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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 FileStream_h
#define FileStream_h
#if ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
#include "FileSystem.h"
#include <wtf/Forward.h>
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>
namespace WebCore {
class KURL;
// All methods are synchronous.
class FileStream : public RefCounted<FileStream> {
public:
static PassRefPtr<FileStream> create()
{
return adoptRef(new FileStream());
}
~FileStream();
// FIXME: To be removed when we switch to using BlobData.
void start();
// Aborts the operation.
void stop();
// Gets the size of a file. Also validates if the file has been changed or not if the expected modification time is provided, i.e. non-zero.
// Returns total number of bytes if successful. -1 otherwise.
long long getSize(const String& path, double expectedModificationTime);
// Opens a file for reading. The reading starts at the specified offset and lasts till the specified length.
// Returns true on success. False otherwise.
bool openForRead(const String& path, long long offset, long long length);
// Opens a file for writing.
// Returns true on success. False otherwise.
bool openForWrite(const String& path);
// Closes the file.
void close();
// Reads a file into the provided data buffer.
// Returns number of bytes being read on success. -1 otherwise.
// If 0 is returned, it means that the reading is completed.
int read(char* buffer, int length);
// Writes a blob to the file.
// Returns number of bytes being written on success. -1 otherwise.
int write(const KURL& blobURL, long long position, int length);
// Truncates the file to the specified position.
// Returns true on success. False otherwise.
bool truncate(long long position);
private:
FileStream();
PlatformFileHandle m_handle;
long long m_bytesProcessed;
long long m_totalBytesToRead;
};
} // namespace WebCore
#endif // ENABLE(BLOB) || ENABLE(FILE_SYSTEM)
#endif // FileStream_h
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