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General code refactor.

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This commit is contained in:
Natalia Portillo
2021-08-17 21:23:22 +01:00
parent da3cbf28f4
commit 7fdadfa84f
15 changed files with 641 additions and 642 deletions
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32
CRC64Context.cs
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@@ -41,13 +41,9 @@ namespace Aaru.Checksums
/// <summary>Implements a CRC64 algorithm</summary>
public sealed class Crc64Context : IChecksum
{
/// <summary>
/// ECMA CRC64 polynomial
/// </summary>
/// <summary>ECMA CRC64 polynomial</summary>
public const ulong CRC64_ECMA_POLY = 0xC96C5795D7870F42;
/// <summary>
/// ECMA CRC64 seed
/// </summary>
/// <summary>ECMA CRC64 seed</summary>
public const ulong CRC64_ECMA_SEED = 0xFFFFFFFFFFFFFFFF;
readonly ulong _finalSeed;
@@ -69,7 +65,7 @@ namespace Aaru.Checksums
if((entry & 1) == 1)
entry = (entry >> 1) ^ CRC64_ECMA_POLY;
else
entry = entry >> 1;
entry >>= 1;
_table[i] = entry;
}
@@ -92,7 +88,7 @@ namespace Aaru.Checksums
if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial;
else
entry = entry >> 1;
entry >>= 1;
_table[i] = entry;
}
@@ -155,7 +151,7 @@ namespace Aaru.Checksums
{
var fileStream = new FileStream(filename, FileMode.Open);
ulong localhashInt = seed;
ulong localHashInt = seed;
ulong[] localTable = new ulong[256];
@@ -167,16 +163,16 @@ namespace Aaru.Checksums
if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial;
else
entry = entry >> 1;
entry >>= 1;
localTable[i] = entry;
}
for(int i = 0; i < fileStream.Length; i++)
localhashInt = (localhashInt >> 8) ^ localTable[(ulong)fileStream.ReadByte() ^ (localhashInt & 0xffL)];
localHashInt = (localHashInt >> 8) ^ localTable[(ulong)fileStream.ReadByte() ^ (localHashInt & 0xffL)];
localhashInt ^= seed;
hash = BigEndianBitConverter.GetBytes(localhashInt);
localHashInt ^= seed;
hash = BigEndianBitConverter.GetBytes(localHashInt);
var crc64Output = new StringBuilder();
@@ -203,7 +199,7 @@ namespace Aaru.Checksums
/// <param name="seed">CRC seed</param>
public static string Data(byte[] data, uint len, out byte[] hash, ulong polynomial, ulong seed)
{
ulong localhashInt = seed;
ulong localHashInt = seed;
ulong[] localTable = new ulong[256];
@@ -215,16 +211,16 @@ namespace Aaru.Checksums
if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial;
else
entry = entry >> 1;
entry >>= 1;
localTable[i] = entry;
}
for(int i = 0; i < len; i++)
localhashInt = (localhashInt >> 8) ^ localTable[data[i] ^ (localhashInt & 0xff)];
localHashInt = (localHashInt >> 8) ^ localTable[data[i] ^ (localHashInt & 0xff)];
localhashInt ^= seed;
hash = BigEndianBitConverter.GetBytes(localhashInt);
localHashInt ^= seed;
hash = BigEndianBitConverter.GetBytes(localHashInt);
var crc64Output = new StringBuilder();