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The Adobe Experience Manager SDK
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/**
*******************************************************************************
* Copyright (C) 1996-2008, International Business Machines Corporation and    *
* others. All Rights Reserved.                                                *
*******************************************************************************
*/

/*
 * File: UCharacterPropertyReader.java
 * ************************************************************************
 *
 * ADOBE CONFIDENTIAL
 * ___________________
 *
 *  Copyright 2012 Adobe Systems Incorporated
 *  All Rights Reserved.
 *
 * NOTICE:  All information contained herein is, and remains
 * the property of Adobe Systems Incorporated and its suppliers,
 * if any.  The intellectual and technical concepts contained
 * herein are proprietary to Adobe Systems Incorporated and its
 * suppliers and are protected by trade secret or copyright law.
 * Dissemination of this information or reproduction of this material
 * is strictly forbidden unless prior written permission is obtained
 * from Adobe Systems Incorporated.
 **************************************************************************/
package com.adobe.agl.impl;



import java.io.InputStream;
import java.io.DataInputStream;
import java.io.IOException;
import com.adobe.agl.util.VersionInfo;

/**
* Internal reader class for ICU data file uprops.icu containing 
* Unicode codepoint data. 
* This class simply reads uprops.icu, authenticates that it is a valid
* ICU data file and split its contents up into blocks of data for use in
* com.adobe.agl.impl.UCharacterProperty.
*  
* uprops.icu which is in big-endian format is jared together with this 
* package.
*
* Unicode character properties file format see
* (ICU4C)/source/tools/genprops/store.c
*
* @author Syn Wee Quek
* @since release 2.1, February 1st 2002
*/
final class UCharacterPropertyReader implements ICUBinary.Authenticate
{
    // public methods ----------------------------------------------------
    
    public boolean isDataVersionAcceptable(byte version[])
    {
        return version[0] == DATA_FORMAT_VERSION_[0] 
               && version[2] == DATA_FORMAT_VERSION_[2] 
               && version[3] == DATA_FORMAT_VERSION_[3];
    }
    
    // protected constructor ---------------------------------------------
    
    /**
    * Protected constructor.
    * @param inputStream ICU uprop.dat file input stream
    * @exception IOException throw if data file fails authentication 
    */
    protected UCharacterPropertyReader(InputStream inputStream) 
                                                        throws IOException
    {
        m_unicodeVersion_ = ICUBinary.readHeader(inputStream, DATA_FORMAT_ID_, 
                                                 this);
        m_dataInputStream_ = new DataInputStream(inputStream);
    }
    
    // protected methods -------------------------------------------------
      
    /**
    * Reads uprops.icu, parse it into blocks of data to be stored in
    * UCharacterProperty. 0) {
            // reads the additional property block
            ucharppty.m_additionalTrie_ = new CharTrie(m_dataInputStream_, null);
                                                               
            // additional properties
            size = m_reservedOffset_ - m_additionalVectorsOffset_;
            ucharppty.m_additionalVectors_ = new int[size];
            for (int i = 0; i < size; i ++) {
                ucharppty.m_additionalVectors_[i] = m_dataInputStream_.readInt();
            }
        }

        m_dataInputStream_.close();
        ucharppty.m_additionalColumnsCount_ = m_additionalColumnsCount_;
        ucharppty.m_unicodeVersion_ = VersionInfo.getInstance(
                         (int)m_unicodeVersion_[0], (int)m_unicodeVersion_[1],
                         (int)m_unicodeVersion_[2], (int)m_unicodeVersion_[3]);
    }
    
    // private variables -------------------------------------------------
      
    /**
    * Index size
    */
    private static final int INDEX_SIZE_ = 16;
    
    /**
    * ICU data file input stream
    */
    private DataInputStream m_dataInputStream_;
      
    /**
    * Offset information in the indexes.
    */
    private int m_propertyOffset_;
    private int m_exceptionOffset_;
    private int m_caseOffset_;
    private int m_additionalOffset_;
    private int m_additionalVectorsOffset_;
    private int m_additionalColumnsCount_;
    private int m_reservedOffset_;
    private byte m_unicodeVersion_[];  
                                      
    /**
    * Data format "UPro".
    */
    private static final byte DATA_FORMAT_ID_[] = {(byte)0x55, (byte)0x50, 
                                                    (byte)0x72, (byte)0x6F};
    /**
     * Format version; this code works with all versions with the same major
     * version number and the same Trie bit distribution.
     */
    private static final byte DATA_FORMAT_VERSION_[] = {(byte)0x5, (byte)0, 
                                             (byte)Trie.INDEX_STAGE_1_SHIFT_, 
                                             (byte)Trie.INDEX_STAGE_2_SHIFT_};
}