decode major7 floats

encoding/cbor/decode.go

@@ -3,6 +3,7 @@ package cbor
 import (
 	"encoding/binary"
 	"fmt"
+	"math"
 )
 
 const minorIndefinite = 31
@@ -254,11 +255,23 @@ func decodeMajor7(p []byte) (Value, int, error) {
 	case major7Undefined:
 		return &Major7Undefined{}, 1, nil
 	case major7Float16:
-		return nil, 0, fmt.Errorf("TODO")
+		if len(p) < 3 {
+			return nil, 0, fmt.Errorf("encoded float16 at end of buffer")
+		}
+		b := binary.BigEndian.Uint16(p[1:])
+		return Major7Float32(math.Float32frombits(float16to32(b))), 3, nil
 	case major7Float32:
-		return nil, 0, fmt.Errorf("TODO")
+		if len(p) < 5 {
+			return nil, 0, fmt.Errorf("encoded float32 at end of buffer")
+		}
+		b := binary.BigEndian.Uint32(p[1:])
+		return Major7Float32(math.Float32frombits(b)), 5, nil
 	case major7Float64:
-		return nil, 0, fmt.Errorf("TODO")
+		if len(p) < 9 {
+			return nil, 0, fmt.Errorf("encoded float64 at end of buffer")
+		}
+		b := binary.BigEndian.Uint64(p[1:])
+		return Major7Float64(math.Float64frombits(b)), 9, nil
 	default:
 		return nil, 0, fmt.Errorf("unexpected minor value %d", m)
 	}