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[Aaru.Checksums] Reformat and cleanup.

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This commit is contained in:
Natalia Portillo
2023-10-03 22:45:06 +01:00
parent 03a488e834
commit 3429b9012b
28 changed files with 2656 additions and 2416 deletions
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18
CRC64Context.cs
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@@ -312,6 +312,8 @@ public sealed class Crc64Context : IChecksum
_table = GenerateTable(polynomial);
}
#region IChecksum Members
/// <inheritdoc />
/// <summary>Updates the hash with data.</summary>
/// <param name="data">Data buffer.</param>
@@ -360,6 +362,8 @@ public sealed class Crc64Context : IChecksum
return crc64Output.ToString();
}
#endregion
[DllImport("libAaru.Checksums.Native", SetLastError = true)]
static extern IntPtr crc64_init();
@@ -384,23 +388,25 @@ public sealed class Crc64Context : IChecksum
var entry = (ulong)i;
for(var j = 0; j < 8; j++)
{
if((entry & 1) == 1)
entry = (entry >> 1) ^ polynomial;
entry = entry >> 1 ^ polynomial;
else
entry >>= 1;
}
table[0][i] = entry;
}
for(var slice = 1; slice < 4; slice++)
for(var i = 0; i < 256; i++)
table[slice][i] = (table[slice - 1][i] >> 8) ^ table[0][table[slice - 1][i] & 0xFF];
for(var i = 0; i < 256; i++)
table[slice][i] = table[slice - 1][i] >> 8 ^ table[0][table[slice - 1][i] & 0xFF];
return table;
}
static void Step(ref ulong previousCrc, ulong[][] table, byte[] data, uint len, bool useEcma, bool useNative,
IntPtr nativeContext)
IntPtr nativeContext)
{
if(useNative && useEcma)
{
@@ -448,13 +454,13 @@ public sealed class Crc64Context : IChecksum
var tmp = (uint)(crc ^ BitConverter.ToUInt32(data, dataOff));
dataOff += 4;
crc = table[3][tmp & 0xFF] ^ table[2][(tmp >> 8) & 0xFF] ^ (crc >> 32) ^ table[1][(tmp >> 16) & 0xFF] ^
crc = table[3][tmp & 0xFF] ^ table[2][tmp >> 8 & 0xFF] ^ crc >> 32 ^ table[1][tmp >> 16 & 0xFF] ^
table[0][tmp >> 24];
}
}
while(len-- != 0)
crc = table[0][data[dataOff++] ^ (crc & 0xFF)] ^ (crc >> 8);
crc = table[0][data[dataOff++] ^ crc & 0xFF] ^ crc >> 8;
previousCrc = crc;
}