Function PeekValueLength

pkg/util/encoding/encoding.go:3214–3226

PeekValueLength returns the length of the encoded value at the start of b. Note: If this function succeeds, it's not a guarantee that decoding the value will succeed. `b` can point either at beginning of the "full tag" with the column id, or it can point to the beginning of the type part of the tag

(b []byte)

// The length returned is the full length of the encoded value, including the
// entire tag.
func PeekValueLength(b []byte) (typeOffset int, length int, err error) {
	if len(b) == 0 {
		return 0, 0, nil
	}
	var dataOffset int
	var typ Type
	typeOffset, dataOffset, _, typ, err = DecodeValueTag(b)
	if err != nil {
		return 0, 0, err
	}
	length, err = PeekValueLengthWithOffsetsAndType(b, dataOffset, typ)
	return typeOffset, length, err
}

// PeekValueLengthWithOffsetsAndType is the same as PeekValueLength, except it
// expects a dataOffset and typ value from a previous call to DecodeValueTag