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Full code refactor and clean-up.
This commit is contained in:
@@ -35,199 +35,202 @@ using System.Text;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Helpers;
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namespace Aaru.Checksums
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namespace Aaru.Checksums;
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/// <summary>Implements a CRC32 algorithm</summary>
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public sealed class Crc32Context : IChecksum
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{
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/// <summary>Implements a CRC32 algorithm</summary>
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public sealed class Crc32Context : IChecksum
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const uint CRC32_ISO_POLY = 0xEDB88320;
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const uint CRC32_ISO_SEED = 0xFFFFFFFF;
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readonly uint _finalSeed;
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readonly uint[] _table;
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uint _hashInt;
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/// <summary>Initializes the CRC32 table and seed as CRC32-ISO</summary>
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public Crc32Context()
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{
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const uint CRC32_ISO_POLY = 0xEDB88320;
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const uint CRC32_ISO_SEED = 0xFFFFFFFF;
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_hashInt = CRC32_ISO_SEED;
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_finalSeed = CRC32_ISO_SEED;
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readonly uint _finalSeed;
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readonly uint[] _table;
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uint _hashInt;
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_table = new uint[256];
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/// <summary>Initializes the CRC32 table and seed as CRC32-ISO</summary>
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public Crc32Context()
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for(var i = 0; i < 256; i++)
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{
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_hashInt = CRC32_ISO_SEED;
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_finalSeed = CRC32_ISO_SEED;
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var entry = (uint)i;
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_table = new uint[256];
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for(int i = 0; i < 256; i++)
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for(var j = 0; j < 8; j++)
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{
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uint entry = (uint)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) ^ CRC32_ISO_POLY;
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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>Initializes the CRC32 table with a custom polynomial and seed</summary>
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public Crc32Context(uint polynomial, uint seed)
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{
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_hashInt = seed;
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_finalSeed = seed;
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_table = new uint[256];
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for(int i = 0; i < 256; i++)
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{
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uint entry = (uint)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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_table[i] = entry;
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}
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}
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/// <inheritdoc />
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/// <summary>Updates the hash with data.</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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/// <inheritdoc />
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/// <summary>Updates the hash with data.</summary>
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/// <param name="data">Data buffer.</param>
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public void Update(byte[] data) => Update(data, (uint)data.Length);
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/// <inheritdoc />
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/// <summary>Returns a byte array of the hash value.</summary>
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public byte[] Final() => BigEndianBitConverter.GetBytes(_hashInt ^ _finalSeed);
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/// <inheritdoc />
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/// <summary>Returns a hexadecimal representation of the hash value.</summary>
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public string End()
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{
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var crc32Output = new StringBuilder();
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for(int i = 0; i < BigEndianBitConverter.GetBytes(_hashInt ^ _finalSeed).Length; i++)
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crc32Output.Append(BigEndianBitConverter.GetBytes(_hashInt ^ _finalSeed)[i].ToString("x2"));
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return crc32Output.ToString();
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}
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/// <summary>Gets the hash of a file</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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File(filename, out byte[] hash);
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return hash;
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}
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/// <summary>Gets the hash of a file in hexadecimal and as a byte array.</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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File(filename, out hash, CRC32_ISO_POLY, CRC32_ISO_SEED);
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/// <summary>Gets the hash of a file in hexadecimal and as a byte array.</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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/// <param name="polynomial">CRC polynomial</param>
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/// <param name="seed">CRC seed</param>
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public static string File(string filename, out byte[] hash, uint polynomial, uint seed)
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{
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var fileStream = new FileStream(filename, FileMode.Open, FileAccess.Read);
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uint localhashInt = seed;
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uint[] localTable = new uint[256];
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for(int i = 0; i < 256; i++)
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{
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uint entry = (uint)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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if((entry & 1) == 1)
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entry = entry >> 1 ^ CRC32_ISO_POLY;
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else
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entry = entry >> 1;
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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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localhashInt ^= seed;
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hash = BigEndianBitConverter.GetBytes(localhashInt);
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var crc32Output = new StringBuilder();
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foreach(byte h in hash)
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crc32Output.Append(h.ToString("x2"));
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fileStream.Close();
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return crc32Output.ToString();
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_table[i] = entry;
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}
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/// <summary>Gets the hash of the specified data buffer.</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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Data(data, len, out hash, CRC32_ISO_POLY, CRC32_ISO_SEED);
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/// <summary>Gets the hash of the specified data buffer.</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, uint polynomial, uint seed)
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{
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uint localhashInt = seed;
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uint[] localTable = new uint[256];
