public bool Format()
{
if (!diskDevice.CanWrite)
{
return(false);
}
BinaryFormat masterboot = new BinaryFormat(new byte[512]);
masterboot.SetUInt(MasterBootRecord.DiskSignature, diskSignature);
masterboot.SetUShort(MasterBootRecord.MBRSignature, MasterBootConstants.MBRSignature);
if (code != null)
{
for (uint index = 0; index < MasterBootConstants.CodeAreaSize; index++)
{
masterboot.SetByte(index, code[index]);
}
}
//TODO: write partitions
diskDevice.WriteBlock(0, 1, masterboot.Data);
return(true);
}
private bool ReadMasterBootBlock()
{
valid = false;
if (diskDevice.BlockSize != 512) // only going to work with 512 sector sizes
{
return(false);
}
BinaryFormat masterboot = new BinaryFormat(diskDevice.ReadBlock(0, 1));
ushort mbrsignature = masterboot.GetUShort(MasterBootRecord.MBRSignature);
diskSignature = masterboot.GetUInt(MasterBootRecord.DiskSignature);
valid = (mbrsignature == MasterBootConstants.MBRSignature);
if (valid)
{
for (uint index = 0; index < MaxMBRPartitions; index++)
{
uint offset = MasterBootRecord.PrimaryPartitions + (index * 16);
GenericPartition partition = new GenericPartition(index);
partition.Bootable = masterboot.GetByte(offset + PartitionRecord.Status) == 0x80;
partition.PartitionType = masterboot.GetByte(offset + PartitionRecord.PartitionType);
partition.StartLBA = masterboot.GetUInt(offset + PartitionRecord.LBA);
partition.TotalBlocks = masterboot.GetUInt(offset + PartitionRecord.Sectors);
partitions[index] = partition;
}
//TODO: Extended Partitions
}
code = new byte[MasterBootConstants.CodeAreaSize];
for (uint index = 0; index < MasterBootConstants.CodeAreaSize; index++)
{
code[index] = masterboot.GetByte(index);
}
return(valid);
}
// doesn't work since uint should be uint64
//protected bool ReadLBA48 (SectorOperation operation, uint drive, uint lba, MemoryBlock memory)
//{
// FeaturePort.Write8 (0);
// FeaturePort.Write8 (0);
// SectorCountPort.Write8 (0);
// SectorCountPort.Write8 (1);
// LBALowPort.Write8 ((byte)((lba >> 24) & 0xFF));
// LBALowPort.Write8 ((byte)(lba & 0xFF));
// LBAMidPort.Write8 ((byte)((lba >> 32) & 0xFF));
// LBAMidPort.Write8 ((byte)((lba >> 8) & 0xFF));
// LBAHighPort.Write8 ((byte)((lba >> 40) & 0xFF));
// LBAHighPort.Write8 ((byte)((lba >> 16) & 0xFF));
// DeviceHeadPort.Write8 ((byte)(0x40 | (drive << 4)));
// if (operation == SectorOperation.Write)
// CommandPort.Write8 (0x34);
// else
// CommandPort.Write8 (0x24);
// if (!WaitForReqisterReady ())
// return false;
// //TODO: Don't use PIO
// if (operation == SectorOperation.Read) {
// for (uint index = 0; index < 256; index++)
// memory.SetUShort (index * 2, DataPort.Read16 ());
// }
// else {
// for (uint index = 0; index < 256; index++)
// DataPort.WriteUShort (memory.GetUShort (index * 2));
// }
// return true;
//}
public bool Open (uint driveNbr)
{
if (driveNbr == 0)
DeviceHeadPort.Write8 (0xA0);
else
if (driveNbr == 1)
DeviceHeadPort.Write8 (0xB0);
else
return false;
CommandPort.Write8 (IDECommand.IdentifyDrive);
if (!WaitForReqisterReady ())
return false;
BinaryFormat info = new BinaryFormat (new byte[512]);
for (uint index = 0; index < 256; index++)
info.SetUShort (index * 2, DataPort.Read16 ());
driveInfo[driveNbr].MaxLBA = info.GetUInt (IdentifyDrive.MaxLBA28);
// legacy info
driveInfo[driveNbr].Heads = info.GetUShort (IdentifyDrive.LogicalHeads);
driveInfo[driveNbr].Cylinders = info.GetUShort (IdentifyDrive.LogicalCylinders);
driveInfo[driveNbr].SectorsPerTrack = info.GetUShort (IdentifyDrive.LogicalSectors);
return true;
}
