Properly initialise flags.

Fixes: #109
Merge pull request #108 from davidgiven/scp
2025-10-24 11:11:02 -07:00 · 2019-09-22 21:55:37 +02:00 · 2019-09-21 22:32:52 +02:00 · 2019-09-21 22:15:44 +02:00 · 2019-08-31 12:32:52 +02:00 · 2019-08-31 12:31:33 +02:00
30 changed files with 788 additions and 113 deletions
--- a/FluxEngine.cydsn/CortexM3/ARM_GCC_541/Release/FluxEngine.hex
+++ b/FluxEngine.cydsn/CortexM3/ARM_GCC_541/Release/FluxEngine.hex
@@ -17,24 +17,24 @@
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+:4003C0007801C077C2FDC46ECC66CEEAD007D204D60CD80CDE01E208EA01E201E680EA0205010F022D023301350239203F14560859045B045D905F01800288018C018F0427
+:400400009D01A502A804A904AD08AE01B004B10CB301B403B502BE01BF14D608D80BD904DB04DC99DD90DF0101A00240100812021880192020C821082202272429202A4043
+:400440002B102D4032403680378038403D803F0859145A405F806240632867016A806C086F02780183018B028D108E409140980199809D209E409F20A140A280A444C00BA7
+:40048000C403CA1ECC08CE58D61ED81EDE01E680EA02A904AB04AD08B440E802EE01170433043402371039043A203E808620C420CCE0CE70E21030203720831084028A08BE
+:4004C0009C029E809F10AD04CC30E220E640EE40560889809A089E809F20A420D4409E809F20A580A820EA8014407E018710C404DE045104564058405D8062086740858012
+:40050000871088408A018E4096029710B040D407D604D803E005E402EA01820286088740924095089770A608AE400B210F149240950897B1A202AB01AF40C20F25808280E6
+:400540008B029E80A580AF20C820E280EA4073807F029B80A302AB80DC80DE20EA8005200B800C020D040F08520254205E4061028C028F04924095089780A202AF04C001D7
+:40058000C20DD403D604D802E202E602A920AD02B420EC0801010D010F0111011D0100BD012A10050820324039804620082010C42000080280000000FE1001ED00E3001C2E
+:4005C00000000000000000000000040182EF3D10000000083800C11F07E0000000080220000010004603020000E0000412FFFFFF0020F00120100000000008000404040460
+:4006000099990001000800004020800840200008000040A8000000000000000000000000000000003F00003F1F001F0000000000000000001000000040000000000000003B
+:40064000C0000000FF0020FF4700470000010000A00000BFBF009F00000000000001000000000000000000000000000000000000000000000000000000000000000000004F
 :40068000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003A
 :4006C00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000FA
 :4007000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000B9
@@ -4615,12 +4615,12 @@
 :0200000490105A
 :04000000BC90ACAF55
 :0200000490303A
-:0200000033F2D9
+:020000004C1A98
 :0200000490402A
 :4000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000C0
 :400040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000080
 :400080000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040
 :4000C0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
 :0200000490501A
-:0C00000000012E16106900002E2A445B3F
+:0C00000000012E16106900002E2A5C83FF
 :00000001FF
--- a/FluxEngine.cydsn/FluxEngine.cyprj
+++ b/FluxEngine.cydsn/FluxEngine.cyprj
@@ -530,31 +530,38 @@
 <CyGuid_ebc4f06d-207f-49c2-a540-72acf4adabc0 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFolderSerialize" version="3">
 <CyGuid_2f73275c-45bf-46ba-b3b1-00a2fe0c8dd8 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtBaseContainerSerialize" version="1">
 <CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="LED" persistent="">
-<Hidden v="False" />
+<Hidden v="True" />
 </CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
 <CyGuid_0820c2e7-528d-4137-9a08-97257b946089 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemListSerialize" version="2">
 <dependencies>
 <CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
 <CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="LED_aliases.h" persistent="Generated_Source\PSoC5\LED_aliases.h">
-<Hidden v="False" />
+<Hidden v="True" />
 </CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
 <build_action v="HEADER;;;;" />
 <PropertyDeltas />
 </CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
 <CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
 <CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="LED.c" persistent="Generated_Source\PSoC5\LED.c">
-<Hidden v="False" />
+<Hidden v="True" />
 </CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
 <build_action v="SOURCE_C;CortexM3;;;" />
 <PropertyDeltas />
 </CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
 <CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
 <CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="LED.h" persistent="Generated_Source\PSoC5\LED.h">
-<Hidden v="False" />
+<Hidden v="True" />
 </CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
 <build_action v="HEADER;;;;" />
 <PropertyDeltas />
 </CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
+<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="LED_PM.c" persistent="Generated_Source\PSoC5\LED_PM.c">
+<Hidden v="True" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<build_action v="SOURCE_C;CortexM3;;;" />
+<PropertyDeltas />
+</CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
 </dependencies>
 </CyGuid_0820c2e7-528d-4137-9a08-97257b946089>
 </CyGuid_2f73275c-45bf-46ba-b3b1-00a2fe0c8dd8>
@@ -3282,6 +3289,39 @@
 </CyGuid_2f73275c-45bf-46ba-b3b1-00a2fe0c8dd8>
 <filters />
 </CyGuid_ebc4f06d-207f-49c2-a540-72acf4adabc0>
+<CyGuid_ebc4f06d-207f-49c2-a540-72acf4adabc0 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFolderSerialize" version="3">
+<CyGuid_2f73275c-45bf-46ba-b3b1-00a2fe0c8dd8 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtBaseContainerSerialize" version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="LED_PIN" persistent="">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<CyGuid_0820c2e7-528d-4137-9a08-97257b946089 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemListSerialize" version="2">
+<dependencies>
+<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="LED_PIN_aliases.h" persistent="Generated_Source\PSoC5\LED_PIN_aliases.h">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<build_action v="HEADER;;;;" />
+<PropertyDeltas />
+</CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
+<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="LED_PIN.c" persistent="Generated_Source\PSoC5\LED_PIN.c">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<build_action v="SOURCE_C;CortexM3;;;" />
+<PropertyDeltas />
+</CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
+<CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtFileSerialize" version="3" xml_contents_version="1">
+<CyGuid_31768f72-0253-412b-af77-e7dba74d1330 type_name="CyDesigner.Common.ProjMgmt.Model.CyPrjMgmtItemSerialize" version="2" name="LED_PIN.h" persistent="Generated_Source\PSoC5\LED_PIN.h">
+<Hidden v="False" />
+</CyGuid_31768f72-0253-412b-af77-e7dba74d1330>
+<build_action v="HEADER;;;;" />
+<PropertyDeltas />
+</CyGuid_8b8ab257-35d3-4473-b57b-36315200b38b>
+</dependencies>
+</CyGuid_0820c2e7-528d-4137-9a08-97257b946089>
+</CyGuid_2f73275c-45bf-46ba-b3b1-00a2fe0c8dd8>
+<filters />
+</CyGuid_ebc4f06d-207f-49c2-a540-72acf4adabc0>
 </dependencies>
 </CyGuid_0820c2e7-528d-4137-9a08-97257b946089>
 </CyGuid_2f73275c-45bf-46ba-b3b1-00a2fe0c8dd8>
--- a/FluxEngine.cydsn/TopDesign/TopDesign.cysch
+++ b/FluxEngine.cydsn/TopDesign/TopDesign.cysch
--- a/FluxEngine.cydsn/UdbSampler/UdbSampler.cyudb
+++ b/FluxEngine.cydsn/UdbSampler/UdbSampler.cyudb
--- a/4
+++ b/4
@@ -1,8 +1,8 @@
 PACKAGES = zlib sqlite3 libusb-1.0

