public void TestDecodeFixedDualBasis()
{
// Make a test block to test with.
// We need to copy goodBlock because we'll be corrupting it a little.
//
Span <byte> testBlock = stackalloc byte[Rs8.BlockLength];
goodBlock.Span.CopyTo(testBlock);
// A mask containing 16 errors
//
Span <byte> errorMask = stackalloc byte[Rs8.BlockLength] {
0x58, 0x00, 0xA3, 0x00, 0x00, 0xCD, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0xCA, 0x96, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x1B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xA2, 0x00, 0xAC, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0xB9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xE5, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x94, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xC3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x29, 0x00, 0x00, 0x00, 0x00,
};
// Apply the error mask to the test block
//
for (int i = 0; i < testBlock.Length; i++)
{
testBlock[i] ^= errorMask[i];
}
// Decode the test block to correct errors
//
int correctedByteCount = Rs8.Decode(testBlock, null, true);
// Check that the corrected byte count actually matches the number of errors
//
Assert.Equal(16, correctedByteCount);
// Check that the decoded test block matches the correct encoded block.
//
// TODO: Use Span<T> overload of Assert.Equal when it is added to XUnit
Assert.Equal(goodBlock.ToArray(), testBlock.ToArray());
}
public void TestEncodeFixedDualBasis()
{
// Create test block with data, but no parity.
//
Span <byte> testBlock = stackalloc byte[Rs8.BlockLength];
goodBlock.Span.Slice(0, Rs8.DataLength).CopyTo(testBlock);
// Encode the test block to add parity
//
Rs8.Encode(testBlock, true);
// Ensure the encoded output matches the expected output
//
// TODO: Use Span<T> overload of Assert.Equal when it is added to XUnit
Assert.Equal(goodBlock.ToArray(), testBlock.ToArray());
}
public static FecDecodeResult DecodePayload(Span <byte> inputPayload, int preambleLength, int virtualFillLength, bool dualBasis)
{
FecDecodeResult result = new FecDecodeResult
{
PreambleLength = preambleLength,
VirtualFillLength = virtualFillLength,
DualBasis = dualBasis,
PayloadUncorrected = inputPayload.ToArray()
};
if (preambleLength < 0)
{
result.Success = false;
result.Error = $"Preamble count {preambleLength} was less than 0";
return(result);
}
if (virtualFillLength < 0)
{
result.Success = false;
result.Error = $"Virtual fill count {virtualFillLength} was less than 0";
return(result);
}
int inputBlockLengthCalculated = inputPayload.Length - preambleLength + virtualFillLength;
if (inputBlockLengthCalculated != Rs8.BlockLength)
{
result.Success = false;
result.Error = $"Payload ({inputPayload.Length}) - Preamble ({preambleLength}) + Virtual fill ({virtualFillLength}) must equal block length ({inputBlockLengthCalculated} != {Rs8.BlockLength})";
return(result);
}
// Remove preamble from decode
//
Span <byte> inputAfterPreamble = inputPayload.Slice(preambleLength);
Span <byte> mainBlock = stackalloc byte[Rs8.BlockLength];
Span <byte> mainBlockData = mainBlock.Slice(virtualFillLength);
// Copy the input data after the preamble to the post-virtual-fill region of the data block
//
inputAfterPreamble.CopyTo(mainBlockData);
// Save state before decode
//
result.BlockUncorrected = mainBlock.ToArray();
// Decode the block
//
result.ErrorsCorrectedCount = Rs8.Decode(mainBlock, null, dualBasis);
// Copy the decoded data back after the original preamble
