# All files / lib/messages ScriptWitnessV0.ts

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     import { BufferReader, BufferWriter } from '@node-dlc/bufio';

    /**
     * ScriptWitness is the data for a witness element in a witness stack.
     * An empty witness_stack is an error, as every input must be Segwit.
     * Witness elements should not include their length as part of the witness
     * data.
     */
    export class ScriptWitnessV0 {
      /**
       * Deserializes an script_witness_v0 message
       * @param buf
       */
      public static deserialize(buf: Buffer): ScriptWitnessV0 {
        const instance = new ScriptWitnessV0();
        const reader = new BufferReader(buf);

        instance.length = Number(reader.readBigSize());
        instance.witness = reader.readBytes(instance.length);

        return instance;
      }

      public static getWitness(reader: BufferReader): Buffer {
        const length = Number(reader.readBigSize());
        const body = reader.readBytes(Number(length));

        const writer = new BufferWriter();
        writer.writeBigSize(length);
        writer.writeBytes(body);

        return writer.toBuffer();
      }

      public length: number;

      public witness: Buffer;

      /**
       * Converts script_witness_v0 to JSON
       */
      public toJSON(): IScriptWitnessV0JSON {
        return {
          witness: this.witness.toString('hex'),
        };
      }

      /**
       * Serializes the script_witness_v0 message into a Buffer
       */
      public serialize(): Buffer {
        const writer = new BufferWriter();

        writer.writeBigSize(this.witness.length);
        writer.writeBytes(this.witness);

        return writer.toBuffer();
      }
    }

    export interface IScriptWitnessV0JSON {
      witness: string;
    }