org.nightcode.milter.codec.Int32LenFrameEncoder Maven / Gradle / Ivy

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Java implementation of the Sendmail Milter protocol.

There is a newer version: 0.8

/*
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.nightcode.milter.codec;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;

public class Int32LenFrameEncoder extends MessageToByteEncoder {

  @Override protected void encode(ChannelHandlerContext ctx, ByteBuf msg, ByteBuf out) {
    int length = msg.readableBytes();
    out.ensureWritable(4 + length);
    out.writeInt(length);
    out.writeBytes(msg, msg.readerIndex(), length);
  }
}