WPinternals/Models/GPT.cs

// Copyright (c) 2018, Rene Lergner - wpinternals.net - @Heathcliff74xda
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Xml.Serialization;

namespace WPinternals
{
    [XmlType("Partitions")]
    public class GPT
    {
        private byte[] GPTBuffer;
        private UInt32 HeaderOffset;
        private UInt32 HeaderSize;
        private UInt32 TableOffset;
        private UInt32 TableSize;
        private UInt32 PartitionEntrySize;
        private UInt32 MaxPartitions;
        internal UInt64 FirstUsableSector;
        internal UInt64 LastUsableSector;
        internal bool HasChanged = false;

        [XmlElement("Partition")]
        public List<Partition> Partitions = new List<Partition>();

        public GPT() // Only for serialization
        {
        }

        internal GPT(byte[] GPTBuffer)
        {
            this.GPTBuffer = GPTBuffer;
            UInt32? TempHeaderOffset = ByteOperations.FindAscii(GPTBuffer, "EFI PART");
            if (TempHeaderOffset == null)
                throw new WPinternalsException("Bad GPT");
            HeaderOffset = (UInt32)TempHeaderOffset;
            HeaderSize = ByteOperations.ReadUInt32(GPTBuffer, HeaderOffset + 0x0C);
            TableOffset = HeaderOffset + 0x200;
            FirstUsableSector = ByteOperations.ReadUInt64(GPTBuffer, HeaderOffset + 0x28);
            LastUsableSector = ByteOperations.ReadUInt64(GPTBuffer, HeaderOffset + 0x30);
            MaxPartitions = ByteOperations.ReadUInt32(GPTBuffer, HeaderOffset + 0x50);
            PartitionEntrySize = ByteOperations.ReadUInt32(GPTBuffer, HeaderOffset + 0x54);
            TableSize = MaxPartitions * PartitionEntrySize;
            if ((TableOffset + TableSize) > GPTBuffer.Length)
                throw new WPinternalsException("Bad GPT");

            UInt32 PartitionOffset = TableOffset;

            while (PartitionOffset < (TableOffset + TableSize))
            {
                string Name = ByteOperations.ReadUnicodeString(GPTBuffer, PartitionOffset + 0x38, 0x48).TrimEnd(new char[] { (char)0, ' ' });
                if (Name.Length == 0)
                    break;
                Partition CurrentPartition = new Partition();
                CurrentPartition.Name = Name;
                CurrentPartition.FirstSector = ByteOperations.ReadUInt64(GPTBuffer, PartitionOffset + 0x20);
                CurrentPartition.LastSector = ByteOperations.ReadUInt64(GPTBuffer, PartitionOffset + 0x28);
                CurrentPartition.PartitionTypeGuid = ByteOperations.ReadGuid(GPTBuffer, PartitionOffset + 0x00);
                CurrentPartition.PartitionGuid = ByteOperations.ReadGuid(GPTBuffer, PartitionOffset + 0x10);
                CurrentPartition.Attributes = ByteOperations.ReadUInt64(GPTBuffer, PartitionOffset + 0x30);
                Partitions.Add(CurrentPartition);
                PartitionOffset += PartitionEntrySize;
            }

            HasChanged = false;
        }

        internal Partition GetPartition(string Name)
        {
            return Partitions.Where(p => (string.Compare(p.Name, Name, true) == 0)).FirstOrDefault();
        }

        // Magic!
        // SecureBoot hack for Bootloader Spec A starts here
        internal byte[] InsertHack()
        {
            Partition HackPartition = Partitions.Where(p => (p.Name == "HACK")).FirstOrDefault();
            Partition SBL1 = Partitions.Where(p => (p.Name == "SBL1")).FirstOrDefault();
            Partition SBL2 = Partitions.Where(p => (p.Name == "SBL2")).FirstOrDefault();

            if ((SBL1 == null) || (SBL2 == null))
                throw new WPinternalsException("Bad GPT");

            if (HackPartition == null)
            {
                HackPartition = new Partition();
                HackPartition.Name = "HACK";
                HackPartition.Attributes = SBL2.Attributes;
                HackPartition.FirstSector = SBL1.LastSector;
                HackPartition.LastSector = SBL1.LastSector;

