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///////////////////////////////////////////////////////////////////////////////
//                                                                             
// JTOpen (IBM Toolbox for Java - OSS version)                                 
//                                                                             
// Filename: AS400XChgRandSeedReplyDS.java
//                                                                             
// The source code contained herein is licensed under the IBM Public License   
// Version 1.0, which has been approved by the Open Source Initiative.         
// Copyright (C) 1997-2001 International Business Machines Corporation and     
// others. All rights reserved.                                                
//                                                                             
///////////////////////////////////////////////////////////////////////////////

package com.ibm.as400.access;

import java.io.IOException;
import java.io.InputStream;

// A class representing a reply to an "exchange random seed" request (class AS400XChgRandSeedDS) data stream.
class AS400XChgRandSeedReplyDS extends ClientAccessDataStream
{
  private static final String copyright = "Copyright (C) 1997-2001 International Business Machines Corporation and others.";

  
    /**
     Generate a new instance of this type.
     @return a reference to the new instance
     **/
    public Object getNewDataStream()
    {
      return new AS400XChgRandSeedReplyDS();
    }

    int getRC()
    {
        return get32bit(20);
    }

    byte[] getServerSeed()
    {
        byte[] seed = new byte[8];
        System.arraycopy(data_, 24, seed, 0, 8);
        return seed;
    }
    
    int findCP(int cp)
    {
      int offset = 32;
      while (offset < data_.length - 1)
      {
        int LLCP = get16bit(offset + 4);
        if (LLCP == cp) return offset;
        offset += get32bit(offset);
      }
      return -1;
    }

    void read(InputStream in) throws IOException
    {
        if (Trace.traceOn_) Trace.log(Trace.DIAGNOSTIC, "Receiving exchange random seeds reply..."); //@P0C

        // Receive the header.
        byte[] header = new byte[20];
        if (readFromStream(in, header, 0, 20) < 20)
        {
            if (Trace.traceOn_) Trace.log(Trace.ERROR, "Failed to read all of the exchange random seeds reply header."); //@P0C
            throw new ConnectionDroppedException(ConnectionDroppedException.CONNECTION_DROPPED);
        }

        // Allocate bytes for datastream.
        data_ = new byte[BinaryConverter.byteArrayToInt(header, 0)];
        System.arraycopy(header, 0, data_, 0, 20);

        // Read in the rest of the data.
        readAfterHeader(in);
    }

    /**
     Generates a hash code for this data stream.
     @return the hash code
     **/
    public int hashCode()
    {
      return 0xF001;
    }
 
    /**
     * Returns Important server attributes.  This field will be set to the same value that was in the request 
     * if using a pre-V5R1 system - this value must be 0.  If running V5R1 or later, this field will be set 
     * to the password level value that the system is currently using.  The values and their meaning are:
     *
     *   0 or 1- The DES (pre-V5R1) password encryption algorithm will be used.
     *   2 or 3- The SHA-1 (V5R1 and later) password encryption algorithm will be used.
     * 
     * @return serverAttributes
     */
    public byte getServerAttributes() {
      return get8bit(5); 
    }

    /**
     * Returns whether the server accepts an additional authentication factor.
     */
    boolean getAAFIndicator()
    {
        int offset = findCP(0x112E);
        return (offset == -1) ? false : (data_[offset + 6] == 0x01);
    }
    
}