serialize Encoder.ts

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  import { EncodingType } from './EncodingType';
import { ZlibEncoder } from './ZlibEncoder';
 
export class Encoder {
  public encode(encoding: EncodingType, data: Buffer): Buffer {
    let encoded: Buffer;
    switch (encoding) {
      case EncodingType.Raw:
        encoded = data;
        break;
      case EncodingType.ZlibDeflate:
        encoded = new ZlibEncoder().encode(data);
        break;
      default:
        throw new Error('Unknown encoding type');
    }
    return Buffer.concat([Buffer.from([encoding]), encoded]);
  }
 
  public decode(buffer: Buffer): Buffer {
    const encoding = buffer.readUInt8(0);
    const raw = buffer.slice(1);
    switch (encoding) {
      case EncodingType.Raw:
        return raw;
      case EncodingType.ZlibDeflate:
        return new ZlibEncoder().decode(raw);
      default:
        throw new Error('Unknown encoding type');
    }
  }
}