                HackPartition.PartitionTypeGuid = SBL2.PartitionTypeGuid;
                HackPartition.PartitionGuid = SBL2.PartitionGuid;

                Partitions.Add(HackPartition);

                SBL1.LastSector--;

                SBL2.PartitionTypeGuid = new Guid(new byte[] { 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74 });
                SBL2.PartitionGuid = new Guid(new byte[] { 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74, 0x74 });
            }

            HasChanged = true;

            return Rebuild();
        }

        internal byte[] RemoveHack()
        {
            Partition HackPartition = Partitions.Where(p => (p.Name == "HACK")).FirstOrDefault();
            Partition SBL1 = Partitions.Where(p => (p.Name == "SBL1")).FirstOrDefault();
            Partition SBL2 = Partitions.Where(p => (p.Name == "SBL2")).FirstOrDefault();

            if ((SBL1 == null) || (SBL2 == null))
                throw new WPinternalsException("Bad GPT");

            if (HackPartition != null)
            {
                SBL2.PartitionTypeGuid = HackPartition.PartitionTypeGuid;
                SBL2.PartitionGuid = HackPartition.PartitionGuid;

                Partitions.Remove(HackPartition);

                SBL1.LastSector++;
            }

            HasChanged = true;

            return Rebuild();
        }

        internal byte[] Rebuild()
        {
            if (GPTBuffer == null)
            {
                TableSize = 0x4200;
                TableOffset = 0;
                GPTBuffer = new byte[TableSize];
            }
            else
                Array.Clear(GPTBuffer, (int)TableOffset, (int)TableSize);

            UInt32 PartitionOffset = TableOffset;
            foreach (Partition CurrentPartition in Partitions)
            {
                ByteOperations.WriteGuid(GPTBuffer, PartitionOffset + 0x00, CurrentPartition.PartitionTypeGuid);
                ByteOperations.WriteGuid(GPTBuffer, PartitionOffset + 0x10, CurrentPartition.PartitionGuid);
                ByteOperations.WriteUInt64(GPTBuffer, PartitionOffset + 0x20, CurrentPartition.FirstSector);
                ByteOperations.WriteUInt64(GPTBuffer, PartitionOffset + 0x28, CurrentPartition.LastSector);
                ByteOperations.WriteUInt64(GPTBuffer, PartitionOffset + 0x30, CurrentPartition.Attributes);
                ByteOperations.WriteUnicodeString(GPTBuffer, PartitionOffset + 0x38, CurrentPartition.Name, 0x48);

                PartitionOffset += PartitionEntrySize;
            }

            ByteOperations.WriteUInt32(GPTBuffer, HeaderOffset + 0x58, ByteOperations.CRC32(GPTBuffer, TableOffset, TableSize));
            ByteOperations.WriteUInt32(GPTBuffer, HeaderOffset + 0x10, 0);
            ByteOperations.WriteUInt32(GPTBuffer, HeaderOffset + 0x10, ByteOperations.CRC32(GPTBuffer, HeaderOffset, HeaderSize));

            return GPTBuffer;
        }

        internal void MergePartitionsFromFile(string Path, bool RoundToChunks)
        {
            MergePartitions(File.ReadAllText(Path), RoundToChunks);
        }

        internal void MergePartitionsFromStream(Stream Partitions, bool RoundToChunks)
        {
            using (TextReader tr = new StreamReader(Partitions))
            {
                MergePartitions(tr.ReadToEnd(), RoundToChunks);
            }
        }

        internal void MergePartitions(string Xml, bool RoundToChunks, ZipArchive Archive = null)
        {
            GPT GptToMerge;
            if (Xml == null)
                GptToMerge = new GPT();
            else
            {
                XmlSerializer x = new XmlSerializer(typeof(GPT), "");
                MemoryStream s = new MemoryStream(System.Text.Encoding.ASCII.GetBytes(Xml));
                GptToMerge = (GPT)x.Deserialize(s);
                s.Dispose();
            }

            if (Archive != null)
            {
                foreach (Partition NewPartition in GptToMerge.Partitions)
                {
                    ZipArchiveEntry Entry = Archive.Entries.Where(e => ((string.Compare(e.Name, NewPartition.Name, true) == 0) || (e.Name.StartsWith(NewPartition.Name + ".", true, System.Globalization.CultureInfo.GetCultureInfo("en-US"))))).FirstOrDefault();
                    if (Entry == null)
                    {
                        // There is a partition entry in the xml, but this partition is not present in the archive.

                        Partition OldPartition = GetPartition(NewPartition.Name);
                        if (OldPartition == null)
                        {
                            // The partition entry in the xml is also not present in the current partition table.
                            // It must have a know position and length.

                            if (NewPartition.LastSector == 0)
                            {
                                throw new WPinternalsException("Unknown length for partition \"" + NewPartition.Name + "\"");
                            }
                        }
                        else
                        {
                            // The partition entry in the xml is also present in the current partition table.
                            // But since the partition is not present in the archive, the partition cannot be relocated.
                            // If the location of the new partition is specified, it must be the same as the current partition.

                            if ((NewPartition.FirstSector != 0) && (NewPartition.FirstSector != OldPartition.FirstSector))
                                throw new WPinternalsException("Incorrect location for partition \"" + NewPartition.Name + "\"");
                            if ((NewPartition.LastSector != 0) && (NewPartition.LastSector != OldPartition.LastSector))
                                throw new WPinternalsException("Incorrect length for partition \"" + NewPartition.Name + "\"");

                            NewPartition.FirstSector = OldPartition.FirstSector;
                            NewPartition.LastSector = OldPartition.LastSector;
                        }
                    }
                    else
                    {
                        // The partition in the xml is also present in the archive.
                        // If the length is specified in the xml, it must match the file in the archive.

                        ulong StreamLengthInSectors = (ulong)Entry.Length / 0x200;
                        using (DecompressedStream DecompressedStream = new DecompressedStream(Entry.Open()))
                        {
                            try
                            {
                                StreamLengthInSectors = (ulong)DecompressedStream.Length / 0x200;
                            }
                            catch { }
                        }

                        if (NewPartition.LastSector == 0)
                        {
                            NewPartition.SizeInSectors = StreamLengthInSectors;
                        }
                        else
                        {
                            if (NewPartition.SizeInSectors != StreamLengthInSectors)
                                throw new WPinternalsException("Inconsistent length specified for partition \"" + NewPartition.Name + "\"");
                        }
                    }
                }
            }
            else
            {
                foreach (Partition NewPartition in GptToMerge.Partitions)
                {
                    // This is a partition entry in the xml, and there is no archive.

                    Partition OldPartition = GetPartition(NewPartition.Name);
                    if (OldPartition == null)
                    {
                        // The partition entry in the xml is also not present in the current partition table.
                        // It must have a known position and length.

                        if (NewPartition.LastSector == 0)
                        {
                            throw new WPinternalsException("Unknown length for partition \"" + NewPartition.Name + "\"");
                        }
                    }
                    else
                    {
                        // The partition entry in the xml is also present in the current partition table.
                        // But since the partition is not present in the archive, the partition cannot be relocated.
                        // If the location of the new partition is specified, it must be the same as the current partition.

                        if ((NewPartition.FirstSector != 0) && (NewPartition.FirstSector != OldPartition.FirstSector))
                            throw new WPinternalsException("Incorrect location for partition \"" + NewPartition.Name + "\"");
                        if ((NewPartition.LastSector != 0) && (NewPartition.LastSector != OldPartition.LastSector))
                            throw new WPinternalsException("Incorrect length for partition \"" + NewPartition.Name + "\"");

                        NewPartition.FirstSector = OldPartition.FirstSector;
                        NewPartition.LastSector = OldPartition.LastSector;
                    }
                }
            }

            List<Partition> DynamicPartitions = new List<Partition>();
            if (Archive != null)
            {
                // Partitions which are present in the archive, and which have no start-sector in the new GPT data (dynamic relocation),
                // and which can be clustered to the end of emmc, are first removed from the existing GPT.
                IEnumerable<Partition> SortedPartitions = Partitions.OrderBy(p => p.FirstSector);
                for (int i = SortedPartitions.Count() - 1; i >= 0; i--)
                {
                    Partition OldPartition = SortedPartitions.ElementAt(i);

