11
order binary.ByteOrder
15
// newDecoder returns a new decoder that reads values from in. The input is
16
// expected to be in the given byte order.
17
func newDecoder(in io.Reader, order binary.ByteOrder) *decoder {
24
// align aligns the input to the given boundary and panics on error.
25
func (dec *decoder) align(n int) {
27
newpos := (dec.pos + n - 1) & ^(n - 1)
28
empty := make([]byte, newpos-dec.pos)
29
if _, err := io.ReadFull(dec.in, empty); err != nil {
36
// Calls binary.Read(dec.in, dec.order, v) and panics on read errors.
37
func (dec *decoder) binread(v interface{}) {
38
if err := binary.Read(dec.in, dec.order, v); err != nil {
43
func (dec *decoder) Decode(sig Signature) (vs []interface{}, err error) {
47
if err, ok = v.(error); ok {
48
if err == io.EOF || err == io.ErrUnexpectedEOF {
49
err = FormatError("unexpected EOF")
53
vs = make([]interface{}, 0)
56
err, rem := validSingle(s, 0)
60
v := dec.decode(s[:len(s)-len(rem)], 0)
67
func (dec *decoder) decode(s string, depth int) interface{} {
68
dec.align(alignment(typeFor(s)))
72
if _, err := dec.in.Read(b[:]); err != nil {
78
i := dec.decode("u", depth).(uint32)
85
panic(FormatError("invalid value for boolean"))
123
length := dec.decode("u", depth).(uint32)
124
b := make([]byte, int(length)+1)
125
if _, err := io.ReadFull(dec.in, b); err != nil {
128
dec.pos += int(length) + 1
129
return string(b[:len(b)-1])
131
return ObjectPath(dec.decode("s", depth).(string))
133
length := dec.decode("y", depth).(byte)
134
b := make([]byte, int(length)+1)
135
if _, err := io.ReadFull(dec.in, b); err != nil {
138
dec.pos += int(length) + 1
139
sig, err := ParseSignature(string(b[:len(b)-1]))
146
panic(FormatError("input exceeds container depth limit"))
149
sig := dec.decode("g", depth).(Signature)
150
if len(sig.str) == 0 {
151
panic(FormatError("variant signature is empty"))
153
err, rem := validSingle(sig.str, 0)
158
panic(FormatError("variant signature has multiple types"))
161
variant.value = dec.decode(sig.str, depth+1)
164
return UnixFDIndex(dec.decode("u", depth).(uint32))
166
if len(s) > 1 && s[1] == '{' {
168
vsig := s[3 : len(s)-1]
169
v := reflect.MakeMap(reflect.MapOf(typeFor(ksig), typeFor(vsig)))
171
panic(FormatError("input exceeds container depth limit"))
173
length := dec.decode("u", depth).(uint32)
174
// Even for empty maps, the correct padding must be included
177
for dec.pos < spos+int(length) {
179
if !isKeyType(v.Type().Key()) {
180
panic(InvalidTypeError{v.Type()})
182
kv := dec.decode(ksig, depth+2)
183
vv := dec.decode(vsig, depth+2)
184
v.SetMapIndex(reflect.ValueOf(kv), reflect.ValueOf(vv))
189
panic(FormatError("input exceeds container depth limit"))
191
length := dec.decode("u", depth).(uint32)
192
v := reflect.MakeSlice(reflect.SliceOf(typeFor(s[1:])), 0, int(length))
193
// Even for empty arrays, the correct padding must be included
194
dec.align(alignment(typeFor(s[1:])))
196
for dec.pos < spos+int(length) {
197
ev := dec.decode(s[1:], depth+1)
198
v = reflect.Append(v, reflect.ValueOf(ev))
203
panic(FormatError("input exceeds container depth limit"))
206
v := make([]interface{}, 0)
209
err, rem := validSingle(s, 0)
213
ev := dec.decode(s[:len(s)-len(rem)], depth+1)
219
panic(SignatureError{Sig: s})
223
// A FormatError is an error in the wire format.
224
type FormatError string
226
func (e FormatError) Error() string {
227
return "dbus: wire format error: " + string(e)