[VOL-4291] OfAgent changes for gRPC migration
Change-Id: I8da1db6df49d478ef24ec8f9bd719e9692f48a7f
diff --git a/vendor/google.golang.org/protobuf/encoding/prototext/decode.go b/vendor/google.golang.org/protobuf/encoding/prototext/decode.go
new file mode 100644
index 0000000..179d6e8
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/encoding/prototext/decode.go
@@ -0,0 +1,770 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package prototext
+
+import (
+ "fmt"
+ "unicode/utf8"
+
+ "google.golang.org/protobuf/internal/encoding/messageset"
+ "google.golang.org/protobuf/internal/encoding/text"
+ "google.golang.org/protobuf/internal/errors"
+ "google.golang.org/protobuf/internal/flags"
+ "google.golang.org/protobuf/internal/genid"
+ "google.golang.org/protobuf/internal/pragma"
+ "google.golang.org/protobuf/internal/set"
+ "google.golang.org/protobuf/internal/strs"
+ "google.golang.org/protobuf/proto"
+ pref "google.golang.org/protobuf/reflect/protoreflect"
+ "google.golang.org/protobuf/reflect/protoregistry"
+)
+
+// Unmarshal reads the given []byte into the given proto.Message.
+// The provided message must be mutable (e.g., a non-nil pointer to a message).
+func Unmarshal(b []byte, m proto.Message) error {
+ return UnmarshalOptions{}.Unmarshal(b, m)
+}
+
+// UnmarshalOptions is a configurable textproto format unmarshaler.
+type UnmarshalOptions struct {
+ pragma.NoUnkeyedLiterals
+
+ // AllowPartial accepts input for messages that will result in missing
+ // required fields. If AllowPartial is false (the default), Unmarshal will
+ // return error if there are any missing required fields.
+ AllowPartial bool
+
+ // DiscardUnknown specifies whether to ignore unknown fields when parsing.
+ // An unknown field is any field whose field name or field number does not
+ // resolve to any known or extension field in the message.
+ // By default, unmarshal rejects unknown fields as an error.
+ DiscardUnknown bool
+
+ // Resolver is used for looking up types when unmarshaling
+ // google.protobuf.Any messages or extension fields.
+ // If nil, this defaults to using protoregistry.GlobalTypes.
+ Resolver interface {
+ protoregistry.MessageTypeResolver
+ protoregistry.ExtensionTypeResolver
+ }
+}
+
+// Unmarshal reads the given []byte and populates the given proto.Message
+// using options in the UnmarshalOptions object.
+// The provided message must be mutable (e.g., a non-nil pointer to a message).
+func (o UnmarshalOptions) Unmarshal(b []byte, m proto.Message) error {
+ return o.unmarshal(b, m)
+}
+
+// unmarshal is a centralized function that all unmarshal operations go through.
+// For profiling purposes, avoid changing the name of this function or
+// introducing other code paths for unmarshal that do not go through this.
+func (o UnmarshalOptions) unmarshal(b []byte, m proto.Message) error {
+ proto.Reset(m)
+
+ if o.Resolver == nil {
+ o.Resolver = protoregistry.GlobalTypes
+ }
+
+ dec := decoder{text.NewDecoder(b), o}
+ if err := dec.unmarshalMessage(m.ProtoReflect(), false); err != nil {
+ return err
+ }
+ if o.AllowPartial {
+ return nil
+ }
+ return proto.CheckInitialized(m)
+}
+
+type decoder struct {
+ *text.Decoder
+ opts UnmarshalOptions
+}
+
+// newError returns an error object with position info.
+func (d decoder) newError(pos int, f string, x ...interface{}) error {
+ line, column := d.Position(pos)
+ head := fmt.Sprintf("(line %d:%d): ", line, column)
+ return errors.New(head+f, x...)
+}
+
+// unexpectedTokenError returns a syntax error for the given unexpected token.
+func (d decoder) unexpectedTokenError(tok text.Token) error {
+ return d.syntaxError(tok.Pos(), "unexpected token: %s", tok.RawString())
+}
+
+// syntaxError returns a syntax error for given position.
