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osu-buffer.js
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osu-buffer.js
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'use strict';
const Long = require("long");
class OsuBuffer {
/**
* @param input
*/
constructor(input) {
this.buffer = Buffer.from((input instanceof Buffer) ? input : []);
this.position = 0;
}
/**
* Returns the full length of the buffer
* @returns {Number}
*/
get length() {
return this.buffer.length;
}
/**
* Returns buffer to a binary string
* @returns {String}
*/
toString(type = 'binary') {
return this.buffer.toString(type);
}
/**
* Creates a new OsuBuffer from arguments
* @returns {OsuBuffer}
*/
static from() {
if (arguments[0] instanceof OsuBuffer) {
arguments[0] = arguments[0].buffer;
}
return new OsuBuffer(Buffer.from.apply(Buffer, arguments));
}
/**
* Returns boolean if can read from defined length from buffer
* @param {Number} length
* @return {boolean}
*/
canRead(length) {
return length + this.position <= this.buffer.length;
}
/**
* Returns boolean if at end of the buffer
* @return {boolean}
*/
EOF() {
return this.position >= this.buffer.length;
}
/**
* Slices and returns buffer
* @param {Number} length
* @param {Boolean?} asOsuBuffer
* @return {OsuBuffer|Buffer}
*/
Slice(length, asOsuBuffer = true) {
this.position += length;
return asOsuBuffer ? OsuBuffer.from(this.buffer.slice(this.position - length, this.position))
: this.buffer.slice(this.position - length, this.position);
}
// Reading
/**
* Peeks the next byte in the buffer without shifting the position
* @return {Number|undefined}
*/
Peek() {
return this.buffer[this.position+1];
}
/**
* Reads a byte from the buffer
* Does the same thing as ReadUInt8()
* @return {Number}
*/
ReadByte() {
return this.ReadUInt8();
}
/**
* Reads a signed integer from the Buffer
* @param {Number} byteLength
* @return {Number}
*/
ReadInt(byteLength) {
this.position += byteLength;
return this.buffer.readIntLE(this.position - byteLength, byteLength);
}
/**
* Reads a unsigned integer from the Buffer
* @param {Number} byteLength
* @return {Number}
*/
ReadUInt(byteLength) {
this.position += byteLength;
return this.buffer.readUIntLE(this.position - byteLength, byteLength);
}
/**
* Reads a 8-bit signed integer from the buffer
* @return {Number}
*/
ReadInt8() {
return this.ReadInt(1);
}
/**
* Reads a 8-bit unsigned integer from the buffer
* @return {Number}
*/
ReadUInt8() {
return this.ReadUInt(1);
}
/**
* Reads a 16-bit signed integer from the buffer
* @return {Number}
*/
ReadInt16() {
return this.ReadInt(2);
}
/**
* Reads a 16-bit unsigned integer from the buffer
* @return {Number}
*/
ReadUInt16() {
return this.ReadUInt(2);
}
/**
* Reads a 32-bit signed integer from the buffer
* @return {Number}
*/
ReadInt32() {
return this.ReadInt(4);
}
/**
* Reads a 32-bit signed unsigned from the buffer
* @return {Number}
*/
ReadUInt32() {
return this.ReadUInt(4);
}
/**
* Reads a 64-bit signed integer from the buffer
* @return {Number}
*/
ReadInt64() {
return (this.ReadInt(4) << 8) + this.ReadInt(4);
}
/**
* Reads a .NET DateTime ticks
* @return {String}
*/
ReadOsuDateTime() {
const l1 = this.ReadInt32();
const l2 = this.ReadInt32();
return new Long(l1, l2).toString();
}
/**
* Reads a 64-bit signed unsigned from the buffer
* @return {Number}
*/
ReadUInt64() {
return (this.ReadUInt(4) << 8) + this.ReadUInt(4);
}
/**
* Reads a 32-bit Float from the buffer
* @returns {Number}
*/
ReadFloat() {
this.position += 4;
return this.buffer.readFloatLE(this.position - 4);
}
/**
* Reads a 64-bit Double from the buffer
* @returns {Number}
*/
ReadDouble() {
this.position += 8;
return this.buffer.readDoubleLE(this.position - 8);
}
/**
* Reads a string from the buffer
* @param {Number} length
* @returns {String}
*/
ReadString(length) {
return this.Slice(length, false).toString();
}
/**
* Decodes a 7-bit encoded integer from the buffer
* @returns {Number}
*/
ReadVarint() {
let total = 0;
let shift = 0;
let byte = this.ReadUInt8();
if((byte & 0x80) === 0) {
total |= ((byte & 0x7F) << shift);
} else {
let end = false;
do {
if(shift) {
byte = this.ReadUInt8();
}
total |= ((byte & 0x7F) << shift);
if((byte & 0x80) === 0) end = true;
shift += 7;
} while (!end);
}
return total;
}
/**
* Decodes a 7-bit encoded integer from the buffer
* @deprecated Use ReadVarint instead
* @returns {Number}
*/
ReadULeb128() {
return this.ReadVarint();
}
/**
* Reads a byte from buffer and converts to boolean
