mirror of git://gcc.gnu.org/git/gcc.git
128 lines
3.3 KiB
Java
128 lines
3.3 KiB
Java
/* MeteredInputStream.java --
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Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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This file is a 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 of the License, or (at
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your option) 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; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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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.javax.crypto.keyring;
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import java.io.FilterInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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final class MeteredInputStream
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extends FilterInputStream
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{
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private int count;
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private final int limit;
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MeteredInputStream(InputStream in, int limit)
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{
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super(in);
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if (limit < 0)
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throw new IllegalArgumentException("limit must be nonnegative");
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this.limit = limit;
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count = 0;
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}
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/**
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* Tests if the number of bytes read has reached the limit.
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*
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* @return True if the limit has been reached.
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*/
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public boolean limitReached()
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{
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return count == limit;
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}
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public int available() throws IOException
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{
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return Math.min(in.available(), limit - count);
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}
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public void close() throws IOException
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{
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in.close();
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}
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public void mark(int readLimit)
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{
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}
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public boolean markSupported()
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{
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return false;
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}
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public int read() throws IOException
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{
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if (limitReached())
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return -1;
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int i = in.read();
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if (i != -1)
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count++;
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return i;
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}
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public int read(byte[] buf) throws IOException
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{
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return read(buf, 0, buf.length);
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}
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public int read(byte[] buf, int off, int len) throws IOException
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{
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if (limitReached())
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return -1;
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int i = in.read(buf, off, Math.min(len, limit - count));
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if (i != -1)
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count += i;
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return i;
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}
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public void reset() throws IOException
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{
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}
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public long skip(long len) throws IOException
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{
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if (limitReached())
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return 0L;
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len = Math.min(len, limit - count);
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len = in.skip(len);
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count += (int) len;
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return len;
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}
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}
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