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* DiscImageChef/Checksums/MD5Context.cs:
* DiscImageChef.Checksums/MD5Context.cs: * DiscImageChef/Checksums/CDChecksums.cs: * DiscImageChef.Checksums/ReedSolomon.cs: * DiscImageChef.Checksums/SHA1Context.cs: * DiscImageChef/Checksums/ReedSolomon.cs: * DiscImageChef/Checksums/SHA1Context.cs: * DiscImageChef.Checksums/CDChecksums.cs: * DiscImageChef/Checksums/CRC64Context.cs: * DiscImageChef/Checksums/CRC32Context.cs: * DiscImageChef/Checksums/CRC16Context.cs: * DiscImageChef.Checksums/CRC64Context.cs: * DiscImageChef.Checksums/CRC32Context.cs: * DiscImageChef.Checksums/CRC16Context.cs: * DiscImageChef/Checksums/SHA256Context.cs: * DiscImageChef.Checksums/SHA512Context.cs: * DiscImageChef.Checksums/SHA384Context.cs: * DiscImageChef/Checksums/SHA384Context.cs: * DiscImageChef/Checksums/SHA512Context.cs: * DiscImageChef.Checksums/SHA256Context.cs: * DiscImageChef.Checksums/Adler32Context.cs: * DiscImageChef/Checksums/SpamSumContext.cs: * DiscImageChef/Checksums/Adler32Context.cs: * DiscImageChef.Checksums/SpamSumContext.cs: * DiscImageChef.Checksums/FletcherContext.cs: * DiscImageChef/Checksums/FletcherContext.cs: * DiscImageChef.Checksums/RIPEMD160Context.cs: * DiscImageChef/Checksums/RIPEMD160Context.cs: * DiscImageChef.Checksums/Properties/AssemblyInfo.cs: * DiscImageChef.Checksums/DiscImageChef.Checksums.csproj: Move checksums to a separate library. * DiscImageChef/Swapping.cs: * DiscImageChef/PrintHex.cs: * DiscImageChef/ArrayFill.cs: * DiscImageChef/DateHandlers.cs: * DiscImageChef/StringHandlers.cs: * DiscImageChef.Helpers/Swapping.cs: * DiscImageChef.Helpers/PrintHex.cs: * DiscImageChef/DiscImageChef.csproj: * DiscImageChef.Helpers/ArrayFill.cs: * DiscImageChef.Helpers/DateHandlers.cs: * DiscImageChef/BigEndianBitConverter.cs: * DiscImageChef.Helpers/StringHandlers.cs: * DiscImageChef/EndianAwareBinaryReader.cs: * DiscImageChef.Helpers/BigEndianBitConverter.cs: * DiscImageChef.Helpers/EndianAwareBinaryReader.cs: * DiscImageChef.Helpers/Properties/AssemblyInfo.cs: * DiscImageChef.Helpers/DiscImageChef.Helpers.csproj: Move helpers to a separate library. * DiscImageChef.sln: Move helpers to a separate library. Move checksums to a separate library.
This commit is contained in:
240
DiscImageChef.Checksums/CRC32Context.cs
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240
DiscImageChef.Checksums/CRC32Context.cs
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/***************************************************************************
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The Disc Image Chef
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----------------------------------------------------------------------------
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Filename : CRC32Context.cs
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Version : 1.0
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Author(s) : Natalia Portillo
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Component : Checksums.
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Revision : $Revision$
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Last change by : $Author$
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Date : $Date$
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--[ Description ] ----------------------------------------------------------
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Implements a CRC32 algorithm.
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--[ License ] --------------------------------------------------------------
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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----------------------------------------------------------------------------
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Copyright (C) 2011-2014 Claunia.com
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****************************************************************************/
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//$Id$
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using System.Text;
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using System.IO;
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using System;
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namespace DiscImageChef.Checksums
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{
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/// <summary>
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/// Provides a UNIX similar API to calculate CRC32.
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/// </summary>
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public class CRC32Context
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{
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const UInt32 crc32Poly = 0xEDB88320;
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const UInt32 crc32Seed = 0xFFFFFFFF;
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UInt32[] table;
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UInt32 hashInt;
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/// <summary>
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/// Initializes the CRC32 table and seed
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/// </summary>
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public void Init()
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{
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hashInt = crc32Seed;
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table = new UInt32[256];
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for (int i = 0; i < 256; i++)
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{
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UInt32 entry = (UInt32)i;
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for (int j = 0; j < 8; j++)
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if ((entry & 1) == 1)
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entry = (entry >> 1) ^ crc32Poly;
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else
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entry = entry >> 1;
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table[i] = entry;
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}
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}
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/// <summary>
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/// Updates the hash with data.
