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authorAndrew Haley <aph@redhat.com>2016-09-30 16:24:48 +0000
committerAndrew Haley <aph@gcc.gnu.org>2016-09-30 16:24:48 +0000
commit07b78716af6a9d7c9fd1e94d9baf94a52c873947 (patch)
tree3f22b3241c513ad168c8353805614ae1249410f4 /libjava/classpath/java/io/InputStreamReader.java
parenteae993948bae8b788c53772bcb9217c063716f93 (diff)
Makefile.def: Remove libjava.
2016-09-30 Andrew Haley <aph@redhat.com> * Makefile.def: Remove libjava. * Makefile.tpl: Likewise. * Makefile.in: Regenerate. * configure.ac: Likewise. * configure: Likewise. * gcc/java: Remove. * libjava: Likewise. From-SVN: r240662
Diffstat (limited to 'libjava/classpath/java/io/InputStreamReader.java')
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diff --git a/libjava/classpath/java/io/InputStreamReader.java b/libjava/classpath/java/io/InputStreamReader.java
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-/* InputStreamReader.java -- Reader than transforms bytes to chars
- Copyright (C) 1998, 1999, 2001, 2003, 2004, 2005, 2006
- Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.io;
-
-import gnu.classpath.SystemProperties;
-import gnu.java.nio.charset.EncodingHelper;
-
-import java.nio.ByteBuffer;
-import java.nio.CharBuffer;
-import java.nio.charset.Charset;
-import java.nio.charset.CharsetDecoder;
-import java.nio.charset.CoderResult;
-import java.nio.charset.CodingErrorAction;
-
-/**
- * This class reads characters from a byte input stream. The characters
- * read are converted from bytes in the underlying stream by a
- * decoding layer. The decoding layer transforms bytes to chars according
- * to an encoding standard. There are many available encodings to choose
- * from. The desired encoding can either be specified by name, or if no
- * encoding is selected, the system default encoding will be used. The
- * system default encoding name is determined from the system property
- * <code>file.encoding</code>. The only encodings that are guaranteed to
- * be availalbe are "8859_1" (the Latin-1 character set) and "UTF8".
- * Unforunately, Java does not provide a mechanism for listing the
- * ecodings that are supported in a given implementation.
- * <p>
- * Here is a list of standard encoding names that may be available:
- * <p>
- * <ul>
- * <li>8859_1 (ISO-8859-1/Latin-1)</li>
- * <li>8859_2 (ISO-8859-2/Latin-2)</li>
- * <li>8859_3 (ISO-8859-3/Latin-3)</li>
- * <li>8859_4 (ISO-8859-4/Latin-4)</li>
- * <li>8859_5 (ISO-8859-5/Latin-5)</li>
- * <li>8859_6 (ISO-8859-6/Latin-6)</li>
- * <li>8859_7 (ISO-8859-7/Latin-7)</li>
- * <li>8859_8 (ISO-8859-8/Latin-8)</li>
- * <li>8859_9 (ISO-8859-9/Latin-9)</li>
- * <li>ASCII (7-bit ASCII)</li>
- * <li>UTF8 (UCS Transformation Format-8)</li>
- * <li>More later</li>
- * </ul>
- * <p>
- * It is recommended that applications do not use
- * <code>InputStreamReader</code>'s
- * directly. Rather, for efficiency purposes, an object of this class
- * should be wrapped by a <code>BufferedReader</code>.
- * <p>
- * Due to a deficiency the Java class library design, there is no standard
- * way for an application to install its own byte-character encoding.
- *
- * @see BufferedReader
- * @see InputStream
- *
- * @author Robert Schuster
- * @author Aaron M. Renn (arenn@urbanophile.com)
- * @author Per Bothner (bothner@cygnus.com)
- * @date April 22, 1998.
- */
-public class InputStreamReader extends Reader
-{
- /**
- * The input stream.
- */
- private InputStream in;
-
- /**
- * The charset decoder.
- */
- private CharsetDecoder decoder;
-
- /**
- * End of stream reached.
- */
- private boolean isDone = false;
-
- /**
- * Need this.
- */
- private float maxBytesPerChar;
-
- /**
- * Buffer holding surplus loaded bytes (if any)
- */
- private ByteBuffer byteBuffer;
-
- /**
- * java.io canonical name of the encoding.
- */
- private String encoding;
-
- /**
- * We might decode to a 2-char UTF-16 surrogate, which won't fit in the
- * output buffer. In this case we need to save the surrogate char.
- */
- private char savedSurrogate;
- private boolean hasSavedSurrogate = false;
-
- /**
- * A byte array to be reused in read(byte[], int, int).
- */
- private byte[] bytesCache;
-
- /**
- * Locks the bytesCache above in read(byte[], int, int).
- */
- private Object cacheLock = new Object();
-
- /**
- * This method initializes a new instance of <code>InputStreamReader</code>
- * to read from the specified stream using the default encoding.
