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/* |
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* Copyright (c) 2018 Rafael da Silva Rocha. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining |
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* a copy of this software and associated documentation files (the |
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* "Software"), to deal in the Software without restriction, including |
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* without limitation the rights to use, copy, modify, merge, publish, |
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* distribute, sublicense, and/or sell copies of the Software, and to |
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* permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be |
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* included in all 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, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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* |
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*/ |
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/** |
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* @fileoverview The utf8-buffer-size API. |
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* @see https://github.com/rochars/utf8-buffer-size |
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*/ |
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/** @module utf8BufferSize */ |
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/** |
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* Returns how many bytes are needed to serialize a UTF-8 string. |
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* @see https://encoding.spec.whatwg.org/#utf-8-encoder |
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* @param {string} str The string to pack. |
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* @return {number} The number of bytes needed to serialize the string. |
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*/ |
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export default function utf8BufferSize(str) { |
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/** @type {number} */ |
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let bytes = 0; |
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for (let i = 0, len = str.length; i < len; i++) { |
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/** @type {number} */ |
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let codePoint = str.codePointAt(i); |
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if (codePoint < 128) { |
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bytes++; |
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} else { |
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if (codePoint <= 2047) { |
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bytes++; |
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} else if(codePoint <= 65535) { |
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bytes+=2; |
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} else if(codePoint <= 1114111) { |
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i++; |
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bytes+=3; |
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} |
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bytes++; |
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} |
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} |
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return bytes; |
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} |
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rochars /
utf8-buffer-size
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