protected bool PerformLBA28 (SectorOperation operation, uint driveNbr, uint lba, byte[] data, uint offset)
{
FeaturePort.Write8 (0);
SectorCountPort.Write8 (1);
LBALowPort.Write8 ((byte)(lba & 0xFF));
LBAMidPort.Write8 ((byte)((lba >> 8) & 0xFF));
LBAHighPort.Write8 ((byte)((lba >> 16) & 0xFF));
DeviceHeadPort.Write8 ((byte)(0xE0 | (driveNbr << 4) | ((lba >> 24) & 0x0F)));
if (operation == SectorOperation.Write)
CommandPort.Write8 (IDECommand.WriteSectorsWithRetry);
else
CommandPort.Write8 (IDECommand.ReadSectorsWithRetry);
if (!WaitForReqisterReady ())
return false;
BinaryFormat sector = new BinaryFormat (data);
//TODO: Don't use PIO
if (operation == SectorOperation.Read) {
for (uint index = 0; index < 256; index++)
sector.SetUShort (offset + (index * 2), DataPort.Read16 ());
}
else {
for (uint index = 0; index < 256; index++)
DataPort.Write16 (sector.GetUShort (offset + (index * 2)));
}
return true;
}
public bool Compare (byte[] data, uint offset, FATType type)
{
BinaryFormat entry = new BinaryFormat (data);
byte first = entry.GetByte (offset + Entry.DOSName);
if (first == FileNameAttribute.LastEntry)
return false;
if ((first == FileNameAttribute.Deleted) | (first == FileNameAttribute.Dot))
return false;
if (first == FileNameAttribute.Escape)
return false;
uint startcluster = FAT.GetClusterEntry (data, offset, type);
if (startcluster == cluster)
return true;
return false;
}
public void Delete (uint childBlock, uint parentBlock, uint parentBlockIndex)
{
BinaryFormat entry = new BinaryFormat (partition.ReadBlock (parentBlock, 1));
entry.SetByte ((parentBlockIndex * Entry.EntrySize) + Entry.DOSName, (byte)FileNameAttribute.Deleted);
partition.WriteBlock (parentBlock, 1, entry.Data);
if (!FreeClusterChain (childBlock))
throw new System.ArgumentException (); //throw new IOException ("Unable to free all cluster allocations in fat");
}
public uint GetFileSize (uint directoryBlock, uint index)
{
BinaryFormat directory = new BinaryFormat (partition.ReadBlock (directoryBlock, 1));
return directory.GetUInt ((index * Entry.EntrySize) + Entry.FileSize);
}
public DirectoryEntryLocation FindEntry (FAT.ICompare compare, uint startCluster)
{
uint activeSector = (startCluster == 0) ? firstRootDirectorySector : (startCluster * this.sectorsPerCluster);
uint increment = 0;
for (; ; ) {
BinaryFormat directory = new BinaryFormat (partition.ReadBlock (activeSector, 1));
for (uint index = 0; index < entriesPerSector; index++) {
if (directory.GetByte ((index * Entry.EntrySize) + Entry.DOSName) == FileNameAttribute.LastEntry)
return new DirectoryEntryLocation ();
FileAttributes attribute = (FileAttributes)directory.GetByte ((index * Entry.EntrySize) + Entry.FileAttributes);
if (compare.Compare (directory.Data, index * 32, fatType))
return new DirectoryEntryLocation (GetClusterEntry (directory.Data, index, fatType), activeSector, index, (attribute & FileAttributes.SubDirectory) != 0);
}
++increment;
if (startCluster == 0) {
// root directory
if (increment >= rootDirSectors)
return new DirectoryEntryLocation ();
activeSector = startCluster + increment;
continue;
}
else {
// subdirectory
if (increment < sectorsPerCluster) {
// still within cluster
activeSector = startCluster + increment;
continue;
}
// exiting cluster
// goto next cluster (if any)
uint cluster = GetClusterBySector (startCluster);
if (cluster == 0)
return new DirectoryEntryLocation ();
uint nextCluster = GetClusterEntryValue (cluster);
if ((IsClusterLast (nextCluster)) || (IsClusterBad (nextCluster)) || (IsClusterFree (nextCluster)) || (IsClusterReserved (nextCluster)))
