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261 lines
10 KiB
Java
261 lines
10 KiB
Java
/*
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* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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*******************************************************************************
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* Copyright (C) 1996-2014, International Business Machines Corporation and
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* others. All Rights Reserved.
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*******************************************************************************
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*/
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package sun.text.normalizer;
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import java.io.BufferedInputStream;
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import java.io.DataInputStream;
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import java.io.InputStream;
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import java.io.IOException;
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import java.io.UncheckedIOException;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.util.Arrays;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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public final class ICUBinary {
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private static final class IsAcceptable implements Authenticate {
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@Override
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public boolean isDataVersionAcceptable(byte version[]) {
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return version[0] == 1;
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}
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}
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// public inner interface ------------------------------------------------
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/**
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* Special interface for data authentication
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*/
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public static interface Authenticate
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{
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/**
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* Method used in ICUBinary.readHeader() to provide data format
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* authentication.
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* @param version version of the current data
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* @return true if dataformat is an acceptable version, false otherwise
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*/
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public boolean isDataVersionAcceptable(byte version[]);
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}
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// public methods --------------------------------------------------------
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/**
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* Loads an ICU binary data file and returns it as a ByteBuffer.
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* The buffer contents is normally read-only, but its position etc. can be modified.
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*
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* @param itemPath Relative ICU data item path, for example "root.res" or "coll/ucadata.icu".
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* @return The data as a read-only ByteBuffer.
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*/
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public static ByteBuffer getRequiredData(String itemPath) {
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final Class<ICUBinary> root = ICUBinary.class;
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try (InputStream is = AccessController.doPrivileged(new PrivilegedAction<InputStream>() {
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public InputStream run() {
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return root.getResourceAsStream(itemPath);
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}
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})) {
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BufferedInputStream b=new BufferedInputStream(is, 4096 /* data buffer size */);
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DataInputStream inputStream = new DataInputStream(b);
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byte[] bb = new byte[130000];
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int n = inputStream.read(bb);
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ByteBuffer bytes = ByteBuffer.wrap(bb, 0, n);
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return bytes;
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}
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catch (IOException e) {
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throw new UncheckedIOException(e);
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}
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}
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/**
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* Same as readHeader(), but returns a VersionInfo rather than a compact int.
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*/
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public static VersionInfo readHeaderAndDataVersion(ByteBuffer bytes,
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int dataFormat,
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Authenticate authenticate)
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throws IOException {
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return getVersionInfoFromCompactInt(readHeader(bytes, dataFormat, authenticate));
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}
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private static final byte BIG_ENDIAN_ = 1;
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public static final byte[] readHeader(InputStream inputStream,
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byte dataFormatIDExpected[],
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Authenticate authenticate)
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throws IOException
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{
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DataInputStream input = new DataInputStream(inputStream);
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char headersize = input.readChar();
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int readcount = 2;
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//reading the header format
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byte magic1 = input.readByte();
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readcount ++;
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byte magic2 = input.readByte();
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readcount ++;
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if (magic1 != MAGIC1 || magic2 != MAGIC2) {
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throw new IOException(MAGIC_NUMBER_AUTHENTICATION_FAILED_);
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}
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input.readChar(); // reading size
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readcount += 2;
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input.readChar(); // reading reserved word
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readcount += 2;
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byte bigendian = input.readByte();
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readcount ++;
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byte charset = input.readByte();
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readcount ++;
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byte charsize = input.readByte();
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readcount ++;
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input.readByte(); // reading reserved byte
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readcount ++;
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byte dataFormatID[] = new byte[4];
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input.readFully(dataFormatID);
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readcount += 4;
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byte dataVersion[] = new byte[4];
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input.readFully(dataVersion);
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readcount += 4;
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byte unicodeVersion[] = new byte[4];
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input.readFully(unicodeVersion);
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readcount += 4;
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if (headersize < readcount) {
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throw new IOException("Internal Error: Header size error");
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}
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input.skipBytes(headersize - readcount);
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if (bigendian != BIG_ENDIAN_ || charset != CHAR_SET_
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|| charsize != CHAR_SIZE_
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|| !Arrays.equals(dataFormatIDExpected, dataFormatID)
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|| (authenticate != null
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&& !authenticate.isDataVersionAcceptable(dataVersion))) {
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throw new IOException(HEADER_AUTHENTICATION_FAILED_);
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}
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return unicodeVersion;
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}
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/**
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* Reads an ICU data header, checks the data format, and returns the data version.
