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Early Windows NT Kernel Version Reader for builds lower than 328. (Confirmed working with 196, 239)
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// Copyright (c) 2020, Gustave Monce - gus33000.me - @gus33000 | |
// | |
// 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. | |
// Below notice is for the ByteOperations class written by Rene Lergner | |
// 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. | |
// These functions assume same endianness for the CPU architecture and the raw data it reads from or writes to. | |
using System; | |
using System.Collections.Generic; | |
using System.IO; | |
using System.Linq; | |
namespace ENTVerReader | |
{ | |
class Program | |
{ | |
public static byte[] VersionInformationPatternIntel = new byte[] { 0x68, 0xFF, 0xFF, 0x00, 0x00, 0x6A, 0xFF, 0x68 }; | |
public static byte[] VersionInformationMaskIntel = new byte[] { 0x00, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0xFF, 0x00 }; | |
// Only tested with one build! | |
public static byte[] VersionInformationPatternR4000 = new byte[] { | |
0xFF, 0xFF, 0x09, 0x24, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | |
0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x07, 0x24 }; | |
public static byte[] VersionInformationMaskR4000 = new byte[] { | |
0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, | |
0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00 }; | |
static Byte Arch = 1; // 0: Intel, 1: R4000 | |
static void Main(string[] args) | |
{ | |
string filePath = @"D:\NTOSKRNL.EXE"; | |
Console.WriteLine($"File: {filePath}"); | |
Console.WriteLine("Searching patterns..."); | |
List<byte[]> patternsFound = new List<byte[]>(); | |
UInt32? Offset = 0; | |
do | |
{ | |
byte[] versionBuffer; | |
if (Arch == 0) | |
Offset = ByteOperations.FindPatternInFile(filePath, VersionInformationPatternIntel, VersionInformationMaskIntel, Offset.Value, out versionBuffer); | |
else if (Arch == 1) | |
Offset = ByteOperations.FindPatternInFile(filePath, VersionInformationPatternR4000, VersionInformationMaskR4000, Offset.Value, out versionBuffer); | |
else | |
throw new InvalidDataException(); | |
if (Offset != null) | |
{ | |
patternsFound.Add(versionBuffer); | |
Offset++; | |
} | |
} | |
while (Offset != null); | |
Console.WriteLine($"Found {patternsFound.Count} pattern{(patternsFound.Count > 1 ? "s" : "")}"); | |
Console.WriteLine("Filtering results based on known format differences..."); | |
patternsFound = patternsFound.Where(versionBuffer => | |
{ | |
UInt16 BuildNumber = 255; | |
Byte MajorVersion = 255; | |
if (Arch == 0) | |
{ | |
BuildNumber = ByteOperations.ReadUInt16(versionBuffer, 1); | |
MajorVersion = ByteOperations.ReadUInt8(versionBuffer, 6); | |
} | |
else if (Arch == 1) | |
{ | |
BuildNumber = ByteOperations.ReadUInt16(versionBuffer, 0); | |
MajorVersion = ByteOperations.ReadUInt8(versionBuffer, 0x1C); | |
} | |
if (BuildNumber >= 328) | |
return false; | |
if (MajorVersion > 1) | |
return false; | |
return true; | |
}).ToList(); | |
Console.WriteLine($"Found {patternsFound.Count} pattern{(patternsFound.Count > 1 ? "s" : "")} after filtering"); | |
foreach (byte[] versionBuffer in patternsFound) | |
{ | |
UInt16 BuildNumber = 255; | |
Byte MajorVersion = 255; | |
if (Arch == 0) | |
{ | |
BuildNumber = ByteOperations.ReadUInt16(versionBuffer, 1); | |
MajorVersion = ByteOperations.ReadUInt8(versionBuffer, 6); | |
} | |
else if (Arch == 1) | |
{ | |
BuildNumber = ByteOperations.ReadUInt16(versionBuffer, 0); | |
MajorVersion = ByteOperations.ReadUInt8(versionBuffer, 0x1C); | |
} | |
Console.WriteLine($"Microsoft Windows NT ({MajorVersion}.{BuildNumber}) ({(Arch == 1 ? "R4000" : "I386")})"); | |
} | |
} | |
} | |
internal static class ByteOperations | |
{ | |
internal static string ReadAsciiString(byte[] ByteArray, UInt32 Offset, UInt32 Length) | |
{ | |
byte[] Bytes = new byte[Length]; | |
Buffer.BlockCopy(ByteArray, (int)Offset, Bytes, 0, (int)Length); | |
