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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| /* | ||
| * Copyright (C) 2015,2016,2017,2018 Jonathan Naylor, G4KLX | ||
| * Copyright (C) 2018 by Shawn Chain, BG5HHP | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; version 2 of the License. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| */ | ||
|
|
||
| #include "DMRTA.h" | ||
| #include "Log.h" | ||
|
|
||
| #include <cstring> | ||
| #include <cassert> | ||
|
|
||
| CDMRTA::CDMRTA() : | ||
| m_TA(), | ||
| m_buf() | ||
| { | ||
| } | ||
|
|
||
| CDMRTA::~CDMRTA() | ||
| { | ||
| } | ||
|
|
||
| bool CDMRTA::add(unsigned int blockId, const unsigned char* data, unsigned int len) | ||
| { | ||
| assert(data != NULL); | ||
| if (blockId > 3) { | ||
| // invalid block id | ||
| reset(); | ||
| return false; | ||
| } | ||
|
|
||
| unsigned int offset = blockId * 7; | ||
|
|
||
| if (offset + len >= sizeof(m_buf)) { | ||
| // buffer overflow | ||
| reset(); | ||
| return false; | ||
| } | ||
|
|
||
| ::memcpy(m_buf + offset, data, len); | ||
|
|
||
| return decodeTA(); | ||
| } | ||
|
|
||
| const unsigned char* CDMRTA::get() | ||
| { | ||
| return (unsigned char*)m_TA; | ||
| } | ||
|
|
||
| void CDMRTA::reset() | ||
| { | ||
| ::memset(m_TA, 0, sizeof(m_TA)); | ||
| ::memset(m_buf, 0, sizeof(m_buf)); | ||
| } | ||
|
|
||
| bool CDMRTA::decodeTA() | ||
| { | ||
| unsigned char *b; | ||
| unsigned char c; | ||
| int j; | ||
| unsigned int i, t1, t2; | ||
|
|
||
| unsigned char* talkerAlias = m_buf; | ||
|
|
||
| unsigned int TAformat = (talkerAlias[0] >> 6U) & 0x03U; | ||
| unsigned int TAsize = (talkerAlias[0] >> 1U) & 0x1FU; | ||
| ::strncpy(m_TA, "(could not decode)", sizeof(m_TA)); | ||
|
|
||
| switch (TAformat) { | ||
| case 0U: // 7 bit | ||
| ::memset(m_TA, 0, sizeof(m_TA)); | ||
| b = &talkerAlias[0]; | ||
| t1 = 0U; t2 = 0U; c = 0U; | ||
| for (i = 0U; (i < 32U) && (t2 < TAsize); i++) { | ||
| for (j = 7; j >= 0; j--) { | ||
| c = (c << 1U) | (b[i] >> j); | ||
| if (++t1 == 7U) { | ||
| if (i > 0U) | ||
| m_TA[t2++] = c & 0x7FU; | ||
|
|
||
| t1 = 0U; | ||
| c = 0U; | ||
| } | ||
| } | ||
| } | ||
| m_TA[TAsize] = 0; | ||
| break; | ||
|
|
||
| case 1U: // ISO 8 bit | ||
| case 2U: // UTF8 | ||
| ::strncpy(m_TA, (char*)talkerAlias + 1U, sizeof(m_TA)); | ||
| break; | ||
|
|
||
| case 3U: // UTF16 poor man's conversion | ||
| t2=0; | ||
| ::memset(&m_TA, 0, sizeof(m_TA)); | ||
| for (i = 0U; (i < 15U) && (t2 < TAsize); i++) { | ||
| if (talkerAlias[2U * i + 1U] == 0) | ||
| m_TA[t2++] = talkerAlias[2U * i + 2U]; | ||
| else | ||
| m_TA[t2++] = '?'; | ||
| } | ||
| m_TA[TAsize] = 0; | ||
| break; | ||
| } | ||
|
|
||
| size_t TAlen = ::strlen(m_TA); | ||
| LogMessage("DMR Talker Alias (Data Format %u, Received %u/%u char): '%s'", TAformat, TAlen, TAsize, m_TA); | ||
|
|
||
| if (TAlen > TAsize) { | ||
| if (TAlen < 29U) | ||
| strcat(m_TA," ?"); | ||
| else | ||
| strcpy(m_TA + 28U," ?"); | ||
| } | ||
|
|
||
| return TAlen >= TAsize; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| /* | ||
| * Copyright (C) 2015,2016,2017,2018 Jonathan Naylor, G4KLX | ||
| * Copyright (C) 2018 by Shawn Chain, BG5HHP | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation; version 2 of the License. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| */ | ||
|
|
||
| #ifndef DMRTA_H | ||
| #define DMRTA_H | ||
|
|
||
| class CDMRTA { | ||
| public: | ||
| CDMRTA(); | ||
| ~CDMRTA(); | ||
|
|
||
| bool add(unsigned int blockId, const unsigned char* data, unsigned int len); | ||
| const unsigned char* get(); | ||
| void reset(); | ||
|
|
||
| protected: | ||
| bool decodeTA(); | ||
|
|
||
| private: | ||
| char m_TA[32]; | ||
| unsigned char m_buf[32]; | ||
| }; | ||
|
|
||
| #endif |
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