From 448a7c81fb0d7cda298c7faad8e407aa4cb70315 Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Wed, 26 Jun 2019 02:07:39 +0800
Subject: [PATCH] Merge branch 'master' of ssh://master.iot-yun.com:2280/apue
---
ch8_tlv/tlv_sample.c | 222 +++++++++++++++++++++++++++++++
ch8_tlv/makefile | 11 +
ch8_tlv/树莓派监控项目TLV报文格式.docx | 0
ch8_tlv/crc-itu-t.c | 95 +++++++++++++
ch8_tlv/浅谈自定义通讯协议TLV.docx | 0
ch8_tlv/crc-itu-t.h | 55 +++++++
6 files changed, 383 insertions(+), 0 deletions(-)
diff --git a/ch8_tlv/crc-itu-t.c b/ch8_tlv/crc-itu-t.c
new file mode 100644
index 0000000..5097a8b
--- /dev/null
+++ b/ch8_tlv/crc-itu-t.c
@@ -0,0 +1,95 @@
+/*
+ * crc-itu-t.c
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include "crc-itu-t.h"
+
+/** CRC table for the CRC ITU-T V.41 0x0x1021 (x^16 + x^12 + x^15 + 1) */
+const unsigned short crc_itu_t_table[256] = {
+ 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
+ 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
+ 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
+ 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
+ 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
+ 0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
+ 0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
+ 0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
+ 0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
+ 0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
+ 0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
+ 0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
+ 0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
+ 0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
+ 0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
+ 0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
+ 0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
+ 0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
+ 0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
+ 0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
+ 0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
+ 0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
+ 0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
+ 0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
+ 0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
+ 0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
+ 0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
+ 0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
+ 0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
+ 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
+ 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
+ 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
+};
+
+/**
+ * crc_itu_t - Compute the CRC-ITU-T for the data buffer
+ *
+ * @crc: previous CRC value
+ * @buffer: data pointer
+ * @len: number of bytes in the buffer
+ *
+ * Returns the updated CRC value
+ */
+unsigned short crc_itu_t(unsigned short crc, const unsigned char *buffer, unsigned int len)
+{
+ while (len--)
+ crc = crc_itu_t_byte(crc, *buffer++);
+ return crc;
+}
+
+int ushort_to_bytes(unsigned char *bytes, unsigned short val)
+{
+ int size = sizeof (unsigned short);
+ int i = 0;
+
+ if( !bytes )
+ return 0;
+
+ while (size)
+ {
+ *(bytes + --size) = (val >> ((8 * i++) & 0xFF));
+ }
+
+ return sizeof(unsigned short);
+}
+
+unsigned short bytes_to_ushort(unsigned char *bytes, int len)
+{
+ int i = 0;
+ unsigned short val = 0;
+
+ if( !bytes || len > sizeof(unsigned short) )
+ return 0;
+
+ for(i=0; i<len; i++)
+ {
+ val += bytes[i];
+
+ if (i < len - 1)
+ val = val << 8;
+ }
+
+ return val;
+}
diff --git a/ch8_tlv/crc-itu-t.h b/ch8_tlv/crc-itu-t.h
new file mode 100644
index 0000000..e054724
--- /dev/null
+++ b/ch8_tlv/crc-itu-t.h
@@ -0,0 +1,55 @@
+/*
+ * crc-itu-t.h - CRC ITU-T V.41 routine
+ *
+ * Implements the standard CRC ITU-T V.41:
+ * Width 16
+ * Poly 0x0x1021 (x^16 + x^12 + x^15 + 1)
+ * Init 0
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#ifndef CRC_ITU_T_H
+#define CRC_ITU_T_H
+
+#define MAGIC_CRC 0x1E50
+
+extern const unsigned short crc_itu_t_table[256];
+
+
+/**
+ * crc_itu_t - Compute the CRC-ITU-T for the data buffer
+ *
+ * @crc: previous CRC value, we use $IoT_MAGIC_CRC
+ * @buffer: data pointer
+ * @len: number of bytes in the buffer
+ *
+ * Returns the updated CRC value
+ */
+extern unsigned short crc_itu_t(unsigned short magic_crc, const unsigned char *buffer, unsigned int len);
+
+
+/*
+ * ushort_to_bytes - Convert unsigned short CRC16 value to two bytes
+ * @bytes: two bytes CRC16 value saving buffer, buffer size must more than 2 bytes
+ * @crc: crc_itu_t() compute returnd value( unsigned short CRC16 checksum)
+ */
+extern int ushort_to_bytes(unsigned char *bytes, unsigned short val);
+
+
+/*
+ * bytes_to_ushort - Convert two bytes mode CRC value into unsigned short CRC16 value
+ * @bytes: bytes mode CRC value first byte position
+ * @len: bytes mode CRC value length
+ */
+extern unsigned short bytes_to_ushort(unsigned char *bytes, int len);
+
+
+static inline unsigned short crc_itu_t_byte(unsigned short crc, const unsigned char data)
+{
+ return (crc << 8) ^ crc_itu_t_table[((crc >> 8) ^ data) & 0xff];
+}
+
+#endif /* CRC_ITU_T_H */
+
diff --git a/ch8_tlv/makefile b/ch8_tlv/makefile
new file mode 100644
index 0000000..53d7f60
--- /dev/null
+++ b/ch8_tlv/makefile
@@ -0,0 +1,11 @@
+
+BINAME=tlv_sample
+
+all:
+ gcc *.c -o ${BINAME}
+
+clean:
+ rm -f ${BINAME}
+
+run: all
+ ./${BINAME}
diff --git a/ch8_tlv/tlv_sample.c b/ch8_tlv/tlv_sample.c
new file mode 100644
index 0000000..b86184f
--- /dev/null
+++ b/ch8_tlv/tlv_sample.c
@@ -0,0 +1,222 @@
+/*********************************************************************************
+ * Copyright: (C) 2019 LingYun IoT studio
+ * All rights reserved.
