mirror of git://gcc.gnu.org/git/gcc.git
430 lines
14 KiB
Java
430 lines
14 KiB
Java
/* OutputStreamWriter.java -- Writer that converts chars to bytes
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Copyright (C) 1998, 1999, 2000, 2001, 2003, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.io;
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import gnu.java.nio.charset.EncodingHelper;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.CharacterCodingException;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetEncoder;
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import java.nio.charset.CodingErrorAction;
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import java.nio.charset.MalformedInputException;
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/**
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* This class writes characters to an output stream that is byte oriented
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* It converts the chars that are written to bytes using an encoding layer,
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* which is specific to a particular encoding standard. The desired
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* encoding can either be specified by name, or if no encoding is specified,
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* the system default encoding will be used. The system default encoding
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* name is determined from the system property <code>file.encoding</code>.
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* The only encodings that are guaranteed to be available are "8859_1"
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* (the Latin-1 character set) and "UTF8". Unfortunately, Java does not
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* provide a mechanism for listing the encodings that are supported in
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* a given implementation.
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* <p>
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* Here is a list of standard encoding names that may be available:
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* <p>
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* <ul>
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* <li>8859_1 (ISO-8859-1/Latin-1)
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* <li>8859_2 (ISO-8859-2/Latin-2)
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* <li>8859_3 (ISO-8859-3/Latin-3)
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* <li>8859_4 (ISO-8859-4/Latin-4)
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* <li>8859_5 (ISO-8859-5/Latin-5)
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* <li>8859_6 (ISO-8859-6/Latin-6)
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* <li>8859_7 (ISO-8859-7/Latin-7)
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* <li>8859_8 (ISO-8859-8/Latin-8)
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* <li>8859_9 (ISO-8859-9/Latin-9)
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* <li>ASCII (7-bit ASCII)
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* <li>UTF8 (UCS Transformation Format-8)
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* <li>More Later
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* </ul>
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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* @author Per Bothner (bothner@cygnus.com)
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* @date April 17, 1998.
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*/
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public class OutputStreamWriter extends Writer
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{
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/**
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* The output stream.
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*/
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private OutputStream out;
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/**
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* The charset encoder.
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*/
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private final CharsetEncoder encoder;
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/**
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* java.io canonical name of the encoding.
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*/
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private final String encodingName;
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/**
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* Buffer output before character conversion as it has costly overhead.
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*/
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private final CharBuffer outputBuffer;
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private final static int BUFFER_SIZE = 1024;
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/**
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* This method initializes a new instance of <code>OutputStreamWriter</code>
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* to write to the specified stream using a caller supplied character
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* encoding scheme. Note that due to a deficiency in the Java language
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* design, there is no way to determine which encodings are supported.
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*
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* @param out The <code>OutputStream</code> to write to
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* @param encoding_scheme The name of the encoding scheme to use for
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* character to byte translation
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*
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* @exception UnsupportedEncodingException If the named encoding is
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* not available.
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*/
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public OutputStreamWriter (OutputStream out, String encoding_scheme)
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throws UnsupportedEncodingException
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{
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CharsetEncoder encoder;
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String encodingName;
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this.out = out;
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outputBuffer = CharBuffer.allocate(BUFFER_SIZE);
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try
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{
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// Don't use NIO if avoidable
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if(EncodingHelper.isISOLatin1(encoding_scheme))
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{
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encodingName = "ISO8859_1";
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encoder = null;
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}
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else
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{
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/*
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* Workaround for encodings with a byte-order-mark.
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* We only want to write it once per stream.
