十六进制 打印数据

#ifdef _MSC_VER
#define snprintf(output,len,fmt,... )  sprintf_s(output,len,fmt,##__VA_ARGS__)
#endif // _MSC_VER
#ifdef DEBUG_DUMP_HEX_
#define DUMP_HEX_VVLOG printf("[%d]maxLen=%d offset=%d  delta=%d \n",__LINE__,maxLen,offset,(maxLen-offset));
#else 
#define DUMP_HEX_VVLOG
#endif
int DumpHex(char* buffer,int maxLen, const char* input, int len) {
	int offset = 0;
	int j,  done;
	int maxBit = 2;
	int temp = 10;
	done = 0;
	
	for(int i=0;i<10;i++){
		temp *= 10;
		if(len > temp ){
			maxBit ++;
		}
	}
	if(buffer == NULL || maxLen == 0){
		return (int)ceil(len*1.0/16) * (63 + maxBit * 2) ;
	}
	DUMP_HEX_VVLOG
	for (int i = 0; i < len; i += 16) {
		offset += snprintf(buffer+offset,maxLen-offset, "\n%0*d-%0*d: ", maxBit,(i),maxBit, (i + 16));
		//printf("[%d]maxLen=%d offset=%d  delta=%d %s\n",__LINE__,maxLen,offset,(maxLen-offset),buffer);
		for (j = 0; j < 16 && (0< (maxLen-offset)); j++) {
			DUMP_HEX_VVLOG
			int pos = i + j;
			if (pos >= len) {
				done = 1;
			}
			if (!done) {
				int c = (input[pos] & 0xff);
				offset += snprintf(buffer+offset,maxLen-offset,"%02x", c);
				DUMP_HEX_VVLOG
			} else {
				offset += snprintf(buffer+offset,maxLen-offset, "--");
				DUMP_HEX_VVLOG
			}
			if ((j & 3) == 3) {
				offset += snprintf(buffer+offset,maxLen-offset, " ");
				DUMP_HEX_VVLOG
			}
		}
		DUMP_HEX_VVLOG
		offset += snprintf(buffer+offset,maxLen-offset, "     |");
		DUMP_HEX_VVLOG
		for (j = 0; j < 16 && (0< (maxLen-offset)); j++) {
			int pos = i + j;
			if (pos > len) {
				break;
			}
			int c = (input[pos] & 0xff);
			if (c >= 32 && c <= 127) {
				offset += snprintf(buffer+offset,maxLen-offset,"%c", c);
				DUMP_HEX_VVLOG
			} else {
				offset += snprintf(buffer+offset,maxLen-offset, ".");
				DUMP_HEX_VVLOG
			}
		}
		for (; j < 16; j++) {
			offset += snprintf(buffer+offset,maxLen-offset, " ");
			DUMP_HEX_VVLOG
		}
		offset += snprintf(buffer+offset,maxLen-offset, "|");
		DUMP_HEX_VVLOG
	}
	return offset;
}