| /* |
| * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| ******************************************************************************* |
| * Copyright (C) 1996-2014, International Business Machines Corporation and |
| * others. All Rights Reserved. |
| ******************************************************************************* |
| */ |
| |
| package sun.text.normalizer; |
| |
| import java.io.BufferedInputStream; |
| import java.io.DataInputStream; |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.io.UncheckedIOException; |
| import java.net.URL; |
| import java.nio.ByteBuffer; |
| import java.nio.ByteOrder; |
| import java.nio.channels.FileChannel; |
| import java.nio.file.FileSystems; |
| import java.util.Arrays; |
| import java.security.AccessController; |
| import java.security.PrivilegedAction; |
| |
| public final class ICUBinary { |
| |
| private static final class IsAcceptable implements Authenticate { |
| // @Override when we switch to Java 6 |
| public boolean isDataVersionAcceptable(byte version[]) { |
| return version[0] == 1; |
| } |
| } |
| |
| // public inner interface ------------------------------------------------ |
| |
| /** |
| * Special interface for data authentication |
| */ |
| public static interface Authenticate |
| { |
| /** |
| * Method used in ICUBinary.readHeader() to provide data format |
| * authentication. |
| * @param version version of the current data |
| * @return true if dataformat is an acceptable version, false otherwise |
| */ |
| public boolean isDataVersionAcceptable(byte version[]); |
| } |
| |
| // public methods -------------------------------------------------------- |
| |
| /** |
| * Loads an ICU binary data file and returns it as a ByteBuffer. |
| * The buffer contents is normally read-only, but its position etc. can be modified. |
| * |
| * @param itemPath Relative ICU data item path, for example "root.res" or "coll/ucadata.icu". |
| * @return The data as a read-only ByteBuffer. |
| */ |
| public static ByteBuffer getRequiredData(String itemPath) { |
| final Class<ICUBinary> root = ICUBinary.class; |
| |
| try (InputStream is = AccessController.doPrivileged(new PrivilegedAction<InputStream>() { |
| public InputStream run() { |
| return root.getResourceAsStream(itemPath); |
| } |
| })) { |
| |
| BufferedInputStream b=new BufferedInputStream(is, 4096 /* data buffer size */); |
| DataInputStream inputStream = new DataInputStream(b); |
| byte[] bb = new byte[120000]; |
| int n = inputStream.read(bb); |
| ByteBuffer bytes = ByteBuffer.wrap(bb, 0, n); |
| return bytes; |
| } |
| catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| } |
| |
| /** |
| * Same as readHeader(), but returns a VersionInfo rather than a compact int. |
| */ |
| public static VersionInfo readHeaderAndDataVersion(ByteBuffer bytes, |
| int dataFormat, |
| Authenticate authenticate) |
| throws IOException { |
| return getVersionInfoFromCompactInt(readHeader(bytes, dataFormat, authenticate)); |
| } |
| |
| private static final byte BIG_ENDIAN_ = 1; |
| public static final byte[] readHeader(InputStream inputStream, |
| byte dataFormatIDExpected[], |
| Authenticate authenticate) |
| throws IOException |
| { |
| DataInputStream input = new DataInputStream(inputStream); |
| char headersize = input.readChar(); |
| int readcount = 2; |
| //reading the header format |
| byte magic1 = input.readByte(); |
| readcount ++; |
| byte magic2 = input.readByte(); |
| readcount ++; |
| if (magic1 != MAGIC1 || magic2 != MAGIC2) { |
| throw new IOException(MAGIC_NUMBER_AUTHENTICATION_FAILED_); |
| } |
| |
| input.readChar(); // reading size |
| readcount += 2; |
| input.readChar(); // reading reserved word |
| readcount += 2; |
| byte bigendian = input.readByte(); |
| readcount ++; |
| byte charset = input.readByte(); |
| readcount ++; |
| byte charsize = input.readByte(); |
| readcount ++; |
| input.readByte(); // reading reserved byte |
| readcount ++; |
| |
| byte dataFormatID[] = new byte[4]; |
| input.readFully(dataFormatID); |
| readcount += 4; |
| byte dataVersion[] = new byte[4]; |
| input.readFully(dataVersion); |
| readcount += 4; |
| byte unicodeVersion[] = new byte[4]; |
