128 lines
3.5 KiB
TypeScript
128 lines
3.5 KiB
TypeScript
import { _decorator, Component, Node } from 'cc';
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const { ccclass, property } = _decorator;
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@ccclass('ReadStream')
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export class ReadStream {
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Buffer: Uint8Array;
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//当前读取位置
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Pos: number = 0;
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constructor(public buffer: Uint8Array) {
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this.Buffer = buffer;
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}
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//string转字节数组
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static StringToUint8Array(str) {
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const encoder = new TextEncoder();
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return encoder.encode(str);
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}
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//字节数组转string
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static Uint8ArrayToString(data: Uint8Array): string {
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const decoder = new TextDecoder(); // 默认使用 'utf-8' 编码
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return decoder.decode(data);
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}
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Seekg(Pos: number) {
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this.Pos = Pos;
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}
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//读取数字 默认小端序读取
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GetShort(littleEndian: boolean = true) {
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//读2个字节
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const Buf = new DataView(this.GetBufferByLength(2).buffer);
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const view = new DataView(Buf.buffer);
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return Number(view.getInt16(0, true));
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}
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GetUShort(littleEndian: boolean = true) {
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//读2个字节
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const Buf = new DataView(this.GetBufferByLength(2).buffer);
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const view = new DataView(Buf.buffer);
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return Number(view.getUint16(0, true));
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}
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//读取数字 默认小端序读取
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GetInt(littleEndian: boolean = true) {
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//读4个字节
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const Buf = new DataView(this.GetBufferByLength(4).buffer);
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return Buf.getInt32(0, littleEndian);
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}
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//读取浮点数 默认小端序读取
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GetFloat(littleEndian: boolean = true) {
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//读4个字节
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const Buf = new DataView(this.GetBufferByLength(4).buffer);
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return Buf.getFloat32(0, littleEndian);
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}
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//特殊方法
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Get256(): any {
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const Buf = Number(this.GetBufferByLength(1));
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return (256.0 + Buf) % 256.0;
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}
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//读取数字 默认小端序
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GetLongInt(littleEndian: boolean = true) {
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//读8个字节
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const Buf = this.GetBufferByLength(8);
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const view = new DataView(Buf.buffer);
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return Number(view.getBigInt64(0, true));
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}
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//读取字符串
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GetString(Length?: number) {
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if (Length) {
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//读指定字节
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const Buf = this.GetBufferByLength(Length);
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return ReadStream.Uint8ArrayToString(Buf);
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}
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else {
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for (let i = 0; i < this.Buffer.length - this.Pos; i++) {
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if (this.Buffer[i + this.Pos] == 0) {
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const truncatedArray = this.Buffer.subarray(this.Pos, i + this.Pos);
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this.Pos += i + 1;
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return ReadStream.Uint8ArrayToString(truncatedArray);
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}
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}
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}
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}
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//读取指定长度流
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GetBufferByLength(Length: number) {
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const Buf = this.Buffer.slice(this.Pos, this.Pos + Length);
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this.Pos += Length;
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return Buf;
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}
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//读取信息 通过Key
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ReadInfo(Key): string {
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let PathUA: Uint8Array = new Uint8Array(256);
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for (let i = 0; i < 256; i++) {
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PathUA[i] = this.Buffer[i + this.Pos] ^ Key[i];
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}
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// let Spos = 0;
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// for (let i = 0; i < PathUA.length; i++) {
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// if (PathUA[i] == 0) Spos = i;
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// }
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// const truncatedArray = PathUA.subarray(0, Spos);
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this.Pos += 256;
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let str = ReadStream.Uint8ArrayToString(PathUA);
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str = str.substring(0, str.indexOf(".img") + 4);
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return str;
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}
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len() {
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return this.Buffer.length;
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}
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}
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