package net.minecraft.network;

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

@Sharable
public class Varint21LengthFieldPrepender extends MessageToByteEncoder<ByteBuf> {
    public static final int MAX_VARINT21_BYTES = 3;

    protected void encode(ChannelHandlerContext p_130571_, ByteBuf p_130572_, ByteBuf p_130573_) {
        int i = p_130572_.readableBytes();
        int j = VarInt.getByteSize(i);
        if (j > 3) {
            throw new EncoderException("Packet too large: size " + i + " is over 8");
        } else {
            p_130573_.ensureWritable(j + i);
            VarInt.write(p_130573_, i);
            p_130573_.writeBytes(p_130572_, p_130572_.readerIndex(), i);
        }
    }
}