* @return {boolean}
*/
ReadBoolean() {
return Boolean(this.ReadInt(1));
}
/**
* Reads an osu! encoded string from the Buffer
* @returns {string}
*/
ReadOsuString() {
let isString = this.ReadByte() === 11;
if(isString) {
let len = this.ReadVarint();
return this.ReadString(len);
} else {
return '';
}
}
// Writing
/**
* Concats a buffer to the current buffer
* @param {Buffer} value
* @return {OsuBuffer}
*/
WriteBuffer(value) {
this.buffer = Buffer.concat([this.buffer, value]);
return this;
}
/**
* Writes an unsinged integer of any byte length
* @param {Number} value
* @param {Number} byteLength
* @return {OsuBuffer}
*/
WriteUInt(value, byteLength) {
let buff = Buffer.alloc(byteLength);
buff.writeUIntLE(value, 0, byteLength);
return this.WriteBuffer(buff);
}
/**
* Writes an integer of any byte length
* @param {Number} value
* @param {Number} byteLength
* @return {OsuBuffer}
*/
WriteInt(value, byteLength) {
let buff = Buffer.alloc(byteLength);
buff.writeIntLE(value, 0, byteLength);
return this.WriteBuffer(buff);
}
/**
* Writes a 8-bit integer to the Buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteByte(value) {
return this.WriteBuffer(Buffer.alloc(1, value));
}
/**
*
* @param {Array} value
* @return {OsuBuffer}
*/
WriteBytes(value) {
return this.WriteBuffer(Buffer.from(value));
}
/**
* Writes a 8-bit integer to the Buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteUInt8(value) {
return this.WriteUInt(value, 1);
}
/**
* Writes a 8-bit integer to the Buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteInt8(value) {
return this.WriteInt(value, 1);
}
/**
* Writes a 16-bit unsigned integer to the Buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteUInt16(value) {
return this.WriteUInt(value, 2);
}
/**
* Writes a 16-bit signed integer to the Buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteInt16(value) {
return this.WriteInt(value, 2);
}
/**
* Writes a 32-bit unsigned integer to the Buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteUInt32(value) {
return this.WriteUInt(value, 4);
}
/**
* Writes a 32-bit signed integer to the Buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteInt32(value) {
return this.WriteInt(value, 4);
}
/**
* Writes a 64-bit unsigned integer to the Buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteUInt64(value) {
let buff = Buffer.alloc(8);
// High
buff.writeUInt32LE(value >> 8, 0);
// Low
buff.writeUInt32LE(value & 0x00ff, 4);
return this.WriteBuffer(buff);
}
/**
* Writes a 64-bit signed integer to the Buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteInt64(value) {
let buff = Buffer.alloc(8);
// High
buff.writeInt32LE(value >> 8, 0);
// Low
buff.writeInt32LE(value & 0x00ff, 4);
return this.WriteBuffer(buff);
}
/**
* Writes a 32-bit float to the buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteFloat(value) {
let buff = Buffer.alloc(4);
buff.writeFloatLE(value, 0);
return this.WriteBuffer(buff);
}
/**
* Writes a 64-bit double to the buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteDouble(value) {
let buff = Buffer.alloc(8);
buff.writeDoubleLE(value, 0);
return this.WriteBuffer(buff);
}
/**
* Writes a string to the Buffer
* @param {string} value
* @return {OsuBuffer}
*/
WriteString(value) {
let buff = Buffer.alloc(Buffer.byteLength(value, 'utf8'));
buff.write(value);
return this.WriteBuffer(buff);
}
/**
* Writes a boolean to the buffer
* @param {boolean} value
* @return {OsuBuffer}
*/
WriteBoolean(value) {
return this.WriteByte(value ? 1 : 0);
}
/**
* Writes an osu! encoded string to the Buffer
* @param {string?} value
* @param nullable
* @return {OsuBuffer}
*/
WriteOsuString(value, nullable = false) {
if(value.length === 0 && nullable)
{
this.WriteByte(0);
} else if(value.length === 0)
{
this.WriteByte(11);
this.WriteByte(0);
} else {
this.WriteByte(11);
this.WriteVarint(Buffer.byteLength(value, 'utf8'));
this.WriteString(value);
}
return this;
}
/**
* Writes an unsigned 7-bit encoded integer to the Buffer
* @param {Number} value
* @return {OsuBuffer}
*/
WriteVarint(value) {
let arr = [];
let len = 0;
do {
arr[len] = value & 0x7F;
if ((value >>= 7) !== 0) arr[len] |= 0x80;
len++;
} while (value > 0);
return this.WriteBuffer(Buffer.from(arr));
}
/**
* Writes an unsigned 7-bit encoded integer to the Buffer
* @deprecated Use WriteUVarint instead
* @param {Number} value
* @return {OsuBuffer}
*/
WriteULeb128(value) {
return this.WriteVarint(value);
}
}
module.exports = OsuBuffer;