Function BytesToString

src/utils/xstring.cpp:206–258

Converts the provided data to a string in a standard, user-friendly, round-trippable format

///Converts the provided data to a string in a standard, user-friendly, round-trippable format
std::string BytesToString(const void* data, int len)
{
	char temp[16];
	if(len==1) {
		sprintf(temp,"%d",*(const unsigned char*)data);
		return temp;
	} else if(len==2) {
		sprintf(temp,"%d",*(const unsigned short*)data);
		return temp;
	} else if(len==4) {
		sprintf(temp,"%d",*(const unsigned int*)data);
		return temp;		
	}
	
	std::string ret;
	if(1) // use base64
	{
		const unsigned char* src = (const unsigned char*)data;
		ret = "base64:";
		for(int n; len > 0; len -= n)
		{
			unsigned char input[3] = {0,0,0};
			for(n=0; n<3 && n<len; ++n)
				input[n] = *src++;
			unsigned char output[4] =
			{
				Base64Table[ input[0] >> 2 ],
				Base64Table[ ((input[0] & 0x03) << 4) | (input[1] >> 4) ],
				static_cast<unsigned char> (n<2 ? '=' : Base64Table[ ((input[1] & 0x0F) << 2) | (input[2] >> 6) ]),
				static_cast<unsigned char> (n<3 ? '=' : Base64Table[ input[2] & 0x3F ])
			};
			ret.append(output, output+4);
		}
	}
	else // use hex
	{
		ret.resize(len*2+2);
		ret[0] = '0';
		ret[1] = 'x';
		for(int i=0;i<len;i++)
		{
			int a = (((const unsigned char*)data)[i]>>4);
			int b = (((const unsigned char*)data)[i])&15;
			if(a>9) a += 'A'-10;
			else a += '0';
			if(b>9) b += 'A'-10;
			else b += '0';
			ret[2+i*2] = a;
			ret[2+i*2+1] = b;
		}
	}
	return ret;
}

///returns -1 if this is not a hex string
int HexStringToBytesLength(const std::string& str)