
|
|
this.handler = function(stream, bite) {
|
|
|
// 1. If byte is end-of-stream and euc-kr lead is not 0x00, set
|
|
|
// euc-kr lead to 0x00 and return error.
|
|
|
if (bite === end_of_stream && euckr_lead !== 0) {
|
|
|
euckr_lead = 0x00;
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 2. If byte is end-of-stream and euc-kr lead is 0x00, return
|
|
|
// finished.
|
|
|
if (bite === end_of_stream && euckr_lead === 0)
|
|
|
return finished;
|
|
|
|
|
|
// 3. If euc-kr lead is not 0x00, let lead be euc-kr lead, let
|
|
|
// pointer be null, set euc-kr lead to 0x00, and then run these
|
|
|
// substeps:
|
|
|
if (euckr_lead !== 0x00) {
|
|
|
var lead = euckr_lead;
|
|
|
var pointer = null;
|
|
|
euckr_lead = 0x00;
|
|
|
|
|
|
// 1. If byte is in the range 0x41 to 0xFE, inclusive, set
|
|
|
// pointer to (lead − 0x81) × 190 + (byte − 0x41).
|
|
|
if (inRange(bite, 0x41, 0xFE))
|
|
|
pointer = (lead - 0x81) * 190 + (bite - 0x41);
|
|
|
|
|
|
// 2. Let code point be null, if pointer is null, and the
|
|
|
// index code point for pointer in index euc-kr otherwise.
|
|
|
var code_point = (pointer === null)
|
|
|
? null : indexCodePointFor(pointer, index('euc-kr'));
|
|
|
|
|
|
// 3. If code point is null and byte is an ASCII byte, prepend
|
|
|
// byte to stream.
|
|
|
if (pointer === null && isASCIIByte(bite))
|
|
|
stream.prepend(bite);
|
|
|
|
|
|
// 4. If code point is null, return error.
|
|
|
if (code_point === null)
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
// 5. Return a code point whose value is code point.
|
|
|
return code_point;
|
|
|
}
|
|
|
|
|
|
// 4. If byte is an ASCII byte, return a code point whose value
|
|
|
// is byte.
|
|
|
if (isASCIIByte(bite))
|
|
|
return bite;
|
|
|
|
|
|
// 5. If byte is in the range 0x81 to 0xFE, inclusive, set
|
|
|
// euc-kr lead to byte and return continue.
|
|
|
if (inRange(bite, 0x81, 0xFE)) {
|
|
|
euckr_lead = bite;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 6. Return error.
|
|
|
return decoderError(fatal);
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 14.1.2 euc-kr encoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Encoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function EUCKREncoder(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) {
|
|
|
// 1. If code point is end-of-stream, return finished.
|
|
|
if (code_point === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If code point is an ASCII code point, return a byte whose
|
|
|
// value is code point.
|
|
|
if (isASCIICodePoint(code_point))
|
|
|
return code_point;
|
|
|
|
|
|
// 3. Let pointer be the index pointer for code point in index
|
|
|
// euc-kr.
|
|
|
var pointer = indexPointerFor(code_point, index('euc-kr'));
|
|
|
|
|
|
// 4. If pointer is null, return error with code point.
|
|
|
if (pointer === null)
|
|
|
return encoderError(code_point);
|
|
|
|
|
|
// 5. Let lead be floor(pointer / 190) + 0x81.
|
|
|
var lead = floor(pointer / 190) + 0x81;
|
|
|
|
|
|
// 6. Let trail be pointer % 190 + 0x41.
|
|
|
var trail = (pointer % 190) + 0x41;
|
|
|
|
|
|
// 7. Return two bytes whose values are lead and trail.
|
|
|
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);
|
|
|
};
|
|
|
|
|
|
|
|
|
//
|
|
|
// 15. Legacy miscellaneous encodings
|
|
|
//
|
|
|
|
|
|
// 15.1 replacement
|
|
|
|
|
|
// Not needed - API throws RangeError
|
|
|
|
|
|
// 15.2 Common infrastructure for utf-16be and utf-16le
|
|
|
|
|
|
/**
|
|
|
* @param {number} code_unit
|
|
|
* @param {boolean} utf16be
|
|
|
* @return {!Array.<number>} bytes
|
|
|
*/
|
|
|
function convertCodeUnitToBytes(code_unit, utf16be) {
|
|
|
// 1. Let byte1 be code unit >> 8.
|
|
|
var byte1 = code_unit >> 8;
|
|
|
|
|
|
// 2. Let byte2 be code unit & 0x00FF.
|
|
|
var byte2 = code_unit & 0x00FF;
|
|
|
|
|
|
// 3. Then return the bytes in order:
|
|
|
// utf-16be flag is set: byte1, then byte2.
