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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/ptr.h"
#include "common/file.h"
#include "common/debug.h"
#ifndef ADL_DISK_H
#define ADL_DISK_H
namespace Common {
class SeekableReadStream;
class String;
}
namespace Adl {
// Used for disk image detection
int32 computeMD5(const Common::FSNode &node, Common::String &md5, uint32 md5Bytes);
class DataBlock {
public:
virtual ~DataBlock() { }
virtual Common::SeekableReadStream *createReadStream() const = 0;
};
typedef Common::SharedPtr<DataBlock> DataBlockPtr;
typedef Common::ScopedPtr<Common::SeekableReadStream> StreamPtr;
class Files {
public:
virtual ~Files() { }
virtual const DataBlockPtr getDataBlock(const Common::String &filename, uint offset = 0) const = 0;
virtual Common::SeekableReadStream *createReadStream(const Common::String &filename, uint offset = 0) const = 0;
protected:
class DataBlock : public Adl::DataBlock {
public:
DataBlock(const Files *files, const Common::String &filename, uint offset) :
_files(files),
_filename(filename),
_offset(offset) { }
Common::SeekableReadStream *createReadStream() const override {
return _files->createReadStream(_filename, _offset);
}
private:
const Common::String _filename;
uint _offset;
const Files *_files;
};
};
class DiskImage {
public:
DiskImage() :
_stream(nullptr),
_tracks(0),
_sectorsPerTrack(0),
_bytesPerSector(0),
_sectorLimit(0),
_firstSector(0) { }
~DiskImage() {
delete _stream;
}
bool open(const Common::String &filename);
const DataBlockPtr getDataBlock(uint track, uint sector, uint offset = 0, uint size = 0) const;
Common::SeekableReadStream *createReadStream(uint track, uint sector, uint offset = 0, uint size = 0, uint sectorsUsed = 0) const;
void setSectorLimit(uint sectorLimit) { _sectorLimit = sectorLimit; } // Maximum number of sectors to read per track before stepping
uint getBytesPerSector() const { return _bytesPerSector; }
uint getSectorsPerTrack() const { return _sectorsPerTrack; }
uint getTracks() const { return _tracks; }
protected:
class DataBlock : public Adl::DataBlock {
public:
DataBlock(const DiskImage *disk, uint track, uint sector, uint offset, uint size, uint sectorLimit) :
_track(track),
_sector(sector),
_offset(offset),
_size(size),
_sectorLimit(sectorLimit),
_disk(disk) { }
Common::SeekableReadStream *createReadStream() const override {
return _disk->createReadStream(_track, _sector, _offset, _size, _sectorLimit);
}
private:
uint _track, _sector, _offset, _size;
uint _sectorLimit;
const DiskImage *_disk;
};
Common::SeekableReadStream *_stream;
uint _tracks, _sectorsPerTrack, _bytesPerSector, _firstSector;
uint _sectorLimit;
};
// Data in plain files
class Files_Plain : public Files {
public:
const DataBlockPtr getDataBlock(const Common::String &filename, uint offset = 0) const override;
Common::SeekableReadStream *createReadStream(const Common::String &filename, uint offset = 0) const override;
};
// Data in files contained in Apple DOS 3.3 disk image
class Files_AppleDOS : public Files {
public:
Files_AppleDOS();
~Files_AppleDOS();
bool open(const Common::String &filename, uint trackVTOC = 17);
const DataBlockPtr getDataBlock(const Common::String &filename, uint offset = 0) const override;
Common::SeekableReadStream *createReadStream(const Common::String &filename, uint offset = 0) const override;
private:
enum FileType {
kFileTypeText = 0,
kFileTypeAppleSoft = 2,
kFileTypeBinary = 4
};
enum {
kSectorSize = 256,
kFilenameLen = 30
};
struct TrackSector {
byte track;
byte sector;
};
struct TOCEntry {
byte type;
uint16 totalSectors;
Common::Array<TrackSector> sectors;
};
void readVTOC(uint trackVTOC);
void readSectorList(TrackSector start, Common::Array<TrackSector> &list);
Common::SeekableReadStream *createReadStreamText(const TOCEntry &entry) const;
Common::SeekableReadStream *createReadStreamBinary(const TOCEntry &entry) const;
DiskImage *_disk;
Common::HashMap<Common::String, TOCEntry> _toc;
};
// On the Apple II, sector headers contain a disk volume number. This number
// is used by ADL multi-disk games. The PC port has the disk volume number
// as the first data byte of every sector that contains game data. We need
// to skip this number as we read in the data. Additionally, the data is now
// prefixed with an uint16 containing the data size.
class DataBlock_PC : public DataBlock {
public:
DataBlock_PC(DiskImage *disk, byte track, byte sector, uint16 offset = 0) :
_disk(disk),
_track(track),
_sector(sector),
_offset(offset) { }
virtual ~DataBlock_PC() { }
Common::SeekableReadStream *createReadStream() const override;
private:
void read(Common::SeekableReadStream &stream, byte *const dataPtr, const uint32 size) const;
DiskImage *_disk;
byte _track, _sector;
uint16 _offset;
};
} // End of namespace Adl
#endif
|
