1 |
/* |
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* 1541d64.cpp - 1541 emulation in .d64 file |
3 |
* |
4 |
* Frodo (C) 1994-1997,2002-2003 Christian Bauer |
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* |
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* 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 |
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* (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 |
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*/ |
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|
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/* |
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* Incompatibilities: |
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* ------------------ |
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* |
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* - Only read accesses possible |
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* - Not all commands implemented |
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* - The .d64 error info is read, but unused |
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*/ |
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|
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#include "sysdeps.h" |
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|
32 |
#include "1541d64.h" |
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#include "IEC.h" |
34 |
#include "Prefs.h" |
35 |
|
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|
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// Channel modes (IRC users listen up :-) |
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enum { |
39 |
CHMOD_FREE, // Channel free |
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CHMOD_COMMAND, // Command/error channel |
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CHMOD_DIRECTORY, // Reading directory |
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CHMOD_FILE, // Sequential file open |
43 |
CHMOD_DIRECT // Direct buffer access ('#') |
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}; |
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|
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// Access modes |
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enum { |
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FMODE_READ, FMODE_WRITE, FMODE_APPEND |
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}; |
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|
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// File types |
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enum { |
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FTYPE_PRG, FTYPE_SEQ, FTYPE_USR, FTYPE_REL |
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}; |
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|
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// Number of tracks/sectors |
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const int NUM_TRACKS = 35; |
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const int NUM_SECTORS = 683; |
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|
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// Prototypes |
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static bool match(uint8 *p, uint8 *n); |
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|
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|
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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) |
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{ |
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the_file = NULL; |
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ram = NULL; |
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|
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Ready = false; |
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strcpy(orig_d64_name, filepath); |
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for (int i=0; i<=14; i++) { |
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chan_mode[i] = CHMOD_FREE; |