+func (d decoder) syntaxError(pos int, f string, x ...interface{}) error {
+ line, column := d.Position(pos)
+ head := fmt.Sprintf("syntax error (line %d:%d): ", line, column)
+ return errors.New(head+f, x...)
+}
+
+// unmarshalMessage unmarshals into the given protoreflect.Message.
+func (d decoder) unmarshalMessage(m pref.Message, checkDelims bool) error {
+ messageDesc := m.Descriptor()
+ if !flags.ProtoLegacy && messageset.IsMessageSet(messageDesc) {
+ return errors.New("no support for proto1 MessageSets")
+ }
+
+ if messageDesc.FullName() == genid.Any_message_fullname {
+ return d.unmarshalAny(m, checkDelims)
+ }
+
+ if checkDelims {
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+
+ if tok.Kind() != text.MessageOpen {
+ return d.unexpectedTokenError(tok)
+ }
+ }
+
+ var seenNums set.Ints
+ var seenOneofs set.Ints
+ fieldDescs := messageDesc.Fields()
+
+ for {
+ // Read field name.
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+ switch typ := tok.Kind(); typ {
+ case text.Name:
+ // Continue below.
+ case text.EOF:
+ if checkDelims {
+ return text.ErrUnexpectedEOF
+ }
+ return nil
+ default:
+ if checkDelims && typ == text.MessageClose {
+ return nil
+ }
+ return d.unexpectedTokenError(tok)
+ }
+
+ // Resolve the field descriptor.
+ var name pref.Name
+ var fd pref.FieldDescriptor
+ var xt pref.ExtensionType
+ var xtErr error
+ var isFieldNumberName bool
+
+ switch tok.NameKind() {
+ case text.IdentName:
+ name = pref.Name(tok.IdentName())
+ fd = fieldDescs.ByTextName(string(name))
+
+ case text.TypeName:
+ // Handle extensions only. This code path is not for Any.
+ xt, xtErr = d.opts.Resolver.FindExtensionByName(pref.FullName(tok.TypeName()))
+
+ case text.FieldNumber:
+ isFieldNumberName = true
+ num := pref.FieldNumber(tok.FieldNumber())
+ if !num.IsValid() {
+ return d.newError(tok.Pos(), "invalid field number: %d", num)
+ }
+ fd = fieldDescs.ByNumber(num)
+ if fd == nil {
+ xt, xtErr = d.opts.Resolver.FindExtensionByNumber(messageDesc.FullName(), num)
+ }
+ }
+
+ if xt != nil {
+ fd = xt.TypeDescriptor()
+ if !messageDesc.ExtensionRanges().Has(fd.Number()) || fd.ContainingMessage().FullName() != messageDesc.FullName() {
+ return d.newError(tok.Pos(), "message %v cannot be extended by %v", messageDesc.FullName(), fd.FullName())
+ }
+ } else if xtErr != nil && xtErr != protoregistry.NotFound {
+ return d.newError(tok.Pos(), "unable to resolve [%s]: %v", tok.RawString(), xtErr)
+ }
+ if flags.ProtoLegacy {
+ if fd != nil && fd.IsWeak() && fd.Message().IsPlaceholder() {
+ fd = nil // reset since the weak reference is not linked in
+ }
+ }
+
+ // Handle unknown fields.
+ if fd == nil {
+ if d.opts.DiscardUnknown || messageDesc.ReservedNames().Has(name) {
+ d.skipValue()
+ continue
+ }
+ return d.newError(tok.Pos(), "unknown field: %v", tok.RawString())
+ }
+
+ // Handle fields identified by field number.
+ if isFieldNumberName {
+ // TODO: Add an option to permit parsing field numbers.
+ //
+ // This requires careful thought as the MarshalOptions.EmitUnknown
+ // option allows formatting unknown fields as the field number and the
+ // best-effort textual representation of the field value. In that case,
+ // it may not be possible to unmarshal the value from a parser that does
+ // have information about the unknown field.
