frodo-wii/Src/IEC.h
2009-01-13 18:46:42 +00:00

259 lines
8.0 KiB
C++

/*
* IEC.h - IEC bus routines, 1541 emulation (DOS level)
*
* Frodo (C) 1994-1997,2002-2005 Christian Bauer
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _IEC_H
#define _IEC_H
/*
* Definitions
*/
// Maximum length of file names
const int NAMEBUF_LENGTH = 256;
// C64 status codes
enum {
ST_OK = 0, // No error
ST_READ_TIMEOUT = 0x02, // Timeout on reading
ST_TIMEOUT = 0x03, // Timeout
ST_EOF = 0x40, // End of file
ST_NOTPRESENT = 0x80 // Device not present
};
// 1541 error codes
enum {
ERR_OK, // 00 OK
ERR_SCRATCHED, // 01 FILES SCRATCHED
ERR_UNIMPLEMENTED, // 03 UNIMPLEMENTED
ERR_READ20, // 20 READ ERROR (block header not found)
ERR_READ21, // 21 READ ERROR (no sync character)
ERR_READ22, // 22 READ ERROR (data block not present)
ERR_READ23, // 23 READ ERROR (checksum error in data block)
ERR_READ24, // 24 READ ERROR (byte decoding error)
ERR_WRITE25, // 25 WRITE ERROR (write-verify error)
ERR_WRITEPROTECT, // 26 WRITE PROTECT ON
ERR_READ27, // 27 READ ERROR (checksum error in header)
ERR_WRITE28, // 28 WRITE ERROR (long data block)
ERR_DISKID, // 29 DISK ID MISMATCH
ERR_SYNTAX30, // 30 SYNTAX ERROR (general syntax)
ERR_SYNTAX31, // 31 SYNTAX ERROR (invalid command)
ERR_SYNTAX32, // 32 SYNTAX ERROR (command too long)
ERR_SYNTAX33, // 33 SYNTAX ERROR (wildcards on writing)
ERR_SYNTAX34, // 34 SYNTAX ERROR (missing file name)
ERR_WRITEFILEOPEN, // 60 WRITE FILE OPEN
ERR_FILENOTOPEN, // 61 FILE NOT OPEN
ERR_FILENOTFOUND, // 62 FILE NOT FOUND
ERR_FILEEXISTS, // 63 FILE EXISTS
ERR_FILETYPE, // 64 FILE TYPE MISMATCH
ERR_NOBLOCK, // 65 NO BLOCK
ERR_ILLEGALTS, // 66 ILLEGAL TRACK OR SECTOR
ERR_NOCHANNEL, // 70 NO CHANNEL
ERR_DIRERROR, // 71 DIR ERROR
ERR_DISKFULL, // 72 DISK FULL
ERR_STARTUP, // 73 Power-up message
ERR_NOTREADY // 74 DRIVE NOT READY
};
// Mountable file types
enum {
FILE_IMAGE, // Disk image, handled by ImageDrive
FILE_ARCH // Archive file, handled by ArchDrive
};
// 1541 file types
enum {
FTYPE_DEL, // Deleted
FTYPE_SEQ, // Sequential
FTYPE_PRG, // Program
FTYPE_USR, // User
FTYPE_REL, // Relative
FTYPE_UNKNOWN
};
static const char ftype_char[9] = "DSPUL ";
// 1541 file access modes
enum {
FMODE_READ, // Read
FMODE_WRITE, // Write
FMODE_APPEND, // Append
FMODE_M // Read open file
};
// Drive LED states
enum {
DRVLED_OFF, // Inactive, LED off
DRVLED_ON, // Active, LED on
DRVLED_ERROR // Error, blink LED
};
// Information about file in disk image/archive file
struct c64_dir_entry {
c64_dir_entry(const uint8 *n, int t, bool o, bool p, size_t s, off_t ofs = 0, uint8 sal = 0, uint8 sah = 0)
: type(t), is_open(o), is_protected(p), size(s), offset(ofs), sa_lo(sal), sa_hi(sah)
{
strncpy((char *)name, (const char *)n, 17);
name[16] = 0;
}
// Basic information
uint8 name[17]; // File name (C64 charset, null-terminated)
int type; // File type (see defines above)
bool is_open; // Flag: file open
bool is_protected; // Flag: file protected
size_t size; // File size (may be approximated)
// Special information
off_t offset; // Offset of file in archive file
uint8 sa_lo, sa_hi; // C64 start address
};
class Drive;
class C64Display;
class Prefs;
// Class for complete IEC bus system with drives 8..11
class IEC {
public:
IEC(C64Display *display);
~IEC();
void Reset(void);
void NewPrefs(Prefs *prefs);
void UpdateLEDs(void);
uint8 Out(uint8 byte, bool eoi);
uint8 OutATN(uint8 byte);
uint8 OutSec(uint8 byte);
uint8 In(uint8 &byte);
void SetATN(void);
void RelATN(void);
void Turnaround(void);
void Release(void);
private:
Drive *create_drive(const char *path);
uint8 listen(int device);
uint8 talk(int device);
uint8 unlisten(void);
