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authorMatthew Heon <matthew.heon@gmail.com>2017-11-01 11:24:59 -0400
committerMatthew Heon <matthew.heon@gmail.com>2017-11-01 11:24:59 -0400
commita031b83a09a8628435317a03f199cdc18b78262f (patch)
treebc017a96769ce6de33745b8b0b1304ccf38e9df0 /vendor/github.com/godbus/dbus/encoder.go
parent2b74391cd5281f6fdf391ff8ad50fd1490f6bf89 (diff)
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Initial checkin from CRI-O repo
Signed-off-by: Matthew Heon <matthew.heon@gmail.com>
Diffstat (limited to 'vendor/github.com/godbus/dbus/encoder.go')
-rw-r--r--vendor/github.com/godbus/dbus/encoder.go210
1 files changed, 210 insertions, 0 deletions
diff --git a/vendor/github.com/godbus/dbus/encoder.go b/vendor/github.com/godbus/dbus/encoder.go
new file mode 100644
index 000000000..8bb717761
--- /dev/null
+++ b/vendor/github.com/godbus/dbus/encoder.go
@@ -0,0 +1,210 @@
+package dbus
+
+import (
+ "bytes"
+ "encoding/binary"
+ "io"
+ "reflect"
+)
+
+// An encoder encodes values to the D-Bus wire format.
+type encoder struct {
+ out io.Writer
+ order binary.ByteOrder
+ pos int
+}
+
+// NewEncoder returns a new encoder that writes to out in the given byte order.
+func newEncoder(out io.Writer, order binary.ByteOrder) *encoder {
+ return newEncoderAtOffset(out, 0, order)
+}
+
+// newEncoderAtOffset returns a new encoder that writes to out in the given
+// byte order. Specify the offset to initialize pos for proper alignment
+// computation.
+func newEncoderAtOffset(out io.Writer, offset int, order binary.ByteOrder) *encoder {
+ enc := new(encoder)
+ enc.out = out
+ enc.order = order
+ enc.pos = offset
+ return enc
+}
+
+// Aligns the next output to be on a multiple of n. Panics on write errors.
+func (enc *encoder) align(n int) {
+ pad := enc.padding(0, n)
+ if pad > 0 {
+ empty := make([]byte, pad)
+ if _, err := enc.out.Write(empty); err != nil {
+ panic(err)
+ }
+ enc.pos += pad
+ }
+}
+
+// pad returns the number of bytes of padding, based on current position and additional offset.
+// and alignment.
+func (enc *encoder) padding(offset, algn int) int {
+ abs := enc.pos + offset
+ if abs%algn != 0 {
+ newabs := (abs + algn - 1) & ^(algn - 1)
+ return newabs - abs
+ }
+ return 0
+}
+
+// Calls binary.Write(enc.out, enc.order, v) and panics on write errors.
+func (enc *encoder) binwrite(v interface{}) {
+ if err := binary.Write(enc.out, enc.order, v); err != nil {
+ panic(err)
+ }
+}
+
+// Encode encodes the given values to the underyling reader. All written values
+// are aligned properly as required by the D-Bus spec.
+func (enc *encoder) Encode(vs ...interface{}) (err error) {
+ defer func() {
+ err, _ = recover().(error)
+ }()
+ for _, v := range vs {
+ enc.encode(reflect.ValueOf(v), 0)
+ }
+ return nil
+}
+
+// encode encodes the given value to the writer and panics on error. depth holds
+// the depth of the container nesting.
