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frodo-wii/Src/1541d64.cpp

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/*
* 1541d64.cpp - 1541 emulation in disk image files (.d64/.x64/zipcode)
*
* Frodo (C) 1994-1997,2002-2005 Christian Bauer
* zipcode decoding routines (C) 1993-1997 Marko Mäkelä, Paul David Doherty
*
* 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
*/
/*
* Incompatibilities:
* - No support for relative files
* - Unimplemented commands: P
* - Impossible to implement: B-E, M-E
*/
#include "sysdeps.h"
#include "1541d64.h"
#include "IEC.h"
#include "Prefs.h"
#include "C64.h"
#include "main.h"
#define DEBUG 0
#include "debug.h"
// Channel modes (IRC users listen up :-)
enum {
CHMOD_FREE, // Channel free
CHMOD_COMMAND, // Command/error channel
CHMOD_DIRECTORY, // Reading directory, using large allocated buffer
CHMOD_FILE, // Sequential file open, using buffer in 1541 RAM
CHMOD_REL, // Relative file open, using buffer in 1541 RAM
CHMOD_DIRECT // Direct buffer access ('#'), using buffer in 1541 RAM
};
// Directory track
const int DIR_TRACK = 18;
// BAM structure
enum {
BAM_DIR_TRACK = 0, // Track...
BAM_DIR_SECTOR = 1, // ...and sector of first directory block (unused)
BAM_FMT_TYPE = 2, // Format type
BAM_BITMAP = 4, // Sector allocation map
BAM_DISK_NAME = 144, // Disk name
BAM_DISK_ID = 162, // Disk ID
BAM_FMT_CHAR = 165 // Format characters
};
// Directory structure
enum {
DIR_NEXT_TRACK = 0, // Track...
DIR_NEXT_SECTOR = 1, // ... and sector of next directory block
DIR_ENTRIES = 2, // Start of directory entries (8)
DE_TYPE = 0, // File type/flags
DE_TRACK = 1, // Track...
DE_SECTOR = 2, // ...and sector of first data block
DE_NAME = 3, // File name
DE_SIDE_TRACK = 19, // Track...
DE_SIDE_SECTOR = 20, // ...and sector of first side sector
DE_REC_LEN = 21, // Record length
DE_OVR_TRACK = 26, // Track...
DE_OVR_SECTOR = 27, // ...and sector on overwrite (@)
DE_NUM_BLOCKS_L = 28, // Number of blocks, LSB
DE_NUM_BLOCKS_H = 29, // Number of blocks, MSB
SIZEOF_DE = 32 // Size of directory entry
};
// Interleave of directory and data blocks
const int DIR_INTERLEAVE = 3;
const int DATA_INTERLEAVE = 10;
// Number of sectors per track, for all tracks
const int num_sectors[41] = {
0,
21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,
19,19,19,19,19,19,19,
18,18,18,18,18,18,
17,17,17,17,17,
17,17,17,17,17 // Tracks 36..40
};
// Accumulated number of sectors
const int accum_num_sectors[41] = {
0,
0,21,42,63,84,105,126,147,168,189,210,231,252,273,294,315,336,
357,376,395,414,433,452,471,
490,508,526,544,562,580,
598,615,632,649,666,
683,700,717,734,751 // Tracks 36..40
};
// Prototypes
static bool match(const uint8 *p, int p_len, const uint8 *n);
static FILE *open_image_file(const char *path, bool write_mode);
static bool parse_image_file(FILE *f, image_file_desc &desc);
/*
* Constructor: Prepare emulation, open image file
*/
ImageDrive::ImageDrive(IEC *iec, const char *filepath) : Drive(iec), the_file(NULL), bam(ram + 0x700), bam_dirty(false)
{
for (int i=0; i<18; i++) {
ch[i].mode = CHMOD_FREE;
ch[i].buf = NULL;
}
ch[15].mode = CHMOD_COMMAND;
Reset();
// Open image file
if (change_image(filepath))
Ready = true;
}
/*
* Destructor
*/
ImageDrive::~ImageDrive()
{
close_image();
}
/*
* Close the image file
*/
void ImageDrive::close_image(void)
{
if (the_file) {
close_all_channels();
if (bam_dirty) {
write_sector(DIR_TRACK, 0, bam);
bam_dirty = false;
}
fclose(the_file);
the_file = NULL;
}
}
/*
* Open the image file
*/
bool ImageDrive::change_image(const char *path)
{
// Close old image file
close_image();
// Open new image file (try write access first, then read-only)
write_protected = false;
the_file = open_image_file(path, true);
if (the_file == NULL) {
write_protected = true;
the_file = open_image_file(path, false);
}
if (the_file) {
// Determine file type and fill in image_file_desc structure
if (!parse_image_file(the_file, desc)) {
fclose(the_file);
the_file = false;
return false;
}
// Read BAM
read_sector(DIR_TRACK, 0, bam);
bam_dirty = false;
return true;
} else
return false;
}
/*
* Open channel
*/
uint8 ImageDrive::Open(int channel, const uint8 *name, int name_len)
{
D(bug("ImageDrive::Open channel %d, file %s\n", channel, name));
set_error(ERR_OK);
// Channel 15: execute file name as command
if (channel == 15) {
execute_cmd(name, name_len);
return ST_OK;
}
if (ch[channel].mode != CHMOD_FREE) {
set_error(ERR_NOCHANNEL);
return ST_OK;
}
if (name[0] == '$')
if (channel)
return open_file_ts(channel, DIR_TRACK, 0);
else
return open_directory(name + 1, name_len - 1);
if (name[0] == '#')
return open_direct(channel, name);
return open_file(channel, name, name_len);
}
/*
* Open file
*/
uint8 ImageDrive::open_file(int channel, const uint8 *name, int name_len)
{
uint8 plain_name[NAMEBUF_LENGTH];
int plain_name_len;
int mode = FMODE_READ;
int type = FTYPE_DEL;
int rec_len = 0;
parse_file_name(name, name_len, plain_name, plain_name_len, mode, type, rec_len);
if (plain_name_len > 16)
plain_name_len = 16;
D(bug(" plain name %s, type %d, mode %d\n", plain_name, type, mode));
// Channel 0 is READ, channel 1 is WRITE
if (channel == 0 || channel == 1) {
mode = channel ? FMODE_WRITE : FMODE_READ;
if (type == FTYPE_DEL)
type = FTYPE_PRG;
}
ch[channel].writing = (mode == FMODE_WRITE || mode == FMODE_APPEND);
// Wildcards are only allowed on reading
if (ch[channel].writing && (strchr((const char *)plain_name, '*') || strchr((const char *)plain_name, '?'))) {
set_error(ERR_SYNTAX33);
return ST_OK;
}
// Check for write-protection if writing
if (ch[channel].writing && write_protected) {
set_error(ERR_WRITEPROTECT);
return ST_OK;
}
// Relative files are not supported
if (type == FTYPE_REL) {
set_error(ERR_UNIMPLEMENTED);
return ST_OK;
}
// Find file in directory
int dir_track, dir_sector, entry;
if (find_first_file(plain_name, plain_name_len, dir_track, dir_sector, entry)) {
