1 |
/* |
2 |
* 1541d64.cpp - 1541 emulation in .d64 file |
3 |
* |
4 |
* Frodo (C) 1994-1997,2002-2003 Christian Bauer |
5 |
* |
6 |
* This program is free software; you can redistribute it and/or modify |
7 |
* it under the terms of the GNU General Public License as published by |
8 |
* the Free Software Foundation; either version 2 of the License, or |
9 |
* (at your option) any later version. |
10 |
* |
11 |
* This program is distributed in the hope that it will be useful, |
12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 |
* GNU General Public License for more details. |
15 |
* |
16 |
* You should have received a copy of the GNU General Public License |
17 |
* along with this program; if not, write to the Free Software |
18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 |
*/ |
20 |
|
21 |
/* |
22 |
* Incompatibilities: |
23 |
* ------------------ |
24 |
* |
25 |
* - Only read accesses possible |
26 |
* - Not all commands implemented |
27 |
* - The .d64 error info is read, but unused |
28 |
*/ |
29 |
|
30 |
#include "sysdeps.h" |
31 |
|
32 |
#include "1541d64.h" |
33 |
#include "IEC.h" |
34 |
#include "Prefs.h" |
35 |
#include "C64.h" |
36 |
|
37 |
|
38 |
// Channel modes (IRC users listen up :-) |
39 |
enum { |
40 |
CHMOD_FREE, // Channel free |
41 |
CHMOD_COMMAND, // Command/error channel |
42 |
CHMOD_DIRECTORY, // Reading directory |
43 |
CHMOD_FILE, // Sequential file open |
44 |
CHMOD_DIRECT // Direct buffer access ('#') |
45 |
}; |
46 |
|
47 |
// Access modes |
48 |
enum { |
49 |
FMODE_READ, FMODE_WRITE, FMODE_APPEND |
50 |
}; |
51 |
|
52 |
// File types |
53 |
enum { |
54 |
FTYPE_PRG, FTYPE_SEQ, FTYPE_USR, FTYPE_REL |
55 |
}; |
56 |
|
57 |
// Number of tracks/sectors |
58 |
const int NUM_TRACKS = 35; |
59 |
const int NUM_SECTORS = 683; |
60 |
|
61 |
// Prototypes |
62 |
static bool match(uint8 *p, uint8 *n); |
63 |
|
64 |
|
65 |
/* |
66 |
* Constructor: Prepare emulation, open .d64 file |
67 |
*/ |
68 |
|
69 |
D64Drive::D64Drive(IEC *iec, char *filepath) : Drive(iec) |
70 |
{ |
71 |
the_file = NULL; |
72 |
ram = NULL; |
73 |
|
74 |
Ready = false; |
75 |
strcpy(orig_d64_name, filepath); |
76 |
for (int i=0; i<=14; i++) { |
77 |
chan_mode[i] = CHMOD_FREE; |
78 |
chan_buf[i] = NULL; |
79 |
} |
80 |
chan_mode[15] = CHMOD_COMMAND; |
81 |
|
82 |
// Open .d64 file |
83 |
open_close_d64_file(filepath); |
84 |
if (the_file != NULL) { |
85 |
|
86 |
// Allocate 1541 RAM |
87 |
ram = new uint8[DRIVE_RAM_SIZE]; |
88 |
bam = (BAM *)(ram + 0x700); |
89 |
|
90 |
Reset(); |
91 |
Ready = true; |
92 |
} |
93 |
} |
94 |
|
95 |
|
96 |
/* |
97 |
* Destructor |
98 |
*/ |
99 |
|
100 |
D64Drive::~D64Drive() |
101 |
{ |
102 |
// Close .d64 file |
103 |
open_close_d64_file(""); |
104 |
|
105 |
delete[] ram; |
106 |
Ready = false; |
107 |
} |
108 |
|
109 |
|
110 |
/* |
111 |
* Open/close the .d64 file |
112 |
*/ |
113 |
|
114 |
void D64Drive::open_close_d64_file(char *d64name) |
115 |
{ |
116 |
long size; |
117 |
uint8 magic[4]; |
118 |
|
119 |
// Close old .d64, if open |
120 |
if (the_file != NULL) { |
121 |
close_all_channels(); |
122 |
fclose(the_file); |
123 |
the_file = NULL; |
124 |
} |
125 |
|
126 |
// Open new .d64 file |
127 |
if (d64name[0]) { |
128 |
