pixelstream-cn/util/stringEncodeDecode.js

基于虚幻引擎的像素流平台

export default class StringEncodeDecode{
    constructor(key){
        this.key=key;
    }

    encode(string){
        return this.base64(this.binary2Str(this.encodeBinary(this.str2binary(string),this.key)));
    }

    decode(string){
        return this.binary2Str(this.encodeBinary(this.str2binary(this.unbase64(string)),this.key));
    }

    
    str2binary(str){
        var result = [];
        var list = str.split("");
        for(var i=0;i<list.length;i++){
            if(i != 0){
                result.push(" ");
            }
            var item = list[i];
            var binaryStr = item.charCodeAt().toString(2);
            result.push(binaryStr);
        }
        return result.join("");
    }
    binary2Str(binary){
        var result = [];
        var list = binary.split(" ");
        for(var i=0;i<list.length;i++){
            var item = list[i];
            var asciiCode = parseInt(item,2);
            var charValue = String.fromCharCode(asciiCode);
            result.push(charValue);
        }
        return result.join("");
    }

    encodeBinary(binary,key){
        let binarys = binary.split("");
        let keyBinary = this.str2binary(key);
        keyBinary=keyBinary.replace(/ /g,"");
        let skip=true;
        for(let i in binarys){
            if(skip){
                skip=false;
                continue;
            }
            if(binarys[i]=="1" || binarys[i]=="0"){
                let key = keyBinary.substr((i%keyBinary.length),1);
                if(key=="1"){
                    binarys[i]=(binarys[i]=="1" ? "0" : "1");
                }
            }else{
                skip=true;
            }
        }
        let encodeBinary = binarys.join("");
        return encodeBinary;
    }
    
    base64(string){
        return string;
    }
    unbase64(string){
        return string;
    }

}