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chan_buf[i] = NULL; |
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} |
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chan_mode[15] = CHMOD_COMMAND; |
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|
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// Open .d64 file |
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open_close_d64_file(filepath); |
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if (the_file != NULL) { |
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|
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// Allocate 1541 RAM |
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ram = new uint8[0x800]; |
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bam = (BAM *)(ram + 0x700); |
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|
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Reset(); |
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Ready = true; |
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} |
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} |
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|
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|
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/* |
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* Destructor |
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*/ |
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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; |
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} |
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|
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|
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/* |
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* Open/close the .d64 file |
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*/ |
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|
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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 |
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if (the_file != NULL) { |
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close_all_channels(); |
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fclose(the_file); |
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the_file = NULL; |
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} |
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|
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// Open new .d64 file |
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if (d64name[0]) { |
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if ((the_file = fopen(d64name, "rb")) != NULL) { |
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|
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// Check length |
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fseek(the_file, 0, SEEK_END); |
131 |
if ((size = ftell(the_file)) < NUM_SECTORS * 256) { |
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fclose(the_file); |
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the_file = NULL; |
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return; |
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} |
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|
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// x64 image? |
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rewind(the_file); |
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fread(&magic, 4, 1, the_file); |
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if (magic[0] == 0x43 && magic[1] == 0x15 && magic[2] == 0x41 && magic[3] == 0x64) |
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image_header = 64; |
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else |
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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); |
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|
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// Load sector error info from .d64 file, if present |
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if (!image_header && size == NUM_SECTORS * 257) { |
