Robin Mueller
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92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
//**************************************************************************************
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/*! \copyright: 2020-2021 Thales Alenia Space Deutschland GmbH
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* \project: multiMIND
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* \file: (name of source file: hdlc.c)
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* \date: (09.02.2022)
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* \author: (Stelios Filippopoulos)
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* \brief: (hdlc functions)
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* \language: (C)
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**************************************************************************************
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*/
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#include "tas/hdlc.h"
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#include "tas/crc.h"
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#include <stdint.h>
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void hdlc_add_byte(uint8_t ch, uint8_t *buff, size_t *pos)
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{
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size_t templen = *pos;
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if ((ch == 0x7E) ||
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(ch == 0x7D) ||
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(ch == 0x7C))
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{
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buff[templen++] = 0x7D;
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ch ^= 0x20;
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}
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buff[templen++] = ch;
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*pos = templen;
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}
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void hdlc_add_framing(const uint8_t *src, size_t slen, uint8_t *dst, size_t *dlen)
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{
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size_t tlen = 0;
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uint16_t ii;
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uint16_t crc16;
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uint8_t bt;
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// calc crc16
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crc16 = calc_crc16_buff_reflected( src, slen );
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dst[tlen++] = 0x7E;
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for (ii = 0; ii < slen; ii++)
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{
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bt = *src++;
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hdlc_add_byte(bt, dst, &tlen);
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}
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// hdlc crc16 is in little endian format
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// WARNING: This is not portable code! Bytes need to be swapped on a big
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// endian system
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// TODO: Fix
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hdlc_add_byte((uint8_t) (crc16 & 0xFF), dst, &tlen);
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hdlc_add_byte((uint8_t) ((crc16 >> 8) & 0xFF), dst, &tlen);
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dst[tlen++] = 0x7C;
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*dlen = tlen;
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}
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int hdlc_remove_framing_with_crc_check(const uint8_t *src, size_t slen, uint8_t *dst, size_t *dlen)
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{
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uint16_t tlen = 0;
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uint16_t ii;
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uint8_t bt;
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*dlen = 0;
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if (slen < 4) return -1;
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if ((src[tlen] != 0x7E) && (src[slen-1] != 0x7C)) return -2;
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src++;
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for (ii = 1; ii < slen-1; ii++)
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{
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bt = *src++;
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if (bt == 0x7D)
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{
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bt = *src++ ^ 0x20;
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ii++;
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}
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dst[tlen++] = bt;
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}
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// calc crc16
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// TODO: Warning: This does not work because the CRC16 is little endian
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if(calc_crc16_buff_reflected( dst, tlen ) != 0) {
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return 1;
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}
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*dlen = tlen - 2;
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return 0;
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}
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