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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 THIRD_PARTY_BLINK_RENDERER_MODULES_FILESYSTEM_FILE_WRITER_BASE_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_FILESYSTEM_FILE_WRITER_BASE_H_
#include "base/files/file.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/weborigin/kurl.h"
namespace blink {
class Blob;
class MODULES_EXPORT FileWriterBase : public GarbageCollectedMixin {
public:
virtual ~FileWriterBase();
void Initialize(const KURL& path, int64_t length);
int64_t position() const { return position_; }
int64_t length() const { return length_; }
void Trace(Visitor* visitor) const override {}
virtual void Truncate(int64_t length);
virtual void Write(int64_t position, const Blob& blob);
virtual void Cancel();
protected:
FileWriterBase();
void SetPosition(int64_t position) { position_ = position; }
void SetLength(int64_t length) { length_ = length; }
void SeekInternal(int64_t position);
// This calls DidSucceed() or DidFail() based on the value of |error_code|.
void DidFinish(base::File::Error error_code);
void DidSucceed();
void DidWrite(int64_t bytes, bool complete);
void DidFail(base::File::Error error_code);
// Derived classes must provide these methods to asynchronously perform
// the requested operation, and they must call the appropriate DidSomething
// method upon completion and as progress is made in the Write case.
virtual void DoTruncate(const KURL& path, int64_t offset) = 0;
virtual void DoWrite(const KURL& path, const Blob& blob, int64_t offset) = 0;
virtual void DoCancel() = 0;
// These are conditionally called by the Did* methods.
virtual void DidWriteImpl(int64_t bytes, bool complete) = 0;
virtual void DidFailImpl(base::File::Error error_code) = 0;
virtual void DidTruncateImpl() = 0;
private:
enum OperationType { kOperationNone, kOperationWrite, kOperationTruncate };
enum CancelState {
kCancelNotInProgress,
kCancelSent,
kCancelReceivedWriteResponse,
};
void FinishCancel();
int64_t position_;
int64_t length_;
KURL path_;
OperationType operation_;
CancelState cancel_state_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_FILESYSTEM_FILE_WRITER_BASE_H_
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