encoding/binary: add complex

R=rsc
CC=golang-dev
https://golang.org/cl/1879043

src/pkg/encoding/binary/binary.go

@@ -115,11 +115,11 @@ func (bigEndian) GoString() string { return "binary.BigEndian" }
 // Read reads structured binary data from r into data.
 // Data must be a pointer to a fixed-size value or a slice
 // of fixed-size values.
-// A fixed-size value is either a fixed-size integer
-// (int8, uint8, int16, uint16, ...) or an array or struct
-// containing only fixed-size values.  Bytes read from
-// r are decoded using the specified byte order and written
-// to successive fields of the data.
+// A fixed-size value is either a fixed-size arithmetic
+// type (int8, uint8, int16, float32, complex64, ...)
+// or an array or struct containing only fixed-size values.
+// Bytes read from r are decoded using the specified byte order
+// and written to successive fields of the data.
 func Read(r io.Reader, order ByteOrder, data interface{}) os.Error {
 	var v reflect.Value
 	switch d := reflect.NewValue(data).(type) {
@@ -145,11 +145,11 @@ func Read(r io.Reader, order ByteOrder, data interface{}) os.Error {
 // Write writes the binary representation of data into w.
 // Data must be a fixed-size value or a pointer to
 // a fixed-size value.
-// A fixed-size value is either a fixed-size integer
-// (int8, uint8, int16, uint16, ...) or an array or struct
-// containing only fixed-size values.  Bytes written to
-// w are encoded using the specified byte order and read
-// from successive fields of the data.
+// A fixed-size value is either a fixed-size arithmetic
+// type (int8, uint8, int16, float32, complex64, ...)
+// or an array or struct containing only fixed-size values.
+// Bytes written to w are encoded using the specified byte order
+// and read from successive fields of the data.
 func Write(w io.Writer, order ByteOrder, data interface{}) os.Error {
 	v := reflect.Indirect(reflect.NewValue(data))
 	size := TotalSize(v)
@@ -194,7 +194,7 @@ func sizeof(v reflect.Type) int {
 		}
 		return sum
 
-	case *reflect.UintType, *reflect.IntType, *reflect.FloatType:
+	case *reflect.UintType, *reflect.IntType, *reflect.FloatType, *reflect.ComplexType:
 		return int(v.Size())
 	}
 	return -1
@@ -320,6 +320,20 @@ func (d *decoder) value(v reflect.Value) {
 		case reflect.Float64:
 			v.Set(math.Float64frombits(d.uint64()))
 		}
+
+	case *reflect.ComplexValue:
+		switch v.Type().Kind() {
+		case reflect.Complex64:
+			v.Set(cmplx(
+				float64(math.Float32frombits(d.uint32())),
+				float64(math.Float32frombits(d.uint32())),
+			))
+		case reflect.Complex128:
+			v.Set(cmplx(
+				math.Float64frombits(d.uint64()),
+				math.Float64frombits(d.uint64()),
+			))
+		}
 	}
 }
 
@@ -372,5 +386,17 @@ func (e *encoder) value(v reflect.Value) {
 		case reflect.Float64:
 			e.uint64(math.Float64bits(v.Get()))
 		}
+
+	case *reflect.ComplexValue:
+		switch v.Type().Kind() {
+		case reflect.Complex64:
+			x := v.Get()
+			e.uint32(math.Float32bits(float32(real(x))))
+			e.uint32(math.Float32bits(float32(imag(x))))
+		case reflect.Complex128:
+			x := v.Get()
+			e.uint64(math.Float64bits(real(x)))
+			e.uint64(math.Float64bits(imag(x)))
+		}
 	}
 }

src/pkg/encoding/binary/binary_test.go

@@ -21,7 +21,10 @@ type Struct struct {
 	Uint16     uint16
 	Uint32     uint32
 	Uint64     uint64
+	Float32    float32
 	Float64    float64
+	Complex64  complex64
+	Complex128 complex128
 	Array      [4]uint8
 }
 
@@ -34,8 +37,19 @@ var s = Struct{
 	0x1112,
 	0x13141516,
 	0x1718191a1b1c1d1e,
-	math.Float64frombits(0x1f20212223242526),
-	[4]uint8{0x27, 0x28, 0x29, 0x2a},
+
+	math.Float32frombits(0x1f202122),
+	math.Float64frombits(0x232425262728292a),
+	cmplx(
+		math.Float32frombits(0x2b2c2d2e),
+		math.Float32frombits(0x2f303132),
+	),
+	cmplx(
+		math.Float64frombits(0x333435363738393a),
+		math.Float64frombits(0x3b3c3d3e3f404142),
+	),
+
+	[4]uint8{0x43, 0x44, 0x45, 0x46},
 }
 
 var big = []byte{
@@ -47,8 +61,13 @@ var big = []byte{
 	17, 18,
 	19, 20, 21, 22,
 	23, 24, 25, 26, 27, 28, 29, 30,
-	31, 32, 33, 34, 35, 36, 37, 38,
-	39, 40, 41, 42,
+
+	31, 32, 33, 34,
+	35, 36, 37, 38, 39, 40, 41, 42,
+	43, 44, 45, 46, 47, 48, 49, 50,
+	51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66,
+
+	67, 68, 69, 70,
 }
 
 var little = []byte{
@@ -60,8 +79,13 @@ var little = []byte{
 	18, 17,
 	22, 21, 20, 19,
 	30, 29, 28, 27, 26, 25, 24, 23,
-	38, 37, 36, 35, 34, 33, 32, 31,
-	39, 40, 41, 42,
+
+	34, 33, 32, 31,
+	42, 41, 40, 39, 38, 37, 36, 35,
+	46, 45, 44, 43, 50, 49, 48, 47,
+	58, 57, 56, 55, 54, 53, 52, 51, 66, 65, 64, 63, 62, 61, 60, 59,
+
+	67, 68, 69, 70,
 }
 
 var src = []byte{1, 2, 3, 4, 5, 6, 7, 8}