cos/memory.js

class ProcessableData {
    constructor(data, from = 0, to){
        if(data){
            this.data = data;
            this.init(from, to);
        }
    }
    /** @type {Uint8Array} */
    data = null;
    /** @type {DataView} */
    dt = null;
    /** @type {number} */
    cursor = 0;
    /**
     * @param {number} from 
     * @param {number} to 
     */
    init(from, to){
        if(this.data == null)
        {
            this.data = new Uint8Array(1024 * 1024);
        }
        this.dt = new DataView(this.data.buffer, from, to);
    }
    /** @param {number} value  */
    writeUInt8(value){
        this.dt.setUint8(this.cursor,value);
        this.cursor += 1;
    }
    /** @param {number} value  */
    writeUInt16(value){
        this.dt.setUint16(this.cursor,value);
        this.cursor += 2;
    }
    /** @param {number} value  */
    writeUInt32(value){
        this.dt.setUint32(this.cursor,value);
        this.cursor += 4;
    }
    /** @param {number} value  */
    writeInt8(value){
        this.dt.setInt8(this.cursor,value);
        this.cursor += 1;
    }
    /** @param {number} value  */
    writeInt16(value){
        this.dt.setInt16(this.cursor,value);
        this.cursor += 2;
    }
    /** @param {number} value  */
    writeInt32(value){
        this.dt.setInt32(this.cursor,value);
        this.cursor += 4;
    }
    /** @param {number} value  */
    writeFloat32(value){
        this.dt.setFloat32(this.cursor,value);
        this.cursor += 4;
    }
    /** @param {number} value  */
    writeFloat64(value){
        this.dt.setFloat64(this.cursor,value);
        this.cursor += 8;
    }
    /** @returns {number}  */
    readUInt8(){
        let value = this.dt.getUint8(this.cursor);
        this.cursor += 1;
        return value;
    }
    /** @returns {number} */
    readUInt16(){
        let value = this.dt.getUint16(this.cursor);
        this.cursor += 2;
        return value;
    }
    /** @returns {number} */
    readUInt32(){
        let value = this.dt.getUint32(this.cursor);
        this.cursor += 4;
        return value;
    }
    /** @returns {number} */
    readInt8(){
        let value = this.dt.getInt8(this.cursor);
        this.cursor += 1;
        return value;
    }
    /** @returns {number} */
    readInt16(){
        let value = this.dt.getInt16(this.cursor);
        this.cursor += 2;
        return value;
    }
    /** @returns {number} */
    readInt32(){
        let value = this.dt.getInt32(this.cursor);
        this.cursor += 4;
        return value;
    }
    /** @returns {number} */
    readFloat32(){
        let value = this.dt.getFloat32(this.cursor);
        this.cursor += 4;
        return value;
    }
    /** @returns {number} */
    readFloat64(){
        let value = this.dt.getFloat64(this.cursor);
        this.cursor += 8;
        return value;
    }