return System.Text.Encoding.ASCII.GetString(Bytes); | |
} | |
internal static string ReadUnicodeString(byte[] ByteArray, UInt32 Offset, UInt32 Length) | |
{ | |
byte[] Bytes = new byte[Length]; | |
Buffer.BlockCopy(ByteArray, (int)Offset, Bytes, 0, (int)Length); | |
return System.Text.Encoding.Unicode.GetString(Bytes); | |
} | |
internal static void WriteAsciiString(byte[] ByteArray, UInt32 Offset, string Text, UInt32? MaxBufferLength = null) | |
{ | |
if (MaxBufferLength != null) | |
Array.Clear(ByteArray, (int)Offset, (int)MaxBufferLength); | |
byte[] TextBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(Text); | |
int WriteLength = TextBytes.Length; | |
if (WriteLength > MaxBufferLength) | |
WriteLength = (int)MaxBufferLength; | |
Buffer.BlockCopy(TextBytes, 0, ByteArray, (int)Offset, WriteLength); | |
} | |
internal static void WriteUnicodeString(byte[] ByteArray, UInt32 Offset, string Text, UInt32? MaxBufferLength = null) | |
{ | |
if (MaxBufferLength != null) | |
Array.Clear(ByteArray, (int)Offset, (int)MaxBufferLength); | |
byte[] TextBytes = System.Text.UnicodeEncoding.Unicode.GetBytes(Text); | |
int WriteLength = TextBytes.Length; | |
if (WriteLength > MaxBufferLength) | |
WriteLength = (int)MaxBufferLength; | |
Buffer.BlockCopy(TextBytes, 0, ByteArray, (int)Offset, WriteLength); | |
} | |
internal static UInt32 ReadUInt32(byte[] ByteArray, UInt32 Offset) | |
{ | |
return BitConverter.ToUInt32(ByteArray, (int)Offset); | |
} | |
internal static void WriteUInt32(byte[] ByteArray, UInt32 Offset, UInt32 Value) | |
{ | |
System.Buffer.BlockCopy(BitConverter.GetBytes(Value), 0, ByteArray, (int)Offset, 4); | |
} | |
internal static Int32 ReadInt32(byte[] ByteArray, UInt32 Offset) | |
{ | |
return BitConverter.ToInt32(ByteArray, (int)Offset); | |
} | |
internal static void WriteInt32(byte[] ByteArray, UInt32 Offset, Int32 Value) | |
{ | |
System.Buffer.BlockCopy(BitConverter.GetBytes(Value), 0, ByteArray, (int)Offset, 4); | |
} | |
internal static UInt16 ReadUInt16(byte[] ByteArray, UInt32 Offset) | |
{ | |
return BitConverter.ToUInt16(ByteArray, (int)Offset); | |
} | |
internal static void WriteUInt16(byte[] ByteArray, UInt32 Offset, UInt16 Value) | |
{ | |
System.Buffer.BlockCopy(BitConverter.GetBytes(Value), 0, ByteArray, (int)Offset, 2); | |
} | |
internal static Int16 ReadInt16(byte[] ByteArray, UInt32 Offset) | |
{ | |
return BitConverter.ToInt16(ByteArray, (int)Offset); | |
} | |
internal static void WriteInt16(byte[] ByteArray, UInt32 Offset, Int16 Value) | |
{ | |
System.Buffer.BlockCopy(BitConverter.GetBytes(Value), 0, ByteArray, (int)Offset, 2); | |
} | |
internal static byte ReadUInt8(byte[] ByteArray, UInt32 Offset) | |
{ | |
return ByteArray[Offset]; | |
} | |
internal static void WriteUInt8(byte[] ByteArray, UInt32 Offset, byte Value) | |
{ | |
ByteArray[Offset] = Value; | |
} | |
internal static UInt32 ReadUInt24(byte[] ByteArray, UInt32 Offset) | |
{ | |
return (UInt32)(ByteArray[Offset] + (ByteArray[Offset + 1] << 8) + (ByteArray[Offset + 2] << 16)); | |
} | |
internal static void WriteUInt24(byte[] ByteArray, UInt32 Offset, UInt32 Value) | |
{ | |
System.Buffer.BlockCopy(BitConverter.GetBytes(Value), 0, ByteArray, (int)Offset, 3); | |
} | |
internal static UInt64 ReadUInt64(byte[] ByteArray, UInt32 Offset) | |
{ | |
return BitConverter.ToUInt64(ByteArray, (int)Offset); | |
} | |
internal static void WriteUInt64(byte[] ByteArray, UInt32 Offset, UInt64 Value) | |
{ | |
System.Buffer.BlockCopy(BitConverter.GetBytes(Value), 0, ByteArray, (int)Offset, 8); | |
} | |
internal static Guid ReadGuid(byte[] ByteArray, UInt32 Offset) | |
{ | |
byte[] GuidBuffer = new byte[0x10]; | |
Buffer.BlockCopy(ByteArray, (int)Offset, GuidBuffer, 0, 0x10); | |
return new Guid(GuidBuffer); | |
} | |
internal static void WriteGuid(byte[] ByteArray, UInt32 Offset, Guid Value) | |
{ | |
Buffer.BlockCopy(Value.ToByteArray(), 0, ByteArray, (int)Offset, 0x10); | |
} | |
internal static UInt32 Align(UInt32 Base, UInt32 Offset, UInt32 Alignment) | |
{ | |