+ return d.newError(tok.Pos(), "cannot specify field by number: %v", tok.RawString())
+ }
+
+ switch {
+ case fd.IsList():
+ kind := fd.Kind()
+ if kind != pref.MessageKind && kind != pref.GroupKind && !tok.HasSeparator() {
+ return d.syntaxError(tok.Pos(), "missing field separator :")
+ }
+
+ list := m.Mutable(fd).List()
+ if err := d.unmarshalList(fd, list); err != nil {
+ return err
+ }
+
+ case fd.IsMap():
+ mmap := m.Mutable(fd).Map()
+ if err := d.unmarshalMap(fd, mmap); err != nil {
+ return err
+ }
+
+ default:
+ kind := fd.Kind()
+ if kind != pref.MessageKind && kind != pref.GroupKind && !tok.HasSeparator() {
+ return d.syntaxError(tok.Pos(), "missing field separator :")
+ }
+
+ // If field is a oneof, check if it has already been set.
+ if od := fd.ContainingOneof(); od != nil {
+ idx := uint64(od.Index())
+ if seenOneofs.Has(idx) {
+ return d.newError(tok.Pos(), "error parsing %q, oneof %v is already set", tok.RawString(), od.FullName())
+ }
+ seenOneofs.Set(idx)
+ }
+
+ num := uint64(fd.Number())
+ if seenNums.Has(num) {
+ return d.newError(tok.Pos(), "non-repeated field %q is repeated", tok.RawString())
+ }
+
+ if err := d.unmarshalSingular(fd, m); err != nil {
+ return err
+ }
+ seenNums.Set(num)
+ }
+ }
+
+ return nil
+}
+
+// unmarshalSingular unmarshals a non-repeated field value specified by the
+// given FieldDescriptor.
+func (d decoder) unmarshalSingular(fd pref.FieldDescriptor, m pref.Message) error {
+ var val pref.Value
+ var err error
+ switch fd.Kind() {
+ case pref.MessageKind, pref.GroupKind:
+ val = m.NewField(fd)
+ err = d.unmarshalMessage(val.Message(), true)
+ default:
+ val, err = d.unmarshalScalar(fd)
+ }
+ if err == nil {
+ m.Set(fd, val)
+ }
+ return err
+}
+
+// unmarshalScalar unmarshals a scalar/enum protoreflect.Value specified by the
+// given FieldDescriptor.
+func (d decoder) unmarshalScalar(fd pref.FieldDescriptor) (pref.Value, error) {
+ tok, err := d.Read()
+ if err != nil {
+ return pref.Value{}, err
+ }
+
+ if tok.Kind() != text.Scalar {
+ return pref.Value{}, d.unexpectedTokenError(tok)
+ }
+
+ kind := fd.Kind()
+ switch kind {
+ case pref.BoolKind:
+ if b, ok := tok.Bool(); ok {
+ return pref.ValueOfBool(b), nil
+ }
+
+ case pref.Int32Kind, pref.Sint32Kind, pref.Sfixed32Kind:
+ if n, ok := tok.Int32(); ok {
+ return pref.ValueOfInt32(n), nil
+ }
+
+ case pref.Int64Kind, pref.Sint64Kind, pref.Sfixed64Kind:
+ if n, ok := tok.Int64(); ok {
+ return pref.ValueOfInt64(n), nil
+ }
+
+ case pref.Uint32Kind, pref.Fixed32Kind:
+ if n, ok := tok.Uint32(); ok {
+ return pref.ValueOfUint32(n), nil
+ }
+
+ case pref.Uint64Kind, pref.Fixed64Kind:
+ if n, ok := tok.Uint64(); ok {
+ return pref.ValueOfUint64(n), nil
+ }
+
+ case pref.FloatKind:
+ if n, ok := tok.Float32(); ok {
+ return pref.ValueOfFloat32(n), nil
+ }
+
+ case pref.DoubleKind:
+ if n, ok := tok.Float64(); ok {
+ return pref.ValueOfFloat64(n), nil
+ }
+
+ case pref.StringKind:
+ if s, ok := tok.String(); ok {
+ if strs.EnforceUTF8(fd) && !utf8.ValidString(s) {
+ return pref.Value{}, d.newError(tok.Pos(), "contains invalid UTF-8")
+ }
+ return pref.ValueOfString(s), nil
+ }
+
+ case pref.BytesKind:
+ if b, ok := tok.String(); ok {
+ return pref.ValueOfBytes([]byte(b)), nil
+ }
+
+ case pref.EnumKind:
+ if lit, ok := tok.Enum(); ok {
+ // Lookup EnumNumber based on name.
