encodingbridge

var (
	// WriteHeaderVersion writes a 9-byte header declaring version v.
	WriteHeaderVersion func(w io.Writer, v byte) error

	// WriteSchemaVersion writes s's schema block in version v's layout
	// (the 0x02 extension block included).
	WriteSchemaVersion func(w io.Writer, s any, v byte) error

	// ValidateGroupShape is Schema.ValidateGroups without the group
	// dictionary checks.
	ValidateGroupShape func(s any) error

	// MemberSets returns, per logical field, the owning group (or -1)
	// and the member slot within it.
	MemberSets func(s any) (groupOf, slotOf []int)

	// GroupEntryGeometry returns group g's entry width and the offset of
	// the member null bitmap within an entry (-1 when no member is
	// nullable).
	GroupEntryGeometry func(s any, g int) (width, bmOff int)

	// GroupDescriptorBytes is the on-wire size of one group's descriptor
	// in the 0x02 groups section, for a group of the given member count.
	GroupDescriptorBytes func(members int) int

	// ReadSchemaLayout is ReadSchema without the dictionaries: every
	// categorical / set dictionary and group entry table is read past,
	// never allocated, leaving r at the first record byte. Returns a
	// *encoding.Schema with nil Dictionary / Entries.
	ReadSchemaLayout func(r io.Reader, v byte) (any, error)
)