if (((Offset - Base) % Alignment) == 0) | |
return Offset; | |
else | |
return ((((Offset - Base) / Alignment) + 1) * Alignment) + Base; | |
} | |
internal static UInt32? FindPatternInFile(string FileName, byte[] Pattern, byte[] Mask, UInt32 Offset, out byte[] OutPattern) | |
{ | |
// The mask is optional. | |
// In the mask 0x00 means the value must match, and 0xFF means that this position is a wildcard. | |
UInt32? Result = null; | |
FileStream Stream = new FileStream(FileName, FileMode.Open, FileAccess.Read); | |
byte[] Buffer = new byte[0x10000 + Pattern.Length - 1]; | |
UInt32 BufferReadPosition = 0; // Position in buffer where file-chunk is being read. | |
UInt32 BytesInBuffer = 0; | |
UInt32 BytesRead; | |
UInt32 SearchPositionFile = 0; | |
UInt32 SearchPositionBuffer = 0; | |
UInt32 BufferFileOffset = 0; // Offset in file where data from buffer is located. | |
bool Match = false; | |
int i; | |
OutPattern = null; | |
Stream.Seek(Offset, SeekOrigin.Begin); | |
SearchPositionFile = Offset; | |
while (SearchPositionFile <= (Stream.Length - Pattern.Length)) | |
{ | |
if ((SearchPositionBuffer + Pattern.Length) > BytesInBuffer) | |
{ | |
// Need to read next chunk | |
if ((BytesInBuffer - SearchPositionBuffer) > 0) | |
{ | |
System.Buffer.BlockCopy(Buffer, (int)SearchPositionBuffer, Buffer, 0, (int)(BytesInBuffer - SearchPositionBuffer)); | |
} | |
BufferReadPosition = BytesInBuffer - SearchPositionBuffer; | |
BytesInBuffer -= SearchPositionBuffer; | |
BufferFileOffset += SearchPositionBuffer; | |
SearchPositionBuffer = 0; | |
BytesRead = (UInt32)Stream.Read(Buffer, (int)BufferReadPosition, Buffer.Length - (int)BufferReadPosition); | |
BytesInBuffer += BytesRead; | |
} | |
Match = true; | |
for (i = 0; i < Pattern.Length; i++) | |
{ | |
if (Buffer[SearchPositionBuffer + i] != Pattern[i]) | |
if ((Mask == null) || (Mask[i] == 0)) | |
{ | |
Match = false; | |
break; | |
} | |
} | |
if (Match) | |
{ | |
Result = SearchPositionFile; | |
OutPattern = new byte[Pattern.Length]; | |
System.Buffer.BlockCopy(Buffer, (int)SearchPositionBuffer, OutPattern, 0, Pattern.Length); | |
break; | |
} | |
SearchPositionBuffer++; | |
SearchPositionFile++; | |
} | |
Stream.Close(); | |
return Result; | |
} | |
internal static UInt32? FindAscii(byte[] SourceBuffer, string Pattern) | |
{ | |
return FindPattern(SourceBuffer, System.Text.ASCIIEncoding.ASCII.GetBytes((string)Pattern), null, null); | |
} | |
internal static UInt32? FindUnicode(byte[] SourceBuffer, string Pattern) | |
{ | |
return FindPattern(SourceBuffer, System.Text.UnicodeEncoding.Unicode.GetBytes((string)Pattern), null, null); | |
} | |
internal static UInt32? FindUint(byte[] SourceBuffer, UInt32 Pattern) | |
{ | |
return FindPattern(SourceBuffer, BitConverter.GetBytes((UInt32)Pattern), null, null); | |
} | |
internal static UInt32? FindPattern(byte[] SourceBuffer, byte[] Pattern, byte[] Mask, byte[] OutPattern) | |
{ | |
return FindPattern(SourceBuffer, 0, null, Pattern, Mask, OutPattern); | |
} | |
internal static bool Compare(byte[] Array1, byte[] Array2) | |
{ | |
return System.Collections.StructuralComparisons.StructuralEqualityComparer.Equals(Array1, Array2); | |
} | |
internal static UInt32? FindPattern(byte[] SourceBuffer, uint SourceOffset, uint? SourceSize, byte[] Pattern, byte[] Mask, byte[] OutPattern) | |
{ | |
// The mask is optional. | |
// In the mask 0x00 means the value must match, and 0xFF means that this position is a wildcard. | |
UInt32? Result = null; | |
UInt32 SearchPosition = SourceOffset; | |
bool Match = false; | |
int i; | |
while ((SearchPosition <= (SourceBuffer.Length - Pattern.Length)) && ((SourceSize == null) || (SearchPosition <= (SourceOffset + SourceSize - Pattern.Length)))) | |
{ | |
Match = true; | |
for (i = 0; i < Pattern.Length; i++) | |
{ | |
if (SourceBuffer[SearchPosition + i] != Pattern[i]) | |
if ((Mask == null) || (Mask[i] == 0)) | |
{ | |
Match = false; | |
break; | |
} | |
} | |
if (Match) | |
{ | |
Result = SearchPosition; | |
if (OutPattern != null) | |
