Exemplo n.º 1
0
func (dec *decoder) decode(s string, depth int) interface{} {
	dec.align(alignment(typeFor(s)))
	switch s[0] {
	case 'y':
		var b [1]byte
		if _, err := dec.in.Read(b[:]); err != nil {
			panic(err)
		}
		dec.pos++
		return b[0]
	case 'b':
		i := dec.decode("u", depth).(uint32)
		switch {
		case i == 0:
			return false
		case i == 1:
			return true
		default:
			panic(FormatError("invalid value for boolean"))
		}
	case 'n':
		var i int16
		dec.binread(&i)
		dec.pos += 2
		return i
	case 'i':
		var i int32
		dec.binread(&i)
		dec.pos += 4
		return i
	case 'x':
		var i int64
		dec.binread(&i)
		dec.pos += 8
		return i
	case 'q':
		var i uint16
		dec.binread(&i)
		dec.pos += 2
		return i
	case 'u':
		var i uint32
		dec.binread(&i)
		dec.pos += 4
		return i
	case 't':
		var i uint64
		dec.binread(&i)
		dec.pos += 8
		return i
	case 'd':
		var f float64
		dec.binread(&f)
		dec.pos += 8
		return f
	case 's':
		length := dec.decode("u", depth).(uint32)
		b := make([]byte, int(length)+1)
		if _, err := io.ReadFull(dec.in, b); err != nil {
			panic(err)
		}
		dec.pos += int(length) + 1
		return string(b[:len(b)-1])
	case 'o':
		return dbus.ObjectPath(dec.decode("s", depth).(string))
	case 'g':
		length := dec.decode("y", depth).(byte)
		b := make([]byte, int(length)+1)
		if _, err := io.ReadFull(dec.in, b); err != nil {
			panic(err)
		}
		dec.pos += int(length) + 1
		sig, err := dbus.ParseSignature(string(b[:len(b)-1]))
		if err != nil {
			panic(err)
		}
		return sig
	case 'v':
		if depth >= 64 {
			panic(FormatError("input exceeds container depth limit"))
		}
		var variant dbus.Variant
		sig := dec.decode("g", depth).(dbus.Signature)
		if len(sig.String()) == 0 {
			panic(FormatError("variant signature is empty"))
		}
		err, rem := validSingle(sig.String(), 0)
		if err != nil {
			panic(err)
		}
		if rem != "" {
			panic(FormatError("variant signature has multiple types"))
		}
		//variant.sig = sig
		//variant.value = dec.decode(sig.String(), depth+1)
		variant = dbus.MakeVariant(dec.decode(sig.String(), depth+1))
		return variant
	case 'h':
		return dbus.UnixFDIndex(dec.decode("u", depth).(uint32))
	case 'a':
		if len(s) > 1 && s[1] == '{' {
			ksig := s[2:3]
			vsig := s[3 : len(s)-1]
			v := reflect.MakeMap(reflect.MapOf(typeFor(ksig), typeFor(vsig)))
			if depth >= 63 {
				panic(FormatError("input exceeds container depth limit"))
			}
			length := dec.decode("u", depth).(uint32)
			// Even for empty maps, the correct padding must be included
			dec.align(8)
			spos := dec.pos
			for dec.pos < spos+int(length) {
				dec.align(8)
				if !isKeyType(v.Type().Key()) {
					panic(dbus.InvalidTypeError{v.Type()})
				}
				kv := dec.decode(ksig, depth+2)
				vv := dec.decode(vsig, depth+2)
				v.SetMapIndex(reflect.ValueOf(kv), reflect.ValueOf(vv))
			}
			return v.Interface()
		}
		if depth >= 64 {
			panic(FormatError("input exceeds container depth limit"))
		}
		length := dec.decode("u", depth).(uint32)
		v := reflect.MakeSlice(reflect.SliceOf(typeFor(s[1:])), 0, int(length))
		// Even for empty arrays, the correct padding must be included
		dec.align(alignment(typeFor(s[1:])))
		spos := dec.pos
		for dec.pos < spos+int(length) {
			ev := dec.decode(s[1:], depth+1)
			v = reflect.Append(v, reflect.ValueOf(ev))
		}
		return v.Interface()
	case '(':
		if depth >= 64 {
			panic(FormatError("input exceeds container depth limit"))
		}
		dec.align(8)
		v := make([]interface{}, 0)
		s = s[1 : len(s)-1]
		for s != "" {
			err, rem := validSingle(s, 0)
			if err != nil {
				panic(err)
			}
			ev := dec.decode(s[:len(s)-len(rem)], depth+1)
			v = append(v, ev)
			s = rem
		}
		return v
	default:
		panic(dbus.SignatureError{Sig: s})
	}
}
Exemplo n.º 2
0
	boolType        = reflect.TypeOf(false)
	uint8Type       = reflect.TypeOf(uint8(0))
	int16Type       = reflect.TypeOf(int16(0))
	uint16Type      = reflect.TypeOf(uint16(0))
	int32Type       = reflect.TypeOf(int32(0))
	uint32Type      = reflect.TypeOf(uint32(0))
	int64Type       = reflect.TypeOf(int64(0))
	uint64Type      = reflect.TypeOf(uint64(0))
	float64Type     = reflect.TypeOf(float64(0))
	stringType      = reflect.TypeOf("")
	signatureType   = reflect.TypeOf(dbus.Signature{})
	objectPathType  = reflect.TypeOf(dbus.ObjectPath(""))
	variantType     = reflect.TypeOf(dbus.Variant{})
	interfacesType  = reflect.TypeOf([]interface{}{})
	unixFDType      = reflect.TypeOf(dbus.UnixFD(0))
	unixFDIndexType = reflect.TypeOf(dbus.UnixFDIndex(0))
)

func alignment(t reflect.Type) int {
	switch t {
	case variantType:
		return 1
	case objectPathType:
		return 4
	case signatureType:
		return 1
	case interfacesType: // sometimes used for structs
		return 8
	}
	switch t.Kind() {
	case reflect.Uint8: