mirror of
https://github.com/ReneLergner/WPinternals.git
synced 2026-06-14 03:16:40 +10:00
Rene Lergner
220 lines
10 KiB
C#
220 lines
10 KiB
C#
//
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// Copyright (c) 2008-2011, Kenneth Bell
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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namespace DiscUtils.Ntfs
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{
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using System;
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using System.Globalization;
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using System.IO;
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internal class BiosParameterBlock
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{
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public string OemId;
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public ushort BytesPerSector;
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public byte SectorsPerCluster;
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public ushort ReservedSectors; // Must be 0
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public byte NumFats; // Must be 0
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public ushort FatRootEntriesCount; // Must be 0
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public ushort TotalSectors16; // Must be 0
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public byte Media; // Must be 0xF8
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public ushort FatSize16; // Must be 0
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public ushort SectorsPerTrack; // Value: 0x3F 0x00
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public ushort NumHeads; // Value: 0xFF 0x00
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public uint HiddenSectors; // Value: 0x3F 0x00 0x00 0x00
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public uint TotalSectors32; // Must be 0
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public byte BiosDriveNumber; // Value: 0x80 (first hard disk)
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public byte ChkDskFlags; // Value: 0x00
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public byte SignatureByte; // Value: 0x80
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public byte PaddingByte; // Value: 0x00
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public long TotalSectors64;
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public long MftCluster;
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public long MftMirrorCluster;
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public byte RawMftRecordSize;
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public byte RawIndexBufferSize;
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public ulong VolumeSerialNumber;
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public int MftRecordSize
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{
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get { return CalcRecordSize(RawMftRecordSize); }
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}
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public int IndexBufferSize
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{
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get { return CalcRecordSize(RawIndexBufferSize); }
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}
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public int BytesPerCluster
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{
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get { return ((int)BytesPerSector) * ((int)SectorsPerCluster); }
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}
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public void Dump(TextWriter writer, string linePrefix)
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{
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writer.WriteLine(linePrefix + "BIOS PARAMETER BLOCK (BPB)");
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writer.WriteLine(linePrefix + " OEM ID: " + OemId);
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writer.WriteLine(linePrefix + " Bytes per Sector: " + BytesPerSector);
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writer.WriteLine(linePrefix + " Sectors per Cluster: " + SectorsPerCluster);
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writer.WriteLine(linePrefix + " Reserved Sectors: " + ReservedSectors);
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writer.WriteLine(linePrefix + " # FATs: " + NumFats);
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writer.WriteLine(linePrefix + " # FAT Root Entries: " + FatRootEntriesCount);
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writer.WriteLine(linePrefix + " Total Sectors (16b): " + TotalSectors16);
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writer.WriteLine(linePrefix + " Media: " + Media.ToString("X", CultureInfo.InvariantCulture) + "h");
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writer.WriteLine(linePrefix + " FAT size (16b): " + FatSize16);
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writer.WriteLine(linePrefix + " Sectors per Track: " + SectorsPerTrack);
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writer.WriteLine(linePrefix + " # Heads: " + NumHeads);
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writer.WriteLine(linePrefix + " Hidden Sectors: " + HiddenSectors);
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writer.WriteLine(linePrefix + " Total Sectors (32b): " + TotalSectors32);
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writer.WriteLine(linePrefix + " BIOS Drive Number: " + BiosDriveNumber);
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writer.WriteLine(linePrefix + " Chkdsk Flags: " + ChkDskFlags);
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writer.WriteLine(linePrefix + " Signature Byte: " + SignatureByte);
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writer.WriteLine(linePrefix + " Total Sectors (64b): " + TotalSectors64);
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writer.WriteLine(linePrefix + " MFT Record Size: " + RawMftRecordSize);
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writer.WriteLine(linePrefix + " Index Buffer Size: " + RawIndexBufferSize);
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writer.WriteLine(linePrefix + " Volume Serial Number: " + VolumeSerialNumber);
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}
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internal static BiosParameterBlock Initialized(Geometry diskGeometry, int clusterSize, uint partitionStartLba, long partitionSizeLba, int mftRecordSize, int indexBufferSize)
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{
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BiosParameterBlock bpb = new BiosParameterBlock();
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bpb.OemId = "NTFS ";
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bpb.BytesPerSector = Sizes.Sector;
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bpb.SectorsPerCluster = (byte)(clusterSize / bpb.BytesPerSector);
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bpb.ReservedSectors = 0;
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bpb.NumFats = 0;
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bpb.FatRootEntriesCount = 0;
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bpb.TotalSectors16 = 0;
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bpb.Media = 0xF8;
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bpb.FatSize16 = 0;
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bpb.SectorsPerTrack = (ushort)diskGeometry.SectorsPerTrack;
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bpb.NumHeads = (ushort)diskGeometry.HeadsPerCylinder;
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bpb.HiddenSectors = partitionStartLba;
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bpb.TotalSectors32 = 0;
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bpb.BiosDriveNumber = 0x80;
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bpb.ChkDskFlags = 0;
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bpb.SignatureByte = 0x80;
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bpb.PaddingByte = 0;
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bpb.TotalSectors64 = partitionSizeLba - 1;
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bpb.RawMftRecordSize = bpb.CodeRecordSize(mftRecordSize);