-export CFLAGS = -O3 -g --std=c++14 \
+export CFLAGS = -Os -g --std=c++14 \
 	-ffunction-sections -fdata-sections
-export LDFLAGS = -O3
+export LDFLAGS = -Os

 ifeq ($(OS), Windows_NT)
 export CXX = /mingw32/bin/g++
--- a/arch/ibm/decoder.cc
+++ b/arch/ibm/decoder.cc
@@ -134,6 +134,9 @@ void IbmDecoder::decodeSectorRecord()
    uint16_t gotCrc = crc16(CCITT_POLY, bytes.slice(0, _currentHeaderLength + 5));
    if (wantCrc == gotCrc)
        _sector->status = Sector::DATA_MISSING; /* correct but unintuitive */
+
+    if (_ignoreSideByte)
+        _sector->logicalSide = _sector->physicalSide;
 }

 void IbmDecoder::decodeDataRecord()
--- a/arch/ibm/ibm.h
+++ b/arch/ibm/ibm.h
@@ -31,8 +31,9 @@ struct IbmIdam
 class IbmDecoder : public AbstractDecoder
 {
 public:
-    IbmDecoder(unsigned sectorBase):
-        _sectorBase(sectorBase)
+    IbmDecoder(unsigned sectorBase, bool ignoreSideByte=false):
+        _sectorBase(sectorBase),
+        _ignoreSideByte(ignoreSideByte)
    {}

    RecordType advanceToNextRecord();
@@ -41,6 +42,7 @@ public:

 private:
    unsigned _sectorBase;
+    bool _ignoreSideByte;
    unsigned _currentSectorSize;
    unsigned _currentHeaderLength;
 };
--- a/doc/using.md
+++ b/doc/using.md
@@ -221,10 +221,39 @@ directory.
  file format in a non-backwards-compatible way; this tool will upgrade flux
  files to the new format.

+  - `fluxengine convert`: converts flux files from various formats to various
+  other formats. You can use this to convert Catweasel flux files to
+  FluxEngine's native format, FluxEngine flux files to various other formats
+  useful for debugging (including VCD which can be loaded into
+  [sigrok](http://sigrok.org)), and bidirectional conversion to and from
+  Supercard Pro `.scp` format.
+
+  **Important SCP note:** import (`fluxengine convert scptoflux`) should be
+  fairly robust, but export (`fluxengine convert fluxtoscp`) should only be
+  done with great caution as FluxEngine files contain features which can't be
+  represented very well in `.scp` format and they're probably pretty dubious.
+  As ever, please [get in
+  touch](https://github.com/davidgiven/fluxengine/issues/new) with any reports.
+
 Commands which normally take `--source` or `--dest` get a sensible default if
 left unspecified. `fluxengine read ibm` on its own will read drive 0 and
 write an `ibm.img` file.

+## Visualisation
+
+When doing a read (either from a real disk or from a flux file) you can use
+`--write-svg=output.svg` to write out a graphical visualisation of where the
+sectors are on the disk. Here's a IBM PC 1232kB disk:
+
+![A disk visualisation](./visualiser.svg)
+
+Blue represents data, light blue a header, and red is a bad sector. Side zero
+is on the left and side one is on the right.
+
+The visualiser is extremely primitive and you have to explicitly tell it how
+big your disk is, in milliseconds. The default is 200ms (for a normal 3.5"
+disk). For a 5.25" disk, use `--visualiser-period=166`.
+
 ## Extra programs

 Supplied with FluxEngine, but not part of FluxEngine, are some little tools I
@@ -232,25 +261,24 @@ wrote to do useful things. These are built alongside FluxEngine.

  - `brother120tool`: extracts files from a 120kB Brother filesystem image.

-  - `cwftoflux`: converts (one flavour of) CatWeasel flux file into a
-    FluxEngine flux file.
-
 ## The recommended workflow

-So you've just received, say, a huge pile of old Brother word processor disks containing valuable historical data, and you want to read them.
+So you've just received, say, a huge pile of old Brother word processor disks
+containing valuable historical data, and you want to read them.

 Typically I do this:

 ```
-$ fluxengine read brother -s :d=0 -o brother.img --write-flux=brother.flux
+$ fluxengine read brother -s :d=0 -o brother.img --write-flux=brother.flux --write-svg=brother.svg
 ```

 This will read the disk in drive 0 and write out a filesystem image. It'll
-also copy the flux to brother.flux. If I then need to tweak the settings, I
-can rerun the decode without having to physically touch the disk like this:
+also copy the flux to brother.flux and write out an SVG visualisation. If I
+then need to tweak the settings, I can rerun the decode without having to
+physically touch the disk like this:

 ```
-$ fluxengine read brother -s brother.flux -o brother.img
+$ fluxengine read brother -s brother.flux -o brother.img --write-svg=brother.svg
 ```

 Apart from being drastically faster, this avoids touching the (potentially
--- a/doc/visualiser.svg
+++ b/doc/visualiser.svg
--- a/lib/decoders/decoders.cc
+++ b/lib/decoders/decoders.cc
@@ -43,19 +43,25 @@ void AbstractDecoder::decodeToSectors(Track& track)

        recordStart = fmr.tell();
        decodeSectorRecord();
-        pushRecord(recordStart, fmr.tell());
+        Fluxmap::Position recordEnd = fmr.tell();
+        pushRecord(recordStart, recordEnd);
        if (sector.status == Sector::DATA_MISSING)
        {
            /* The data is in a separate record. */