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/// </summary>
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/// <param name="data">Data buffer.</param>
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/// <param name="len">Length of buffer to hash.</param>
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public void Update(byte[] data, uint len)
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{
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for (int i = 0; i < len; i++)
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hashInt = (hashInt >> 8) ^ table[data[i] ^ hashInt & 0xff];
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}
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/// <summary>
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/// Updates the hash with data.
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/// </summary>
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/// <param name="data">Data buffer.</param>
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public void Update(byte[] data)
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{
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Update(data, (uint)data.Length);
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}
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/// <summary>
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/// Returns a byte array of the hash value.
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/// </summary>
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public byte[] Final()
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{
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hashInt ^= crc32Seed;
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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return BigEndianBitConverter.GetBytes(hashInt);
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}
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/// <summary>
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/// Returns a hexadecimal representation of the hash value.
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/// </summary>
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public string End()
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{
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hashInt ^= crc32Seed;
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StringBuilder crc32Output = new StringBuilder();
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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for (int i = 0; i < BigEndianBitConverter.GetBytes(hashInt).Length; i++)
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{
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crc32Output.Append(BigEndianBitConverter.GetBytes(hashInt)[i].ToString("x2"));
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}
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return crc32Output.ToString();
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}
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/// <summary>
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/// Gets the hash of a file
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/// </summary>
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/// <param name="filename">File path.</param>
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public static byte[] File(string filename)
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{
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byte[] hash;
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File(filename, out hash);
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return hash;
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}
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/// <summary>
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/// Gets the hash of a file in hexadecimal and as a byte array.
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/// </summary>
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/// <param name="filename">File path.</param>
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/// <param name="hash">Byte array of the hash value.</param>
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public static string File(string filename, out byte[] hash)
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{
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FileStream fileStream = new FileStream(filename, FileMode.Open);
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UInt32[] localTable;
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UInt32 localhashInt;
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localhashInt = crc32Seed;
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localTable = new UInt32[256];
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for (int i = 0; i < 256; i++)
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{
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UInt32 entry = (UInt32)i;
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for (int j = 0; j < 8; j++)
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if ((entry & 1) == 1)
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entry = (entry >> 1) ^ crc32Poly;
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else
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entry = entry >> 1;
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localTable[i] = entry;
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}
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for (int i = 0; i < fileStream.Length; i++)
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localhashInt = (localhashInt >> 8) ^ localTable[fileStream.ReadByte() ^ localhashInt & 0xff];
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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hash = BitConverter.GetBytes(localhashInt);
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StringBuilder crc32Output = new StringBuilder();
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for (int i = 0; i < hash.Length; i++)
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{
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crc32Output.Append(hash[i].ToString("x2"));
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}
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return crc32Output.ToString();
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}
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/// <summary>
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/// Gets the hash of the specified data buffer.
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/// </summary>
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/// <param name="data">Data buffer.</param>
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/// <param name="len">Length of the data buffer to hash.</param>
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/// <param name="hash">Byte array of the hash value.</param>
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public static string Data(byte[] data, uint len, out byte[] hash)
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{
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return Data(data, len, out hash, crc32Poly, crc32Seed);
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}
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/// <summary>
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/// Gets the hash of the specified data buffer.
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/// </summary>
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/// <param name="data">Data buffer.</param>
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/// <param name="len">Length of the data buffer to hash.</param>
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/// <param name="hash">Byte array of the hash value.</param>
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/// <param name="polynomial">CRC polynomial</param>
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/// <param name="seed">CRC seed</param>
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public static string Data(byte[] data, uint len, out byte[] hash, UInt32 polynomial, UInt32 seed)
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{
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UInt32[] localTable;
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UInt32 localhashInt;
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localhashInt = seed;
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localTable = new UInt32[256];
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for (int i = 0; i < 256; i++)
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{
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UInt32 entry = (UInt32)i;
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for (int j = 0; j < 8; j++)
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if ((entry & 1) == 1)
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entry = (entry >> 1) ^ polynomial;
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else
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entry = entry >> 1;
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localTable[i] = entry;
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}
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for (int i = 0; i < len; i++)
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localhashInt = (localhashInt >> 8) ^ localTable[data[i] ^ localhashInt & 0xff];
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BigEndianBitConverter.IsLittleEndian = BitConverter.IsLittleEndian;
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hash = BitConverter.GetBytes(localhashInt);
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StringBuilder crc32Output = new StringBuilder();
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for (int i = 0; i < hash.Length; i++)
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{
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crc32Output.Append(hash[i].ToString("x2"));
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}
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return crc32Output.ToString();
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}
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/// <summary>
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/// Gets the hash of the specified data buffer.
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/// </summary>
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/// <param name="data">Data buffer.</param>
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/// <param name="hash">Byte array of the hash value.</param>
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public static string Data(byte[] data, out byte[] hash)
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{
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return Data(data, (uint)data.Length, out hash);
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}
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}
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}
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