--- /dev/null
+//
+// Apple 2 floppy disk support
+//
+
+#ifndef __FLOPPY_H__
+#define __FLOPPY_H__
+
+// MAX_PATH isn't defined in stdlib.h on *nix, so we do it here...
+#ifdef __GCCUNIX__
+#include <limits.h>
+#define MAX_PATH _POSIX_PATH_MAX
+#else
+#include <stdlib.h> // for MAX_PATH on MinGW/Darwin
+// Kludge for Win64
+#ifndef MAX_PATH
+#define MAX_PATH _MAX_PATH
+#endif
+#endif
+
+#include <stdint.h>
+#include <stdio.h>
+
+enum { DT_EMPTY = 0, DT_WOZ, DT_DOS33, DT_DOS33_HDR, DT_PRODOS, DT_NYBBLE,
+ DFT_UNKNOWN };
+enum { DLS_OFF, DLS_READ, DLS_WRITE };
+
+// N.B.: All 32/16-bit values are stored in little endian. Which means, to
+// read/write them safely, we need to use translators as this code may or
+// may not be compiled on an architecture that supports little endian
+// natively.
+
+struct WOZTrack
+{
+ uint8_t bits[6646];
+ uint16_t byteCount;
+ uint16_t bitCount;
+ uint16_t splicePoint;
+ uint8_t spliceNibble;
+ uint8_t spliceBitCount;
+ uint16_t reserved;
+};
+
+struct WOZMetadata
+{
+ uint8_t metaTag[4]; // "META"
+ uint32_t metaSize; // Size of the META chunk
+ uint8_t data[]; // Variable length array of metadata
+};
+
+struct WOZ
+{
+ // Header
+ uint8_t magic[8]; // "WOZ1" $FF $0A $0D $0A
+ uint32_t crc32; // CRC32 of the remaining data in the file
+
+ // INFO chunk
+ uint8_t infoTag[4]; // "INFO"
+ uint32_t infoSize; // Always 60 bytes long
+ uint8_t infoVersion; // Currently 1
+ uint8_t diskType; // 1 = 5 1/4", 2 = 3 1/2"
+ uint8_t writeProtected; // 1 = write protected disk
+ uint8_t synchronized; // 1 = cross-track sync was used during imaging
+ uint8_t cleaned; // 1 = fake bits removed from image
+ uint8_t creator[32]; // Software that made this image, padded with 0x20
+ uint8_t pad1[23]; // Padding to 60 bytes
+
+ // TMAP chunk
+ uint8_t tmapTag[4]; // "TMAP"
+ uint32_t tmapSize; // Always 160 bytes long
+ uint8_t tmap[160]; // Track map, with empty tracks set to $FF
+
+ // TRKS chunk
+ uint8_t trksTag[4]; // "TRKS"
+ uint32_t trksSize; // Varies, depending on # of tracks imaged
+ WOZTrack track[]; // Variable length array for the track data proper
+};
+
+struct WOZTrack2
+{
+ uint16_t startingBlock; // 512 byte block # where this track starts (relative to the start of the file)
+ uint16_t blockCount; // # of blocks in this track
+ uint32_t bitCount; // # of bits in this track
+};
+
+struct WOZ2
+{
+ // Header
+ uint8_t magic[8]; // "WOZ2" $FF $0A $0D $0A
+ uint32_t crc32; // CRC32 of the remaining data in the file
+
+ // INFO chunk
+ uint8_t infoTag[4]; // "INFO"
+ uint32_t infoSize; // Always 60 bytes long
+ uint8_t infoVersion; // Currently 1
+ uint8_t diskType; // 1 = 5 1/4", 2 = 3 1/2"
+ uint8_t writeProtected; // 1 = write protected disk
+ uint8_t synchronized; // 1 = cross-track sync was used during imaging
+ uint8_t cleaned; // 1 = fake bits removed from image
+ uint8_t creator[32]; // Software that made this image, padded with 0x20
+ uint8_t diskSides; // 5 1/4" disks always have 1 side (v2 from here on)
+ uint8_t bootSectorFmt; // 5 1/4" only (0=unknown, 1=16 sector, 2=13 sector, 3=both)
+ uint8_t optimalBitTmg; // In ticks, standard for 5 1/4" is 32 (4 µs)
+ uint16_t compatibleHW; // Bitfield showing hardware compatibility (1=][, 2=][+, 4=//e (unenh), 8=//c, 16=//e (enh), 32=IIgs, 64=//c+, 128=///, 256=///+)