// File exists
D(bug(" file exists, dir track %d, sector %d, entry %d\n", dir_track, dir_sector, entry));
ch[channel].dir_track = dir_track;
ch[channel].dir_sector = dir_sector;
ch[channel].entry = entry;
uint8 *de = dir + DIR_ENTRIES + entry * SIZEOF_DE;
// Get file type from existing file if not specified in file name
if (type == FTYPE_DEL)
type = de[DE_TYPE] & 7;
if ((de[DE_TYPE] & 7) != type) {
// File type doesn't match
set_error(ERR_FILETYPE);
} else if (mode == FMODE_WRITE) {
if (name[0] == '@') {
// Open old file for overwriting (save-replace)
return create_file(channel, plain_name, plain_name_len, type, true);
} else {
// File to be written already exists, error
set_error(ERR_FILEEXISTS);
}
} else if (mode == FMODE_APPEND) {
// Open old file for appending
open_file_ts(channel, de[DE_TRACK], de[DE_SECTOR]);
// Seek to end of file
int track = 0, sector = 0, num_blocks = 0;
while (ch[channel].buf[0]) {
if (!read_sector(track = ch[channel].buf[0], sector = ch[channel].buf[1], ch[channel].buf))
return ST_OK;
num_blocks++;
}
// Change channel mode to writing, adjust buffer pointer
ch[channel].writing = true;
ch[channel].buf_len = ch[channel].buf[1] + 1;
ch[channel].buf_ptr = ch[channel].buf + ch[channel].buf_len;
ch[channel].track = track;
ch[channel].sector = sector;
ch[channel].num_blocks = num_blocks;
} else if (mode == FMODE_M) {
// Open old file for reading, even if it is not closed
return open_file_ts(channel, de[DE_TRACK], de[DE_SECTOR]);
} else {
// Open old file for reading, error if file is open
if (de[DE_TYPE] & 0x80)
return open_file_ts(channel, de[DE_TRACK], de[DE_SECTOR]);
else
set_error(ERR_WRITEFILEOPEN);
}
} else {
// File doesn't exist
D(bug(" file not found\n"));
// Set file type to SEQ if not specified in file name
if (type == FTYPE_DEL)
type = FTYPE_SEQ;
if (mode == FMODE_WRITE) {
// Create new file for writing
return create_file(channel, plain_name, plain_name_len, type);
} else
set_error(ERR_FILENOTFOUND);
}
return ST_OK;
}
/*
* Open channel for reading from file given track/sector of first block
*/
uint8 ImageDrive::open_file_ts(int channel, int track, int sector)
{
D(bug("open_file_ts track %d, sector %d\n", track, sector));
// Allocate buffer and set channel mode
int buf = alloc_buffer(-1);
if (buf == -1) {
set_error(ERR_NOCHANNEL);
return ST_OK;
}
ch[channel].buf_num = buf;
ch[channel].buf = ram + 0x300 + buf * 0x100;
ch[channel].mode = CHMOD_FILE;
// On the next call to Read, the first block will be read
ch[channel].buf[0] = track;
ch[channel].buf[1] = sector;
ch[channel].buf_len = 0;
return ST_OK;
}
/*
* Create file and open channel for writing to file
*/
uint8 ImageDrive::create_file(int channel, const uint8 *name, int name_len, int type, bool overwrite)
{
D(bug("create_file %s, type %d\n", name, type));
// Allocate buffer
int buf = alloc_buffer(-1);
if (buf == -1) {
set_error(ERR_NOCHANNEL);
return ST_OK;
}
ch[channel].buf_num = buf;
ch[channel].buf = ram + 0x300 + buf * 0x100;
// Allocate new directory entry if not overwriting
if (!overwrite) {
if (!alloc_dir_entry(ch[channel].dir_track, ch[channel].dir_sector, ch[channel].entry)) {
free_buffer(buf);
return ST_OK;
}
}
uint8 *de = dir + DIR_ENTRIES + ch[channel].entry * SIZEOF_DE;
// Allocate first data block
ch[channel].track = DIR_TRACK - 1;
ch[channel].sector = -DATA_INTERLEAVE;
if (!alloc_next_block(ch[channel].track, ch[channel].sector, DATA_INTERLEAVE)) {
free_buffer(buf);
return ST_OK;
}
ch[channel].num_blocks = 1;
D(bug(" first data block on track %d, sector %d\n", ch[channel].track, ch[channel].sector));
// Write directory entry
memset(de, 0, SIZEOF_DE);
de[DE_TYPE] = type; // bit 7 not set -> open file
if (overwrite) {
de[DE_OVR_TRACK] = ch[channel].track;
de[DE_OVR_SECTOR] = ch[channel].sector;
} else {
de[DE_TRACK] = ch[channel].track;
de[DE_SECTOR] = ch[channel].sector;
}
memset(de + DE_NAME, 0xa0, 16);
memcpy(de + DE_NAME, name, name_len);
write_sector(ch[channel].dir_track, ch[channel].dir_sector, dir);
// Set channel descriptor
ch[channel].mode = CHMOD_FILE;
ch[channel].writing = true;
ch[channel].buf_ptr = ch[channel].buf + 2;
ch[channel].buf_len = 2;
return ST_OK;
}
/*
* Prepare directory as BASIC program (channel 0)
*/
const char type_char_1[] = "DSPUREER";
const char type_char_2[] = "EERSELQG";
const char type_char_3[] = "LQGRL???";
uint8 ImageDrive::open_directory(const uint8 *pattern, int pattern_len)
{
// Special treatment for "$0"
if (pattern[0] == '0' && pattern_len == 1) {
pattern++;
pattern_len--;
}
// Skip everything before the ':' in the pattern
uint8 *t = (uint8 *)memchr(pattern, ':', pattern_len);
if (t) {
t++;
pattern_len -= t - pattern;
pattern = t;
}
ch[0].mode = CHMOD_DIRECTORY;
uint8 *p = ch[0].buf_ptr = ch[0].buf = new uint8[8192];
// Create directory title with disk name, ID and format type
*p++ = 0x01; // Load address $0401 (from PET days :-)
*p++ = 0x04;
*p++ = 0x01; // Dummy line link
*p++ = 0x01;
*p++ = 0; // Drive number (0) as line number
*p++ = 0;
*p++ = 0x12; // RVS ON
*p++ = '\"';
uint8 *q = bam + BAM_DISK_NAME;
for (int i=0; i<23; i++) {
int c;
if ((c = *q++) == 0xa0)
*p++ = ' '; // Replace 0xa0 by space
else
*p++ = c;
}
*(p-7) = '\"';
*p++ = 0;
// Scan all directory blocks
dir[DIR_NEXT_TRACK] = DIR_TRACK;
dir[DIR_NEXT_SECTOR] = 1;
int num_dir_blocks = 0;
while (dir[DIR_NEXT_TRACK] && num_dir_blocks < num_sectors[DIR_TRACK]) {
if (!read_sector(dir[DIR_NEXT_TRACK], dir[DIR_NEXT_SECTOR], dir))
return ST_OK;
num_dir_blocks++;
// Scan all 8 entries of a block
uint8 *de = dir + DIR_ENTRIES;
for (int j=0; j<8; j++, de+=SIZEOF_DE) {
if (de[DE_TYPE] && (pattern_len == 0 || match(pattern, pattern_len, de + DE_NAME))) {
// Dummy line link
*p++ = 0x01;
*p++ = 0x01;
// Line number = number of blocks
*p++ = de[DE_NUM_BLOCKS_L];
*p++ = de[DE_NUM_BLOCKS_H];
// Appropriate number of spaces to align file names