+ if enumVal := fd.Enum().Values().ByName(pref.Name(lit)); enumVal != nil {
+ return pref.ValueOfEnum(enumVal.Number()), nil
+ }
+ }
+ if num, ok := tok.Int32(); ok {
+ return pref.ValueOfEnum(pref.EnumNumber(num)), nil
+ }
+
+ default:
+ panic(fmt.Sprintf("invalid scalar kind %v", kind))
+ }
+
+ return pref.Value{}, d.newError(tok.Pos(), "invalid value for %v type: %v", kind, tok.RawString())
+}
+
+// unmarshalList unmarshals into given protoreflect.List. A list value can
+// either be in [] syntax or simply just a single scalar/message value.
+func (d decoder) unmarshalList(fd pref.FieldDescriptor, list pref.List) error {
+ tok, err := d.Peek()
+ if err != nil {
+ return err
+ }
+
+ switch fd.Kind() {
+ case pref.MessageKind, pref.GroupKind:
+ switch tok.Kind() {
+ case text.ListOpen:
+ d.Read()
+ for {
+ tok, err := d.Peek()
+ if err != nil {
+ return err
+ }
+
+ switch tok.Kind() {
+ case text.ListClose:
+ d.Read()
+ return nil
+ case text.MessageOpen:
+ pval := list.NewElement()
+ if err := d.unmarshalMessage(pval.Message(), true); err != nil {
+ return err
+ }
+ list.Append(pval)
+ default:
+ return d.unexpectedTokenError(tok)
+ }
+ }
+
+ case text.MessageOpen:
+ pval := list.NewElement()
+ if err := d.unmarshalMessage(pval.Message(), true); err != nil {
+ return err
+ }
+ list.Append(pval)
+ return nil
+ }
+
+ default:
+ switch tok.Kind() {
+ case text.ListOpen:
+ d.Read()
+ for {
+ tok, err := d.Peek()
+ if err != nil {
+ return err
+ }
+
+ switch tok.Kind() {
+ case text.ListClose:
+ d.Read()
+ return nil
+ case text.Scalar:
+ pval, err := d.unmarshalScalar(fd)
+ if err != nil {
+ return err
+ }
+ list.Append(pval)
+ default:
+ return d.unexpectedTokenError(tok)
+ }
+ }
+
+ case text.Scalar:
+ pval, err := d.unmarshalScalar(fd)
+ if err != nil {
+ return err
+ }
+ list.Append(pval)
+ return nil
+ }
+ }
+
+ return d.unexpectedTokenError(tok)
+}
+
+// unmarshalMap unmarshals into given protoreflect.Map. A map value is a
+// textproto message containing {key: <kvalue>, value: <mvalue>}.
+func (d decoder) unmarshalMap(fd pref.FieldDescriptor, mmap pref.Map) error {
+ // Determine ahead whether map entry is a scalar type or a message type in
+ // order to call the appropriate unmarshalMapValue func inside
+ // unmarshalMapEntry.