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*/
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try
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{
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if(encoding_scheme.equalsIgnoreCase("UnicodeBig") ||
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encoding_scheme.equalsIgnoreCase("UTF-16") ||
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encoding_scheme.equalsIgnoreCase("UTF16"))
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{
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encoding_scheme = "UTF-16BE";
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out.write((byte)0xFE);
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out.write((byte)0xFF);
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}
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else if(encoding_scheme.equalsIgnoreCase("UnicodeLittle"))
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{
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encoding_scheme = "UTF-16LE";
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out.write((byte)0xFF);
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out.write((byte)0xFE);
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}
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}
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catch(IOException ioe)
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{
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}
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Charset cs = EncodingHelper.getCharset(encoding_scheme);
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if(cs == null)
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throw new UnsupportedEncodingException("Encoding "+encoding_scheme+
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" unknown");
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encoder = cs.newEncoder();
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encodingName = EncodingHelper.getOldCanonical(cs.name());
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encoder.onMalformedInput(CodingErrorAction.REPLACE);
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encoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
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}
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}
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catch(RuntimeException e)
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{
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// Default to ISO Latin-1, will happen if this is called, for instance,
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// before the NIO provider is loadable.
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encoder = null;
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encodingName = "ISO8859_1";
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}
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this.encoder = encoder;
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this.encodingName = encodingName;
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}
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/**
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* This method initializes a new instance of <code>OutputStreamWriter</code>
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* to write to the specified stream using the default encoding.
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*
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* @param out The <code>OutputStream</code> to write to
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*/
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public OutputStreamWriter (OutputStream out)
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{
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CharsetEncoder encoder;
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String encodingName;
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this.out = out;
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outputBuffer = CharBuffer.allocate(BUFFER_SIZE);
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try
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{
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String encoding = System.getProperty("file.encoding");
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Charset cs = Charset.forName(encoding);
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encoder = cs.newEncoder();
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encodingName = EncodingHelper.getOldCanonical(cs.name());
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}
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catch(RuntimeException e)
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{
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encoder = null;
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encodingName = "ISO8859_1";
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}
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if(encoder != null)
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{
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encoder.onMalformedInput(CodingErrorAction.REPLACE);
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encoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
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}
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this.encoder = encoder;
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this.encodingName = encodingName;
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}
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/**
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* This method initializes a new instance of <code>OutputStreamWriter</code>
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* to write to the specified stream using a given <code>Charset</code>.
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*
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* @param out The <code>OutputStream</code> to write to
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* @param cs The <code>Charset</code> of the encoding to use
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*
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* @since 1.5
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*/
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public OutputStreamWriter(OutputStream out, Charset cs)
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{
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this.out = out;
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encoder = cs.newEncoder();
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encoder.onMalformedInput(CodingErrorAction.REPLACE);
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encoder.onUnmappableCharacter(CodingErrorAction.REPLACE);
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outputBuffer = CharBuffer.allocate(BUFFER_SIZE);
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encodingName = EncodingHelper.getOldCanonical(cs.name());
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}
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/**
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* This method initializes a new instance of <code>OutputStreamWriter</code>
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* to write to the specified stream using a given
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* <code>CharsetEncoder</code>.
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*
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* @param out The <code>OutputStream</code> to write to
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* @param enc The <code>CharsetEncoder</code> to encode the output with
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*
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* @since 1.5
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*/
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public OutputStreamWriter(OutputStream out, CharsetEncoder enc)
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{
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this.out = out;
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encoder = enc;
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outputBuffer = CharBuffer.allocate(BUFFER_SIZE);
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Charset cs = enc.charset();
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if (cs == null)
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encodingName = "US-ASCII";
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else
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encodingName = EncodingHelper.getOldCanonical(cs.name());
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}
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/**
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* This method closes this stream, and the underlying
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* <code>OutputStream</code>
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*
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* @exception IOException If an error occurs
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*/
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public void close () throws IOException
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{
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if(out == null)
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return;
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flush();
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out.close ();
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out = null;
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}
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/**
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* This method returns the name of the character encoding scheme currently
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* in use by this stream. If the stream has been closed, then this method
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* may return <code>null</code>.
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*
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* @return The encoding scheme name
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*/
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public String getEncoding ()
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{
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return out != null ? encodingName : null;
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}
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/**
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* This method flushes any buffered bytes to the underlying output sink.
