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      1 //  2016 and later: Unicode, Inc. and others.
      2 // License & terms of use: http://www.unicode.org/copyright.html#License
      3 /*
      4  ******************************************************************************
      5  * Copyright (C) 2003-2015, International Business Machines Corporation and
      6  * others. All Rights Reserved.
      7  ******************************************************************************
      8  *
      9  * Created on May 2, 2003
     10  *
     11  * To change the template for this generated file go to
     12  * Window>Preferences>Java>Code Generation>Code and Comments
     13  */
     14 
     15 package com.ibm.icu.impl;
     16 
     17 import java.io.IOException;
     18 import java.nio.ByteBuffer;
     19 
     20 
     21 /**
     22  * @author ram
     23  *
     24  * To change the template for this generated type comment go to
     25  * Window>Preferences>Java>Code Generation>Code and Comments
     26  */
     27 public final class StringPrepDataReader implements ICUBinary.Authenticate {
     28     private final static boolean debug = ICUDebug.enabled("NormalizerDataReader");
     29 
     30    /**
     31     * <p>private constructor.</p>
     32     * @param bytes ICU StringPrep data file buffer
     33     * @exception IOException throw if data file fails authentication
     34     */
     35     public StringPrepDataReader(ByteBuffer bytes)
     36                                         throws IOException{
     37         if(debug) System.out.println("Bytes in buffer " + bytes.remaining());
     38 
     39         byteBuffer = bytes;
     40         unicodeVersion = ICUBinary.readHeader(byteBuffer, DATA_FORMAT_ID, this);
     41 
     42         if(debug) System.out.println("Bytes left in byteBuffer " + byteBuffer.remaining());
     43     }
     44 
     45     public char[] read(int length) throws IOException{
     46         //Read the extra data
     47         return ICUBinary.getChars(byteBuffer, length, 0);
     48     }
     49 
     50     @Override
     51     public boolean isDataVersionAcceptable(byte version[]){
     52         return version[0] == DATA_FORMAT_VERSION[0]
     53                && version[2] == DATA_FORMAT_VERSION[2]
     54                && version[3] == DATA_FORMAT_VERSION[3];
     55     }
     56     public int[] readIndexes(int length)throws IOException{
     57         int[] indexes = new int[length];
     58         //Read the indexes
     59         for (int i = 0; i <length ; i++) {
     60              indexes[i] = byteBuffer.getInt();
     61         }
     62         return indexes;
     63     }
     64 
     65     public byte[] getUnicodeVersion(){
     66         return ICUBinary.getVersionByteArrayFromCompactInt(unicodeVersion);
     67     }
     68     // private data members -------------------------------------------------
     69 
     70 
     71     /**
     72     * ICU data file input stream
     73     */
     74     private ByteBuffer byteBuffer;
     75     private int unicodeVersion;
     76     /**
     77     * File format version that this class understands.
     78     * No guarantees are made if a older version is used
     79     * see store.c of gennorm for more information and values
     80     */
     81     ///* dataFormat="SPRP" 0x53, 0x50, 0x52, 0x50  */
     82     private static final int DATA_FORMAT_ID = 0x53505250;
     83     private static final byte DATA_FORMAT_VERSION[] = {(byte)0x3, (byte)0x2,
     84                                                         (byte)0x5, (byte)0x2};
     85 }
     86