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/*
* Copyright (C) 2010 Regents of the University of Michigan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __FILETYPE_H__
#define __FILETYPE_H__
#include <stdint.h>
class FileType
{
public:
FileType();
virtual ~FileType();
virtual bool operator == (void * rhs) = 0;
virtual bool operator != (void * rhs) = 0;
// Close the file.
virtual int close() = 0;
// Reset to the beginning of the file.
virtual void rewind() = 0;
// Check to see if we have reached the EOF.
virtual int eof() = 0;
// Check to see if the file is open.
virtual bool isOpen() = 0;
// Write to the file.
virtual unsigned int write(const void * buffer, unsigned int size) = 0;
// Read into a buffer from the file.
virtual int read(void * buffer, unsigned int size) = 0;
// Get current position in the file.
// -1 return value indicates an error.
virtual int64_t tell() = 0;
// Seek to the specified offset from the origin.
// origin can be any of the following:
// Note: not all are valid for all filetypes.
// SEEK_SET - Beginning of file
// SEEK_CUR - Current position of the file pointer
// SEEK_END - End of file
// Returns true on successful seek and false on a failed seek.
virtual bool seek(int64_t offset, int origin) = 0;
// Set by the InputFile to inform this class if buffering
// is used. Maybe used by child clases (bgzf) to disable
// tell. NOTE: this class does no buffering, the
// buffering is handled by the calling class.
void setBuffered(bool buffered);
//
// When caller catches an exception, it may call this method.
// It is implemented only in BgzfFileTypeRecovery.
//
virtual bool attemptRecoverySync(bool (*checkSignature)(void *data) , int length);
protected:
// Set by the InputFile to inform this class if buffering
// is used. Maybe used by child clases (bgzf) to disable
// tell.
bool myUsingBuffer;
};
#endif
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