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 |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
9 |
* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 |
*/ |
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|
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/* |
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* Incompatibilities: |
23 |
* ------------------ |
24 |
* |
25 |
* - Only read accesses possible |
26 |
* - Not all commands implemented |
27 |
* - The .d64 error info is read, but unused |
28 |
*/ |
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|
30 |
#include "sysdeps.h" |
31 |
|
32 |
#include "1541d64.h" |
33 |
#include "IEC.h" |
34 |
#include "Prefs.h" |
35 |
#include "C64.h" |
36 |
|
37 |
|
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// 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 |
// Number of tracks/sectors |
48 |
const int NUM_TRACKS = 35; |
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const int NUM_SECTORS = 683; |
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|
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// Prototypes |
52 |
static bool match(uint8 *p, uint8 *n); |
53 |
|
54 |
|
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/* |
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* Constructor: Prepare emulation, open .d64 file |
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*/ |
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|
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D64Drive::D64Drive(IEC *iec, char *filepath) : Drive(iec) |
60 |
{ |
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the_file = NULL; |
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ram = NULL; |
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|
64 |
Ready = false; |
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strcpy(orig_d64_name, filepath); |
66 |
for (int i=0; i<=14; i++) { |
67 |
chan_mode[i] = CHMOD_FREE; |
68 |
chan_buf[i] = NULL; |
69 |
} |
70 |
chan_mode[15] = CHMOD_COMMAND; |
71 |
|
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// Open .d64 file |
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open_close_d64_file(filepath); |
74 |
if (the_file != NULL) { |
75 |
|
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// Allocate 1541 RAM |
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ram = new uint8[DRIVE_RAM_SIZE]; |
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bam = (BAM *)(ram + 0x700); |
79 |
|
80 |
Reset(); |
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Ready = true; |
82 |
} |
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} |
84 |
|
85 |
|
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/* |
87 |
* Destructor |
88 |
*/ |
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|
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D64Drive::~D64Drive() |
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{ |
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// Close .d64 file |
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open_close_d64_file(""); |
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|
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delete[] ram; |
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Ready = false; |
97 |
} |
98 |
|
99 |
|
100 |
/* |
101 |
