1 files changed, 227 insertions, 0 deletions
diff --git a/Source/WebCore/fileapi/AsyncFileStream.cpp b/Source/WebCore/fileapi/AsyncFileStream.cpp
new file mode 100644
index 000000000..1b035ccc3
--- /dev/null
+++ b/Source/WebCore/fileapi/AsyncFileStream.cpp
@@ -0,0 +1,227 @@
+/*
+ * Copyright (C) 2010 Google Inc.  All rights reserved.
+ * Copyright (C) 2012 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#if ENABLE(BLOB)
+
+#include "AsyncFileStream.h"
+
+#include "Blob.h"
+#include "CrossThreadTask.h"
+#include "FileStream.h"
+#include "FileStreamClient.h"
+#include "FileThread.h"
+#include "FileThreadTask.h"
+#include "PlatformString.h"
+#include "ScriptExecutionContext.h"
+
+namespace WebCore {
+
+inline AsyncFileStream::AsyncFileStream(ScriptExecutionContext* context, FileStreamClient* client)
+    : m_context(context)
+    , m_stream(FileStream::create())
+    , m_client(client)
+{
+}
+
+PassRefPtr<AsyncFileStream> AsyncFileStream::create(ScriptExecutionContext* context, FileStreamClient* client)
+{
+    RefPtr<AsyncFileStream> proxy = adoptRef(new AsyncFileStream(context, client));
+
+    // Hold a reference so that the instance will not get deleted while there are tasks on the file thread.
+    // This is balanced by the deref in derefProxyOnContext below.
+    proxy->ref();
+
+    proxy->fileThread()->postTask(createFileThreadTask(proxy.get(), &AsyncFileStream::startOnFileThread));
+
+    return proxy.release();
+}
+
+AsyncFileStream::~AsyncFileStream()
+{
+}
+
+FileThread* AsyncFileStream::fileThread()
+{
+    ASSERT(m_context->isContextThread());
+    ASSERT(m_context->fileThread());
+    return m_context->fileThread();
+}
+
+static void didStart(ScriptExecutionContext*, AsyncFileStream* proxy)
+{
+    if (proxy->client())
+        proxy->client()->didStart();
+}
+
+void AsyncFileStream::startOnFileThread()
+{
+    if (!client())
+        return;
+    m_stream->start();
+    m_context->postTask(createCallbackTask(&didStart, AllowCrossThreadAccess(this)));
+}
+
+void AsyncFileStream::stop()
+{
+    // Clear the client so that we won't be calling callbacks on the client.
+    setClient(0);
+
+    fileThread()->unscheduleTasks(m_stream.get());
+    fileThread()->postTask(createFileThreadTask(this, &AsyncFileStream::stopOnFileThread));
+}
+
+static void derefProxyOnContext(ScriptExecutionContext*, AsyncFileStream* proxy)
+{
+    ASSERT(proxy->hasOneRef());
+    proxy->deref();
+}
+
+void AsyncFileStream::stopOnFileThread()
+{
+    m_stream->stop();
+    m_context->postTask(createCallbackTask(&derefProxyOnContext, AllowCrossThreadAccess(this)));
+}
+
+static void didGetSize(ScriptExecutionContext*, AsyncFileStream* proxy, long long size)
+{
+    if (proxy->client())
+        proxy->client()->didGetSize(size);
+}
+
+void AsyncFileStream::getSize(const String& path, double expectedModificationTime)
+{
+    fileThread()->postTask(createFileThreadTask(this, &AsyncFileStream::getSizeOnFileThread, path, expectedModificationTime));
+}
+
+void AsyncFileStream::getSizeOnFileThread(const String& path, double expectedModificationTime)
+{
+    long long size = m_stream->getSize(path, expectedModificationTime);
+    m_context->postTask(createCallbackTask(&didGetSize, AllowCrossThreadAccess(this), size));
+}
+
+static void didOpen(ScriptExecutionContext*, AsyncFileStream* proxy, bool success)
+{
+    if (proxy->client())
+        proxy->client()->didOpen(success);
+}
+
+void AsyncFileStream::openForRead(const String& path, long long offset, long long length)
+{
+    fileThread()->postTask(createFileThreadTask(this, &AsyncFileStream::openForReadOnFileThread, path, offset, length));
+}
+
+void AsyncFileStream::openForReadOnFileThread(const String& path, long long offset, long long length)
+{
+    bool success = m_stream->openForRead(path, offset, length);
+    m_context->postTask(createCallbackTask(&didOpen, AllowCrossThreadAccess(this), success));
+}
+
+void AsyncFileStream::openForWrite(const String& path)
+{
+    fileThread()->postTask(
+        createFileThreadTask(this,
+                             &AsyncFileStream::openForWriteOnFileThread, path));
+}
+
+void AsyncFileStream::openForWriteOnFileThread(const String& path)
+{
+    bool success = m_stream->openForWrite(path);
+    m_context->postTask(createCallbackTask(&didOpen, AllowCrossThreadAccess(this), success));
+}
+
+void AsyncFileStream::close()
+{
+    fileThread()->postTask(createFileThreadTask(this, &AsyncFileStream::closeOnFileThread));
+}
+
+void AsyncFileStream::closeOnFileThread()
+{
+    m_stream->close();
+}
+
+static void didRead(ScriptExecutionContext*, AsyncFileStream* proxy, int bytesRead)
+{
+    if (proxy->client())
+        proxy->client()->didRead(bytesRead);
+}
+
+void AsyncFileStream::read(char* buffer, int length)
+{
+    fileThread()->postTask(
+        createFileThreadTask(this, &AsyncFileStream::readOnFileThread,
+                             AllowCrossThreadAccess(buffer), length));
+}
+
+void AsyncFileStream::readOnFileThread(char* buffer, int length)
+{
+    int bytesRead = m_stream->read(buffer, length);
+    m_context->postTask(createCallbackTask(&didRead, AllowCrossThreadAccess(this), bytesRead));
+}
+
+static void didWrite(ScriptExecutionContext*, AsyncFileStream* proxy, int bytesWritten)
+{
+    if (proxy->client())
+        proxy->client()->didWrite(bytesWritten);
+}
+
+void AsyncFileStream::write(const KURL& blobURL, long long position, int length)
+{
+    fileThread()->postTask(createFileThreadTask(this, &AsyncFileStream::writeOnFileThread, blobURL, position, length));
+}
+
+void AsyncFileStream::writeOnFileThread(const KURL& blobURL, long long position, int length)
+{
+    int bytesWritten = m_stream->write(blobURL, position, length);
+    m_context->postTask(createCallbackTask(&didWrite, AllowCrossThreadAccess(this), bytesWritten));
+}
+
+static void didTruncate(ScriptExecutionContext*, AsyncFileStream* proxy, bool success)
+{
+    if (proxy->client())
+        proxy->client()->didTruncate(success);
+}
+
+void AsyncFileStream::truncate(long long position)
+{
+    fileThread()->postTask(createFileThreadTask(this, &AsyncFileStream::truncateOnFileThread, position));
+}
+
+void AsyncFileStream::truncateOnFileThread(long long position)
+{
+    bool success = m_stream->truncate(position);
+    m_context->postTask(createCallbackTask(&didTruncate, AllowCrossThreadAccess(this), success));
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(BLOB)