return new DirectoryEntryLocation ();
activeSector = (uint)(dataAreaStart + (nextCluster - 1 * sectorsPerCluster));
continue;
}
}
}
public static string ExtractFileName (byte[] directory, uint index)
{
BinaryFormat entry = new BinaryFormat (directory);
char[] name = new char[12];
for (uint i = 0; i < 8; i++)
name[i] = (char)entry.GetByte (index + i + Entry.DOSName);
int len = 8;
for (int i = 7; i > 0; i--)
if (name[i] == ' ')
len--;
else
break;
// special case where real character is same as the delete
if ((len >= 1) && (name[0] == (char)FileNameAttribute.Escape))
name[0] = (char)FileNameAttribute.Deleted;
name[len] = '.';
len++;
for (uint i = 0; i < 3; i++)
name[len + i] = (char)entry.GetByte (index + i + Entry.DOSExtension);
len = len + 3;
int spaces = 0;
for (int i = len - 1; i >= 0; i--)
if (name[i] == ' ')
spaces++;
else
break;
if (spaces == 3)
spaces = 4;
len = len - spaces;
string result = SharpOS.Kernel.Foundation.Convert.ToString (name, 0, len);
//Runtime.Free (name);
return result;
}
protected bool SetClusterEntryValue (uint cluster, uint nextcluster)
{
uint fatOffset = 0;
if (fatType == FATType.FAT12)
fatOffset = (cluster + (cluster / 2));
else if (fatType == FATType.FAT16)
fatOffset = cluster * 2;
else //if (type == FatType.FAT32)
fatOffset = cluster * 4;
uint sector = fatStart + (fatOffset / bytesPerSector);
uint sectorOffset = fatOffset % bytesPerSector;
uint nbrSectors = 1;
if ((fatType == FATType.FAT12) && (sectorOffset == bytesPerSector - 1))
nbrSectors = 2;
BinaryFormat fat = new BinaryFormat (partition.ReadBlock (sector, nbrSectors));
if (fatType == FATType.FAT12) {
uint clustervalue = fat.GetUShort (sectorOffset);
if (cluster % 2 == 1)
clustervalue = ((clustervalue & 0xF) | (nextcluster << 4));
else
clustervalue = ((clustervalue & 0xf000) | (nextcluster));
fat.SetUShort (sectorOffset, (ushort)clustervalue);
}
else if (fatType == FATType.FAT16)
fat.SetUShort (sectorOffset, (ushort)nextcluster);
else //if (type == FatType.FAT32)
fat.SetUInt (sectorOffset, nextcluster);
partition.WriteBlock (sector, nbrSectors, fat.Data);
return true;
}
//protected uint ClusterToFirstSector (uint cluster)
//{
// return ((cluster - 2) * sectorspercluster) + firstdatasector;
//}
protected uint GetClusterEntryValue (uint cluster)
{
uint fatoffset = 0;
if (fatType == FATType.FAT12)
fatoffset = (cluster + (cluster / 2));
else if (fatType == FATType.FAT16)
fatoffset = cluster * 2;
else //if (type == FatType.FAT32)
fatoffset = cluster * 4;
uint sector = fatStart + (fatoffset / bytesPerSector);
uint sectorOffset = fatoffset % bytesPerSector;
uint nbrSectors = 1;
if ((fatType == FATType.FAT12) && (sectorOffset == bytesPerSector - 1))
nbrSectors = 2;
BinaryFormat fat = new BinaryFormat (partition.ReadBlock (sector, nbrSectors));
uint clusterValue;
if (fatType == FATType.FAT12) {
clusterValue = fat.GetUShort (sectorOffset);
if (cluster % 2 == 1)
clusterValue = clusterValue >> 4;
else
clusterValue = clusterValue & 0x0fff;
}
else if (fatType == FATType.FAT16)
clusterValue = fat.GetUShort (sectorOffset);
else //if (type == FatType.FAT32)
clusterValue = fat.GetUInt (sectorOffset) & 0x0fffffff;
return clusterValue;
}
public bool Format (FATSettings fatSettings)
{
if (!partition.CanWrite)
return false;
this.fatType = fatSettings.FatType;
bytesPerSector = 512;
totalSectors = partition.BlockCount;
sectorsPerCluster = GetSectorsPerClusterByTotalSectors (fatType, totalSectors);
nbrFats = 2;
if (fatType == FATType.FAT32) {