- *
- * @param in The <code>InputStream</code> to read from
- */
- public InputStreamReader(InputStream in)
- {
- if (in == null)
- throw new NullPointerException();
- this.in = in;
- try
- {
- encoding = SystemProperties.getProperty("file.encoding");
- // Don't use NIO if avoidable
- if(EncodingHelper.isISOLatin1(encoding))
- {
- encoding = "ISO8859_1";
- maxBytesPerChar = 1f;
- decoder = null;
- return;
- }
- Charset cs = EncodingHelper.getCharset(encoding);
- decoder = cs.newDecoder();
- encoding = EncodingHelper.getOldCanonical(cs.name());
- try {
- maxBytesPerChar = cs.newEncoder().maxBytesPerChar();
- } catch(UnsupportedOperationException _){
- maxBytesPerChar = 1f;
- }
- decoder.onMalformedInput(CodingErrorAction.REPLACE);
- decoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
- decoder.reset();
- } catch(RuntimeException e) {
- encoding = "ISO8859_1";
- maxBytesPerChar = 1f;
- decoder = null;
- } catch(UnsupportedEncodingException e) {
- encoding = "ISO8859_1";
- maxBytesPerChar = 1f;
- decoder = null;
- }
- }
-
- /**
- * This method initializes a new instance of <code>InputStreamReader</code>
- * to read from the specified stream using a caller supplied character
- * encoding scheme. Note that due to a deficiency in the Java language
- * design, there is no way to determine which encodings are supported.
- *
- * @param in The <code>InputStream</code> to read from
- * @param encoding_name The name of the encoding scheme to use
- *
- * @exception UnsupportedEncodingException If the encoding scheme
- * requested is not available.
- */
- public InputStreamReader(InputStream in, String encoding_name)
- throws UnsupportedEncodingException
- {
- if (in == null
- || encoding_name == null)
- throw new NullPointerException();
-
- this.in = in;
- // Don't use NIO if avoidable
- if(EncodingHelper.isISOLatin1(encoding_name))
- {
- encoding = "ISO8859_1";
- maxBytesPerChar = 1f;
- decoder = null;
- return;
- }
- try {
- Charset cs = EncodingHelper.getCharset(encoding_name);
- try {
- maxBytesPerChar = cs.newEncoder().maxBytesPerChar();
- } catch(UnsupportedOperationException _){
- maxBytesPerChar = 1f;
- }
-
- decoder = cs.newDecoder();
- decoder.onMalformedInput(CodingErrorAction.REPLACE);
- decoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
- decoder.reset();
-
- // The encoding should be the old name, if such exists.
- encoding = EncodingHelper.getOldCanonical(cs.name());
- } catch(RuntimeException e) {
- encoding = "ISO8859_1";
- maxBytesPerChar = 1f;
- decoder = null;
- }
- }
-
- /**
- * Creates an InputStreamReader that uses a decoder of the given
- * charset to decode the bytes in the InputStream into
- * characters.
- *
- * @since 1.4
- */
- public InputStreamReader(InputStream in, Charset charset) {
- if (in == null)
- throw new NullPointerException();
- this.in = in;
- decoder = charset.newDecoder();
-
- try {
- maxBytesPerChar = charset.newEncoder().maxBytesPerChar();
- } catch(UnsupportedOperationException _){
- maxBytesPerChar = 1f;
- }
-
- decoder.onMalformedInput(CodingErrorAction.REPLACE);
- decoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
- decoder.reset();
- encoding = EncodingHelper.getOldCanonical(charset.name());
- }
-
- /**
- * Creates an InputStreamReader that uses the given charset decoder
- * to decode the bytes in the InputStream into characters.
- *
- * @since 1.4
- */
- public InputStreamReader(InputStream in, CharsetDecoder decoder) {
- if (in == null)
- throw new NullPointerException();
- this.in = in;
- this.decoder = decoder;
-
- Charset charset = decoder.charset();
- try {
- if (charset == null)
- maxBytesPerChar = 1f;
- else
- maxBytesPerChar = charset.newEncoder().maxBytesPerChar();
- } catch(UnsupportedOperationException _){
- maxBytesPerChar = 1f;
- }
-
- decoder.onMalformedInput(CodingErrorAction.REPLACE);
- decoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
- decoder.reset();
- if (charset == null)
- encoding = "US-ASCII";
- else
- encoding = EncodingHelper.getOldCanonical(decoder.charset().name());
- }
-
- /**
- * This method closes this stream, as well as the underlying
- * <code>InputStream</code>.
- *
- * @exception IOException If an error occurs
- */
- public void close() throws IOException
- {
- synchronized (lock)
- {
- // Makes sure all intermediate data is released by the decoder.
- if (decoder != null)
- decoder.reset();
- if (in != null)
- in.close();
- in = null;
- isDone = true;
- decoder = null;
- }
- }
-
- /**
- * This method returns the name of the encoding that is currently in use
- * by this object. If the stream has been closed, this method is allowed
- * to return <code>null</code>.
- *
- * @return The current encoding name
- */
- public String getEncoding()
- {
- return in != null ? encoding : null;
- }
-
- /**
- * This method checks to see if the stream is ready to be read. It
- * will return <code>true</code> if is, or <code>false</code> if it is not.
