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2bda78fb402756861fd3e151ae3be2aa03adef5f
fluxengine/lib/imagereader/imdimagereader.cc
David Given 2bda78fb40 Distinguish between filesystem track ordering and image track ordering 
(although currently only the filesystem ordering is used).
2024-11-29 22:07:58 +01:00

479 lines
18 KiB
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#include "lib/core/globals.h"
#include "lib/config/flags.h"
#include "lib/data/sector.h"
#include "lib/imagereader/imagereader.h"
#include "lib/data/image.h"
#include "lib/config/proto.h"
#include "lib/core/logger.h"
#include "lib/data/layout.h"
#include "lib/config/config.pb.h"
#include <algorithm>
#include <iostream>
#include <fstream>
static unsigned getModulationandSpeed(uint8_t flags, bool* fm)
{
switch (flags)
{
case 0: /* 500 kbps FM */
// clockRateKhz.setDefaultValue(250);
*fm = true;
return 500;
break;
case 1: /* 300 kbps FM */
*fm = true;
return 300;
break;
case 2: /* 250 kbps FM */
*fm = true;
return 250;
break;
case 3: /* 500 kbps MFM */
*fm = false;
return 500;
break;
case 4: /* 300 kbps MFM */
*fm = false;
return 300;
break;
case 5: /* 250 kbps MFM */
*fm = false;
return 250;
break;
default:
error(
"IMD: don't understand IMD disks with this modulation and "
"speed {}",
flags);
throw 0;
}
}
struct TrackHeader
{
uint8_t ModeValue;
uint8_t track;
uint8_t Head;
uint8_t numSectors;
uint8_t SectorSize;
};
static unsigned getSectorSize(uint8_t flags)
{
switch (flags)
{
case 0:
return 128;
break;
case 1:
return 256;
break;
case 2:
return 512;
break;
case 3:
return 1024;
break;
case 4:
return 2048;
break;
case 5:
return 4096;
break;
case 6:
return 8192;
break;
default:
error("not reachable");
throw 0;
}
}
#define SEC_CYL_MAP_FLAG 0x80
#define SEC_HEAD_MAP_FLAG 0x40
#define HEAD_MASK 0x3F
#define END_OF_FILE 0x1A
class IMDImageReader : public ImageReader
{
public:
IMDImageReader(const ImageReaderProto& config): ImageReader(config) {}
// clang-format off
/*
* IMAGE FILE FORMAT
* The overall layout of an ImageDisk .IMD image file is:
* IMD v.vv: dd/mm/yyyy hh:mm:ss
* Comment (ASCII only - unlimited size)
* 1A byte - ASCII EOF character
* - For each track on the disk:
* 1 byte Mode value (0-5) see getModulationspeed for definition
* 1 byte Cylinder (0-n)
* 1 byte Head (0-1)
* 1 byte number of sectors in track (1-n)
* 1 byte sector size (0-6) see getsectorsize for definition
* sector numbering map IMD start numbering sectors with 1.
* sector cylinder map (optional) definied in high byte of head (since head is 0 or 1)
* sector head map (optional) definied in high byte of head (since head is 0 or 1)
* sector data records For each data record:
* 1 byte Sector status
* 0: Sector data unavailable - could not be read
* 1: Normal data: (Sector Size) bytes follow
* 2: Compressed: All bytes in sector have same value (xx)
* 3: Normal data with "Deleted-Data address mark"
* 4: Compressed with "Deleted-Data address mark"
* 5: Normal data read with data error
* 6: Compressed read with data error"
* 7: Deleted data read with data error"
* 8: Compressed, Deleted read with data error"
* sector size of Sector data
* <End of file>
*/
// clang-format on
std::unique_ptr<Image> readImage() override
{
// Read File
std::ifstream inputFile(
_config.filename(), std::ios::in | std::ios::binary);
if (!inputFile.is_open())
error("IMD: cannot open input file");
// define some variables
bool fm = false; // define coding just to show in comment for setting
// the right write parameters
inputFile.seekg(0, inputFile.end);
int inputFileSize = inputFile.tellg(); // determine filesize
inputFile.seekg(0, inputFile.beg);
Bytes data;
data.writer() += inputFile;
ByteReader br(data);
std::unique_ptr<Image> image(new Image);
TrackHeader header = {0, 0, 0, 0, 0};
TrackHeader previousheader = {0, 0, 0, 0, 0};
auto layout = _extraConfig.mutable_layout();
unsigned n = 0;
unsigned headerPtr = 0;
unsigned Modulation_Speed = 0;
unsigned sectorSize = 0;
std::string sector_skew;
int b;
std::string comment;
bool blnOptionalCylinderMap = false;
bool blnOptionalHeadMap = false;
int trackSectorSize = -1;
// Read comment
comment.clear();
while ((b = br.read_8()) != EOF && b != END_OF_FILE)
{
comment.push_back(b);
n++;
}
headerPtr = n; // set pointer to after comment
log("Comment in IMD file: {}", comment);
for (;;)
{
if (headerPtr >= inputFileSize - 1)
{
break;
}
// first read header
header.ModeValue = br.read_8();
headerPtr++;
Modulation_Speed = getModulationandSpeed(header.ModeValue, &fm);
header.track = br.read_8();
headerPtr++;
header.Head = br.read_8();
headerPtr++;
header.numSectors = br.read_8();
headerPtr++;
header.SectorSize = br.read_8();
headerPtr++;
sectorSize = getSectorSize(header.SectorSize);
unsigned optionalsector_map[header.numSectors];
// The Sector Cylinder Map has one entry for each sector, and
// contains the logical Cylinder ID for the corresponding sector in
// the Sector Numbering Map.