//
mainBlockData.CopyTo(inputAfterPreamble);
// Save decoded state
//
result.PayloadCorrected = inputPayload.ToArray();
result.BlockCorrected = mainBlock.ToArray();
if (result.ErrorsCorrectedCount < 0)
{
result.Success = false;
result.Error = "Too many errors in payload to correct (errors > 16)";
return(result);
}
else
{
result.Success = true;
return(result);
}
}
public void TestDecodeFixedSpeedProfile()
{
// An encoded test block with 16 bad bytes
//
Span <byte> testBlock = stackalloc byte[Rs8.BlockLength] {
0x58, 0x01, 0xa1, 0x03, 0x04, 0xc8, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x03, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
0x30, 0x31, 0xf8, 0xa5, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
0x4b, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0xfb, 0x5a, 0xf7, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 0x61, 0x62, 0x63, 0xdd, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x74, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
0x24, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0x7a, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0x41, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0x2f,
0xbd, 0x4f, 0xb4, 0x74, 0x84, 0x94, 0xb9, 0xd6, 0xd5, 0x54, 0x62, 0x72, 0x12, 0xee, 0xb3, 0xeb,
0xed, 0x41, 0x19, 0x1d, 0xe1, 0xd3, 0x63, 0x20, 0xea, 0x49, 0x00, 0x0b, 0x25, 0xab, 0xcf
};
Span <byte> testBlockTemp = stackalloc byte[Rs8.BlockLength];
Stopwatch sw = new Stopwatch();
int iterations = 10000;
int correctedByteCount = 0;
for (int i = 0; i < iterations; i++)
{
testBlock.CopyTo(testBlockTemp);
sw.Start();
// Decode the test block to correct errors
//
correctedByteCount = Rs8.Decode(testBlockTemp, null);
sw.Stop();
}
output.WriteLine($"Completed {iterations} decoder iterations, {sw.Elapsed} elapsed.");
Span <byte> correctBlock = stackalloc byte[Rs8.BlockLength] {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0x2f,
0xbd, 0x4f, 0xb4, 0x74, 0x84, 0x94, 0xb9, 0xac, 0xd5, 0x54, 0x62, 0x72, 0x12, 0xee, 0xb3, 0xeb,
0xed, 0x41, 0x19, 0x1d, 0xe1, 0xd3, 0x63, 0x20, 0xea, 0x49, 0x29, 0x0b, 0x25, 0xab, 0xcf
};
// Check that the corrected byte count actually matches the number of errors
//
Assert.Equal(16, correctedByteCount);
// Check that the decoded test block matches the correct encoded block.
//
Assert.Equal(correctBlock.ToArray(), testBlockTemp.ToArray());
}
public void TestEncodeFixedSpeedProfile()
{
// A test block with data, but no parity.
//
Span <byte> testBlock = stackalloc byte[Rs8.BlockLength] {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
Stopwatch sw = new Stopwatch();
// Decode the test block to correct errors
//
int iterations = 1000;
sw.Start();
for (int i = 0; i < iterations; i++)
{
// Encode the test block to add parity
//
Rs8.Encode(testBlock);
}
sw.Stop();
output.WriteLine($"Completed {iterations} encoder iterations, {sw.Elapsed} elapsed.");
// The expected output from a known working encoder
//
Span <byte> correctBlock = stackalloc byte[Rs8.BlockLength] {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0x2f,
0xbd, 0x4f, 0xb4, 0x74, 0x84, 0x94, 0xb9, 0xac, 0xd5, 0x54, 0x62, 0x72, 0x12, 0xee, 0xb3, 0xeb,
0xed, 0x41, 0x19, 0x1d, 0xe1, 0xd3, 0x63, 0x20, 0xea, 0x49, 0x29, 0x0b, 0x25, 0xab, 0xcf
};
// Ensure the encoded output matches the expected output
//
Assert.True(correctBlock.SequenceEqual(testBlock));
}
private void DoTest(double corruptChance)
{