+ *
+ * Filename: tlv_sample.c
+ * Description: This file
+ *
+ * Version: 1.0.0(03/27/2019)
+ * Author: Guo Wenxue <guowenxue@gmail.com>
+ * ChangeLog: 1, Release initial version on "03/27/2019 09:20:25 PM"
+ *
+ ********************************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include "crc-itu-t.h"
+
+#define OFF 0
+#define ON 1
+
+#define BUFSIZE 128
+
+/* TLV Packet format:
+ *
+ *+------------+---------+------------+-----------+-----------+
+ *| Header(1B) | Tag(1B) | Length(1B) | Value(1B) | CRC16(2B) |
+ *+------------+---------+------------+-----------+-----------+
+ */
+
+#define PACK_HEADER 0xFD
+
+/* Tag definition */
+enum
+{
+ TAG_LOGON=1,
+ TAG_CAMERA,
+ TAG_LED,
+};
+
+/* TLV packet fixed segement size, 1B Head, 1B Tag, 1B length, 2B CRC16, total 5B. */
+#define TLV_FIXED_SIZE 5
+
+/* TLV packet Minimum size is fixed bytes + 1 byte data */
+#define TLV_MIN_SIZE (TLV_FIXED_SIZE+1)
+
+int packtlv_logon(char *buf, int size, char *pwd);
+int packtlv_led(char *buf, int size, int cmd);
+void dump_buf(char *data, int len);
+
+int main(int argc, char **argv)
+{
+ char buf[BUFSIZE];
+ int bytes;
+
+ bytes = packtlv_led(buf, sizeof(buf), ON);
+
+ /* print every byte in the buffer as HEX and corresponding charactor,
+ which is not printable charactor will be instead as '?' */
+ dump_buf(buf, bytes);
+
+ bytes = packtlv_logon(buf, sizeof(buf), "iot@yun");
+
+ dump_buf(buf, bytes);
+
+ return 0;
+}
+
+
+int packtlv_logon(char *buf, int size, char *pwd)
+{
+ unsigned short crc16 = 0;
+ int pack_len = 0;
+ int data_len = 0;
+ int ofset = 0; /* index position for the buf */
+
+ if(!buf || !pwd || size<TLV_MIN_SIZE )
+ {
+ printf("Invalid input arguments\n");
+ return 0;
+ }
+
+ /* Packet head */
+ buf[ofset] = PACK_HEADER;
+ ofset += 1;
+
+ /* Tag */
+ buf[ofset] = TAG_LOGON;
+ ofset += 1;
+
+ /* $pwd too long maybe result buffer overflow, so we need check the buffer
+ * is large enuf or not. If buf size is not enuf we will truncate $pwd string */
+ if( strlen(pwd) <= size-TLV_FIXED_SIZE )
+ data_len = strlen(pwd);
+ else
+ data_len = size-TLV_FIXED_SIZE;
+
+ /* Length, this packet is passwd length+5Byte () */
+ pack_len = data_len + TLV_FIXED_SIZE;
+
+ buf[ofset] = pack_len;
+ ofset += 1;
+
+ memcpy(&buf[ofset], pwd, data_len);
+ ofset += data_len;
+
+ /* Calc CRC16 checksum value from Packet Head(buf[0])~ Value(buf[ofset]) */
+ crc16 = crc_itu_t(MAGIC_CRC, buf, ofset);
+
+ /* Append the 2 Bytes CRC16 checksum value into the last two bytes in packet buffer */
+ ushort_to_bytes(&buf[ofset], crc16);
+ ofset += 2;
+
+ return ofset;
+}
+
+
+
+int packtlv_led(char *buf, int size, int cmd)
+{
+ unsigned short crc16;
+ int pack_len = TLV_FIXED_SIZE+1; /* Only 1 byte data */
+
+ if(!buf || size<TLV_MIN_SIZE )
+ {
+ printf("Invalid input arguments\n");
+ return 0;
+ }
+
+ /* Packet head */
+ buf[0] = PACK_HEADER;
+
+ /* Tag */
+ buf[1] = TAG_LED;