if ((the_file = fopen(d64name, "rb")) != NULL) { |
129 |
|
130 |
// Check length |
131 |
fseek(the_file, 0, SEEK_END); |
132 |
if ((size = ftell(the_file)) < NUM_SECTORS * 256) { |
133 |
fclose(the_file); |
134 |
the_file = NULL; |
135 |
return; |
136 |
} |
137 |
|
138 |
// x64 image? |
139 |
rewind(the_file); |
140 |
fread(&magic, 4, 1, the_file); |
141 |
if (magic[0] == 0x43 && magic[1] == 0x15 && magic[2] == 0x41 && magic[3] == 0x64) |
142 |
image_header = 64; |
143 |
else |
144 |
image_header = 0; |
145 |
|
146 |
// Preset error info (all sectors no error) |
147 |
memset(error_info, 1, NUM_SECTORS); |
148 |
|
149 |
// Load sector error info from .d64 file, if present |
150 |
if (!image_header && size == NUM_SECTORS * 257) { |
151 |
fseek(the_file, NUM_SECTORS * 256, SEEK_SET); |
152 |
fread(&error_info, NUM_SECTORS, 1, the_file); |
153 |
} |
154 |
} |
155 |
} |
156 |
} |
157 |
|
158 |
|
159 |
/* |
160 |
* Open channel |
161 |
*/ |
162 |
|
163 |
uint8 D64Drive::Open(int channel, char *filename) |
164 |
{ |
165 |
set_error(ERR_OK); |
166 |
|
167 |
// Channel 15: execute file name as command |
168 |
if (channel == 15) { |
169 |
execute_command(filename); |
170 |
return ST_OK; |
171 |
} |
172 |
|
173 |
if (chan_mode[channel] != CHMOD_FREE) { |
174 |
set_error(ERR_NOCHANNEL); |
175 |
return ST_OK; |
176 |
} |
177 |
|
178 |
if (filename[0] == '$') |
179 |
if (channel) |
180 |
return open_file_ts(channel, 18, 0); |
181 |
else |
182 |
return open_directory(filename+1); |
183 |
|
184 |
if (filename[0] == '#') |
185 |
return open_direct(channel, filename); |
186 |
|
187 |
return open_file(channel, filename); |
188 |
} |
189 |
|
190 |
|
191 |
/* |
192 |
* Open file |
193 |
*/ |
194 |
|
195 |
uint8 D64Drive::open_file(int channel, char *filename) |
196 |
{ |
197 |
char plainname[256]; |
198 |
int filemode = FMODE_READ; |
199 |
int filetype = FTYPE_PRG; |
200 |
int track, sector; |
201 |
|
202 |
convert_filename(filename, plainname, &filemode, &filetype); |
203 |
|
204 |
// Channel 0 is READ PRG, channel 1 is WRITE PRG |
205 |
if (!channel) { |
206 |
filemode = FMODE_READ; |
207 |
filetype = FTYPE_PRG; |
208 |
} |
209 |
if (channel == 1) { |
210 |
filemode = FMODE_WRITE; |
211 |
filetype = FTYPE_PRG; |
212 |
} |
213 |
|
214 |
// Allow only read accesses |
215 |
if (filemode != FMODE_READ) { |
216 |
set_error(ERR_WRITEPROTECT); |
217 |
return ST_OK; |
218 |
} |
219 |
|
220 |
// Find file in directory and open it |
221 |
if (find_file(plainname, &track, §or)) |
222 |
return open_file_ts(channel, track, sector); |
223 |
else |
224 |
set_error(ERR_FILENOTFOUND); |
225 |
|
226 |
return ST_OK; |
227 |
} |
228 |
|
229 |
|
230 |
/* |
231 |
* Analyze file name, get access mode and type |
232 |
*/ |
233 |
|
234 |
void D64Drive::convert_filename(char *srcname, char *destname, int *filemode, int *filetype) |
235 |
{ |
236 |
char *p; |
237 |
|
238 |
// Search for ':', p points to first character after ':' |
239 |
if ((p = strchr(srcname, ':')) != NULL) |
240 |
p++; |
241 |
else |
242 |
p = srcname; |
243 |
|
244 |
// Remaining string -> destname |
245 |
strncpy(destname, p, NAMEBUF_LENGTH); |
246 |
|
247 |
// Search for ',' |
248 |
p = destname; |
249 |
while (*p && (*p != ',')) p++; |
250 |
