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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 A minimalist buffer reader and writer. |
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* @see https://github.com/rochars/minibuffer |
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*/ |
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import {unpackFrom, packTo, unpackString, packStringTo} from 'byte-data'; |
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/** |
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* A class to read and write to buffers. |
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*/ |
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export default class MiniBuffer { |
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constructor() { |
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/** |
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* @type {number} |
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*/ |
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this.head = 0; |
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} |
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/** |
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* Read a number from a buffer. |
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* @param {!Uint8Array} buffer The bufefr. |
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* @param {!Object} typeDefinition The type definition. |
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* @param {?number=} index The index to read. |
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* @return {number} The number. |
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*/ |
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read(buffer, typeDefinition, index=null) { |
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index = index === null ? this.head : index; |
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/** @type {number} */ |
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let size = typeDefinition.bits / 8; |
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/** @type {number} */ |
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let num = unpackFrom(buffer, typeDefinition, index); |
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this.head += size + index; |
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return num; |
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} |
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/** |
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* Write a number to a buffer. |
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* @param {!Uint8Array} buffer The buffer. |
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* @param {!Object} typeDefinition The type definition. |
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* @param {number} num The number to write. |
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* @param {?number=} index The buffer index to write. |
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*/ |
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write(buffer, typeDefinition, num, index=null) { |
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index = index === null ? this.head : index; |
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/** @type {number} */ |
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let size = typeDefinition.bits / 8; |
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this.head = packTo(num, typeDefinition, buffer, index); |
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} |
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} |
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rochars /
minibuffer
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