95 lines
2.3 KiB
JavaScript
95 lines
2.3 KiB
JavaScript
/*
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MIT License
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Copyright (c) 2023 Michael Smith <root@retrospace.be>
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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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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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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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// NOTE(m): Partially copied from
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// https://github.com/steffest/DPaint-js/blob/master/_script/util/binarystream.js
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class BinaryStream {
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constructor(arrayBuffer) {
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this.index = 0;
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this.data = arrayBuffer;
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this.dataView = new DataView(arrayBuffer);
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this.length = arrayBuffer.byteLength;
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}
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EOF() {
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return this.index === this.length;
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}
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jump(offset) {
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this.index += offset;
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}
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readByte() {
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const byte = this.dataView.getUint8(this.index);
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this.index++;
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return byte;
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}
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readInt16BE() {
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const value = this.dataView.getInt16(this.index);
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this.index += 2;
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return value;
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}
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readString(length) {
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let string = "";
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for (let i = 0; i < length; i++) {
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const byte = this.dataView.getUint8(this.index + i);
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string += String.fromCharCode(byte);
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}
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this.index += length;
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return string;
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}
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readUint8() {
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const value = this.dataView.getUint8(this.index);
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this.index += 1;
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return value;
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}
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readUint16BE() {
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const value = this.dataView.getUint16(this.index);
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this.index += 2;
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return value;
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}
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readUint32BE() {
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const value = this.dataView.getUint32(this.index);
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this.index += 4;
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return value;
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}
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}
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export default BinaryStream;
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