Span <byte> testPayload = stackalloc byte[Rs8.BlockLength];
Span <byte> corruptPayload = stackalloc byte[Rs8.BlockLength];
// Generate random data using the corrupt method at 100%
//
CorruptSpan(testPayload.Slice(0, Rs8.DataLength), 1, random);
output.WriteLine("Test data:");
output.WriteLine(FormatSpan(testPayload));
// Calculate parity with encode
//
Rs8.Encode(testPayload.Slice(0, Rs8.DataLength), testPayload.Slice(Rs8.DataLength, Rs8.ParityLength));
output.WriteLine("Encoded block:");
output.WriteLine(FormatSpan(testPayload));
// Copy the test payload
//
testPayload.CopyTo(corruptPayload);
// Corrupt the corrupt payload
//
CorruptSpan(corruptPayload, corruptChance, random);
// Count how many bytes were actually corrupted
//
int corruptedByteCount = CompareSpans(testPayload, corruptPayload);
output.WriteLine($"Corrupted block ({corruptedByteCount} bytes corrupted):");
output.WriteLine(FormatSpan(corruptPayload));
// Correct the corrupted array with decode
//
int correctedByteCount = Rs8.Decode(corruptPayload, null);
// Check if there were any differences between the original
// block and the corrected block
//
int corruptedByteCountAfterDecode = CompareSpans(testPayload, corruptPayload);
output.WriteLine($"Corrected block ({correctedByteCount} bytes corrected, {corruptedByteCountAfterDecode} errors remain):");
output.WriteLine(FormatSpan(corruptPayload));
if (correctedByteCount < 0)
{
// Decode failed. This is expected if there were too many errors.
// Check that errors were excessive.
//
Assert.True(corruptedByteCount > Rs8.ParityLength / 2);
}
else
{
// The decoder appears to have succeeded.
// Ensure that the reported corrected bytes count
// matches the number actually corrupted.
//
Assert.Equal(corruptedByteCount, correctedByteCount);
// Verify that the block now matches the uncorrupted block
//
Assert.Equal(0, corruptedByteCountAfterDecode);
}
}
public static int Main(string[] args)
{
bool encode = false;
bool decode = false;
bool verbose = false;
bool veryVerbose = false;
bool printInput = false;
bool dualBasis = false;
bool textMode = false;
bool continuousMode = false;
int padding = 0;
int ignorePreambleCount = 0;
string inputFilePath = null;
string outputFilePath = null;
// Parse args
//
if (args.Length > 0)
{
if (args.Contains("-h") || args.Contains("--help"))
{
PrintUsage();
return((int)ReturnCodes.ExOk);
}
verbose = args.Any(s => s.StartsWith("-v")) || args.Any(s => s.StartsWith("--verbose"));
veryVerbose = args.Any(s => s.StartsWith("-vv")) || args.Any(s => s.StartsWith("--veryverbose"));
if (args.Contains("-t"))
{
// Treat STDIN and STDOUT as hex encoded text streams.
textMode = true;
}
else if (args.Contains("-b"))
{
// Treat STDIN and STDOUT as binary streams.
//
textMode = false;
}
if (args.Contains("-x"))
{
dualBasis = true;
}
if (args.Contains("-c"))
{
continuousMode = true;
}
if (args.Contains("-p"))
{
printInput = true;
}
// Get padding length
//
string paddingString = inputFilePath = args.SkipWhile(s => s != "-i").ElementAtOrDefault(1);
if (paddingString != null)
{
if (!int.TryParse(paddingString, out padding))
{
Console.Error.WriteLine("Invalid padding length");
return((int)ReturnCodes.ExUsage);
}
}
// Get preamble ignore length
//
string ignorePreambleCountString = args.SkipWhile(s => s != "-n").ElementAtOrDefault(1);
if (ignorePreambleCountString != null)
{
if (!int.TryParse(ignorePreambleCountString, out ignorePreambleCount))
{