                    // Present in archive?
                    ZipArchiveEntry Entry = Archive.Entries.Where(e => ((string.Compare(e.Name, OldPartition.Name, true) == 0) || (e.Name.StartsWith(OldPartition.Name + ".", true, System.Globalization.CultureInfo.GetCultureInfo("en-US"))))).FirstOrDefault();
                    if (Entry != null)
                    {
                        // Not present in new GPT or present in GPT without FirstSector?
                        Partition NewPartition = GptToMerge.GetPartition(OldPartition.Name);
                        if ((NewPartition == null) || (NewPartition.FirstSector == 0))
                        {
                            DynamicPartitions.Insert(0, OldPartition);
                            this.Partitions.Remove(OldPartition);
                        }
                        else
                            break;
                    }
                    else
                        break;
                }
            }

            // All partitions in the new GPT data should have a start-sector and end-sector by now.
            // The partitions in the new GPT data will be applied to the current partition-table.
            // Existing partitions, which are overwritten by the new partitions will be removed from the existing GPT.
            // Existing partition with the same name in the existing GPT is reused (guids and attribs remain, if not specified).
            UInt64 LowestSector = 0;
            Partition DPP = this.GetPartition("DPP");
            if (DPP != null)
                LowestSector = DPP.LastSector + 1;
            foreach (Partition NewPartition in GptToMerge.Partitions)
            {
                // If the new partition is a dynamic partition, then skip it here. It will be added later.
                if (DynamicPartitions.Select(p => p.Name).Any(n => string.Compare(n, NewPartition.Name, true) == 0))
                    continue;

                // Sanity check
                if (NewPartition.FirstSector < LowestSector)
                    throw new WPinternalsException("Bad sector alignment for partition: " + NewPartition.Name);

                Partition CurrentPartition = this.GetPartition(NewPartition.Name);
                if (CurrentPartition == null)
                {
                    CurrentPartition = new Partition();
                    CurrentPartition.Name = NewPartition.Name;
                    this.Partitions.Add(CurrentPartition);
                    HasChanged = true;
                }

                if ((NewPartition.FirstSector != 0) && (NewPartition.FirstSector != CurrentPartition.FirstSector))
                {
                    CurrentPartition.FirstSector = NewPartition.FirstSector;
                    HasChanged = true;
                }
                if ((NewPartition.LastSector != 0) && (NewPartition.LastSector != CurrentPartition.LastSector))
                {
                    CurrentPartition.LastSector = NewPartition.LastSector;
                    HasChanged = true;
                }
                if ((NewPartition.Attributes != 0) && (CurrentPartition.Attributes != NewPartition.Attributes))
                {
                    CurrentPartition.Attributes = NewPartition.Attributes;
                    HasChanged = true;
                }

                if ((NewPartition.PartitionGuid == null) || (NewPartition.PartitionGuid != CurrentPartition.PartitionGuid))
                    HasChanged = true;
                if (NewPartition.PartitionGuid != null)
                    CurrentPartition.PartitionGuid = NewPartition.PartitionGuid;
                if (CurrentPartition.PartitionGuid == null)
                    CurrentPartition.PartitionGuid = Guid.NewGuid();

                if ((NewPartition.PartitionTypeGuid == null) || (NewPartition.PartitionTypeGuid != CurrentPartition.PartitionTypeGuid))
                    HasChanged = true;
                if (NewPartition.PartitionTypeGuid != null)
                    CurrentPartition.PartitionTypeGuid = NewPartition.PartitionTypeGuid;
                if (CurrentPartition.PartitionTypeGuid == null)
                    CurrentPartition.PartitionTypeGuid = Guid.NewGuid();

                for (int i = this.Partitions.Count - 1; i >= 0; i--)
                {
                    if (this.Partitions[i] != CurrentPartition)
                    {
                        if ((CurrentPartition.FirstSector <= this.Partitions[i].LastSector) && (CurrentPartition.LastSector >= this.Partitions[i].FirstSector))
                        {
                            this.Partitions.RemoveAt(i);
                            HasChanged = true;
                        }
                    }
                }
            }

