From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/java/io/OutputStreamWriter.java | 347 ++++++++++++++++++++++++++++++++ 1 file changed, 347 insertions(+) create mode 100644 libjava/java/io/OutputStreamWriter.java (limited to 'libjava/java/io/OutputStreamWriter.java') diff --git a/libjava/java/io/OutputStreamWriter.java b/libjava/java/io/OutputStreamWriter.java new file mode 100644 index 000000000..aac1684c6 --- /dev/null +++ b/libjava/java/io/OutputStreamWriter.java @@ -0,0 +1,347 @@ +/* OutputStreamWriter.java -- Writer that converts chars to bytes + Copyright (C) 1998, 1999, 2000, 2001, 2003, 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.gcj.convert.UnicodeToBytes; +import gnu.gcj.convert.CharsetToBytesAdaptor; +import java.nio.charset.Charset; +import java.nio.charset.CharsetEncoder; + +/** + * This class writes characters to an output stream that is byte oriented + * It converts the chars that are written to bytes using an encoding layer, + * which is specific to a particular encoding standard. The desired + * encoding can either be specified by name, or if no encoding is specified, + * the system default encoding will be used. The system default encoding + * name is determined from the system property file.encoding. + * The only encodings that are guaranteed to be available are "8859_1" + * (the Latin-1 character set) and "UTF8". Unfortunately, Java does not + * provide a mechanism for listing the encodings that are supported in + * a given implementation. + *

+ * Here is a list of standard encoding names that may be available: + *

+ *

+ * + * @author Aaron M. Renn (arenn@urbanophile.com) + * @author Per Bothner (bothner@cygnus.com) + * @date April 17, 1998. + */ +public class OutputStreamWriter extends Writer +{ + BufferedOutputStream out; + + /** + * This is the byte-character encoder class that does the writing and + * translation of characters to bytes before writing to the underlying + * class. + */ + UnicodeToBytes converter; + + /* Temporary buffer. */ + private char[] work; + private int wcount; + + private OutputStreamWriter(OutputStream out, UnicodeToBytes encoder) + { + this.out = out instanceof BufferedOutputStream + ? (BufferedOutputStream) out + : new BufferedOutputStream(out, 250); + /* Don't need to call super(out) here as long as the lock gets set. */ + this.lock = out; + this.converter = encoder; + } + + /** + * This method initializes a new instance of OutputStreamWriter + * to write to 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 out The OutputStream to write to + * @param encoding_scheme The name of the encoding scheme to use for + * character to byte translation + * + * @exception UnsupportedEncodingException If the named encoding is + * not available. + */ + public OutputStreamWriter (OutputStream out, String encoding_scheme) + throws UnsupportedEncodingException + { + this(out, UnicodeToBytes.getEncoder(encoding_scheme)); + } + + /** + * This method initializes a new instance of OutputStreamWriter + * to write to the specified stream using the default encoding. + * + * @param out The OutputStream to write to + */ + public OutputStreamWriter (OutputStream out) + { + this(out, UnicodeToBytes.getDefaultEncoder()); + } + + /** + * This method initializes a new instance of OutputStreamWriter + * to write to the specified stream using a given Charset. + * + * @param out The OutputStream to write to + * @param cs The Charset of the encoding to use + */ + public OutputStreamWriter(OutputStream out, Charset cs) + { + this(out, new CharsetToBytesAdaptor(cs)); + } + + /** + * This method initializes a new instance of OutputStreamWriter + * to write to the specified stream using a given + * CharsetEncoder. + * + * @param out The OutputStream to write to + * @param enc The CharsetEncoder to encode the output with + */ + public OutputStreamWriter(OutputStream out, CharsetEncoder enc) + { + this(out, new CharsetToBytesAdaptor(enc)); + } + + /** + * This method closes this stream, and the underlying + * OutputStream + * + * @exception IOException If an error occurs + */ + public void close () throws IOException + { + synchronized (lock) + { + if (out != null) + { + converter.setFinished(); + flush(); + out.close(); + out = null; + } + work = null; + } + } + + /** + * This method returns the name of the character encoding scheme currently + * in use by this stream. If the stream has been closed, then this method + * may return null. + * + * @return The encoding scheme name + */ + public String getEncoding () + { + return out != null ? converter.getName() : null; + } + + /** + * This method flushes any buffered bytes to the underlying output sink. + * + * @exception IOException If an error occurs + */ + public void flush () throws IOException + { + synchronized (lock) + { + if (out == null) + throw new IOException("Stream closed"); + + // Always write -- if we are close()ing then we want to make + // sure the converter is flushed. + if (work == null) + work = new char[100]; + writeChars(work, 0, wcount); + wcount = 0; + + out.flush(); + } + } + + /** + * This method writes count characters from the specified + * array to the output stream starting at position offset + * into the array. + * + * @param buf The array of character to write from + * @param offset The offset into the array to start writing chars from + * @param count The number of chars to write. + * + * @exception IOException If an error occurs + */ + public void write (char[] buf, int offset, int count) throws IOException + { + synchronized (lock) + { + if (out == null) + throw new IOException("Stream closed"); + + if (wcount > 0) + { + writeChars(work, 0, wcount); + wcount = 0; + } + writeChars(buf, offset, count); + } + } + + /* + * Writes characters through to the inferior BufferedOutputStream. + * Ignores wcount and the work buffer. + */ + private void writeChars(char[] buf, int offset, int count) + throws IOException + { + do + { + // We must flush if out.count == out.buf.length. + // It is probably a good idea to flush if out.buf is almost full. + // This test is an approximation for "almost full". + if (out.count + count >= out.buf.length) + { + out.flush(); + if (out.count != 0) + throw new IOException("unable to flush output byte buffer"); + } + converter.setOutput(out.buf, out.count); + int converted = converter.write(buf, offset, count); + // Must set this before we flush the output stream, because + // flushing will reset 'out.count'. + out.count = converter.count; + // Flush if we cannot make progress. + if (converted == 0 && out.count == converter.count) + { + out.flush(); + if (out.count != 0) + throw new IOException("unable to flush output byte buffer"); + } + offset += converted; + count -= converted; + } + while (count > 0 || converter.havePendingBytes()); + } + + /** + * This method writes count bytes from the specified + * String starting at position offset into the + * String. + * + * @param str The String to write chars from + * @param offset The position in the String to start + * writing chars from + * @param count The number of chars to write + * + * @exception IOException If an error occurs + */ + public void write (String str, int offset, int count) throws IOException + { + synchronized (lock) + { + if (out == null) + throw new IOException("Stream closed"); + + if (work == null) + work = new char[100]; + int wlength = work.length; + while (count > 0) + { + int size = count; + if (wcount + size > wlength) + { + if (2*wcount > wlength) + { + writeChars(work, 0, wcount); + wcount = 0; + } + if (wcount + size > wlength) + size = wlength - wcount; + } + str.getChars(offset, offset+size, work, wcount); + offset += size; + count -= size; + wcount += size; + } + } + } + + /** + * This method writes a single character to the output stream. + * + * @param ch The char to write, passed as an int. + * + * @exception IOException If an error occurs + */ + public void write (int ch) throws IOException + { + synchronized (lock) + { + if (out == null) + throw new IOException("Stream closed"); + + if (work == null) + work = new char[100]; + if (wcount >= work.length) + { + writeChars(work, 0, wcount); + wcount = 0; + } + work[wcount++] = (char) ch; + } + } + +} // class OutputStreamWriter + -- cgit v1.2.3