|
251 |
// Look for mode parameters seperated by ',' |
252 |
p = destname; |
253 |
while ((p = strchr(p, ',')) != NULL) { |
254 |
|
255 |
// Cut string after the first ',' |
256 |
*p++ = 0; |
257 |
|
258 |
switch (*p) { |
259 |
case 'P': |
260 |
*filetype = FTYPE_PRG; |
261 |
break; |
262 |
case 'S': |
263 |
*filetype = FTYPE_SEQ; |
264 |
break; |
265 |
case 'U': |
266 |
*filetype = FTYPE_USR; |
267 |
break; |
268 |
case 'L': |
269 |
*filetype = FTYPE_REL; |
270 |
break; |
271 |
case 'R': |
272 |
*filemode = FMODE_READ; |
273 |
break; |
274 |
case 'W': |
275 |
*filemode = FMODE_WRITE; |
276 |
break; |
277 |
case 'A': |
278 |
*filemode = FMODE_APPEND; |
279 |
break; |
280 |
} |
281 |
} |
282 |
} |
283 |
|
284 |
|
285 |
/* |
286 |
* Search file in directory, find first track and sector |
287 |
* false: not found, true: found |
288 |
*/ |
289 |
|
290 |
bool D64Drive::find_file(char *filename, int *track, int *sector) |
291 |
{ |
292 |
int i, j; |
293 |
uint8 *p, *q; |
294 |
DirEntry *de; |
295 |
|
296 |
// Scan all directory blocks |
297 |
dir.next_track = bam->dir_track; |
298 |
dir.next_sector = bam->dir_sector; |
299 |
|
300 |
while (dir.next_track) { |
301 |
if (!read_sector(dir.next_track, dir.next_sector, (uint8 *) &dir.next_track)) |
302 |
return false; |
303 |
|
304 |
// Scan all 8 entries of a block |
305 |
for (j=0; j<8; j++) { |
306 |
de = &dir.entry[j]; |
307 |
*track = de->track; |
308 |
*sector = de->sector; |
309 |
|
310 |
if (de->type) { |
311 |
p = (uint8 *)filename; |
312 |
q = de->name; |
313 |
for (i=0; i<16 && *p; i++, p++, q++) { |
314 |
if (*p == '*') // Wildcard '*' matches all following characters |
315 |
return true; |
316 |
if (*p != *q) { |
317 |
if (*p != '?') goto next_entry; // Wildcard '?' matches single character |
318 |
if (*q == 0xa0) goto next_entry; |
319 |
} |
320 |
} |
321 |
|
322 |
if (i == 16 || *q == 0xa0) |
323 |
return true; |
324 |
} |
325 |
next_entry: ; |
326 |
} |
327 |
} |
328 |
|
329 |
return false; |
330 |
} |
331 |
|
332 |
|
333 |
/* |
334 |
* Open file given track/sector of first block |
335 |
*/ |
336 |
|
337 |
uint8 D64Drive::open_file_ts(int channel, int track, int sector) |
338 |
{ |
339 |
chan_buf[channel] = new uint8[256]; |
340 |
chan_mode[channel] = CHMOD_FILE; |
341 |
|
342 |
// On the next call to Read, the first block will be read |
343 |
chan_buf[channel][0] = track; |
344 |
chan_buf[channel][1] = sector; |
345 |
buf_len[channel] = 0; |
346 |
|
347 |
return ST_OK; |
348 |
} |
349 |
|
350 |
|
351 |
/* |
352 |
* Prepare directory as BASIC program (channel 0) |
353 |
*/ |
354 |
|
355 |
const char type_char_1[] = "DSPUREERSELQGRL?"; |
356 |
const char type_char_2[] = "EERSELQGRL??????"; |
357 |
const char type_char_3[] = "LQGRL???????????"; |
358 |
|
359 |
// Return true if name 'n' matches pattern 'p' |
360 |
static bool match(uint8 *p, uint8 *n) |
361 |
{ |
362 |
if (!*p) // Null pattern matches everything |
363 |
return true; |
364 |
|
365 |
do { |
366 |
if (*p == '*') // Wildcard '*' matches all following characters |
367 |
return true; |
368 |
if ((*p != *n) && (*p != '?')) // Wildcard '?' matches single character |
369 |
return false; |
370 |
p++; n++; |
371 |
} while (*p); |
372 |
|
373 |
return *n == 0xa0; |