|
|
|
if (utf16be)
|
|
|
return [byte1, byte2];
|
|
|
// utf-16be flag is unset: byte2, then byte1.
|
|
|
return [byte2, byte1];
|
|
|
}
|
|
|
|
|
|
// 15.2.1 shared utf-16 decoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Decoder}
|
|
|
* @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 {Stream} stream The stream of bytes being decoded.
|
|
|
* @param {number} bite The next byte read from the stream.
|
|
|
* @return {?(number|!Array.<number>)} The next code point(s)
|
|
|
* decoded, or null if not enough data exists in the input
|
|
|
* stream to decode a complete code point.
|
|
|
*/
|
|
|
this.handler = function(stream, bite) {
|
|
|
// 1. If byte is end-of-stream and either utf-16 lead byte or
|
|
|
// utf-16 lead surrogate is not null, set utf-16 lead byte and
|
|
|
// utf-16 lead surrogate to null, and return error.
|
|
|
if (bite === end_of_stream && (utf16_lead_byte !== null ||
|
|
|
utf16_lead_surrogate !== null)) {
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 2. If byte is end-of-stream and utf-16 lead byte and utf-16
|
|
|
// lead surrogate are null, return finished.
|
|
|
if (bite === end_of_stream && utf16_lead_byte === null &&
|
|
|
utf16_lead_surrogate === null) {
|
|
|
return finished;
|
|
|
}
|
|
|
|
|
|
// 3. If utf-16 lead byte is null, set utf-16 lead byte to byte
|
|
|
// and return continue.
|
|
|
if (utf16_lead_byte === null) {
|
|
|
utf16_lead_byte = bite;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 4. Let code unit be the result of:
|
|
|
var code_unit;
|
|
|
if (utf16_be) {
|
|
|
// utf-16be decoder flag is set
|
|
|
// (utf-16 lead byte << 8) + byte.
|
|
|
code_unit = (utf16_lead_byte << 8) + bite;
|
|
|
} else {
|
|
|
// utf-16be decoder flag is unset
|
|
|
// (byte << 8) + utf-16 lead byte.
|
|
|
code_unit = (bite << 8) + utf16_lead_byte;
|
|
|
}
|
|
|
// Then set utf-16 lead byte to null.
|
|
|
utf16_lead_byte = null;
|
|
|
|
|
|
// 5. If utf-16 lead surrogate is not null, let lead surrogate
|
|
|
// be utf-16 lead surrogate, set utf-16 lead surrogate to null,
|
|
|
// and then run these substeps:
|
|
|
if (utf16_lead_surrogate !== null) {
|
|
|
var lead_surrogate = utf16_lead_surrogate;
|
|
|
utf16_lead_surrogate = null;
|
|
|
|
|
|
// 1. If code unit is in the range U+DC00 to U+DFFF,
|
|
|
// inclusive, return a code point whose value is 0x10000 +
|
|
|
// ((lead surrogate − 0xD800) << 10) + (code unit − 0xDC00).
|
|
|
if (inRange(code_unit, 0xDC00, 0xDFFF)) {
|
|
|
return 0x10000 + (lead_surrogate - 0xD800) * 0x400 +
|
|
|
(code_unit - 0xDC00);
|
|
|
}
|
|
|
|
|
|
// 2. Prepend the sequence resulting of converting code unit
|
|
|
// to bytes using utf-16be decoder flag to stream and return
|
|
|
// error.
|
|
|
stream.prepend(convertCodeUnitToBytes(code_unit, utf16_be));
|
|
|
return decoderError(fatal);
|
|
|
}
|
|
|
|
|
|
// 6. If code unit is in the range U+D800 to U+DBFF, inclusive,
|
|
|
// set utf-16 lead surrogate to code unit and return continue.
|
|
|
if (inRange(code_unit, 0xD800, 0xDBFF)) {
|
|
|
utf16_lead_surrogate = code_unit;
|
|
|
return null;
|
|
|
}
|
|
|
|
|
|
// 7. If code unit is in the range U+DC00 to U+DFFF, inclusive,
|
|
|
// return error.
|
|
|
if (inRange(code_unit, 0xDC00, 0xDFFF))
|
|
|
return decoderError(fatal);
|
|
|
|
|
|
// 8. Return code point code unit.
|
|
|
return code_unit;
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 15.2.2 shared utf-16 encoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Encoder}
|
|
|
* @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 {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) {
|
|
|
// 1. If code point is end-of-stream, return finished.
|
|
|
if (code_point === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If code point is in the range U+0000 to U+FFFF, inclusive,
|
|
|
// return the sequence resulting of converting code point to
|
|
|
// bytes using utf-16be encoder flag.
