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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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44
CRC16Context.cs
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@@ -83,6 +83,8 @@ public class Crc16Context : IChecksum
_table = table ?? GenerateTable(polynomial, inverse);
}
#region IChecksum Members
/// <inheritdoc />
/// <summary>Updates the hash with data.</summary>
/// <param name="data">Data buffer.</param>
@@ -186,6 +188,8 @@ public class Crc16Context : IChecksum
return crc16Output.ToString();
}
#endregion
[DllImport("libAaru.Checksums.Native", SetLastError = true)]
static extern IntPtr crc16_init();
@@ -234,16 +238,16 @@ public class Crc16Context : IChecksum
var two = BitConverter.ToUInt32(data, currentPos);
currentPos += 4;
crc = (ushort)(table[0][(two >> 24) & 0xFF] ^ table[1][(two >> 16) & 0xFF] ^
table[2][(two >> 8) & 0xFF] ^ table[3][two & 0xFF] ^ table[4][(one >> 24) & 0xFF] ^
table[5][(one >> 16) & 0xFF] ^ table[6][(one >> 8) & 0xFF] ^ table[7][one & 0xFF]);
crc = (ushort)(table[0][two >> 24 & 0xFF] ^ table[1][two >> 16 & 0xFF] ^
table[2][two >> 8 & 0xFF] ^ table[3][two & 0xFF] ^ table[4][one >> 24 & 0xFF] ^
table[5][one >> 16 & 0xFF] ^ table[6][one >> 8 & 0xFF] ^ table[7][one & 0xFF]);
}
len -= bytesAtOnce;
}
while(len-- != 0)
crc = (ushort)((crc >> 8) ^ table[0][(crc & 0xFF) ^ data[currentPos++]]);
crc = (ushort)(crc >> 8 ^ table[0][crc & 0xFF ^ data[currentPos++]]);
previousCrc = crc;
}
@@ -266,8 +270,8 @@ public class Crc16Context : IChecksum
for(unrolling = 0; unrolling < unroll; unrolling++)
{
crc = (ushort)(table[7][data[currentPos + 0] ^ (crc >> 8)] ^
table[6][data[currentPos + 1] ^ (crc & 0xFF)] ^ table[5][data[currentPos + 2]] ^
crc = (ushort)(table[7][data[currentPos + 0] ^ crc >> 8] ^
table[6][data[currentPos + 1] ^ crc & 0xFF] ^ table[5][data[currentPos + 2]] ^
table[4][data[currentPos + 3]] ^ table[3][data[currentPos + 4]] ^
table[2][data[currentPos + 5]] ^ table[1][data[currentPos + 6]] ^
table[0][data[currentPos + 7]]);
@@ -279,7 +283,7 @@ public class Crc16Context : IChecksum
}
while(len-- != 0)
crc = (ushort)((crc << 8) ^ table[0][(crc >> 8) ^ data[currentPos++]]);
crc = (ushort)(crc << 8 ^ table[0][crc >> 8 ^ data[currentPos++]]);
previousCrc = crc;
}
@@ -292,19 +296,24 @@ public class Crc16Context : IChecksum
table[i] = new ushort[256];
if(!inverseTable)
{
for(uint i = 0; i < 256; i++)
{
uint entry = 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] = (ushort)entry;
}
}
else
{
for(uint i = 0; i < 256; i++)
{
uint entry = i << 8;
@@ -312,20 +321,23 @@ public class Crc16Context : IChecksum
for(uint j = 0; j < 8; j++)
{
if((entry & 0x8000) > 0)
entry = (entry << 1) ^ polynomial;
entry = entry << 1 ^ polynomial;
else
entry <<= 1;
table[0][i] = (ushort)entry;
}
}
}
for(var slice = 1; slice < 8; slice++)
for(var i = 0; i < 256; i++)
if(inverseTable)
table[slice][i] = (ushort)((table[slice - 1][i] << 8) ^ table[0][table[slice - 1][i] >> 8]);
else
table[slice][i] = (ushort)((table[slice - 1][i] >> 8) ^ table[0][table[slice - 1][i] & 0xFF]);
for(var i = 0; i < 256; i++)
{
if(inverseTable)
table[slice][i] = (ushort)(table[slice - 1][i] << 8 ^ table[0][table[slice - 1][i] >> 8]);
else
table[slice][i] = (ushort)(table[slice - 1][i] >> 8 ^ table[0][table[slice - 1][i] & 0xFF]);
}
return table;
}
@@ -338,7 +350,7 @@ public class Crc16Context : IChecksum
/// <param name="table">CRC lookup table</param>
/// <param name="inverse">Is CRC inverted?</param>
public static string File(string filename, out byte[] hash, ushort polynomial, ushort seed, ushort[][] table,
bool inverse)
bool inverse)
{
bool useNative = Native.IsSupported;
@@ -443,7 +455,7 @@ public class Crc16Context : IChecksum
/// <param name="table">CRC lookup table</param>
/// <param name="inverse">Is CRC inverted?</param>
public static string Data(byte[] data, uint len, out byte[] hash, ushort polynomial, ushort seed, ushort[][] table,
bool inverse)
bool inverse)
{
bool useNative = Native.IsSupported;