*p++ = ' ';
int n = (de[DE_NUM_BLOCKS_H] << 8) + de[DE_NUM_BLOCKS_L];
if (n<10) *p++ = ' ';
if (n<100) *p++ = ' ';
// File name enclosed in quotes
*p++ = '\"';
q = de + DE_NAME;
uint8 c;
bool m = false;
for (int i=0; i<16; i++) {
if ((c = *q++) == 0xa0) {
if (m)
*p++ = ' '; // Replace all 0xa0 by spaces
else
m = (*p++ = '\"'); // But the first by a '"'
} else
*p++ = c;
}
if (m)
*p++ = ' ';
else
*p++ = '\"'; // No 0xa0, then append a space
// Open files are marked by '*'
if (de[DE_TYPE] & 0x80)
*p++ = ' ';
else
*p++ = '*';
// File type
*p++ = type_char_1[de[DE_TYPE] & 7];
*p++ = type_char_2[de[DE_TYPE] & 7];
*p++ = type_char_3[de[DE_TYPE] & 7];
// Protected files are marked by '<'
if (de[DE_TYPE] & 0x40)
*p++ = '<';
else
*p++ = ' ';
// Appropriate number of spaces at the end
*p++ = ' ';
if (n >= 10) *p++ = ' ';
if (n >= 100) *p++ = ' ';
*p++ = 0;
}
}
}
// Final line, count number of free blocks
int n = 0;
for (int i=1; i<=35; i++) {
if (i != DIR_TRACK) // exclude track 18
n += num_free_blocks(i);
}
*p++ = 0x01; // Dummy line link
*p++ = 0x01;
*p++ = n & 0xff; // Number of free blocks as line number
*p++ = (n >> 8) & 0xff;
*p++ = 'B';
*p++ = 'L';
*p++ = 'O';
*p++ = 'C';
*p++ = 'K';
*p++ = 'S';
*p++ = ' ';
*p++ = 'F';
*p++ = 'R';
*p++ = 'E';
*p++ = 'E';
*p++ = '.';
memset(p, ' ', 13);
p += 13;
*p++ = 0;
*p++ = 0;
*p++ = 0;
ch[0].buf_len = p - ch[0].buf;
return ST_OK;
}
/*
* Open channel for direct buffer access
*/
uint8 ImageDrive::open_direct(int channel, const uint8 *name)
{
int buf = -1;
if (name[1] == 0)
buf = alloc_buffer(-1);
else
if ((name[1] >= '0') && (name[1] <= '3') && (name[2] == 0))
buf = alloc_buffer(name[1] - '0');
if (buf == -1) {
set_error(ERR_NOCHANNEL);
return ST_OK;
}
// The buffers are in the 1541 RAM at $300 and are 256 bytes each
ch[channel].mode = CHMOD_DIRECT;
ch[channel].buf = ram + 0x300 + buf * 0x100;
ch[channel].buf_num = buf;
// Store actual buffer number in buffer
ch[channel].buf[1] = buf + '0';
ch[channel].buf_len = 1;
ch[channel].buf_ptr = ch[channel].buf + 1;
return ST_OK;
}
/*
* Close channel
*/
uint8 ImageDrive::Close(int channel)
{
D(bug("ImageDrive::Close channel %d\n", channel));
switch (ch[channel].mode) {
case CHMOD_FREE:
break;
case CHMOD_COMMAND:
close_all_channels();
break;
case CHMOD_DIRECT:
free_buffer(ch[channel].buf_num);
ch[channel].buf = NULL;
ch[channel].mode = CHMOD_FREE;
break;
case CHMOD_FILE:
if (ch[channel].writing) {
// Current block empty? Then write CR character
if (ch[channel].buf_len == 2) {
ch[channel].buf[2] = 0x0d;
ch[channel].buf_len++;
}
// Write last data block
ch[channel].buf[0] = 0;
ch[channel].buf[1] = ch[channel].buf_len - 1;
D(bug(" writing last data block\n"));
if (!write_sector(ch[channel].track, ch[channel].sector, ch[channel].buf))
goto free;
// Close write file in directory
read_sector(ch[channel].dir_track, ch[channel].dir_sector, dir);
uint8 *de = dir + DIR_ENTRIES + ch[channel].entry * SIZEOF_DE;
de[DE_TYPE] |= 0x80;
de[DE_NUM_BLOCKS_L] = ch[channel].num_blocks & 0xff;
de[DE_NUM_BLOCKS_H] = ch[channel].num_blocks >> 8;
if (de[DE_OVR_TRACK]) {
// Overwriting, free old data blocks and set pointer to new ones
free_block_chain(de[DE_TRACK], de[DE_SECTOR]);
de[DE_TRACK] = de[DE_OVR_TRACK];
de[DE_SECTOR] = de[DE_OVR_SECTOR];
de[DE_OVR_TRACK] = de[DE_OVR_SECTOR] = 0;
}
write_sector(ch[channel].dir_track, ch[channel].dir_sector, dir);
D(bug(" directory entry updated\n"));
}
free: free_buffer(ch[channel].buf_num);
ch[channel].buf = NULL;
ch[channel].mode = CHMOD_FREE;
break;
case CHMOD_DIRECTORY:
delete[] ch[channel].buf;
ch[channel].buf = NULL;
ch[channel].mode = CHMOD_FREE;
break;
}
return ST_OK;
}
/*
* Close all channels
*/
void ImageDrive::close_all_channels()
{
for (int i=0; i<15; i++)
Close(i);
Close(16);
Close(17);
cmd_len = 0;
}
/*
* Read from channel
*/
uint8 ImageDrive::Read(int channel, uint8 &byte)
{
// D(bug("ImageDrive::Read channel %d\n", channel));
switch (ch[channel].mode) {
case CHMOD_FREE:
if (current_error == ERR_OK)
set_error(ERR_FILENOTOPEN);
break;
case CHMOD_COMMAND:
// Read error channel
byte = *error_ptr++;
if (--error_len)
return ST_OK;
else {
set_error(ERR_OK);
return ST_EOF;
}
break;
case CHMOD_FILE:
if (ch[channel].writing)
return ST_READ_TIMEOUT;
if (current_error != ERR_OK)
return ST_READ_TIMEOUT;
// Read next block if necessary
if (ch[channel].buf_len == 0 && ch[channel].buf[0]) {
D(bug(" reading next data block track %d, sector %d\n", ch[channel].buf[0], ch[channel].buf[1]));
if (!read_sector(ch[channel].buf[0], ch[channel].buf[1], ch[channel].buf))
return ST_READ_TIMEOUT;
ch[channel].buf_ptr = ch[channel].buf + 2;
// Determine block length
ch[channel].buf_len = ch[channel].buf[0] ? 254 : ch[channel].buf[1] - 1;
}
if (ch[channel].buf_len > 0) {
byte = *(ch[channel].buf_ptr)++;
if (--(ch[channel].buf_len) == 0 && ch[channel].buf[0] == 0)
return ST_EOF;
else
return ST_OK;
} else
return ST_READ_TIMEOUT;
break;
case CHMOD_DIRECTORY:
case CHMOD_DIRECT:
if (ch[channel].buf_len > 0) {
byte = *(ch[channel].buf_ptr)++;
if (--(ch[channel].buf_len))
return ST_OK;
else
return ST_EOF;
} else
return ST_READ_TIMEOUT;
break;
}
return ST_READ_TIMEOUT;
}
/*
* Write byte to channel
*/
uint8 ImageDrive::Write(int channel, uint8 byte, bool eoi)
{
// D(bug("ImageDrive::Write channel %d, byte %02x, eoi %d\n", channel, byte, eoi));
switch (ch[channel].mode) {
case CHMOD_FREE:
if (current_error == ERR_OK)
set_error(ERR_FILENOTOPEN);
break;
case CHMOD_COMMAND:
// Collect characters and execute command on EOI
if (cmd_len > 58) {
set_error(ERR_SYNTAX32);
return ST_TIMEOUT;
}
cmd_buf[cmd_len++] = byte;
if (eoi) {
execute_cmd(cmd_buf, cmd_len);
cmd_len = 0;
}
return ST_OK;
case CHMOD_DIRECTORY:
set_error(ERR_WRITEFILEOPEN);
break;
case CHMOD_FILE:
if (!ch[channel].writing)
return ST_TIMEOUT;
if (current_error != ERR_OK)
return ST_TIMEOUT;
// Buffer full?