+
+ /* Length, this packet total 6 bytes */
+ buf[2] = pack_len;
+
+ /* Value */
+ buf[3] = (OFF==cmd) ? 0x00 : 0x01;
+
+ /* Calc CRC16 checksum value from Packet Head(buf[0])~ Packet Value(buf[3]) */
+ crc16 = crc_itu_t(MAGIC_CRC, buf, 4);
+
+ /* Append the 2 Bytes CRC16 checksum value into the last two bytes in packet buffer */
+ ushort_to_bytes(&buf[4], crc16);
+
+ return pack_len;
+}
+
+
+/*+------------------------------+
+ *| dump_buf() implement code |
+ *+------------------------------+*/
+
+#define LINELEN 81
+#define CHARS_PER_LINE 16
+
+static char *print_char =
+ " "
+ " "
+ " !\"#$%&'()*+,-./"
+ "0123456789:;<=>?"
+ "@ABCDEFGHIJKLMNO"
+ "PQRSTUVWXYZ[\\]^_"
+ "`abcdefghijklmno"
+ "pqrstuvwxyz{|}~ "
+ " "
+ " "
+ " ???????????????"
+ "????????????????"
+ "????????????????"
+ "????????????????"
+ "????????????????"
+ "????????????????";
+
+/* print every byte in the buffer as HEX and corresponding charactor, which is not printable charactor will be instead as '?' */
+void dump_buf(char *data, int len)
+{
+ int rc;
+ int idx;
+ char prn[LINELEN];
+ char lit[CHARS_PER_LINE + 1];
+ char hc[4];
+ short line_done = 1;
+
+ rc = len;
+ idx = 0;
+ lit[CHARS_PER_LINE] = '\0';
+
+ while (rc > 0)
+ {
+ if (line_done)
+ snprintf(prn, LINELEN, "%08X: ", idx);
+ do
+ {
+ unsigned char c = data[idx];
+ snprintf(hc, 4, "%02X ", c);
+ strncat(prn, hc, 4);
+ lit[idx % CHARS_PER_LINE] = print_char[c];
+ ++idx;
+ } while (--rc > 0 && (idx % CHARS_PER_LINE != 0));
+
+ line_done = (idx % CHARS_PER_LINE) == 0;
+
+ if (line_done)
+ printf("%s %s\n", prn, lit);
+ else if (rc == 0)
+ strncat(prn, " ", LINELEN);
+ }
+
+ if (!line_done)
+ {
+ lit[(idx % CHARS_PER_LINE)] = '\0';
+
+ while ((++idx % CHARS_PER_LINE) != 0)
+ strncat(prn, " ", LINELEN);
+
+ printf("%s %s\n", prn, lit);
+
+ }
+}
+
diff --git "a/ch8_tlv/\346\240\221\350\216\223\346\264\276\347\233\221\346\216\247\351\241\271\347\233\256TLV\346\212\245\346\226\207\346\240\274\345\274\217.docx" "b/ch8_tlv/\346\240\221\350\216\223\346\264\276\347\233\221\346\216\247\351\241\271\347\233\256TLV\346\212\245\346\226\207\346\240\274\345\274\217.docx"
new file mode 100644
index 0000000..0965f6f
--- /dev/null
+++ "b/ch8_tlv/\346\240\221\350\216\223\346\264\276\347\233\221\346\216\247\351\241\271\347\233\256TLV\346\212\245\346\226\207\346\240\274\345\274\217.docx"
Binary files differ
diff --git "a/ch8_tlv/\346\265\205\350\260\210\350\207\252\345\256\232\344\271\211\351\200\232\350\256\257\345\215\217\350\256\256TLV.docx" "b/ch8_tlv/\346\265\205\350\260\210\350\207\252\345\256\232\344\271\211\351\200\232\350\256\257\345\215\217\350\256\256TLV.docx"
new file mode 100644
index 0000000..75c7ba9
--- /dev/null
+++ "b/ch8_tlv/\346\265\205\350\260\210\350\207\252\345\256\232\344\271\211\351\200\232\350\256\257\345\215\217\350\256\256TLV.docx"
Binary files differ
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