+ var unmarshalMapValue func() (pref.Value, error)
+ switch fd.MapValue().Kind() {
+ case pref.MessageKind, pref.GroupKind:
+ unmarshalMapValue = func() (pref.Value, error) {
+ pval := mmap.NewValue()
+ if err := d.unmarshalMessage(pval.Message(), true); err != nil {
+ return pref.Value{}, err
+ }
+ return pval, nil
+ }
+ default:
+ unmarshalMapValue = func() (pref.Value, error) {
+ return d.unmarshalScalar(fd.MapValue())
+ }
+ }
+
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+ switch tok.Kind() {
+ case text.MessageOpen:
+ return d.unmarshalMapEntry(fd, mmap, unmarshalMapValue)
+
+ case text.ListOpen:
+ for {
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+ switch tok.Kind() {
+ case text.ListClose:
+ return nil
+ case text.MessageOpen:
+ if err := d.unmarshalMapEntry(fd, mmap, unmarshalMapValue); err != nil {
+ return err
+ }
+ default:
+ return d.unexpectedTokenError(tok)
+ }
+ }
+
+ default:
+ return d.unexpectedTokenError(tok)
+ }
+}
+
+// unmarshalMap unmarshals into given protoreflect.Map. A map value is a
+// textproto message containing {key: <kvalue>, value: <mvalue>}.
+func (d decoder) unmarshalMapEntry(fd pref.FieldDescriptor, mmap pref.Map, unmarshalMapValue func() (pref.Value, error)) error {
+ var key pref.MapKey
+ var pval pref.Value
+Loop:
+ for {
+ // Read field name.
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+ switch tok.Kind() {
+ case text.Name:
+ if tok.NameKind() != text.IdentName {
+ if !d.opts.DiscardUnknown {
+ return d.newError(tok.Pos(), "unknown map entry field %q", tok.RawString())
+ }
+ d.skipValue()
+ continue Loop
+ }
+ // Continue below.
+ case text.MessageClose:
+ break Loop
+ default:
+ return d.unexpectedTokenError(tok)
+ }
+
+ switch name := pref.Name(tok.IdentName()); name {
+ case genid.MapEntry_Key_field_name:
+ if !tok.HasSeparator() {
+ return d.syntaxError(tok.Pos(), "missing field separator :")
+ }
+ if key.IsValid() {
+ return d.newError(tok.Pos(), "map entry %q cannot be repeated", name)
+ }
+ val, err := d.unmarshalScalar(fd.MapKey())
+ if err != nil {
+ return err
+ }
+ key = val.MapKey()
+
+ case genid.MapEntry_Value_field_name:
+ if kind := fd.MapValue().Kind(); (kind != pref.MessageKind) && (kind != pref.GroupKind) {
+ if !tok.HasSeparator() {
+ return d.syntaxError(tok.Pos(), "missing field separator :")
+ }
+ }
+ if pval.IsValid() {
+ return d.newError(tok.Pos(), "map entry %q cannot be repeated", name)
+ }
+ pval, err = unmarshalMapValue()
+ if err != nil {
+ return err
+ }
+
+ default:
+ if !d.opts.DiscardUnknown {
+ return d.newError(tok.Pos(), "unknown map entry field %q", name)
+ }
+ d.skipValue()
+ }
+ }
+
+ if !key.IsValid() {
+ key = fd.MapKey().Default().MapKey()
+ }
+ if !pval.IsValid() {
+ switch fd.MapValue().Kind() {
+ case pref.MessageKind, pref.GroupKind:
+ // If value field is not set for message/group types, construct an
+ // empty one as default.
+ pval = mmap.NewValue()
+ default:
+ pval = fd.MapValue().Default()
+ }
+ }
+ mmap.Set(key, pval)
+ return nil
+}
+
+// unmarshalAny unmarshals an Any textproto. It can either be in expanded form
+// or non-expanded form.
+func (d decoder) unmarshalAny(m pref.Message, checkDelims bool) error {
+ var typeURL string
+ var bValue []byte
+ var seenTypeUrl bool
+ var seenValue bool
+ var isExpanded bool
+
+ if checkDelims {
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+
+ if tok.Kind() != text.MessageOpen {
+ return d.unexpectedTokenError(tok)
+ }
+ }
+
+Loop:
+ for {
+ // Read field name. Can only have 3 possible field names, i.e. type_url,
+ // value and type URL name inside [].
