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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/xml/stream/BufferedReader.java
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diff --git a/libjava/classpath/gnu/xml/stream/BufferedReader.java b/libjava/classpath/gnu/xml/stream/BufferedReader.java
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+/* BufferedReader.java --
+ Copyright (C) 2005 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 gnu.xml.stream;
+
+import java.io.IOException;
+import java.io.Reader;
+
+/**
+ * A mark-capable buffered reader.
+ *
+ * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
+ */
+class BufferedReader
+ extends Reader
+{
+
+ static final int DEFAULT_BUFFER_SIZE = 4096;
+
+ final Reader in;
+ char[] buf;
+ int pos, count, markpos, marklimit, bufferSize;
+
+ BufferedReader(Reader in)
+ {
+ this(in, DEFAULT_BUFFER_SIZE);
+ }
+
+ BufferedReader(Reader in, int bufferSize)
+ {
+ if (bufferSize < 1)
+ throw new IllegalArgumentException();
+ this.in = in;
+ this.bufferSize = bufferSize;
+ buf = new char[bufferSize];
+ pos = count = bufferSize;
+ }
+
+ public void close()
+ throws IOException
+ {
+ buf = null;
+ pos = count = 0;
+ markpos = -1;
+ in.close();
+ }
+
+ public void mark(int readlimit)
+ throws IOException
+ {
+ marklimit = readlimit;
+ markpos = pos;
+ }
+
+ public boolean markSupported()
+ {
+ return true;
+ }
+
+ public int read()
+ throws IOException
+ {
+ if (pos >= count && !refill())
+ return -1;
+ return (int) buf[pos++];
+ }
+
+ public int read(char[] b)
+ throws IOException
+ {
+ return read(b, 0, b.length);
+ }
+
+ public int read(char[] b, int off, int len)
+ throws IOException
+ {
+ if (off < 0 || len < 0 || b.length - off < len)
+ throw new IndexOutOfBoundsException();
+
+ if (len == 0)
+ return 0;
+
+ if (pos >= count && !refill())
+ return -1;
+
+ int ret = Math.min(count - pos, len);
+ System.arraycopy(buf, pos, b, off, ret);
+ pos += ret;
+ off += ret;
+ len -= ret;
+
+ while (len > 0 && refill())
+ {
+ int remain = Math.min(count - pos, len);
+ System.arraycopy(buf, pos, b, off, remain);
+ pos += remain;
+ off += remain;
+ len -= remain;
+ ret += remain;
+ }
+
+ return ret;
+ }
+
+ public void reset()
+ throws IOException
+ {
+ if (markpos == -1)
+ throw new IOException(buf == null ? "Stream closed." : "Invalid mark.");
+ pos = markpos;
+ }
+
+ public long skip(long n)
+ throws IOException
+ {
+ if (buf == null)
+ throw new IOException("Stream closed.");
+ final long origN = n;
+ while (n > 0L)
+ {
+ if (pos >= count && !refill())
+ break;
+ int numread = (int) Math.min((long) (count - pos), n);
+ pos += numread;
+ n -= numread;
+ }
+ return origN - n;
+ }
+
+ private boolean refill()
+ throws IOException
+ {
+ if (buf == null)
+ throw new IOException("Stream closed.");
+
+ int markcount = count - markpos;
+ if (markpos == -1 || markcount >= marklimit)
+ {
+ markpos = -1;
+ pos = count = 0;
+ }
+ else
+ {
+ char[] newbuf = buf;
+ if (markpos < bufferSize)
+ {
+ newbuf = new char[count - markpos + bufferSize];
+ }
+ System.arraycopy(buf, markpos, newbuf, 0, markcount);
+ buf = newbuf;
+ count = markcount;
+ pos -= markpos;
+ markpos = 0;
+ }
+
+ int numread = in.read(buf, count, bufferSize);
+ if (numread <= 0)
+ return false;
+
+ count += numread;
+ return true;
+ }
+
+}