374 |
} |
375 |
|
376 |
uint8 D64Drive::open_directory(char *pattern) |
377 |
{ |
378 |
int i, j, n, m; |
379 |
uint8 *p, *q; |
380 |
DirEntry *de; |
381 |
uint8 c; |
382 |
char *tmppat; |
383 |
|
384 |
// Special treatment for "$0" |
385 |
if (pattern[0] == '0' && pattern[1] == 0) |
386 |
pattern += 1; |
387 |
|
388 |
// Skip everything before the ':' in the pattern |
389 |
if ((tmppat = strchr(pattern, ':')) != NULL) |
390 |
pattern = tmppat + 1; |
391 |
|
392 |
p = buf_ptr[0] = chan_buf[0] = new uint8[8192]; |
393 |
chan_mode[0] = CHMOD_DIRECTORY; |
394 |
|
395 |
// Create directory title |
396 |
*p++ = 0x01; // Load address $0401 (from PET days :-) |
397 |
*p++ = 0x04; |
398 |
*p++ = 0x01; // Dummy line link |
399 |
*p++ = 0x01; |
400 |
*p++ = 0; // Drive number (0) as line number |
401 |
*p++ = 0; |
402 |
*p++ = 0x12; // RVS ON |
403 |
*p++ = '\"'; |
404 |
|
405 |
q = bam->disk_name; |
406 |
for (i=0; i<23; i++) { |
407 |
if ((c = *q++) == 0xa0) |
408 |
*p++ = ' '; // Replace 0xa0 by space |
409 |
else |
410 |
*p++ = c; |
411 |
} |
412 |
*(p-7) = '\"'; |
413 |
*p++ = 0; |
414 |
|
415 |
// Scan all directory blocks |
416 |
dir.next_track = bam->dir_track; |
417 |
dir.next_sector = bam->dir_sector; |
418 |
|
419 |
while (dir.next_track) { |
420 |
if (!read_sector(dir.next_track, dir.next_sector, (uint8 *) &dir.next_track)) |
421 |
return ST_OK; |
422 |
|
423 |
// Scan all 8 entries of a block |
424 |
for (j=0; j<8; j++) { |
425 |
de = &dir.entry[j]; |
426 |
|
427 |
if (de->type && match((uint8 *)pattern, de->name)) { |
428 |
*p++ = 0x01; // Dummy line link |
429 |
*p++ = 0x01; |
430 |
|
431 |
*p++ = de->num_blocks_l; // Line number |
432 |
*p++ = de->num_blocks_h; |
433 |
|
434 |
*p++ = ' '; |
435 |
n = (de->num_blocks_h << 8) + de->num_blocks_l; |
436 |
if (n<10) *p++ = ' '; |
437 |
if (n<100) *p++ = ' '; |
438 |
|
439 |
*p++ = '\"'; |
440 |
q = de->name; |
441 |
m = 0; |
442 |
for (i=0; i<16; i++) { |
443 |
if ((c = *q++) == 0xa0) { |
444 |
if (m) |
445 |
*p++ = ' '; // Replace all 0xa0 by spaces |
446 |
else |
447 |
m = *p++ = '\"'; // But the first by a '"' |
448 |
} else |
449 |
*p++ = c; |
450 |
} |
451 |
if (m) |
452 |
*p++ = ' '; |
453 |
else |
454 |
*p++ = '\"'; // No 0xa0, then append a space |
455 |
|
456 |
if (de->type & 0x80) |
457 |
*p++ = ' '; |
458 |
else |
459 |
*p++ = '*'; |
460 |
|
461 |
*p++ = type_char_1[de->type & 0x0f]; |
462 |
*p++ = type_char_2[de->type & 0x0f]; |
463 |
*p++ = type_char_3[de->type & 0x0f]; |
464 |
|
465 |
if (de->type & 0x40) |
466 |
*p++ = '<'; |
467 |
else |
468 |
*p++ = ' '; |
469 |
|
470 |
*p++ = ' '; |
471 |
if (n >= 10) *p++ = ' '; |
472 |
if (n >= 100) *p++ = ' '; |
473 |
*p++ = 0; |
474 |
} |
475 |
} |
476 |
} |
477 |
|
478 |
// Final line |
479 |
q = p; |
480 |
for (i=0; i<29; i++) |
481 |
*q++ = ' '; |
482 |
|
483 |
n = 0; |
484 |
for (i=0; i<35; i++) |
485 |
n += bam->bitmap[i*4]; |
486 |
|
487 |
*p++ = 0x01; // Dummy line link |
488 |
*p++ = 0x01; |
489 |
*p++ = n & 0xff; // Number of free blocks as line number |
490 |
*p++ = (n >> 8) & 0xff; |
491 |
|
492 |
*p++ = 'B'; |
493 |
*p++ = 'L'; |
494 |
*p++ = 'O'; |
495 |
*p++ = 'C'; |
496 |
*p++ = 'K'; |
497 |
*p++ = 'S'; |
498 |
*p++ = ' '; |
499 |
