15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* 25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved. 35267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) * Copyright (C) 2013 Google Inc. All Rights Reserved. 45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * Redistribution and use in source and binary forms, with or without 65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * modification, are permitted provided that the following conditions 75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * are met: 85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 1. Redistributions of source code must retain the above copyright 95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * notice, this list of conditions and the following disclaimer. 105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 2. Redistributions in binary form must reproduce the above copyright 115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * notice, this list of conditions and the following disclaimer in the 125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * documentation and/or other materials provided with the distribution. 135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * 145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 235c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 2402772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) */ 265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#ifndef PurgeableBuffer_h 285c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#define PurgeableBuffer_h 295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 305267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles)#include "wtf/OwnPtr.h" 315267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles)#include "wtf/PassOwnPtr.h" 321e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)#include "platform/PlatformExport.h" 335267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) 3451b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles)namespace blink { 355267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles)class WebDiscardableMemory; 365267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles)} 375c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)namespace WebCore { 395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 401e202183a5dc46166763171984b285173f8585e5Torne (Richard Coles)class PLATFORM_EXPORT PurgeableBuffer { 415267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) WTF_MAKE_NONCOPYABLE(PurgeableBuffer); 425267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles)public: 435267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) static PassOwnPtr<PurgeableBuffer> create(const char* data, size_t); 445267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) ~PurgeableBuffer(); 455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 465267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) // Call lock and check the return value before accessing the data. 475267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) const char* data() const; 485267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) size_t size() const { return m_size; } 495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 505267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) bool isPurgeable() const { return m_state != Locked; } 515267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) bool wasPurged() const; 525c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 535267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) bool lock(); 545267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) void unlock(); 555c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 565267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles)private: 575267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) enum State { 585267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) Locked, 595267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) Unlocked, 605267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) Purged 615c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) }; 625c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 6351b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) PurgeableBuffer(PassOwnPtr<blink::WebDiscardableMemory>, const char* data, size_t); 645267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) 6551b2906e11752df6c18351cf520e30522d3b53a1Torne (Richard Coles) OwnPtr<blink::WebDiscardableMemory> m_memory; 665267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) size_t m_size; 675267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) State m_state; 685267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles)}; 695267f701546148b83dfbe1d151cb184385bb5c22Torne (Richard Coles) 705c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)} 715c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 725c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)#endif 73