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for(int i = 0; i < 256; i++)
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{
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uint entry = (uint)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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localhashInt ^= seed;
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hash = BigEndianBitConverter.GetBytes(localhashInt);
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var crc32Output = new StringBuilder();
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foreach(byte h in hash)
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crc32Output.Append(h.ToString("x2"));
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return crc32Output.ToString();
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}
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/// <summary>Gets the hash of the specified data buffer.</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) => Data(data, (uint)data.Length, out hash);
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}
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/// <summary>Initializes the CRC32 table with a custom polynomial and seed</summary>
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public Crc32Context(uint polynomial, uint seed)
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{
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_hashInt = seed;
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_finalSeed = seed;
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_table = new uint[256];
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for(var i = 0; i < 256; i++)
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{
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var entry = (uint)i;
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for(var j = 0; j < 8; j++)
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{
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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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}
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_table[i] = entry;
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}
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}
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/// <inheritdoc />
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/// <summary>Updates the hash with data.</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(var i = 0; i < len; i++) _hashInt = _hashInt >> 8 ^ _table[data[i] ^ _hashInt & 0xff];
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}
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/// <inheritdoc />
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/// <summary>Updates the hash with data.</summary>
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/// <param name="data">Data buffer.</param>
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public void Update(byte[] data) => Update(data, (uint)data.Length);
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/// <inheritdoc />
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/// <summary>Returns a byte array of the hash value.</summary>
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public byte[] Final() => BigEndianBitConverter.GetBytes(_hashInt ^ _finalSeed);
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/// <inheritdoc />
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/// <summary>Returns a hexadecimal representation of the hash value.</summary>
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public string End()
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{
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var crc32Output = new StringBuilder();
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for(var i = 0; i < BigEndianBitConverter.GetBytes(_hashInt ^ _finalSeed).Length; i++)
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crc32Output.Append(BigEndianBitConverter.GetBytes(_hashInt ^ _finalSeed)[i].ToString("x2"));
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return crc32Output.ToString();
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}
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/// <summary>Gets the hash of a file</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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File(filename, out byte[] hash);
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return hash;
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}
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/// <summary>Gets the hash of a file in hexadecimal and as a byte array.</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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File(filename, out hash, CRC32_ISO_POLY, CRC32_ISO_SEED);
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/// <summary>Gets the hash of a file in hexadecimal and as a byte array.</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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/// <param name="polynomial">CRC polynomial</param>
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/// <param name="seed">CRC seed</param>
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public static string File(string filename, out byte[] hash, uint polynomial, uint seed)
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{
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var fileStream = new FileStream(filename, FileMode.Open, FileAccess.Read);
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uint localhashInt = seed;
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var localTable = new uint[256];
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for(var i = 0; i < 256; i++)
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{
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var entry = (uint)i;
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for(var j = 0; j < 8; j++)
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{
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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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}
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localTable[i] = entry;
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}
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for(var i = 0; i < fileStream.Length; i++)
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localhashInt = localhashInt >> 8 ^ localTable[fileStream.ReadByte() ^ localhashInt & 0xff];
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localhashInt ^= seed;
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hash = BigEndianBitConverter.GetBytes(localhashInt);
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var crc32Output = new StringBuilder();
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foreach(byte h in hash) crc32Output.Append(h.ToString("x2"));
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fileStream.Close();
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return crc32Output.ToString();
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}
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/// <summary>Gets the hash of the specified data buffer.</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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Data(data, len, out hash, CRC32_ISO_POLY, CRC32_ISO_SEED);
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/// <summary>Gets the hash of the specified data buffer.</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, uint polynomial, uint seed)
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{
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uint localhashInt = seed;
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var localTable = new uint[256];
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for(var i = 0; i < 256; i++)
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{
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var entry = (uint)i;
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for(var j = 0; j < 8; j++)
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{
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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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}
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localTable[i] = entry;
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}
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for(var i = 0; i < len; i++) localhashInt = localhashInt >> 8 ^ localTable[data[i] ^ localhashInt & 0xff];
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localhashInt ^= seed;
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hash = BigEndianBitConverter.GetBytes(localhashInt);
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var crc32Output = new StringBuilder();
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foreach(byte h in hash) crc32Output.Append(h.ToString("x2"));
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return crc32Output.ToString();
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}
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/// <summary>Gets the hash of the specified data buffer.</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) => Data(data, (uint)data.Length, out hash);
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}
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