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*
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* <p>Assumes that the ByteBuffer position is 0 on input.
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* The buffer byte order is set according to the data.
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* The buffer position is advanced past the header (including UDataInfo and comment).
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*
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* <p>See C++ ucmndata.h and unicode/udata.h.
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*
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* @return dataVersion
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* @throws IOException if this is not a valid ICU data item of the expected dataFormat
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*/
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public static int readHeader(ByteBuffer bytes, int dataFormat, Authenticate authenticate)
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throws IOException {
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assert bytes.position() == 0;
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byte magic1 = bytes.get(2);
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byte magic2 = bytes.get(3);
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if (magic1 != MAGIC1 || magic2 != MAGIC2) {
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throw new IOException(MAGIC_NUMBER_AUTHENTICATION_FAILED_);
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}
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byte isBigEndian = bytes.get(8);
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byte charsetFamily = bytes.get(9);
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byte sizeofUChar = bytes.get(10);
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if (isBigEndian < 0 || 1 < isBigEndian ||
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charsetFamily != CHAR_SET_ || sizeofUChar != CHAR_SIZE_) {
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throw new IOException(HEADER_AUTHENTICATION_FAILED_);
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}
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bytes.order(isBigEndian != 0 ? ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN);
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int headerSize = bytes.getChar(0);
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int sizeofUDataInfo = bytes.getChar(4);
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if (sizeofUDataInfo < 20 || headerSize < (sizeofUDataInfo + 4)) {
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throw new IOException("Internal Error: Header size error");
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}
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// TODO: Change Authenticate to take int major, int minor, int milli, int micro
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// to avoid array allocation.
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byte[] formatVersion = new byte[] {
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bytes.get(16), bytes.get(17), bytes.get(18), bytes.get(19)
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};
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if (bytes.get(12) != (byte)(dataFormat >> 24) ||
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bytes.get(13) != (byte)(dataFormat >> 16) ||
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bytes.get(14) != (byte)(dataFormat >> 8) ||
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bytes.get(15) != (byte)dataFormat ||
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(authenticate != null && !authenticate.isDataVersionAcceptable(formatVersion))) {
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throw new IOException(HEADER_AUTHENTICATION_FAILED_ +
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String.format("; data format %02x%02x%02x%02x, format version %d.%d.%d.%d",
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bytes.get(12), bytes.get(13), bytes.get(14), bytes.get(15),
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formatVersion[0] & 0xff, formatVersion[1] & 0xff,
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formatVersion[2] & 0xff, formatVersion[3] & 0xff));
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}
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bytes.position(headerSize);
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return // dataVersion
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((int)bytes.get(20) << 24) |
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((bytes.get(21) & 0xff) << 16) |
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((bytes.get(22) & 0xff) << 8) |
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(bytes.get(23) & 0xff);
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}
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public static void skipBytes(ByteBuffer bytes, int skipLength) {
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if (skipLength > 0) {
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bytes.position(bytes.position() + skipLength);
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}
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}
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/**
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* Returns a VersionInfo for the bytes in the compact version integer.
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*/
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public static VersionInfo getVersionInfoFromCompactInt(int version) {
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return VersionInfo.getInstance(
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version >>> 24, (version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff);
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}
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// private variables -------------------------------------------------
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/**
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* Magic numbers to authenticate the data file
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*/
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private static final byte MAGIC1 = (byte)0xda;
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private static final byte MAGIC2 = (byte)0x27;
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/**
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* File format authentication values
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*/
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private static final byte CHAR_SET_ = 0;
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private static final byte CHAR_SIZE_ = 2;
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/**
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* Error messages
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*/
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private static final String MAGIC_NUMBER_AUTHENTICATION_FAILED_ =
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"ICUBinary data file error: Magic number authentication failed";
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private static final String HEADER_AUTHENTICATION_FAILED_ =
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"ICUBinary data file error: Header authentication failed";
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}
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