* Open/close the .d64 file |
102 |
*/ |
103 |
|
104 |
void D64Drive::open_close_d64_file(char *d64name) |
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{ |
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long size; |
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uint8 magic[4]; |
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|
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// Close old .d64, if open |
110 |
if (the_file != NULL) { |
111 |
close_all_channels(); |
112 |
fclose(the_file); |
113 |
the_file = NULL; |
114 |
} |
115 |
|
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// Open new .d64 file |
117 |
if (d64name[0]) { |
118 |
if ((the_file = fopen(d64name, "rb")) != NULL) { |
119 |
|
120 |
// Check length |
121 |
fseek(the_file, 0, SEEK_END); |
122 |
if ((size = ftell(the_file)) < NUM_SECTORS * 256) { |
123 |
fclose(the_file); |
124 |
the_file = NULL; |
125 |
return; |
126 |
} |
127 |
|
128 |
// x64 image? |
129 |
rewind(the_file); |
130 |
fread(&magic, 4, 1, the_file); |
131 |
if (magic[0] == 0x43 && magic[1] == 0x15 && magic[2] == 0x41 && magic[3] == 0x64) |
132 |
image_header = 64; |
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else |
134 |
image_header = 0; |
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|
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// Preset error info (all sectors no error) |
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memset(error_info, 1, NUM_SECTORS); |
138 |
|
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// Load sector error info from .d64 file, if present |
140 |
if (!image_header && size == NUM_SECTORS * 257) { |
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fseek(the_file, NUM_SECTORS * 256, SEEK_SET); |
142 |
fread(&error_info, NUM_SECTORS, 1, the_file); |
143 |
} |
144 |
} |
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} |
146 |
} |
147 |
|
148 |
|
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/* |
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* Open channel |
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*/ |
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|
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uint8 D64Drive::Open(int channel, const uint8 *name, int name_len) |
154 |
{ |
155 |
set_error(ERR_OK); |
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|
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// Channel 15: execute file name as command |
158 |
if (channel == 15) { |
159 |
execute_cmd(name, name_len); |
160 |
return ST_OK; |
161 |
} |
162 |
|
163 |
if (chan_mode[channel] != CHMOD_FREE) { |
164 |
set_error(ERR_NOCHANNEL); |
165 |
return ST_OK; |
166 |
} |
167 |
|
168 |
if (name[0] == '$') |
169 |
if (channel) |
170 |
return open_file_ts(channel, 18, 0); |
171 |
else |
172 |
return open_directory(name + 1, name_len - 1); |
173 |
|
174 |
if (name[0] == '#') |
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return open_direct(channel, name); |
176 |
|
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return open_file(channel, name, name_len); |
178 |
} |
179 |
|
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|
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/* |
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* Open file |
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*/ |
