You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
249 lines
6.7 KiB
249 lines
6.7 KiB
// KDat - a tar-based DAT archiver
|
|
// Copyright (C) 1998-2000 Sean Vyain, svyain@mail.tds.net
|
|
// Copyright (C) 2001-2002 Lawrence Widman, kdat@cardiothink.com
|
|
//
|
|
// 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 2 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, write to the Free Software
|
|
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
#ifndef _TapeDrive_h_
|
|
#define _TapeDrive_h_
|
|
|
|
#include <tqobject.h>
|
|
|
|
class Tape;
|
|
|
|
/**
|
|
* @short An OO interface to the tape drive.
|
|
*/
|
|
class TapeDrive : public TQObject {
|
|
TQ_OBJECT
|
|
|
|
int _fd;
|
|
bool _readOnly;
|
|
Tape* _tape;
|
|
char* _writeBuf;
|
|
char* _readBuf;
|
|
int _writeBufIdx;
|
|
int _readBufIdx;
|
|
|
|
static TapeDrive* _instance;
|
|
|
|
TapeDrive();
|
|
public:
|
|
/**
|
|
* Destroy the tape drive (figuratively speaking, of course).
|
|
*/
|
|
~TapeDrive();
|
|
|
|
/**
|
|
* Get a reference to the single instance of the tape drive object.
|
|
*
|
|
* @return A pointer to the tape drive object.
|
|
*/
|
|
static TapeDrive* instance();
|
|
|
|
/**
|
|
* Close the tape device. If data was written to the tape drive, then this
|
|
* will also cause a single end-of-file marker to be written out. This is
|
|
* the preferred way to write an end-of-file marker to the tape.
|
|
*/
|
|
void close();
|
|
|
|
/**
|
|
* Physically eject the tape from the drive. Some tape drives do not
|
|
* support this operation well.
|
|
*/
|
|
void eject();
|
|
|
|
/**
|
|
* If there is unwritten data in the buffer, it will be flushed out. This
|
|
* method is called when necessary by the other tape drive methods.
|
|
*/
|
|
void flush();
|
|
|
|
/**
|
|
* Get the current tape file number. The first tape file is number 0.
|
|
*
|
|
* @return >= 0 on success, -1 on failure.
|
|
*/
|
|
int getFile();
|
|
|
|
/**
|
|
* Get the current tape block number within the current file. The first
|
|
* tape block number within a file is 0.
|
|
*
|
|
* @return >= 0 on success, -1 on failure.
|
|
*/
|
|
int getBlock();
|
|
|
|
/**
|
|
* Determine whether the tape can be written to.
|
|
*
|
|
* @return TRUE if the tape cannot be written to, otherwise FALSE.
|
|
*/
|
|
bool isReadOnly();
|
|
|
|
/**
|
|
* Determine whether there is a tape in the drive.
|
|
*
|
|
* @return TRUE if there is a tape, otherwise FALSE.
|
|
*/
|
|
bool isTapePresent();
|
|
|
|
/**
|
|
* Load the tape into the drive.
|
|
*
|
|
* @return TRUE on success, otherwise FALSE.
|
|
*/
|
|
bool load();
|
|
|
|
/**
|
|
* Lock the tape in the drive, so that it cannot be ejected manually by the
|
|
* user. Not all tape drives support this operation.
|
|
*
|
|
* @return TRUE on success, otherwise FALSE.
|
|
*/
|
|
bool lock();
|
|
|
|
/**
|
|
* Skip over one or more end-of-file markers on the tape. The tape is
|
|
* positioned just after the last skipped end-of-file marker.
|
|
*
|
|
* @param count The number of end-of-file markers to skip over.
|
|
*
|
|
* @return TRUE on success, otherwise FALSE.
|
|
*/
|
|
bool nextFile( int count );
|
|
|
|
/**
|
|
* Skip over one or more tape blocks within the current tape file.
|
|
*
|
|
* @param count The number of tape blocks to skip over.
|
|
*
|
|
* @return TRUE on success, otherwise FALSE.
|
|
*/
|
|
bool nextRecord( int count );
|
|
|
|
/**
|
|
* Open the tape device for reading and writing. If this fails, try
|
|
* opening the tape device for reading only. Check isReadOnly() to see
|
|
* if the tape device was opened for reading and writing.
|
|
*
|
|
* @return TRUE if the tape device was opened for reading and/or writing,
|
|
* otherwise FALSE.
|
|
*/
|
|
void open();
|
|
|
|
/**
|
|
* Determine wether the tape is positioned just after an end-of-file
|
|
* marker.
|
|
*
|
|
* @return TRUE if the tape is positioned after an end-of-file marker,
|
|
* otherwise FALSE.
|
|
*/
|
|
bool pastEOF();
|
|
|
|
/**
|
|
* Backspace over one or more end-of-file markers. The tape is positioned
|
|
* just before the last end-of-file marker.
|
|
*
|
|
* @param count The number of end-of-file markers to backspace over.
|
|
*
|
|
* @return TRUE on success, otherwise FALSE.
|
|
*/
|
|
bool prevFile( int count );
|
|
|
|
/**
|
|
* Backspace over one or more tape blocks.
|
|
*
|
|
* @param count The number of tape block to backspace over.
|
|
*
|
|
* @return TRUE on success, otherwise FALSE.
|
|
*/
|
|
bool prevRecord( int count );
|
|
|
|
/**
|
|
* Read data from the tape.
|
|
*
|
|
* @param buf The buffer to read into.
|
|
* @param len The number of bytes to read.
|
|
*
|
|
* @return The actual number of bytes read, or -1 on failure.
|
|
*/
|
|
int read( char* buf, int len );
|
|
|
|
/**
|
|
* Read the KDat tape header (if there is one), and get the index
|
|
* associated with the tape.
|
|
*
|
|
* @return A pointer to the tape index, or NULL if the tape does not have
|
|
* a KDat header.
|
|
*/
|
|
Tape* readHeader();
|
|
|
|
/**
|
|
* Rewind the tape.
|
|
*
|
|
* @return TRUE on success, otherwise FALSE.
|
|
*/
|
|
bool rewind();
|
|
|
|
/**
|
|
* Move the tape to the given tar block within the given tape file. This
|
|
* method will intelligently move the tape to the desired position.
|
|
*
|
|
* @param file The tape file number.
|
|
* @param tarBlock The desired tar block (NOT tape block).
|
|
*
|
|
* @return TRUE on success, otherwise FALSE.
|
|
*/
|
|
bool seek( int file, int tarBlock );
|
|
|
|
/**
|
|
* Set the hardware tape block size.
|
|
*
|
|
* @param blockSize The new tape block size in bytes.
|
|
*
|
|
* @return TRUE on success, otherwise FALSE.
|
|
*/
|
|
bool setBlockSize( int blockSize );
|
|
|
|
/**
|
|
* Unlock the tape in the drive, so that it can be ejected manually by the
|
|
* user. Not all tape drives support this operation.
|
|
*
|
|
* @return TRUE on success, otherwise FALSE.
|
|
*/
|
|
bool unlock();
|
|
|
|
/**
|
|
* Write data to the tape.
|
|
*
|
|
* @param buf The buffer to write from.
|
|
* @param len The number of bytes to write.
|
|
*
|
|
* @return The actual number of bytes written, or -1 on failure.
|
|
*/
|
|
int write( const char* buf, int len );
|
|
signals:
|
|
/**
|
|
* This signal is emitted for one-line, informational messages.
|
|
*
|
|
* @param msg The informational message.
|
|
*/
|
|
void sigStatus( const TQString & msg );
|
|
};
|
|
|
|
#endif
|