mirror of
https://github.com/davidgiven/fluxengine.git
synced 2025-10-31 11:17:01 -07:00
239 lines
8.8 KiB
C++
239 lines
8.8 KiB
C++
#include "globals.h"
|
|
#include "flags.h"
|
|
#include "sector.h"
|
|
#include "imagereader/imagereader.h"
|
|
#include "image.h"
|
|
#include "proto.h"
|
|
#include "logger.h"
|
|
#include "mapper.h"
|
|
#include "lib/config.pb.h"
|
|
#include "fmt/format.h"
|
|
#include <algorithm>
|
|
#include <iostream>
|
|
#include <fstream>
|
|
|
|
// reader based on this partial documentation of the D88 format:
|
|
// https://www.pc98.org/project/doc/d88.html
|
|
|
|
class D88ImageReader : public ImageReader
|
|
{
|
|
public:
|
|
D88ImageReader(const ImageReaderProto& config): ImageReader(config) {}
|
|
|
|
std::unique_ptr<Image> readImage()
|
|
{
|
|
std::ifstream inputFile(
|
|
_config.filename(), std::ios::in | std::ios::binary);
|
|
if (!inputFile.is_open())
|
|
Error() << "cannot open input file";
|
|
|
|
Bytes header(0x24); // read first entry of track table as well
|
|
inputFile.read((char*)header.begin(), header.size());
|
|
|
|
// the DIM header technically has a bit field for sectors present,
|
|
// however it is currently ignored by this reader
|
|
|
|
std::string diskName = header.slice(0, 0x16);
|
|
|
|
if (diskName[0])
|
|
Logger() << fmt::format("D88: disk name: {}", diskName);
|
|
|
|
ByteReader headerReader(header);
|
|
|
|
char mediaFlag = headerReader.seek(0x1b).read_8();
|
|
|
|
inputFile.seekg(0, std::ios::end);
|
|
int fileSize = inputFile.tellg();
|
|
|
|
int diskSize = headerReader.seek(0x1c).read_le32();
|
|
|
|
if (diskSize > fileSize)
|
|
Logger() << "D88: found multiple disk images. Only using first";
|
|
|
|
int trackTableEnd = headerReader.seek(0x20).read_le32();
|
|
int trackTableSize = trackTableEnd - 0x20;
|
|
|
|
Bytes trackTable(trackTableSize);
|
|
inputFile.seekg(0x20);
|
|
inputFile.read((char*)trackTable.begin(), trackTable.size());
|
|
ByteReader trackTableReader(trackTable);
|
|
|
|
if (config.encoder().format_case() !=
|
|
EncoderProto::FormatCase::FORMAT_NOT_SET)
|
|
Logger() << "D88: overriding configured format";
|
|
|
|
auto ibm = config.mutable_encoder()->mutable_ibm();
|
|
int clockRate = 500;
|
|
if (mediaFlag == 0x20)
|
|
{
|
|
Logger() << "D88: high density mode";
|
|
if (!config.drive().has_drive())
|
|
config.mutable_drive()->set_high_density(true);
|
|
if (!config.has_tpi())
|
|
config.set_tpi(96);
|
|
}
|
|
else
|
|
{
|
|
Logger() << "D88: single/double density mode";
|
|
clockRate = 300;
|
|
if (!config.drive().has_drive())
|
|
config.mutable_drive()->set_high_density(false);
|
|
if (!config.has_tpi())
|
|
config.set_tpi(48);
|
|
}
|
|
|
|
std::unique_ptr<Image> image(new Image);
|
|
for (int track = 0; track < trackTableSize / 4; track++)
|
|
{
|
|
int trackOffset = trackTableReader.seek(track * 4).read_le32();
|
|
if (trackOffset == 0)
|
|
continue;
|
|
|
|
int currentTrackOffset = trackOffset;
|
|
int currentTrackTrack = -1;
|
|
int currentSectorsInTrack =
|
|
0xffff; // don't know # of sectors until we read the first one
|
|
int trackSectorSize = -1;
|
|
int trackMfm = -1;
|
|
|
|
auto trackdata = ibm->add_trackdata();
|
|
trackdata->set_target_clock_period_us(1e3 / clockRate);
|
|
trackdata->set_target_rotational_period_ms(167);
|
|
auto sectors = trackdata->mutable_sectors();
|
|
|
|
for (int sectorInTrack = 0; sectorInTrack < currentSectorsInTrack;
|
|
sectorInTrack++)
|
|
{
|
|
Bytes sectorHeader(0x10);
|
|
inputFile.read(
|
|
(char*)sectorHeader.begin(), sectorHeader.size());
|
|
ByteReader sectorHeaderReader(sectorHeader);
|
|
int track = sectorHeaderReader.seek(0).read_8();
|
|