            if (Archive != null)
            {
                // All partitions listed in the archive, which are present in the existing GPT, should overwrite the existing partition.
                // Check if the sizes of the partitions in the archive do not exceed the size of the partition, as listed in the GPT.
                foreach (Partition OldPartition in this.Partitions)
                {
                    ZipArchiveEntry Entry = Archive.Entries.Where(e => ((string.Compare(e.Name, OldPartition.Name, true) == 0) || (e.Name.StartsWith(OldPartition.Name + ".", true, System.Globalization.CultureInfo.GetCultureInfo("en-US"))))).FirstOrDefault();
                    if (Entry != null)
                    {
                        DecompressedStream DecompressedStream = new DecompressedStream(Entry.Open());
                        ulong StreamLengthInSectors = (ulong)Entry.Length / 0x200;
                        try
                        {
                            StreamLengthInSectors = (ulong)DecompressedStream.Length / 0x200;
                        }
                        catch { }
                        DecompressedStream.Close();

                        UInt64 MaxPartitionSizeInSectors = OldPartition.SizeInSectors;
                        Partition NextPartition = this.Partitions.Where(p => p.FirstSector > OldPartition.FirstSector).OrderBy(p => p.FirstSector).FirstOrDefault();
                        if (NextPartition != null)
                            MaxPartitionSizeInSectors = NextPartition.FirstSector - OldPartition.FirstSector;
                        if (StreamLengthInSectors > MaxPartitionSizeInSectors)
                        {
                            throw new WPinternalsException("Incorrect length for partition \"" + OldPartition.Name + "\"");
                        }

                        if (OldPartition.SizeInSectors != StreamLengthInSectors)
                        {
                            OldPartition.SizeInSectors = StreamLengthInSectors;
                            HasChanged = true;
                        }
                    }
                }

                // All remaining partitions in the archive, which were listed in the original GPT, 
                // should be added at the end of the partition-table.
                UInt64 FirstFreeSector = 0x5000;
                if (this.Partitions.Count > 0)
                {
                    FirstFreeSector = this.Partitions.Max(p => p.LastSector) + 1;

                    // Always start a new partition on a new chunk (0x100 sector boundary), to be more flexible during custom flash
                    if (RoundToChunks && (((double)FirstFreeSector % 0x100) != 0))
                        FirstFreeSector = (UInt64)(Math.Ceiling((double)FirstFreeSector / 0x100) * 0x100);

                }
                foreach (Partition NewPartition in DynamicPartitions)
                {
                    if (NewPartition.FirstSector != FirstFreeSector)
                    {
                        NewPartition.FirstSector = FirstFreeSector;
                        HasChanged = true;
                    }
                    ZipArchiveEntry Entry = Archive.Entries.Where(e => ((string.Compare(e.Name, NewPartition.Name, true) == 0) || (e.Name.StartsWith(NewPartition.Name + ".", true, System.Globalization.CultureInfo.GetCultureInfo("en-US"))))).FirstOrDefault();
                    DecompressedStream DecompressedStream = new DecompressedStream(Entry.Open());
                    ulong StreamLengthInSectors = (ulong)Entry.Length / 0x200;
                    try
                    {
                        StreamLengthInSectors = (ulong)DecompressedStream.Length / 0x200;
                    }
                    catch { }
                    DecompressedStream.Close();
                    if (NewPartition.SizeInSectors != StreamLengthInSectors)
                    {
                        NewPartition.SizeInSectors = StreamLengthInSectors;
                        HasChanged = true;
                    }
                    this.Partitions.Add(NewPartition);
                    FirstFreeSector += StreamLengthInSectors;

                    // Always start a new partition on a new chunk (0x100 sector boundary), to be more flexible during custom flash
                    if (RoundToChunks && (((double)FirstFreeSector % 0x100) != 0))
                        FirstFreeSector = (UInt64)(Math.Ceiling((double)FirstFreeSector / 0x100) * 0x100);
                }
            }

            Rebuild();
        }

        internal void WritePartitions(string Path)
        {
            string DirPath = System.IO.Path.GetDirectoryName(Path);
            if (!Directory.Exists(DirPath))
                Directory.CreateDirectory(DirPath);

