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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/security/util/ByteBufferOutputStream.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/security/util/ByteBufferOutputStream.java')
-rw-r--r-- | libjava/classpath/gnu/java/security/util/ByteBufferOutputStream.java | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/security/util/ByteBufferOutputStream.java b/libjava/classpath/gnu/java/security/util/ByteBufferOutputStream.java new file mode 100644 index 000000000..642ccdf68 --- /dev/null +++ b/libjava/classpath/gnu/java/security/util/ByteBufferOutputStream.java @@ -0,0 +1,118 @@ +/* ByteBufferOutputStream.java -- output stream with a growable underlying + byte buffer. + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is a 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 of the License, 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; if not, write to the Free Software +Foundation, Inc., 51 Franklin St, 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.java.security.util; + +import java.io.IOException; +import java.io.OutputStream; + +import java.nio.ByteBuffer; + +/** + * An output stream that writes bytes to a ByteBuffer, which will be resized + * if more space is needed. + * + * @author Casey Marshall (csm@gnu.org) + */ +public class ByteBufferOutputStream extends OutputStream +{ + private ByteBuffer buffer; + + public ByteBufferOutputStream() + { + this(256); + } + + public ByteBufferOutputStream(int initialCapacity) + { + buffer = ByteBuffer.allocate(initialCapacity); + } + + /* (non-Javadoc) + * @see java.io.OutputStream#write(int) + */ + public @Override synchronized void write(int b) throws IOException + { + if (!buffer.hasRemaining()) + growBuffer(); + buffer.put((byte) b); + } + + public @Override synchronized void write(byte[] b, int offset, int length) + { + if (buffer.remaining() < length) + growBuffer(); + buffer.put(b, offset, length); + } + + public @Override void write(byte[] b) + { + write(b, 0, b.length); + } + + /** + * Get the current state of the buffer. The returned buffer will have + * its position set to zero, its capacity set to the current limit, + * and its limit set to its capacity. + * + * @return The buffer. + */ + public ByteBuffer buffer() + { + return ((ByteBuffer) buffer.duplicate().flip()).slice(); + } + + public String toString() + { + return super.toString() + " [ buffer: " + buffer + " ]"; + } + + private void growBuffer() + { + int newCapacity = buffer.capacity(); + if (newCapacity < 16384) // If the buffer isn't huge yet, double its size + newCapacity = newCapacity << 1; + else // Otherwize, increment by a bit. + newCapacity += 4096; + ByteBuffer newBuffer = ByteBuffer.allocate(newCapacity); + buffer.flip(); + newBuffer.put(buffer); + buffer = newBuffer; + } +} |