*p++ = 'F'; |
500 |
*p++ = 'R'; |
501 |
*p++ = 'E'; |
502 |
*p++ = 'E'; |
503 |
*p++ = '.'; |
504 |
|
505 |
p = q; |
506 |
*p++ = 0; |
507 |
*p++ = 0; |
508 |
*p++ = 0; |
509 |
|
510 |
buf_len[0] = p - chan_buf[0]; |
511 |
|
512 |
return ST_OK; |
513 |
} |
514 |
|
515 |
|
516 |
/* |
517 |
* Open channel for direct buffer access |
518 |
*/ |
519 |
|
520 |
uint8 D64Drive::open_direct(int channel, char *filename) |
521 |
{ |
522 |
int buf = -1; |
523 |
|
524 |
if (filename[1] == 0) |
525 |
buf = alloc_buffer(-1); |
526 |
else |
527 |
if ((filename[1] >= '0') && (filename[1] <= '3') && (filename[2] == 0)) |
528 |
buf = alloc_buffer(filename[1] - '0'); |
529 |
|
530 |
if (buf == -1) { |
531 |
set_error(ERR_NOCHANNEL); |
532 |
return ST_OK; |
533 |
} |
534 |
|
535 |
// The buffers are in the 1541 RAM at $300 and are 256 bytes each |
536 |
chan_buf[channel] = buf_ptr[channel] = ram + 0x300 + (buf << 8); |
537 |
chan_mode[channel] = CHMOD_DIRECT; |
538 |
chan_buf_num[channel] = buf; |
539 |
|
540 |
// Store actual buffer number in buffer |
541 |
*chan_buf[channel] = buf + '0'; |
542 |
buf_len[channel] = 1; |
543 |
|
544 |
return ST_OK; |
545 |
} |
546 |
|
547 |
|
548 |
/* |
549 |
* Close channel |
550 |
*/ |
551 |
|
552 |
uint8 D64Drive::Close(int channel) |
553 |
{ |
554 |
if (channel == 15) { |
555 |
close_all_channels(); |
556 |
return ST_OK; |
557 |
} |
558 |
|
559 |
switch (chan_mode[channel]) { |
560 |
case CHMOD_FREE: |
561 |
break; |
562 |
|
563 |
case CHMOD_DIRECT: |
564 |
free_buffer(chan_buf_num[channel]); |
565 |
chan_buf[channel] = NULL; |
566 |
chan_mode[channel] = CHMOD_FREE; |
567 |
break; |
568 |
|
569 |
default: |
570 |
delete[] chan_buf[channel]; |
571 |
chan_buf[channel] = NULL; |
572 |
chan_mode[channel] = CHMOD_FREE; |
573 |
break; |
574 |
} |
575 |
|
576 |
return ST_OK; |
577 |
} |
578 |
|
579 |
|
580 |
/* |
581 |
* Close all channels |
582 |
*/ |
583 |
|
584 |
void D64Drive::close_all_channels() |
585 |
{ |
586 |
for (int i=0; i<15; i++) |
587 |
Close(i); |
588 |
|
589 |
cmd_len = 0; |
590 |
} |
591 |
|
592 |
|
593 |
/* |
594 |
* Read from channel |
595 |
*/ |
596 |
|
597 |
uint8 D64Drive::Read(int channel, uint8 *byte) |
598 |
{ |
599 |
switch (chan_mode[channel]) { |
600 |
case CHMOD_COMMAND: |
601 |
*byte = *error_ptr++; |
602 |
if (--error_len) |
603 |
return ST_OK; |
604 |
else { |
605 |
set_error(ERR_OK); |
606 |
return ST_EOF; |
607 |
} |
608 |
break; |
609 |
|
610 |
case CHMOD_FILE: |
611 |
// Read next block if necessary |
612 |
if (chan_buf[channel][0] && !buf_len[channel]) { |
613 |
if (!read_sector(chan_buf[channel][0], chan_buf[channel][1], chan_buf[channel])) |
614 |
return ST_READ_TIMEOUT; |
615 |
buf_ptr[channel] = chan_buf[channel] + 2; |
616 |
|
617 |
// Determine block length |
618 |
buf_len[channel] = chan_buf[channel][0] ? 254 : (uint8)chan_buf[channel][1]-1; |
619 |
} |
620 |
|
621 |
if (buf_len[channel] > 0) { |
622 |
*byte = *buf_ptr[channel]++; |
623 |
if (!--buf_len[channel] && !chan_buf[channel][0]) |
624 |
return ST_EOF; |
625 |
else |
626 |
return ST_OK; |
627 |
} else |
628 |
return ST_READ_TIMEOUT; |
629 |
break; |
630 |
|
631 |
case CHMOD_DIRECTORY: |
632 |
case CHMOD_DIRECT: |
633 |
if (buf_len[channel] > 0) { |
634 |