System.Buffer.BlockCopy(SourceBuffer, (int)SearchPosition, OutPattern, 0, Pattern.Length); | |
break; | |
} | |
SearchPosition++; | |
} | |
return Result; | |
} | |
internal static byte CalculateChecksum8(byte[] Buffer, UInt32 Offset, UInt32 Size) | |
{ | |
byte Checksum = 0; | |
for (UInt32 i = Offset; i < (Offset + Size); i++) | |
Checksum += Buffer[i]; | |
return (byte)(0x100 - Checksum); | |
} | |
internal static UInt16 CalculateChecksum16(byte[] Buffer, UInt32 Offset, UInt32 Size) | |
{ | |
UInt16 Checksum = 0; | |
for (UInt32 i = Offset; i < (Offset + Size - 1); i += 2) | |
Checksum += BitConverter.ToUInt16(Buffer, (int)i); | |
return (UInt16)(0x10000 - Checksum); | |
} | |
private static UInt32[] CRC32Table = new UInt32[] { | |
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, | |
0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, | |
0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2, | |
0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, | |
0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, | |
0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172, | |
0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, | |
0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, | |
0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, | |
0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, | |
0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, 0x01DB7106, | |
0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433, | |
0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, | |
0x91646C97, 0xE6635C01, 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, | |
0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, | |
0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, | |
0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, | |
0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0, | |
0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, | |
0xBE0B1010, 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, | |
0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81, | |
0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, | |
0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683, 0xE3630B12, 0x94643B84, | |
0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, | |
0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, | |
0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, | |
0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E, | |
0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, | |
0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, | |
0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, | |
0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, | |
0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, | |
0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F, | |
0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, | |
0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, | |
0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777, | |
0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, | |
0x616BFFD3, 0x166CCF45, 0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2, | |
0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, | |
0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, | |
0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, 0xCDD70693, | |
0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94, | |
0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D | |
}; | |
internal static UInt32 CRC32(byte[] Input, UInt32 Offset, UInt32 Length) | |
{ | |
if ((Input == null) || ((Offset + Length) > Input.Length)) | |
throw new ArgumentException(); | |
unchecked | |
{ | |
uint crc = (uint)(((uint)0) ^ (-1)); | |
for (var i = Offset; i < (Offset + Length); i++) | |
{ | |
crc = (crc >> 8) ^ CRC32Table[(crc ^ Input[i]) & 0xFF]; | |
} | |
crc = (uint)(crc ^ (-1)); | |
if (crc < 0) | |
{ | |
crc += (uint)4294967296; | |
} | |
return crc; | |
} | |
} | |
} | |
} |
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