+            sector.headerStartTime = recordStart.ns();
+            sector.headerEndTime = recordEnd.ns();
            r = advanceToNextRecord();
            if (r == DATA_RECORD)
            {
                recordStart = fmr.tell();
                decodeDataRecord();
-                pushRecord(recordStart, fmr.tell());
+                recordEnd = fmr.tell();
+                pushRecord(recordStart, recordEnd);
            }
        }
+        sector.dataStartTime = recordStart.ns();
+        sector.dataEndTime = recordEnd.ns();

        if (sector.status != Sector::MISSING)
            track.sectors.push_back(sector);
--- a/lib/flags.cc
+++ b/lib/flags.cc
@@ -29,7 +29,7 @@ void FlagGroup::addFlag(Flag* flag)
    _flags.push_back(flag);
 }

-void FlagGroup::parseFlags(int argc, const char* argv[])
+std::vector<std::string> FlagGroup::parseFlagsWithFilenames(int argc, const char* argv[])
 {
    if (_initialised)
        throw std::runtime_error("called parseFlags() twice");
@@ -66,6 +66,7 @@ void FlagGroup::parseFlags(int argc, const char* argv[])

    /* Now actually parse them. */

+    std::vector<std::string> filenames;
    int index = 1;
    while (index < argc)
    {
@@ -76,52 +77,73 @@ void FlagGroup::parseFlags(int argc, const char* argv[])
        std::string value;
        bool usesthat = false;

-        if ((thisarg.size() == 0) || (thisarg[0] != '-'))
-            Error() << "non-option parameter " << thisarg << " seen (try --help)";
-        if ((thisarg.size() > 1) && (thisarg[1] == '-'))
+        if (thisarg.size() == 0)
        {
-            /* Long option. */
-
-            auto equals = thisarg.rfind('=');
-            if (equals != std::string::npos)
-            {
-                key = thisarg.substr(0, equals);
-                value = thisarg.substr(equals+1);
-            }
-            else
-            {
-                key = thisarg;
-                value = thatarg;
-                usesthat = true;
-            }
+            /* Ignore this argument. */
+        }
+        else if (thisarg[0] != '-')
+        {
+            /* This is a filename. */
+            filenames.push_back(thisarg);
        }
        else
        {
-            /* Short option. */
+            /* This is a flag. */

-            if (thisarg.size() > 2)
+            if ((thisarg.size() > 1) && (thisarg[1] == '-'))
            {
-                key = thisarg.substr(0, 2);
-                value = thisarg.substr(2);
+                /* Long option. */
+
+                auto equals = thisarg.rfind('=');
+                if (equals != std::string::npos)
+                {
+                    key = thisarg.substr(0, equals);
+                    value = thisarg.substr(equals+1);
+                }
+                else
+                {
+                    key = thisarg;
+                    value = thatarg;
+                    usesthat = true;
+                }
            }
            else
            {
-                key = thisarg;
-                value = thatarg;
-                usesthat = true;
+                /* Short option. */
+
+                if (thisarg.size() > 2)
+                {
+                    key = thisarg.substr(0, 2);
+                    value = thisarg.substr(2);
+                }
+                else
+                {
+                    key = thisarg;
+                    value = thatarg;
+                    usesthat = true;
+                }
            }
+
+            auto flag = flags_by_name.find(key);
+            if (flag == flags_by_name.end())
+                Error() << "unknown flag '" << key << "'; try --help";
+
+            flag->second->set(value);
+            if (usesthat && flag->second->hasArgument())
+                index++;
        }

-        auto flag = flags_by_name.find(key);
-        if (flag == flags_by_name.end())
-            Error() << "unknown flag '" << key << "'; try --help";
-
-        flag->second->set(value);
-
        index++;
-        if (usesthat && flag->second->hasArgument())
-            index++;
    }
+
+    return filenames;
+}
+
+void FlagGroup::parseFlags(int argc, const char* argv[])
+{
+    auto filenames = parseFlagsWithFilenames(argc, argv);
+    if (!filenames.empty())
+        Error() << "non-option parameter " << *filenames.begin() << " seen (try --help)";
 }

 void FlagGroup::checkInitialised() const
--- a/lib/flags.h
+++ b/lib/flags.h
@@ -14,6 +14,7 @@ public:

 public:
    void parseFlags(int argc, const char* argv[]);
+    std::vector<std::string> parseFlagsWithFilenames(int argc, const char* argv[]);
    void addFlag(Flag* flag);
    void checkInitialised() const;

--- a/lib/fluxsource/streamfluxsource.cc
+++ b/lib/fluxsource/streamfluxsource.cc
@@ -24,7 +24,7 @@ public:
    void recalibrate() {}

 private:
-    const std::string& _path;
+    const std::string _path;
 };

 std::unique_ptr<FluxSource> FluxSource::createStreamFluxSource(const std::string& path)
--- a/lib/globals.h
+++ b/lib/globals.h
@@ -22,7 +22,7 @@ extern void hexdumpForSrp16(std::ostream& stream, const Bytes& bytes);
 class Error
 {
 public:
-    ~Error()
+    [[ noreturn ]] ~Error()
    {
        std::cerr << "Error: " << _stream.str() << std::endl;
        exit(1);
--- a/lib/imagereader/imagereader.cc
+++ b/lib/imagereader/imagereader.cc
@@ -7,6 +7,13 @@
 #include "imagereader/imagereader.h"
 #include "fmt/format.h"

+std::map<std::string, ImageReader::Constructor> ImageReader::formats =
+{
+	{".adf", ImageReader::createImgImageReader},
+	{".d81", ImageReader::createImgImageReader},
+	{".img", ImageReader::createImgImageReader},
+};
+
 static bool ends_with(const std::string& value, const std::string& ending)
 {
    if (ending.size() > value.size())
@@ -14,15 +21,29 @@ static bool ends_with(const std::string& value, const std::string& ending)
    return std::equal(ending.rbegin(), ending.rend(), value.rbegin());
 }

-std::unique_ptr<ImageReader> ImageReader::create(const ImageSpec& spec)
+ImageReader::Constructor ImageReader::findConstructor(const ImageSpec& spec)
 {
    const auto& filename = spec.filename;

-    if (ends_with(filename, ".img") || ends_with(filename, ".adf"))
-        return createImgImageReader(spec);
+	for (const auto& e : formats)
+	{
+		if (ends_with(filename, e.first))
+			return e.second;
+	}