*byte = *buf_ptr[channel]++; |
635 |
if (--buf_len[channel]) |
636 |
return ST_OK; |
637 |
else |
638 |
return ST_EOF; |
639 |
} else |
640 |
return ST_READ_TIMEOUT; |
641 |
break; |
642 |
} |
643 |
return ST_READ_TIMEOUT; |
644 |
} |
645 |
|
646 |
|
647 |
/* |
648 |
* Write byte to channel |
649 |
*/ |
650 |
|
651 |
uint8 D64Drive::Write(int channel, uint8 byte, bool eoi) |
652 |
{ |
653 |
switch (chan_mode[channel]) { |
654 |
case CHMOD_FREE: |
655 |
set_error(ERR_FILENOTOPEN); |
656 |
break; |
657 |
|
658 |
case CHMOD_COMMAND: |
659 |
// Collect characters and execute command on EOI |
660 |
if (cmd_len >= 40) |
661 |
return ST_TIMEOUT; |
662 |
|
663 |
cmd_buffer[cmd_len++] = byte; |
664 |
|
665 |
if (eoi) { |
666 |
cmd_buffer[cmd_len++] = 0; |
667 |
cmd_len = 0; |
668 |
execute_command(cmd_buffer); |
669 |
} |
670 |
return ST_OK; |
671 |
|
672 |
case CHMOD_DIRECTORY: |
673 |
set_error(ERR_WRITEFILEOPEN); |
674 |
break; |
675 |
} |
676 |
return ST_TIMEOUT; |
677 |
} |
678 |
|
679 |
|
680 |
/* |
681 |
* Execute command string |
682 |
*/ |
683 |
|
684 |
void D64Drive::execute_command(char *command) |
685 |
{ |
686 |
uint16 adr; |
687 |
int len; |
688 |
|
689 |
switch (command[0]) { |
690 |
case 'B': |
691 |
if (command[1] != '-') |
692 |
set_error(ERR_SYNTAX30); |
693 |
else |
694 |
switch (command[2]) { |
695 |
case 'R': |
696 |
block_read_cmd(&command[3]); |
697 |
break; |
698 |
|
699 |
case 'P': |
700 |
buffer_ptr_cmd(&command[3]); |
701 |
break; |
702 |
|
703 |
case 'A': |
704 |
case 'F': |
705 |
case 'W': |
706 |
set_error(ERR_WRITEPROTECT); |
707 |
break; |
708 |
|
709 |
default: |
710 |
set_error(ERR_SYNTAX30); |
711 |
break; |
712 |
} |
713 |
break; |
714 |
|
715 |
case 'M': |
716 |
if (command[1] != '-') |
717 |
set_error(ERR_SYNTAX30); |
718 |
else |
719 |
switch (command[2]) { |
720 |
case 'R': |
721 |
adr = ((uint8)command[4] << 8) | ((uint8)command[3]); |
722 |
error_ptr = (char *)(ram + (adr & 0x07ff)); |
723 |
if (!(error_len = (uint8)command[5])) |
724 |
error_len = 1; |
725 |
break; |
726 |
|
727 |
case 'W': |
728 |
adr = ((uint8)command[4] << 8) | ((uint8)command[3]); |
729 |
len = (uint8)command[5]; |
730 |
for (int i=0; i<len; i++) |
731 |
ram[adr+i] = (uint8)command[i+6]; |
732 |
break; |
733 |
|
734 |
default: |
735 |
set_error(ERR_SYNTAX30); |
736 |
} |
737 |
break; |
738 |
|
739 |
case 'I': |
740 |
close_all_channels(); |
741 |
read_sector(18, 0, (uint8 *)bam); |
742 |
set_error(ERR_OK); |
743 |
break; |
744 |
|
745 |
case 'U': |
746 |
switch (command[1] & 0x0f) { |
747 |
case 1: // U1/UA: Block-Read |
748 |
block_read_cmd(&command[2]); |
749 |
break; |
750 |
|
751 |
case 2: // U2/UB: Block-Write |
752 |
set_error(ERR_WRITEPROTECT); |
753 |
break; |
754 |
|
755 |
case 10: // U:/UJ: Reset |
756 |
Reset(); |
757 |
break; |
758 |
|
759 |
default: |
760 |
set_error(ERR_SYNTAX30); |
761 |
break; |
762 |
} |
763 |
break; |
764 |
|
765 |
case 'G': |
766 |
if (command[1] != ':') |
767 |
set_error(ERR_SYNTAX30); |
768 |
else |
769 |
chd64_cmd(&command[2]); |
770 |
break; |
771 |
|
772 |
case 'C': |
773 |
case 'N': |
774 |
case 'R': |
775 |
case 'S': |
776 |
case 'V': |
777 |
set_error(ERR_WRITEPROTECT); |
778 |
break; |
779 |
|
780 |
default: |
781 |
