public FatFileLocation FindEntry(ACompare compare, uint startCluster)
{
uint activeSector = ((startCluster - RootCluster) * SectorsPerCluster) + DataSector;
if (startCluster == 0)
{
activeSector = (FatType == FatType.FAT32) ? GetSectorByCluster(RootCluster) : RootSector;
}
byte[] aData = new byte[512 * SectorsPerCluster];
this.IDevice.Read(activeSector, SectorsPerCluster, aData);
BinaryFormat directory = new BinaryFormat(aData);
for (uint index = 0; index < EntriesPerSector * SectorsPerCluster; index++)
{
Console.WriteLine("Lawl: %d\n" + ((uint)(index * 32)).ToString());
if (compare.Compare(directory.Data, index * 32, FatType))
{
FatFileAttributes attribute = (FatFileAttributes)directory.GetByte((index * Entry.EntrySize) + Entry.FileAttributes);
return(new FatFileLocation(GetClusterEntry(directory.Data, index, FatType), activeSector, index, (attribute & FatFileAttributes.SubDirectory) != 0, directory.GetUInt((index * Entry.EntrySize) + Entry.FileSize)));
}
if (directory.GetByte(Entry.DOSName + (index * Entry.EntrySize)) == FileNameAttribute.LastEntry)
{
return(null);
}
}
return(null);
}
/// <summary>
/// Compares the specified data.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="offset">The offset.</param>
/// <param name="type">The type.</param>
/// <returns></returns>
public bool Compare(byte[] data, uint offset, FatType type)
{
BinaryFormat entry = new BinaryFormat(data);
byte first = entry.GetByte(Entry.DOSName + offset);
if (first == FileNameAttribute.LastEntry)
{
return(false);
}
if ((first == FileNameAttribute.Deleted) | (first == FileNameAttribute.Dot))
{
return(false);
}
if (first == FileNameAttribute.Escape)
{
return(false);
}
FatFileAttributes attribute = (FatFileAttributes)entry.GetByte(Entry.FileAttributes + offset);
if ((attribute & FatFileAttributes.VolumeLabel) == FatFileAttributes.VolumeLabel)
{
return(true);
}
return(false);
}
/// <summary>
/// Reads the master boot block.
/// </summary>
/// <returns></returns>
public bool Read()
{
valid = false;
if (diskDevice.BlockSize != 512)
{
return(false); // only going to work with 512 sector sizes
}
if (diskDevice.TotalBlocks < 3)
{
return(false);
}
BinaryFormat masterboot = new BinaryFormat(diskDevice.ReadBlock(0, 1));
if (masterboot.GetUShort(MBR.MBRSignature) != MBRConstant.MBRSignature)
{
return(false);
}
valid = true;
diskSignature = masterboot.GetUInt(MBR.DiskSignature);
for (uint index = 0; index < MaxMBRPartitions; index++)
{
uint offset = MBR.FirstPartition + (index * MBRConstant.PartitionSize);
GenericPartition partition = new GenericPartition(index);
partition.Bootable = masterboot.GetByte(offset + PartitionRecord.Status) == MBRConstant.Bootable;
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[MBRConstant.CodeAreaSize];
for (uint index = 0; index < MBRConstant.CodeAreaSize; index++)
{
code[index] = masterboot.GetByte(index);
}
return(valid);
}
/// <summary>
/// Compares the specified data.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="offset">The offset.</param>
/// <param name="type">The type.</param>
/// <returns></returns>
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 = FatFileSystem.GetClusterEntry(data, offset, type);
if (startcluster == cluster)
{
return(true);
}
return(false);
}
/// <summary>
/// Compares the specified data.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="offset">The offset.</param>
/// <param name="type">The type.</param>
/// <returns></returns>
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 = FatFileSystem.ExtractFileName(data, offset);
if (entryname == name)
{
return(true);
}
return(false);
}
public override 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(true);
}
//if ((first == FileSystem.FAT.FatFileSystem.FileNameAttribute.Deleted) | (first == FileSystem.FAT.FatFileSystem.FileNameAttribute.Dot))
// return true;
return(false);
}
/// <summary>
/// Compares the specified data.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="offset">The offset.</param>
/// <param name="type">The type.</param>
/// <returns></returns>
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(true);
}
if ((first == FileNameAttribute.Deleted) | (first == FileNameAttribute.Dot))
{
return(true);
}
return(false);
}
public override 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 == FileSystem.FAT.FatFileSystem.FileNameAttribute.Dot)
{
return(false);
}
if (first == FileNameAttribute.Escape)
{
return(false);
}
string entryname = ASCII.GetString(data, (int)offset, 8).Trim();
string entryExt = ASCII.GetString(data, (int)(offset + 8), 3).Trim();
string[] xStr = name.Split('.');
if (xStr.Length > 1)
{
if (entryname.ToLower() == xStr[0].Trim('\0').ToLower() && entryExt.ToLower() == xStr[1].Trim('\0').ToLower())
{
return(true);
}
}
if (entryname.ToLower() == this.name.Trim().ToLower())
{
return(true);
}
return(false);
}
/// <summary>
/// Reads the master boot block.
/// </summary>
/// <returns></returns>
public bool Read()
{
valid = false;
MasterBootBlock mbr = new MasterBootBlock(diskDevice);
if (!mbr.Valid)
{
return(false);
}
if ((mbr.Partitions[0].PartitionType != PartitionType.GPT) ||
(mbr.Partitions[1].PartitionType != PartitionType.Empty) ||
(mbr.Partitions[2].PartitionType != PartitionType.Empty) ||
(mbr.Partitions[3].PartitionType != PartitionType.Empty) ||
(!mbr.Partitions[0].Bootable) || (mbr.Partitions[0].StartLBA != 1))
{
return(false);
}
BinaryFormat gpt = new BinaryFormat(diskDevice.ReadBlock(1, 1));
if ((gpt.GetByte(0) != 45) && (gpt.GetByte(1) != 46) && (gpt.GetByte(2) != 49) && (gpt.GetByte(3) != 20) &&
(gpt.GetByte(4) != 50) && (gpt.GetByte(5) != 41) && (gpt.GetByte(6) != 52) && (gpt.GetByte(7) != 54))
{
return(false);
}
if ((gpt.GetUInt(GPT.Revision) != GPTConstant.SupportedRevision) ||
(gpt.GetUInt(GPT.HeaderSize) != GPTConstant.HeaderSize) ||
(gpt.GetUInt(GPT.Reserved) != 0) ||
(gpt.GetUInt(GPT.PartitionStartingLBA) != 2)
)
{
return(false);
}
valid = true;
return(valid);
}
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 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);
}