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+ if typ := tok.Kind(); typ != text.Name {
+ if checkDelims {
+ if typ == text.MessageClose {
+ break Loop
+ }
+ } else if typ == text.EOF {
+ break Loop
+ }
+ return d.unexpectedTokenError(tok)
+ }
+
+ switch tok.NameKind() {
+ case text.IdentName:
+ // Both type_url and value fields require field separator :.
+ if !tok.HasSeparator() {
+ return d.syntaxError(tok.Pos(), "missing field separator :")
+ }
+
+ switch name := pref.Name(tok.IdentName()); name {
+ case genid.Any_TypeUrl_field_name:
+ if seenTypeUrl {
+ return d.newError(tok.Pos(), "duplicate %v field", genid.Any_TypeUrl_field_fullname)
+ }
+ if isExpanded {
+ return d.newError(tok.Pos(), "conflict with [%s] field", typeURL)
+ }
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+ var ok bool
+ typeURL, ok = tok.String()
+ if !ok {
+ return d.newError(tok.Pos(), "invalid %v field value: %v", genid.Any_TypeUrl_field_fullname, tok.RawString())
+ }
+ seenTypeUrl = true
+
+ case genid.Any_Value_field_name:
+ if seenValue {
+ return d.newError(tok.Pos(), "duplicate %v field", genid.Any_Value_field_fullname)
+ }
+ if isExpanded {
+ return d.newError(tok.Pos(), "conflict with [%s] field", typeURL)
+ }
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+ s, ok := tok.String()
+ if !ok {
+ return d.newError(tok.Pos(), "invalid %v field value: %v", genid.Any_Value_field_fullname, tok.RawString())
+ }
+ bValue = []byte(s)
+ seenValue = true
+
+ default:
+ if !d.opts.DiscardUnknown {
+ return d.newError(tok.Pos(), "invalid field name %q in %v message", tok.RawString(), genid.Any_message_fullname)
+ }
+ }
+
+ case text.TypeName:
+ if isExpanded {
+ return d.newError(tok.Pos(), "cannot have more than one type")
+ }
+ if seenTypeUrl {
+ return d.newError(tok.Pos(), "conflict with type_url field")
+ }
+ typeURL = tok.TypeName()
+ var err error
+ bValue, err = d.unmarshalExpandedAny(typeURL, tok.Pos())
+ if err != nil {
+ return err
+ }
+ isExpanded = true
+
+ default:
+ if !d.opts.DiscardUnknown {
+ return d.newError(tok.Pos(), "invalid field name %q in %v message", tok.RawString(), genid.Any_message_fullname)
+ }
+ }
+ }
+
+ fds := m.Descriptor().Fields()
+ if len(typeURL) > 0 {
+ m.Set(fds.ByNumber(genid.Any_TypeUrl_field_number), pref.ValueOfString(typeURL))
+ }
+ if len(bValue) > 0 {
+ m.Set(fds.ByNumber(genid.Any_Value_field_number), pref.ValueOfBytes(bValue))
+ }
+ return nil
+}
+
+func (d decoder) unmarshalExpandedAny(typeURL string, pos int) ([]byte, error) {
+ mt, err := d.opts.Resolver.FindMessageByURL(typeURL)
+ if err != nil {
+ return nil, d.newError(pos, "unable to resolve message [%v]: %v", typeURL, err)
+ }
+ // Create new message for the embedded message type and unmarshal the value
+ // field into it.
+ m := mt.New()
+ if err := d.unmarshalMessage(m, true); err != nil {
+ return nil, err
+ }
+ // Serialize the embedded message and return the resulting bytes.
+ b, err := proto.MarshalOptions{
+ AllowPartial: true, // Never check required fields inside an Any.
+ Deterministic: true,
+ }.Marshal(m.Interface())
+ if err != nil {
+ return nil, d.newError(pos, "error in marshaling message into Any.value: %v", err)
+ }
+ return b, nil
+}
+
+// skipValue makes the decoder parse a field value in order to advance the read
+// to the next field. It relies on Read returning an error if the types are not
+// in valid sequence.