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fseek(the_file, NUM_SECTORS * 256, SEEK_SET); |
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fread(&error_info, NUM_SECTORS, 1, the_file); |
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} |
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} |
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} |
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} |
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|
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|
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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, char *filename) |
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{ |
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set_error(ERR_OK); |
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|
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// Channel 15: execute file name as command |
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if (channel == 15) { |
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execute_command(filename); |
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return ST_OK; |
170 |
} |
171 |
|
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if (chan_mode[channel] != CHMOD_FREE) { |
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set_error(ERR_NOCHANNEL); |
174 |
return ST_OK; |
175 |
} |
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|
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if (filename[0] == '$') |
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if (channel) |
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return open_file_ts(channel, 18, 0); |
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else |
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return open_directory(filename+1); |
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|
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if (filename[0] == '#') |
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return open_direct(channel, filename); |
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|
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return open_file(channel, filename); |
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} |
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|
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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, char *filename) |
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{ |
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char plainname[256]; |
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int filemode = FMODE_READ; |
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int filetype = FTYPE_PRG; |
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int track, sector; |
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|
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convert_filename(filename, plainname, &filemode, &filetype); |
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|
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// Channel 0 is READ PRG, channel 1 is WRITE PRG |
204 |
if (!channel) { |
205 |
filemode = FMODE_READ; |
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filetype = FTYPE_PRG; |
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} |
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if (channel == 1) { |
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filemode = FMODE_WRITE; |
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filetype = FTYPE_PRG; |
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} |
212 |
|
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// Allow only read accesses |
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if (filemode != FMODE_READ) { |
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set_error(ERR_WRITEPROTECT); |
216 |
return ST_OK; |
217 |
} |
218 |
|
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// Find file in directory and open it |
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if (find_file(plainname, &track, §or)) |
