6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2025-04-05 04:37:41 +00:00
Code Issues Projects Releases Wiki Activity

Merge pull request #724 from TomHarte/STX2

Browse Source 
Adds some support for the STX file format.
This commit is contained in:
Thomas Harte 2020-01-12 22:28:50 -05:00 committed by GitHub
commit 80fcf5b5c0
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 556 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Analyser/Static/StaticAnalyser.cpp
View File

@ -47,6 +47,7 @@
#include "../../Storage/Disk/DiskImage/Formats/OricMFMDSK.hpp"
#include "../../Storage/Disk/DiskImage/Formats/SSD.hpp"
#include "../../Storage/Disk/DiskImage/Formats/ST.hpp"
#include "../../Storage/Disk/DiskImage/Formats/STX.hpp"
#include "../../Storage/Disk/DiskImage/Formats/WOZ.hpp"
// Mass Storage Devices (i.e. usually, hard disks)
@ -147,6 +148,7 @@ static Media GetMediaAndPlatforms(const std::string &file_name, TargetPlatform::
Format("sms", result.cartridges, Cartridge::BinaryDump, TargetPlatform::Sega) // SMS
Format("ssd", result.disks, Disk::DiskImageHolder<Storage::Disk::SSD>, TargetPlatform::Acorn) // SSD
Format("st", result.disks, Disk::DiskImageHolder<Storage::Disk::ST>, TargetPlatform::AtariST) // ST
Format("stx", result.disks, Disk::DiskImageHolder<Storage::Disk::STX>, TargetPlatform::AtariST) // STX
Format("tap", result.tapes, Tape::CommodoreTAP, TargetPlatform::Commodore) // TAP (Commodore)
Format("tap", result.tapes, Tape::OricTAP, TargetPlatform::Oric) // TAP (Oric)
Format("tsx", result.tapes, Tape::TZX, TargetPlatform::MSX) // TSX

1
Components/1770/1770.cpp
View File

@ -336,6 +336,7 @@ void WD1770::posit_event(int new_event_type) {
READ_ID();
if(index_hole_count_ == 6) {
LOG("Nothing found to verify");
update_status([] (Status &status) {
status.seek_error = true;
});

6
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
View File

@ -368,6 +368,7 @@
4B7A90ED20410A85008514A2 /* StaticAnalyser.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7A90EC20410A85008514A2 /* StaticAnalyser.cpp */; };
4B7BA03023C2B19C00B98D9E /* Jasmin.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7BA02E23C2B19B00B98D9E /* Jasmin.cpp */; };
4B7BA03123C2B19C00B98D9E /* Jasmin.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7BA02E23C2B19B00B98D9E /* Jasmin.cpp */; };
4B7BA03423C58B1F00B98D9E /* STX.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7BA03323C58B1E00B98D9E /* STX.cpp */; };
4B7BC7F51F58F27800D1B1B4 /* 6502AllRAM.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B6A4C911F58F09E00E3F787 /* 6502AllRAM.cpp */; };
4B7F188E2154825E00388727 /* MasterSystem.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7F188C2154825D00388727 /* MasterSystem.cpp */; };
4B7F188F2154825E00388727 /* MasterSystem.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7F188C2154825D00388727 /* MasterSystem.cpp */; };
@ -1178,6 +1179,8 @@
4B7A90EC20410A85008514A2 /* StaticAnalyser.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = StaticAnalyser.cpp; sourceTree = "<group>"; };
4B7BA02E23C2B19B00B98D9E /* Jasmin.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = Jasmin.cpp; path = Oric/Jasmin.cpp; sourceTree = "<group>"; };
4B7BA02F23C2B19B00B98D9E /* Jasmin.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; name = Jasmin.hpp; path = Oric/Jasmin.hpp; sourceTree = "<group>"; };
4B7BA03223C58B1E00B98D9E /* STX.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = STX.hpp; sourceTree = "<group>"; };
4B7BA03323C58B1E00B98D9E /* STX.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = STX.cpp; sourceTree = "<group>"; };
4B7F188C2154825D00388727 /* MasterSystem.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = MasterSystem.cpp; sourceTree = "<group>"; };
4B7F188D2154825D00388727 /* MasterSystem.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = MasterSystem.hpp; sourceTree = "<group>"; };
4B7F1895215486A100388727 /* StaticAnalyser.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = StaticAnalyser.hpp; sourceTree = "<group>"; };
@ -2264,6 +2267,7 @@
4B4518971F75FD1B00926311 /* OricMFMDSK.cpp */,
4B4518991F75FD1B00926311 /* SSD.cpp */,
4BE0A3EC237BB170002AB46F /* ST.cpp */,
4B7BA03323C58B1E00B98D9E /* STX.cpp */,
4B6ED2EE208E2F8A0047B343 /* WOZ.cpp */,
4B45188E1F75FD1B00926311 /* AcornADF.hpp */,
4B0333AE2094081A0050B93D /* AppleDSK.hpp */,
@ -2280,6 +2284,7 @@
4B4518981F75FD1B00926311 /* OricMFMDSK.hpp */,
4B45189A1F75FD1B00926311 /* SSD.hpp */,
4BE0A3ED237BB170002AB46F /* ST.hpp */,
4B7BA03223C58B1E00B98D9E /* STX.hpp */,
4B6ED2EF208E2F8A0047B343 /* WOZ.hpp */,
4BFDD7891F7F2DB4008579B9 /* Utility */,
);
@ -4535,6 +4540,7 @@
4BBC951E1F368D83008F4C34 /* i8272.cpp in Sources */,
4B89449520194CB3007DE474 /* MachineForTarget.cpp in Sources */,
4B4A76301DB1A3FA007AAE2E /* AY38910.cpp in Sources */,
4B7BA03423C58B1F00B98D9E /* STX.cpp in Sources */,
4B6A4C991F58F09E00E3F787 /* 6502Base.cpp in Sources */,
4B98A05E1FFAD3F600ADF63B /* CSROMFetcher.mm in Sources */,
4B7F188E2154825E00388727 /* MasterSystem.cpp in Sources */,

