| /**
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| *
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| * @file hdlc.c
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| * @brief
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| * This file is part of tools.
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| * hdlc encode/decode lib
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| *
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| * @details
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| * @author Tools Team.
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| * @email
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| * @copyright Copyright (C) 2013 Sanechips Technology Co., Ltd.
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| * @warning
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| * @date 2019/02/02
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| * @version 1.1
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| * @pre
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| * @post
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| *
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| * @par
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| * Change History :
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| * ---------------------------------------------------------------------------
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| * date version author description
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| * ---------------------------------------------------------------------------
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| * 2013/01/21 1.0 lu.xieji Create file
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| * 2019/02/02 1.1 jiang.fenglin ÐÞ¸Ä×¢ÊÍ·½Ê½Îªdoxygen
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| * ---------------------------------------------------------------------------
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| *
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| *
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| */
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|
|
|
|
| #include "log_agent.h"
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|
|
| #define HDLC_CONTROL_CHAR 0x7E // ½áÊø·û
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| #define HDLC_ESC_CHAR 0x7D // תÒë×Ö·ûÖµ
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| #define HDLC_ESC_MASK 0x20 // תÒëÔËËãÖµ
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| #define HDLC_TAIL_SIZE 3 // β²¿Ìí¼Ó×Ö·û³¤¶È
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|
|
| // CRC table for 16 bit CRC, with generator polynomial 0x8408, calculated 8 bits at a time, LSB first.
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| #define CRC_TAB_SIZE 256 // 2^CRC_TAB_BITS
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| #define CRC_16_L_SEED 0xFFFF
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| #define CRC_16_L_POLYNOMIAL 0x8408
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| #define CRC_16_L_OK 0x0F47
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|
|
| #define CRC_16_L_STEP(xx_crc, xx_c) \
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| (((xx_crc) >> 8) ^ crc_16_l_table[((xx_crc) ^ (xx_c)) & 0x00ff])
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|
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| const unsigned short crc_16_l_table[CRC_TAB_SIZE] =
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| {
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| 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
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| 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
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| 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
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| 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
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| 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
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| 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
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| 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
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| 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
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| 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
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| 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
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| 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
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| 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
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| 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
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| 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
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| 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
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| 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
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| 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
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| 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
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| 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
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| 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
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| 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
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| 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
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| 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
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| 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
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| 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
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| 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
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| 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
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| 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
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| 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
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| 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
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| 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
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| 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
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| };
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|
|
|
|
| /**
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| * @brief HDLC±àÂë
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| * @param[out] dest Ä¿±êT_HDLC_BUFFER_TYPEÖ¸Õë
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| * @param[in] src Ô´T_HDLC_BUFFER_TYPEÖ¸Õë
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| * @return ³É¹¦·µ»ØTRUE£»Ê§°Ü·µ»ØFALSE
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| * @note
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| * @see
|
| */
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| BOOL hdlc_encode(T_HDLC_BUFFER_TYPE *dest, const T_HDLC_BUFFER_TYPE *src)
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| {
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| if (dest && src && dest->buf && src->buf \
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| && dest->bufSize > dest->bufIndex && src->bufSize > src->bufIndex)
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| {
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| unsigned char *dest_buf = dest->buf + dest->bufIndex;
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| unsigned char *src_buf = src->buf + src->bufIndex;
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| unsigned char src_byte = 0;
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| unsigned short crc = CRC_16_L_SEED;
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| unsigned int converted_length = 0;
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| unsigned int i, src_length;
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| src_length = src->bufSize - src->bufIndex;
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|
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| for (i = 0; i < src_length; i++)
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| {
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| src_byte = src_buf[i];
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|
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| if ((src_byte == HDLC_CONTROL_CHAR) || (src_byte == HDLC_ESC_CHAR))
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| {
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| crc = CRC_16_L_STEP(crc, src_byte);
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| dest_buf[converted_length++] = HDLC_ESC_CHAR;