if (header.Head & SEC_CYL_MAP_FLAG)
{
// Read optional cylinder map
for (b = 0; b < header.numSectors; b++)
{
optionalsector_map[b] = br.read_8();
headerPtr++;
}
blnOptionalCylinderMap = true; // set bool so we know there is
// an optional cylinder map
header.Head =
header.Head ^
SEC_CYL_MAP_FLAG; // remove flag 10000001 ^ 10000000 =
// 00000001 and 10000000 ^ 10000000 =
// 00000000
}
// Read optional sector head map
// The Sector Head Map has one entry for each sector, and contains
// the logical Head ID for the corresponding sector in the Sector
// Numbering Map.
unsigned optionalhead_map[header.numSectors];
if (header.Head & SEC_HEAD_MAP_FLAG)
{
// Read optional sector head map
for (b = 0; b < header.numSectors; b++)
{
optionalhead_map[b] = br.read_8();
headerPtr++;
}
blnOptionalHeadMap =
true; // set bool so we know there is an optional head map
header.Head =
header.Head ^
SEC_HEAD_MAP_FLAG; // remove flag 01000001 ^ 01000001 =
// 00000001 and 01000000 ^ 0100000 =
// 00000000 for writing sector head later
}
// read sector numbering map
sector_skew.clear();
bool blnBase0 = false; // check what first start number of the
// sector is. Fluxengine expects 1.
for (b = 0; b < header.numSectors; b++)
{
uint8_t t;
t = br.read_8();
if (t == 0x00)
blnBase0 = true;
if (blnBase0)
{
t = t + 1;
}
sector_skew.push_back(t);
headerPtr++;
}
auto ibm = _extraConfig.mutable_encoder()->mutable_ibm();
auto trackdata = ibm->add_trackdata();
auto layoutdata = layout->add_layoutdata();
trackdata->set_target_clock_period_us(1e3 / Modulation_Speed);
trackdata->set_target_rotational_period_ms(200);
if (trackSectorSize < 0)
{
trackSectorSize = sectorSize;
// this is the first sector we've read, use it settings for
// per-track data
trackdata->set_track(header.track);
trackdata->set_head(header.Head);
trackdata->set_use_fm(fm);
layoutdata->set_track(header.track);
layoutdata->set_side(header.Head);
layoutdata->set_sector_size(sectorSize);
}
else if (trackSectorSize != sectorSize)
{
error(
"IMD: multiple sector sizes per track are "
"currently unsupported");
}
// read the sectors
for (int s = 0; s < header.numSectors; s++)
{
Bytes sectordata;
Bytes compressed(sectorSize);
int SectorID;
SectorID = sector_skew[s];
const auto& sector =
image->put(header.track, header.Head, SectorID);
// read the status of the sector
unsigned int Status_Sector = br.read_8();
headerPtr++;
switch (Status_Sector)
{
// clang-format off
/* fluxengine knows of a few sector statussen but not all of the statussen in IMD.
