1 /* 2 * Copyright (C) 2010 Google Inc. All rights reserved. 3 * Copyright (C) 2010 Apple Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: 8 * 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * * Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following disclaimer 13 * in the documentation and/or other materials provided with the 14 * distribution. 15 * * Neither the name of Google Inc. nor the names of its 16 * contributors may be used to endorse or promote products derived from 17 * this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 23 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef FileStreamProxy_h 33 #define FileStreamProxy_h 34 35 #if ENABLE(BLOB) || ENABLE(FILE_SYSTEM) 36 37 #include "AsyncFileStream.h" 38 #include <wtf/Forward.h> 39 #include <wtf/PassRefPtr.h> 40 #include <wtf/RefCounted.h> 41 #include <wtf/RefPtr.h> 42 43 namespace WebCore { 44 45 class FileStream; 46 class FileThread; 47 class KURL; 48 class ScriptExecutionContext; 49 50 // A proxy module that asynchronously calls corresponding FileStream methods on the file thread. Note: you must call stop() first and then release the reference to destruct the FileStreamProxy instance. 51 class FileStreamProxy : public AsyncFileStream { 52 public: 53 static PassRefPtr<FileStreamProxy> create(ScriptExecutionContext*, FileStreamClient*); 54 virtual ~FileStreamProxy(); 55 56 virtual void getSize(const String& path, double expectedModificationTime); 57 virtual void openForRead(const String& path, long long offset, long long length); 58 virtual void openForWrite(const String& path); 59 virtual void close(); 60 virtual void read(char* buffer, int length); 61 virtual void write(const KURL& blobURL, long long position, int length); 62 virtual void truncate(long long position); 63 64 // Stops the proxy and scedules it to be destructed. All the pending tasks will be aborted and the file stream will be closed. 65 // Note: the caller should deref the instance immediately after calling stop(). 66 virtual void stop(); 67 68 private: 69 FileStreamProxy(ScriptExecutionContext*, FileStreamClient*); 70 71 FileThread* fileThread(); 72 73 // Called on File thread. 74 void startOnFileThread(); 75 void stopOnFileThread(); 76 void getSizeOnFileThread(const String& path, double expectedModificationTime); 77 void openForReadOnFileThread(const String& path, long long offset, long long length); 78 void openForWriteOnFileThread(const String& path); 79 void closeOnFileThread(); 80 void readOnFileThread(char* buffer, int length); 81 void writeOnFileThread(const KURL& blobURL, long long position, int length); 82 void truncateOnFileThread(long long position); 83 84 RefPtr<ScriptExecutionContext> m_context; 85 RefPtr<FileStream> m_stream; 86 }; 87 88 } // namespace WebCore 89 90 #endif // ENABLE(BLOB) || ENABLE(FILE_SYSTEM) 91 92 #endif // FileStreamProxy_h 93
