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/*
* Copyright (C) 2010 Google 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.
*/
#ifndef FileReader_h
#define FileReader_h
#if ENABLE(BLOB)
#include "ActiveDOMObject.h"
#include "EventTarget.h"
#include "FileError.h"
#include "FileStreamClient.h"
#include "PlatformString.h"
#include "ScriptString.h"
#include "TextEncoding.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/Vector.h>
namespace WebCore {
class Blob;
class File;
class FileStreamProxy;
class ScriptExecutionContext;
class TextResourceDecoder;
class FileReader : public RefCounted<FileReader>, public ActiveDOMObject, public EventTarget, public FileStreamClient {
public:
static PassRefPtr<FileReader> create(ScriptExecutionContext* context)
{
return adoptRef(new FileReader(context));
}
virtual ~FileReader();
enum ReadyState {
EMPTY = 0,
LOADING = 1,
DONE = 2
};
void readAsBinaryString(Blob*);
void readAsText(Blob*, const String& encoding = "");
void readAsDataURL(File*);
void abort();
ReadyState readyState() const;
PassRefPtr<FileError> error() { return m_error; }
const ScriptString& result();
// ActiveDOMObject
virtual bool canSuspend() const;
virtual void stop();
virtual bool hasPendingActivity() const;
// EventTarget
virtual FileReader* toFileReader() { return this; }
virtual ScriptExecutionContext* scriptExecutionContext() const { return ActiveDOMObject::scriptExecutionContext(); }
// FileStreamClient
virtual void didStart();
virtual void didGetSize(long long);
virtual void didOpen(bool);
virtual void didRead(int);
using RefCounted<FileReader>::ref;
using RefCounted<FileReader>::deref;
DEFINE_ATTRIBUTE_EVENT_LISTENER(loadstart);
DEFINE_ATTRIBUTE_EVENT_LISTENER(progress);
DEFINE_ATTRIBUTE_EVENT_LISTENER(load);
DEFINE_ATTRIBUTE_EVENT_LISTENER(abort);
DEFINE_ATTRIBUTE_EVENT_LISTENER(error);
DEFINE_ATTRIBUTE_EVENT_LISTENER(loadend);
private:
enum ReadType {
ReadFileAsBinaryString,
ReadFileAsText,
ReadFileAsDataURL
};
enum InternalState {
None,
Starting,
Opening,
Reading,
Completed
};
FileReader(ScriptExecutionContext*);
// EventTarget
virtual void refEventTarget() { ref(); }
virtual void derefEventTarget() { deref(); }
virtual EventTargetData* eventTargetData() { return &m_eventTargetData; }
virtual EventTargetData* ensureEventTargetData() { return &m_eventTargetData; }
void terminate();
void readInternal(Blob*, ReadType);
void fireEvent(const AtomicString& type);
void convertToText();
void convertToDataURL();
void didFinish();
void didFail(ExceptionCode);
InternalState m_state;
EventTargetData m_eventTargetData;
RefPtr<Blob> m_fileBlob;
ReadType m_readType;
TextEncoding m_encoding;
// Like XMLHttpRequest.m_responseText, we keep this as a ScriptString, not a WTF::String.
// That's because these strings can easily get huge (they are filled from the file) and
// because JS can easily observe many intermediate states, so it's very useful to be
// able to share the buffer with JavaScript versions of the whole or partial string.
// In contrast, this string doesn't interact much with the rest of the engine so it's not that
// big a cost that it isn't a String.
ScriptString m_result;
// The raw data. We have to keep track of all the raw data for it to be converted to text or data URL data.
Vector<char> m_rawData;
bool m_isRawDataConverted;
// The decoder used to decode the text data.
RefPtr<TextResourceDecoder> m_decoder;
// Needed to create data URL.
String m_fileType;
RefPtr<FileStreamProxy> m_streamProxy;
Vector<char> m_buffer;
RefPtr<FileError> m_error;
long long m_bytesLoaded;
long long m_totalBytes;
double m_lastProgressNotificationTimeMS;
};
} // namespace WebCore
#endif // ENABLE(BLOB)
#endif // FileReader_h
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