Function BERLengthDecode

src/cryptopp/asn.cpp:38–74

}

bool BERLengthDecode(BufferedTransformation &bt, lword &length, bool &definiteLength)
{
	byte b;

	if (!bt.Get(b))
		return false;

	if (!(b & 0x80))
	{
		definiteLength = true;
		length = b;
	}
	else
	{
		unsigned int lengthBytes = b & 0x7f;

		if (lengthBytes == 0)
		{
			definiteLength = false;
			return true;
		}

		definiteLength = true;
		length = 0;
		while (lengthBytes--)
		{
			if (length >> (8*(sizeof(length)-1)))
				BERDecodeError();	// length about to overflow

			if (!bt.Get(b))
				return false;

			length = (length << 8) | b;
		}
	}
	return true;
}

bool BERLengthDecode(BufferedTransformation &bt, size_t &length)
{