public static PX0CommentHeader GetCommentHeader(byte[] dta, ref int pos)
{
var dlen = (ushort)(dta[pos + 3] << 8 | dta[pos + 2]);
var cBytes = new byte[dlen];
for (var i = 0; i < dlen; i++)
{
byte b = dta[pos + 10 + i];
if (b == 0)
{
b = (byte)'\n';
}
cBytes[i] = b;
}
var hdr = new PX0CommentHeader(
(ushort)(dta[pos + 1] << 8 | dta[pos]), dlen,
dta[pos + 4], dta[pos + 5], dta[pos + 6], dta[pos + 7], dta[pos + 8], dta[pos + 9],
Encoding.ASCII.GetString(cBytes, 0, dlen)
);
var crc = GetCRC(dta, pos + 2, 8 + dlen, 0);
if (crc != hdr.CRC)
{
throw new Exception("Comment Header CRC is invalid!");
}
pos += (dlen + 9); // On last byte of comment header
return(hdr);
}
// Example input (from DOS prompt)
// ExtractPX0.exe "D:\Applications\APPRO6.2.27.167\OrigPickFiles\35.datafiles1.px0"
static void Main(string[] args)
{
string inPath = (null == args || 1 != args.Length || null == args[0]) ? null : args[0].Trim();
if (string.IsNullOrEmpty(inPath))
{
// We were expecting only a single parameter..
ShowUsage();
return;
}
var fi = new FileInfo(inPath);
if (!fi.Exists)
{
// Parameter does not represent a file
Console.WriteLine("File not found! '{0}'", inPath);
return;
}
if (0 != string.Compare(fi.Extension, ".px0", true))
{
// Input files are expected to have a '.px0' extension!
Console.WriteLine("Not a '.px0' file! '{0}'", inPath);
return;
}
string outPath = Path.ChangeExtension(fi.FullName, ".img");
if (File.Exists(outPath))
{
// Do not overwrite existing '.img' files!
Console.WriteLine("Output file already exists! '{0}'", outPath);
return;
}
var sectorDataList = new List <SectorData>();
try
{
// Get PXO file bytes. If compressed data existed, these bytes will
// represent the decompressed form!
var px0Bytes = GetPX0ImageBytes(inPath);
// Init a pointer we will use to traverse the PX0 file byte array
var px0Ptr = 0;
// Check that bytes represent valid data, read file header structure.
var px0Hdr = PX0Header.GetHeader(px0Bytes, ref px0Ptr);
px0Ptr++; // On first byte *after* header
PX0CommentHeader px0CmtHdr = null;
if ((px0Hdr.Stepping & 0x80) != 0)
{
// Extract 'comment header'
px0CmtHdr = PX0CommentHeader.GetCommentHeader(px0Bytes, ref px0Ptr);
px0Ptr++; // On first byte *after* 'comment header'
}
// Loop over track headers
PX0TrackHeader trkHdr;
while ((trkHdr = PX0TrackHeader.GetTrackHeader(px0Bytes, ref px0Ptr)) != null)
{
if (trkHdr.NumberOfSectors == 255)
{
break; // EOF marker!
}
px0Ptr++; // On first byte *after* 'track header'
for (int sNo = 0; sNo < trkHdr.NumberOfSectors; sNo++)
{
var sectHeader = PX0SectorHeader.GetSectorHeader(px0Bytes, ref px0Ptr);
/*
* Calculate 'Logical Sector' number (from: http://stackoverflow.com/questions/5774164/lba-and-cluster or
* http://en.wikipedia.org/wiki/Cylinder-head-sector)
* There are many sector numbering schemes on disk drives. One of the earliest was CHS (Cylinder-Head-Sector).
* One sector can be selected by specifying the cylinder (track), read/write head and sector per track triplet.
* This numbering scheme depends on the actual physical characteristics of the disk drive.
* The first logical sector resides on cylinder 0, head 0, sector 1. The second is on sector 2, and so on.
* If there isn't any more sectors on the disk (eg. on a 1.44M floppy disk there's 18 sectors per track),
* then the next head is applied, starting on sector 1 again, and so on.
*
* You can convert CHS addresses to an absolute (or logical) sector number with a little math:
*
* LSN = (C * Nh + H) * Ns + S - 1
*
* where C, H and S are the cylinder, head and sector numbers according to CHS adressing, while Nh and Ns are
* the number of heads and number of sectors per track (cylinder), respectively.
*
* To convert a logical sector number into a cylinder, head and sector number:
* S = (LSN mod Ns) + 1
* H = (LSN / Ns) mod Nh
* C = LSN / (Ns * Nh)
*/
var LSN = (trkHdr.CylNumber * px0Hdr.Sides + trkHdr.SideHeadNumber)
* trkHdr.NumberOfSectors + sectHeader.SectorNumber - 1;
//System.Diagnostics.Debug.WriteLine(string.Format("LSN = {0} where: C: {1}, Nh: {2}, H: {3}, Ns: {4}, S: {5}",
// LSN, trkHdr.CylNumber, px0Hdr.Sides, trkHdr.SideHeadNumber, trkHdr.NumberOfCylinders, sectHeader.SectorNumber));
sectorDataList.Add(new SectorData(LSN, sectHeader.sDta));
px0Ptr++; // On first byte *after* 'sector header'
}
}
if (sectorDataList.Count < 1)
{
throw new Exception("No sector data extracted!");
}
// Sort sector data by 'logical sector number'
sectorDataList.Sort();
}
catch (Exception ex)
{
Console.WriteLine("*ERROR* - Failed to convert file '{0}' - error: '{1}'", inPath, ex.Message);
return;
}
// Write out the image file!
try
{
using (var binWriter =
new BinaryWriter(File.Open(outPath, FileMode.Create)))
{
// Write out the disk image!!
foreach (var td in sectorDataList)
{
binWriter.Write(td.dta);
}
binWriter.Flush();
}
Console.WriteLine("Finished writing image file: " + outPath);
}
catch (Exception ex)
{
Console.WriteLine("*ERROR* - Failed to write image file '{0}' - error: '{1}'", outPath, ex.Message);
}
}