-    Error() << "unrecognised image filename extension";
-    return std::unique_ptr<ImageReader>();
+	return NULL;
+}
+
+std::unique_ptr<ImageReader> ImageReader::create(const ImageSpec& spec)
+{
+    verifyImageSpec(spec);
+    return findConstructor(spec)(spec);
+}
+
+void ImageReader::verifyImageSpec(const ImageSpec& spec)
+{
+    if (!findConstructor(spec))
+        Error() << "unrecognised image filename extension";
 }

 ImageReader::ImageReader(const ImageSpec& spec):
--- a/lib/imagereader/imagereader.h
+++ b/lib/imagereader/imagereader.h
@@ -12,10 +12,21 @@ public:

 public:
    static std::unique_ptr<ImageReader> create(const ImageSpec& spec);
+	static void verifyImageSpec(const ImageSpec& spec);

 private:
+	typedef 
+		std::function<
+			std::unique_ptr<ImageReader>(const ImageSpec& spec)
+		>
+		Constructor;
+
+	static std::map<std::string, Constructor> formats;
+
    static std::unique_ptr<ImageReader> createImgImageReader(const ImageSpec& spec);

+	static Constructor findConstructor(const ImageSpec& spec);
+
 public:
 	virtual SectorSet readImage() = 0;

--- a/lib/imagewriter/imagewriter.cc
+++ b/lib/imagewriter/imagewriter.cc
@@ -7,6 +7,15 @@
 #include "imagewriter/imagewriter.h"
 #include "fmt/format.h"

+std::map<std::string, ImageWriter::Constructor> ImageWriter::formats =
+{
+	{".adf", ImageWriter::createImgImageWriter},
+	{".d64", ImageWriter::createD64ImageWriter},
+	{".d81", ImageWriter::createImgImageWriter},
+	{".img", ImageWriter::createImgImageWriter},
+	{".ldbs", ImageWriter::createLDBSImageWriter},
+};
+
 static bool ends_with(const std::string& value, const std::string& ending)
 {
    if (ending.size() > value.size())
@@ -14,19 +23,29 @@ static bool ends_with(const std::string& value, const std::string& ending)
    return std::equal(ending.rbegin(), ending.rend(), value.rbegin());
 }

-std::unique_ptr<ImageWriter> ImageWriter::create(const SectorSet& sectors, const ImageSpec& spec)
+ImageWriter::Constructor ImageWriter::findConstructor(const ImageSpec& spec)
 {
    const auto& filename = spec.filename;

-    if (ends_with(filename, ".img") || ends_with(filename, ".adf"))
-        return createImgImageWriter(sectors, spec);
-	else if (ends_with(filename, ".ldbs"))
-		return createLDBSImageWriter(sectors, spec);
-	else if (ends_with(filename, ".d64"))
-		return createD64ImageWriter(sectors, spec);
+	for (const auto& e : formats)
+	{
+		if (ends_with(filename, e.first))
+			return e.second;
+	}

-    Error() << "unrecognised image filename extension";
-    return std::unique_ptr<ImageWriter>();
+	return NULL;
+}
+
+std::unique_ptr<ImageWriter> ImageWriter::create(const SectorSet& sectors, const ImageSpec& spec)
+{
+	verifyImageSpec(spec);
+	return findConstructor(spec)(sectors, spec);
+}
+
+void ImageWriter::verifyImageSpec(const ImageSpec& spec)
+{
+	if (!findConstructor(spec))
+		Error() << "unrecognised image filename extension";
 }

 ImageWriter::ImageWriter(const SectorSet& sectors, const ImageSpec& spec):
--- a/lib/imagewriter/imagewriter.h
+++ b/lib/imagewriter/imagewriter.h
@@ -12,8 +12,17 @@ public:

 public:
    static std::unique_ptr<ImageWriter> create(const SectorSet& sectors, const ImageSpec& spec);
+	static void verifyImageSpec(const ImageSpec& filename);

 private:
+	typedef 
+		std::function<
+			std::unique_ptr<ImageWriter>(const SectorSet& sectors, const ImageSpec& spec)
+		>
+		Constructor;
+
+	static std::map<std::string, Constructor> formats;
+
    static std::unique_ptr<ImageWriter> createImgImageWriter(
 		const SectorSet& sectors, const ImageSpec& spec);
    static std::unique_ptr<ImageWriter> createLDBSImageWriter(
@@ -21,6 +30,8 @@ private:
    static std::unique_ptr<ImageWriter> createD64ImageWriter(
 		const SectorSet& sectors, const ImageSpec& spec);

+	static Constructor findConstructor(const ImageSpec& spec);
+
 public:
 	virtual void adjustGeometry();
 	void printMap();
--- a/lib/reader.cc
+++ b/lib/reader.cc
@@ -9,14 +9,16 @@
 #include "decoders/decoders.h"
 #include "sector.h"
 #include "sectorset.h"
+#include "visualiser.h"
 #include "record.h"
 #include "image.h"
 #include "bytes.h"
 #include "decoders/rawbits.h"
 #include "track.h"
+#include "imagewriter/imagewriter.h"
 #include "fmt/format.h"

-FlagGroup readerFlags { &hardwareFluxSourceFlags, &fluxmapReaderFlags };
+FlagGroup readerFlags { &hardwareFluxSourceFlags, &fluxmapReaderFlags, &visualiserFlags };

 static DataSpecFlag source(
    { "--source", "-s" },
@@ -33,6 +35,11 @@ static StringFlag destination(
    "write the raw magnetic flux to this file",
    "");

+static StringFlag visualise(
+	{ "--write-svg" },
+	"write a visualisation of the disk to this file",
+	"");
+
 static SettableFlag justRead(
 	{ "--just-read" },
 	"just read the disk and do no further processing");
@@ -142,7 +149,7 @@ static void replace_sector(std::unique_ptr<Sector>& replacing, Sector& replaceme
 			return;
 		}
 	}
-	if (!replacing || (replacing->status != Sector::OK))
+	if (!replacing || ((replacing->status != Sector::OK) && (replacement.status == Sector::OK)))
 	{
 		if (!replacing)
 			replacing.reset(new Sector);
@@ -153,7 +160,8 @@ static void replace_sector(std::unique_ptr<Sector>& replacing, Sector& replaceme
 void readDiskCommand(AbstractDecoder& decoder)
 {
 	const ImageSpec outputSpec(output);
-
+	ImageWriter::verifyImageSpec(outputSpec);
+        
 	bool failures = false;
 	SectorSet allSectors;
 	auto tracks = readTracks();
@@ -251,6 +259,9 @@ void readDiskCommand(AbstractDecoder& decoder)
        std::cout << size << " bytes decoded." << std::endl;
    }

