WebSocketDeflateFramer.h   [plain text]

/*
 * 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,
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 */

#ifndef WebSocketDeflateFramer_h
#define WebSocketDeflateFramer_h

#if ENABLE(WEB_SOCKETS)

#if USE(ZLIB)
#include "WebSocketDeflater.h"
#endif
#include "WebSocketExtensionProcessor.h"
#include "WebSocketFrame.h"
#include <wtf/OwnPtr.h>
#include <wtf/PassOwnPtr.h>

namespace WebCore {

class WebSocketDeflateFramer;

class DeflateResultHolder {
public:
    static PassOwnPtr<DeflateResultHolder> create(WebSocketDeflateFramer* framer)
    {
        return adoptPtr(new DeflateResultHolder(framer));
    }

    ~DeflateResultHolder();

    bool succeeded() const { return m_succeeded; }
    String failureReason() const { return m_failureReason; }

    void fail(const String& failureReason);

private:
    explicit DeflateResultHolder(WebSocketDeflateFramer*);

    WebSocketDeflateFramer* m_framer;
    bool m_succeeded;
    String m_failureReason;
};

class InflateResultHolder {
public:
    static PassOwnPtr<InflateResultHolder> create(WebSocketDeflateFramer* framer)
    {
        return adoptPtr(new InflateResultHolder(framer));
    }

    ~InflateResultHolder();

    bool succeeded() const { return m_succeeded; }
    String failureReason() const { return m_failureReason; }

    void fail(const String& failureReason);

private:
    explicit InflateResultHolder(WebSocketDeflateFramer*);

    WebSocketDeflateFramer* m_framer;
    bool m_succeeded;
    String m_failureReason;
};

class WebSocketDeflateFramer {
public:
    WebSocketDeflateFramer();

    PassOwnPtr<WebSocketExtensionProcessor> createExtensionProcessor();

    bool canDeflate() const;
    bool enabled() const { return m_enabled; }

    PassOwnPtr<DeflateResultHolder> deflate(WebSocketFrame&);
    void resetDeflateContext();
    PassOwnPtr<InflateResultHolder> inflate(WebSocketFrame&);
    void resetInflateContext();

    void didFail();

#if USE(ZLIB)
    void enableDeflate(int windowBits, WebSocketDeflater::ContextTakeOverMode);
#endif

private:
    bool m_enabled;
#if USE(ZLIB)
    OwnPtr<WebSocketDeflater> m_deflater;
    OwnPtr<WebSocketInflater> m_inflater;
#endif
};

}

#endif // ENABLE(WEB_SOCKETS)

#endif // WebSocketDeflateFramer_h