if (ch[channel].buf_len >= 256) {
// Yes, allocate new block
int track = ch[channel].track, sector = ch[channel].sector;
if (!alloc_next_block(track, sector, DATA_INTERLEAVE))
return ST_TIMEOUT;
ch[channel].num_blocks++;
D(bug("next data block on track %d, sector %d\n", track, sector));
// Write buffer with link to new block
ch[channel].buf[0] = track;
ch[channel].buf[1] = sector;
write_sector(ch[channel].track, ch[channel].sector, ch[channel].buf);
// Reset buffer
ch[channel].buf_ptr = ch[channel].buf + 2;
ch[channel].buf_len = 2;
ch[channel].track = track;
ch[channel].sector = sector;
}
*(ch[channel].buf_ptr)++ = byte;
ch[channel].buf_len++;
return ST_OK;
case CHMOD_DIRECT:
if (ch[channel].buf_len < 256) {
*(ch[channel].buf_ptr)++ = byte;
ch[channel].buf_len++;
return ST_OK;
} else
return ST_TIMEOUT;
break;
}
return ST_TIMEOUT;
}
/*
* Reset drive
*/
void ImageDrive::Reset(void)
{
close_all_channels();
cmd_len = 0;
for (int i=0; i<4; i++)
buf_free[i] = true;
if (bam_dirty) {
write_sector(DIR_TRACK, 0, bam);
bam_dirty = false;
}
memset(ram, 0, sizeof(ram));
read_sector(DIR_TRACK, 0, bam);
set_error(ERR_STARTUP);
}
/*
* Allocate floppy buffer
* -> Desired buffer number or -1
* <- Allocated buffer number or -1
*/
int ImageDrive::alloc_buffer(int want)
{
if (want == -1) {
for (want=3; want>=0; want--)
if (buf_free[want]) {
buf_free[want] = false;
return want;
}
return -1;
}
if (want < 4)
if (buf_free[want]) {
buf_free[want] = false;
return want;
} else
return -1;
else
return -1;
}
/*
* Free floppy buffer
*/
void ImageDrive::free_buffer(int buf)
{
buf_free[buf] = true;
}
/*
* Search file in directory, return directory track/sector and entry number
* false: not found, true: found
*/
// Return true if name 'n' matches pattern 'p'
static bool match(const uint8 *p, int p_len, const uint8 *n)
{
if (p_len > 16)
p_len = 16;
int c = 0;
while (p_len-- > 0) {
if (*p == '*') // Wildcard '*' matches all following characters
return true;
if ((*p != *n) && (*p != '?')) // Wildcard '?' matches single character
return false;
p++; n++; c++;
}
return *n == 0xa0 || c == 16;
}
bool ImageDrive::find_file(const uint8 *pattern, int pattern_len, int &dir_track, int &dir_sector, int &entry, bool cont)
{
// Counter to prevent cyclic directories from resulting in an infinite loop
int num_dir_blocks = 0;
// Pointer to current directory entry
uint8 *de = NULL;
if (cont)
de = dir + DIR_ENTRIES + entry * SIZEOF_DE;
else {
dir[DIR_NEXT_TRACK] = DIR_TRACK;
dir[DIR_NEXT_SECTOR] = 1;
entry = 8;
}
while (num_dir_blocks < num_sectors[DIR_TRACK]) {
// Goto next entry
entry++; de += SIZEOF_DE;
if (entry >= 8) {
// Read next directory block
if (dir[DIR_NEXT_TRACK] == 0)
return false;
if (!read_sector(dir_track = dir[DIR_NEXT_TRACK], dir_sector = dir[DIR_NEXT_SECTOR], dir))
return false;
num_dir_blocks++;
entry = 0;
de = dir + DIR_ENTRIES;
}
// Does entry match pattern?
if (de[DE_TYPE] && match(pattern, pattern_len, de + DE_NAME))
return true;
}
return false;
}
bool ImageDrive::find_first_file(const uint8 *pattern, int pattern_len, int &dir_track, int &dir_sector, int &entry)
{
return find_file(pattern, pattern_len, dir_track, dir_sector, entry, false);
}
bool ImageDrive::find_next_file(const uint8 *pattern, int pattern_len, int &dir_track, int &dir_sector, int &entry)
{
return find_file(pattern, pattern_len, dir_track, dir_sector, entry, true);
}
/*
* Allocate new entry in directory, returns false on error (usually when
* all sectors of track 18 are allocated)
* The track/sector and entry numbers are returned
*/
bool ImageDrive::alloc_dir_entry(int &track, int &sector, int &entry)
{
// First look for free entry in existing directory blocks
dir[DIR_NEXT_TRACK] = DIR_TRACK;
dir[DIR_NEXT_SECTOR] = 1;
while (dir[DIR_NEXT_TRACK]) {
if (!read_sector(track = dir[DIR_NEXT_TRACK], sector = dir[DIR_NEXT_SECTOR], dir))
return false;
uint8 *de = dir + DIR_ENTRIES;
for (entry=0; entry<8; entry++, de+=SIZEOF_DE) {
if (de[DE_TYPE] == 0) {
D(bug(" allocated entry %d in dir track %d, sector %d\n", entry, track, sector));
return true;
}
}
}
// No free entry found, allocate new directory block
int last_track = track, last_sector = sector;
if (!alloc_next_block(track, sector, DIR_INTERLEAVE))
return false;
D(bug(" new directory block track %d, sector %d\n", track, sector));
// Write link to new block to last block
dir[DIR_NEXT_TRACK] = track;
dir[DIR_NEXT_SECTOR] = sector;
write_sector(last_track, last_sector, dir);
// Write new empty directory block and return first entry
memset(dir, 0, 256);
dir[DIR_NEXT_SECTOR] = 0xff;
write_sector(track, sector, dir);
entry = 0;
return true;
}
/*
* Test if block is free in BAM (track/sector are not checked for validity)
*/
bool ImageDrive::is_block_free(int track, int sector)
{
uint8 *p = bam + BAM_BITMAP + (track - 1) * 4;
int byte = sector / 8 + 1;
int bit = sector & 7;
return p[byte] & (1 << bit);
}
/*
* Get number of free blocks on a track
*/
int ImageDrive::num_free_blocks(int track)
{
return bam[BAM_BITMAP + (track - 1) * 4];
}
/*
* Clear BAM, mark all blocks as free
*/
static void clear_bam(uint8 *bam)
{
for (int track=1; track<=35; track++) {
static const uint8 num2bits[8] = {0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff};
(bam + BAM_BITMAP)[(track-1) * 4 + 0] = num_sectors[track];
(bam + BAM_BITMAP)[(track-1) * 4 + 1] = 0xff;
(bam + BAM_BITMAP)[(track-1) * 4 + 2] = 0xff;
(bam + BAM_BITMAP)[(track-1) * 4 + 3] = num2bits[num_sectors[track] - 16];
}
}
/*
* Allocate block in BAM, returns error code
*/
int ImageDrive::alloc_block(int track, int sector)
{
if (track < 1 || track > 35 || sector < 0 || sector >= num_sectors[track])
return ERR_ILLEGALTS;
uint8 *p = bam + BAM_BITMAP + (track - 1) * 4;
int byte = sector / 8 + 1;
int bit = sector & 7;
// Block free?
