Method readField

GPRS/ByteVector.h:343–347

Identical to getField, but add lengthBits to readIndex.

	// Identical to getField, but add lengthBits to readIndex.
	uint64_t readField(size_t& readIndex, unsigned lengthBits) const {
		uint64_t result = getField(readIndex,lengthBits);
		readIndex += lengthBits;
		return result;
	}

	void appendField(uint64_t value,unsigned lengthBits);
	// This works for Field<> data types.