Console.Error.WriteLine("Invalid ignore preamble count");
return((int)ReturnCodes.ExUsage);
}
}
// Get input file path
//
inputFilePath = args.SkipWhile(s => s != "-i").ElementAtOrDefault(1);
if (inputFilePath == "-")
{
inputFilePath = null;
}
// Get output file path
//
outputFilePath = args.SkipWhile(s => s != "-o").ElementAtOrDefault(1);
if (outputFilePath == "-")
{
outputFilePath = null;
}
encode = args.Contains("-e");
decode = args.Contains("-d");
if (encode && decode)
{
Console.Error.WriteLine("Cannot specify both encode and decode");
return((int)ReturnCodes.ExUsage);
}
else if (!encode && !decode)
{
Console.Error.WriteLine("Must specify encode or decode");
return((int)ReturnCodes.ExUsage);
}
}
using (Stream inputStream = GetInputStream(inputFilePath))
{
using (Stream outputStream = GetOutputStream(outputFilePath))
{
do
{
// Read preamble off the input stream
//
if (ignorePreambleCount > 0)
{
if (verbose)
{
Console.Error.WriteLine($"Ignoring {ignorePreambleCount} bytes {(textMode ? "in hex text" : "in byte stream")}");
}
ReadDummyInput(ignorePreambleCount, inputStream, textMode, veryVerbose);
}
if (encode)
{
if (verbose)
{
Console.Error.WriteLine($"Waiting for {Rs8.DataLength} bytes {(textMode ? "in hex text" : "in byte stream")}");
}
// Alloc the block on the stack
//
Span <byte> block = stackalloc byte[Rs8.BlockLength];
// Read in data
//
try
{
ReadToSpan(block.Slice(0, Rs8.DataLength), inputStream, textMode, veryVerbose);
}
catch (Exception ex)
{
Console.Error.WriteLine($"Error reading from {inputFilePath ?? "stdin"}: {ex.Message}");
return((int)ReturnCodes.ExIoErr);
}
if (printInput)
{
if (verbose)
{
Console.Error.WriteLine("Input parsed:");
}
WriteFromSpan(block, outputStream, textMode);
}
if (verbose)
{
Console.Error.WriteLine("Encoding ...");
}
// Encode the block
//
Rs8.Encode(block, dualBasis);
if (verbose)
{
Console.Error.WriteLine("Encoded.");
}
// Write output
//
try
{
WriteFromSpan(block, outputStream, textMode);
}
catch (Exception ex)
{
Console.Error.WriteLine($"Error writing to {outputFilePath ?? "stdout"}: {ex.Message}");
return((int)ReturnCodes.ExCantCreate);
}
}
else if (decode)
{
if (verbose)
{
Console.Error.WriteLine($"Waiting for {Rs8.BlockLength} bytes {(textMode ? "in hex text" : "in byte stream")}");
}
// Alloc the block on the stack
//
Span <byte> block = stackalloc byte[Rs8.BlockLength];
// Read in data
//
try
{
ReadToSpan(block, inputStream, textMode, veryVerbose);
}
catch (Exception ex)
{
Console.Error.WriteLine($"Error reading from {outputFilePath ?? "stdin"}: {ex.Message}");
return((int)ReturnCodes.ExIoErr);
}
if (printInput)
{
if (verbose)
{
Console.Error.WriteLine("Input parsed:");
}
WriteFromSpan(block, outputStream, textMode);
}
if (verbose)
{
Console.Error.WriteLine("Decoding ...");
}
// Decode the block, correcting errors.
//
int bytesCorrected = Rs8.Decode(block, null, dualBasis);
// Check if the block was successfully recovered
//
if (bytesCorrected >= 0)
{
Console.Error.WriteLine($"Decoded. {bytesCorrected} errors corrected.");
}
else
{
Console.Error.WriteLine($"Unrecoverable, errors >{Rs8.ParityLength / 2}.");
}
// Write output
//
try
{
WriteFromSpan(block, outputStream, textMode);
}
catch (Exception ex)
{
Console.Error.WriteLine($"Error writing to {outputFilePath ?? "stdout"}: {ex.Message}");
return((int)ReturnCodes.ExCantCreate);
}
}
else
{
throw new InvalidOperationException();
}
}while (continuousMode);
return((int)ReturnCodes.ExOk);
}
}
}
