十六进制字符串转字节序列

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<pre name="code" class="cpp">// NOTE: in mind
//
// '0':48 
// 'A':65 
// 'a':97
//

#define CHAR2INT(_c, _d) \
	do { \
	if(_c >= '0' && _c <= '9') _d = _c - 48; \
	else if(_c >= 'A' && _c <= 'F') _d = _c - 55; \
	else if(_c >= 'a' && _c <= 'f') _d = _c - 87; \
	else _d = -1; \
	}while(0);
#define STRING2BYTES(_src, _dst, _dstlen) \
	do {\
	int h, l;\
	int _srclen = strlen(_src); \
	if(_srclen == 1) _dstlen = 1; else _dstlen = _srclen / 2; \
	_dst = (char *)malloc(_dstlen + 1); \
	if(!_dst) break; \
	memset(_dst, '\0', _dstlen + 1); \
	if(_srclen == 1) {CHAR2INT(_src[0], l); _dst[0] = (unsigned char)l; break;} \
	for(int i=0, j=0; j<_srclen; i++, j+=2) { \
	CHAR2INT(_src[j], h); CHAR2INT(_src[j + 1], l); \
	_dst[i] = (unsigned char)(h << 4 | l); } \
	}while(0);

#define FREESTRING2BYTES(_src) if(_src) free(_src); _src = NULL;