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) 1996-2015, International Business Machines Corporation and 6 * others. All Rights Reserved. 7 ******************************************************************************* 8 */ 9 10 package com.ibm.icu.impl; 11 12 import java.io.IOException; 13 import java.nio.ByteBuffer; 14 import java.util.Arrays; 15 16 /** 17 * <p>Internal reader class for ICU data file uname.dat containing 18 * Unicode codepoint name data.</p> 19 * <p>This class simply reads unames.icu, authenticates that it is a valid 20 * ICU data file and split its contents up into blocks of data for use in 21 * <a href=UCharacterName.html>com.ibm.icu.impl.UCharacterName</a>. 22 * </p> 23 * <p>unames.icu which is in big-endian format is jared together with this 24 * package.</p> 25 * @author Syn Wee Quek 26 * @since release 2.1, February 1st 2002 27 */ 28 29 final class UCharacterNameReader implements ICUBinary.Authenticate 30 { 31 // public methods ---------------------------------------------------- 32 33 @Override 34 public boolean isDataVersionAcceptable(byte version[]) 35 { 36 return version[0] == 1; 37 } 38 39 // protected constructor --------------------------------------------- 40 41 /** 42 * <p>Protected constructor.</p> 43 * @param bytes ICU uprop.dat file buffer 44 * @exception IOException throw if data file fails authentication 45 */ 46 protected UCharacterNameReader(ByteBuffer bytes) throws IOException 47 { 48 ICUBinary.readHeader(bytes, DATA_FORMAT_ID_, this); 49 m_byteBuffer_ = bytes; 50 } 51 52 // protected methods ------------------------------------------------- 53 54 /** 55 * Read and break up the stream of data passed in as arguments 56 * and fills up UCharacterName. 57 * If unsuccessful false will be returned. 58 * @param data instance of datablock 59 * @exception IOException thrown when there's a data error. 60 */ 61 protected void read(UCharacterName data) throws IOException 62 { 63 // reading index 64 m_tokenstringindex_ = m_byteBuffer_.getInt(); 65 m_groupindex_ = m_byteBuffer_.getInt(); 66 m_groupstringindex_ = m_byteBuffer_.getInt(); 67 m_algnamesindex_ = m_byteBuffer_.getInt(); 68 69 // reading tokens 70 int count = m_byteBuffer_.getChar(); 71 char token[] = ICUBinary.getChars(m_byteBuffer_, count, 0); 72 int size = m_groupindex_ - m_tokenstringindex_; 73 byte tokenstr[] = new byte[size]; 74 m_byteBuffer_.get(tokenstr); 75 data.setToken(token, tokenstr); 76 77 // reading the group information records 78 count = m_byteBuffer_.getChar(); 79 data.setGroupCountSize(count, GROUP_INFO_SIZE_); 80 count *= GROUP_INFO_SIZE_; 81 char group[] = ICUBinary.getChars(m_byteBuffer_, count, 0); 82 83 size = m_algnamesindex_ - m_groupstringindex_; 84 byte groupstring[] = new byte[size]; 85 m_byteBuffer_.get(groupstring); 86 87 data.setGroup(group, groupstring); 88 89 count = m_byteBuffer_.getInt(); 90 UCharacterName.AlgorithmName alg[] = 91 new UCharacterName.AlgorithmName[count]; 92 93 for (int i = 0; i < count; i ++) 94 { 95 UCharacterName.AlgorithmName an = readAlg(); 96 if (an == null) { 97 throw new IOException("unames.icu read error: Algorithmic names creation error"); 98 } 99 alg[i] = an; 100 } 101 data.setAlgorithm(alg); 102 } 103 104 /** 105 * <p>Checking the file for the correct format.</p> 106 * @param dataformatid 107 * @param dataformatversion 108 * @return true if the file format version is correct 109 */ 110 ///CLOVER:OFF 111 protected boolean authenticate(byte dataformatid[], 112 byte dataformatversion[]) 113 { 114 return Arrays.equals( 115 ICUBinary.getVersionByteArrayFromCompactInt(DATA_FORMAT_ID_), 116 dataformatid) && 117 isDataVersionAcceptable(dataformatversion); 118 } 119 ///CLOVER:ON 120 121 // private variables ------------------------------------------------- 122 123 /** 124 * Byte buffer for names 125 */ 126 private ByteBuffer m_byteBuffer_; 127 /** 128 * Size of the group information block in number of char 129 */ 130 private static final int GROUP_INFO_SIZE_ = 3; 131 132 /** 133 * Index of the offset information 134 */ 135 private int m_tokenstringindex_; 136 private int m_groupindex_; 137 private int m_groupstringindex_; 138 private int m_algnamesindex_; 139 140 /** 141 * Size of an algorithmic name information group 142 * start code point size + end code point size + type size + variant size + 143 * size of data size 144 */ 145 private static final int ALG_INFO_SIZE_ = 12; 146 147 /** 148 * File format id that this class understands. 149 */ 150 private static final int DATA_FORMAT_ID_ = 0x756E616D; 151 152 // private methods --------------------------------------------------- 153 154 /** 155 * Reads an individual record of AlgorithmNames 156 * @return an instance of AlgorithNames if read is successful otherwise null 157 * @exception IOException thrown when file read error occurs or data is corrupted 158 */ 159 private UCharacterName.AlgorithmName readAlg() throws IOException 160 { 161 UCharacterName.AlgorithmName result = 162 new UCharacterName.AlgorithmName(); 163 int rangestart = m_byteBuffer_.getInt(); 164 int rangeend = m_byteBuffer_.getInt(); 165 byte type = m_byteBuffer_.get(); 166 byte variant = m_byteBuffer_.get(); 167 if (!result.setInfo(rangestart, rangeend, type, variant)) { 168 return null; 169 } 170 171 int size = m_byteBuffer_.getChar(); 172 if (type == UCharacterName.AlgorithmName.TYPE_1_) 173 { 174 char factor[] = ICUBinary.getChars(m_byteBuffer_, variant, 0); 175 176 result.setFactor(factor); 177 size -= (variant << 1); 178 } 179 180 StringBuilder prefix = new StringBuilder(); 181 char c = (char)(m_byteBuffer_.get() & 0x00FF); 182 while (c != 0) 183 { 184 prefix.append(c); 185 c = (char)(m_byteBuffer_.get() & 0x00FF); 186 } 187 188 result.setPrefix(prefix.toString()); 189 190 size -= (ALG_INFO_SIZE_ + prefix.length() + 1); 191 192 if (size > 0) 193 { 194 byte string[] = new byte[size]; 195 m_byteBuffer_.get(string); 196 result.setFactorString(string); 197 } 198 return result; 199 } 200 } 201
