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8054834: Modular Source Code
Co-authored-by: Alan Bateman <alan.bateman@oracle.com> Co-authored-by: Alex Buckley <alex.buckley@oracle.com> Co-authored-by: Erik Joelsson <erik.joelsson@oracle.com> Co-authored-by: Jonathan Gibbons <jonathan.gibbons@oracle.com> Co-authored-by: Karen Kinnear <karen.kinnear@oracle.com> Co-authored-by: Magnus Ihse Bursie <magnus.ihse.bursie@oracle.com> Co-authored-by: Mandy Chung <mandy.chung@oracle.com> Co-authored-by: Mark Reinhold <mark.reinhold@oracle.com> Co-authored-by: Paul Sandoz <paul.sandoz@oracle.com> Reviewed-by: alanb, chegar, ihse, mduigou
This commit is contained in:
Chris Hegarty
parent
d1c0417898
commit
3bc69d393d
12567 changed files with 5941 additions and 5903 deletions
404
jdk/src/java.base/share/classes/java/lang/StringCoding.java
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404
jdk/src/java.base/share/classes/java/lang/StringCoding.java
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/*
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* Copyright (c) 2000, 2012, 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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package java.lang;
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import java.io.UnsupportedEncodingException;
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import java.lang.ref.SoftReference;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetDecoder;
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import java.nio.charset.CharsetEncoder;
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import java.nio.charset.CharacterCodingException;
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import java.nio.charset.CoderResult;
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import java.nio.charset.CodingErrorAction;
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import java.nio.charset.IllegalCharsetNameException;
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import java.nio.charset.UnsupportedCharsetException;
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import java.util.Arrays;
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import sun.misc.MessageUtils;
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import sun.nio.cs.HistoricallyNamedCharset;
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import sun.nio.cs.ArrayDecoder;
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import sun.nio.cs.ArrayEncoder;
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/**
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* Utility class for string encoding and decoding.
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*/
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class StringCoding {
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private StringCoding() { }
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/** The cached coders for each thread */
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private final static ThreadLocal<SoftReference<StringDecoder>> decoder =
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new ThreadLocal<>();
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private final static ThreadLocal<SoftReference<StringEncoder>> encoder =
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new ThreadLocal<>();
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private static boolean warnUnsupportedCharset = true;
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private static <T> T deref(ThreadLocal<SoftReference<T>> tl) {
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SoftReference<T> sr = tl.get();
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if (sr == null)
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return null;
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return sr.get();
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}
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private static <T> void set(ThreadLocal<SoftReference<T>> tl, T ob) {
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tl.set(new SoftReference<>(ob));
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}
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// Trim the given byte array to the given length
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//
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private static byte[] safeTrim(byte[] ba, int len, Charset cs, boolean isTrusted) {
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if (len == ba.length && (isTrusted || System.getSecurityManager() == null))
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return ba;
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else
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return Arrays.copyOf(ba, len);
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}
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// Trim the given char array to the given length
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//
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private static char[] safeTrim(char[] ca, int len,
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Charset cs, boolean isTrusted) {
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if (len == ca.length && (isTrusted || System.getSecurityManager() == null))
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return ca;
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else
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return Arrays.copyOf(ca, len);
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}
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private static int scale(int len, float expansionFactor) {
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// We need to perform double, not float, arithmetic; otherwise
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// we lose low order bits when len is larger than 2**24.
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return (int)(len * (double)expansionFactor);
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}
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private static Charset lookupCharset(String csn) {
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if (Charset.isSupported(csn)) {
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try {
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return Charset.forName(csn);
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} catch (UnsupportedCharsetException x) {
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throw new Error(x);
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}
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}
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return null;
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}
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private static void warnUnsupportedCharset(String csn) {
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if (warnUnsupportedCharset) {
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// Use sun.misc.MessageUtils rather than the Logging API or
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// System.err since this method may be called during VM
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// initialization before either is available.