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return open_file_ts(channel, track, sector); |
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else |
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set_error(ERR_FILENOTFOUND); |
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|
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return ST_OK; |
226 |
} |
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|
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|
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/* |
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* Analyze file name, get access mode and type |
231 |
*/ |
232 |
|
233 |
void D64Drive::convert_filename(char *srcname, char *destname, int *filemode, int *filetype) |
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{ |
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char *p; |
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|
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// Search for ':', p points to first character after ':' |
238 |
if ((p = strchr(srcname, ':')) != NULL) |
239 |
p++; |
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else |
241 |
p = srcname; |
242 |
|
243 |
// Remaining string -> destname |
244 |
strncpy(destname, p, NAMEBUF_LENGTH); |
245 |
|
246 |
// Search for ',' |
247 |
p = destname; |
248 |
while (*p && (*p != ',')) p++; |
249 |
|
250 |
// Look for mode parameters seperated by ',' |
251 |
p = destname; |
252 |
while ((p = strchr(p, ',')) != NULL) { |
253 |
|
254 |
// Cut string after the first ',' |
255 |
*p++ = 0; |
256 |
|
257 |
switch (*p) { |
258 |
case 'P': |
259 |
*filetype = FTYPE_PRG; |
260 |
break; |
261 |
case 'S': |
262 |
*filetype = FTYPE_SEQ; |
263 |
break; |
264 |
case 'U': |
265 |
*filetype = FTYPE_USR; |
266 |
break; |
267 |
case 'L': |
268 |
*filetype = FTYPE_REL; |
269 |
break; |
270 |
case 'R': |
271 |
*filemode = FMODE_READ; |
272 |
break; |
273 |
case 'W': |
274 |
*filemode = FMODE_WRITE; |
275 |
break; |
276 |
case 'A': |
277 |
*filemode = FMODE_APPEND; |
278 |
break; |
279 |
} |
280 |
} |
281 |
} |
282 |
|
283 |
|
284 |
/* |
285 |
* Search file in directory, find first track and sector |
286 |
* false: not found, true: found |
287 |
*/ |
288 |
|
289 |
bool D64Drive::find_file(char *filename, int *track, int *sector) |
290 |
{ |
291 |
int i, j; |
292 |
uint8 *p, *q; |
293 |
DirEntry *de; |
294 |
|
295 |
// Scan all directory blocks |
296 |
dir.next_track = bam->dir_track; |
297 |
dir.next_sector = bam->dir_sector; |
298 |
|
299 |
while (dir.next_track) { |
300 |
if (!read_sector(dir.next_track, dir.next_sector, (uint8 *) &dir.next_track)) |
301 |
return false; |
302 |
|
303 |
// Scan all 8 entries of a block |
304 |
for (j=0; j<8; j++) { |
305 |
de = &dir.entry[j]; |
306 |
*track = de->track; |
307 |
*sector = de->sector; |
308 |
|
309 |
if (de->type) { |
310 |
p = (uint8 *)filename; |
311 |
q = de->name; |
312 |
for (i=0; i<16 && *p; i++, p++, q++) { |
313 |
if (*p == '*') // Wildcard '*' matches all following characters |
314 |
return true; |
315 |
if (*p != *q) { |
316 |
if (*p != '?') goto next_entry; // Wildcard '?' matches single character |
317 |
if (*q == 0xa0) goto next_entry; |
318 |
} |
319 |
} |
320 |
|
321 |
if (i == 16 || *q == 0xa0) |
322 |
return true; |
323 |
} |
324 |
next_entry: ; |
325 |
} |
326 |
} |
327 |
|
328 |
return false; |
329 |
} |
330 |
|
331 |
|
332 |
/* |
333 |
* Open file given track/sector of first block |
334 |
*/ |
335 |
|
336 |
uint8 D64Drive::open_file_ts(int channel, int track, int sector) |
337 |
{ |
338 |
chan_buf[channel] = new uint8[256]; |
339 |
chan_mode[channel] = CHMOD_FILE; |
340 |
|
341 |
// On the next call to Read, the first block will be read |
342 |
chan_buf[channel][0] = track; |
343 |
chan_buf[channel][1] = sector; |
344 |
buf_len[channel] = 0; |
345 |
|
346 |
return ST_OK; |
347 |
} |
348 |
|
349 |
|
350 |
/* |
351 |
* Prepare directory as BASIC program (channel 0) |
352 |
*/ |
353 |
|
354 |
const char type_char_1[] = "DSPUREERSELQGRL?"; |
355 |
const char type_char_2[] = "EERSELQGRL??????"; |
356 |
const char type_char_3[] = "LQGRL???????????"; |
357 |
|
358 |