uint8 untalk(void);
uint8 sec_listen(void);
uint8 sec_talk(void);
uint8 open_out(uint8 byte, bool eoi);
uint8 data_out(uint8 byte, bool eoi);
uint8 data_in(uint8 &byte);
C64Display *the_display; // Pointer to display object (for drive LEDs)
uint8 name_buf[NAMEBUF_LENGTH]; // Buffer for file names and command strings
uint8 *name_ptr; // Pointer for reception of file name
int name_len; // Received length of file name
Drive *drive[4]; // 4 drives (8..11)
Drive *listener; // Pointer to active listener
Drive *talker; // Pointer to active talker
bool listener_active; // Listener selected, listener_data is valid
bool talker_active; // Talker selected, talker_data is valid
bool listening; // Last ATN was listen (to decide between sec_listen/sec_talk)
uint8 received_cmd; // Received command code ($x0)
uint8 sec_addr; // Received secondary address ($0x)
};
// Abstract superclass for individual drives
class Drive {
public:
Drive(IEC *iec);
virtual ~Drive() {}
virtual uint8 Open(int channel, const uint8 *name, int name_len)=0;
virtual uint8 Close(int channel)=0;
virtual uint8 Read(int channel, uint8 &byte)=0;
virtual uint8 Write(int channel, uint8 byte, bool eoi)=0;
virtual void Reset(void)=0;
int LED; // Drive LED state
bool Ready; // Drive is ready for operation
protected:
void set_error(int error, int track = 0, int sector = 0);
void parse_file_name(const uint8 *src, int src_len, uint8 *dest, int &dest_len, int &mode, int &type, int &rec_len, bool convert_charset = false);
void execute_cmd(const uint8 *cmd, int cmd_len);
virtual void block_read_cmd(int channel, int track, int sector, bool user_cmd = false);
virtual void block_write_cmd(int channel, int track, int sector, bool user_cmd = false);
virtual void block_execute_cmd(int channel, int track, int sector);
virtual void block_allocate_cmd(int track, int sector);
virtual void block_free_cmd(int track, int sector);
virtual void buffer_pointer_cmd(int channel, int pos);
virtual void mem_read_cmd(uint16 adr, uint8 len);
virtual void mem_write_cmd(uint16 adr, uint8 len, uint8 *p);
virtual void mem_execute_cmd(uint16 adr);
virtual void copy_cmd(const uint8 *new_file, int new_file_len, const uint8 *old_files, int old_files_len);
virtual void rename_cmd(const uint8 *new_file, int new_file_len, const uint8 *old_file, int old_file_len);
virtual void scratch_cmd(const uint8 *files, int files_len);
virtual void position_cmd(const uint8 *cmd, int cmd_len);
virtual void initialize_cmd(void);
virtual void new_cmd(const uint8 *name, int name_len, const uint8 *comma);
virtual void validate_cmd(void);
void unsupp_cmd(void);
char error_buf[256]; // Buffer with current error message
char *error_ptr; // Pointer within error message
int error_len; // Remaining length of error message
int current_error; // Number of current error
uint8 cmd_buf[64]; // Buffer for incoming command strings
int cmd_len; // Length of received command
private:
IEC *the_iec; // Pointer to IEC object
};
/*
* Functions
*/
// Convert ASCII character to PETSCII character
extern uint8 ascii2petscii(char c);
// Convert ASCII string to PETSCII string
extern void ascii2petscii(uint8 *dest, const char *src, int max);
// Convert PETSCII character to ASCII character
extern char petscii2ascii(uint8 c);
// Convert PETSCII string to ASCII string
extern void petscii2ascii(char *dest, const uint8 *src, int max);
// Check whether file is a mountable disk image or archive file, return type
extern bool IsMountableFile(const char *path, int &type);
// Read directory of mountable disk image or archive file into c64_dir_entry vector
extern bool ReadDirectory(const char *path, int type, vector<c64_dir_entry> &vec);
#endif