if (p[byte] & (1 << bit)) {
// Yes, allocate and decrement free block count
D(bug("allocating block at track %d, sector %d\n", track, sector));
p[byte] &= ~(1 << bit);
p[0]--;
bam_dirty = true;
return ERR_OK;
} else
return ERR_NOBLOCK;
}
/*
* Free block in BAM, returns error code
*/
int ImageDrive::free_block(int track, int sector)
{
if (track < 1 || track > 35 || sector < 0 || sector >= num_sectors[track])
return ERR_ILLEGALTS;
uint8 *p = bam + BAM_BITMAP + (track - 1) * 4;
int byte = sector / 8 + 1;
int bit = sector & 7;
// Block allocated?
if (!(p[byte] & (1 << bit))) {
// Yes, free and increment free block count
D(bug("freeing block at track %d, sector %d\n", track, sector));
p[byte] |= (1 << bit);
p[0]++;
bam_dirty = true;
}
return ERR_OK;
}
/*
* Allocate chain of data blocks in BAM
*/
bool ImageDrive::alloc_block_chain(int track, int sector)
{
uint8 buf[256];
while (alloc_block(track, sector) == ERR_OK) {
if (!read_sector(track, sector, buf))
return false;
track = buf[0];
sector = buf[1];
}
return true;
}
/*
* Free chain of data blocks in BAM
*/
bool ImageDrive::free_block_chain(int track, int sector)
{
uint8 buf[256];
while (free_block(track, sector) == ERR_OK) {
if (!read_sector(track, sector, buf))
return false;
track = buf[0];
sector = buf[1];
}
return true;
}
/*
* Search and allocate next free block, returns false if no more blocks
* are free (ERR_DISKFULL is also set in this case)
* "track" and "sector" must be set to the block where the search should
* begin
*/
bool ImageDrive::alloc_next_block(int &track, int &sector, int interleave)
{
// Find track with free blocks
bool side_changed = false;
while (num_free_blocks(track) == 0) {
if (track == DIR_TRACK) { // Directory doesn't grow to other tracks
full: track = sector = 0;
set_error(ERR_DISKFULL);
return false;
} else if (track > DIR_TRACK) {
track++;
if (track > 35) {
if (!side_changed)
side_changed = true;
else
goto full;
track = DIR_TRACK - 1;
sector = 0;
}
} else {
track--;
if (track < 1) {
if (!side_changed)
side_changed = true;
else
goto full;
track = DIR_TRACK + 1;
sector = 0;
}
}
}
// Find next free block on track
int num = num_sectors[track];
sector = sector + interleave;
if (sector >= num) {
sector -= num;
if (sector)
sector--;
}
while (!is_block_free(track, sector)) {
sector++;
if (sector >= num_sectors[track]) {
sector = 0;
while (!is_block_free(track, sector)) {
sector++;
if (sector >= num_sectors[track]) {
// Something is wrong: the BAM free block count for this
// track was >0, but we found no free blocks
track = sector = 0;
set_error(ERR_DIRERROR);
return false;
}
}
}
}
alloc_block(track, sector);
return true;
}
/*
* Sector reading/writing routines
*/
static long offset_from_ts(const image_file_desc &desc, int track, int sector)
{
if ((track < 1) || (track > desc.num_tracks)
|| (sector < 0) || (sector >= num_sectors[track]))
return -1;
return ((accum_num_sectors[track] + sector) << 8) + desc.header_size;
}
// Get number of sectors per given track
int sectors_per_track(const image_file_desc &desc, int track)
{
return num_sectors[track];
}
// Get reference to error info byte of given track/sector
uint8 &error_info_for_sector(image_file_desc &desc, int track, int sector)
{
return desc.error_info[accum_num_sectors[track] + sector];
}
static inline const uint8 &error_info_for_sector(const image_file_desc &desc, int track, int sector)
{
return desc.error_info[accum_num_sectors[track] + sector];
}
const int conv_job_error[16] = {
ERR_OK, // 0 -> 00 OK
ERR_OK, // 1 -> 00 OK
ERR_READ20, // 2 -> 20 READ ERROR
ERR_READ21, // 3 -> 21 READ ERROR
ERR_READ22, // 4 -> 22 READ ERROR
ERR_READ23, // 5 -> 23 READ ERROR
ERR_READ24, // 6 -> 24 READ ERROR (undetected by 1541)
ERR_WRITE25, // 7 -> 25 WRITE ERROR
ERR_WRITEPROTECT, // 8 -> 26 WRITE PROTECT ON
ERR_READ27, // 9 -> 27 READ ERROR
ERR_WRITE28, // 10 -> 28 WRITE ERROR
ERR_DISKID, // 11 -> 29 DISK ID MISMATCH
ERR_OK, // 12 -> 00 OK
ERR_OK, // 13 -> 00 OK
ERR_OK, // 14 -> 00 OK
ERR_NOTREADY // 15 -> 74 DRIVE NOT READY
};
// Read sector, return error code
static int read_sector(FILE *f, const image_file_desc &desc, int track, int sector, uint8 *buffer)
{
// Convert track/sector to byte offset in file
long offset = offset_from_ts(desc, track, sector);
if (offset < 0)
return ERR_ILLEGALTS;
if (f == NULL)
return ERR_NOTREADY;
fseek(f, offset, SEEK_SET);
if (fread(buffer, 1, 256, f) != 256)
return ERR_READ22;
else {
unsigned int error = error_info_for_sector(desc, track, sector);
return conv_job_error[error & 0x0f];
}
}
// Write sector, return error code
static int write_sector(FILE *f, const image_file_desc &desc, int track, int sector, uint8 *buffer)
{
// Convert track/sector to byte offset in file
long offset = offset_from_ts(desc, track, sector);
if (offset < 0)
return ERR_ILLEGALTS;
if (f == NULL)
return ERR_NOTREADY;
fseek(f, offset, SEEK_SET);
if (fwrite(buffer, 1, 256, f) != 256)
return ERR_WRITE25;
else
return ERR_OK;
}
// Read sector and set error message, returns false on error
bool ImageDrive::read_sector(int track, int sector, uint8 *buffer)
{
int error = ::read_sector(the_file, desc, track, sector, buffer);
if (error)
set_error(error, track, sector);
return error == ERR_OK;
}
// Write sector and set error message, returns false on error
bool ImageDrive::write_sector(int track, int sector, uint8 *buffer)
{
int error = ::write_sector(the_file, desc, track, sector, buffer);
if (error)
set_error(error, track, sector);
return error == ERR_OK;
}
// Write error info back to image file
static void write_back_error_info(FILE *f, const image_file_desc &desc)
{
if (desc.type == TYPE_D64 && desc.has_error_info) {
int num_sectors = desc.num_tracks == 40 ? NUM_SECTORS_40 : NUM_SECTORS_35;
fseek(f, num_sectors * 256, SEEK_SET);
fwrite(desc.error_info, num_sectors, 1, f);
}
}
// Format disk image
static bool format_image(FILE *f, image_file_desc &desc, bool lowlevel, uint8 id1, uint8 id2, const uint8 *disk_name, int disk_name_len)
{
uint8 p[256];
if (lowlevel) {
// Fill buffer with 1541 empty sector pattern (4b 01 01 ...,
// except on track 1 where it's 01 01 01 ...)
