1/* 2 * Copyright (C) 2010 Google 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 are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31#include "config.h" 32 33#if ENABLE(BLOB) || ENABLE(FILE_SYSTEM) 34 35#include "FileStreamProxy.h" 36 37#include "Blob.h" 38#include "CrossThreadTask.h" 39#include "FileStream.h" 40#include "FileThread.h" 41#include "FileThreadTask.h" 42#include "PlatformString.h" 43#include "ScriptExecutionContext.h" 44 45namespace WebCore { 46 47inline FileStreamProxy::FileStreamProxy(ScriptExecutionContext* context, FileStreamClient* client) 48 : AsyncFileStream(client) 49 , m_context(context) 50 , m_stream(FileStream::create()) 51{ 52} 53 54PassRefPtr<FileStreamProxy> FileStreamProxy::create(ScriptExecutionContext* context, FileStreamClient* client) 55{ 56 RefPtr<FileStreamProxy> proxy = adoptRef(new FileStreamProxy(context, client)); 57 58 // Hold an ref so that the instance will not get deleted while there are tasks on the file thread. 59 // This is balanced by the deref in derefProxyOnContext below. 60 proxy->ref(); 61 62 proxy->fileThread()->postTask(createFileThreadTask(proxy.get(), &FileStreamProxy::startOnFileThread)); 63 64 return proxy.release(); 65} 66 67FileStreamProxy::~FileStreamProxy() 68{ 69} 70 71FileThread* FileStreamProxy::fileThread() 72{ 73 ASSERT(m_context->isContextThread()); 74 ASSERT(m_context->fileThread()); 75 return m_context->fileThread(); 76} 77 78static void didStart(ScriptExecutionContext*, FileStreamProxy* proxy) 79{ 80 if (proxy->client()) 81 proxy->client()->didStart(); 82} 83 84void FileStreamProxy::startOnFileThread() 85{ 86 if (!client()) 87 return; 88 m_stream->start(); 89 m_context->postTask(createCallbackTask(&didStart, this)); 90} 91 92void FileStreamProxy::stop() 93{ 94 // Clear the client so that we won't be calling callbacks on the client. 95 setClient(0); 96 97 fileThread()->unscheduleTasks(m_stream.get()); 98 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::stopOnFileThread)); 99} 100 101static void derefProxyOnContext(ScriptExecutionContext*, FileStreamProxy* proxy) 102{ 103 ASSERT(proxy->hasOneRef()); 104 proxy->deref(); 105} 106 107void FileStreamProxy::stopOnFileThread() 108{ 109 m_stream->stop(); 110 m_context->postTask(createCallbackTask(&derefProxyOnContext, this)); 111} 112 113static void didGetSize(ScriptExecutionContext*, FileStreamProxy* proxy, long long size) 114{ 115 if (proxy->client()) 116 proxy->client()->didGetSize(size); 117} 118 119void FileStreamProxy::getSize(const String& path, double expectedModificationTime) 120{ 121 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::getSizeOnFileThread, path, expectedModificationTime)); 122} 123 124void FileStreamProxy::getSizeOnFileThread(const String& path, double expectedModificationTime) 125{ 126 long long size = m_stream->getSize(path, expectedModificationTime); 127 m_context->postTask(createCallbackTask(&didGetSize, this, size)); 128} 129 130static void didOpen(ScriptExecutionContext*, FileStreamProxy* proxy, bool success) 131{ 132 if (proxy->client()) 133 proxy->client()->didOpen(success); 134} 135 136void FileStreamProxy::openForRead(const String& path, long long offset, long long length) 137{ 138 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::openForReadOnFileThread, path, offset, length)); 139} 140 141void FileStreamProxy::openForReadOnFileThread(const String& path, long long offset, long long length) 142{ 143 bool success = m_stream->openForRead(path, offset, length); 144 m_context->postTask(createCallbackTask(&didOpen, this, success)); 145} 146 147void FileStreamProxy::openForWrite(const String& path) 148{ 149 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::openForWriteOnFileThread, path)); 150} 151 152void FileStreamProxy::openForWriteOnFileThread(const String& path) 153{ 154 bool success = m_stream->openForWrite(path); 155 m_context->postTask(createCallbackTask(&didOpen, this, success)); 156} 157 158void FileStreamProxy::close() 159{ 160 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::closeOnFileThread)); 161} 162 163void FileStreamProxy::closeOnFileThread() 164{ 165 m_stream->close(); 166} 167 168static void didRead(ScriptExecutionContext*, FileStreamProxy* proxy, int bytesRead) 169{ 170 if (proxy->client()) 171 proxy->client()->didRead(bytesRead); 172} 173 174void FileStreamProxy::read(char* buffer, int length) 175{ 176 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::readOnFileThread, buffer, length)); 177} 178 179void FileStreamProxy::readOnFileThread(char* buffer, int length) 180{ 181 int bytesRead = m_stream->read(buffer, length); 182 m_context->postTask(createCallbackTask(&didRead, this, bytesRead)); 183} 184 185static void didWrite(ScriptExecutionContext*, FileStreamProxy* proxy, int bytesWritten) 186{ 187 if (proxy->client()) 188 proxy->client()->didWrite(bytesWritten); 189} 190 191void FileStreamProxy::write(const KURL& blobURL, long long position, int length) 192{ 193 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::writeOnFileThread, blobURL, position, length)); 194} 195 196void FileStreamProxy::writeOnFileThread(const KURL& blobURL, long long position, int length) 197{ 198 int bytesWritten = m_stream->write(blobURL, position, length); 199 m_context->postTask(createCallbackTask(&didWrite, this, bytesWritten)); 200} 201 202static void didTruncate(ScriptExecutionContext*, FileStreamProxy* proxy, bool success) 203{ 204 if (proxy->client()) 205 proxy->client()->didTruncate(success); 206} 207 208void FileStreamProxy::truncate(long long position) 209{ 210 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::truncateOnFileThread, position)); 211} 212 213void FileStreamProxy::truncateOnFileThread(long long position) 214{ 215 bool success = m_stream->truncate(position); 216 m_context->postTask(createCallbackTask(&didTruncate, this, success)); 217} 218 219} // namespace WebCore 220 221#endif // ENABLE(BLOB) || ENABLE(FILE_SYSTEM) 222