2
OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme
View File

@ -67,7 +67,7 @@
</Testables>
</TestAction>
<LaunchAction
buildConfiguration = "Debug"
buildConfiguration = "Release"
selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
enableASanStackUseAfterReturn = "YES"

1
OSBindings/Mac/Clock Signal/Info.plist
View File

@ -394,6 +394,7 @@
<array>
<string>msa</string>
<string>st</string>
<string>stx</string>
</array>
<key>CFBundleTypeIconFile</key>
<string>floppy35.png</string>

22
Storage/Disk/DPLL/DigitalPhaseLockedLoop.hpp
View File

@ -83,7 +83,7 @@ template <typename BitHandler, size_t length_of_history = 3> class DigitalPhaseL
total_spacing_ -= offset_history_[offset_history_pointer_].spacing;
// Fill in the new fields.
const auto multiple = (new_offset + (clocks_per_bit_ >> 1)) / clocks_per_bit_;
const auto multiple = std::max((new_offset + (clocks_per_bit_ >> 1)) / clocks_per_bit_, Cycles::IntType(1));
offset_history_[offset_history_pointer_].divisor = multiple;
offset_history_[offset_history_pointer_].spacing = new_offset;
@ -94,19 +94,19 @@ template <typename BitHandler, size_t length_of_history = 3> class DigitalPhaseL
// Advance the write slot.
offset_history_pointer_ = (offset_history_pointer_ + 1) % offset_history_.size();
#ifndef NDEBUG
Cycles::IntType td = 0, ts = 0;
for(auto offset: offset_history_) {
td += offset.divisor;
ts += offset.spacing;
}
assert(ts == total_spacing_);
assert(td == total_divisor_);
#endif
// In net: use an unweighted average of the stored offsets to compute current window size,
// bucketing them by rounding to the nearest multiple of the base clocks per bit
window_length_ = total_spacing_ / total_divisor_;
#ifndef NDEBUG
bool are_all_filled = true;
for(auto offset: offset_history_) {
if(offset.spacing == 1) {
are_all_filled = false;
break;
}
}
assert(!are_all_filled || (window_length_ >= ((clocks_per_bit_ * 9) / 10) && window_length_ <= ((clocks_per_bit_ * 11) / 10)));
#endif
// Also apply a difference to phase, use a simple spring mechanism as a lowpass filter.
const auto error = new_phase - (window_length_ >> 1);