reservedSectors = 32;
rootEntries = 0;
}
else {
reservedSectors = 1;
rootEntries = 512;
}
rootDirSectors = (((rootEntries * 32) + (bytesPerSector - 1)) / bytesPerSector);
fatStart = reservedSectors;
uint val1 = totalSectors - (reservedSectors + rootDirSectors);
uint val2 = (uint)((256 * sectorsPerCluster) + nbrFats);
if (fatType == FATType.FAT32)
val2 = val2 / 2;
uint sectorsperfat = (val1 + (val2 - 1)) / val2;
BinaryFormat bootSector = new BinaryFormat (512);
bootSector.SetUInt (BootSector.JumpInstruction, 0);
bootSector.SetString (BootSector.EOMName, "MSWIN4.1");
bootSector.SetUShort (BootSector.BytesPerSector, (ushort)bytesPerSector);
bootSector.SetByte (BootSector.SectorsPerCluster, (byte)sectorsPerCluster);
bootSector.SetUShort (BootSector.ReservedSectors, (ushort)reservedSectors);
bootSector.SetByte (BootSector.FatAllocationTables, nbrFats);
bootSector.SetUShort (BootSector.MaxRootDirEntries, (ushort)rootEntries);
if (totalSectors > 0xFFFF) {
bootSector.SetUShort (BootSector.TotalSectors, 0);
bootSector.SetUInt (BootSector.FAT32_TotalSectors, totalClusters);
}
else {
bootSector.SetUShort (BootSector.TotalSectors, (ushort)totalSectors);
bootSector.SetUInt (BootSector.FAT32_TotalSectors, 0);
}
bootSector.SetByte (BootSector.MediaDescriptor, 0xF8);
if (fatType == FATType.FAT32)
bootSector.SetUShort (BootSector.SectorsPerFAT, 0);
else
bootSector.SetUShort (BootSector.SectorsPerFAT, (ushort)sectorsperfat);
bootSector.SetUShort (BootSector.SectorsPerTrack, 0); ////FIXME
bootSector.SetUInt (BootSector.HiddenSectors, 0);
if (fatType != FATType.FAT32) {
bootSector.SetByte (BootSector.PhysicalDriveNbr, 0x80);
bootSector.SetByte (BootSector.ReservedCurrentHead, 0);
bootSector.SetByte (BootSector.ExtendedBootSignature, 0x29);
bootSector.SetBytes (BootSector.IDSerialNumber, fatSettings.SerialID, 0, (uint)(fatSettings.SerialID.Length <= 4 ? fatSettings.SerialID.Length : 4));
bootSector.SetString (BootSector.VolumeLabel, " "); // 12 blank spaces
bootSector.SetString (BootSector.VolumeLabel, fatSettings.VolumeLabel, (uint)(fatSettings.VolumeLabel.Length <= 12 ? fatSettings.VolumeLabel.Length : 12));
bootSector.SetUShort (BootSector.BootSectorSignature, 0x55AA);
//BootSector.OSBootCode // TODO
}
if (fatType == FATType.FAT12)
bootSector.SetString (BootSector.FATType, "FAT12 ");
else if (fatType == FATType.FAT16)
bootSector.SetString (BootSector.FATType, "FAT16 ");
else // if (type == FatType.FAT32)
bootSector.SetString (BootSector.FATType, "FAT32 ");
if (fatType == FATType.FAT32) {
bootSector.SetUInt (BootSector.FAT32_SectorPerFAT, sectorsperfat);
bootSector.SetByte (BootSector.FAT32_Flags, 0);
bootSector.SetUShort (BootSector.FAT32_Version, 0);
bootSector.SetUInt (BootSector.FAT32_ClusterNumberOfRoot, 2);
bootSector.SetUShort (BootSector.FAT32_SectorFSInformation, 1);
bootSector.SetUShort (BootSector.FAT32_SecondBootSector, 6);
//FAT32_Reserved1
bootSector.SetByte (BootSector.FAT32_PhysicalDriveNbr, 0x80);
bootSector.SetByte (BootSector.FAT32_Reserved2, 0);
bootSector.SetByte (BootSector.FAT32_ExtendedBootSignature, 0x29);
bootSector.SetBytes (BootSector.FAT32_IDSerialNumber, fatSettings.SerialID, 0, (uint)(fatSettings.SerialID.Length <= 4 ? fatSettings.SerialID.Length : 4));
bootSector.SetString (BootSector.FAT32_VolumeLabel, " "); // 12 blank spaces
bootSector.SetString (BootSector.FAT32_VolumeLabel, fatSettings.VolumeLabel, (uint)(fatSettings.VolumeLabel.Length <= 12 ? fatSettings.VolumeLabel.Length : 12));
bootSector.SetString (BootSector.FAT32_FATType, "FAT32 ");