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|
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uint8 D64Drive::open_file(int channel, const uint8 *name, int name_len) |
186 |
{ |
187 |
uint8 plain_name[256]; |
188 |
int plain_name_len; |
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int mode = FMODE_READ; |
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int type = FTYPE_PRG; |
191 |
int rec_len = 0; |
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parse_file_name(name, name_len, plain_name, plain_name_len, mode, type, rec_len); |
193 |
if (plain_name_len > 16) |
194 |
plain_name_len = 16; |
195 |
|
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// Channel 0 is READ, channel 1 is WRITE |
197 |
if (channel == 0 || channel == 1) { |
198 |
mode = channel ? FMODE_WRITE : FMODE_READ; |
199 |
if (type == FTYPE_DEL) |
200 |
type = FTYPE_PRG; |
201 |
} |
202 |
|
203 |
// Allow only read accesses |
204 |
if (mode != FMODE_READ) { |
205 |
set_error(ERR_WRITEPROTECT); |
206 |
return ST_OK; |
207 |
} |
208 |
|
209 |
// Relative files are not supported |
210 |
if (type == FTYPE_REL) { |
211 |
set_error(ERR_UNIMPLEMENTED); |
212 |
return ST_OK; |
213 |
} |
214 |
|
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// Find file in directory and open it |
216 |
int track, sector; |
217 |
if (find_file(plain_name, &track, §or)) |
218 |
return open_file_ts(channel, track, sector); |
219 |
else |
220 |
set_error(ERR_FILENOTFOUND); |
221 |
|
222 |
return ST_OK; |
223 |
} |
224 |
|
225 |
|
226 |
/* |
227 |
* Search file in directory, find first track and sector |
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* false: not found, true: found |
229 |
*/ |
230 |
|
231 |
bool D64Drive::find_file(const uint8 *pattern, int *track, int *sector) |
232 |
{ |
233 |
int i, j; |
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const uint8 *p, *q; |
235 |
DirEntry *de; |
236 |
|
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// Scan all directory blocks |
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dir.next_track = bam->dir_track; |
239 |
dir.next_sector = bam->dir_sector; |
240 |
|
241 |
while (dir.next_track) { |
242 |
if (!read_sector(dir.next_track, dir.next_sector, (uint8 *) &dir.next_track)) |
243 |
return false; |
244 |
|
245 |
// Scan all 8 entries of a block |
246 |
for (j=0; j<8; j++) { |
247 |
de = &dir.entry[j]; |
248 |
*track = de->track; |
249 |
*sector = de->sector; |
250 |
|
251 |
if (de->type) { |
252 |
p = pattern; |
253 |
q = de->name; |
254 |
for (i=0; i<16 && *p; i++, p++, q++) { |
255 |
if (*p == '*') // Wildcard '*' matches all following characters |
256 |
return true; |
257 |
if (*p != *q) { |
258 |
if (*p != '?') goto next_entry; // Wildcard '?' matches single character |
259 |
if (*q == 0xa0) goto next_entry; |
260 |
} |
261 |
} |
262 |
|
263 |
if (i == 16 || *q == 0xa0) |
264 |
return true; |
265 |
} |
266 |
next_entry: ; |
267 |
} |
268 |
} |
269 |
|
270 |
return false; |
271 |
} |
272 |
|
273 |
|
274 |
/* |
275 |
* Open file given track/sector of first block |
276 |
*/ |
277 |
|
278 |
uint8 D64Drive::open_file_ts(int channel, int track, int sector) |
279 |
{ |
280 |
chan_buf[channel] = new uint8[256]; |
281 |
chan_mode[channel] = CHMOD_FILE; |
282 |
|
283 |
// On the next call to Read, the first block will be read |
284 |