+func (d decoder) skipValue() error {
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+ // Only need to continue reading for messages and lists.
+ switch tok.Kind() {
+ case text.MessageOpen:
+ return d.skipMessageValue()
+
+ case text.ListOpen:
+ for {
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+ switch tok.Kind() {
+ case text.ListClose:
+ return nil
+ case text.MessageOpen:
+ return d.skipMessageValue()
+ default:
+ // Skip items. This will not validate whether skipped values are
+ // of the same type or not, same behavior as C++
+ // TextFormat::Parser::AllowUnknownField(true) version 3.8.0.
+ }
+ }
+ }
+ return nil
+}
+
+// skipMessageValue makes the decoder parse and skip over all fields in a
+// message. It assumes that the previous read type is MessageOpen.
+func (d decoder) skipMessageValue() error {
+ for {
+ tok, err := d.Read()
+ if err != nil {
+ return err
+ }
+ switch tok.Kind() {
+ case text.MessageClose:
+ return nil
+ case text.Name:
+ if err := d.skipValue(); err != nil {
+ return err
+ }
+ }
+ }
+}
diff --git a/vendor/google.golang.org/protobuf/encoding/prototext/doc.go b/vendor/google.golang.org/protobuf/encoding/prototext/doc.go
new file mode 100644
index 0000000..162b4f9
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/encoding/prototext/doc.go
@@ -0,0 +1,7 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package prototext marshals and unmarshals protocol buffer messages as the
+// textproto format.
+package prototext
diff --git a/vendor/google.golang.org/protobuf/encoding/prototext/encode.go b/vendor/google.golang.org/protobuf/encoding/prototext/encode.go
new file mode 100644
index 0000000..8d5304d
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/encoding/prototext/encode.go
@@ -0,0 +1,371 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package prototext
+
+import (
+ "fmt"
+ "strconv"
+ "unicode/utf8"
+
+ "google.golang.org/protobuf/encoding/protowire"
+ "google.golang.org/protobuf/internal/encoding/messageset"
+ "google.golang.org/protobuf/internal/encoding/text"
+ "google.golang.org/protobuf/internal/errors"
+ "google.golang.org/protobuf/internal/flags"
+ "google.golang.org/protobuf/internal/genid"
+ "google.golang.org/protobuf/internal/order"
+ "google.golang.org/protobuf/internal/pragma"
+ "google.golang.org/protobuf/internal/strs"
+ "google.golang.org/protobuf/proto"
+ "google.golang.org/protobuf/reflect/protoreflect"
+ pref "google.golang.org/protobuf/reflect/protoreflect"
+ "google.golang.org/protobuf/reflect/protoregistry"
+)
+
+const defaultIndent = " "
+
+// Format formats the message as a multiline string.
+// This function is only intended for human consumption and ignores errors.
+// Do not depend on the output being stable. It may change over time across
+// different versions of the program.
+func Format(m proto.Message) string {
+ return MarshalOptions{Multiline: true}.Format(m)
+}
+
+// Marshal writes the given proto.Message in textproto format using default
+// options. Do not depend on the output being stable. It may change over time
+// across different versions of the program.
+func Marshal(m proto.Message) ([]byte, error) {
+ return MarshalOptions{}.Marshal(m)
+}
+
+// MarshalOptions is a configurable text format marshaler.
+type MarshalOptions struct {
+ pragma.NoUnkeyedLiterals
+
+ // Multiline specifies whether the marshaler should format the output in
+ // indented-form with every textual element on a new line.
+ // If Indent is an empty string, then an arbitrary indent is chosen.
+ Multiline bool
+
+ // Indent specifies the set of indentation characters to use in a multiline
+ // formatted output such that every entry is preceded by Indent and
+ // terminated by a newline. If non-empty, then Multiline is treated as true.
+ // Indent can only be composed of space or tab characters.
+ Indent string
+
+ // EmitASCII specifies whether to format strings and bytes as ASCII only
+ // as opposed to using UTF-8 encoding when possible.