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MessageUtils.err("WARNING: Default charset " + csn +
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" not supported, using ISO-8859-1 instead");
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warnUnsupportedCharset = false;
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}
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}
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// -- Decoding --
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private static class StringDecoder {
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private final String requestedCharsetName;
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private final Charset cs;
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private final CharsetDecoder cd;
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private final boolean isTrusted;
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private StringDecoder(Charset cs, String rcn) {
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this.requestedCharsetName = rcn;
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this.cs = cs;
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this.cd = cs.newDecoder()
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.onMalformedInput(CodingErrorAction.REPLACE)
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.onUnmappableCharacter(CodingErrorAction.REPLACE);
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this.isTrusted = (cs.getClass().getClassLoader0() == null);
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}
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String charsetName() {
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if (cs instanceof HistoricallyNamedCharset)
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return ((HistoricallyNamedCharset)cs).historicalName();
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return cs.name();
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}
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final String requestedCharsetName() {
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return requestedCharsetName;
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}
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char[] decode(byte[] ba, int off, int len) {
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int en = scale(len, cd.maxCharsPerByte());
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char[] ca = new char[en];
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if (len == 0)
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return ca;
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if (cd instanceof ArrayDecoder) {
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int clen = ((ArrayDecoder)cd).decode(ba, off, len, ca);
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return safeTrim(ca, clen, cs, isTrusted);
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} else {
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cd.reset();
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ByteBuffer bb = ByteBuffer.wrap(ba, off, len);
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CharBuffer cb = CharBuffer.wrap(ca);
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try {
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CoderResult cr = cd.decode(bb, cb, true);
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if (!cr.isUnderflow())
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cr.throwException();
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cr = cd.flush(cb);
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if (!cr.isUnderflow())
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cr.throwException();
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} catch (CharacterCodingException x) {
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// Substitution is always enabled,
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// so this shouldn't happen
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throw new Error(x);
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}
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return safeTrim(ca, cb.position(), cs, isTrusted);
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}
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}
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}
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static char[] decode(String charsetName, byte[] ba, int off, int len)
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throws UnsupportedEncodingException
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{
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StringDecoder sd = deref(decoder);
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String csn = (charsetName == null) ? "ISO-8859-1" : charsetName;
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if ((sd == null) || !(csn.equals(sd.requestedCharsetName())
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|| csn.equals(sd.charsetName()))) {
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sd = null;
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try {
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Charset cs = lookupCharset(csn);
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if (cs != null)
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sd = new StringDecoder(cs, csn);
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} catch (IllegalCharsetNameException x) {}
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if (sd == null)
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throw new UnsupportedEncodingException(csn);
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set(decoder, sd);
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}
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return sd.decode(ba, off, len);
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}
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static char[] decode(Charset cs, byte[] ba, int off, int len) {
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// (1)We never cache the "external" cs, the only benefit of creating
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// an additional StringDe/Encoder object to wrap it is to share the
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// de/encode() method. These SD/E objects are short-lifed, the young-gen
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// gc should be able to take care of them well. But the best approash
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// is still not to generate them if not really necessary.
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// (2)The defensive copy of the input byte/char[] has a big performance
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// impact, as well as the outgoing result byte/char[]. Need to do the
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// optimization check of (sm==null && classLoader0==null) for both.
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// (3)getClass().getClassLoader0() is expensive
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// (4)There might be a timing gap in isTrusted setting. getClassLoader0()
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// is only chcked (and then isTrusted gets set) when (SM==null). It is
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// possible that the SM==null for now but then SM is NOT null later
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// when safeTrim() is invoked...the "safe" way to do is to redundant
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// check (... && (isTrusted || SM == null || getClassLoader0())) in trim
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// but it then can be argued that the SM is null when the opertaion
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// is started...
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CharsetDecoder cd = cs.newDecoder();
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int en = scale(len, cd.maxCharsPerByte());
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char[] ca = new char[en];
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if (len == 0)
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return ca;
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boolean isTrusted = false;
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if (System.getSecurityManager() != null) {
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if (!(isTrusted = (cs.getClass().getClassLoader0() == null))) {
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ba = Arrays.copyOfRange(ba, off, off + len);
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off = 0;
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}
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}
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cd.onMalformedInput(CodingErrorAction.REPLACE)
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.onUnmappableCharacter(CodingErrorAction.REPLACE)
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.reset();
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if (cd instanceof ArrayDecoder) {
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int clen = ((ArrayDecoder)cd).decode(ba, off, len, ca);
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return safeTrim(ca, clen, cs, isTrusted);
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} else {
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ByteBuffer bb = ByteBuffer.wrap(ba, off, len);
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CharBuffer cb = CharBuffer.wrap(ca);
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try {
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CoderResult cr = cd.decode(bb, cb, true);
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if (!cr.isUnderflow())
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cr.throwException();
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cr = cd.flush(cb);
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if (!cr.isUnderflow())
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cr.throwException();
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} catch (CharacterCodingException x) {
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// Substitution is always enabled,
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// so this shouldn't happen
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throw new Error(x);
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}
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return safeTrim(ca, cb.position(), cs, isTrusted);
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}
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}
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static char[] decode(byte[] ba, int off, int len) {
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String csn = Charset.defaultCharset().name();
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try {
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// use charset name decode() variant which provides caching.
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return decode(csn, ba, off, len);
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} catch (UnsupportedEncodingException x) {
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warnUnsupportedCharset(csn);
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}
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try {
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return decode("ISO-8859-1", ba, off, len);
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} catch (UnsupportedEncodingException x) {
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// If this code is hit during VM initialization, MessageUtils is
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// the only way we will be able to get any kind of error message.
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MessageUtils.err("ISO-8859-1 charset not available: "
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+ x.toString());
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// If we can not find ISO-8859-1 (a required encoding) then things
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// are seriously wrong with the installation.
