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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 Read and write to buffers. |
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* @see https://github.com/rochars/wavefile |
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*/ |
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import {unpackFrom, unpackString, packString} from '../vendor/byte-data.js'; |
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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 BufferIO { |
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constructor() { |
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/** |
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* @type {number} |
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* @private |
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*/ |
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this.head_ = 0; |
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} |
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/** |
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* Write a variable size string as bytes. If the string is smaller |
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* than the max size the output array is filled with 0s. |
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* @param {string} str The string to be written as bytes. |
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* @param {number} maxSize the max size of the string. |
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* @return {!Array<number>} The bytes. |
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* @private |
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*/ |
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writeString_(str, maxSize, push=true) { |
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/** @type {!Array<number>} */ |
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let bytes = packString(str); |
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if (push) { |
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for (let i=bytes.length; i<maxSize; i++) { |
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bytes.push(0); |
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} |
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} |
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return bytes; |
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} |
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/** |
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* Read bytes as a ZSTR string. |
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* @param {!Uint8Array} bytes The bytes. |
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* @return {string} The string. |
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* @private |
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*/ |
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readZSTR_(bytes, index=0) { |
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/** @type {string} */ |
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let str = ''; |
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for (let i=index; i<bytes.length; i++) { |
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this.head_++; |
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if (bytes[i] === 0) { |
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break; |
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} |
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str += unpackString(bytes, i, 1); |
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} |
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return str; |
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} |
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/** |
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* Read bytes as a string from a RIFF chunk. |
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* @param {!Uint8Array} bytes The bytes. |
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* @param {number} maxSize the max size of the string. |
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* @return {string} The string. |
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* @private |
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*/ |
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readString_(bytes, maxSize) { |
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/** @type {string} */ |
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let str = ''; |
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for (let i=0; i<maxSize; i++) { |
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str += unpackString(bytes, this.head_, 1); |
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this.head_++; |
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} |
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return str; |
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} |
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/** |
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* Read a number from a chunk. |
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* @param {!Uint8Array} bytes The chunk bytes. |
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* @param {!Object} bdType The type definition. |
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* @return {number} The number. |
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* @private |
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*/ |
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read_(bytes, bdType) { |
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/** @type {number} */ |
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let size = bdType.bits / 8; |
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/** @type {number} */ |
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let value = unpackFrom(bytes, bdType, this.head_); |
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this.head_ += size; |
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return value; |
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} |
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} |
rochars /
wavefile