chan_buf[channel][0] = track; |
285 |
chan_buf[channel][1] = sector; |
286 |
buf_len[channel] = 0; |
287 |
|
288 |
return ST_OK; |
289 |
} |
290 |
|
291 |
|
292 |
/* |
293 |
* Prepare directory as BASIC program (channel 0) |
294 |
*/ |
295 |
|
296 |
const char type_char_1[] = "DSPUREERSELQGRL?"; |
297 |
const char type_char_2[] = "EERSELQGRL??????"; |
298 |
const char type_char_3[] = "LQGRL???????????"; |
299 |
|
300 |
// Return true if name 'n' matches pattern 'p' |
301 |
static bool match(uint8 *p, uint8 *n) |
302 |
{ |
303 |
if (!*p) // Null pattern matches everything |
304 |
return true; |
305 |
|
306 |
do { |
307 |
if (*p == '*') // Wildcard '*' matches all following characters |
308 |
return true; |
309 |
if ((*p != *n) && (*p != '?')) // Wildcard '?' matches single character |
310 |
return false; |
311 |
p++; n++; |
312 |
} while (*p); |
313 |
|
314 |
return *n == 0xa0; |
315 |
} |
316 |
|
317 |
uint8 D64Drive::open_directory(const uint8 *pattern, int pattern_len) |
318 |
{ |
319 |
// Special treatment for "$0" |
320 |
if (pattern[0] == '0' && pattern[1] == 0) { |
321 |
pattern++; |
322 |
pattern_len--; |
323 |
} |
324 |
|
325 |
// Skip everything before the ':' in the pattern |
326 |
uint8 *t = (uint8 *)memchr(pattern, ':', pattern_len); |
327 |
if (t) { |
328 |
t++; |
329 |
pattern_len -= t - pattern; |
330 |
pattern = t; |
331 |
} |
332 |
|
333 |
chan_mode[0] = CHMOD_DIRECTORY; |
334 |
uint8 *p = buf_ptr[0] = chan_buf[0] = new uint8[8192]; |
335 |
|
336 |
// Create directory title |
337 |
*p++ = 0x01; // Load address $0401 (from PET days :-) |
338 |
*p++ = 0x04; |
339 |
*p++ = 0x01; // Dummy line link |
340 |
*p++ = 0x01; |
341 |
*p++ = 0; // Drive number (0) as line number |
342 |
*p++ = 0; |
343 |
*p++ = 0x12; // RVS ON |
344 |
*p++ = '\"'; |
345 |
|
346 |
uint8 *q = bam->disk_name; |
347 |
for (int i=0; i<23; i++) { |
348 |
int c; |
349 |
if ((c = *q++) == 0xa0) |
350 |
*p++ = ' '; // Replace 0xa0 by space |
351 |
else |
352 |
*p++ = c; |
353 |
} |
354 |
*(p-7) = '\"'; |
355 |
*p++ = 0; |
356 |
|
357 |
// Scan all directory blocks |
358 |
dir.next_track = bam->dir_track; |
359 |
dir.next_sector = bam->dir_sector; |
360 |
|
361 |
while (dir.next_track) { |
362 |
if (!read_sector(dir.next_track, dir.next_sector, (uint8 *) &dir.next_track)) |
363 |
return ST_OK; |
364 |
|
365 |
// Scan all 8 entries of a block |
366 |
for (int j=0; j<8; j++) { |
367 |
DirEntry *de = &dir.entry[j]; |
368 |
|
369 |
if (de->type && match((uint8 *)pattern, de->name)) { |
370 |
*p++ = 0x01; // Dummy line link |
371 |
*p++ = 0x01; |
372 |
|
373 |
*p++ = de->num_blocks_l; // Line number |
374 |
*p++ = de->num_blocks_h; |
375 |
|
376 |
*p++ = ' '; |
377 |
int n = (de->num_blocks_h << 8) + de->num_blocks_l; |
378 |
if (n<10) *p++ = ' '; |
379 |
if (n<100) *p++ = ' '; |
380 |
|
381 |
*p++ = '\"'; |
382 |
q = de->name; |
383 |
uint8 c; |
384 |
int m = 0; |
385 |
for (int i=0; i<16; i++) { |
386 |
if ((c = *q++) == 0xa0) { |
387 |
if (m) |
388 |
*p++ = ' '; // Replace all 0xa0 by spaces |
389 |
else |
390 |
m = *p++ = '\"'; // But the first by a '"' |
391 |
} else |
392 |
*p++ = c; |
393 |
} |
394 |
if (m) |
395 |
*p++ = ' '; |
396 |
else |
397 |
*p++ = '\"'; // No 0xa0, then append a space |
398 |
|
399 |
// Open files are marked by '*' |
400 |
if (de->type & 0x80) |
401 |
*p++ = ' '; |
402 |
