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export class BufferWriter implements IBufferWriter {
private _data: DataView;
private _position: number;
private _length: number;
private _littleEndian: boolean;
get littleEndian(): boolean {
return this._littleEndian;
}
get length(): number {
return this._length;
}
get bytesAvailable(): number {
return this._length - this._position;
}
get position(): number {
return this._position;
}
set position(value: number) {
if (value < 0) {
throw 'out of range';
} else if (value > this._length) {
throw 'out of range';
}
this._position = value;
}
get buffer(): ArrayBuffer {
return this._data.buffer.slice(0, this._length);
}
get bufferSize(): number {
return this._data.buffer.byteLength;
}
constructor(bufferSize: number = 1024, littleEndian: boolean = false) {
this._data = new DataView(new ArrayBuffer(bufferSize));
this._position = 0;
this._length = 0;
this._littleEndian = littleEndian;
}
private allocate(bytes: number) {
const targetSize = this._position + bytes;
let size = this._data.buffer.byteLength;
if (targetSize < size) {
return;
}
while (size < targetSize) {
size *= 2;
}
const buffer = new ArrayBuffer(size);
const array = new Uint8Array(buffer);
array.set(new Uint8Array(this._data.buffer));
this._data = new DataView(buffer);
}
private movePosition(value: number) {
this._position += value;
if (this._length < this._position) {
this._length = this._position;
}
}
writeUint8(value: number) {
this.allocate(1);
this._data.setUint8(this._position, value);
this.movePosition(1);
}
writeUint16(value: number) {
this.allocate(2);
this._data.setUint16(this._position, value, this._littleEndian);
this.movePosition(2);
}
writeUint32(value: number) {
this.allocate(4);
this._data.setUint32(this._position, value, this._littleEndian);
this.movePosition(4);
}
writeUintVar(value: number) {
let next = false;
do {
let byte: number = value & 0x7f;
value /= 128;
next = value >= 1;
if (next) {
byte |= 0x80;
}
this.writeUint8(byte);
} while (next);
}
writeIntVar(value: number) {
let sign = 0;
if (value < 0) {
value = -value;
sign = 1;
}
let byte: number = ((value & 0x3f) << 1) | sign;
value /= 64;
const next = value >= 1;
if (next) {
byte |= 0x80;
}
this.writeUint8(byte);
if (next) {
this.writeUintVar(value);
}
}
writeInt8(value: number) {
this.allocate(1);
this._data.setInt8(this._position, value);
this.movePosition(1);
}
writeInt16(value: number) {
this.allocate(2);
this._data.setInt16(this._position, value, this._littleEndian);
this.movePosition(2);
}
writeInt32(value: number) {
this.allocate(4);
this._data.setInt32(this._position, value, this._littleEndian);
this.movePosition(4);
}
writeFloat32(value: number) {
this.allocate(4);
this._data.setFloat32(this._position, value, this._littleEndian);
this.movePosition(4);
}
writeFloat64(value: number) {
this.allocate(8);
this._data.setFloat64(this._position, value, this._littleEndian);
this.movePosition(8);
}
writeString(value: string) {
this.writeUintVar(value.length);
for (let i = 0; i < value.length; i++) {
this.writeUintVar(value.charCodeAt(i));
}
}
writeBigInt(value: bigint) {
let sign = 1;
if (value < 0) {
sign = -1;
value = -value;
}
let temp = value;
let count = 0;
while (temp) {
temp >>= 8n;
count++;
}
this.writeIntVar(sign * count);
while (value) {
const byte = value & 255n;
this.writeUint8(Number(byte));
value >>= 8n;
}
}
writeBuffer(value: ArrayBuffer) {
this.writeUintVar(value.byteLength);
this.allocate(value.byteLength);
const array = new Uint8Array(this._data.buffer);
array.set(new Uint8Array(value), this._position);
this.movePosition(value.byteLength);
}
writeFlags(value: boolean[]) {
let bitset = 0;
for (let i = 0; i < value.length; i++) {
if (value[i]) {
bitset |= 2 ** i;
}
}
this.writeUintVar(bitset);
}
writeBitset(value: boolean[]) {
let bitset = 0;
let position = 0;
for (let i = 0; i < value.length; i++) {
if (value[i]) {
bitset |= 2 ** position;
}
position++;
if (position === 8) {
this.writeUint8(bitset);
bitset = 0;
position = 0;
}
}
if (position) {
this.writeUint8(bitset);
}
}
}
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