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