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| dest_buf[converted_length++] = src_byte ^ HDLC_ESC_MASK;
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| }
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| else
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| {
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| crc = CRC_16_L_STEP(crc, src_byte);
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| dest_buf[converted_length++] = src_byte;
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| }
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| }
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|
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| crc = ~crc;
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| // ¶ÔµÚÒ»¸öunsigned charµÄcrc½øÐÐתÒë
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| src_byte = (crc & 0xFF);
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|
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| if ((src_byte == HDLC_CONTROL_CHAR) || (src_byte == HDLC_ESC_CHAR))
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| {
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| dest_buf[converted_length++] = HDLC_ESC_CHAR;
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| dest_buf[converted_length++] = src_byte ^ HDLC_ESC_MASK;
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| }
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| else
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| {
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| dest_buf[converted_length++] = src_byte;
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| }
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|
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| // ¶ÔµÚ¶þ¸öunsigned charµÄcrc½øÐÐתÒë
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| src_byte = (crc >> 8);
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|
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| if ((src_byte == HDLC_CONTROL_CHAR) || (src_byte == HDLC_ESC_CHAR))
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| {
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| dest_buf[converted_length++] = HDLC_ESC_CHAR;
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| dest_buf[converted_length++] = src_byte ^ HDLC_ESC_MASK;
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| }
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| else
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| {
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| dest_buf[converted_length++] = src_byte;
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| }
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|
|
| // Ìí¼Ó½áÊø·û
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| dest_buf[converted_length++] = HDLC_CONTROL_CHAR;
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| dest->bufIndex = converted_length;
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| return TRUE;
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| }
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| else
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| {
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| return FALSE;
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| }
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| }
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|
|
| /**
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| * @brief 16λcrcУÑé¼ÆË㣬
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| * @param[in] buf_ptr ´ýУÑéÊý¾ÝÖ¸Õë
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| * @param[in] len ´ýУÑéÊý¾Ý³¤¶È
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| * @return crcУÑéÖµ£¬Èç¹ûbuf_ptr×îºóÁ½Î»°üº¬ÁËУÑ飬½«·µ»ØCRC_16_L_OK
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| * @note
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| * @see
|
| */
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| unsigned short crc_16_l_calc(unsigned char *buf_ptr, unsigned int len)
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| {
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| unsigned short crc_16;
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|
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| for (crc_16 = CRC_16_L_SEED ; len >= 8; len -= 8, buf_ptr++)
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| {
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| crc_16 = crc_16_l_table[(crc_16 ^ *buf_ptr) & 0x00ff ] ^ (crc_16 >> 8);
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| }
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|
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| return(~crc_16);
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| }
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|
|
|
|
| /**
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| * @brief HDLC½âÂë
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| * @param[out] dest Ä¿±êT_HDLC_BUFFER_TYPEÖ¸Õë
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| * @param[in] src Ô´T_HDLC_BUFFER_TYPEÖ¸Õë
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| * @return ³É¹¦·µ»ØTRUE£»Ê§°Ü·µ»ØFALSE
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| * @note
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| * @see
|
| */
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| BOOL hdlc_decode(T_HDLC_BUFFER_TYPE *dest, T_HDLC_BUFFER_TYPE *src)
|
| {
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| if (dest != NULL && src != NULL && dest->buf != NULL && src->buf != NULL &&
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| src->bufSize > src->bufIndex && dest->bufSize > dest->bufIndex)
|
| {
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| unsigned char *dest_buf = dest->buf + dest->bufIndex;
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| unsigned char *src_buf = src->buf + src->bufIndex;
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| unsigned int dest_length = dest->bufSize - dest->bufIndex;
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| unsigned int src_length = src->bufSize - src->bufIndex;
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|
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| unsigned char src_byte = 0;
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| unsigned int converted_length = 0;
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| BOOL findEnd = FALSE;
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| unsigned int i;
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|
|
| for (i = 0; i < src_length; i++)
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| {
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| src_byte = src_buf[i];
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|
|
| if (src_byte == HDLC_ESC_CHAR)
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| {
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| if (i == (src_length - 1))
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| {
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| break;
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| }
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| else
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| {
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| dest_buf[converted_length++] = src_buf[++i] ^ HDLC_ESC_MASK;
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| }
|
| }
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| else if (src_byte == HDLC_CONTROL_CHAR)
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| {
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| dest_buf[converted_length++] = src_byte;
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| i++;
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| findEnd = TRUE;
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| break;
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| }
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| else
|
| {
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| dest_buf[converted_length++] = src_byte;
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| }
|
|
|
| if (converted_length >= dest_length)
|
| {
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| i++;
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| break;
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| }
|
| }
|
|
|
| src->bufIndex += i;
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| dest->bufIndex += converted_length;
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|
|
| if (findEnd)
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| {
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| unsigned short crc = crc_16_l_calc(dest->buf, (dest->bufIndex - 1) * 8);
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|
|
| if (crc == CRC_16_L_OK)
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| {
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| dest->bufIndex -= HDLC_TAIL_SIZE;
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| }
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| else
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| {
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| dest->bufIndex = 0;
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| findEnd = FALSE;
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| }
|
| }
|
|
|
| return findEnd;
|
| }
|
| else
|
| {
|
| return FALSE;
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| }
|
| }
|
|
|