478
Storage/Disk/DiskImage/Formats/STX.cpp Normal file
View File

@ -0,0 +1,478 @@
//
// STX.cpp
// Clock Signal
//
// Created by Thomas Harte on 13/11/2019.
// Copyright © 2019 Thomas Harte. All rights reserved.
//
#include "STX.hpp"
#include "../../Encodings/MFM/Constants.hpp"
#include "../../Encodings/MFM/Shifter.hpp"
#include "../../Encodings/MFM/Encoder.hpp"
#include "../../Track/PCMTrack.hpp"
#include "Utility/ImplicitSectors.hpp"
#include <array>
#include <cstdlib>
#include <cstring>
using namespace Storage::Disk;
namespace {
class TrackConstructor {
public:
constexpr static uint16_t NoFirstOffset = std::numeric_limits<uint16_t>::max();
struct Sector {
// Records explicitly present in the sector table.
uint32_t data_offset = 0;
size_t bit_position = 0;
uint16_t data_duration = 0;
std::array<uint8_t, 6> address = {0, 0, 0, 0, 0, 0};
uint8_t status = 0;
// Other facts that will either be supplied by the STX or which
// will be empty.
std::vector<uint8_t> fuzzy_mask;
std::vector<uint8_t> contents;
std::vector<uint16_t> timing;
// Accessors.
/// @returns The byte size of this sector, according to its address mark.
uint32_t data_size() const {
return uint32_t(128 << address[3]);
}
/// @returns The byte stream this sector address would produce if a WD read track command were to observe it.
std::vector<uint8_t> get_track_address_image() const {
return track_encoding(address.begin(), address.begin() + 4, {0xa1, 0xa1, 0xfe});
}
/// @returns The byte stream this sector data would produce if a WD read track command were to observe it.
std::vector<uint8_t> get_track_data_image() const {
return track_encoding(contents.begin(), contents.end(), {0xa1, 0xa1, 0xfb});
}
private:
/// @returns The effect of encoding @c prefix followed by the bytes from @c begin to @c end as MFM data and then decoding them as if
/// observed by a WD read track command.
template <typename T> static std::vector<uint8_t> track_encoding(T begin, T end, std::initializer_list<uint8_t> prefix) {
std::vector<uint8_t> result;
result.reserve(size_t(end - begin) + prefix.size());
PCMSegment segment;
std::unique_ptr<Storage::Encodings::MFM::Encoder> encoder = Storage::Encodings::MFM::GetMFMEncoder(segment.data);
// Encode prefix.
for(auto c: prefix) {
encoder->add_byte(c);
}
// Encode body.
while(begin != end) {
encoder->add_byte(*begin);
++begin;
}
// Decode, obeying false syncs.
using Shifter = Storage::Encodings::MFM::Shifter;
Shifter shifter;
shifter.set_should_obey_syncs(true);
// Add whatever comes from the track.
for(auto bit: segment.data) {
shifter.add_input_bit(int(bit));
if(shifter.get_token() != Shifter::None) {
result.push_back(shifter.get_byte());
}
}
return result;
}
};
TrackConstructor(const std::vector<uint8_t> &track_data, const std::vector<Sector> &sectors, size_t track_size, uint16_t first_sync) :
track_data_(track_data), sectors_(sectors), track_size_(track_size), first_sync_(first_sync) {
}
std::shared_ptr<PCMTrack> get_track() {
// If no contents are supplied, return an unformatted track.
if(sectors_.empty() && track_data_.empty()) {
return nullptr;
}
// If no sectors are on this track, just encode the track data. STX allows speed
// changes and fuzzy bits in sectors only.
if(sectors_.empty()) {
PCMSegment segment;
std::unique_ptr<Storage::Encodings::MFM::Encoder> encoder = Storage::Encodings::MFM::GetMFMEncoder(segment.data);
for(auto c: track_data_) {
encoder->add_byte(c);
}
return std::make_shared<PCMTrack>(segment);
}
// Otherwise, seek to encode the sectors, using the track data to
// fill in the gaps (if provided).
std::unique_ptr<Storage::Encodings::MFM::Encoder> encoder;
std::unique_ptr<PCMSegment> segment;
// To reconcile the list of sectors with the WD get track-style track image,
// use sector bodies as definitive and refer to the track image for in-fill.
auto track_position = track_data_.begin();
const auto address_mark = {0xa1, 0xa1, 0xfe};
const auto track_mark = {0xa1, 0xa1, 0xfb};
struct Location {
enum Type {
Address, Data
} type;
std::vector<uint8_t>::const_iterator position;
const Sector &sector;
Location(Type type, std::vector<uint8_t>::const_iterator position, const Sector &sector) : type(type), position(position), sector(sector) {}
};
std::vector<Location> locations;
for(const auto &sector: sectors_) {
{
// Find out what the address would look like, if found in a read track.
const auto track_address = sector.get_track_address_image();
// Try to locate the header within the track image; if it can't be found then settle for
// the next thing that looks like a header of any sort.
auto address_position = std::search(track_position, track_data_.end(), track_address.begin(), track_address.end());
if(address_position == track_data_.end()) {
address_position = std::search(track_position, track_data_.end(), address_mark.begin(), address_mark.end());
}
// Stop now if there's nowhere obvious to put this sector.
if(address_position == track_data_.end()) break;
locations.emplace_back(Location::Address, address_position, sector);
