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Add InputByteOutputTableCodingLoop class.

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Natalia Portillo
2019-02-11 01:41:33 +00:00
parent 537cb0c27e
commit dd58126f37
2 changed files with 55 additions and 0 deletions
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1
Claunia.ReedSolomon/Claunia.ReedSolomon.csproj
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@@ -46,6 +46,7 @@
<Compile Include="Galois.cs" />
<Compile Include="ICodingLoop.cs" />
<Compile Include="InputByteOutputExpCodingLoop.cs" />
<Compile Include="InputByteOutputTableCodingLoop.cs" />
<Compile Include="Matrix.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>

54
Claunia.ReedSolomon/InputByteOutputTableCodingLoop.cs Normal file
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@@ -0,0 +1,54 @@
/**
* One specific ordering/nesting of the coding loops.
*
* Copyright 2015, Backblaze, Inc. All rights reserved.
* Copyright © 2019 Natalia Portillo
*/
namespace Claunia.ReedSolomon
{
public class InputByteOutputTableCodingLoop : CodingLoopBase
{
public override void CodeSomeShards(byte[][] matrixRows, byte[][] inputs, int inputCount, byte[][] outputs,
int outputCount, int offset, int byteCount)
{
byte[][] table = Galois.MULTIPLICATION_TABLE;
{
int iInput = 0;
byte[] inputShard = inputs[iInput];
for(int iByte = offset; iByte < offset + byteCount; iByte++)
{
byte inputByte = inputShard[iByte];
byte[] multTableRow = table[inputByte & 0xFF];
for(int iOutput = 0; iOutput < outputCount; iOutput++)
{
byte[] outputShard = outputs[iOutput];
byte[] matrixRow = matrixRows[iOutput];
outputShard[iByte] = multTableRow[matrixRow[iInput] & 0xFF];
}
}
}
for(int iInput = 1; iInput < inputCount; iInput++)
{
byte[] inputShard = inputs[iInput];
for(int iByte = offset; iByte < offset + byteCount; iByte++)
{
byte inputByte = inputShard[iByte];
byte[] multTableRow = table[inputByte & 0xFF];
for(int iOutput = 0; iOutput < outputCount; iOutput++)
{
byte[] outputShard = outputs[iOutput];
byte[] matrixRow = matrixRows[iOutput];
outputShard[iByte] ^= multTableRow[matrixRow[iInput] & 0xFF];
}
}
}
}
}
}