<>AT指令编解码-有帧头帧尾的编解码

参考:https://www.cnblogs.com/chucklu/p/6428615.html
<https://www.cnblogs.com/chucklu/p/6428615.html>
#include <stdio.h> #include <string.h> #define MAX_SIZE 1024 int bw_getFrame(
unsigned char *buf, int len) { int i = 0; int ret; unsigned char head[5] = {0x0d
, 0x0a, '+', 'r','='}; /*头帧标志符号*/ unsigned char tail[2] = {0x0d, 0x0a};
/*尾帧标志符号*/ int len_head = 5; int len_tail = 2; unsigned char *pData = NULL; int
iData= 0; unsigned char *pDataEnd= NULL; int bHasHead = 0; unsigned char Payload
[MAX_SIZE]= {0}; int lenPayload = 0; unsigned char tmp[MAX_SIZE] = {0}; int
lentmp= 0; print_dbg("[i, len] = [%d, %d]\n", i, len); if(len <= len_head +
len_tail){ memcpy(tmp, buf, len); lentmp += len; /* TODO: read time out */
unsigned char more[6] = {'=', 0x33, 0x34, 0x35 ,0x0d, 0x0a}; ret = 6; if(ret <=
0){ return -1; } memcpy(&tmp[lentmp], more, ret); lentmp += ret; print_buf(tmp,
lentmp); bw_getFrame(tmp, lentmp); return 0; } while(i < len){ if(!bHasHead){
ret= memcmp(head, &buf[i], len_head); if(ret == 0){ i += len_head; pData = &buf[
i]; iData = i; bHasHead = 1; continue; }else{ goto next; } }else{ ret = memcmp(
tail, &buf[i], len_tail); if(ret == 0){ pDataEnd = &buf[i]; /* complete a frame
*/ //print_dbg("[i] = [%d]\n", i); print_buf(pData, (pDataEnd-pData)); i +=
len_tail; if(i+1 < len){ print_dbg("has more\n"); /* reset var*/ bw_getFrame(&
buf[i], len-i); return 0; } }else{ Payload[lenPayload++] = buf[i]; goto next; }
} next: i++; } return 0; } int main() { /*输入一个带头帧和尾帧的字符串*/ //char str[MAX_SIZE];
//printf("Please input str"); //scanf("%s",str); unsigned char buf[100] = {0x0d,
0x0a, '+', 'r'}; unsigned char buf0[100] = {0x0d, 0x0a, '+', 'r', '='}; unsigned
char buf1[100] = {0x0d, 0x0a, '+', 'r','=', 0x33, 0x34, 0x35 ,0x0d, 0x0a};
unsigned char buf2[100] = {0x0d, 0x0a, '+', 'r','=', 0x33, 0x34, 0x35 ,0x0d,
0x0a, 0x0d, 0x0a, '+', 'r','=', 0x77, 0x77,0x77 ,0x0d, 0x0a}; unsigned char buf3
[100] = {0x0d, 0x0a, '+', 'r','=', 0x33, 0x34, 0x35 ,0x0d, 0x0a, 0x0d, 0x0a, '+'
, 'r','=', 0x77, 0x77, 0x77 ,0x0d, 0x0a, 0x0d, 0x0a, '+', 'r','=', 0x00, 0x00,
0x00 ,0x0d, 0x0a, 0x0d, 0x0a, '+', 'r','=', 0x88, 0x88, 0x88 ,0x0d, 0x0a}; //
bw_getFrame(buf, 4); bw_getFrame(buf0, 5); // bw_getFrame(buf3, 20);
//bw_getFrame(buf2, 20); return 0; }