// Advance the track position.
track_position = address_position;
}
// Do much the same thing for the data, if it exists.
if(!(sector.status & 0x10)) {
const auto track_data = sector.get_track_data_image();
auto data_position = std::search(track_position, track_data_.end(), track_data.begin(), track_data.end());
if(data_position == track_data_.end()) {
data_position = std::search(track_position, track_data_.end(), track_mark.begin(), track_mark.end());
}
if(data_position == track_data_.end()) break;
locations.emplace_back(Location::Data, data_position, sector);
track_position = data_position;
}
}
// Write out, being wary of potential overlapping sectors, and copying from track_data_ to fill in gaps.
auto location = locations.begin();
track_position = track_data_.begin();
while(location != locations.end()) {
// Just create an encoder if one doesn't exist. TODO: factor in data rate.
if(!encoder) {
segment.reset(new PCMSegment);
encoder = Storage::Encodings::MFM::GetMFMEncoder(segment->data);
}
// Advance to location.position.
while(track_position != location->position) {
encoder->add_byte(*track_position);
++track_position;
}
// Write the relevant mark and fill in a default number of bytes to write.
size_t bytes_to_write;
switch(location->type) {
default:
case Location::Address:
encoder->add_ID_address_mark();
bytes_to_write = 6;
break;
case Location::Data:
if(location->sector.status & 0x20)
encoder->add_deleted_data_address_mark();
else
encoder->add_data_address_mark();
bytes_to_write = location->sector.data_size() + 2;
break;
}
track_position += 3;
// Decide how much data to write for real; this [partially] allows for overlapping sectors.
auto next_location = location + 1;
if(next_location != locations.end()) {
bytes_to_write = std::min(bytes_to_write, size_t(next_location->position - track_position));
}
// Skip that many bytes from the underlying track image.
track_position += ssize_t(bytes_to_write);
// Write bytes.
switch(location->type) {
default:
case Location::Address:
for(size_t c = 0; c < bytes_to_write; ++c)
encoder->add_byte(location->sector.address[c]);
break;
case Location::Data: {
const auto body_bytes = std::min(bytes_to_write, size_t(location->sector.data_size()));
for(size_t c = 0; c < body_bytes; ++c)
encoder->add_byte(location->sector.contents[c]);
// Add a CRC only if it fits (TODO: crop if necessary?).
if(bytes_to_write & 127) {
encoder->add_crc((location->sector.status & 0x18) == 0x10);
}
} break;
}
// Advance location.
++location;
}
// Write anything remaining from the track image.
while(track_position < track_data_.end()) {
encoder->add_byte(*track_position);
++track_position;
}
// Write generic padding up until the specified track size.
while(segment->data.size() < track_size_ * 16) {
encoder->add_byte(0x4e);
}
// Pad out to the minimum size a WD can actually make sense of.
// I've no idea why it's valid for tracks to be shorter than this,
// so likely I'm suffering a comprehansion deficiency.
// TODO: determine why this isn't correct (or, possibly, is).
while(segment->data.size() < 5750 * 16) {
encoder->add_byte(0x4e);
}
return std::make_shared<PCMTrack>(*segment);
}
private:
const std::vector<uint8_t> &track_data_;
const std::vector<Sector> &sectors_;
const size_t track_size_;
const uint16_t first_sync_;
};
}
STX::STX(const std::string &file_name) : file_(file_name) {
// Require that this be a version 3 Pasti.
if(!file_.check_signature("RSY", 4)) throw Error::InvalidFormat;
if(file_.get16le() != 3) throw Error::InvalidFormat;
// Skip: tool used, 2 reserved bytes.
file_.seek(4, SEEK_CUR);
// Skip the track count, test for a new-style encoding, skip a reserved area.
file_.seek(1, SEEK_CUR);
is_new_format_ = file_.get8() == 2;
file_.seek(4, SEEK_CUR);
// Set all tracks absent.
memset(offset_by_track_, 0, sizeof(offset_by_track_));
// Parse the tracks table to fill in offset_by_track_. The only available documentation
// for STX is unofficial and makes no promise about track order. Hence the bucket sort,
// effectively putting them into track order.
//
// Track descriptor layout:
//
// 0 4 Record size.
// 4 4 Number of bytes in fuzzy mask record.
// 8 2 Number of sectors on track.
// 10 2 Track flags.
// 12 2 Total number of bytes on track.
// 14 1 Track number (b7 = side, b0-b6 = track).
// 15 1 Track type.
track_count_ = 0;
head_count_ = 1;
while(true) {
const long offset = file_.tell();
const uint32_t size = file_.get32le();
if(file_.eof()) break;
// Skip fields other than track position, then fill in table position and advance.
file_.seek(10, SEEK_CUR);
const uint8_t track_position = file_.get8();
offset_by_track_[track_position] = offset;
// Update the maximum surface dimensions.
track_count_ = std::max(track_count_, track_position & 0x7f);
head_count_ = std::max(head_count_, ((track_position & 0x80) >> 6));
// Seek next track start.
file_.seek(offset + size, SEEK_SET);
}
}
HeadPosition STX::get_maximum_head_position() {
