Security-222.tar.gz

[apple/security.git] / cdsa / cdsa_utilities / bufferfifo.h

diff --git a/cdsa/cdsa_utilities/bufferfifo.h b/cdsa/cdsa_utilities/bufferfifo.h
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--- a/cdsa/cdsa_utilities/bufferfifo.h
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-/*
- * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
- * 
- * The contents of this file constitute Original Code as defined in and are
- * subject to the Apple Public Source License Version 1.2 (the 'License').
- * You may not use this file except in compliance with the License. Please obtain
- * a copy of the License at http://www.apple.com/publicsource and read it before
- * using this file.
- * 
- * This Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
- * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
- * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
- * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
- * specific language governing rights and limitations under the License.
- */
-
-
-//
-// bufferfifo - a Sink that queues data in a FIFO of buffers for retrieval
-//
-#ifndef _H_BUFFERFIFO
-#define _H_BUFFERFIFO
-
-#include "streams.h"
-#include "buffers.h"
-#include <list>
-#include <queue>
-
-
-namespace Security {
-
-
-//
-// A BufferFifo acts as a First-in First-out queue of Buffer objects.
-// This is usually used as a flexible I/O buffer queue mechanism.
-// For convenience, a BufferFifo is a Sink, so you can push data
-// into it directly using the Sink mechanism.
-// Note that there is currently no mechanism for restricting the
-// memory footprint of a BufferFifo.
-//
-class BufferFifo : public Sink {
-public:
-    BufferFifo(size_t es = 4096) : bufferLength(es) { }
-    ~BufferFifo();
-    
-    Buffer *top() const                        { assert(!mBuffers.empty()); return mBuffers.front(); }
-    Buffer *pop();
-    void push(Buffer *b)               { mBuffers.push(b); }
-    
-    bool isEmpty() const               { return mBuffers.empty(); }
-    size_t size() const                        { return mBuffers.size(); }
-    size_t topLength() const   { assert(!isEmpty()); return mBuffers.front()->length(); }
-    
-    // Sink implementation
-    void consume(const void *data, size_t size);
-    void clearBuffer();
-
-private:
-    typedef queue< Buffer *, list<Buffer *> > BufferQueue;
-    BufferQueue mBuffers;
-    const size_t bufferLength;
-};
-
-
-
-}      // end namespace Security
-
-
-#endif /* _H_BUFFERFIFO */