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bpb.RawIndexBufferSize = bpb.CodeRecordSize(indexBufferSize);
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bpb.VolumeSerialNumber = GenSerialNumber();
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return bpb;
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}
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internal static BiosParameterBlock FromBytes(byte[] bytes, int offset)
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{
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BiosParameterBlock bpb = new BiosParameterBlock();
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bpb.OemId = Utilities.BytesToString(bytes, offset + 0x03, 8);
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bpb.BytesPerSector = Utilities.ToUInt16LittleEndian(bytes, offset + 0x0B);
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bpb.SectorsPerCluster = bytes[offset + 0x0D];
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bpb.ReservedSectors = Utilities.ToUInt16LittleEndian(bytes, offset + 0x0E);
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bpb.NumFats = bytes[offset + 0x10];
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bpb.FatRootEntriesCount = Utilities.ToUInt16LittleEndian(bytes, offset + 0x11);
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bpb.TotalSectors16 = Utilities.ToUInt16LittleEndian(bytes, offset + 0x13);
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bpb.Media = bytes[offset + 0x15];
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bpb.FatSize16 = Utilities.ToUInt16LittleEndian(bytes, offset + 0x16);
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bpb.SectorsPerTrack = Utilities.ToUInt16LittleEndian(bytes, offset + 0x18);
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bpb.NumHeads = Utilities.ToUInt16LittleEndian(bytes, offset + 0x1A);
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bpb.HiddenSectors = Utilities.ToUInt32LittleEndian(bytes, offset + 0x1C);
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bpb.TotalSectors32 = Utilities.ToUInt32LittleEndian(bytes, offset + 0x20);
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bpb.BiosDriveNumber = bytes[offset + 0x24];
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bpb.ChkDskFlags = bytes[offset + 0x25];
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bpb.SignatureByte = bytes[offset + 0x26];
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bpb.PaddingByte = bytes[offset + 0x27];
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bpb.TotalSectors64 = Utilities.ToInt64LittleEndian(bytes, offset + 0x28);
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bpb.MftCluster = Utilities.ToInt64LittleEndian(bytes, offset + 0x30);
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bpb.MftMirrorCluster = Utilities.ToInt64LittleEndian(bytes, offset + 0x38);
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bpb.RawMftRecordSize = bytes[offset + 0x40];
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bpb.RawIndexBufferSize = bytes[offset + 0x44];
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bpb.VolumeSerialNumber = Utilities.ToUInt64LittleEndian(bytes, offset + 0x48);
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return bpb;
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}
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internal void ToBytes(byte[] buffer, int offset)
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{
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Utilities.StringToBytes(OemId, buffer, offset + 0x03, 8);
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Utilities.WriteBytesLittleEndian(BytesPerSector, buffer, offset + 0x0B);
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buffer[offset + 0x0D] = SectorsPerCluster;
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Utilities.WriteBytesLittleEndian(ReservedSectors, buffer, offset + 0x0E);
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buffer[offset + 0x10] = NumFats;
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Utilities.WriteBytesLittleEndian(FatRootEntriesCount, buffer, offset + 0x11);
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Utilities.WriteBytesLittleEndian(TotalSectors16, buffer, offset + 0x13);
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buffer[offset + 0x15] = Media;
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Utilities.WriteBytesLittleEndian(FatSize16, buffer, offset + 0x16);
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Utilities.WriteBytesLittleEndian(SectorsPerTrack, buffer, offset + 0x18);
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Utilities.WriteBytesLittleEndian(NumHeads, buffer, offset + 0x1A);
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Utilities.WriteBytesLittleEndian(HiddenSectors, buffer, offset + 0x1C);
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Utilities.WriteBytesLittleEndian(TotalSectors32, buffer, offset + 0x20);
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buffer[offset + 0x24] = BiosDriveNumber;
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buffer[offset + 0x25] = ChkDskFlags;
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buffer[offset + 0x26] = SignatureByte;
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buffer[offset + 0x27] = PaddingByte;
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Utilities.WriteBytesLittleEndian(TotalSectors64, buffer, offset + 0x28);
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Utilities.WriteBytesLittleEndian(MftCluster, buffer, offset + 0x30);
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Utilities.WriteBytesLittleEndian(MftMirrorCluster, buffer, offset + 0x38);
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buffer[offset + 0x40] = RawMftRecordSize;
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buffer[offset + 0x44] = RawIndexBufferSize;
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Utilities.WriteBytesLittleEndian(VolumeSerialNumber, buffer, offset + 0x48);
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}
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internal int CalcRecordSize(byte rawSize)
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{
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if ((rawSize & 0x80) != 0)
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{
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return 1 << (-(sbyte)rawSize);
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}
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else
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{
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return rawSize * SectorsPerCluster * BytesPerSector;
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}
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}
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private static ulong GenSerialNumber()
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{
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byte[] buffer = new byte[8];
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Random rng = new Random();
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rng.NextBytes(buffer);
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return Utilities.ToUInt64LittleEndian(buffer, 0);
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}
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private byte CodeRecordSize(int size)
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{
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if (size >= BytesPerCluster)
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{
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return (byte)(size / BytesPerCluster);
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}
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else
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{
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sbyte val = 0;
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while (size != 1)
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{
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size = (size >> 1) & 0x7FFFFFFF;
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val++;
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}
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return (byte)-val;
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}
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}
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}
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}
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