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*
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* @exception IOException If an error occurs
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*/
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public void flush () throws IOException
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{
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if(out != null){
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if(outputBuffer != null){
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char[] buf = new char[outputBuffer.position()];
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if(buf.length > 0){
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outputBuffer.flip();
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outputBuffer.get(buf);
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writeConvert(buf, 0, buf.length);
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outputBuffer.clear();
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}
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}
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out.flush ();
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}
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}
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/**
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* This method writes <code>count</code> characters from the specified
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* array to the output stream starting at position <code>offset</code>
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* into the array.
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*
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* @param buf The array of character to write from
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* @param offset The offset into the array to start writing chars from
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* @param count The number of chars to write.
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*
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* @exception IOException If an error occurs
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*/
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public void write (char[] buf, int offset, int count) throws IOException
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{
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if(out == null)
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throw new IOException("Stream is closed.");
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if(buf == null)
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throw new IOException("Buffer is null.");
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if(outputBuffer != null)
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{
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if(count >= outputBuffer.remaining())
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{
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int r = outputBuffer.remaining();
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outputBuffer.put(buf, offset, r);
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writeConvert(outputBuffer.array(), 0, BUFFER_SIZE);
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outputBuffer.clear();
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offset += r;
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count -= r;
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// if the remaining bytes is larger than the whole buffer,
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// just don't buffer.
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if(count >= outputBuffer.remaining()){
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writeConvert(buf, offset, count);
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return;
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}
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}
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outputBuffer.put(buf, offset, count);
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} else writeConvert(buf, offset, count);
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}
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/**
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* Converts and writes characters.
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*/
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private void writeConvert (char[] buf, int offset, int count)
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throws IOException
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{
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if(encoder == null)
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{
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byte[] b = new byte[count];
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for(int i=0;i<count;i++)
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b[i] = nullConversion(buf[offset+i]);
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out.write(b);
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} else {
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try {
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ByteBuffer output = encoder.encode(CharBuffer.wrap(buf,offset,count));
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encoder.reset();
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if(output.hasArray())
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out.write(output.array());
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else
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{
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byte[] outbytes = new byte[output.remaining()];
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output.get(outbytes);
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out.write(outbytes);
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}
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} catch(IllegalStateException e) {
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throw new IOException("Internal error.");
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} catch(MalformedInputException e) {
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throw new IOException("Invalid character sequence.");
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} catch(CharacterCodingException e) {
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throw new IOException("Unmappable character.");
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}
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}
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}
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private byte nullConversion(char c) {
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return (byte)((c <= 0xFF)?c:'?');
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}
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/**
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* This method writes <code>count</code> bytes from the specified
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* <code>String</code> starting at position <code>offset</code> into the
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* <code>String</code>.
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*
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* @param str The <code>String</code> to write chars from
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* @param offset The position in the <code>String</code> to start
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* writing chars from
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* @param count The number of chars to write
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*
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* @exception IOException If an error occurs
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*/
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public void write (String str, int offset, int count) throws IOException
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{
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if(str == null)
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throw new IOException("String is null.");
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write(str.toCharArray(), offset, count);
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}
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/**
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* This method writes a single character to the output stream.
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*
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* @param ch The char to write, passed as an int.
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*
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* @exception IOException If an error occurs
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*/
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public void write (int ch) throws IOException
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{
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// No buffering, no encoding ... just pass through
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if (encoder == null && outputBuffer == null) {
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out.write(nullConversion((char)ch));
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} else {
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if (outputBuffer != null) {
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if (outputBuffer.remaining() == 0) {
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writeConvert(outputBuffer.array(), 0, BUFFER_SIZE);
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outputBuffer.clear();
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}
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outputBuffer.put((char)ch);
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} else {
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writeConvert(new char[]{ (char)ch }, 0, 1);
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}
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}
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}
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} // class OutputStreamWriter
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