alex-frida/agent/il2cpp/hacker/struct/Il2cppString.js

import {NativeStruct} from "../../struct/NativeStruct";
import {il2cppApi} from "../../il2cppApi";

export class Il2cppString extends NativeStruct {


    static parser(systemString){
        if (systemString.isNull()){
            return"指针空";
        }
        let length = il2cppApi.il2cpp_string_length(systemString);
        let il2cppStringChars = il2cppApi.il2cpp_string_chars(systemString);
        let content="";
        for (let i = 0; i < length; i++) {
            let offset = i * 2;
            let s = il2cppStringChars.add(offset).readU16().toString(16);
            if (s.toString().length === 2) {
                let s2 = il2cppStringChars.add(offset).readCString();
                content = content + s2;
            } else {
                //转换unicode
                let unicode = "\\u" + s.toString();
                let decodeUnicode1 = this.decodeUnicode(unicode);
                content = content + decodeUnicode1;
            }
        }
        return content;
    }
    getCString() {
        if (this.isNull()){
            return "指针空";
        }
        let length = this.getLength();

        //长度4字节本身偏移16 从20位开始
        let il2cppStringChars = il2cppApi.il2cpp_string_chars(this);
        let content="";
        for (let i = 0; i < length; i++) {
            let offset = i * 2;

            let s = il2cppStringChars.add(offset).readU16().toString(16);
            // console.log("il2cppStringChars:" + s);
            //转unicode
            if (s.toString().length === 2) {
                let s2 = il2cppStringChars.add(offset).readCString();
                // log("s2:"+s2);
                content = content + s2;
            } else {
                //转换unicode
                let unicode = "\\u" + s.toString();
                // log("unicode:" + unicode);
                let decodeUnicode1 = this.decodeUnicode(unicode);
                content = content + decodeUnicode1;
                // log("s2:"+this.decodeUnicode(unicode));
            }
            // let s1 = String.fromCharCode(unicode);

        }
        if (content === undefined) {
            return "";
        }
        return content;
    }

    getLength() {
        return il2cppApi.il2cpp_string_length(this);
    }


   static  decodeUnicode(str) {
        let replace = str.replace(/\\/g, "%");
        return unescape(replace);
    }

}