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304 lines
10 KiB
Java
304 lines
10 KiB
Java
/*
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* Copyright (c) 2003, 2021, 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 jdk_internal.icu.impl;
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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 jdk_internal.icu.util.VersionInfo;
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import net.lax1dude.eaglercraft.v1_8.EagRuntime;
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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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* Method used in ICUBinary.readHeader() to provide data format authentication.
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*
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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. The buffer
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* 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
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* "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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try (InputStream is = EagRuntime.getRequiredResourceStream(itemPath)) {
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// is.available() may return 0, or 1, or the total number of bytes in the
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// stream,
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// or some other number.
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// Do not try to use is.available() == 0 to find the end of the stream!
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byte[] bytes;
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int avail = is.available();
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if (avail > 32) {
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// There are more bytes available than just the ICU data header length.
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// With luck, it is the total number of bytes.
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bytes = new byte[avail];
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} else {
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bytes = new byte[128]; // empty .res files are even smaller
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}
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// Call is.read(...) until one returns a negative value.
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int length = 0;
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for (;;) {
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if (length < bytes.length) {
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int numRead = is.read(bytes, length, bytes.length - length);
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if (numRead < 0) {
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break; // end of stream
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}
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length += numRead;
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} else {
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// See if we are at the end of the stream before we grow the array.
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int nextByte = is.read();
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if (nextByte < 0) {
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break;
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}
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int capacity = 2 * bytes.length;
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if (capacity < 128) {
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capacity = 128;
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} else if (capacity < 0x4000) {
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capacity *= 2; // Grow faster until we reach 16kB.
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}
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bytes = Arrays.copyOf(bytes, capacity);
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bytes[length++] = (byte) nextByte;
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}
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}
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return ByteBuffer.wrap(bytes, 0, length);
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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, int dataFormat, 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, byte dataFormatIDExpected[],
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Authenticate authenticate) throws IOException {
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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_ || charsize != CHAR_SIZE_
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|| !Arrays.equals(dataFormatIDExpected, dataFormatID)
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|| (authenticate != null && !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
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* version.
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*
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* <p>
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* Assumes that the ByteBuffer position is 0 on input. The buffer byte order is
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* set according to the data. The buffer position is advanced past the header
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* (including UDataInfo and comment).
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*
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* <p>
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* 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
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* dataFormat
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*/
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public static int readHeader(ByteBuffer bytes, int dataFormat, Authenticate authenticate) 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 || 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[] { bytes.get(16), bytes.get(17), bytes.get(18), bytes.get(19) };
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if (bytes.get(12) != (byte) (dataFormat >> 24) || bytes.get(13) != (byte) (dataFormat >> 16)
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|| bytes.get(14) != (byte) (dataFormat >> 8) || 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", bytes.get(12),
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bytes.get(13), bytes.get(14), bytes.get(15), formatVersion[0] & 0xff,
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formatVersion[1] & 0xff, 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) | ((bytes.get(21) & 0xff) << 16) | ((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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public static byte[] getBytes(ByteBuffer bytes, int length, int additionalSkipLength) {
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byte[] dest = new byte[length];
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bytes.get(dest);
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if (additionalSkipLength > 0) {
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skipBytes(bytes, additionalSkipLength);
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}
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return dest;
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}
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public static String getString(ByteBuffer bytes, int length, int additionalSkipLength) {
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CharSequence cs = bytes.asCharBuffer();
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String s = cs.subSequence(0, length).toString();
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skipBytes(bytes, length * 2 + additionalSkipLength);
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return s;
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}
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public static char[] getChars(ByteBuffer bytes, int length, int additionalSkipLength) {
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char[] dest = new char[length];
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bytes.asCharBuffer().get(dest);
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skipBytes(bytes, length * 2 + additionalSkipLength);
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return dest;
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}
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public static int[] getInts(ByteBuffer bytes, int length, int additionalSkipLength) {
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int[] dest = new int[length];
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bytes.asIntBuffer().get(dest);
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skipBytes(bytes, length * 4 + additionalSkipLength);
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return dest;
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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(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_ = "ICUBinary data file error: Magic number authentication failed";
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private static final String HEADER_AUTHENTICATION_FAILED_ = "ICUBinary data file error: Header authentication failed";
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}
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