+ uint16_t requiredRAM; // Minimum size in K, 0=unknown
+ uint16_t largestTrack; // Number of 512 byte blocks used by largest track
+ uint8_t pad1[14]; // Padding to 60 bytes
+
+ // TMAP chunk
+ uint8_t tmapTag[4]; // "TMAP"
+ uint32_t tmapSize; // Always 160 bytes long
+ uint8_t tmap[160]; // Track map, with empty tracks set to $FF
+
+ // TRKS chunk
+ uint8_t trksTag[4]; // "TRKS"
+ uint32_t trksSize; // Varies, depending on # of tracks imaged
+ WOZTrack2 track[160]; // Actual track info (corresponding to TMAP data)
+ uint8_t data[]; // Variable length array for the track data proper
+};
+
+class FloppyDrive
+{
+ public:
+ FloppyDrive();
+ ~FloppyDrive();
+
+ bool LoadImage(const char * filename, uint8_t driveNum = 0);
+ bool SaveImage(uint8_t driveNum = 0);
+ bool SaveImageAs(const char * filename, uint8_t driveNum = 0);
+ void CreateBlankImage(uint8_t driveNum = 0);
+ void SwapImages(void);
+ const char * ImageName(uint8_t driveNum = 0);
+ void EjectImage(uint8_t driveNum = 0);
+ bool IsEmpty(uint8_t driveNum = 0);
+ bool IsWriteProtected(uint8_t driveNum = 0);
+ void SetWriteProtect(bool, uint8_t driveNum = 0);
+ int DriveLightStatus(uint8_t driveNum = 0);
+ void SaveState(FILE *);
+ void LoadState(FILE *);
+ void InitWOZ(uint8_t driveNum = 0);
+ bool CheckWOZ(const uint8_t * wozData, uint32_t wozSize, uint8_t driveNum = 0);
+ bool SaveWOZ(uint8_t driveNum);
+
+ private:
+ uint32_t ReadLong(FILE *);
+ void WriteLong(FILE *, uint32_t);
+ void WriteLongLE(FILE *, uint32_t);
+ void WriteWordLE(FILE *, uint16_t);
+ void WriteZeroes(FILE *, uint32_t);
+
+ // I/O functions ($C0Ex accesses)
+
+ public:
+ void ControlStepper(uint8_t addr);
+ void ControlMotor(uint8_t addr);
+ void DriveEnable(uint8_t addr);
+ void SetShiftLoadSwitch(uint8_t state);
+ void SetReadWriteSwitch(uint8_t state);
+ uint8_t DataRegister(void);
+ void DataRegister(uint8_t);
+ void RunSequencer(uint32_t);
+
+ protected:
+ void DetectImageType(const char * filename, uint8_t driveNum);
+ void WriteBits(uint8_t * dest, uint8_t * src, uint16_t bits, uint16_t * start);
+ void WOZifyImage(uint8_t driveNum);
+
+ private:
+ char imageName[2][MAX_PATH];
+ uint8_t * disk[2];
+ uint32_t diskSize[2];
+ uint8_t diskType[2];
+ bool imageDirty[2];
+ uint8_t motorOn;
+ uint8_t activeDrive;
+ uint8_t ioMode;
+ uint8_t dataRegister;
+ uint8_t phase[2];
+ uint8_t headPos[2];
+ bool ioHappened;
+
+ uint32_t currentPos[2];
+ WOZ * woz[2];
+
+ uint8_t cpuDataBus;
+ uint8_t slSwitch; // Shift/Load soft switch
+ uint8_t rwSwitch; // Read/Write soft switch
+ uint8_t readPulse; // Disk read head "pulse" signal
+ uint8_t pulseClock; // Disk read head bitstream "pulse clock"
+ uint8_t sequencerState;
+ uint32_t driveOffTimeout;
+ uint8_t zeroBitCount;
+ uint16_t trackLength[2];
+
+ // And here are some private class variables (to reduce function
+ // redundancy):
+ static uint8_t doSector[16];
+ static uint8_t poSector[16];
+ static uint8_t wozHeader[9];
+ static uint8_t wozHeader2[9];
+ static uint8_t standardTMAP[141];
+ static uint8_t sequencerROM[256];
+ static uint8_t bitMask[8];
+ static char nameBuf[MAX_PATH];
+};
+
+void InstallFloppy(uint8_t slot);
+extern FloppyDrive floppyDrive[];
+
+#endif // __FLOPPY_H__
+
projects / apple2 / blobdiff