return HeadPosition(track_count_ + 1); // Same issue as MSA; must fix!
}
int STX::get_head_count() {
return head_count_;
}
std::shared_ptr<::Storage::Disk::Track> STX::get_track_at_position(::Storage::Disk::Track::Address address) {
// These images have two sides, at most.
if(address.head > 1) return nullptr;
// If no track was found, there's nothing to do here.
const int track_index = (address.head * 0x80) + address.position.as_int();
if(!offset_by_track_[track_index]) return nullptr;
// Seek to the track (skipping the record size field).
file_.seek(offset_by_track_[track_index] + 4, SEEK_SET);
// Grab the track description.
const uint32_t fuzzy_size = file_.get32le();
const uint16_t sector_count = file_.get16le();
const uint16_t flags = file_.get16le();
const size_t track_length = file_.get16le();
file_.seek(2, SEEK_CUR); // Skip track type; despite being named, it's apparently unused.
// If this is a trivial .ST-style sector dump, life is easy.
if(!(flags & 1)) {
const auto sector_contents = file_.read(sector_count * 512);
return track_for_sectors(sector_contents.data(), sector_count, uint8_t(address.position.as_int()), uint8_t(address.head), 1, 2, true);
}
// Grab sector records, if provided.
std::vector<TrackConstructor::Sector> sectors;
std::vector<uint8_t> track_data;
uint16_t first_sync = TrackConstructor::NoFirstOffset;
// Sector records come first.
for(uint16_t c = 0; c < sector_count; ++c) {
sectors.emplace_back();
sectors.back().data_offset = file_.get32le();
sectors.back().bit_position = file_.get16le();
sectors.back().data_duration = file_.get16le();
file_.read(sectors.back().address);
sectors.back().status = file_.get8();
file_.seek(1, SEEK_CUR);
}
// If fuzzy masks are specified, attach them to their corresponding sectors.
if(fuzzy_size) {
uint32_t fuzzy_bytes_read = 0;
for(auto &sector: sectors) {
// Check for the fuzzy bit mask; if it's not set then
// there's nothing for this sector.
if(!(sector.status & 0x80)) continue;
// Make sure there are enough bytes left.
const uint32_t expected_bytes = sector.data_size();
if(fuzzy_bytes_read + expected_bytes > fuzzy_size) break;
// Okay, there are, so read them.
sector.fuzzy_mask = file_.read(expected_bytes);
fuzzy_bytes_read += expected_bytes;
}
// It should be true that the number of fuzzy masks caused
// exactly the correct number of fuzzy bytes to be read.
// But, just in case, check and possibly skip some.
file_.seek(long(fuzzy_size) - fuzzy_bytes_read, SEEK_CUR);
}
// There may or may not be a track image. Grab it if so.
// Grab the read-track-esque track contents, if available.
long sector_start = file_.tell();
if(flags & 0x40) {
// Bit 6 => there is a track to read;
// bit
if(flags & 0x80) {
first_sync = file_.get16le();
const uint16_t image_size = file_.get16le();
track_data = file_.read(image_size);
} else {
const uint16_t image_size = file_.get16le();
track_data = file_.read(image_size);
}
}
// Grab sector contents.
long end_of_data = file_.tell();
for(auto &sector: sectors) {
// If the FDC record-not-found flag is set, there's no sector body to find.
// Otherwise there's a sector body in the file somewhere.
if(!(sector.status & 0x10)) {
file_.seek(sector.data_offset + sector_start, SEEK_SET);
sector.contents = file_.read(sector.data_size());
end_of_data = std::max(end_of_data, file_.tell());
}
}
file_.seek(end_of_data, SEEK_SET);
// Grab timing info if available.
file_.seek(4, SEEK_CUR); // Skip the timing descriptor, as it includes no new information.
for(auto &sector: sectors) {
// Skip any sector with no intra-sector bit width variation.
if(!(sector.status&1)) continue;
const auto timing_record_size = sector.data_size() >> 4; // Use one entry per 16 bytes.
sector.timing.resize(timing_record_size);
if(!is_new_format_) {
// Generate timing records for Macrodos/Speedlock.
// Timing is specified in quarters. Which might or might not be
// quantities of 128 bytes, who knows?
for(size_t c = 0; c < timing_record_size; ++c) {
if(c < (timing_record_size >> 2)) {
sector.timing[c] = 127;
} else if(c < ((timing_record_size*2) >> 2)) {
sector.timing[c] = 133;
} else if(c < ((timing_record_size*3) >> 2)) {
sector.timing[c] = 121;
} else {
sector.timing[c] = 127;
}
}
continue;
}
// This is going to be a new-format record.
for(size_t c = 0; c < timing_record_size; ++c) {
sector.timing[c] = file_.get16be(); // These values are big endian, unlike the rest of the file.
}
}
// Sort the sectors by starting position. It's perfectly possible that they're always
// sorted in STX but, again, the reverse-engineered documentation doesn't make the
// promise, so that's that.
std::sort(sectors.begin(), sectors.end(),
[] (TrackConstructor::Sector &lhs, TrackConstructor::Sector &rhs) {
return lhs.bit_position < rhs.bit_position;
});
/*
Having reached here, the actual stuff of parsing the file structure should be done.
So hand off to the TrackConstructor.
*/
TrackConstructor constructor(track_data, sectors, track_length, first_sync);
return constructor.get_track();
}