| input.readFully(unicodeVersion); |
| readcount += 4; |
| if (headersize < readcount) { |
| throw new IOException("Internal Error: Header size error"); |
| } |
| input.skipBytes(headersize - readcount); |
| |
| if (bigendian != BIG_ENDIAN_ || charset != CHAR_SET_ |
| || charsize != CHAR_SIZE_ |
| || !Arrays.equals(dataFormatIDExpected, dataFormatID) |
| || (authenticate != null |
| && !authenticate.isDataVersionAcceptable(dataVersion))) { |
| throw new IOException(HEADER_AUTHENTICATION_FAILED_); |
| } |
| return unicodeVersion; |
| } |
| |
| /** |
| * Reads an ICU data header, checks the data format, and returns the data version. |
| * |
| * <p>Assumes that the ByteBuffer position is 0 on input. |
| * The buffer byte order is set according to the data. |
| * The buffer position is advanced past the header (including UDataInfo and comment). |
| * |
| * <p>See C++ ucmndata.h and unicode/udata.h. |
| * |
| * @return dataVersion |
| * @throws IOException if this is not a valid ICU data item of the expected dataFormat |
| */ |
| public static int readHeader(ByteBuffer bytes, int dataFormat, Authenticate authenticate) |
| throws IOException { |
| assert bytes.position() == 0; |
| byte magic1 = bytes.get(2); |
| byte magic2 = bytes.get(3); |
| if (magic1 != MAGIC1 || magic2 != MAGIC2) { |
| throw new IOException(MAGIC_NUMBER_AUTHENTICATION_FAILED_); |
| } |
| |
| byte isBigEndian = bytes.get(8); |
| byte charsetFamily = bytes.get(9); |
| byte sizeofUChar = bytes.get(10); |
| if (isBigEndian < 0 || 1 < isBigEndian || |
| charsetFamily != CHAR_SET_ || sizeofUChar != CHAR_SIZE_) { |
| throw new IOException(HEADER_AUTHENTICATION_FAILED_); |
| } |
| bytes.order(isBigEndian != 0 ? ByteOrder.BIG_ENDIAN : ByteOrder.LITTLE_ENDIAN); |
| |
| int headerSize = bytes.getChar(0); |
| int sizeofUDataInfo = bytes.getChar(4); |
| if (sizeofUDataInfo < 20 || headerSize < (sizeofUDataInfo + 4)) { |
| throw new IOException("Internal Error: Header size error"); |
| } |
| // TODO: Change Authenticate to take int major, int minor, int milli, int micro |
| // to avoid array allocation. |
| byte[] formatVersion = new byte[] { |
| bytes.get(16), bytes.get(17), bytes.get(18), bytes.get(19) |
| }; |
| if (bytes.get(12) != (byte)(dataFormat >> 24) || |
| bytes.get(13) != (byte)(dataFormat >> 16) || |
| bytes.get(14) != (byte)(dataFormat >> 8) || |
| bytes.get(15) != (byte)dataFormat || |
| (authenticate != null && !authenticate.isDataVersionAcceptable(formatVersion))) { |
| throw new IOException(HEADER_AUTHENTICATION_FAILED_ + |
| String.format("; data format %02x%02x%02x%02x, format version %d.%d.%d.%d", |
| bytes.get(12), bytes.get(13), bytes.get(14), bytes.get(15), |
| formatVersion[0] & 0xff, formatVersion[1] & 0xff, |
| formatVersion[2] & 0xff, formatVersion[3] & 0xff)); |
| } |
| |
| bytes.position(headerSize); |
| return // dataVersion |
| ((int)bytes.get(20) << 24) | |
| ((bytes.get(21) & 0xff) << 16) | |
| ((bytes.get(22) & 0xff) << 8) | |
| (bytes.get(23) & 0xff); |
| } |
| |
| public static void skipBytes(ByteBuffer bytes, int skipLength) { |
| if (skipLength > 0) { |
| bytes.position(bytes.position() + skipLength); |
| } |
| } |
| |
| /** |
| * Returns a VersionInfo for the bytes in the compact version integer. |
| */ |
| public static VersionInfo getVersionInfoFromCompactInt(int version) { |
| return VersionInfo.getInstance( |
| version >>> 24, (version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff); |
| } |
| |
| // private variables ------------------------------------------------- |
| |
| /** |
| * Magic numbers to authenticate the data file |
| */ |
| private static final byte MAGIC1 = (byte)0xda; |
| private static final byte MAGIC2 = (byte)0x27; |
| |
| /** |
| * File format authentication values |
| */ |
| private static final byte CHAR_SET_ = 0; |
| private static final byte CHAR_SIZE_ = 2; |
| |
| /** |
| * Error messages |
| */ |
| private static final String MAGIC_NUMBER_AUTHENTICATION_FAILED_ = |
| "ICUBinary data file error: Magin number authentication failed"; |
| private static final String HEADER_AUTHENTICATION_FAILED_ = |
| "ICUBinary data file error: Header authentication failed"; |
| } |