74 lines
1.5 KiB
TypeScript
74 lines
1.5 KiB
TypeScript
// Copyright (c) Holly Stubbs (tgpholly) - Licensed under MIT
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// Check LICENSE in repository root for more information.
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export class ReaderBase {
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public buffer:Buffer;
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public offset:number;
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public constructor(buffer:Buffer) {
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this.buffer = buffer;
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this.offset = 0;
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}
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public get readOffset() {
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return this.offset;
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}
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public get length() {
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return this.buffer.length;
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}
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public readBuffer(bytes:number) {
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const value = this.buffer.subarray(this.offset, this.offset + bytes);
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this.offset += bytes;
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return value;
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}
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// NOTE: This has to be a copy as the subarray is only cropped & offset
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// Realistically this is what we want anyway.
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public readUint8Array(bytes:number) {
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const croppedBuffer = this.readBuffer(bytes);
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const newArray = new Uint8Array(croppedBuffer.length);
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for (let i = 0; i < croppedBuffer.length; i++) {
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newArray[i] = croppedBuffer[i];
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}
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return newArray;
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}
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public readByte() {
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const value = this.buffer.readInt8(this.offset);
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this.offset++;
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return value;
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}
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public readUByte() {
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const value = this.buffer.readUInt8(this.offset);
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this.offset++;
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return value;
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}
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public readBool() {
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return Boolean(this.readUByte());
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}
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public readShortString() {
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const length = this.readUByte();
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let text = "";
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for (let i = 0; i < length; i++) {
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text += String.fromCharCode(this.readUByte());
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}
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return text;
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}
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public readBytesAsString(bytesToRead:number) {
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let text = "";
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for (let i = 0; i < bytesToRead; i++) {
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text += String.fromCharCode(this.readUByte());
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}
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return text;
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}
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} |