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/** |
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* @license |
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* Copyright (c) 2020 UMI |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in all |
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* copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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'use strict' |
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/** |
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* Декодирует массив байтов UTF-8 в строку в кодировке UTF-16. |
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* @see https://developer.mozilla.org/en-US/docs/Web/API/TextDecoder |
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* @param {number[]} bytes Массив байтов UTF-8. |
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* @returns {string} |
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*/ |
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function textDecode (bytes) { |
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1 |
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let str = '' |
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1 |
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let i = 0 |
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1 |
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while (i < bytes.length) { |
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12 |
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if (bytes[i] < 0x80) { |
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str += String.fromCharCode(bytes[i++]) |
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} else if ((bytes[i] > 0xBF) && (bytes[i] < 0xE0)) { |
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str += String.fromCharCode((bytes[i++] & 0x1F) << 6 | bytes[i++] & 0x3F) |
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} else if (bytes[i] > 0xDF && bytes[i] < 0xF0) { |
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str += String.fromCharCode(((bytes[i++] & 0x0F) << 12) | ((bytes[i++] & 0x3F) << 6) | (bytes[i++] & 0x3F)) |
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} else { |
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const code = (((bytes[i++] & 0x07) << 18) | ((bytes[i++] & 0x3F) << 12) | ((bytes[i++] & 0x3F) << 6) | (bytes[i++] & 0x3F)) - 0x010000 |
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str += String.fromCharCode(code >> 10 | 0xD800, code & 0x03FF | 0xDC00) |
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} |
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} |
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return str |
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} |
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/** |
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* Кодирует UTF-16 строку в массив байтов UTF-8. |
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* @see https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder |
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* @param {string} text Текстовая строка в кодировке UTF-16. |
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* @returns {number[]} |
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*/ |
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function textEncode (text) { |
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const b = [] |
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let i = 0 |
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while (i < text.length) { |
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const code = text.charCodeAt(i++) |
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if (code < 0x80) { |
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b[b.length] = code |
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} else if (code < 0x800) { |
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b[b.length] = 0xc0 | (code >> 6) |
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b[b.length] = 0x80 | (code & 0x3f) |
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} else if (code < 0xd800 || code >= 0xe000) { |
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b[b.length] = 0xe0 | (code >> 12) |
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b[b.length] = 0x80 | ((code >> 6) & 0x3f) |
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b[b.length] = 0x80 | (code & 0x3f) |
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} else { |
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encodeUtf8Mb4(b, 0x10000 + ((code & 0x3ff) << 10) + (text.charCodeAt(i++) & 0x3ff)) |
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} |
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} |
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return b |
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} |
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/** |
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* @param {number[]} b |
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* @param {number} code |
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* @private |
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*/ |
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function encodeUtf8Mb4 (b, code) { |
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b[b.length] = 0xf0 | (code >> 18) |
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b[b.length] = 0x80 | ((code >> 12) & 0x3f) |
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b[b.length] = 0x80 | ((code >> 6) & 0x3f) |
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b[b.length] = 0x80 | (code & 0x3f) |
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} |
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1 |
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exports.textDecode = textDecode |
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exports.textEncode = textEncode |
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umi-top /
umi-core-js