int head = sectorHeaderReader.seek(1).read_8();
|
|
int sectorId = sectorHeaderReader.seek(2).read_8();
|
|
int sectorSize = 128 << sectorHeaderReader.seek(3).read_8();
|
|
int sectorsInTrack = sectorHeaderReader.seek(4).read_le16();
|
|
int fm = sectorHeaderReader.seek(6).read_8();
|
|
int ddam = sectorHeaderReader.seek(7).read_8();
|
|
int fddStatusCode = sectorHeaderReader.seek(8).read_8();
|
|
int rpm = sectorHeaderReader.seek(13).read_8();
|
|
// D88 provides much more sector information that is currently
|
|
// ignored
|
|
if (ddam != 0)
|
|
Error() << "D88: nonzero ddam currently unsupported";
|
|
if (rpm != 0)
|
|
Error()
|
|
<< "D88: 1.44MB 300rpm formats currently unsupported";
|
|
if (fddStatusCode != 0)
|
|
Error() << "D88: nonzero fdd status codes are currently "
|
|
"unsupported";
|
|
if (currentSectorsInTrack == 0xffff)
|
|
{
|
|
currentSectorsInTrack = sectorsInTrack;
|
|
}
|
|
else if (currentSectorsInTrack != sectorsInTrack)
|
|
{
|
|
Error() << "D88: mismatched number of sectors in track";
|
|
}
|
|
if (currentTrackTrack < 0)
|
|
{
|
|
currentTrackTrack = track;
|
|
}
|
|
else if (currentTrackTrack != track)
|
|
{
|
|
Error() << "D88: all sectors in a track must belong to the "
|
|
"same track";
|
|
}
|
|
if (trackSectorSize < 0)
|
|
{
|
|
trackSectorSize = sectorSize;
|
|
// this is the first sector we've read, use it settings for
|
|
// per-track data
|
|
trackdata->set_track(track);
|
|
trackdata->set_head(head);
|
|
trackdata->set_sector_size(sectorSize);
|
|
trackdata->set_use_fm(fm);
|
|
if (fm)
|
|
{
|
|
trackdata->set_gap_fill_byte(0xffff);
|
|
trackdata->set_idam_byte(0xf57e);
|
|
trackdata->set_dam_byte(0xf56f);
|
|
}
|
|
// create timings to approximately match N88-BASIC
|
|
if (clockRate == 300) {
|
|
if (sectorSize <= 256)
|
|
{
|
|
trackdata->set_gap0(0x1b);
|
|
trackdata->set_gap2(0x14);
|
|
trackdata->set_gap3(0x1b);
|
|
}
|
|
} else {
|
|
if (sectorSize <= 128)
|
|
{
|
|
trackdata->set_gap0(0x1b);
|
|
trackdata->set_gap2(0x09);
|
|
trackdata->set_gap3(0x1b);
|
|
}
|
|
else if (sectorSize <= 256)
|
|
{
|
|
trackdata->set_gap0(0x36);
|
|
trackdata->set_gap3(0x36);
|
|
}
|
|
}
|
|
}
|
|
else if (trackSectorSize != sectorSize)
|
|
{
|
|
Error() << "D88: multiple sector sizes per track are "
|
|
"currently unsupported";
|
|
}
|
|
Bytes data(sectorSize);
|
|
inputFile.read((char*)data.begin(), data.size());
|
|
const auto& sector = image->put(track, head, sectorId);
|
|
sector->status = Sector::OK;
|
|
sector->logicalTrack = track;
|
|
sector->physicalTrack = Mapper::remapTrackLogicalToPhysical(track);
|
|
sector->logicalSide = sector->physicalHead = head;
|
|
sector->logicalSector = sectorId;
|
|
sector->data = data;
|
|
|
|
sectors->add_sector(sectorId);
|
|
}
|
|
|
|
if (mediaFlag != 0x20)
|
|
{
|
|
auto trackdata = ibm->add_trackdata();
|
|
trackdata->set_target_clock_period_us(1e3 / clockRate);
|
|
trackdata->set_target_rotational_period_ms(167);
|
|
}
|
|
}
|
|
|
|
image->calculateSize();
|
|
const Geometry& geometry = image->getGeometry();
|
|
Logger() << fmt::format("D88: read {} tracks, {} sides",
|
|
geometry.numTracks,
|
|
geometry.numSides);
|
|
|
|
if (!config.has_heads())
|
|
{
|
|
auto* heads = config.mutable_heads();
|
|
heads->set_start(0);
|
|
heads->set_end(geometry.numSides - 1);
|
|
}
|
|
|
|
if (!config.has_tracks())
|
|
{
|
|
auto* tracks = config.mutable_tracks();
|
|
tracks->set_start(0);
|
|
tracks->set_end(geometry.numTracks - 1);
|
|
}
|
|
|
|
return image;
|
|
}
|
|
};
|
|
|
|
std::unique_ptr<ImageReader> ImageReader::createD88ImageReader(
|
|
const ImageReaderProto& config)
|
|
{
|
|
return std::unique_ptr<ImageReader>(new D88ImageReader(config));
|
|
}
|