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