1/* 2 * Copyright (C) 2012 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef ShareableResource_h 27#define ShareableResource_h 28 29#include "SharedMemory.h" 30 31#include <wtf/PassRefPtr.h> 32#include <wtf/RefCounted.h> 33#include <wtf/RefPtr.h> 34 35namespace WebCore { 36class SharedBuffer; 37} 38 39namespace WebKit { 40 41class ShareableResource : public RefCounted<ShareableResource> { 42public: 43 44 class Handle { 45 WTF_MAKE_NONCOPYABLE(Handle); 46 public: 47 Handle(); 48 49 bool isNull() const { return m_handle.isNull(); } 50 unsigned size() const { return m_size; } 51 52 void encode(CoreIPC::ArgumentEncoder&) const; 53 static bool decode(CoreIPC::ArgumentDecoder&, Handle&); 54 55 PassRefPtr<WebCore::SharedBuffer> tryWrapInSharedBuffer() const; 56 57 private: 58 friend class ShareableResource; 59 60 mutable SharedMemory::Handle m_handle; 61 unsigned m_offset; 62 unsigned m_size; 63 }; 64 65 // Create a shareable resource that uses malloced memory. 66 static PassRefPtr<ShareableResource> create(PassRefPtr<SharedMemory>, unsigned offset, unsigned size); 67 68 // Create a shareable resource from a handle. 69 static PassRefPtr<ShareableResource> create(const Handle&); 70 71 // Create a handle. 72 bool createHandle(Handle&); 73 74 ~ShareableResource(); 75 76 const char* data() const; 77 unsigned size() const; 78 79private: 80 ShareableResource(PassRefPtr<SharedMemory>, unsigned offset, unsigned size); 81 82 RefPtr<SharedMemory> m_sharedMemory; 83 84 unsigned m_offset; 85 unsigned m_size; 86}; 87 88} // namespace WebKit 89 90#endif // ShareableResource_h 91