+	if (!visualise.get().empty())
+		visualiseSectorsToFile(allSectors, visualise.get());
+
    writeSectorsToFile(allSectors, outputSpec);
 	if (failures)
 		std::cerr << "Warning: some sectors could not be decoded." << std::endl;
--- a/lib/sector.h
+++ b/lib/sector.h
@@ -27,6 +27,10 @@ public:
 	Status status = Status::INTERNAL_ERROR;
    Fluxmap::Position position;
    nanoseconds_t clock = 0;
+    nanoseconds_t headerStartTime = 0;
+    nanoseconds_t headerEndTime = 0;
+    nanoseconds_t dataStartTime = 0;
+    nanoseconds_t dataEndTime = 0;
    int physicalTrack = 0;
    int physicalSide = 0;
    int logicalTrack = 0;
--- a/lib/sectorset.h
+++ b/lib/sectorset.h
@@ -17,6 +17,9 @@ public:
 	std::unique_ptr<Sector>& get(int track, int head, int sector);
 	Sector* get(int track, int head, int sector) const;

+	const std::map<const key_t, std::unique_ptr<Sector>>& get() const
+	{ return _data; }
+
 	void calculateSize(
 		unsigned& numTracks, unsigned& numHeads, unsigned& numSectors,
 		unsigned& sectorSize) const;
--- a/lib/visualiser.cc
+++ b/lib/visualiser.cc
@@ -0,0 +1,95 @@
+#define _USE_MATH_DEFINES
+#include "globals.h"
+#include "image.h"
+#include "sector.h"
+#include "sectorset.h"
+#include "visualiser.h"
+#include "fmt/format.h"
+#include "flags.h"
+#include <iostream>
+#include <fstream>
+#include <math.h>
+
+FlagGroup visualiserFlags;
+
+static IntFlag period(
+    { "--visualiser-period" },
+    "rotational period for use by the visualiser (milliseconds)",
+    200);
+
+static const int SIZE = 480;
+static const int BORDER = 10;
+static const int RADIUS = (SIZE/2) - (BORDER/2);
+static const int CORE = 50;
+static const int TRACKS = 83;
+static const double TRACK_SPACING = double(RADIUS-CORE) / TRACKS;
+
+void visualiseSectorsToFile(const SectorSet& sectors, const std::string& filename)
+{
+    std::cout << "writing visualisation\n";
+    std::ofstream f(filename, std::ios::out);
+    if (!f.is_open())
+        Error() << "cannot open visualisation file";
+
+    f << fmt::format("<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"{0} {1} {2} {3}\">",
+        0, 0, SIZE*2, SIZE);
+
+    const double radians_per_ns = 2.0*M_PI / (period*1e6);
+
+    auto drawSide = [&](int side)
+    {
+        f << fmt::format("<g transform='matrix(1 0 0 -1 {} {})'>", SIZE/2 + (side*SIZE), SIZE/2);
+        f << fmt::format("<circle cx='0' cy='0' r='{}' stroke='none' fill='#ccc'/>", RADIUS);
+
+        for (int physicalTrack = 0; physicalTrack < TRACKS; physicalTrack++)
+        {
+            double radius = CORE + physicalTrack*TRACK_SPACING;
+            f << fmt::format("<circle cx='0' cy='0' r='{}' stroke='#888' stroke-width='0.5' fill='none'/>", radius);
+
+            auto drawArc = [&](const std::unique_ptr<Sector>& sector, nanoseconds_t start, nanoseconds_t end, const std::string& colour)
+            {
+                start %= period*1000000;
+                end %= period*1000000;
+                if (end < start)
+                    end += period*1000000;
+                
+                double theta1 = start * radians_per_ns;
+                double theta2 = end * radians_per_ns;
+                int large = (theta2 - theta1) >= M_PI;
+
+                f << fmt::format("\n<!-- {} {} = {} {} -->", start, end, theta1, theta2);
+                f << fmt::format("<path fill='none' stroke='{}' stroke-width='1.5' d='", colour);
+                f << fmt::format("M {} {} ", cos(theta1)*radius, sin(theta1)*radius);
+                f << fmt::format("A {0} {0} 0 {3} 1 {1} {2}", radius, cos(theta2)*radius, sin(theta2)*radius, large);
+                f << fmt::format("'><title>Track {} Head {} Sector {}; {}ms to {}ms</title></path>",
+                    sector->logicalTrack, sector->logicalSide, sector->logicalSector,
+                    start/1e6, end/1e6);
+            };
+
+            /* Sadly, SectorSets aren't indexable by physical track. */
+            for (const auto& e : sectors.get())
+            {
+                const auto& sector = e.second;
+                if ((sector->physicalSide == side) && (sector->physicalTrack == physicalTrack))
+                {
+                    const char* colour = "#f00";
+                    if (sector->status == Sector::OK)
+                        colour = "#00f";
+                    if (sector->headerStartTime && sector->headerEndTime)
+                        drawArc(sector, sector->headerStartTime, sector->headerEndTime, "#0ff");
+                    if (sector->dataStartTime && sector->dataEndTime)
+                        drawArc(sector, sector->dataStartTime, sector->dataEndTime, colour);
+                }
+            }
+        }
+
+        f << "</g>";
+    };
+
+    f << fmt::format("<rect x='0' y='0' width='{}' height='{}' stroke='none' fill='#fff'/>", SIZE*2, SIZE);
+
+    drawSide(0);
+    drawSide(1);
+
+    f << "</svg>";
+}
--- a/lib/visualiser.h
+++ b/lib/visualiser.h
@@ -0,0 +1,12 @@
+#ifndef VISUALISER_H
+#define VISUALISER_H
+
+#include "flags.h"
+
+class SectorSet;
+
+extern FlagGroup visualiserFlags;
+
+extern void visualiseSectorsToFile(const SectorSet& sectors, const std::string& filename);
+
+#endif
--- a/mkninja.sh
+++ b/mkninja.sh
@@ -183,12 +183,14 @@ buildlibrary libbackend.a \
    lib/sectorset.cc \
    lib/sql.cc \
    lib/usb.cc \
+    lib/visualiser.cc \
    lib/writer.cc \

 buildlibrary libfrontend.a \
    src/fe-cwftoflux.cc \
    src/fe-erase.cc \
    src/fe-fluxtoau.cc \
+    src/fe-fluxtoscp.cc \
    src/fe-fluxtovcd.cc \
    src/fe-inspect.cc \
    src/fe-readadfs.cc \
@@ -207,6 +209,7 @@ buildlibrary libfrontend.a \
    src/fe-readvictor9k.cc \
    src/fe-readzilogmcz.cc \
    src/fe-rpm.cc \
+    src/fe-scptoflux.cc \
    src/fe-seek.cc \
    src/fe-testbulktransport.cc \
    src/fe-upgradefluxfile.cc \
--- a/src/fe-erase.cc
+++ b/src/fe-erase.cc
@@ -3,7 +3,7 @@
 #include "fluxmap.h"
 #include "writer.h"

