/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * particular file as subject to the "Classpath" exception as provided

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

/*

/*

 ******************************************************************************

 * Copyright (C) 2003, International Business Machines Corporation and   *

 * others. All Rights Reserved.                                               *

 ******************************************************************************

 *

 * Created on May 2, 2003

 *

 * To change the template for this generated file go to

 * Window>Preferences>Java>Code Generation>Code and Comments

 */

// CHANGELOG

//      2005-05-19 Edward Wang

//          - copy this file from icu4jsrc_3_2/src/com/ibm/icu/impl/StringPrepDataReader.java

//          - move from package com.ibm.icu.impl to package sun.net.idn

//

package sun.net.idn;

import java.io.DataInputStream;

import java.io.IOException;

import java.io.InputStream;

import sun.text.normalizer.ICUBinary;

/**

 * @author ram

 *

 * To change the template for this generated type comment go to

 * Window>Preferences>Java>Code Generation>Code and Comments

 */

final class StringPrepDataReader implements ICUBinary.Authenticate {

   /**

    * <p>private constructor.</p>

    * @param inputStream ICU uprop.dat file input stream

    * @exception IOException throw if data file fails authentication

    * @draft 2.1

    */

    public StringPrepDataReader(InputStream inputStream)

                                        throws IOException{

        unicodeVersion = ICUBinary.readHeader(inputStream, DATA_FORMAT_ID, this);

        dataInputStream = new DataInputStream(inputStream);

    }

    public void read(byte[] idnaBytes,

                        char[] mappingTable)

                        throws IOException{

        //Read the bytes that make up the idnaTrie

        dataInputStream.read(idnaBytes);

        //Read the extra data

        for(int i=0;i<mappingTable.length;i++){

            mappingTable[i]=dataInputStream.readChar();

        }

    }

    public byte[] getDataFormatVersion(){

        return DATA_FORMAT_VERSION;

    }

    public boolean isDataVersionAcceptable(byte version[]){

        return version[0] == DATA_FORMAT_VERSION[0]

               && version[2] == DATA_FORMAT_VERSION[2]

               && version[3] == DATA_FORMAT_VERSION[3];

    }

    public int[] readIndexes(int length)throws IOException{

        int[] indexes = new int[length];

        //Read the indexes

        for (int i = 0; i <length ; i++) {

             indexes[i] = dataInputStream.readInt();

        }

        return indexes;

    }

    public byte[] getUnicodeVersion(){

        return unicodeVersion;

    }

    // private data members -------------------------------------------------

    /**

    * ICU data file input stream

    */

    private DataInputStream dataInputStream;

    private byte[] unicodeVersion;

    /**

    * File format version that this class understands.

    * No guarantees are made if a older version is used

    * see store.c of gennorm for more information and values

    */

    ///* dataFormat="SPRP" 0x53, 0x50, 0x52, 0x50  */

    private static final byte DATA_FORMAT_ID[] = {(byte)0x53, (byte)0x50,

                                                    (byte)0x52, (byte)0x50};

    private static final byte DATA_FORMAT_VERSION[] = {(byte)0x3, (byte)0x2,

                                                        (byte)0x5, (byte)0x2};

}