            XmlSerializer x = new XmlSerializer(typeof(GPT), "");

            XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
            ns.Add("", "");
            System.IO.StreamWriter FileWriter = new System.IO.StreamWriter(Path);
            x.Serialize(FileWriter, this, ns);
            FileWriter.Close();
        }

        internal static GPT ReadPartitions(string Path)
        {
            XmlSerializer x = new XmlSerializer(typeof(GPT), "");
            using (FileStream s = new FileStream(Path, FileMode.Open))
            {
                return (GPT)x.Deserialize(s);
            }
        }

        internal void RestoreBackupPartitions()
        {
            // This is necessary, because the partitions and backup-partitions can exchange.
            // This may cause the startsector to be higher than the maximum allowed sector for flashing with a Lumia V1 programmer (hardcoded in programmer)
            List<string> RevisePartitions = new List<string>(new string[] { "SBL1", "SBL2", "SBL3", "UEFI", "TZ", "RPM", "WINSECAPP" });
            foreach (string RevisePartitionName in RevisePartitions)
            {
                Partition RevisePartition = GetPartition(RevisePartitionName);
                Partition ReviseBackupPartition = GetPartition("BACKUP_" + RevisePartitionName);
                if ((RevisePartition != null) && (ReviseBackupPartition != null) && (RevisePartition.FirstSector > ReviseBackupPartition.FirstSector))
                {
                    ulong OriginalFirstSector = RevisePartition.FirstSector;
                    ulong OriginalLastSector = RevisePartition.LastSector;
                    RevisePartition.FirstSector = ReviseBackupPartition.FirstSector;
                    RevisePartition.LastSector = ReviseBackupPartition.LastSector;
                    ReviseBackupPartition.FirstSector = OriginalFirstSector;
                    ReviseBackupPartition.LastSector = OriginalLastSector;

                    HasChanged = true;
                }

                if (RevisePartition.LastSector >= 0xF400)
                    throw new WPinternalsException("Unsupported partition layout!");
            }

        }
    }

    public class Partition
    {
        private UInt64 _SizeInSectors;
        private UInt64 _FirstSector;
        private UInt64 _LastSector;

        public string Name;            // 0x48
        public Guid PartitionTypeGuid; // 0x10
        public Guid PartitionGuid;     // 0x10
        [XmlIgnore]
        internal UInt64 Attributes;      // 0x08

        [XmlIgnore]
        internal UInt64 SizeInSectors
        {
            get
            {
                if (_SizeInSectors != 0)
                    return _SizeInSectors;
                else
                    return LastSector - FirstSector + 1;
            }
            set
            {
                _SizeInSectors = value;
                if (FirstSector != 0)
                    LastSector = FirstSector + _SizeInSectors - 1;
            }
        }

        [XmlIgnore]
        internal UInt64 FirstSector // 0x08
        {
            get
            {
                return _FirstSector;
            }
            set
            {
                _FirstSector = value;
                if (_SizeInSectors != 0)
                    _LastSector = FirstSector + _SizeInSectors - 1;
            }
        }

        [XmlIgnore]
        internal UInt64 LastSector // 0x08
        {
            get
            {
                return _LastSector;
            }
            set
            {
                _LastSector = value;
                _SizeInSectors = 0;
            }
        }

        [XmlIgnore]
        public string Volume
        {
            get
            {
                return @"\\?\Volume" + PartitionGuid.ToString("b") + @"\";
            }
        }

        [XmlElement(ElementName = "FirstSector")]
        public string FirstSectorAsString
        {
            get
            {
                return "0x" + FirstSector.ToString("X16");
            }
            set
            {
                FirstSector = Convert.ToUInt64(value, 16);
            }
        }

        [XmlElement(ElementName = "LastSector")]
        public string LastSectorAsString
        {
            get
            {
                return "0x" + LastSector.ToString("X16");
            }
            set
            {
                LastSector = Convert.ToUInt64(value, 16);
            }
        }

        [XmlElement(ElementName = "Attributes")]
        public string AttributesAsString
        {
            get
            {
                return "0x" + Attributes.ToString("X16");
            }
            set
            {
                Attributes = Convert.ToUInt64(value, 16);
            }
        }
    }
}