-static FlagGroup flags;
+static FlagGroup flags { &writerFlags };

 int mainErase(int argc, const char* argv[])
 {
--- a/src/fe-fluxtoscp.cc
+++ b/src/fe-fluxtoscp.cc
@@ -0,0 +1,188 @@
+#include "globals.h"
+#include "flags.h"
+#include "fluxmap.h"
+#include "sql.h"
+#include "bytes.h"
+#include "protocol.h"
+#include "dataspec.h"
+#include "fmt/format.h"
+#include "decoders/fluxmapreader.h"
+#include "scp.h"
+#include <fstream>
+#include <algorithm>
+
+static FlagGroup flags { };
+
+static SettableFlag fortyTrackMode(
+    { "--48", "-4" },
+    "set 48 tpi mode; only every other physical track is emitted"
+);
+
+static SettableFlag singleSided(
+    { "--single-sided", "-s" },
+    "only emit side 0"
+);
+
+static IntFlag diskType(
+    { "--disk-type" },
+    "sets the SCP disk type byte",
+    0xff
+);
+
+static sqlite3* inputDb;
+
+static void syntax()
+{
+    std::cout << "Syntax: fluxengine convert fluxtoscp <fluxfile> <scpfile>\n";
+    exit(0);
+}
+
+static void write_le32(uint8_t dest[4], uint32_t v)
+{
+    dest[0] = v;
+    dest[1] = v >> 8;
+    dest[2] = v >> 16;
+    dest[3] = v >> 24;
+}
+
+static int strackno(int track, int side)
+{
+    if (fortyTrackMode)
+        track /= 2;
+    if (singleSided)
+        return track;
+    else
+        return (track << 1) | side;
+}
+
+int mainConvertFluxToScp(int argc, const char* argv[])
+{
+    auto filenames = flags.parseFlagsWithFilenames(argc, argv);
+    if (filenames.size() != 2)
+        syntax();
+
+    inputDb = sqlOpen(filenames[0], SQLITE_OPEN_READONLY);
+    auto tracks = sqlFindFlux(inputDb);
+
+    int maxTrack = 0;
+    int maxSide = 0;
+    for (auto p : tracks)
+    {
+        if (singleSided && (p.second == 1))
+            continue;
+        maxTrack = std::max(maxTrack, (int)p.first);
+        maxSide = std::max(maxSide, (int)p.second);
+    }
+    int maxStrack = strackno(maxTrack, maxSide);
+
+    std::cout << fmt::format("Writing {} {} SCP file containing {} SCP tracks\n",
+        fortyTrackMode ? "48 tpi" : "96 tpi",
+        singleSided ? "single sided" : "double sided",
+        maxStrack + 1
+    );
+
+    ScpHeader fileheader = {0};
+    fileheader.file_id[0] = 'S';
+    fileheader.file_id[1] = 'C';
+    fileheader.file_id[2] = 'P';
+    fileheader.file_id[3] = 0x18; /* Version 1.8 of the spec */
+    fileheader.type = diskType;
+    fileheader.revolutions = 5;
+    fileheader.start_track = 0;
+    fileheader.end_track = maxStrack;
+    fileheader.flags = SCP_FLAG_INDEXED | (fortyTrackMode ? 0 : SCP_FLAG_96TPI);
+    fileheader.cell_width = 0;
+    fileheader.heads = singleSided ? 1 : 0;
+
+    Bytes trackdata;
+    ByteWriter trackdataWriter(trackdata);
+
+    int trackstep = 1 + fortyTrackMode;
+    int maxside = singleSided ? 0 : 1;
+    for (int track = 0; track <= maxTrack; track += trackstep)
+    {
+        for (int side = 0; side <= maxside; side++)
+        {
+            int strack = strackno(track, side);
+            std::cout << fmt::format("FE track {}.{}, SCP track {}: ", track, side, strack) << std::flush;
+
+            auto fluxmap = sqlReadFlux(inputDb, track, side);
+            ScpTrack trackheader = {0};
+            trackheader.track_id[0] = 'T';
+            trackheader.track_id[1] = 'R';
+            trackheader.track_id[2] = 'K';
+            trackheader.strack = strack;
+
+            FluxmapReader fmr(*fluxmap);
+            Bytes fluxdata;
+            ByteWriter fluxdataWriter(fluxdata);
+
+            int revolution = 0;
+            unsigned revTicks = 0;
+            unsigned totalTicks = 0;
+            unsigned ticksSinceLastPulse = 0;
+            uint32_t startOffset = 0;
+            while (revolution < 5)
+            {
+                unsigned ticks;
+                int opcode = fmr.readOpcode(ticks);
+                if (ticks)
+                {
+                    ticksSinceLastPulse += ticks;
+                    totalTicks += ticks;
+                    revTicks += ticks;
+                }
+
+                switch (opcode)
+                {
+                    case -1: /* end of flux, treat like an index marker */
+                    case F_OP_INDEX:
+                    {
+                        auto* revheader = &trackheader.revolution[revolution];
+                        write_le32(revheader->offset, startOffset + sizeof(ScpTrack));
+                        write_le32(revheader->length, (fluxdataWriter.pos - startOffset) / 2);
+                        write_le32(revheader->index, revTicks * NS_PER_TICK / 25);
+                        revolution++;
+                        revheader++;
+                        revTicks = 0;
+                        startOffset = fluxdataWriter.pos;
+                        break;
+                    }
+
+                    case F_OP_PULSE:
+                    {
+                        unsigned t = ticksSinceLastPulse * NS_PER_TICK / 25;
+                        while (t >= 0x10000)
+                        {
+                            fluxdataWriter.write_be16(0);
+                            t -= 0x10000;
+                        }
+                        fluxdataWriter.write_be16(t);
+                        ticksSinceLastPulse = 0;
+                        break;
+                    }
+                }
+            }
+
+            write_le32(fileheader.track[strack], trackdataWriter.pos + sizeof(ScpHeader));
+            trackdataWriter += Bytes((uint8_t*)&trackheader, sizeof(trackheader));
+            trackdataWriter += fluxdata;
+
+            std::cout << fmt::format("{} ms in {} bytes\n",
+                totalTicks * MS_PER_TICK,
+                fluxdata.size());
+        }
+    }
+
+    sqlClose(inputDb);
+    
+    std::cout << "Writing output file...\n";
+    std::ofstream of(filenames[1], std::ios::out | std::ios::binary);
+    if (!of.is_open())
+        Error() << "cannot open output file";
+    of.write((const char*) &fileheader, sizeof(fileheader));
+    of.write((const char*) trackdata.begin(), trackdata.size());
+    of.close();
+
+    return 0;
+}
--- a/src/fe-readibm.cc
+++ b/src/fe-readibm.cc
@@ -17,13 +17,18 @@ static IntFlag sectorIdBase(
 	"Sector ID of the first sector.",
 	1);