- * If the stream is not ready to be read, it could (although is not required
- * to) block on the next read attempt.
- *
- * @return <code>true</code> if the stream is ready to be read,
- * <code>false</code> otherwise
- *
- * @exception IOException If an error occurs
- */
- public boolean ready() throws IOException
- {
- if (in == null)
- throw new IOException("Reader has been closed");
-
- return in.available() != 0;
- }
-
- /**
- * This method reads up to <code>length</code> characters from the stream into
- * the specified array starting at index <code>offset</code> into the
- * array.
- *
- * @param buf The character array to recieve the data read
- * @param offset The offset into the array to start storing characters
- * @param length The requested number of characters to read.
- *
- * @return The actual number of characters read, or -1 if end of stream.
- *
- * @exception IOException If an error occurs
- */
- public int read(char[] buf, int offset, int length) throws IOException
- {
- if (in == null)
- throw new IOException("Reader has been closed");
- if (isDone)
- return -1;
- if(decoder != null)
- {
- int totalBytes = (int)((double) length * maxBytesPerChar);
- if (byteBuffer != null)
- totalBytes = Math.max(totalBytes, byteBuffer.remaining());
- byte[] bytes;
- // Fetch cached bytes array if available and big enough.
- synchronized(cacheLock)
- {
- bytes = bytesCache;
- if (bytes == null || bytes.length < totalBytes)
- bytes = new byte[totalBytes];
- else
- bytesCache = null;
- }
-
- int remaining = 0;
- if(byteBuffer != null)
- {
- remaining = byteBuffer.remaining();
- byteBuffer.get(bytes, 0, remaining);
- }
- int read;
- if(totalBytes - remaining > 0)
- {
- read = in.read(bytes, remaining, totalBytes - remaining);
- if(read == -1){
- read = remaining;
- isDone = true;
- } else
- read += remaining;
- } else
- read = remaining;
- byteBuffer = ByteBuffer.wrap(bytes, 0, read);
- CharBuffer cb = CharBuffer.wrap(buf, offset, length);
- int startPos = cb.position();
-
- if(hasSavedSurrogate){
- hasSavedSurrogate = false;
- cb.put(savedSurrogate);
- read++;
- }
-
- CoderResult cr = decoder.decode(byteBuffer, cb, isDone);
- decoder.reset();
- // 1 char remains which is the first half of a surrogate pair.
- if(cr.isOverflow() && cb.hasRemaining()){
- CharBuffer overflowbuf = CharBuffer.allocate(2);
- cr = decoder.decode(byteBuffer, overflowbuf, isDone);
- overflowbuf.flip();
- if(overflowbuf.hasRemaining())
- {
- cb.put(overflowbuf.get());
- savedSurrogate = overflowbuf.get();
- hasSavedSurrogate = true;
- isDone = false;
- }
- }
-
- if(byteBuffer.hasRemaining()) {
- byteBuffer.compact();
- byteBuffer.flip();
- isDone = false;
- } else
- byteBuffer = null;
-
- read = cb.position() - startPos;
-
- // Put cached bytes array back if we are finished and the cache
- // is null or smaller than the used bytes array.
- synchronized (cacheLock)
- {
- if (byteBuffer == null
- && (bytesCache == null || bytesCache.length < bytes.length))
- bytesCache = bytes;
- }
- return (read <= 0) ? -1 : read;
- }
- else
- {
- byte[] bytes;
- // Fetch cached bytes array if available and big enough.
- synchronized (cacheLock)
- {
- bytes = bytesCache;
- if (bytes == null || length < bytes.length)
- bytes = new byte[length];
- else
- bytesCache = null;
- }
-
- int read = in.read(bytes);
- for(int i=0;i<read;i++)
- buf[offset+i] = (char)(bytes[i]&0xFF);
-
- // Put back byte array into cache if appropriate.
- synchronized (cacheLock)
- {
- if (bytesCache == null || bytesCache.length < bytes.length)
- bytesCache = bytes;
- }
- return read;
- }
- }
-
- /**
- * Reads an char from the input stream and returns it
- * as an int in the range of 0-65535. This method also will return -1 if
- * the end of the stream has been reached.
- * <p>
- * This method will block until the char can be read.
- *
- * @return The char read or -1 if end of stream
- *
- * @exception IOException If an error occurs
- */
- public int read() throws IOException
- {
- char[] buf = new char[1];
- int count = read(buf, 0, 1);
- return count > 0 ? buf[0] : -1;
- }
-
- /**
- * Skips the specified number of chars in the stream. It
- * returns the actual number of chars skipped, which may be less than the
- * requested amount.
- *
- * @param count The requested number of chars to skip
- *
- * @return The actual number of chars skipped.
- *
- * @exception IOException If an error occurs
- */
- public long skip(long count) throws IOException
- {
- if (in == null)
- throw new IOException("Reader has been closed");
-
- return super.skip(count);
- }
-}