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emud64.h
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emud64.h
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////////////////////////////////////////////////////////////////////////////////
//
// emud64.h - Class EmuD64
// 1541 Disk Image Driver - access files, directory from disk image
//
// MIT License
//
// Copyright (c) 2024 by David R. Van Wagner
// davevw.com
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
////////////////////////////////////////////////////////////////////////////////
#pragma once
class EmuD64
{
private:
unsigned char* bytes;
char* filename_d64;
bool* track_dirty;
public:
EmuD64(const char* filename_d64); // tested
~EmuD64(); // TODO: TEST
class DirStruct;
void InitializeData(unsigned char* disk_name, unsigned char* id); // TODO: TEST
int GetSectorOffset(int track, int sector); // tested
void WalkDirectory(bool (*dirFn)(EmuD64* d64, DirStruct* dir, int n, bool last, void*& context), void*& context); // tested
int GetDirectoryCount(); // tested
int GetDeletedCount();
DirStruct* DirectoryEntry(int i); // tested
void DiskBAMField(int field_offset, int size, unsigned char* field); // tested
void DiskBAMPrintable(int field_offset, int size, char* field); // tested
void DiskName(char* disk_name, int size); // tested
void DiskId(char* disk_id, int size); // tested
void DiskDosType(char* disk_dos_type, int size); // tested
int BlocksFree(); // tested
void ReadFileByIndex(int i, unsigned char* data, int& length); // tested
void ReadFileByName(unsigned char* filename, unsigned char* bytes, int &length); // TODO: TEST
void StoreFileByName(char* filename, unsigned char* data, int data_len); // TODO: TEST
const char* GetDirectoryFormatted(); // tested
bool GetDirectoryProgram(unsigned char* data, int& data_size); // TODO: TEST
private:
struct BlockStruct
{
int track;
int sector;
};
void WriteBlock(BlockStruct block, BlockStruct next_block, unsigned char* data, int data_len, int data_offset);
BlockStruct AllocBlock(bool directory);
void StoreFileByStruct(DirStruct* dir, unsigned char* data, int data_len);
bool FindOrAllocDirectoryEntry(DirStruct* dir, int& track, int& sector, int& entry);
void LoadFromFilenameOrCreate();
void FlushDisk();
public:
static const int sectors_per_disk =
(
21 + 21 + 21 + 21 + 21 + 21 + 21 + 21 + 21 + 21 + 21 + 21 + 21 + 21 + 21 + 21 + 21 +
19 + 19 + 19 + 19 + 19 + 19 + 19 +
18 + 18 + 18 + 18 + 18 + 18 +
17 + 17 + 17 + 17 + 17
);
static const int bytes_per_disk = 256 * sectors_per_disk;
static const int dir_track = 18;
static const int dir_sector = 1;
static const int dir_entry_size = 32;
static const int n_tracks = 35;
static const int bytes_per_sector = 256;
static const int dir_entries_per_sector = bytes_per_sector / dir_entry_size;
static const int dir_entries_max = (19/*sectors_per_track[dir_track]*/ - 1) * dir_entries_per_sector;
static const int bam_track = dir_track;
static const int bam_sector = 0;
static const int disk_name_offset = 0x90;
static const int disk_name_size = 16;
static const int disk_id_offset = 0xA2;
static const int disk_id_size = 2;
static const int disk_dos_type_offset = 0xA5;
static const int disk_dos_type_size = 2;
class DirStruct
{
public:
static const int dir_name_size = 16;
const int dir_unused_size = 6;
enum FileType { DEL = 0, SEQ = 1, PRG = 2, USR = 3, REL = 4 };
int next_track;
int next_sector;
int file_type; // lower 4 bits, 4 unused, 5 for @SAVE, 6 for > Locked, 7 Closed otherwise *
int file_track;
int file_sector;
unsigned char filename[16]; // 16 character, PETSCII, $A0 right padded
int rel_track;
int rel_sector;
int rel_length;
unsigned char unused[6]; // 6 bytes unused except GEOS disks
unsigned short n_sectors; // 16-bit
DirStruct(); // tested
void Read(EmuD64* d64, int track, int sector, int n); // tested
void ReadData(EmuD64* d64, unsigned char* data, int offset); // tested
int Store(EmuD64* d64, int dir_track, int dir_sector, int dir_sector_entry);
static char PrintableChar(unsigned char c); // tested
void getName(unsigned char* name, int size);
const char* FileTypeString(); // tested
const char* toString(); // tested
}; // class DirStruct
}; // class EmuD64