// Return true if name 'n' matches pattern 'p' |
359 |
static bool match(uint8 *p, uint8 *n) |
360 |
{ |
361 |
if (!*p) // Null pattern matches everything |
362 |
return true; |
363 |
|
364 |
do { |
365 |
if (*p == '*') // Wildcard '*' matches all following characters |
366 |
return true; |
367 |
if ((*p != *n) && (*p != '?')) // Wildcard '?' matches single character |
368 |
return false; |
369 |
p++; n++; |
370 |
} while (*p); |
371 |
|
372 |
return *n == 0xa0; |
373 |
} |
374 |
|
375 |
uint8 D64Drive::open_directory(char *pattern) |
376 |
{ |
377 |
int i, j, n, m; |
378 |
uint8 *p, *q; |
379 |
DirEntry *de; |
380 |
uint8 c; |
381 |
char *tmppat; |
382 |
|
383 |
// Special treatment for "$0" |
384 |
if (pattern[0] == '0' && pattern[1] == 0) |
385 |
pattern += 1; |
386 |
|
387 |
// Skip everything before the ':' in the pattern |
388 |
if ((tmppat = strchr(pattern, ':')) != NULL) |
389 |
pattern = tmppat + 1; |
390 |
|
391 |
p = buf_ptr[0] = chan_buf[0] = new uint8[8192]; |
392 |
chan_mode[0] = CHMOD_DIRECTORY; |
393 |
|
394 |
// Create directory title |
395 |
*p++ = 0x01; // Load address $0401 (from PET days :-) |
396 |
*p++ = 0x04; |
397 |
*p++ = 0x01; // Dummy line link |
398 |
*p++ = 0x01; |
399 |
*p++ = 0; // Drive number (0) as line number |
400 |
*p++ = 0; |
401 |
*p++ = 0x12; // RVS ON |
402 |
*p++ = '\"'; |
403 |
|
404 |
q = bam->disk_name; |
405 |
for (i=0; i<23; i++) { |
406 |
if ((c = *q++) == 0xa0) |
407 |
*p++ = ' '; // Replace 0xa0 by space |
408 |
else |
409 |
*p++ = c; |
410 |
} |
411 |
*(p-7) = '\"'; |
412 |
*p++ = 0; |
413 |
|
414 |
// Scan all directory blocks |
415 |
dir.next_track = bam->dir_track; |
416 |
dir.next_sector = bam->dir_sector; |
417 |
|
418 |
while (dir.next_track) { |
419 |
if (!read_sector(dir.next_track, dir.next_sector, (uint8 *) &dir.next_track)) |
420 |
return ST_OK; |
421 |
|
422 |
// Scan all 8 entries of a block |
423 |
for (j=0; j<8; j++) { |
424 |
de = &dir.entry[j]; |
425 |
|
426 |
if (de->type && match((uint8 *)pattern, de->name)) { |
427 |
*p++ = 0x01; // Dummy line link |
428 |
*p++ = 0x01; |
429 |
|
430 |
*p++ = de->num_blocks_l; // Line number |
431 |
*p++ = de->num_blocks_h; |
432 |
|
433 |
*p++ = ' '; |
434 |
n = (de->num_blocks_h << 8) + de->num_blocks_l; |
435 |
if (n<10) *p++ = ' '; |
436 |
if (n<100) *p++ = ' '; |
437 |
|
438 |
*p++ = '\"'; |
439 |
q = de->name; |
440 |
m = 0; |
441 |
for (i=0; i<16; i++) { |
442 |
if ((c = *q++) == 0xa0) { |
443 |
if (m) |
444 |
*p++ = ' '; // Replace all 0xa0 by spaces |
445 |
else |
446 |
m = *p++ = '\"'; // But the first by a '"' |
447 |
} else |
448 |
*p++ = c; |
449 |
} |
450 |
if (m) |
451 |
*p++ = ' '; |
452 |
else |
453 |
*p++ = '\"'; // No 0xa0, then append a space |
454 |
|
455 |
if (de->type & 0x80) |
456 |
*p++ = ' '; |
457 |
else |
458 |
*p++ = '*'; |
459 |
|
460 |
*p++ = type_char_1[de->type & 0x0f]; |
461 |
*p++ = type_char_2[de->type & 0x0f]; |
462 |
*p++ = type_char_3[de->type & 0x0f]; |
463 |
|
464 |
if (de->type & 0x40) |
465 |
*p++ = '<'; |
466 |
else |
467 |
*p++ = ' '; |
468 |
|
469 |
*p++ = ' '; |
470 |
if (n >= 10) *p++ = ' '; |
471 |
if (n >= 100) *p++ = ' '; |
472 |
*p++ = 0; |
473 |
} |
474 |
} |
475 |
} |
476 |
|
477 |
// Final line |
478 |
q = p; |
479 |
for (i=0; i<29; i++) |
480 |
*q++ = ' '; |
481 |
|
482 |
n = 0; |
483 |
for (i=0; i<35; i++) |
484 |
n += bam->bitmap[i*4]; |
485 |
|
486 |
*p++ = 0x01; // Dummy line link |
487 |
*p++ = 0x01; |
488 |
*p++ = n & 0xff; // Number of free blocks as line number |
489 |
*p++ = (n >> 8) & 0xff; |
490 |
|
491 |
*p++ = 'B'; |
492 |
*p++ = 'L'; |
493 |
*p++ = 'O'; |
494 |
*p++ = 'C'; |
495 |
*p++ = 'K'; |
496 |
*p++ = 'S'; |
497 |
*p++ = ' '; |
498 |
*p++ = 'F'; |
499 |
*p++ = 'R'; |
500 |
*p++ = 'E'; |
501 |
*p++ = 'E'; |
502 |
*p++ = '.'; |
503 |
|
504 |
p = q; |
505 |
*p++ = 0; |
506 |
*p++ = 0; |
507 |
*p++ = 0; |
508 |
|
509 |
buf_len[0] = p - chan_buf[0]; |
510 |
|
511 |
return ST_OK; |
512 |
} |
513 |
|
514 |
|
515 |
/* |
516 |
* Open channel for direct buffer access |
517 |
*/ |
518 |
|
519 |
uint8 D64Drive::open_direct(int channel, char *filename) |
520 |
{ |
521 |
int buf = -1; |
522 |
|
523 |