* // the statussen are in sector.h. Translation to fluxengine is as follows:
* Statussen fluxengine | Status IMD
*--------------------------------------------------------------------------------------------------------------------
* OK, | 1, 2 (Normal data: (Sector Size) of (compressed) bytes follow)
* BAD_CHECKSUM, | 5, 6, 7, 8
* MISSING, sector not found | 0 (Sector data unavailable - could not be read)
* DATA_MISSING, sector present but no data found | 3, 4
* CONFLICT, |
* INTERNAL_ERROR |
*/
// clang-format on
case 0: /* Sector data unavailable - could not be read */
sector->status = Sector::MISSING;
break;
case 1: /* Normal data: (Sector Size) bytes follow */
sectordata = br.read(sectorSize);
headerPtr += sectorSize;
sector->data.writer().append(sectordata);
sector->status = Sector::OK;
break;
case 2: /* Compressed: All bytes in sector have same value
(xx) */
compressed[0] = br.read_8();
headerPtr++;
for (int k = 1; k < sectorSize; k++)
{
// fill data till sector is full
br.seek(headerPtr);
compressed[k] = br.read_8();
}
sector->data.writer().append(compressed);
sector->status = Sector::OK;
break;
case 3: /* Normal data with "Deleted-Data address mark" */
sector->status = Sector::DATA_MISSING;
sectordata = br.read(sectorSize);
headerPtr += sectorSize;
sector->data.writer().append(sectordata);
break;
case 4: /* Compressed with "Deleted-Data address mark"*/
compressed[0] = br.read_8();
headerPtr++;
for (int k = 1; k < sectorSize; k++)
{
// fill data till sector is full
br.seek(headerPtr);
compressed[k] = br.read_8();
}
sector->data.writer().append(compressed);
sector->status = Sector::DATA_MISSING;
break;
case 5: /* Normal data read with data error*/
sectordata = br.read(sectorSize);
headerPtr += sectorSize;
sector->status = Sector::BAD_CHECKSUM;
sector->data.writer().append(sectordata);
break;
case 6: /* Compressed read with data error*/
compressed[0] = br.read_8();
headerPtr++;
for (int k = 1; k < sectorSize; k++)
{
// fill data till sector is full
br.seek(headerPtr);
compressed[k] = br.read_8();
}
sector->data.writer().append(compressed);
sector->status = Sector::BAD_CHECKSUM;
break;
case 7: /* Deleted data read with data error*/
sectordata = br.read(sectorSize);
headerPtr += sectorSize;
sector->status = Sector::BAD_CHECKSUM;
sector->data.writer().append(sectordata);
break;
case 8: /* Compressed, Deleted read with data error*/
compressed[0] = br.read_8();
headerPtr++;
for (int k = 1; k < sectorSize; k++)
{
// fill data till sector is full
br.seek(headerPtr);
compressed[k] = br.read_8();
}
sector->data.writer().append(compressed);
sector->status = Sector::BAD_CHECKSUM;
break;
default:
error(
"IMD: Don't understand IMD files with sector "
"status {}, track {}, sector {}",
Status_Sector,
header.track,
s);
}
if (blnOptionalCylinderMap) // there was een optional cylinder
// map. write it to the sector
// The Sector Cylinder Map has one entry for each sector, and
// contains the logical Cylinder ID for the corresponding sector
// in the Sector Numbering Map.
{
sector->physicalTrack =
Layout::remapTrackLogicalToPhysical(header.track);
sector->logicalTrack = optionalsector_map[s];
blnOptionalCylinderMap = false;
}
else
{
sector->logicalTrack = header.track;
sector->physicalTrack =
Layout::remapTrackLogicalToPhysical(header.track);
}
if (blnOptionalHeadMap) // there was een optional head map.
// write it to the sector
// The Sector Head Map has one entry for each sector, and
// contains the logical Head ID for the corresponding sector in
// the Sector Numbering Map.
{
sector->physicalSide = header.Head;
sector->logicalSide = optionalhead_map[s];
blnOptionalHeadMap = false;
}
else
{
sector->logicalSide = header.Head;
sector->physicalSide = header.Head;
}
}
}
if (_extraConfig.encoder().format_case() !=
EncoderProto::FormatCase::FORMAT_NOT_SET)
log("IMD: overriding configured format");
image->calculateSize();
const Geometry& geometry = image->getGeometry();
size_t headSize = ((header.numSectors) * (sectorSize));
size_t trackSize = (headSize * (header.Head + 1));
log("IMD: read {} tracks, {} heads; {}; {} kbps; {} sectors; "
"sectorsize {}; {} kB total.",
header.track + 1,
header.Head + 1,
fm ? "FM" : "MFM",
Modulation_Speed,
header.numSectors,
sectorSize,
(header.track + 1) * trackSize / 1024);
layout->set_tracks(geometry.numTracks);
layout->set_sides(geometry.numSides);
return image;
}
};
std::unique_ptr<ImageReader> ImageReader::createIMDImageReader(
const ImageReaderProto& config)
{
return std::unique_ptr<ImageReader>(new IMDImageReader(config));
}
// vim: ts=4 sw=4 et
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