docs: reorder & testing

pkg/transcoder/uuid.go

@@ -0,0 +1,22 @@
+package transcoder
+
+import (
+	"encoding/binary"
+
+	"github.com/google/uuid"
+)
+
+// uuidToHiLo splits a 16-byte UUID into the two big-endian uint64
+// halves used by the FlatBuffers `common.UUID` struct (`hi` carries
+// bytes 0..7, `lo` carries bytes 8..15).
+func uuidToHiLo(value uuid.UUID) (uint64, uint64) {
+	return binary.BigEndian.Uint64(value[0:8]), binary.BigEndian.Uint64(value[8:16])
+}
+
+// uuidFromHiLo reverses uuidToHiLo.
+func uuidFromHiLo(hi, lo uint64) uuid.UUID {
+	var value uuid.UUID
+	binary.BigEndian.PutUint64(value[0:8], hi)
+	binary.BigEndian.PutUint64(value[8:16], lo)
+	return value
+}