+static BoolFlag ignoreSideByte(
+	{ "--ignore-side-byte" },
+	"Ignore the side byte in the sector ID, and use the physical side instead.",
+	false);
+
 int mainReadIBM(int argc, const char* argv[])
 {
 	setReaderDefaultSource(":t=0-79:s=0-1");
 	setReaderDefaultOutput("ibm.img");
    flags.parseFlags(argc, argv);

-	IbmDecoder decoder(sectorIdBase);
+	IbmDecoder decoder(sectorIdBase, ignoreSideByte);
 	readDiskCommand(decoder);
    return 0;
 }
--- a/src/fe-scptoflux.cc
+++ b/src/fe-scptoflux.cc
@@ -0,0 +1,142 @@
+#include "globals.h"
+#include "fluxmap.h"
+#include "sql.h"
+#include "bytes.h"
+#include "protocol.h"
+#include "fmt/format.h"
+#include "scp.h"
+#include <fstream>
+
+static std::ifstream inputFile;
+static sqlite3* outputDb;
+static ScpHeader header;
+static nanoseconds_t resolution;
+static int startSide;
+static int endSide;
+
+static void syntax()
+{
+    std::cout << "Syntax: fluxengine convert cwftoflux <cwffile> <fluxfile>\n";
+    exit(0);
+}
+
+static void check_for_error()
+{
+    if (inputFile.fail())
+        Error() << fmt::format("I/O error: {}", strerror(errno));
+}
+
+static int trackno(int strack)
+{
+    if (startSide == endSide)
+        return strack;
+    return strack >> 1;
+}
+
+static int headno(int strack)
+{
+    if (startSide == endSide)
+        return startSide;
+    return strack & 1;
+}
+
+static void read_header()
+{
+    inputFile.read((char*) &header, sizeof(header));
+    check_for_error();
+
+    if ((header.file_id[0] != 'S')
+            || (header.file_id[1] != 'C')
+            || (header.file_id[2] != 'P'))
+        Error() << "input not a SCP file";
+
+    resolution = 25 * (header.resolution + 1);
+    startSide = (header.heads == 2) ? 1 : 0;
+    endSide = (header.heads == 1) ? 0 : 1;
+
+    if ((header.cell_width != 0) && (header.cell_width != 16))
+        Error() << "currently only 16-bit cells are supported";
+
+    std::cout << fmt::format("tracks {}-{}, heads {}-{}\n",
+        trackno(header.start_track), trackno(header.end_track), startSide, endSide);
+    std::cout << fmt::format("sample resolution: {} ns\n", resolution);
+}
+
+static void read_track(int strack)
+{
+    uint32_t offset = Bytes(header.track[strack], 4).reader().read_le32();
+
+    ScpTrack trackheader;
+    inputFile.seekg(offset, std::ios::beg);
+    inputFile.read((char*) &trackheader, sizeof(trackheader));
+    check_for_error();
+
+    if ((trackheader.track_id[0] != 'T')
+            || (trackheader.track_id[1] != 'R')
+            || (trackheader.track_id[2] != 'K'))
+        Error() << "corrupt SCP file";
+
+    std::cout << fmt::format("{}.{}: ", trackno(strack), headno(strack))
+        << std::flush;
+
+    Fluxmap fluxmap;
+    nanoseconds_t pending = 0;
+    unsigned inputBytes = 0;
+    for (int revolution = 0; revolution < header.revolutions; revolution++)
+    {
+        if (revolution != 0)
+            fluxmap.appendIndex();
+
+        uint32_t datalength = Bytes(trackheader.revolution[revolution].length, 4).reader().read_le32();
+        uint32_t dataoffset = Bytes(trackheader.revolution[revolution].offset, 4).reader().read_le32();
+
+        Bytes data(datalength*2);
+        inputFile.seekg(dataoffset + offset, std::ios::beg);
+        inputFile.read((char*) data.begin(), data.size());
+        check_for_error();
+
+        ByteReader br(data);
+        for (int cell = 0; cell < datalength; cell++)
+        {
+            uint16_t interval = br.read_be16();
+            if (interval)
+            {
+                fluxmap.appendInterval((interval + pending) * resolution / NS_PER_TICK);
+                fluxmap.appendPulse();
+                pending = 0;
+            }
+            else
+                pending += 0x10000;
+        }
+
+        inputBytes += datalength*2;
+    }
+
+    std::cout << fmt::format(" {} ms in {} input bytes and {} output bytes\n",
+        fluxmap.duration() / 1e6, inputBytes, fluxmap.bytes());
+    sqlWriteFlux(outputDb, trackno(strack), headno(strack), fluxmap);
+}
+
+int mainConvertScpToFlux(int argc, const char* argv[])
+{
+    if (argc != 3)
+        syntax();
+    
+    inputFile.open(argv[1], std::ios::in | std::ios::binary);
+    if (!inputFile.is_open())
+		Error() << fmt::format("cannot open input file '{}'", argv[1]);
+
+    outputDb = sqlOpen(argv[2], SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE);
+    sqlPrepareFlux(outputDb);
+    sqlWriteIntProperty(outputDb, "version", FLUX_VERSION_CURRENT);
+    sqlStmt(outputDb, "BEGIN;");
+
+    read_header();
+    inputFile.seekg(sizeof(header), std::ios::beg);
+    for (unsigned i=header.start_track; i<=header.end_track; i++)
+        read_track(i);
+
+    sqlStmt(outputDb, "COMMIT;");
+    sqlClose(outputDb);
+    return 0;
+}
--- a/src/fluxengine.cc
+++ b/src/fluxengine.cc
@@ -5,7 +5,9 @@ typedef int command_cb(int agrc, const char* argv[]);
 extern command_cb mainErase;
 extern command_cb mainConvertCwfToFlux;
 extern command_cb mainConvertFluxToAu;
+extern command_cb mainConvertFluxToScp;
 extern command_cb mainConvertFluxToVcd;
+extern command_cb mainConvertScpToFlux;
 extern command_cb mainInspect;
 extern command_cb mainReadADFS;
 extern command_cb mainReadAESLanier;
@@ -83,7 +85,9 @@ static std::vector<Command> writeables =
 static std::vector<Command> convertables =
 {
    { "cwftoflux",     mainConvertCwfToFlux, "Converts CatWeasel stream files to flux.", },
+    { "scptoflux",     mainConvertScpToFlux, "Converts Supercard Pro stream files to flux.", },
    { "fluxtoau",      mainConvertFluxToAu,  "Converts (one track of a) flux file to an .au audio file.", },
+    { "fluxtoscp",     mainConvertFluxToScp, "Converrt a flux file to a Supercard Pro file.", },
    { "fluxtovcd",     mainConvertFluxToVcd, "Converts (one track of a) flux file to a VCD file.", },
 };

