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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 FileReaderLoader_h
#define FileReaderLoader_h
#include "core/CoreExport.h"
#include "core/fileapi/FileError.h"
#include "core/loader/ThreadableLoaderClient.h"
#include "platform/heap/Handle.h"
#include "platform/weborigin/KURL.h"
#include "wtf/Forward.h"
#include "wtf/PtrUtil.h"
#include "wtf/text/TextEncoding.h"
#include "wtf/text/WTFString.h"
#include "wtf/typed_arrays/ArrayBufferBuilder.h"
#include <memory>
namespace blink {
class BlobDataHandle;
class DOMArrayBuffer;
class ExecutionContext;
class FileReaderLoaderClient;
class TextResourceDecoder;
class ThreadableLoader;
class CORE_EXPORT FileReaderLoader final : public ThreadableLoaderClient {
USING_FAST_MALLOC(FileReaderLoader);
public:
enum ReadType {
ReadAsArrayBuffer,
ReadAsBinaryString,
ReadAsText,
ReadAsDataURL,
ReadByClient
};
// If client is given, do the loading asynchronously. Otherwise, load
// synchronously.
static std::unique_ptr<FileReaderLoader> create(
ReadType readType,
FileReaderLoaderClient* client) {
return WTF::wrapUnique(new FileReaderLoader(readType, client));
}
~FileReaderLoader() override;
void start(ExecutionContext*, PassRefPtr<BlobDataHandle>);
void cancel();
// ThreadableLoaderClient
void didReceiveResponse(unsigned long,
const ResourceResponse&,
std::unique_ptr<WebDataConsumerHandle>) override;
void didReceiveData(const char*, unsigned) override;
void didFinishLoading(unsigned long, double) override;
void didFail(const ResourceError&) override;
DOMArrayBuffer* arrayBufferResult();
String stringResult();
// Returns the total bytes received. Bytes ignored by m_rawData won't be
// counted.
//
// This value doesn't grow more than numeric_limits<unsigned> when
// m_readType is not set to ReadByClient.
long long bytesLoaded() const { return m_bytesLoaded; }
// Before didReceiveResponse() is called: Returns -1.
// After didReceiveResponse() is called:
// - If the size of the resource is known (from
// m_response.expectedContentLength() or once didFinishLoading() is
// called), returns it.
// - Otherwise, returns -1.
long long totalBytes() const { return m_totalBytes; }
FileError::ErrorCode errorCode() const { return m_errorCode; }
void setEncoding(const String&);
void setDataType(const String& dataType) { m_dataType = dataType; }
private:
FileReaderLoader(ReadType, FileReaderLoaderClient*);
void cleanup();
void failed(FileError::ErrorCode);
void convertToText();
void convertToDataURL();
static FileError::ErrorCode httpStatusCodeToErrorCode(int);
ReadType m_readType;
FileReaderLoaderClient* m_client;
WTF::TextEncoding m_encoding;
String m_dataType;
KURL m_urlForReading;
Persistent<ThreadableLoader> m_loader;
std::unique_ptr<ArrayBufferBuilder> m_rawData;
bool m_isRawDataConverted;
Persistent<DOMArrayBuffer> m_arrayBufferResult;
String m_stringResult;
// The decoder used to decode the text data.
std::unique_ptr<TextResourceDecoder> m_decoder;
bool m_finishedLoading;
long long m_bytesLoaded;
// If the total size of the resource is unknown, m_totalBytes is set to -1
// until completion of loading, and the buffer for receiving data is set to
// dynamically grow. Otherwise, m_totalBytes is set to the total size and
// the buffer for receiving data of m_totalBytes is allocated and never grow
// even when extra data is appeneded.
long long m_totalBytes;
bool m_hasRange;
unsigned m_rangeStart;
unsigned m_rangeEnd;
FileError::ErrorCode m_errorCode;
};
} // namespace blink
#endif // FileReaderLoader_h
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