memset(p, 1, 256);
// Overwrite all blocks
for (int track=1; track<=35; track++) {
if (track == 2)
p[0] = 0x4b;
for (int sector=0; sector<num_sectors[track]; sector++) {
if (write_sector(f, desc, track, sector, p) != ERR_OK)
return false;
}
}
// Clear and write error info
memset(desc.error_info, 1, sizeof(desc.error_info));
write_back_error_info(f, desc);
// Clear BAM
memset(p, 0, 256);
} else {
// Read BAM
if (read_sector(f, desc, DIR_TRACK, 0, p) != ERR_OK)
return false;
}
// Create and write empty BAM
p[BAM_DIR_TRACK] = DIR_TRACK;
p[BAM_DIR_SECTOR] = 1;
p[BAM_FMT_TYPE] = 'A';
clear_bam(p);
p[BAM_BITMAP + (DIR_TRACK - 1) * 4 + 0] -= 2; // Allocate BAM and first directory block
p[BAM_BITMAP + (DIR_TRACK - 1) * 4 + 1] &= 0xfc;
memset(p + BAM_DISK_NAME, 0xa0, 27);
if (disk_name_len > 16)
disk_name_len = 16;
memcpy(p + BAM_DISK_NAME, disk_name, disk_name_len);
p[BAM_DISK_ID] = id1;
p[BAM_DISK_ID + 1] = id2;
p[BAM_FMT_CHAR] = '2';
p[BAM_FMT_CHAR + 1] = 'A';
if (write_sector(f, desc, DIR_TRACK, 0, p) != ERR_OK)
return false;
// Create and write empty directory
memset(p, 0, 256);
p[1] = 255;
return write_sector(f, desc, DIR_TRACK, 1, p) == ERR_OK;
}
/*
* Execute drive commands
*/
// BLOCK-READ:channel,0,track,sector
void ImageDrive::block_read_cmd(int channel, int track, int sector, bool user_cmd)
{
if (channel >= 16 || ch[channel].mode != CHMOD_DIRECT) {
set_error(ERR_NOCHANNEL);
return;
}
if (!read_sector(track, sector, ch[channel].buf))
return;
if (user_cmd) {
ch[channel].buf_len = 256;
ch[channel].buf_ptr = ch[channel].buf;
} else {
ch[channel].buf_len = ch[channel].buf[0];
ch[channel].buf_ptr = ch[channel].buf + 1;
}
}
// BLOCK-WRITE:channel,0,track,sector
void ImageDrive::block_write_cmd(int channel, int track, int sector, bool user_cmd)
{
if (write_protected) {
set_error(ERR_WRITEPROTECT);
return;
}
if (channel >= 16 || ch[channel].mode != CHMOD_DIRECT) {
set_error(ERR_NOCHANNEL);
return;
}
if (!user_cmd)
ch[channel].buf[0] = ch[channel].buf_len ? ch[channel].buf_len - 1 : 1;
if (!write_sector(track, sector, ch[channel].buf))
return;
if (!user_cmd) {
ch[channel].buf_len = 1;
ch[channel].buf_ptr = ch[channel].buf + 1;
}
}
// BLOCK-ALLOCATE:0,track,sector
void ImageDrive::block_allocate_cmd(int track, int sector)
{
int err = alloc_block(track, sector);
if (err) {
if (err == ERR_NOBLOCK) {
// Find next free block and return its track/sector address in the
// error message (only look on higher tracks)
for (;;) {
sector++;
if (sector >= num_sectors[track]) {
track++;
sector = 0;
if (track > 35) {
set_error(ERR_NOBLOCK, 0, 0);
return;
}
}
if (is_block_free(track, sector)) {
set_error(ERR_NOBLOCK, track, sector);
return;
}
}
} else
set_error(err, track, sector);
}
}
// BLOCK-FREE:0,track,sector
void ImageDrive::block_free_cmd(int track, int sector)
{
int err = free_block(track, sector);
if (err)
set_error(err, track, sector);
}
// BUFFER-POINTER:channel,pos
void ImageDrive::buffer_pointer_cmd(int channel, int pos)
{
if (channel >= 16 || ch[channel].mode != CHMOD_DIRECT) {
set_error(ERR_NOCHANNEL);
return;
}
ch[channel].buf_ptr = ch[channel].buf + pos;
ch[channel].buf_len = 256 - pos;
}
// M-R<adr low><adr high>[<number>]
void ImageDrive::mem_read_cmd(uint16 adr, uint8 len)
{
error_len = len;
if (adr >= 0x300 && adr < 0x1000) {
// Read from RAM
error_ptr = (char *)ram + (adr & 0x7ff);
} else if (adr >= 0xc000) {
// Read from ROM
error_ptr = (char *)(TheC64->ROM1541) + (adr - 0xc000);
} else {
unsupp_cmd();
memset(error_buf, 0, len);
error_ptr = error_buf;
}
}
// M-W<adr low><adr high><number><data...>
void ImageDrive::mem_write_cmd(uint16 adr, uint8 len, uint8 *p)
{
while (len) {
if (adr >= 0x300 && adr < 0x1000) {
// Write to RAM
ram[adr & 0x7ff] = *p;
} else if (adr < 0xc000) {
unsupp_cmd();
return;
}
len--; adr++; p++;
}
}
// COPY:new=file1,file2,...
// ^ ^
// new_file old_files
void ImageDrive::copy_cmd(const uint8 *new_file, int new_file_len, const uint8 *old_files, int old_files_len)
{
// Check if destination file is already present
int dir_track, dir_sector, entry;
if (find_first_file(new_file, new_file_len, dir_track, dir_sector, entry)) {
set_error(ERR_FILEEXISTS);
return;
}
// Loop for all source files
bool first = true;
while (old_files_len > 0) {
uint8 *comma = (uint8 *)memchr(old_files, ',', old_files_len);
int name_len = comma ? comma - old_files : old_files_len;
// Check if source file is present
if (!find_first_file(old_files, name_len, dir_track, dir_sector, entry)) {
set_error(ERR_FILENOTFOUND);
Close(17);
return;
}
uint8 *de = dir + DIR_ENTRIES + entry * SIZEOF_DE;
uint8 type = de[DE_TYPE] & 7, track = de[DE_TRACK], sector = de[DE_SECTOR];
// If this is the first source file, open internal write channel for destination file
if (first) {
create_file(17, new_file, new_file_len, type, false);
if (ch[17].mode == CHMOD_FREE)
return;
first = false;
}
// Open internal read channel for source file
open_file_ts(16, track, sector);
if (ch[16].mode == CHMOD_FREE) {
Close(17);
return;
}
// Copy file
uint8 byte, st;
do {
st = Read(16, byte);
Write(17, byte, false);
} while (st == ST_OK);
Close(16);
if (st != ST_EOF) {
Close(17);
return;
}
if (comma) {
old_files_len -= name_len + 1;
old_files = comma + 1;
} else
old_files_len = 0;
}
Close(17);
}
// RENAME:new=old
// ^ ^
// new_file old_file
void ImageDrive::rename_cmd(const uint8 *new_file, int new_file_len, const uint8 *old_file, int old_file_len)
{
// Check if destination file is already present
int dir_track, dir_sector, entry;
if (find_first_file(new_file, new_file_len, dir_track, dir_sector, entry)) {
set_error(ERR_FILEEXISTS);
return;
}
// Check if source file is present
if (!find_first_file(old_file, old_file_len, dir_track, dir_sector, entry)) {
set_error(ERR_FILENOTFOUND);
return;
}
// Check for write-protection
if (write_protected) {
set_error(ERR_WRITEPROTECT);
return;
}
// Rename file in directory entry
uint8 *p = dir + DIR_ENTRIES + entry * SIZEOF_DE;
memset(p + DE_NAME, 0xa0, 16);
memcpy(p + DE_NAME, new_file, new_file_len);
write_sector(dir_track, dir_sector, dir);
}
// SCRATCH:file1,file2,...
