238 lines
5.4 KiB
Java
238 lines
5.4 KiB
Java
/* ReaderInputStream.java --
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Copyright (C) 1999, 2000, 2001, 2004 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 gnu.xml.dom.ls;
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import java.io.InputStream;
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import java.io.IOException;
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import java.io.Reader;
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/**
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* Character stream wrapper.
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*
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* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
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* @author <a href='mailto:mark@klomp.org'>Mark Wielaard</a>
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*/
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public class ReaderInputStream
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extends InputStream
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{
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private Reader reader;
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private String encoding;
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// Holds extra spillover data if necessary
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private byte extra[];
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private int pos;
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private byte extra_marked[];
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private int pos_marked;
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public ReaderInputStream(Reader reader)
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{
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this.reader = reader;
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this.encoding = "UTF-8";
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}
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void setEncoding(String encoding)
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{
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this.encoding = encoding;
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}
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public int read()
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throws IOException
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{
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if (extra != null)
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{
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int result = extra[pos];
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pos++;
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if (pos >= extra.length)
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{
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extra = null;
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}
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return result;
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}
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return reader.read();
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}
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public int read(byte[] b)
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throws IOException
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{
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return read(b, 0, b.length);
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}
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public int read(byte[] b, int off, int len)
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throws IOException
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{
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if (len == 0)
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{
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return 0;
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}
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if (extra != null)
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{
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int available = extra.length - pos;
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int l = available < len ? available : len;
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System.arraycopy(extra, 0, b, off, l);
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pos += l;
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if (pos >= extra.length)
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{
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extra = null;
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}
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return l;
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}
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char[] c = new char[len];
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int l = reader.read(c, 0, len);
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if (l == -1)
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{
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return -1;
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}
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String s = new String(c, 0, l);
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byte[] d = s.getBytes(encoding);
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int available = d.length;
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int more = d.length - len;
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if (more > 0)
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{
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extra = new byte[more];
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pos = 0;
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System.arraycopy(d, len, extra, 0, more);
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available -= more;
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}
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System.arraycopy(d, 0, b, off, available);
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return available;
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}
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public void close()
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throws IOException
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{
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reader.close();
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}
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public boolean markSupported()
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{
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return reader.markSupported();
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}
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public void mark(int limit)
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{
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if (extra != null)
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{
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extra_marked = new byte[extra.length];
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System.arraycopy(extra, 0, extra_marked, 0, extra.length);
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pos_marked = pos;
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}
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else
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{
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extra_marked = null;
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}
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try
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{
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// Note that this might be a bit more than asked for.
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// Because we might also have the extra_marked bytes.
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// That is fine (and necessary for reset() to work).
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reader.mark(limit);
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}
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catch (IOException ioe)
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{
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throw new RuntimeException(ioe);
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}
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}
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public void reset()
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throws IOException
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{
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extra = extra_marked;
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pos = pos_marked;
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extra_marked = null;
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reader.reset();
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}
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public long skip(long n)
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throws IOException
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{
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long done = 0;
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if (extra != null)
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{
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int available = extra.length - pos;
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done = available < n ? available : n;
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pos += done;
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if (pos >= extra.length)
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{
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extra = null;
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}
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}
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n -= done;
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if (n > 0)
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{
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return reader.skip(n) + done;
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}
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else
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{
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return done;
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}
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}
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/**
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* Returns conservative number of bytes available without blocking.
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* Actual number of bytes that can be read without blocking might
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* be (much) bigger.
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*/
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public int available()
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throws IOException
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{
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if (extra != null)
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{
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return pos - extra.length;
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}
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return reader.ready() ? 1 : 0;
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}
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public String toString()
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{
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return getClass().getName() + "[" + reader + ", " + encoding + "]";
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}
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}
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