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Implemented function for inverse code puncturing in M17 protocol

This commit is contained in:
Silvano Seva 2021-10-03 12:09:00 +02:00
parent 990f5e8ce6
commit a9e1e68709
1 changed files with 35 additions and 0 deletions
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35
openrtx/include/protocols/M17/M17CodePuncturing.h
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@ -82,5 +82,40 @@ size_t puncture(const std::array< uint8_t, IN >& input,
return bit_count;
}
/**
* Apply the inverse puncturing scheme to a byte array, thus expanding its bits.
*
* \param input: input byte array, containing puntured data.
* \param output: output byte array, containing depuntured data.
* \param puncture: puncturing matrix, stored as an array of 8 bit values.
* \return number of zero bits added to the input sequence for depunturing.
*/
template < size_t IN, size_t OUT, size_t P >
size_t depuncture(const std::array< uint8_t, IN >& input,
std::array< uint8_t, OUT >& output,
const std::array< uint8_t, P >& puncture)
{
size_t inpIndex = 0;
size_t punctIndex = 0;
size_t bit_count = 0;
for(size_t i = 0; i < 8*OUT && inpIndex < 8*IN; i++)
{
if(puncture[punctIndex++])
{
setBit(output, i, getBit(input, inpIndex++));
}
else
{
setBit(output, i, 0);
bit_count++;
}
if(punctIndex == P) punctIndex = 0;
}
return bit_count;
}
#endif /* M17_CODE_PUNCTURING_H */