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System.exit(1);
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return null;
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}
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}
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// -- Encoding --
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private static class StringEncoder {
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private Charset cs;
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private CharsetEncoder ce;
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private final String requestedCharsetName;
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private final boolean isTrusted;
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private StringEncoder(Charset cs, String rcn) {
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this.requestedCharsetName = rcn;
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this.cs = cs;
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this.ce = cs.newEncoder()
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.onMalformedInput(CodingErrorAction.REPLACE)
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.onUnmappableCharacter(CodingErrorAction.REPLACE);
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this.isTrusted = (cs.getClass().getClassLoader0() == null);
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}
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String charsetName() {
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if (cs instanceof HistoricallyNamedCharset)
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return ((HistoricallyNamedCharset)cs).historicalName();
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return cs.name();
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}
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final String requestedCharsetName() {
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return requestedCharsetName;
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}
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byte[] encode(char[] ca, int off, int len) {
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int en = scale(len, ce.maxBytesPerChar());
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byte[] ba = new byte[en];
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if (len == 0)
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return ba;
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if (ce instanceof ArrayEncoder) {
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int blen = ((ArrayEncoder)ce).encode(ca, off, len, ba);
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return safeTrim(ba, blen, cs, isTrusted);
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} else {
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ce.reset();
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ByteBuffer bb = ByteBuffer.wrap(ba);
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CharBuffer cb = CharBuffer.wrap(ca, off, len);
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try {
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CoderResult cr = ce.encode(cb, bb, true);
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if (!cr.isUnderflow())
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cr.throwException();
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cr = ce.flush(bb);
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if (!cr.isUnderflow())
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cr.throwException();
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} catch (CharacterCodingException x) {
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// Substitution is always enabled,
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// so this shouldn't happen
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throw new Error(x);
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}
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return safeTrim(ba, bb.position(), cs, isTrusted);
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}
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}
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}
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static byte[] encode(String charsetName, char[] ca, int off, int len)
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throws UnsupportedEncodingException
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{
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StringEncoder se = deref(encoder);
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String csn = (charsetName == null) ? "ISO-8859-1" : charsetName;
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if ((se == null) || !(csn.equals(se.requestedCharsetName())
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|| csn.equals(se.charsetName()))) {
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se = null;
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try {
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Charset cs = lookupCharset(csn);
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if (cs != null)
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se = new StringEncoder(cs, csn);
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} catch (IllegalCharsetNameException x) {}
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if (se == null)
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throw new UnsupportedEncodingException (csn);
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set(encoder, se);
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}
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return se.encode(ca, off, len);
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}
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static byte[] encode(Charset cs, char[] ca, int off, int len) {
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CharsetEncoder ce = cs.newEncoder();
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int en = scale(len, ce.maxBytesPerChar());
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byte[] ba = new byte[en];
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if (len == 0)
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return ba;
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boolean isTrusted = false;
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if (System.getSecurityManager() != null) {
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if (!(isTrusted = (cs.getClass().getClassLoader0() == null))) {
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ca = Arrays.copyOfRange(ca, off, off + len);
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off = 0;
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}
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}
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ce.onMalformedInput(CodingErrorAction.REPLACE)
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.onUnmappableCharacter(CodingErrorAction.REPLACE)
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.reset();
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if (ce instanceof ArrayEncoder) {
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int blen = ((ArrayEncoder)ce).encode(ca, off, len, ba);
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return safeTrim(ba, blen, cs, isTrusted);
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} else {
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ByteBuffer bb = ByteBuffer.wrap(ba);
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CharBuffer cb = CharBuffer.wrap(ca, off, len);
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try {
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CoderResult cr = ce.encode(cb, bb, true);
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if (!cr.isUnderflow())
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cr.throwException();
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cr = ce.flush(bb);
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if (!cr.isUnderflow())
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cr.throwException();
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} catch (CharacterCodingException x) {
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throw new Error(x);
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}
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return safeTrim(ba, bb.position(), cs, isTrusted);
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}
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}
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static byte[] encode(char[] ca, int off, int len) {
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String csn = Charset.defaultCharset().name();
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try {
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// use charset name encode() variant which provides caching.
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return encode(csn, ca, off, len);
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} catch (UnsupportedEncodingException x) {
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warnUnsupportedCharset(csn);
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}
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try {
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return encode("ISO-8859-1", ca, off, len);
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} catch (UnsupportedEncodingException x) {
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// If this code is hit during VM initialization, MessageUtils is
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// the only way we will be able to get any kind of error message.
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MessageUtils.err("ISO-8859-1 charset not available: "
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+ x.toString());
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// If we can not find ISO-8859-1 (a required encoding) then things
|
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// are seriously wrong with the installation.
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System.exit(1);
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return null;
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}
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}
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}
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