else |
403 |
*p++ = '*'; |
404 |
|
405 |
// File type |
406 |
*p++ = type_char_1[de->type & 0x0f]; |
407 |
*p++ = type_char_2[de->type & 0x0f]; |
408 |
*p++ = type_char_3[de->type & 0x0f]; |
409 |
|
410 |
// Protected files are marked by '<' |
411 |
if (de->type & 0x40) |
412 |
*p++ = '<'; |
413 |
else |
414 |
*p++ = ' '; |
415 |
|
416 |
// Appropriate number of spaces at the end |
417 |
*p++ = ' '; |
418 |
if (n >= 10) *p++ = ' '; |
419 |
if (n >= 100) *p++ = ' '; |
420 |
*p++ = 0; |
421 |
} |
422 |
} |
423 |
} |
424 |
|
425 |
// Final line, count number of free blocks |
426 |
int n = 0; |
427 |
for (int i=0; i<35; i++) { |
428 |
if (i != 17) // exclude directory track |
429 |
n += bam->bitmap[i*4]; |
430 |
} |
431 |
|
432 |
*p++ = 0x01; // Dummy line link |
433 |
*p++ = 0x01; |
434 |
*p++ = n & 0xff; // Number of free blocks as line number |
435 |
*p++ = (n >> 8) & 0xff; |
436 |
|
437 |
*p++ = 'B'; |
438 |
*p++ = 'L'; |
439 |
*p++ = 'O'; |
440 |
*p++ = 'C'; |
441 |
*p++ = 'K'; |
442 |
*p++ = 'S'; |
443 |
*p++ = ' '; |
444 |
*p++ = 'F'; |
445 |
*p++ = 'R'; |
446 |
*p++ = 'E'; |
447 |
*p++ = 'E'; |
448 |
*p++ = '.'; |
449 |
|
450 |
memset(p, ' ', 13); |
451 |
p += 13; |
452 |
|
453 |
*p++ = 0; |
454 |
*p++ = 0; |
455 |
*p++ = 0; |
456 |
|
457 |
buf_len[0] = p - chan_buf[0]; |
458 |
|
459 |
return ST_OK; |
460 |
} |
461 |
|
462 |
|
463 |
/* |
464 |
* Open channel for direct buffer access |
465 |
*/ |
466 |
|
467 |
uint8 D64Drive::open_direct(int channel, const uint8 *name) |
468 |
{ |
469 |
int buf = -1; |
470 |
|
471 |
if (name[1] == 0) |
472 |
buf = alloc_buffer(-1); |
473 |
else |
474 |
if ((name[1] >= '0') && (name[1] <= '3') && (name[2] == 0)) |
475 |
buf = alloc_buffer(name[1] - '0'); |
476 |
|
477 |
if (buf == -1) { |
478 |
set_error(ERR_NOCHANNEL); |
479 |
return ST_OK; |
480 |
} |
481 |
|
482 |
// The buffers are in the 1541 RAM at $300 and are 256 bytes each |
483 |
chan_buf[channel] = buf_ptr[channel] = ram + 0x300 + (buf << 8); |
484 |
chan_mode[channel] = CHMOD_DIRECT; |
485 |
chan_buf_num[channel] = buf; |
486 |
|
487 |
// Store actual buffer number in buffer |
488 |
*chan_buf[channel] = buf + '0'; |
489 |
buf_len[channel] = 1; |
490 |
|
491 |
return ST_OK; |
492 |
} |
493 |
|
494 |
|
495 |
/* |
496 |
* Close channel |
497 |
*/ |
498 |
|
499 |
uint8 D64Drive::Close(int channel) |
500 |
{ |
501 |
if (channel == 15) { |
502 |
close_all_channels(); |
503 |
return ST_OK; |
504 |
} |
505 |
|
506 |
switch (chan_mode[channel]) { |
507 |
case CHMOD_FREE: |
508 |
break; |
509 |
|
510 |
case CHMOD_DIRECT: |
511 |
free_buffer(chan_buf_num[channel]); |
512 |
chan_buf[channel] = NULL; |
513 |
chan_mode[channel] = CHMOD_FREE; |
514 |
break; |
515 |
|
516 |
default: |
517 |
delete[] chan_buf[channel]; |
518 |
chan_buf[channel] = NULL; |
519 |
chan_mode[channel] = CHMOD_FREE; |
520 |
break; |
521 |
} |
522 |
|
523 |
return ST_OK; |
524 |
} |
525 |
|
526 |
|
527 |
/* |
528 |
* Close all channels |
529 |
*/ |
530 |
|
531 |
void D64Drive::close_all_channels() |
532 |
{ |
533 |
for (int i=0; i<15; i++) |
534 |
Close(i); |
535 |
|
536 |
cmd_len = 0; |
537 |
} |
538 |
|
539 |
|
540 |
/* |
541 |
* Read from channel |
542 |
*/ |
543 |
|
544 |
uint8 D64Drive::Read(int channel, uint8 *byte) |
545 |
{ |
546 |
switch (chan_mode[channel]) { |
547 |
case CHMOD_COMMAND: |
548 |
*byte = *error_ptr++; |
