1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90
|
/*
* Copyright (C) 2012 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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 ShareableResource_h
#define ShareableResource_h
#include "SharedMemory.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class SharedBuffer;
}
namespace WebKit {
class ShareableResource : public RefCounted<ShareableResource> {
public:
class Handle {
WTF_MAKE_NONCOPYABLE(Handle);
public:
Handle();
bool isNull() const { return m_handle.isNull(); }
unsigned size() const { return m_size; }
void encode(CoreIPC::ArgumentEncoder&) const;
static bool decode(CoreIPC::ArgumentDecoder&, Handle&);
PassRefPtr<WebCore::SharedBuffer> tryWrapInSharedBuffer() const;
private:
friend class ShareableResource;
mutable SharedMemory::Handle m_handle;
unsigned m_offset;
unsigned m_size;
};
// Create a shareable resource that uses malloced memory.
static PassRefPtr<ShareableResource> create(PassRefPtr<SharedMemory>, unsigned offset, unsigned size);
// Create a shareable resource from a handle.
static PassRefPtr<ShareableResource> create(const Handle&);
// Create a handle.
bool createHandle(Handle&);
~ShareableResource();
const char* data() const;
unsigned size() const;
private:
ShareableResource(PassRefPtr<SharedMemory>, unsigned offset, unsigned size);
RefPtr<SharedMemory> m_sharedMemory;
unsigned m_offset;
unsigned m_size;
};
} // namespace WebKit
#endif // ShareableResource_h
|