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There is a newer version: 1.20.40-r1

package cn.nukkit.network;

import cn.nukkit.api.Since;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufOutputStream;

import javax.annotation.Nonnull;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

@Since("1.4.0.0-PN")
public class LittleEndianByteBufOutputStream extends ByteBufOutputStream {

    private final ByteBuf buffer;

    @Since("1.4.0.0-PN")
    public LittleEndianByteBufOutputStream(@Nonnull ByteBuf buffer) {
        super(buffer);
        this.buffer = buffer;
    }

    @Override
    public void writeChar(int v) throws IOException {
        this.buffer.writeChar(Character.reverseBytes((char) v));
    }

    @Override
    public void writeDouble(double v) throws IOException {
        this.buffer.writeDoubleLE(v);
    }

    @Override
    public void writeFloat(float v) throws IOException {
        this.buffer.writeFloatLE(v);
    }

    @Override
    public void writeShort(int val) throws IOException {
        this.buffer.writeShortLE(val);
    }

    @Override
    public void writeLong(long val) throws IOException {
        this.buffer.writeLongLE(val);
    }

    @Override
    public void writeInt(int val) throws IOException {
        this.buffer.writeIntLE(val);
    }

    @Override
    public void writeUTF(String string) throws IOException {
        byte[] bytes = string.getBytes(StandardCharsets.UTF_8);
        this.writeShort(bytes.length);
        this.write(bytes);
    }
}