549 |
if (--error_len) |
550 |
return ST_OK; |
551 |
else { |
552 |
set_error(ERR_OK); |
553 |
return ST_EOF; |
554 |
} |
555 |
break; |
556 |
|
557 |
case CHMOD_FILE: |
558 |
// Read next block if necessary |
559 |
if (chan_buf[channel][0] && !buf_len[channel]) { |
560 |
if (!read_sector(chan_buf[channel][0], chan_buf[channel][1], chan_buf[channel])) |
561 |
return ST_READ_TIMEOUT; |
562 |
buf_ptr[channel] = chan_buf[channel] + 2; |
563 |
|
564 |
// Determine block length |
565 |
buf_len[channel] = chan_buf[channel][0] ? 254 : (uint8)chan_buf[channel][1]-1; |
566 |
} |
567 |
|
568 |
if (buf_len[channel] > 0) { |
569 |
*byte = *buf_ptr[channel]++; |
570 |
if (!--buf_len[channel] && !chan_buf[channel][0]) |
571 |
return ST_EOF; |
572 |
else |
573 |
return ST_OK; |
574 |
} else |
575 |
return ST_READ_TIMEOUT; |
576 |
break; |
577 |
|
578 |
case CHMOD_DIRECTORY: |
579 |
case CHMOD_DIRECT: |
580 |
if (buf_len[channel] > 0) { |
581 |
*byte = *buf_ptr[channel]++; |
582 |
if (--buf_len[channel]) |
583 |
return ST_OK; |
584 |
else |
585 |
return ST_EOF; |
586 |
} else |
587 |
return ST_READ_TIMEOUT; |
588 |
break; |
589 |
} |
590 |
return ST_READ_TIMEOUT; |
591 |
} |
592 |
|
593 |
|
594 |
/* |
595 |
* Write byte to channel |
596 |
*/ |
597 |
|
598 |
uint8 D64Drive::Write(int channel, uint8 byte, bool eoi) |
599 |
{ |
600 |
switch (chan_mode[channel]) { |
601 |
case CHMOD_FREE: |
602 |
set_error(ERR_FILENOTOPEN); |
603 |
break; |
604 |
|
605 |
case CHMOD_COMMAND: |
606 |
// Collect characters and execute command on EOI |
607 |
if (cmd_len >= 58) |
608 |
return ST_TIMEOUT; |
609 |
|
610 |
cmd_buf[cmd_len++] = byte; |
611 |
|
612 |
if (eoi) { |
613 |
execute_cmd(cmd_buf, cmd_len); |
614 |
cmd_len = 0; |
615 |
} |
616 |
return ST_OK; |
617 |
|
618 |
case CHMOD_DIRECTORY: |
619 |
set_error(ERR_WRITEFILEOPEN); |
620 |
break; |
621 |
} |
622 |
return ST_TIMEOUT; |
623 |
} |
624 |
|
625 |
|
626 |
/* |
627 |
* Execute command string |
628 |
*/ |
629 |
|
630 |
// BLOCK-READ:channel,0,track,sector |
631 |
void D64Drive::block_read_cmd(int channel, int track, int sector, bool user_cmd) |
632 |
{ |
633 |
if (channel >= 16 || chan_mode[channel] != CHMOD_DIRECT) { |
634 |
set_error(ERR_NOCHANNEL); |
635 |
return; |
636 |
} |
637 |
read_sector(track, sector, chan_buf[channel]); |
638 |
if (user_cmd) { |
639 |
buf_len[channel] = 256; |
640 |
buf_ptr[channel] = chan_buf[channel]; |
641 |
} else { |
642 |
buf_len[channel] = chan_buf[channel][0]; |
643 |
buf_ptr[channel] = chan_buf[channel] + 1; |
644 |
} |
645 |
} |
646 |
|
647 |
// BUFFER-POINTER:channel,pos |
648 |
void D64Drive::buffer_pointer_cmd(int channel, int pos) |
649 |
{ |
650 |
if (channel >= 16 || chan_mode[channel] != CHMOD_DIRECT) { |
651 |
set_error(ERR_NOCHANNEL); |
652 |
return; |
653 |
} |
654 |
buf_ptr[channel] = chan_buf[channel] + pos; |
655 |
buf_len[channel] = 256 - pos; |
656 |
} |
657 |
|
658 |
// M-R<adr low><adr high>[<number>] |
659 |
void D64Drive::mem_read_cmd(uint16 adr, uint8 len) |
660 |
{ |
661 |
error_len = len; |
662 |
if (adr >= 0x300 && adr < 0x1000) { |
663 |
// Read from RAM |
664 |
error_ptr = (char *)ram + (adr & 0x7ff); |
665 |
} else { |
666 |
unsupp_cmd(); |
667 |
memset(error_buf, 0, len); |
668 |
error_ptr = error_buf; |
669 |
} |
670 |
} |
671 |
|
672 |
// M-W<adr low><adr high><number><data...> |
