private static ushort GetPhysicalOffset(FloppyHeader floppyHeader, ushort sector)
{
var rootDirectory = floppyHeader.DirectoryEntries * 32;
var initialOffset = (ushort)(floppyHeader.BytesPerSector + 2 * floppyHeader.BytesPerSector * floppyHeader.SectorsPerFat) + rootDirectory;
return((ushort)(initialOffset + (sector - 2) * 512));
}
private static void DisplayFloppyHeader(FloppyHeader floppyHeader)
{
Console.WriteLine("Boot trap: " + Encoding.ASCII.GetString(floppyHeader.BootTrap));
Console.WriteLine("OEM: " + Encoding.ASCII.GetString(floppyHeader.Oem));
Console.WriteLine("Bytes per sector: " + floppyHeader.BytesPerSector);
Console.WriteLine("Sectors per cluster: " + floppyHeader.SectorsPerCluster);
Console.WriteLine("Reserved sectors: " + floppyHeader.ReservedSectors);
Console.WriteLine("FAT count: " + floppyHeader.FatCount);
Console.WriteLine("Directory entries: " + floppyHeader.DirectoryEntries);
Console.WriteLine("Total sectors: " + floppyHeader.TotalSectors);
Console.WriteLine("Media descriptor type: " + floppyHeader.MediaDescriptorType);
Console.WriteLine("Sectors per FAT: " + floppyHeader.SectorsPerFat);
Console.WriteLine("Sectors per track: " + floppyHeader.SectorsPerTrack);
Console.WriteLine("Sides count: " + floppyHeader.SidesCount);
Console.WriteLine("Hidden sectors: " + floppyHeader.HidddenSectors);
Console.WriteLine("Large amount: " + floppyHeader.LargeAmount);
Console.WriteLine();
Console.WriteLine("Drive number: " + floppyHeader.DriveNumber);
Console.WriteLine("Flags in Windows NT: " + floppyHeader.FlagsInWindowsNt);
Console.WriteLine("Signature: " + floppyHeader.Signature);
Console.WriteLine("Volume ID: " + floppyHeader.VolumeId);
Console.WriteLine("Volume label: " + Encoding.ASCII.GetString(floppyHeader.VolumeLabel));
Console.WriteLine("System identifier: " + Encoding.ASCII.GetString(floppyHeader.SystemIdentifier));
Console.WriteLine("Boot code: " + Encoding.ASCII.GetString(floppyHeader.BootCode));
Console.WriteLine("Bootloader signature: " + floppyHeader.BootSignature);
}
public static List <Directory> Parse(FloppyHeader floppyHeader, byte[] floppyData)
{
var directories = new List <Directory>();
var sectorsToParse = floppyHeader.DirectoryEntries * 32 / floppyHeader.BytesPerSector;
var initialOffset = (ushort)(floppyHeader.BytesPerSector + 2 * floppyHeader.BytesPerSector * floppyHeader.SectorsPerFat);
var offset = initialOffset;
for (var sector = 0; sector < sectorsToParse; sector++)
{
var data = floppyData.Skip(offset).Take(512).ToArray();
var fat = new Fat();
var size = Marshal.SizeOf(fat);
var ptr = Marshal.AllocHGlobal(size);
Marshal.Copy(data, 0, ptr, size);
fat = (Fat)Marshal.PtrToStructure(ptr, fat.GetType());
Marshal.FreeHGlobal(ptr);
directories.AddRange(fat.Directories);
offset += floppyHeader.BytesPerSector;
}
return(directories);
}
public static FloppyHeader Parse(byte[] floppyData)
{
var header = new FloppyHeader();
var size = Marshal.SizeOf(header);
var ptr = Marshal.AllocHGlobal(size);
Marshal.Copy(floppyData, 0, ptr, size);
header = (FloppyHeader)Marshal.PtrToStructure(ptr, header.GetType());
Marshal.FreeHGlobal(ptr);
return(header);
}
public static string GetContent(FloppyHeader floppyHeader, byte[] floppyData, List <ushort> chain)
{
var content = "";
foreach (var sector in chain)
{
var physicalOffset = GetPhysicalOffset(floppyHeader, sector);
var data = floppyData.Skip(physicalOffset).Take(512).ToArray();
content += Encoding.ASCII.GetString(data);
}
return(content);
}
public static ushort[] Parse(FloppyHeader floppyHeader, byte[] floppyData, uint index)
{
var initialOffset = GetOffsetForFatIndex(floppyHeader, index);
var fatSize = GetSizeOfFat(floppyHeader);
var currentOffset = initialOffset;
var maxOffset = currentOffset + fatSize;
var clusters = new List <ushort>();
while (currentOffset < maxOffset)
{
var firstByte = floppyData[currentOffset];
var secondByte = floppyData[currentOffset + 1];
var thirdByte = floppyData[currentOffset + 2];
clusters.Add(GetClusterValueWithFullLeft(firstByte, secondByte));
clusters.Add(GetClusterValueWithFullRight(secondByte, thirdByte));
currentOffset += 3;
}
return(clusters.ToArray());
}
private static ushort GetSizeOfFat(FloppyHeader floppyHeader)
{
return((ushort)(floppyHeader.BytesPerSector * floppyHeader.SectorsPerFat));
}
private static ushort GetOffsetForFatIndex(FloppyHeader floppyHeader, uint index)
{
return((ushort)(floppyHeader.BytesPerSector + index * floppyHeader.BytesPerSector * floppyHeader.SectorsPerFat));
}
