1 | /* |
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2 | * Copyright (c) 2018 Rafael da Silva Rocha. |
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3 | * |
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4 | * Permission is hereby granted, free of charge, to any person obtaining |
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5 | * a copy of this software and associated documentation files (the |
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6 | * "Software"), to deal in the Software without restriction, including |
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7 | * without limitation the rights to use, copy, modify, merge, publish, |
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8 | * distribute, sublicense, and/or sell copies of the Software, and to |
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9 | * permit persons to whom the Software is furnished to do so, subject to |
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10 | * the following conditions: |
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11 | * |
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12 | * The above copyright notice and this permission notice shall be |
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13 | * included in all copies or substantial portions of the Software. |
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14 | * |
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15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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16 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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17 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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18 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
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19 | * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
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20 | * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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21 | * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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22 | * |
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23 | */ |
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24 | |||
25 | /** |
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26 | * @fileoverview The utf8-buffer-size API. |
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27 | * @see https://github.com/rochars/utf8-buffer-size |
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28 | */ |
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29 | |||
30 | /** @module utf8BufferSize */ |
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31 | |||
32 | /** |
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33 | * Returns how many bytes are needed to serialize a UTF-8 string. |
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34 | * @see https://encoding.spec.whatwg.org/#utf-8-encoder |
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35 | * @param {string} str The string to pack. |
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36 | * @return {number} The number of bytes needed to serialize the string. |
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37 | */ |
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38 | export default function utf8BufferSize(str) { |
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39 | /** @type {number} */ |
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40 | let bytes = 0; |
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41 | for (let i = 0, len = str.length; i < len; i++) { |
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42 | /** @type {number} */ |
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43 | let codePoint = str.codePointAt(i); |
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44 | if (codePoint < 128) { |
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45 | bytes++; |
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46 | } else { |
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47 | if (codePoint <= 2047) { |
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48 | bytes++; |
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49 | } else if(codePoint <= 65535) { |
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50 | bytes+=2; |
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51 | } else if(codePoint <= 1114111) { |
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52 | i++; |
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53 | bytes+=3; |
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54 | } |
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55 | bytes++; |
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56 | } |
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57 | } |
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58 | return bytes; |
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59 | } |
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60 |