// ^
// files
void ImageDrive::scratch_cmd(const uint8 *files, int files_len)
{
// Check for write-protection
if (write_protected) {
set_error(ERR_WRITEPROTECT);
return;
}
// Loop for all files
int num_files = 0;
while (files_len > 0) {
uint8 *comma = (uint8 *)memchr(files, ',', files_len);
int name_len = comma ? comma - files : files_len;
int dir_track, dir_sector, entry;
if (find_first_file(files, name_len, dir_track, dir_sector, entry)) {
do {
uint8 *de = dir + DIR_ENTRIES + entry * SIZEOF_DE;
// File protected? Then skip
if (de[DE_TYPE] & 0x40)
continue;
// Free allocated data blocks and side sectors
free_block_chain(de[DE_TRACK], de[DE_SECTOR]);
free_block_chain(de[DE_SIDE_TRACK], de[DE_SIDE_SECTOR]);
// Clear file type
de[DE_TYPE] = 0;
// Write directory block back
write_sector(dir_track, dir_sector, dir);
num_files++;
} while (find_next_file(files, name_len, dir_track, dir_sector, entry));
}
if (comma) {
files_len -= name_len + 1;
files = comma + 1;
} else
files_len = 0;
}
// Report number of files scratched
set_error(ERR_SCRATCHED, num_files);
}
// INITIALIZE
void ImageDrive::initialize_cmd(void)
{
// Close all channels and re-read BAM
close_all_channels();
if (bam_dirty) {
write_sector(DIR_TRACK, 0, bam);
bam_dirty = false;
}
read_sector(DIR_TRACK, 0, bam);
}
// NEW:name,id
// ^ ^
// name comma (or NULL)
void ImageDrive::new_cmd(const uint8 *name, int name_len, const uint8 *comma)
{
// Check for write-protection
if (write_protected) {
set_error(ERR_WRITEPROTECT);
return;
}
// Remember current ID
uint8 id1 = bam[BAM_DISK_ID], id2 = bam[BAM_DISK_ID + 1];
// Formatting with ID?
if (comma) {
close_all_channels();
// Clear BAM buffer
memset(bam, 0, 256);
// Get ID from command
if (comma[1]) {
id1 = comma[1];
id2 = comma[2] ? comma[2] : ' ';
} else {
id1 = id2 = ' ';
}
}
// Format disk image
format_image(the_file, desc, comma, id1, id2, name, name_len);
// Re-read BAM
read_sector(DIR_TRACK, 0, bam);
bam_dirty = false;
}
// VALIDATE
void ImageDrive::validate_cmd(void)
{
// Backup of old BAM in case something goes amiss
uint8 old_bam[256];
memcpy(old_bam, bam, 256);
// Clear BAM
clear_bam(bam);
bam_dirty = true;
// Allocate BAM and directory
if (!alloc_block_chain(DIR_TRACK, 0)) {
memcpy(bam, old_bam, 256);
return;
}
// Allocate all file data and side sector blocks
int dir_track, dir_sector, entry;
if (find_first_file((uint8 *)"*", 1, dir_track, dir_sector, entry)) {
do {
uint8 *de = dir + DIR_ENTRIES + entry * SIZEOF_DE;
if (de[DE_TYPE] & 0x80) {
// Closed file, allocate all file data and side sector blocks
if (!alloc_block_chain(de[DE_TRACK], de[DE_SECTOR]) || !alloc_block_chain(de[DE_SIDE_TRACK], de[DE_SIDE_SECTOR])) {
memcpy(bam, old_bam, 256);
return;
}
} else {
// Open file, delete it
de[DE_TYPE] = 0;
write_sector(dir_track, dir_sector, dir);
}
} while (find_next_file((uint8 *)"*", 1, dir_track, dir_sector, entry));
}
}
/*
* Check whether file with given header (64 bytes) and size looks like one
* of the file types supported by this module
*/
static bool is_d64_file(const uint8 *header, long size)
{
return size == NUM_SECTORS_35 * 256 || size == NUM_SECTORS_35 * 257
|| size == NUM_SECTORS_40 * 256 || size == NUM_SECTORS_40 * 257;
}
static bool is_ed64_file(const uint8 *header, long size)
{
// 35-track d64 file with header ID at the end (only used internally for
// converted zipcode files)
return size == NUM_SECTORS_35 * 256 + 2;
}
static bool is_x64_file(const uint8 *header, long size)
{
return memcmp(header, "C\x15\x41\x64\x01\x02", 6) == 0;
}
static bool is_zipcode_file(const char *path)
{
#if 0
string base, part;
SplitPath(path, base, part);
return part.length() > 2 && part[0] >= '1' && part[0] <= '4' && part[1] == '!';
#else
return false;
#endif
}
bool IsImageFile(const char *path, const uint8 *header, long size)
{
return is_d64_file(header, size) || is_x64_file(header, size) || is_zipcode_file(path);
}
#if 0
/*
* Convert zipcode file to extended d64 file (d64 file with header ID)
*/
static FILE *open_zipcode_file(FILE *old, int num, const string &base, string &part, uint8 &id1, uint8 &id2)
{
if (old)
fclose(old);
part[0] = num + '1';
FILE *f = fopen(AddToPath(base, part).c_str(), "rb");
if (f == NULL)
return NULL;
if (fseek(f, 2, SEEK_SET) < 0) {
fclose(f);
return NULL;
}
if (num == 0) {
id1 = getc(f);
id2 = getc(f);
}
return f;
}
static FILE *convert_zipcode_to_ed64(const string &path)
{
FILE *in = NULL, *out = NULL;
uint8 id1, id2;
// Split input file name
string base, part;
SplitPath(path, base, part);
// Open output file
out = tmpfile();
if (out == NULL)
goto error;
// Decode all tracks
for (int track=1; track<=35; track++) {
int max_sect = 17 + ((track < 31) ? 1 : 0) + ((track < 25) ? 1 : 0) + ((track < 18) ? 2 : 0);
// Select appropriate input file
switch (track) {
case 1:
if ((in = open_zipcode_file(NULL, 0, base, part, id1, id2)) == NULL)
goto error;
break;
case 9:
if ((in = open_zipcode_file(in, 1, base, part, id1, id2)) == NULL)
goto error;
break;
case 17:
if ((in = open_zipcode_file(in, 2, base, part, id1, id2)) == NULL)
goto error;
break;
case 26:
if ((in = open_zipcode_file(in, 3, base, part, id1, id2)) == NULL)
goto error;
break;
}
// Clear "sector read" flags
bool sect_flag[21];
for (int i=0; i<max_sect; i++)
sect_flag[i] = false;
// Read track
uint8 act_track[21 * 256];
for (int i=0; i<max_sect; i++) {
// Read and verify track/sector number
uint8 t = getc(in);
uint8 s = getc(in);
if ((t & 0x3f) != track || s >= max_sect || sect_flag[s] || feof(in))
goto error;
sect_flag[s] = true;
uint8 *p = act_track + s * 256;
// Uncompress sector
if (t & 0x80) {
// Run-length encoded sector