set_error(ERR_SYNTAX30); |
782 |
break; |
783 |
} |
784 |
} |
785 |
|
786 |
|
787 |
/* |
788 |
* Execute B-R command |
789 |
*/ |
790 |
|
791 |
void D64Drive::block_read_cmd(char *command) |
792 |
{ |
793 |
int channel, drvnum, track, sector; |
794 |
|
795 |
if (parse_bcmd(command, &channel, &drvnum, &track, §or)) { |
796 |
if (chan_mode[channel] == CHMOD_DIRECT) { |
797 |
read_sector(track, sector, buf_ptr[channel] = chan_buf[channel]); |
798 |
buf_len[channel] = 256; |
799 |
set_error(ERR_OK); |
800 |
} else |
801 |
set_error(ERR_NOCHANNEL); |
802 |
} else |
803 |
set_error(ERR_SYNTAX30); |
804 |
} |
805 |
|
806 |
|
807 |
/* |
808 |
* Execute B-P command |
809 |
*/ |
810 |
|
811 |
void D64Drive::buffer_ptr_cmd(char *command) |
812 |
{ |
813 |
int channel, pointer, i; |
814 |
|
815 |
if (parse_bcmd(command, &channel, &pointer, &i, &i)) { |
816 |
if (chan_mode[channel] == CHMOD_DIRECT) { |
817 |
buf_ptr[channel] = chan_buf[channel] + pointer; |
818 |
buf_len[channel] = 256 - pointer; |
819 |
set_error(ERR_OK); |
820 |
} else |
821 |
set_error(ERR_NOCHANNEL); |
822 |
} else |
823 |
set_error(ERR_SYNTAX30); |
824 |
} |
825 |
|
826 |
|
827 |
/* |
828 |
* Parse block command parameters |
829 |
* true: OK, false: error |
830 |
*/ |
831 |
|
832 |
bool D64Drive::parse_bcmd(char *cmd, int *arg1, int *arg2, int *arg3, int *arg4) |
833 |
{ |
834 |
int i; |
835 |
|
836 |
if (*cmd == ':') cmd++; |
837 |
|
838 |
// Read four parameters separated by space, cursor right or comma |
839 |
while (*cmd == ' ' || *cmd == 0x1d || *cmd == 0x2c) cmd++; |
840 |
if (!*cmd) return false; |
841 |
|
842 |
i = 0; |
843 |
while (*cmd >= 0x30 && *cmd < 0x40) { |
844 |
i *= 10; |
845 |
i += *cmd++ & 0x0f; |
846 |
} |
847 |
*arg1 = i & 0xff; |
848 |
|
849 |
while (*cmd == ' ' || *cmd == 0x1d || *cmd == 0x2c) cmd++; |
850 |
if (!*cmd) return false; |
851 |
|
852 |
i = 0; |
853 |
while (*cmd >= 0x30 && *cmd < 0x40) { |
854 |
i *= 10; |
855 |
i += *cmd++ & 0x0f; |
856 |
} |
857 |
*arg2 = i & 0xff; |
858 |
|
859 |
while (*cmd == ' ' || *cmd == 0x1d || *cmd == 0x2c) cmd++; |
860 |
if (!*cmd) return false; |
861 |
|
862 |
i = 0; |
863 |
while (*cmd >= 0x30 && *cmd < 0x40) { |
864 |
i *= 10; |
865 |
i += *cmd++ & 0x0f; |
866 |
} |
867 |
*arg3 = i & 0xff; |
868 |
|
869 |
while (*cmd == ' ' || *cmd == 0x1d || *cmd == 0x2c) cmd++; |
870 |
if (!*cmd) return false; |
871 |
|
872 |
i = 0; |
873 |
while (*cmd >= 0x30 && *cmd < 0x40) { |
874 |
i *= 10; |
875 |
i += *cmd++ & 0x0f; |
876 |
} |
877 |
*arg4 = i & 0xff; |
878 |
|
879 |
return true; |
880 |
} |
881 |
|
882 |
|
883 |
/* |
884 |
* Execute 'G' command |
885 |
*/ |
886 |
|
887 |
void D64Drive::chd64_cmd(char *d64name) |
888 |
{ |
889 |
char str[NAMEBUF_LENGTH]; |
890 |
char *p = str; |
891 |
|
892 |
// Convert .d64 file name |
893 |
for (int i=0; i<NAMEBUF_LENGTH && (*p++ = conv_from_64(*d64name++, false)); i++) ; |
894 |
|
895 |
close_all_channels(); |
896 |
|
897 |
// G:. resets the .d64 file name to its original setting |
898 |
if (str[0] == '.' && str[1] == 0) |
899 |
open_close_d64_file(orig_d64_name); |
900 |
else |
901 |
open_close_d64_file(str); |
902 |
|
903 |
// Read BAM |
904 |
read_sector(18, 0, (uint8 *)bam); |
905 |
} |
906 |
|
907 |
|
908 |
