111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
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/*
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* Copyright (C) 2015,2016,2017,2018 Jonathan Naylor, G4KLX
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* Copyright (C) 2018 by Shawn Chain, BG5HHP
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "DMRTA.h"
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#include "Log.h"
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#include <cstring>
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CDMRTA::CDMRTA() :
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m_TA(),
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m_buf(),
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m_bufOffset(0)
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{
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}
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CDMRTA::~CDMRTA() {
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}
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bool CDMRTA::add(const unsigned char* data, unsigned int len) {
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assert(data);
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if (m_bufOffset + len >= sizeof(m_buf)) {
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// buffer overflow
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reset();
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return false;
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}
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::memcpy(m_buf + m_bufOffset, data, len);
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m_bufOffset += len;
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decodeTA();
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return true;
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}
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const unsigned char* CDMRTA::get() {
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return (unsigned char*)m_TA;
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}
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void CDMRTA::reset() {
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::memset(m_TA, 0, sizeof(m_TA));
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::memset(m_buf, 0, sizeof(m_buf));
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m_bufOffset = 0;
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}
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void CDMRTA::decodeTA() {
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unsigned char *b;
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unsigned char c;
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int j;
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unsigned int i,t1,t2, TAsize, TAformat;
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unsigned char* talkerAlias = m_buf;
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TAformat=(talkerAlias[0]>>6U) & 0x03U;
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TAsize = (talkerAlias[0]>>1U) & 0x1FU;
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::strncpy(m_TA, "(could not decode)", sizeof(m_TA));
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switch (TAformat) {
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case 0U: // 7 bit
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::memset(m_TA, 0, sizeof(m_TA));
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b=&talkerAlias[0];
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t1=0; t2=0; c=0;
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for (i=0; (i<32U)&&(t2<TAsize); i++) {
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for (j=7U;j>=0;j--) {
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c = (c<<1U) | (b[i] >> j);
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if (++t1==7U) {
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if (i>0) {
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m_TA[t2++]=c & 0x7FU;
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}
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t1=0;
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c=0;
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}
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}
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}
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m_TA[TAsize]=0;
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break;
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case 1U: // ISO 8 bit
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case 2U: // UTF8
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::strncpy(m_TA,(char*)talkerAlias+1U, sizeof(m_TA));
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break;
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case 3U: // UTF16 poor man's conversion
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t2=0;
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::memset (&m_TA,0,sizeof(m_TA));
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for(i=0; (i<15)&&(t2<TAsize); i++) {
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if (talkerAlias[2U*i+1U]==0)
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m_TA[t2++] = talkerAlias[2U*i+2U];
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else
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m_TA[t2++] = '?';
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}
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m_TA[TAsize]=0;
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break;
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}
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LogMessage("DMR Talker Alias (Data Format %u, Received %u/%u char): '%s'", TAformat, ::strlen(m_TA), TAsize, m_TA);
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if (::strlen(m_TA)>TAsize) {
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if (strlen(m_TA)<29U)
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strcat(m_TA," ?");
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else
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strcpy(m_TA+28U," ?");
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}
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}
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