    getAllData(){
        return this.dt.buffer.slice(0, this.cursor);
    }
}

class ConstructedData extends ProcessableData {
    /** @param {string} value  */
    writeString(value){
        let encodedText = new TextEncoder().encode(value);
        for (const byte of encodedText)
        {
            this.writeUInt8(byte);
        }
    }
    /**
     * @param {number} value 
     * @returns {string}
     */
    readString(size){
        let minibuffer = this.data.buffer.slice(this.cursor, this.cursor + size);
        return new TextDecoder().decode(minibuffer);
    }
    /**
     * @param {boolean|0|1} flag1 
     * @param {boolean|0|1} flag2 
     * @param {boolean|0|1} flag3 
     * @param {boolean|0|1} flag4 
     * @param {boolean|0|1} flag5 
     * @param {boolean|0|1} flag6 
     * @param {boolean|0|1} flag7 
     * @param {boolean|0|1} flag8 
     */
    writeFlags(flag1, flag2, flag3, flag4, flag5, flag6, flag7, flag8){
        let value = (
            (flag1 << 1) |
            (flag2 << 2) |
            (flag3 << 3) |
            (flag4 << 4) |
            (flag5 << 5) |
            (flag6 << 6) |
            (flag7 << 7) |
            (flag8 << 8)
        );
        this.writeUInt8(value);
    }
    /** @returns {number[]} */
    readFlags(){
        let value = this.readUInt8();
        let result = (
            (value >> 0 & 0x1),
            (value >> 1 & 0x1),
            (value >> 2 & 0x1),
            (value >> 3 & 0x1),
            (value >> 4 & 0x1),
            (value >> 5 & 0x1),
            (value >> 6 & 0x1),
            (value >> 7 & 0x1)
        );
        return result;
    }
    /**
     * @param {number} r 
     * @param {number} g 
     * @param {number} b 
     */
    writeRGB(r,g,b){
        this.writeUInt8(r);
        this.writeUInt8(g);
        this.writeUInt8(b);
    }
    /** @returns {{r:number,g:number,b:number}} */
    readRGB(){
        return {
            r: this.readUInt8(),
            g: this.readUInt8(),
            b: this.readUInt8()
        }
    }
    /**
     * @param {number} r 
     * @param {number} g 
     * @param {number} b 
     */
    writeRGBA(r,g,b,a){
        this.writeUInt8(r);
        this.writeUInt8(g);
        this.writeUInt8(b);
        this.writeUInt8(a);
    }
    /** @returns {{r:number,g:number,b:number,a:number}} */
    readRGBA(){
        return {
            r: this.readUInt8(),
            g: this.readUInt8(),
            b: this.readUInt8(),
            a: this.readUInt8()
        }
    }
    /** @param {number} size  */
    writeVarNumber(size){
        let iszero = false;
        let isInt = Number.isInteger(size);
        let is1Byte = false;
        let is2Byte = false;
        let is4Byte = false;
        let is8Byte = false;
        let issigned = false;

        issigned = size < 0;

        if(isInt){
            if(size === 0)
            {
                iszero = true;
            }else if(size >= 0 && size <= 255)
            {
                is1Byte = true;
            }else if(size >= -127 && size <= 127)
            {
                is1Byte = true;
            }else if(size >= -32768 && size <= 32767)
            {
                is2Byte = true;
            }else if(size >= -2147483648 && size <= 2147483647)
            {
                is4Byte = true;
            }
        }else {
            if(size >= -3.4028235e38 && size <= 3.4028235e38)
            {
                is4Byte = true;
            }else {
                is8Byte = true;
            }
        };
        
        this.writeFlags(
            iszero,
            isInt,
            is1Byte,
            is2Byte,
            is4Byte,
            is8Byte,
            issigned,
            255
        );

        if(isInt == false)
        {
            if(is4Byte)
            {
                this.writeFloat32(size);
            }
            if(is8Byte)
            {
                this.writeFloat64(size);
            }
        }else{
            if(is1Byte)
            {
                if(issigned)
                {
                    this.writeInt16(size);
                }else{
                    this.writeUInt8(size);
                }
            }
            if(is2Byte)
            {
                if(issigned)
                {
                    this.writeInt32(size);
                }else{
                    this.writeUInt16(size);
                }
            }
            if(is4Byte)
            {
                if(issigned)
                {
                    this.writeInt32(size);
                }else{
                    this.writeUInt32(size);
                }
            }
        }
    }
    /** @returns {number} */
    readVarNumber(){
        let [
            iszero,
            isInt,
            is1Byte,
            is2Byte,
            is4Byte,
            is8Byte,
            issigned
        ] = this.readFlags();
    
        if(iszero)
        {
            return 0;
        }
        if(!isInt)
        {
            if(is4Byte)
            {
                return this.readFloat32(); // 32-bit float
            }else if(is8Byte)
            {
                return this.readFloat64(); // 64-bit float
            }
        }else {
            if(is1Byte)
            {
                if(issigned)
                {
                    return this.readInt8();
                }else
                {
                    return this.readUInt8();
                }
            }else if(is2Byte)
            {
                if(issigned)
                {
                    return this.readInt16();
                }else {
                    return this.readUInt16();
                }
            }else if(is4Byte)
            {
                if(issigned)
                {
                    return this.readInt32();
                }else {
                    return this.readUInt32();
                }
            }
        }
    }
    /** @param {Date|string} dateorString  */
    writeDate(dateorString){
        let date = new Date(dateorString);
        this.writeUInt32(+date);
    }
    /** @returns {Date}  */
    readDate(){
        return new Date(this.readUInt32());
    }
};