if (filename[1] == 0) |
524 |
buf = alloc_buffer(-1); |
525 |
else |
526 |
if ((filename[1] >= '0') && (filename[1] <= '3') && (filename[2] == 0)) |
527 |
buf = alloc_buffer(filename[1] - '0'); |
528 |
|
529 |
if (buf == -1) { |
530 |
set_error(ERR_NOCHANNEL); |
531 |
return ST_OK; |
532 |
} |
533 |
|
534 |
// The buffers are in the 1541 RAM at $300 and are 256 bytes each |
535 |
chan_buf[channel] = buf_ptr[channel] = ram + 0x300 + (buf << 8); |
536 |
chan_mode[channel] = CHMOD_DIRECT; |
537 |
chan_buf_num[channel] = buf; |
538 |
|
539 |
// Store actual buffer number in buffer |
540 |
*chan_buf[channel] = buf + '0'; |
541 |
buf_len[channel] = 1; |
542 |
|
543 |
return ST_OK; |
544 |
} |
545 |
|
546 |
|
547 |
/* |
548 |
* Close channel |
549 |
*/ |
550 |
|
551 |
uint8 D64Drive::Close(int channel) |
552 |
{ |
553 |
if (channel == 15) { |
554 |
close_all_channels(); |
555 |
return ST_OK; |
556 |
} |
557 |
|
558 |
switch (chan_mode[channel]) { |
559 |
case CHMOD_FREE: |
560 |
break; |
561 |
|
562 |
case CHMOD_DIRECT: |
563 |
free_buffer(chan_buf_num[channel]); |
564 |
chan_buf[channel] = NULL; |
565 |
chan_mode[channel] = CHMOD_FREE; |
566 |
break; |
567 |
|
568 |
default: |
569 |
delete[] chan_buf[channel]; |
570 |
chan_buf[channel] = NULL; |
571 |
chan_mode[channel] = CHMOD_FREE; |
572 |
break; |
573 |
} |
574 |
|
575 |
return ST_OK; |
576 |
} |
577 |
|
578 |
|
579 |
/* |
580 |
* Close all channels |
581 |
*/ |
582 |
|
583 |
void D64Drive::close_all_channels() |
584 |
{ |
585 |
for (int i=0; i<15; i++) |
586 |
Close(i); |
587 |
|
588 |
cmd_len = 0; |
589 |
} |
590 |
|
591 |
|
592 |
/* |
593 |
* Read from channel |
594 |
*/ |
595 |
|
596 |
uint8 D64Drive::Read(int channel, uint8 *byte) |
597 |
{ |
598 |
switch (chan_mode[channel]) { |
599 |
case CHMOD_COMMAND: |
600 |
*byte = *error_ptr++; |
601 |
if (--error_len) |
602 |
return ST_OK; |
603 |
else { |
604 |
set_error(ERR_OK); |
605 |
return ST_EOF; |
606 |
} |
607 |
break; |
608 |
|
609 |
case CHMOD_FILE: |
610 |
// Read next block if necessary |
611 |
if (chan_buf[channel][0] && !buf_len[channel]) { |
612 |
if (!read_sector(chan_buf[channel][0], chan_buf[channel][1], chan_buf[channel])) |
613 |
return ST_READ_TIMEOUT; |
614 |
buf_ptr[channel] = chan_buf[channel] + 2; |
615 |
|
616 |
// Determine block length |
617 |
buf_len[channel] = chan_buf[channel][0] ? 254 : (uint8)chan_buf[channel][1]-1; |
618 |
} |
619 |
|
620 |
if (buf_len[channel] > 0) { |
621 |
*byte = *buf_ptr[channel]++; |
622 |
if (!--buf_len[channel] && !chan_buf[channel][0]) |
623 |
return ST_EOF; |
624 |
else |
625 |
return ST_OK; |
626 |
} else |
627 |
return ST_READ_TIMEOUT; |
628 |
break; |
629 |
|
630 |
case CHMOD_DIRECTORY: |
631 |
case CHMOD_DIRECT: |
632 |
if (buf_len[channel] > 0) { |
633 |
*byte = *buf_ptr[channel]++; |
634 |
if (--buf_len[channel]) |
635 |
return ST_OK; |
636 |
else |
637 |
return ST_EOF; |
638 |
} else |
639 |
return ST_READ_TIMEOUT; |
640 |
break; |
641 |
} |
642 |
return ST_READ_TIMEOUT; |
643 |
} |
644 |
|
645 |
|
646 |
/* |
647 |
* Write byte to channel |
648 |
*/ |
649 |
|
650 |
uint8 D64Drive::Write(int channel, uint8 byte, bool eoi) |
651 |
{ |
652 |
switch (chan_mode[channel]) { |
653 |
case CHMOD_FREE: |
654 |
set_error(ERR_FILENOTOPEN); |
655 |
break; |
656 |
|
657 |
case CHMOD_COMMAND: |
658 |
// Collect characters and execute command on EOI |
659 |
if (cmd_len >= 40) |
660 |
return ST_TIMEOUT; |
661 |
|
662 |
cmd_buffer[cmd_len++] = byte; |
663 |
|
664 |
if (eoi) { |
665 |
cmd_buffer[cmd_len++] = 0; |
666 |
cmd_len = 0; |
667 |
execute_command(cmd_buffer); |
668 |
} |
669 |
return ST_OK; |
670 |
|
671 |
case CHMOD_DIRECTORY: |
672 |
set_error(ERR_WRITEFILEOPEN); |
673 |
break; |
674 |
} |
675 |
return ST_TIMEOUT; |
676 |
} |
677 |
|
678 |
|
679 |
/* |
680 |
* Execute command string |
681 |
*/ |
682 |
|
683 |
void D64Drive::execute_command(char *command) |
684 |
{ |
685 |
uint16 adr; |
686 |
int len; |
687 |
|
688 |
switch (command[0]) { |
689 |
case 'B': |
690 |
if (command[1] != '-') |
691 |
set_error(ERR_SYNTAX30); |
692 |
else |
693 |
switch (command[2]) { |
694 |
case 'R': |
695 |
block_read_cmd(&command[3]); |
