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Finally process the Golay(24,12,8) parity bit.

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This commit is contained in:
Jonathan Naylor
2021-03-27 20:00:53 +00:00
parent 4422444179
commit 6ac672e106
8 changed files with 63 additions and 67 deletions
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24
Golay24128.cpp
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@@ -1,9 +1,10 @@
/*
* Copyright (C) 2010,2016 by Jonathan Naylor G4KLX
* Copyright (C) 2010,2016,2021 by Jonathan Naylor G4KLX
* Copyright (C) 2002 by Robert H. Morelos-Zaragoza. All rights reserved.
*/
#include "Golay24128.h"
#include "Utils.h"
#include <cstdio>
#include <cassert>
@@ -1089,20 +1090,23 @@ unsigned int CGolay24128::decode23127(unsigned int code)
return code >> 11;
}
unsigned int CGolay24128::decode24128(unsigned int code)
unsigned int CGolay24128::decode24128(unsigned int input, bool& valid)
{
return decode23127(code >> 1);
unsigned int syndrome = ::get_syndrome_23127(input >> 1);
unsigned int error_pattern = DECODING_TABLE_23127[syndrome] << 1;
unsigned int output = input ^ error_pattern;
valid = (CUtils::countBits(syndrome) < 3U) || !(CUtils::countBits(output) & 1);
return output >> 12;
}
unsigned int CGolay24128::decode24128(unsigned char* bytes)
unsigned int CGolay24128::decode24128(unsigned char* bytes, bool& valid)
{
assert(bytes != NULL);
unsigned int code = bytes[0U];
code <<= 8;
code |= bytes[1U];
code <<= 8;
code |= bytes[2U];
unsigned int code = (bytes[0U] << 16) | (bytes[1U] << 8) | (bytes[2U] << 0);
return decode23127(code >> 1);
return decode24128(code, valid);
}