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Adds read-only WOZ 2 support.

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This commit is contained in:
Thomas Harte 2020-07-15 19:15:03 -04:00
parent ab20a23f2b
commit d065d6d98f
2 changed files with 58 additions and 16 deletions
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71
Storage/Disk/DiskImage/Formats/WOZ.cpp
View File

@ -18,11 +18,21 @@ using namespace Storage::Disk;
WOZ::WOZ(const std::string &file_name) :
file_(file_name) {
const char signature[8] = {
constexpr const char signature1[8] = {
'W', 'O', 'Z', '1',
char(0xff), 0x0a, 0x0d, 0x0a
};
if(!file_.check_signature(signature, 8)) throw Error::InvalidFormat;
constexpr const char signature2[8] = {
'W', 'O', 'Z', '2',
char(0xff), 0x0a, 0x0d, 0x0a
};
const bool isWoz1 = file_.check_signature(signature1, 8);
file_.seek(0, SEEK_SET);
const bool isWoz2 = file_.check_signature(signature2, 8);
if(!isWoz1 && !isWoz2) throw Error::InvalidFormat;
type_ = isWoz2 ? Type::WOZ2 : Type::WOZ1;
// Get the file's CRC32.
const uint32_t crc = file_.get32le();
@ -52,13 +62,22 @@ WOZ::WOZ(const std::string &file_name) :
switch(chunk_id) {
case CK("INFO"): {
const uint8_t version = file_.get8();
if(version != 1) break;
if(version > 2) break;
is_3_5_disk_ = file_.get8() == 2;
is_read_only_ = file_.get8() == 1;
/* Ignored:
1 byte: Synchronized; 1 = Cross track sync was used during imaging.
1 byte: Cleaned; 1 = MC3470 fake bits have been removed.
32 bytes: Cretor; a UTF-8 string.
/*
Ignored:
1 byte: Synchronized; 1 = Cross track sync was used during imaging.
1 byte: Cleaned; 1 = MC3470 fake bits have been removed.
32 bytes: Creator; a UTF-8 string.
And, if version 2, following the creator:
1 byte number of disk sides
1 byte boot sector format
1 byte optimal bit timing
2 bytes compatible hardware
2 bytes minimum required RAM
2 bytes largest track
*/
} break;
@ -99,11 +118,15 @@ long WOZ::file_offset(Track::Address address) {
if(track_map_[table_position] == 0xff) return NoSuchTrack;
// Seek to the real track.
return tracks_offset_ + track_map_[table_position] * 6656;
switch(type_) {
case Type::WOZ1: return tracks_offset_ + track_map_[table_position] * 6656;
default:
case Type::WOZ2: return tracks_offset_ + track_map_[table_position] * 8;
}
}
std::shared_ptr<Track> WOZ::get_track_at_position(Track::Address address) {
long offset = file_offset(address);
const long offset = file_offset(address);
if(offset == NoSuchTrack) return nullptr;
// Seek to the real track.
@ -113,18 +136,34 @@ std::shared_ptr<Track> WOZ::get_track_at_position(Track::Address address) {
std::lock_guard lock_guard(file_.get_file_access_mutex());
file_.seek(offset, SEEK_SET);
// In WOZ a track is up to 6646 bytes of data, followed by a two-byte record of the
// number of bytes that actually had data in them, then a two-byte count of the number
// of bits that were used. Other information follows but is not intended for emulation.
track_contents = file_.read(6646);
file_.seek(2, SEEK_CUR);
number_of_bits = std::min(file_.get16le(), uint16_t(6646*8));
switch(type_) {
case Type::WOZ1:
// In WOZ 1, a track is up to 6646 bytes of data, followed by a two-byte record of the
// number of bytes that actually had data in them, then a two-byte count of the number
// of bits that were used. Other information follows but is not intended for emulation.
track_contents = file_.read(6646);
file_.seek(2, SEEK_CUR);
number_of_bits = std::min(file_.get16le(), uint16_t(6646*8));
break;
case Type::WOZ2: {
// In WOZ 2 an extra level of indirection allows for variable track sizes.
const uint16_t starting_block = file_.get16le();
file_.seek(2, SEEK_CUR); // Skip the block count; the amount of data to read is implied by the number of bits.
number_of_bits = file_.get32le();
file_.seek(starting_block * 512, SEEK_SET);
track_contents = file_.read((number_of_bits + 7) >> 3);
} break;
}
}
return std::make_shared<PCMTrack>(PCMSegment(number_of_bits, track_contents));
}
void WOZ::set_tracks(const std::map<Track::Address, std::shared_ptr<Track>> &tracks) {
if(type_ == Type::WOZ2) return;
for(const auto &pair: tracks) {
// Decode the track and store, patching into the post_crc_contents_.
auto segment = Storage::Disk::track_serialisation(*pair.second, Storage::Time(1, 50000));
@ -155,5 +194,5 @@ void WOZ::set_tracks(const std::map<Track::Address, std::shared_ptr<Track>> &tra
}
bool WOZ::get_is_read_only() {
return file_.get_is_known_read_only();
return file_.get_is_known_read_only() || is_read_only_ || type_ == Type::WOZ2; // WOZ 2 disks are currently read only.
}

3
Storage/Disk/DiskImage/Formats/WOZ.hpp
View File

@ -34,6 +34,9 @@ class WOZ: public DiskImage {
private:
Storage::FileHolder file_;
enum class Type {
WOZ1, WOZ2
} type_ = Type::WOZ1;
bool is_read_only_ = false;
bool is_3_5_disk_ = false;
uint8_t track_map_[160];