|
|
|
if (inRange(code_point, 0x0000, 0xFFFF))
|
|
|
return convertCodeUnitToBytes(code_point, utf16_be);
|
|
|
|
|
|
// 3. Let lead be ((code point − 0x10000) >> 10) + 0xD800,
|
|
|
// converted to bytes using utf-16be encoder flag.
|
|
|
var lead = convertCodeUnitToBytes(
|
|
|
((code_point - 0x10000) >> 10) + 0xD800, utf16_be);
|
|
|
|
|
|
// 4. Let trail be ((code point − 0x10000) & 0x3FF) + 0xDC00,
|
|
|
// converted to bytes using utf-16be encoder flag.
|
|
|
var trail = convertCodeUnitToBytes(
|
|
|
((code_point - 0x10000) & 0x3FF) + 0xDC00, utf16_be);
|
|
|
|
|
|
// 5. Return a byte sequence of lead followed by trail.
|
|
|
return lead.concat(trail);
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 15.3 utf-16be
|
|
|
// 15.3.1 utf-16be decoder
|
|
|
/** @param {{fatal: boolean}} options */
|
|
|
encoders['UTF-16BE'] = function(options) {
|
|
|
return new UTF16Encoder(true, options);
|
|
|
};
|
|
|
// 15.3.2 utf-16be encoder
|
|
|
/** @param {{fatal: boolean}} options */
|
|
|
decoders['UTF-16BE'] = function(options) {
|
|
|
return new UTF16Decoder(true, options);
|
|
|
};
|
|
|
|
|
|
// 15.4 utf-16le
|
|
|
// 15.4.1 utf-16le decoder
|
|
|
/** @param {{fatal: boolean}} options */
|
|
|
encoders['UTF-16LE'] = function(options) {
|
|
|
return new UTF16Encoder(false, options);
|
|
|
};
|
|
|
// 15.4.2 utf-16le encoder
|
|
|
/** @param {{fatal: boolean}} options */
|
|
|
decoders['UTF-16LE'] = function(options) {
|
|
|
return new UTF16Decoder(false, options);
|
|
|
};
|
|
|
|
|
|
// 15.5 x-user-defined
|
|
|
|
|
|
// 15.5.1 x-user-defined decoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Decoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function XUserDefinedDecoder(options) {
|
|
|
var fatal = options.fatal;
|
|
|
/**
|
|
|
* @param {Stream} stream The stream of bytes being decoded.
|
|
|
* @param {number} bite The next byte read from the stream.
|
|
|
* @return {?(number|!Array.<number>)} The next code point(s)
|
|
|
* decoded, or null if not enough data exists in the input
|
|
|
* stream to decode a complete code point.
|
|
|
*/
|
|
|
this.handler = function(stream, bite) {
|
|
|
// 1. If byte is end-of-stream, return finished.
|
|
|
if (bite === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If byte is an ASCII byte, return a code point whose value
|
|
|
// is byte.
|
|
|
if (isASCIIByte(bite))
|
|
|
return bite;
|
|
|
|
|
|
// 3. Return a code point whose value is 0xF780 + byte − 0x80.
|
|
|
return 0xF780 + bite - 0x80;
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// 15.5.2 x-user-defined encoder
|
|
|
/**
|
|
|
* @constructor
|
|
|
* @implements {Encoder}
|
|
|
* @param {{fatal: boolean}} options
|
|
|
*/
|
|
|
function XUserDefinedEncoder(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) {
|
|
|
// 1.If code point is end-of-stream, return finished.
|
|
|
if (code_point === end_of_stream)
|
|
|
return finished;
|
|
|
|
|
|
// 2. If code point is an ASCII code point, return a byte whose
|
|
|
// value is code point.
|
|
|
if (isASCIICodePoint(code_point))
|
|
|
return code_point;
|
|
|
|
|
|
// 3. If code point is in the range U+F780 to U+F7FF, inclusive,
|
|
|
// return a byte whose value is code point − 0xF780 + 0x80.
|
|
|
if (inRange(code_point, 0xF780, 0xF7FF))
|
|
|
return code_point - 0xF780 + 0x80;
|
|
|
|
|
|
// 4. Return error with code point.
|
|
|
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 (typeof module !== "undefined" && module.exports) {
|
|
|
module.exports = {
|
|
|
TextEncoder: TextEncoder,
|
|
|
TextDecoder: TextDecoder,
|
|
|
EncodingIndexes: require("./encoding-indexes.js")["encoding-indexes"]
|
|
|
};
|
|
|
}
|
|
|
|
|
|
// For strict environments where `this` inside the global scope
|
|
|
// is `undefined`, take a pure object instead
|
|
|
}(this || {}));
|