/* |
909 |
* Reset drive |
910 |
*/ |
911 |
|
912 |
void D64Drive::Reset(void) |
913 |
{ |
914 |
close_all_channels(); |
915 |
|
916 |
read_sector(18, 0, (uint8 *)bam); |
917 |
|
918 |
cmd_len = 0; |
919 |
for (int i=0; i<4; i++) |
920 |
buf_free[i] = true; |
921 |
|
922 |
set_error(ERR_STARTUP); |
923 |
} |
924 |
|
925 |
|
926 |
/* |
927 |
* Allocate floppy buffer |
928 |
* -> Desired buffer number or -1 |
929 |
* <- Allocated buffer number or -1 |
930 |
*/ |
931 |
|
932 |
int D64Drive::alloc_buffer(int want) |
933 |
{ |
934 |
if (want == -1) { |
935 |
for (want=3; want>=0; want--) |
936 |
if (buf_free[want]) { |
937 |
buf_free[want] = false; |
938 |
return want; |
939 |
} |
940 |
return -1; |
941 |
} |
942 |
|
943 |
if (want < 4) |
944 |
if (buf_free[want]) { |
945 |
buf_free[want] = false; |
946 |
return want; |
947 |
} else |
948 |
return -1; |
949 |
else |
950 |
return -1; |
951 |
} |
952 |
|
953 |
|
954 |
/* |
955 |
* Free floppy buffer |
956 |
*/ |
957 |
|
958 |
void D64Drive::free_buffer(int buf) |
959 |
{ |
960 |
buf_free[buf] = true; |
961 |
} |
962 |
|
963 |
|
964 |
/* |
965 |
* Read sector (256 bytes) |
966 |
* true: success, false: error |
967 |
*/ |
968 |
|
969 |
bool D64Drive::read_sector(int track, int sector, uint8 *buffer) |
970 |
{ |
971 |
int offset; |
972 |
|
973 |
// Convert track/sector to byte offset in file |
974 |
if ((offset = offset_from_ts(track, sector)) < 0) { |
975 |
set_error(ERR_ILLEGALTS); |
976 |
return false; |
977 |
} |
978 |
|
979 |
if (the_file == NULL) { |
980 |
set_error(ERR_NOTREADY); |
981 |
return false; |
982 |
} |
983 |
|
984 |
#ifdef AMIGA |
985 |
if (offset != ftell(the_file)) |
986 |
fseek(the_file, offset + image_header, SEEK_SET); |
987 |
#else |
988 |
fseek(the_file, offset + image_header, SEEK_SET); |
989 |
#endif |
990 |
fread(buffer, 256, 1, the_file); |
991 |
return true; |
992 |
} |
993 |
|
994 |
|
995 |
/* |
996 |
* Convert track/sector to offset |
997 |
*/ |
998 |
|
999 |
const int num_sectors[41] = { |
1000 |
0, |
1001 |
21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21, |
1002 |
19,19,19,19,19,19,19, |
1003 |
18,18,18,18,18,18, |
1004 |
17,17,17,17,17, |
1005 |
17,17,17,17,17 // Tracks 36..40 |
1006 |
}; |
1007 |
|
1008 |
const int sector_offset[41] = { |
1009 |
0, |
1010 |
0,21,42,63,84,105,126,147,168,189,210,231,252,273,294,315,336, |
1011 |
357,376,395,414,433,452,471, |
1012 |
490,508,526,544,562,580, |
1013 |
598,615,632,649,666, |
1014 |
683,700,717,734,751 // Tracks 36..40 |
1015 |
}; |
1016 |
|
1017 |
int D64Drive::offset_from_ts(int track, int sector) |
1018 |
{ |
1019 |
if ((track < 1) || (track > NUM_TRACKS) || |
1020 |
(sector < 0) || (sector >= num_sectors[track])) |
1021 |
return -1; |
1022 |
|
1023 |
return (sector_offset[track] + sector) << 8; |
1024 |
} |
1025 |
|
1026 |
|
1027 |
/* |
1028 |
* Conversion PETSCII->ASCII |
1029 |
*/ |
1030 |
|
1031 |
uint8 D64Drive::conv_from_64(uint8 c, bool map_slash) |
1032 |
{ |
1033 |
if ((c >= 'A') && (c <= 'Z') || (c >= 'a') && (c <= 'z')) |
1034 |
return c ^ 0x20; |
1035 |
if ((c >= 0xc1) && (c <= 0xda)) |
1036 |
return c ^ 0x80; |
1037 |
if ((c == '/') && map_slash && ThePrefs.MapSlash) |
1038 |
return '\\'; |
1039 |
return c; |
1040 |
} |