1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
// license:BSD-3-Clause
// copyright-holders:Dirk Best
/***************************************************************************
APRIDISK
Disk image format for the ACT Apricot
***************************************************************************/
#include "apridisk.h"
#include "ioprocs.h"
#include "multibyte.h"
#include "osdcore.h" // osd_printf_error
apridisk_format::apridisk_format()
{
}
const char *apridisk_format::name() const noexcept
{
return "apridisk";
}
const char *apridisk_format::description() const noexcept
{
return "APRIDISK disk image";
}
const char *apridisk_format::extensions() const noexcept
{
return "dsk";
}
int apridisk_format::identify(util::random_read &io, uint32_t form_factor, const std::vector<uint32_t> &variants) const
{
uint8_t header[APR_HEADER_SIZE];
auto const [err, actual] = read_at(io, 0, header, APR_HEADER_SIZE);
if (err || (APR_HEADER_SIZE != actual))
return 0;
const char magic[] = "ACT Apricot disk image\x1a\x04";
if (memcmp(header, magic, sizeof(magic) - 1) == 0)
return 100;
else
return 0;
}
bool apridisk_format::load(util::random_read &io, uint32_t form_factor, const std::vector<uint32_t> &variants, floppy_image &image) const
{
desc_pc_sector sectors[80][2][18];
std::unique_ptr<uint8_t []> sector_data(new uint8_t [MAX_SECTORS * SECTOR_SIZE]);
uint8_t *data_ptr = sector_data.get();
int track_count = 0, head_count = 0, sector_count = 0;
uint64_t file_size;
if (io.length(file_size))
return false;
uint64_t file_offset = APR_HEADER_SIZE;
while (file_offset < file_size)
{
// read sector header
uint8_t sector_header[16];
read_at(io, file_offset, sector_header, 16); // FIXME: check for errors and premature EOF
uint32_t type = get_u32le(§or_header[0]);
uint16_t compression = get_u16le(§or_header[4]);
uint16_t header_size = get_u16le(§or_header[6]);
uint32_t data_size = get_u32le(§or_header[8]);
file_offset += header_size;
switch (type)
{
case APR_SECTOR:
uint8_t head = sector_header[12];
uint8_t sector = sector_header[13];
uint8_t track = (uint8_t) get_u16le(§or_header[14]);
track_count = std::max(track_count, int(unsigned(track)));
head_count = std::max(head_count, int(unsigned(head)));
sector_count = std::max(sector_count, int(unsigned(sector)));
// build sector info
sectors[track][head][sector - 1].head = head;
sectors[track][head][sector - 1].sector = sector;
sectors[track][head][sector - 1].track = track;
sectors[track][head][sector - 1].size = SECTOR_SIZE >> 8;
sectors[track][head][sector - 1].actual_size = SECTOR_SIZE;
sectors[track][head][sector - 1].deleted = false;
sectors[track][head][sector - 1].bad_crc = false;
// read sector data
switch (compression)
{
case APR_COMPRESSED:
{
uint8_t comp[3];
read_at(io, file_offset, comp, 3); // FIXME: check for errors and premature EOF
uint16_t length = get_u16le(&comp[0]);
if (length != SECTOR_SIZE)
{
osd_printf_error("apridisk_format: Invalid compression length %04x\n", length);
return false;
}
memset(data_ptr, comp[2], SECTOR_SIZE);
}
break;
case APR_UNCOMPRESSED:
read_at(io, file_offset, data_ptr, SECTOR_SIZE); // FIXME: check for errors and premature EOF
break;
default:
osd_printf_error("apridisk_format: Invalid compression %04x\n", compression);
return false;
}
sectors[track][head][sector - 1].data = data_ptr;
data_ptr += SECTOR_SIZE;
break;
}
file_offset += data_size;
}
// track/head index are zero-based, so increase the final count by 1
track_count++;
head_count++;
int cell_count = (sector_count == 18 ? 200000 : 100000);
// now build our final track info
for (int track = 0; track < track_count; track++)
for (int head = 0; head < head_count; head++)
build_pc_track_mfm(track, head, image, cell_count, sector_count, sectors[track][head], 84, 80, 50, 22);
return true;
}
bool apridisk_format::supports_save() const noexcept
{
return false;
}
const apridisk_format FLOPPY_APRIDISK_FORMAT;
|