mirror of
https://github.com/cmosher01/Epple-II.git
synced 2024-06-09 23:29:39 +00:00
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
/*
|
|
epple2
|
|
|
|
Copyright © 2018, Christopher Alan Mosher, Shelton, CT, USA. <cmosher01@gmail.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 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 WOZFILE_H
|
|
#define WOZFILE_H
|
|
|
|
#include <string>
|
|
#include <cstdint>
|
|
|
|
/**
|
|
* @brief WOZ file (floppy disk image)
|
|
* Represents a floppy disk. We only handle 5.25" disks.
|
|
* The disk has 141 quarter-track possible positions, but
|
|
* typically will have 35 tracks.
|
|
* The floppy disk "knows" it's rotational position.
|
|
*
|
|
* Note, the floppy has no notion of the current track;
|
|
* rather, that information is known by the stepper motor and arm.
|
|
*/
|
|
class WozFile {
|
|
std::string fileName;
|
|
std::string filePath;
|
|
bool loaded;
|
|
bool modified;
|
|
|
|
// represents (negation of) write-protect tab
|
|
// We consider the disk to be write-protected if the user does
|
|
// not have write access to the file OR the WOZ file INFO chuck
|
|
// indicates that the floppy was write-protected.
|
|
bool writable;
|
|
|
|
std::uint8_t tmap[141]; // quarter-tracks from T0 through T35, values are indexes into trks
|
|
std::uint8_t c_trks; // count of actual tracks:
|
|
std::uint8_t trks[141][6646]; // 141 is theoretical max; will always be less
|
|
std::uint16_t trk_bits[141]; // count of bits in each track
|
|
|
|
// bit and byt together represent the rotational position
|
|
// of the floppy disk.
|
|
// bit is a mask indicating current bit within current byte (byt).
|
|
// WOZ file bits are packed into bytes starting at bit 7
|
|
// through bit 0 of the first byte, then bits 7-0 of the
|
|
// next byte, etc., from bits 0 through trk_bits-1
|
|
std::uint8_t bit;
|
|
std::uint16_t byt;
|
|
|
|
// We need to store which track were on, only so we can detect
|
|
// a change in tracks, and if so adjust our current byt/bit
|
|
// to be proportional with the new track. This is discussed
|
|
// in the WOZ file spec.
|
|
std::uint8_t lastQuarterTrack;
|
|
|
|
void checkForWriteProtection();
|
|
|
|
public:
|
|
WozFile();
|
|
~WozFile();
|
|
|
|
bool load(const std::string& filePath);
|
|
|
|
std::string getFileName() {
|
|
return this->fileName;
|
|
}
|
|
|
|
bool isLoaded() {
|
|
return this->loaded;
|
|
}
|
|
|
|
void save();
|
|
void unload();
|
|
bool isWriteProtected() {
|
|
return !this->writable;
|
|
}
|
|
|
|
bool isModified() {
|
|
return this->modified;
|
|
}
|
|
|
|
void rotateOneBit(std::uint8_t currentQuarterTrack);
|
|
bool getBit(std::uint8_t currentQuarterTrack);
|
|
void setBit(std::uint8_t currentQuarterTrack, bool on);
|
|
};
|
|
|
|
#endif // WOZFILE_H
|