+func (enc *encoder) encode(v reflect.Value, depth int) {
+ enc.align(alignment(v.Type()))
+ switch v.Kind() {
+ case reflect.Uint8:
+ var b [1]byte
+ b[0] = byte(v.Uint())
+ if _, err := enc.out.Write(b[:]); err != nil {
+ panic(err)
+ }
+ enc.pos++
+ case reflect.Bool:
+ if v.Bool() {
+ enc.encode(reflect.ValueOf(uint32(1)), depth)
+ } else {
+ enc.encode(reflect.ValueOf(uint32(0)), depth)
+ }
+ case reflect.Int16:
+ enc.binwrite(int16(v.Int()))
+ enc.pos += 2
+ case reflect.Uint16:
+ enc.binwrite(uint16(v.Uint()))
+ enc.pos += 2
+ case reflect.Int, reflect.Int32:
+ enc.binwrite(int32(v.Int()))
+ enc.pos += 4
+ case reflect.Uint, reflect.Uint32:
+ enc.binwrite(uint32(v.Uint()))
+ enc.pos += 4
+ case reflect.Int64:
+ enc.binwrite(v.Int())
+ enc.pos += 8
+ case reflect.Uint64:
+ enc.binwrite(v.Uint())
+ enc.pos += 8
+ case reflect.Float64:
+ enc.binwrite(v.Float())
+ enc.pos += 8
+ case reflect.String:
+ enc.encode(reflect.ValueOf(uint32(len(v.String()))), depth)
+ b := make([]byte, v.Len()+1)
+ copy(b, v.String())
+ b[len(b)-1] = 0
+ n, err := enc.out.Write(b)
+ if err != nil {
+ panic(err)
+ }
+ enc.pos += n
+ case reflect.Ptr:
+ enc.encode(v.Elem(), depth)
+ case reflect.Slice, reflect.Array:
+ if depth >= 64 {
+ panic(FormatError("input exceeds container depth limit"))
+ }
+ // Lookahead offset: 4 bytes for uint32 length (with alignment),
+ // plus alignment for elements.
+ n := enc.padding(0, 4) + 4
+ offset := enc.pos + n + enc.padding(n, alignment(v.Type().Elem()))
+
+ var buf bytes.Buffer
+ bufenc := newEncoderAtOffset(&buf, offset, enc.order)
+
+ for i := 0; i < v.Len(); i++ {
+ bufenc.encode(v.Index(i), depth+1)
+ }
+ enc.encode(reflect.ValueOf(uint32(buf.Len())), depth)
+ length := buf.Len()
+ enc.align(alignment(v.Type().Elem()))
+ if _, err := buf.WriteTo(enc.out); err != nil {
+ panic(err)
+ }
+ enc.pos += length
+ case reflect.Struct:
+ if depth >= 64 && v.Type() != signatureType {
+ panic(FormatError("input exceeds container depth limit"))
+ }
+ switch t := v.Type(); t {
+ case signatureType:
+ str := v.Field(0)
+ enc.encode(reflect.ValueOf(byte(str.Len())), depth+1)
+ b := make([]byte, str.Len()+1)
+ copy(b, str.String())
+ b[len(b)-1] = 0
+ n, err := enc.out.Write(b)
+ if err != nil {
+ panic(err)
+ }
+ enc.pos += n
+ case variantType:
+ variant := v.Interface().(Variant)
+ enc.encode(reflect.ValueOf(variant.sig), depth+1)
+ enc.encode(reflect.ValueOf(variant.value), depth+1)
+ default:
+ for i := 0; i < v.Type().NumField(); i++ {
+ field := t.Field(i)
+ if field.PkgPath == "" && field.Tag.Get("dbus") != "-" {
+ enc.encode(v.Field(i), depth+1)
+ }
+ }
+ }
+ case reflect.Map:
+ // Maps are arrays of structures, so they actually increase the depth by
+ // 2.
+ if depth >= 63 {
+ panic(FormatError("input exceeds container depth limit"))
+ }
+ if !isKeyType(v.Type().Key()) {
+ panic(InvalidTypeError{v.Type()})
+ }
+ keys := v.MapKeys()
+ // Lookahead offset: 4 bytes for uint32 length (with alignment),
+ // plus 8-byte alignment
+ n := enc.padding(0, 4) + 4
+ offset := enc.pos + n + enc.padding(n, 8)
+
+ var buf bytes.Buffer
+ bufenc := newEncoderAtOffset(&buf, offset, enc.order)
+ for _, k := range keys {
+ bufenc.align(8)
+ bufenc.encode(k, depth+2)
+ bufenc.encode(v.MapIndex(k), depth+2)
+ }
+ enc.encode(reflect.ValueOf(uint32(buf.Len())), depth)
+ length := buf.Len()
+ enc.align(8)
+ if _, err := buf.WriteTo(enc.out); err != nil {
+ panic(err)
+ }
+ enc.pos += length
+ case reflect.Interface:
+ enc.encode(reflect.ValueOf(MakeVariant(v.Interface())), depth)
+ default:
+ panic(InvalidTypeError{v.Type()})
+ }
+}