//BootSector.OSBootCode // TODO
}
// Write Boot Sector
partition.WriteBlock (0, 1, bootSector.Data);
// Write backup Boot Sector
if (fatType == FATType.FAT32) {
partition.WriteBlock (0, 1, bootSector.Data); // FIXME: wrong block #
}
// create FSInfo Structure
if (fatType == FATType.FAT32) {
BinaryFormat infoSector = new BinaryFormat (512);
infoSector.SetUInt (FSInfo.FSI_LeadSignature, 0x41615252);
//FSInfo.FSI_Reserved1
infoSector.SetUInt (FSInfo.FSI_StructureSigature, 0x61417272);
infoSector.SetUInt (FSInfo.FSI_FreeCount, 0xFFFFFFFF);
infoSector.SetUInt (FSInfo.FSI_NextFree, 0xFFFFFFFF);
//FSInfo.FSI_Reserved2
bootSector.SetUInt (FSInfo.FSI_TrailSignature, 0xAA550000);
partition.WriteBlock (1, 1, infoSector.Data);
partition.WriteBlock (7, 1, infoSector.Data);
// create 2nd sector
BinaryFormat secondSector = new BinaryFormat (512);
secondSector.SetUInt ((ushort)FSInfo.FSI_TrailSignature2, 0xAA55);
partition.WriteBlock (2, 1, secondSector.Data);
partition.WriteBlock (8, 1, secondSector.Data);
}
// create fats
/// TODO: incomplete
BinaryFormat emptyFat = new BinaryFormat (512);
// clear primary & secondary fats entries
for (uint i = fatStart; i < fatStart + 1; i++) { //FIXME
partition.WriteBlock (i, 1, emptyFat.Data);
}
// first block is special
BinaryFormat firstFat = new BinaryFormat (512);
// TODO: incomplete
partition.WriteBlock (reservedSectors, 1, emptyFat.Data);
return ReadBootSector ();
}
protected bool ReadBootSector ()
{
valid = false;
if (blockSize != 512) // only going to work with 512 sector sizes (for now)
return false;
BinaryFormat bootSector = new BinaryFormat (partition.ReadBlock (0, 1));
byte bootSignature = bootSector.GetByte (BootSector.ExtendedBootSignature);
if ((bootSignature != 0x29) && (bootSignature != 0x28))
return false;
//TextMode.Write ("EOM NAME: ");
//for (uint i = 0; i < 8; i++)
// TextMode.WriteChar (bootsector.GetByte (BootSector.EOMName + i));
//TextMode.WriteLine ();
bytesPerSector = bootSector.GetUShort (BootSector.BytesPerSector);
sectorsPerCluster = bootSector.GetByte (BootSector.SectorsPerCluster);
reservedSectors = bootSector.GetByte (BootSector.ReservedSectors);
nbrFats = bootSector.GetByte (BootSector.FatAllocationTables);
rootEntries = bootSector.GetUShort (BootSector.MaxRootDirEntries);
uint sectorsPerFat16 = bootSector.GetUShort (BootSector.SectorsPerFAT);
uint sectorsPerFat32 = bootSector.GetUInt (BootSector.FAT32_SectorPerFAT);
uint totalSectors16 = bootSector.GetUShort (BootSector.TotalSectors);
uint totalSectors32 = bootSector.GetUInt (BootSector.FAT32_TotalSectors);
uint sectorsPerFat = (sectorsPerFat16 != 0) ? sectorsPerFat16 : sectorsPerFat32;
uint fatSectors = nbrFats * sectorsPerFat;
clusterSizeInBytes = sectorsPerCluster * blockSize;
rootDirSectors = (((rootEntries * 32) + (bytesPerSector - 1)) / bytesPerSector);
firstDataSector = reservedSectors + (nbrFats * sectorsPerFat) + rootDirSectors;
if (totalSectors16 != 0)
totalSectors = totalSectors16;
else
totalSectors = totalSectors32;
dataSectors = totalSectors - (reservedSectors + (nbrFats * sectorsPerFat) + rootDirSectors);
totalClusters = dataSectors / sectorsPerCluster;
entriesPerSector = (bytesPerSector / 32);
firstRootDirectorySector = reservedSectors + fatSectors;
dataAreaStart = firstRootDirectorySector + rootDirSectors;
fatStart = reservedSectors;
if (totalClusters < 4085)
fatType = FATType.FAT12;
else if (totalClusters < 65525)
fatType = FATType.FAT16;
else
fatType = FATType.FAT32;
if (fatType == FATType.FAT12) {
reserved = 0xFF0;
last = 0x0FF8;
