| /** |
| ******************************************************************************* |
| * Copyright (C) 1996-2008, International Business Machines Corporation and * |
| * others. All Rights Reserved. * |
| ******************************************************************************* |
| */ |
| package com.ibm.icu.impl; |
| |
| import java.io.InputStream; |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import com.ibm.icu.util.VersionInfo; |
| |
| /** |
| * <p>Internal reader class for ICU data file uprops.icu containing |
| * Unicode codepoint data.</p> |
| * <p>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 |
| * <a href=UCharacterProperty.html>com.ibm.icu.impl.UCharacterProperty</a>. |
| * </p> |
| * <p>uprops.icu which is in big-endian format is jared together with this |
| * package.</p> |
| * |
| * 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 --------------------------------------------- |
| |
| /** |
| * <p>Protected constructor.</p> |
| * @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 ------------------------------------------------- |
| |
| /** |
| * <p>Reads uprops.icu, parse it into blocks of data to be stored in |
| * UCharacterProperty.</P |
| * @param ucharppty UCharacterProperty instance |
| * @exception IOException thrown when data reading fails |
| */ |
| protected void read(UCharacterProperty ucharppty) throws IOException |
| { |
| // read the indexes |
| int count = INDEX_SIZE_; |
| m_propertyOffset_ = m_dataInputStream_.readInt(); |
| count --; |
| m_exceptionOffset_ = m_dataInputStream_.readInt(); |
| count --; |
| m_caseOffset_ = m_dataInputStream_.readInt(); |
| count --; |
| m_additionalOffset_ = m_dataInputStream_.readInt(); |
| count --; |
| m_additionalVectorsOffset_ = m_dataInputStream_.readInt(); |
| count --; |
| m_additionalColumnsCount_ = m_dataInputStream_.readInt(); |
| count --; |
| m_reservedOffset_ = m_dataInputStream_.readInt(); |
| count --; |
| m_dataInputStream_.skipBytes(3 << 2); |
| count -= 3; |
| ucharppty.m_maxBlockScriptValue_ = m_dataInputStream_.readInt(); |
| count --; // 10 |
| ucharppty.m_maxJTGValue_ = m_dataInputStream_.readInt(); |
| count --; // 11 |
| m_dataInputStream_.skipBytes(count << 2); |
| |
| // read the trie index block |
| // m_props_index_ in terms of ints |
| ucharppty.m_trie_ = new CharTrie(m_dataInputStream_, null); |
| |
| // skip the 32 bit properties block |
| int size = m_exceptionOffset_ - m_propertyOffset_; |
| m_dataInputStream_.skipBytes(size * 4); |
| |
| // reads the 32 bit exceptions block |
| size = m_caseOffset_ - m_exceptionOffset_; |
| m_dataInputStream_.skipBytes(size * 4); |
| |
| // reads the 32 bit case block |
| size = (m_additionalOffset_ - m_caseOffset_) << 1; |
| m_dataInputStream_.skipBytes(size * 2); |
| |
| if(m_additionalColumnsCount_ > 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_}; |
| } |