/*
* Copyright (C) 2012 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef WebSocketDeflater_h
#define WebSocketDeflater_h
#include "wtf/Noncopyable.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassOwnPtr.h"
#include "wtf/Vector.h"
struct z_stream_s;
typedef z_stream_s z_stream;
namespace WebCore {
class WebSocketDeflater {
WTF_MAKE_FAST_ALLOCATED;
public:
// This enum is reused for histogram. When this needs to be modified, add a
// new enum for histogram and convert mode values into values in the new
// enum to keep new data consistent with old one.
enum ContextTakeOverMode {
DoNotTakeOverContext,
TakeOverContext,
ContextTakeOverModeMax,
};
static PassOwnPtr<WebSocketDeflater> create(int windowBits, ContextTakeOverMode = TakeOverContext);
~WebSocketDeflater();
bool initialize();
bool addBytes(const char*, size_t);
bool finish();
const char* data() { return m_buffer.data(); }
size_t size() const { return m_buffer.size(); }
// Reset the deflate result.
void softReset();
// Reset the deflate result and internal state if the take over mode is DoNotTakeOverContext.
void reset();
private:
WebSocketDeflater(int windowBits, ContextTakeOverMode);
int m_windowBits;
ContextTakeOverMode m_contextTakeOverMode;
bool m_isBytesAdded;
Vector<char> m_buffer;
OwnPtr<z_stream> m_stream;
};
class WebSocketInflater {
WTF_MAKE_FAST_ALLOCATED;
public:
static PassOwnPtr<WebSocketInflater> create(int windowBits = 15);
~WebSocketInflater();
bool initialize();
bool addBytes(const char*, size_t);
bool finish();
const char* data() { return m_buffer.data(); }
size_t size() const { return m_buffer.size(); }
// Reset the inflate result.
void reset();
private:
explicit WebSocketInflater(int windowBits);
int m_windowBits;
Vector<char> m_buffer;
OwnPtr<z_stream> m_stream;
};
}
#endif // WebSocketDeflater_h