package com.trilead.ssh2.packets;

import java.io.IOException;

/**
 * PacketChannelOpenFailure.
 *
 * @author Christian Plattner, plattner@trilead.com
 * @version $Id: PacketChannelOpenFailure.java,v 1.1 2007/10/15 12:49:55 cplattne Exp $
 */
public class PacketChannelOpenFailure {
    byte[] payload;

    public int recipientChannelID;
    public int reasonCode;
    public String description;
    public String languageTag;

    public PacketChannelOpenFailure(int recipientChannelID, int reasonCode, String description,
                                    String languageTag) {
        this.recipientChannelID = recipientChannelID;
        this.reasonCode = reasonCode;
        this.description = description;
        this.languageTag = languageTag;
    }

    public PacketChannelOpenFailure(byte payload[], int off, int len) throws IOException {
        this.payload = new byte[len];
        System.arraycopy(payload, off, this.payload, 0, len);
        TypesReader tr = new TypesReader(payload, off, len);
        int packet_type = tr.readByte();

        if (packet_type != Packets.SSH_MSG_CHANNEL_OPEN_FAILURE)
            throw new IOException(
                "This is not a SSH_MSG_CHANNEL_OPEN_FAILURE! ("
                + packet_type + ")");

        recipientChannelID = tr.readUINT32();
        reasonCode = tr.readUINT32();
        description = tr.readString();
        languageTag = tr.readString();

        if (tr.remain() != 0)
            throw new IOException("Padding in SSH_MSG_CHANNEL_OPEN_FAILURE packet!");
    }

    public byte[] getPayload() {
        if (payload == null) {
            TypesWriter tw = new TypesWriter();
            tw.writeByte(Packets.SSH_MSG_CHANNEL_OPEN_FAILURE);
            tw.writeUINT32(recipientChannelID);
            tw.writeUINT32(reasonCode);
            tw.writeString(description);
            tw.writeString(languageTag);
            payload = tw.getBytes();
        }

        return payload;
    }
}