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 45 namespace WebCore { 46 47 inline FileStreamProxy::FileStreamProxy(ScriptExecutionContext* context, FileStreamClient* client) 48 : AsyncFileStream(client) 49 , m_context(context) 50 , m_stream(FileStream::create()) 51 { 52 } 53 54 PassRefPtr<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 67 FileStreamProxy::~FileStreamProxy() 68 { 69 } 70 71 FileThread* FileStreamProxy::fileThread() 72 { 73 ASSERT(m_context->isContextThread()); 74 ASSERT(m_context->fileThread()); 75 return m_context->fileThread(); 76 } 77 78 static void didStart(ScriptExecutionContext*, FileStreamProxy* proxy) 79 { 80 if (proxy->client()) 81 proxy->client()->didStart(); 82 } 83 84 void FileStreamProxy::startOnFileThread() 85 { 86 if (!client()) 87 return; 88 m_stream->start(); 89 m_context->postTask(createCallbackTask(&didStart, this)); 90 } 91 92 void 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 } 100 101 static void derefProxyOnContext(ScriptExecutionContext*, FileStreamProxy* proxy) 102 { 103 ASSERT(proxy->hasOneRef()); 104 proxy->deref(); 105 } 106 107 void FileStreamProxy::stopOnFileThread() 108 { 109 m_stream->stop(); 110 m_context->postTask(createCallbackTask(&derefProxyOnContext, this)); 111 } 112 113 static void didGetSize(ScriptExecutionContext*, FileStreamProxy* proxy, long long size) 114 { 115 if (proxy->client()) 116 proxy->client()->didGetSize(size); 117 } 118 119 void FileStreamProxy::getSize(const String& path, double expectedModificationTime) 120 { 121 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::getSizeOnFileThread, path, expectedModificationTime)); 122 } 123 124 void 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 } 129 130 static void didOpen(ScriptExecutionContext*, FileStreamProxy* proxy, bool success) 131 { 132 if (proxy->client()) 133 proxy->client()->didOpen(success); 134 } 135 136 void FileStreamProxy::openForRead(const String& path, long long offset, long long length) 137 { 138 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::openForReadOnFileThread, path, offset, length)); 139 } 140 141 void 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 } 146 147 void FileStreamProxy::openForWrite(const String& path) 148 { 149 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::openForWriteOnFileThread, path)); 150 } 151 152 void FileStreamProxy::openForWriteOnFileThread(const String& path) 153 { 154 bool success = m_stream->openForWrite(path); 155 m_context->postTask(createCallbackTask(&didOpen, this, success)); 156 } 157 158 void FileStreamProxy::close() 159 { 160 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::closeOnFileThread)); 161 } 162 163 void FileStreamProxy::closeOnFileThread() 164 { 165 m_stream->close(); 166 } 167 168 static void didRead(ScriptExecutionContext*, FileStreamProxy* proxy, int bytesRead) 169 { 170 if (proxy->client()) 171 proxy->client()->didRead(bytesRead); 172 } 173 174 void FileStreamProxy::read(char* buffer, int length) 175 { 176 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::readOnFileThread, buffer, length)); 177 } 178 179 void FileStreamProxy::readOnFileThread(char* buffer, int length) 180 { 181 int bytesRead = m_stream->read(buffer, length); 182 m_context->postTask(createCallbackTask(&didRead, this, bytesRead)); 183 } 184 185 static void didWrite(ScriptExecutionContext*, FileStreamProxy* proxy, int bytesWritten) 186 { 187 if (proxy->client()) 188 proxy->client()->didWrite(bytesWritten); 189 } 190 191 void FileStreamProxy::write(const KURL& blobURL, long long position, int length) 192 { 193 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::writeOnFileThread, blobURL, position, length)); 194 } 195 196 void 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 } 201 202 static void didTruncate(ScriptExecutionContext*, FileStreamProxy* proxy, bool success) 203 { 204 if (proxy->client()) 205 proxy->client()->didTruncate(success); 206 } 207 208 void FileStreamProxy::truncate(long long position) 209 { 210 fileThread()->postTask(createFileThreadTask(this, &FileStreamProxy::truncateOnFileThread, position)); 211 } 212 213 void 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
