112 lines
2.9 KiB
TypeScript
112 lines
2.9 KiB
TypeScript
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class UhkBuffer {
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buffer: Buffer;
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offset: number;
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private static maxStringByteLength = 0xFFFF;
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private static longStringPrefix = 0xFF;
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private static stringEncoding = 'utf8';
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constructor(buffer:Buffer) {
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this.offset = 0;
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this.buffer = buffer;
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}
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readInt8():number {
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let value = this.buffer.readInt8(this.offset);
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this.offset += 1;
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return value;
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}
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writeInt8(value:number):void {
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this.buffer.writeInt8(value, this.offset);
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this.offset += 1;
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}
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readUInt8():number {
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let value = this.buffer.readUInt8(this.offset);
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this.offset += 1;
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return value;
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}
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writeUInt8(value:number):void {
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this.buffer.writeUInt8(value, this.offset);
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this.offset += 1;
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}
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readInt16():number {
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let value = this.buffer.readInt16LE(this.offset);
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this.offset += 2;
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return value;
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}
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writeInt16(value:number):void {
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this.buffer.writeInt16LE(value, this.offset);
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this.offset += 2;
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}
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readUInt16():number {
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let value = this.buffer.readUInt16LE(this.offset);
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this.offset += 2;
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return value;
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}
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writeUInt16(value:number):void {
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this.buffer.writeUInt16LE(value, this.offset);
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this.offset += 2;
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}
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readInt32():number {
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let value = this.buffer.readInt32LE(this.offset);
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this.offset += 4;
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return value;
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}
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writeInt32(value:number):void {
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this.buffer.writeInt32LE(value, this.offset);
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this.offset += 4;
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}
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readUInt32():number {
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let value = this.buffer.readUInt32LE(this.offset);
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this.offset += 4;
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return value;
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}
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writeUInt32(value:number):void {
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this.buffer.writeUInt32LE(value, this.offset);
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this.offset += 4;
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}
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readString():string {
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let stringByteLength = this.readUInt8();
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if (stringByteLength == UhkBuffer.longStringPrefix) {
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stringByteLength += this.readUInt8() << 8;
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}
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let string = this.buffer.toString(UhkBuffer.stringEncoding, this.offset, stringByteLength);
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this.offset += stringByteLength;
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return string;
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}
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writeString(string:string):void {
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let stringByteLength = Buffer.byteLength(string, UhkBuffer.stringEncoding);
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if (stringByteLength > UhkBuffer.maxStringByteLength) {
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throw 'Cannot serialize string: ${stringByteLength} bytes is larger ' +
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'than the maximum allowed length of ${UhkBuffer.maxStringByteLength} bytes';
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}
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if (stringByteLength >= UhkBuffer.longStringPrefix) {
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this.writeUInt8(UhkBuffer.longStringPrefix);
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this.writeUInt16(stringByteLength);
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} else {
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this.writeUInt8(stringByteLength);
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}
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this.buffer.write(string, this.offset, stringByteLength, UhkBuffer.stringEncoding);
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this.offset += stringByteLength;
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}
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}
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