--- a/src/scp.h
+++ b/src/scp.h
@@ -0,0 +1,43 @@
+#ifndef SCP_H
+#define SCP_H
+
+struct ScpHeader
+{
+    char file_id[3];       // file ID - 'SCP'
+    uint8_t version;       // major/minor in nibbles
+    uint8_t type;          // disk type - subclass/class in nibbles
+    uint8_t revolutions;   // up to 5
+    uint8_t start_track;   // 0..165
+    uint8_t end_track;     // 0..165
+    uint8_t flags;         // see below
+    uint8_t cell_width;    // in bits, 0 meaning 16
+    uint8_t heads;         // 0 = both, 1 = side 0 only, 2 = side 1 only
+    uint8_t resolution;    // 25ns * (resolution+1)
+    uint8_t checksum[4];   // of data after this point
+    uint8_t track[165][4]; // track offsets, not necessarily 165
+};
+
+enum
+{
+    SCP_FLAG_INDEXED    = (1<<0),
+    SCP_FLAG_96TPI      = (1<<1),
+    SCP_FLAG_360RPM     = (1<<2),
+    SCP_FLAG_NORMALIZED = (1<<3),
+    SCP_FLAG_READWRITE  = (1<<4),
+    SCP_FLAG_FOOTER     = (1<<5)
+};
+
+struct ScpTrack
+{
+    char track_id[3];      // 'TRK'
+    uint8_t strack;        // SCP track number
+    struct
+    {
+        uint8_t index[4];  // time for one revolution
+        uint8_t length[4]; // number of bitcells
+        uint8_t offset[4]; // offset to bitcell data, relative to track header
+    }
+    revolution[5];
+};
+
+#endif
Author	SHA1	Message	Date
David Given	658e2b7295	Properly initialise flags. Fixes: #109	2019-09-22 21:55:37 +02:00
David Given	7b4a8d6de2	Merge pull request #108 from davidgiven/scp Add very beta support for scp import and export	2019-09-21 22:32:52 +02:00
David Given	e8f7b51aef	Another documentation tweak.	2019-09-21 22:15:44 +02:00
David Given	9d6bc57a5f	Update documentation.	2019-08-31 12:32:52 +02:00
David Given	73766f92b4	Fix the flux to scp converter.	2019-08-31 12:31:33 +02:00
David Given	80badf3b54	Remember to check in the build file changes...	2019-08-31 12:09:11 +02:00
David Given	116529f85a	Archival, non-working checkin of the flux to scp converter (it appears to produce garbage).	2019-08-31 01:41:11 +02:00
David Given	5a2b2bc07a	Allow support for command lines with non-argument filenames.	2019-08-31 01:40:44 +02:00
David Given	41070395c0	Merge pull request #105 from davidgiven/scp Add conversion support for Supercard Pro scp files.	2019-08-28 23:52:27 +02:00
David Given	4304d1eede	Add the Supercard Pro decoder.	2019-08-28 23:32:09 +02:00
David Given	46f1b0aef4	Merge pull request #104 from davidgiven/sampler Fix a nasty sampler bug leading to corrupted data	2019-08-28 00:23:21 +02:00
David Given	9923d67a7c	Merge pull request #103 from davidgiven/visualiser Add a simple disk visualiser.	2019-08-28 00:20:49 +02:00
David Given	99335a84fd	Add documentation for the visualiser.	2019-08-28 00:19:18 +02:00
David Given	c266779433	Fix a bug where index pulses where being turned into flux pulses on read, leading to completely broken data whenever an index pulse happened.	2019-08-27 23:58:07 +02:00
David Given	bdcc12cd53	Correctly import M_PI.	2019-08-27 23:08:13 +02:00
David Given	7988d0fe24	Don't replace bad sectors with more bad sectors. This means that if a sector is permanently bad, the one which wins and goes into the output SectorSet is the first one, not the last one. Frequently the last sector is truncated by the end of read and so it isn't useful.	2019-08-27 22:39:24 +02:00
David Given	27f5c294b1	The visualiser period can now be specified in a flag.	2019-08-27 01:21:49 +02:00
David Given	b9a53e0d1c	First draft of the visualiser.	2019-08-27 01:07:57 +02:00
David Given	f8b6d5e6fb	Merge.	2019-08-25 00:24:34 +02:00
David Given	04ff31c348	Add a flag to the IBM decoder to tell it to ignore the logical sector IDs (some formats don't use these).	2019-08-25 00:24:02 +02:00
David Given	77b4aebd1b	Fix crashing bug when reading Kryoflux streams.	2019-08-24 23:53:22 +02:00
David Given	4056364300	Merge pull request #99 from davidgiven/extensions Validate image extensions before reading, not after.	2019-08-22 22:09:42 +02:00
David Given	60bfe050d3	Refactor the way image extensions are handled to be generally cleaner. Add support for validating ImageSpecs before we actually want to read/write an image, so as to allow us to check the extension before wasting time reading a disk. Make .d81 an alias of .img.	2019-08-21 00:45:10 +02:00