696 |
break; |
697 |
|
698 |
case 'P': |
699 |
buffer_ptr_cmd(&command[3]); |
700 |
break; |
701 |
|
702 |
case 'A': |
703 |
case 'F': |
704 |
case 'W': |
705 |
set_error(ERR_WRITEPROTECT); |
706 |
break; |
707 |
|
708 |
default: |
709 |
set_error(ERR_SYNTAX30); |
710 |
break; |
711 |
} |
712 |
break; |
713 |
|
714 |
case 'M': |
715 |
if (command[1] != '-') |
716 |
set_error(ERR_SYNTAX30); |
717 |
else |
718 |
switch (command[2]) { |
719 |
case 'R': |
720 |
adr = ((uint8)command[4] << 8) | ((uint8)command[3]); |
721 |
error_ptr = (char *)(ram + (adr & 0x07ff)); |
722 |
if (!(error_len = (uint8)command[5])) |
723 |
error_len = 1; |
724 |
break; |
725 |
|
726 |
case 'W': |
727 |
adr = ((uint8)command[4] << 8) | ((uint8)command[3]); |
728 |
len = (uint8)command[5]; |
729 |
for (int i=0; i<len; i++) |
730 |
ram[adr+i] = (uint8)command[i+6]; |
731 |
break; |
732 |
|
733 |
default: |
734 |
set_error(ERR_SYNTAX30); |
735 |
} |
736 |
break; |
737 |
|
738 |
case 'I': |
739 |
close_all_channels(); |
740 |
read_sector(18, 0, (uint8 *)bam); |
741 |
set_error(ERR_OK); |
742 |
break; |
743 |
|
744 |
case 'U': |
745 |
switch (command[1] & 0x0f) { |
746 |
case 1: // U1/UA: Block-Read |
747 |
block_read_cmd(&command[2]); |
748 |
break; |
749 |
|
750 |
case 2: // U2/UB: Block-Write |
751 |
set_error(ERR_WRITEPROTECT); |
752 |
break; |
753 |
|
754 |
case 10: // U:/UJ: Reset |
755 |
Reset(); |
756 |
break; |
757 |
|
758 |
default: |
759 |
set_error(ERR_SYNTAX30); |
760 |
break; |
761 |
} |
762 |
break; |
763 |
|
764 |
case 'G': |
765 |
if (command[1] != ':') |
766 |
set_error(ERR_SYNTAX30); |
767 |
else |
768 |
chd64_cmd(&command[2]); |
769 |
break; |
770 |
|
771 |
case 'C': |
772 |
case 'N': |
773 |
case 'R': |
774 |
case 'S': |
775 |
case 'V': |
776 |
set_error(ERR_WRITEPROTECT); |
777 |
break; |
778 |
|
779 |
default: |
780 |
set_error(ERR_SYNTAX30); |
781 |
break; |
782 |
} |
783 |
} |
784 |
|
785 |
|
786 |
/* |
787 |
* Execute B-R command |
788 |
*/ |
789 |
|
790 |
void D64Drive::block_read_cmd(char *command) |
791 |
{ |
792 |
int channel, drvnum, track, sector; |
793 |
|
794 |
if (parse_bcmd(command, &channel, &drvnum, &track, §or)) { |
795 |
if (chan_mode[channel] == CHMOD_DIRECT) { |
796 |
read_sector(track, sector, buf_ptr[channel] = chan_buf[channel]); |
797 |
buf_len[channel] = 256; |
798 |
set_error(ERR_OK); |
799 |
} else |
800 |
set_error(ERR_NOCHANNEL); |
801 |
} else |
802 |
set_error(ERR_SYNTAX30); |
803 |
} |
804 |
|
805 |
|
806 |
/* |
807 |
* Execute B-P command |
808 |
*/ |
809 |
|
810 |
void D64Drive::buffer_ptr_cmd(char *command) |
811 |
{ |
812 |
int channel, pointer, i; |
813 |
|
814 |
if (parse_bcmd(command, &channel, &pointer, &i, &i)) { |
815 |
if (chan_mode[channel] == CHMOD_DIRECT) { |
816 |
buf_ptr[channel] = chan_buf[channel] + pointer; |
817 |
buf_len[channel] = 256 - pointer; |
818 |
set_error(ERR_OK); |
819 |
} else |
820 |
set_error(ERR_NOCHANNEL); |
821 |
} else |
822 |
set_error(ERR_SYNTAX30); |
823 |
} |
824 |
|
825 |
|
826 |
/* |
827 |
* Parse block command parameters |
828 |
* true: OK, false: error |
829 |
*/ |
830 |
|
831 |
bool D64Drive::parse_bcmd(char *cmd, int *arg1, int *arg2, int *arg3, int *arg4) |
832 |
{ |
833 |
int i; |
834 |
|
835 |
if (*cmd == ':') cmd++; |
836 |
|
837 |
// Read four parameters separated by space, cursor right or comma |
838 |
while (*cmd == ' ' || *cmd == 0x1d || *cmd == 0x2c) cmd++; |
839 |
if (!*cmd) return false; |
840 |
|
841 |
i = 0; |
842 |
while (*cmd >= 0x30 && *cmd < 0x40) { |
843 |
i *= 10; |
844 |
i += *cmd++ & 0x0f; |
845 |
} |
846 |
*arg1 = i & 0xff; |
847 |
|
848 |
while (*cmd == ' ' || *cmd == 0x1d || *cmd == 0x2c) cmd++; |
849 |
if (!*cmd) return false; |
850 |
|
851 |
i = 0; |
852 |
while (*cmd >= 0x30 && *cmd < 0x40) { |
853 |
i *= 10; |
854 |
i += *cmd++ & 0x0f; |
855 |
} |
856 |
*arg2 = i & 0xff; |
857 |
|
858 |
while (*cmd == ' ' || *cmd == 0x1d || *cmd == 0x2c) cmd++; |
859 |
if (!*cmd) return false; |
860 |
|
861 |
i = 0; |
862 |
while (*cmd >= 0x30 && *cmd < 0x40) { |
863 |
i *= 10; |
864 |
i += *cmd++ & 0x0f; |
865 |
} |
866 |
*arg3 = i & 0xff; |
867 |
|
868 |
while (*cmd == ' ' || *cmd == 0x1d || *cmd == 0x2c) cmd++; |