673 |
void D64Drive::mem_write_cmd(uint16 adr, uint8 len, uint8 *p) |
674 |
{ |
675 |
while (len) { |
676 |
if (adr >= 0x300 && adr < 0x1000) { |
677 |
// Write to RAM |
678 |
ram[adr & 0x7ff] = *p; |
679 |
} else if (adr < 0xc000) { |
680 |
unsupp_cmd(); |
681 |
return; |
682 |
} |
683 |
len--; adr++; p++; |
684 |
} |
685 |
} |
686 |
|
687 |
// INITIALIZE |
688 |
void D64Drive::initialize_cmd(void) |
689 |
{ |
690 |
// Close all channels and re-read BAM |
691 |
close_all_channels(); |
692 |
read_sector(18, 0, (uint8 *)bam); |
693 |
} |
694 |
|
695 |
|
696 |
/* |
697 |
* Reset drive |
698 |
*/ |
699 |
|
700 |
void D64Drive::Reset(void) |
701 |
{ |
702 |
close_all_channels(); |
703 |
|
704 |
read_sector(18, 0, (uint8 *)bam); |
705 |
|
706 |
cmd_len = 0; |
707 |
for (int i=0; i<4; i++) |
708 |
buf_free[i] = true; |
709 |
|
710 |
set_error(ERR_STARTUP); |
711 |
} |
712 |
|
713 |
|
714 |
/* |
715 |
* Allocate floppy buffer |
716 |
* -> Desired buffer number or -1 |
717 |
* <- Allocated buffer number or -1 |
718 |
*/ |
719 |
|
720 |
int D64Drive::alloc_buffer(int want) |
721 |
{ |
722 |
if (want == -1) { |
723 |
for (want=3; want>=0; want--) |
724 |
if (buf_free[want]) { |
725 |
buf_free[want] = false; |
726 |
return want; |
727 |
} |
728 |
return -1; |
729 |
} |
730 |
|
731 |
if (want < 4) |
732 |
if (buf_free[want]) { |
733 |
buf_free[want] = false; |
734 |
return want; |
735 |
} else |
736 |
return -1; |
737 |
else |
738 |
return -1; |
739 |
} |
740 |
|
741 |
|
742 |
/* |
743 |
* Free floppy buffer |
744 |
*/ |
745 |
|
746 |
void D64Drive::free_buffer(int buf) |
747 |
{ |
748 |
buf_free[buf] = true; |
749 |
} |
750 |
|
751 |
|
752 |
/* |
753 |
* Read sector (256 bytes) |
754 |
* true: success, false: error |
755 |
*/ |
756 |
|
757 |
bool D64Drive::read_sector(int track, int sector, uint8 *buffer) |
758 |
{ |
759 |
int offset; |
760 |
|
761 |
// Convert track/sector to byte offset in file |
762 |
if ((offset = offset_from_ts(track, sector)) < 0) { |
763 |
set_error(ERR_ILLEGALTS); |
764 |
return false; |
765 |
} |
766 |
|
767 |
if (the_file == NULL) { |
768 |
set_error(ERR_NOTREADY); |
769 |
return false; |
770 |
} |
771 |
|
772 |
#ifdef AMIGA |
773 |
if (offset != ftell(the_file)) |
774 |
fseek(the_file, offset + image_header, SEEK_SET); |
775 |
#else |
776 |
fseek(the_file, offset + image_header, SEEK_SET); |
777 |
#endif |
778 |
fread(buffer, 256, 1, the_file); |
779 |
return true; |
780 |
} |
781 |
|
782 |
|
783 |
/* |
784 |
* Convert track/sector to offset |
785 |
*/ |
786 |
|
787 |
const int num_sectors[41] = { |
788 |
0, |
789 |
21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21, |
790 |
19,19,19,19,19,19,19, |
791 |
18,18,18,18,18,18, |
792 |
17,17,17,17,17, |
793 |
17,17,17,17,17 // Tracks 36..40 |
794 |
}; |
795 |
|
796 |
const int sector_offset[41] = { |
797 |
0, |
798 |
0,21,42,63,84,105,126,147,168,189,210,231,252,273,294,315,336, |
799 |
357,376,395,414,433,452,471, |
800 |
490,508,526,544,562,580, |
801 |
598,615,632,649,666, |
802 |
683,700,717,734,751 // Tracks 36..40 |
803 |
}; |
804 |
|
805 |
int D64Drive::offset_from_ts(int track, int sector) |
806 |
{ |
807 |
if ((track < 1) || (track > NUM_TRACKS) || |
808 |
(sector < 0) || (sector >= num_sectors[track])) |
809 |
return -1; |
810 |
|
811 |
return (sector_offset[track] + sector) << 8; |
812 |
} |