uint8 len = getc(in);
uint8 rep = getc(in);
int count = 0;
for (int j=0; j<len; j++) {
if (feof(in))
goto error;
uint8 c = getc(in);
if (c != rep)
p[count++] = c;
else {
uint8 repnum = getc(in);
if (feof(in))
goto error;
c = getc(in);
j += 2;
for (int k=0; k<repnum; k++)
p[count++] = c;
}
}
} else if (t & 0x40) {
// Sector filled with constant byte
if (feof(in))
goto error;
uint8 c = getc(in);
memset(p, c, 256);
} else {
// Plain sector
if (fread(p, 1, 256, in) != 256)
goto error;
}
}
// Write track
if (fwrite(act_track, 256, max_sect, out) != (size_t)max_sect)
goto error;
}
// Write header ID
putc(id1, out);
putc(id2, out);
// Done
fclose(in);
fseek(out, 0, SEEK_SET);
return out;
error:
if (in)
fclose(in);
if (out)
fclose(out);
return NULL;
}
#endif
/*
* Open disk image file, return file handle
*/
static FILE *open_image_file(const char *path, bool write_mode)
{
#if 0
if (is_zipcode_file(path)) {
if (write_mode)
return NULL;
else
return convert_zipcode_to_ed64(path);
} else
#endif
return fopen(path, write_mode ? "r+b" : "rb");
}
/*
* Parse image file and fill in image_file_desc structure
*/
static bool parse_d64_file(FILE *f, image_file_desc &desc, bool has_header_id)
{
// .d64 files have no header
desc.type = has_header_id ? TYPE_ED64 : TYPE_D64;
desc.header_size = 0;
// Determine number of tracks
fseek(f, 0, SEEK_END);
long size = ftell(f);
if (size == NUM_SECTORS_40 * 256 || size == NUM_SECTORS_40 * 257)
desc.num_tracks = 40;
else
desc.num_tracks = 35;
if (has_header_id) {
// Read header ID from image file (last 2 bytes)
fseek(f, -2, SEEK_END);
desc.id1 = getc(f);
desc.id2 = getc(f);
} else {
// Read header ID from BAM (use error_info as buffer)
fseek(f, accum_num_sectors[18] * 256, SEEK_SET);
fread(desc.error_info, 1, 256, f);
desc.id1 = desc.error_info[BAM_DISK_ID];
desc.id2 = desc.error_info[BAM_DISK_ID + 1];
}
// Read error info
memset(desc.error_info, 1, sizeof(desc.error_info));
if (size == NUM_SECTORS_35 * 257) {
fseek(f, NUM_SECTORS_35 * 256, SEEK_SET);
fread(desc.error_info, NUM_SECTORS_35, 1, f);
desc.has_error_info = true;
} else if (size == NUM_SECTORS_40 * 257) {
fseek(f, NUM_SECTORS_40 * 256, SEEK_SET);
fread(desc.error_info, NUM_SECTORS_40, 1, f);
desc.has_error_info = true;
} else
desc.has_error_info = false;
return true;
}
static bool parse_x64_file(FILE *f, image_file_desc &desc)
{
desc.type = TYPE_X64;
desc.header_size = 64;
// Read number of tracks
fseek(f, 7, SEEK_SET);
desc.num_tracks = getc(f);
if (desc.num_tracks < 35 || desc.num_tracks > 40)
return false;
// Read header ID from BAM (use error_info as buffer)
fseek(f, desc.header_size + accum_num_sectors[18] * 256, SEEK_SET);
fread(desc.error_info, 1, 256, f);
desc.id1 = desc.error_info[BAM_DISK_ID];
desc.id2 = desc.error_info[BAM_DISK_ID + 1];
// .x64 files have no error info
memset(desc.error_info, 1, sizeof(desc.error_info));
desc.has_error_info = false;
return true;
}
static bool parse_image_file(FILE *f, image_file_desc &desc)
{
// Read header
uint8 header[64];
fread(header, 1, sizeof(header), f);
// Determine file size
fseek(f, 0, SEEK_END);
long size = ftell(f);
// Determine file type and fill in image_file_desc structure
if (is_x64_file(header, size))
return parse_x64_file(f, desc);
else if (is_d64_file(header, size))
return parse_d64_file(f, desc, false);
else if (is_ed64_file(header, size))
return parse_d64_file(f, desc, true);
else
return false;
}
/*
* Read directory of disk image file into (empty) c64_dir_entry vector,
* returns false on error
*/
bool ReadImageDirectory(const char *path, vector<c64_dir_entry> &vec)
{
bool result = false;
// Open file
FILE *f = open_image_file(path, false);
if (f) {
int num_dir_blocks = 0;
// Determine file type and fill in image_file_desc structure
image_file_desc desc;
if (!parse_image_file(f, desc))
goto done;
// Scan all directory blocks
uint8 dir[256];
dir[DIR_NEXT_TRACK] = DIR_TRACK;
dir[DIR_NEXT_SECTOR] = 1;
while (dir[DIR_NEXT_TRACK] && num_dir_blocks < num_sectors[DIR_TRACK]) {
if (read_sector(f, desc, dir[DIR_NEXT_TRACK], dir[DIR_NEXT_SECTOR], dir) != ERR_OK)
break;
num_dir_blocks++;
// Scan all 8 entries of a block
uint8 *de = dir + DIR_ENTRIES;
for (int j=0; j<8; j++, de+=SIZEOF_DE) {
// Skip empty entries
if (de[DE_TYPE] == 0)
continue;
// Convert file name (strip everything after and including the first trailing space)
uint8 name_buf[17];
memcpy(name_buf, de + DE_NAME, 16);
name_buf[16] = 0;
uint8 *p = (uint8 *)memchr(name_buf, 0xa0, 16);
if (p)
*p = 0;
// Convert file type
int type = de[DE_TYPE] & 7;
if (type > 4)
type = FTYPE_UNKNOWN;
// Read start address
uint8 sa_lo = 0, sa_hi = 0;
uint8 buf[256];
if (read_sector(f, desc, de[DE_TRACK], de[DE_SECTOR], buf) == ERR_OK) {
sa_lo = buf[2];
sa_hi = buf[3];
}
// Add entry
vec.push_back(c64_dir_entry(name_buf, type, !(de[DE_TYPE] & 0x80), de[DE_TYPE] & 0x40, ((de[DE_NUM_BLOCKS_H] << 8) + de[DE_NUM_BLOCKS_L]) * 254, 0, sa_lo, sa_hi));
}
}
result = true;
done: fclose(f);
}
return result;
}
/*
* Create new blank disk image file, returns false on error
*/
bool CreateImageFile(const char *path)
{
// Open file for writing
FILE *f = fopen(path, "wb");
if (f == NULL)
return false;
// Create descriptor
image_file_desc desc;
desc.type = TYPE_D64;
desc.header_size = 0;
desc.num_tracks = 35;
desc.id1 = 'F';
desc.id1 = 'R';
memset(desc.error_info, 1, sizeof(desc.error_info));
desc.has_error_info = false;
// Format image file
if (!format_image(f, desc, true, 'F', 'R', (uint8 *)"D64 FILE", 8)) {
fclose(f);
remove(path);
return false;
}
// Close file
fclose(f);
return true;
}
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