public static MftEntry Read(BinaryReader reader)
{
var entry = new MftEntry()
{
offset = reader.ReadInt64(),
size = reader.ReadInt32(),
compression = reader.ReadUInt16(),
flags = reader.ReadUInt16(),
counter = reader.ReadUInt32(),
crc = reader.ReadUInt32(),
};
return(entry);
}
public static Mft ReadMft(BinaryReader r)
{
var mft = new Mft();
mft.header = r.ReadBytes(40);
//check version and header size
if (BitConverter.ToUInt32(mft.header, 0) != 441336215U || BitConverter.ToInt32(mft.header, 4) != 40)
{
throw new IOException("Unknown header");
}
r.BaseStream.Position = mft.MftOffset;
if (r.ReadUInt32() != 443835981U)
{
throw new IOException("Unknown MFT header");
}
r.BaseStream.Position += 8; //junk
var count = r.ReadUInt32() - 1; //this header was counted as an entry
r.BaseStream.Position += 8; //0
var entries = mft.entries = new MftEntry[count];
for (var i = 0; i < count; i++)
{
entries[i] = MftEntry.Read(r);
}
var e = entries[1];
if (e.compression != 0)
{
throw new IOException("File is compressed");
}
var size = e.size;
r.BaseStream.Position = e.offset;
while (size > 0)
{
var id = r.ReadInt32();
var i = r.ReadInt32();
if (i > 0)
{
var entry = entries[i - 1];
if (entry.baseId == 0)
{
entry.baseId = id;
entry.fileId = id;
}
else if (id < entry.baseId)
{
entry.baseId = id;
}
else if (id > entry.fileId)
{
entry.fileId = id;
}
}
size -= 8;
}
return(mft);
}
public static MftEntry[] Read(string path)
{
MftEntry[] entries;
using (var r = new BinaryReader(new BufferedStream(File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))))
{
int id, size, compression;
long offset;
r.BaseStream.Position = 24;
offset = r.ReadInt64();
size = r.ReadInt32();
//earch entry is 24 bytes - skipping to the 3rd entry, which points to the ids
r.BaseStream.Position = offset + 48;
entries = new MftEntry[size / 24];
offset = r.ReadInt64();
size = r.ReadInt32();
compression = r.ReadInt16();
if (compression != 0)
{
throw new IOException("File is compressed");
}
//each entry is 8 bytes - file id + index
r.BaseStream.Position = offset;
do
{
id = r.ReadInt32();
int i = r.ReadInt32();
MftEntry entry = entries[i];
if (entry == null)
{
entry = entries[i] = new MftEntry()
{
baseId = id,
fileId = id
};
}
else
{
if (id < entry.baseId)
{
entry.baseId = id;
}
if (id > entry.fileId)
{
entry.fileId = id;
}
}
size -= 8;
}while (size > 0);
}
return(entries);
}
public static MftEntry[] Read(string path)
{
MftEntry[] entries;
using (var r = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
int length = 1024000;
byte[] buffer = new byte[length];
int read, id, size, compression;
long offset;
read = r.Read(buffer, 0, 35);
if (read < 35)
{
throw new IOException();
}
byte version = buffer[0];
id = buffer[1] | buffer[2] << 8 | buffer[3] << 16;
offset = (uint)(buffer[24] | buffer[25] << 8 | buffer[26] << 16 | buffer[27] << 24) | (long)(buffer[28] | buffer[29] << 8 | buffer[30] << 16 | buffer[31] << 24) << 32;
size = buffer[32] | buffer[33] << 8 | buffer[34] << 16 | buffer[35] << 24;
//earch entry is 24 bytes - skipping to the 3rd entry, which points to the ids
r.Position = offset + 48;
entries = new MftEntry[size / 24];
read = r.Read(buffer, 0, 24);
if (read < 24)
{
throw new IOException();
}
offset = (uint)(buffer[0] | buffer[1] << 8 | buffer[2] << 16 | buffer[3] << 24) | (long)(buffer[4] | buffer[5] << 8 | buffer[6] << 16 | buffer[7] << 24) << 32;
size = buffer[8] | buffer[9] << 8 | buffer[10] << 16 | buffer[11] << 24;
compression = buffer[12] << 8 | buffer[13];
if (compression != 0)
{
throw new IOException("Unable to compress file table");
}
//each entry is 8 bytes - file id + index
do
{
r.Position = offset;
int l;
if (size < length)
{
l = size;
}
else
{
l = length;
}
read = r.Read(buffer, 0, l);
if (read == 0)
{
throw new IOException("Unable to read data");
}
if ((l = read % 8) != 0)
{
read -= l;
}
offset += read;
size -= read;
for (l = read / 8, read = 0; l > 0; l--)
{
id = buffer[read++] | buffer[read++] << 8 | buffer[read++] << 16 | buffer[read++] << 24;
int i = buffer[read++] | buffer[read++] << 8 | buffer[read++] << 16 | buffer[read++] << 24;
MftEntry entry = entries[i];
if (entry == null)
{
entry = entries[i] = new MftEntry()
{
baseId = id,
fileId = id
};
}
else
{
if (id < entry.baseId)
{
entry.baseId = id;
}
if (id > entry.fileId)
{
entry.fileId = id;
}
}
}
}while (size > 0);
}
return(entries);
}