50
Storage/Disk/DiskImage/Formats/STX.hpp Normal file
View File

@ -0,0 +1,50 @@
//
// STX.hpp
// Clock Signal
//
// Created by Thomas Harte on 13/11/2019.
// Copyright © 2019 Thomas Harte. All rights reserved.
//
#ifndef STX_hpp
#define STX_hpp
#include "../DiskImage.hpp"
#include "../../../FileHolder.hpp"
namespace Storage {
namespace Disk {
/*!
Provides a @c Disk containing an STX disk image: sector contents plus a bunch of annotations as to sizing,
placement, bit density, fuzzy bits, etc.
*/
class STX: public DiskImage {
public:
/*!
Construct an @c STX containing content from the file with name @c file_name.
@throws Storage::FileHolder::Error::CantOpen if this file can't be opened.
@throws Error::InvalidFormat if the file doesn't appear to contain a .STX format image.
*/
STX(const std::string &file_name);
HeadPosition get_maximum_head_position() final;
int get_head_count() final;
std::shared_ptr<::Storage::Disk::Track> get_track_at_position(::Storage::Disk::Track::Address address) final;
private:
FileHolder file_;
int track_count_;
int head_count_;
bool is_new_format_;
long offset_by_track_[256];
};
}
}
#endif /* STX_hpp */

6
Storage/FileHolder.hpp
View File

@ -10,6 +10,7 @@
#define FileHolder_hpp
#include <sys/stat.h>
#include <array>
#include <cstdio>
#include <cstdint>
#include <mutex>
@ -126,6 +127,11 @@ class FileHolder final {
/*! Reads @c size bytes and returns them as a vector. */
std::vector<uint8_t> read(std::size_t size);
/*! Reads @c a.size() bytes into @c a.data(). */
template <size_t size> std::size_t read(std::array<uint8_t, size> &a) {
return read(a.data(), a.size());
}
/*! Reads @c size bytes and writes them to @c buffer. */
std::size_t read(uint8_t *buffer, std::size_t size);