bad = 0x0FF7;
fatMask = 0xFFFFFFFF;
fatEntries = sectorsPerFat * 3 * blockSize / 2;
}
else if (fatType == FATType.FAT16) {
reserved = 0xFFF0;
last = 0xFFF8;
bad = 0xFFF7;
fatMask = 0xFFFFFFFF;
fatEntries = sectorsPerFat * blockSize / 2;
}
else { // if (type == FatType.FAT32) {
reserved = 0xFFF0;
last = 0x0FFFFFF8;
bad = 0x0FFFFFF7;
fatMask = 0x0FFFFFFF;
fatEntries = sectorsPerFat * blockSize / 4;
}
// some basic checks
if ((nbrFats == 0) || (nbrFats > 2))
valid = false;
else if (totalSectors == 0)
valid = false;
else if (sectorsPerFat == 0)
valid = false;
else if (!((fatType == FATType.FAT12) || (fatType == FATType.FAT16))) // no support for Fat32 yet
valid = false;
else
valid = true;
if (valid) {
base.volumeLabel = bootSector.GetString (fatType != FATType.FAT32 ? BootSector.VolumeLabel : BootSector.FAT32_VolumeLabel, 11);
base.serialNbr = bootSector.GetBytes (fatType != FATType.FAT32 ? BootSector.IDSerialNumber : BootSector.FAT32_IDSerialNumber, 4);
}
return valid;
}
public bool Compare (byte[] data, uint offset, FATType type)
{
BinaryFormat entry = new BinaryFormat (data);
byte first = entry.GetByte (offset + Entry.DOSName);
if (first == FileNameAttribute.LastEntry)
return false;
if ((first == FileNameAttribute.Deleted) | (first == FileNameAttribute.Dot))
return false;
if (first == FileNameAttribute.Escape)
return false;
string entryname = FAT.ExtractFileName (data, offset);
if (entryname == name)
return true;
return false;
}
public bool Format ()
{
if (!diskDevice.CanWrite)
return false;
BinaryFormat masterboot = new BinaryFormat (new byte[512]);
masterboot.SetUInt (MasterBootRecord.DiskSignature, diskSignature);
masterboot.SetUShort (MasterBootRecord.MBRSignature, MasterBootConstants.MBRSignature);
if (code != null)
for (uint index = 0; index < MasterBootConstants.CodeAreaSize; index++)
masterboot.SetByte (index, code[index]);
//TODO: write partitions
diskDevice.WriteBlock (0, 1, masterboot.Data);
return true;
}
private bool ReadMasterBootBlock ()
{
valid = false;
if (diskDevice.BlockSize != 512) // only going to work with 512 sector sizes
return false;
BinaryFormat masterboot = new BinaryFormat (diskDevice.ReadBlock (0, 1));
ushort mbrsignature = masterboot.GetUShort (MasterBootRecord.MBRSignature);
diskSignature = masterboot.GetUInt (MasterBootRecord.DiskSignature);
valid = (mbrsignature == MasterBootConstants.MBRSignature);
if (valid) {
for (uint index = 0; index < MaxMBRPartitions; index++) {
uint offset = MasterBootRecord.PrimaryPartitions + (index * 16);
GenericPartition partition = new GenericPartition (index);
partition.Bootable = masterboot.GetByte (offset + PartitionRecord.Status) == 0x80;
partition.PartitionType = masterboot.GetByte (offset + PartitionRecord.PartitionType);
partition.StartLBA = masterboot.GetUInt (offset + PartitionRecord.LBA);
partition.TotalBlocks = masterboot.GetUInt (offset + PartitionRecord.Sectors);
partitions[index] = partition;
}
//TODO: Extended Partitions
}
code = new byte[MasterBootConstants.CodeAreaSize];
for (uint index = 0; index < MasterBootConstants.CodeAreaSize; index++)
code[index] = masterboot.GetByte (index);
return valid;
}
static public uint GetClusterEntry (byte[] data, uint index, FATType type)
{
BinaryFormat entry = new BinaryFormat (data);
uint cluster = entry.GetUShort ((index * Entry.EntrySize) + Entry.FirstCluster);
if (type == FATType.FAT32) {
uint clusterhi = ((uint)entry.GetUShort ((index * Entry.EntrySize) + Entry.EAIndex)) << 16;
cluster = cluster | clusterhi;
}
return cluster;
}