869 |
if (!*cmd) return false; |
870 |
|
871 |
i = 0; |
872 |
while (*cmd >= 0x30 && *cmd < 0x40) { |
873 |
i *= 10; |
874 |
i += *cmd++ & 0x0f; |
875 |
} |
876 |
*arg4 = i & 0xff; |
877 |
|
878 |
return true; |
879 |
} |
880 |
|
881 |
|
882 |
/* |
883 |
* Execute 'G' command |
884 |
*/ |
885 |
|
886 |
void D64Drive::chd64_cmd(char *d64name) |
887 |
{ |
888 |
char str[NAMEBUF_LENGTH]; |
889 |
char *p = str; |
890 |
|
891 |
// Convert .d64 file name |
892 |
for (int i=0; i<NAMEBUF_LENGTH && (*p++ = conv_from_64(*d64name++, false)); i++) ; |
893 |
|
894 |
close_all_channels(); |
895 |
|
896 |
// G:. resets the .d64 file name to its original setting |
897 |
if (str[0] == '.' && str[1] == 0) |
898 |
open_close_d64_file(orig_d64_name); |
899 |
else |
900 |
open_close_d64_file(str); |
901 |
|
902 |
// Read BAM |
903 |
read_sector(18, 0, (uint8 *)bam); |
904 |
} |
905 |
|
906 |
|
907 |
/* |
908 |
* Reset drive |
909 |
*/ |
910 |
|
911 |
void D64Drive::Reset(void) |
912 |
{ |
913 |
close_all_channels(); |
914 |
|
915 |
read_sector(18, 0, (uint8 *)bam); |
916 |
|
917 |
cmd_len = 0; |
918 |
for (int i=0; i<4; i++) |
919 |
buf_free[i] = true; |
920 |
|
921 |
set_error(ERR_STARTUP); |
922 |
} |
923 |
|
924 |
|
925 |
/* |
926 |
* Allocate floppy buffer |
927 |
* -> Desired buffer number or -1 |
928 |
* <- Allocated buffer number or -1 |
929 |
*/ |
930 |
|
931 |
int D64Drive::alloc_buffer(int want) |
932 |
{ |
933 |
if (want == -1) { |
934 |
for (want=3; want>=0; want--) |
935 |
if (buf_free[want]) { |
936 |
buf_free[want] = false; |
937 |
return want; |
938 |
} |
939 |
return -1; |
940 |
} |
941 |
|
942 |
if (want < 4) |
943 |
if (buf_free[want]) { |
944 |
buf_free[want] = false; |
945 |
return want; |
946 |
} else |
947 |
return -1; |
948 |
else |
949 |
return -1; |
950 |
} |
951 |
|
952 |
|
953 |
/* |
954 |
* Free floppy buffer |
955 |
*/ |
956 |
|
957 |
void D64Drive::free_buffer(int buf) |
958 |
{ |
959 |
buf_free[buf] = true; |
960 |
} |
961 |
|
962 |
|
963 |
/* |
964 |
* Read sector (256 bytes) |
965 |
* true: success, false: error |
966 |
*/ |
967 |
|
968 |
bool D64Drive::read_sector(int track, int sector, uint8 *buffer) |
969 |
{ |
970 |
int offset; |
971 |
|
972 |
// Convert track/sector to byte offset in file |
973 |
if ((offset = offset_from_ts(track, sector)) < 0) { |
974 |
set_error(ERR_ILLEGALTS); |
975 |
return false; |
976 |
} |
977 |
|
978 |
if (the_file == NULL) { |
979 |
set_error(ERR_NOTREADY); |
980 |
return false; |
981 |
} |
982 |
|
983 |
#ifdef AMIGA |
984 |
if (offset != ftell(the_file)) |
985 |
fseek(the_file, offset + image_header, SEEK_SET); |
986 |
#else |
987 |
fseek(the_file, offset + image_header, SEEK_SET); |
988 |
#endif |
989 |
fread(buffer, 256, 1, the_file); |
990 |
return true; |
991 |
} |
992 |
|
993 |
|
994 |
/* |
995 |
* Convert track/sector to offset |
996 |
*/ |
997 |
|
998 |
const int num_sectors[41] = { |
999 |
0, |
1000 |
21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21, |
1001 |
19,19,19,19,19,19,19, |
1002 |
18,18,18,18,18,18, |
1003 |
17,17,17,17,17, |
1004 |
17,17,17,17,17 // Tracks 36..40 |
1005 |
}; |
1006 |
|
1007 |
const int sector_offset[41] = { |
1008 |
0, |
1009 |
0,21,42,63,84,105,126,147,168,189,210,231,252,273,294,315,336, |
1010 |
357,376,395,414,433,452,471, |
1011 |
490,508,526,544,562,580, |
1012 |
598,615,632,649,666, |
1013 |
683,700,717,734,751 // Tracks 36..40 |
1014 |
}; |
1015 |
|
1016 |
int D64Drive::offset_from_ts(int track, int sector) |
1017 |
{ |
1018 |
if ((track < 1) || (track > NUM_TRACKS) || |
1019 |
(sector < 0) || (sector >= num_sectors[track])) |
1020 |
return -1; |
1021 |
|
1022 |
return (sector_offset[track] + sector) << 8; |
1023 |
} |
1024 |
|
1025 |
|
1026 |
/* |
1027 |
* Conversion PETSCII->ASCII |
1028 |
*/ |
1029 |
|
1030 |
uint8 D64Drive::conv_from_64(uint8 c, bool map_slash) |
1031 |
{ |
1032 |
if ((c >= 'A') && (c <= 'Z') || (c >= 'a') && (c <= 'z')) |
1033 |
return c ^ 0x20; |
1034 |
if ((c >= 0xc1) && (c <= 0xda)) |
1035 |
return c ^ 0x80; |
1036 |
if ((c == '/') && map_slash && ThePrefs.MapSlash) |
1037 |
return '\\'; |
1038 |
return c; |
1039 |
} |