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Add the P25 NID BCH encoder.

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This commit is contained in:
Jonathan Naylor
2016-09-19 21:41:34 +01:00
parent 16ec0db6d8
commit 3567d83349
13 changed files with 255 additions and 16 deletions
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57
P25NID.cpp
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@@ -19,21 +19,68 @@
#include "P25NID.h"
#include "P25Defines.h"
#include "P25Utils.h"
#include "BCH.h"
#include <cstdio>
#include <cassert>
CP25NID::CP25NID() :
CP25NID::CP25NID(unsigned int nac) :
m_duid(0U),
m_nac(0U)
m_nac(0U),
m_hdr(NULL),
m_ldu1(NULL),
m_ldu2(NULL),
m_termlc(NULL),
m_term(NULL)
{
CBCH bch;
m_hdr = new unsigned char[P25_NID_LENGTH_BYTES];
m_hdr[0U] = (nac >> 4) & 0xFFU;
m_hdr[1U] = (nac << 4) & 0xF0U;
m_hdr[1U] |= P25_DUID_HEADER;
bch.encode(m_hdr);
m_hdr[7U] &= 0xFEU; // Clear the parity bit
m_ldu1 = new unsigned char[P25_NID_LENGTH_BYTES];
m_ldu1[0U] = (nac >> 4) & 0xFFU;
m_ldu1[1U] = (nac << 4) & 0xF0U;
m_ldu1[1U] |= P25_DUID_LDU1;
bch.encode(m_ldu1);
m_ldu1[7U] |= 0x01U; // Set the parity bit
m_ldu2 = new unsigned char[P25_NID_LENGTH_BYTES];
m_ldu2[0U] = (nac >> 4) & 0xFFU;
m_ldu2[1U] = (nac << 4) & 0xF0U;
m_ldu2[1U] |= P25_DUID_LDU2;
bch.encode(m_ldu2);
m_ldu2[7U] |= 0x01U; // Set the parity bit
m_termlc = new unsigned char[P25_NID_LENGTH_BYTES];
m_termlc[0U] = (nac >> 4) & 0xFFU;
m_termlc[1U] = (nac << 4) & 0xF0U;
m_termlc[1U] |= P25_DUID_TERM_LC;
bch.encode(m_termlc);
m_termlc[7U] &= 0xFEU; // Clear the parity bit
m_term = new unsigned char[P25_NID_LENGTH_BYTES];
m_term[0U] = (nac >> 4) & 0xFFU;
m_term[1U] = (nac << 4) & 0xF0U;
m_term[1U] |= P25_DUID_TERM;
bch.encode(m_term);
m_term[7U] &= 0xFEU; // Clear the parity bit
}
CP25NID::~CP25NID()
{
delete[] m_hdr;
delete[] m_ldu1;
delete[] m_ldu2;
delete[] m_termlc;
delete[] m_term;
}
void CP25NID::process(unsigned char* data)
bool CP25NID::process(unsigned char* data)
{
assert(data != NULL);
@@ -41,14 +88,14 @@ void CP25NID::process(unsigned char* data)
CP25Utils::decode(data, nid, 48U, 114U);
// XXX Process FEC here
m_duid = nid[1U] & 0x0FU;
m_nac = (nid[0U] << 4) & 0xFF0U;
m_nac |= (nid[1U] >> 4) & 0x00FU;
CP25Utils::encode(nid, data, 48U, 114U);
return true;
}
unsigned char CP25NID::getDUID() const