+ EmitASCII bool
+
+ // allowInvalidUTF8 specifies whether to permit the encoding of strings
+ // with invalid UTF-8. This is unexported as it is intended to only
+ // be specified by the Format method.
+ allowInvalidUTF8 bool
+
+ // AllowPartial allows messages that have missing required fields to marshal
+ // without returning an error. If AllowPartial is false (the default),
+ // Marshal will return error if there are any missing required fields.
+ AllowPartial bool
+
+ // EmitUnknown specifies whether to emit unknown fields in the output.
+ // If specified, the unmarshaler may be unable to parse the output.
+ // The default is to exclude unknown fields.
+ EmitUnknown bool
+
+ // Resolver is used for looking up types when expanding google.protobuf.Any
+ // messages. If nil, this defaults to using protoregistry.GlobalTypes.
+ Resolver interface {
+ protoregistry.ExtensionTypeResolver
+ protoregistry.MessageTypeResolver
+ }
+}
+
+// Format formats the message as a string.
+// This method is only intended for human consumption and ignores errors.
+// Do not depend on the output being stable. It may change over time across
+// different versions of the program.
+func (o MarshalOptions) Format(m proto.Message) string {
+ if m == nil || !m.ProtoReflect().IsValid() {
+ return "<nil>" // invalid syntax, but okay since this is for debugging
+ }
+ o.allowInvalidUTF8 = true
+ o.AllowPartial = true
+ o.EmitUnknown = true
+ b, _ := o.Marshal(m)
+ return string(b)
+}
+
+// Marshal writes the given proto.Message in textproto format using options in
+// MarshalOptions object. Do not depend on the output being stable. It may
+// change over time across different versions of the program.
+func (o MarshalOptions) Marshal(m proto.Message) ([]byte, error) {
+ return o.marshal(m)
+}
+
+// marshal is a centralized function that all marshal operations go through.
+// For profiling purposes, avoid changing the name of this function or
+// introducing other code paths for marshal that do not go through this.
+func (o MarshalOptions) marshal(m proto.Message) ([]byte, error) {
+ var delims = [2]byte{'{', '}'}
+
+ if o.Multiline && o.Indent == "" {
+ o.Indent = defaultIndent
+ }
+ if o.Resolver == nil {
+ o.Resolver = protoregistry.GlobalTypes
+ }
+
+ internalEnc, err := text.NewEncoder(o.Indent, delims, o.EmitASCII)
+ if err != nil {
+ return nil, err
+ }
+
+ // Treat nil message interface as an empty message,
+ // in which case there is nothing to output.
+ if m == nil {
+ return []byte{}, nil
+ }
+
+ enc := encoder{internalEnc, o}
+ err = enc.marshalMessage(m.ProtoReflect(), false)
+ if err != nil {
+ return nil, err
+ }
+ out := enc.Bytes()
+ if len(o.Indent) > 0 && len(out) > 0 {
+ out = append(out, '\n')
+ }
+ if o.AllowPartial {
+ return out, nil
+ }
+ return out, proto.CheckInitialized(m)
+}
+
+type encoder struct {
+ *text.Encoder
+ opts MarshalOptions
+}
+
+// marshalMessage marshals the given protoreflect.Message.
+func (e encoder) marshalMessage(m pref.Message, inclDelims bool) error {
+ messageDesc := m.Descriptor()
+ if !flags.ProtoLegacy && messageset.IsMessageSet(messageDesc) {
+ return errors.New("no support for proto1 MessageSets")
+ }
+
+ if inclDelims {
+ e.StartMessage()
+ defer e.EndMessage()
+ }
+
+ // Handle Any expansion.
+ if messageDesc.FullName() == genid.Any_message_fullname {
+ if e.marshalAny(m) {
+ return nil
+ }
+ // If unable to expand, continue on to marshal Any as a regular message.
+ }
+
+ // Marshal fields.
+ var err error
+ order.RangeFields(m, order.IndexNameFieldOrder, func(fd protoreflect.FieldDescriptor, v protoreflect.Value) bool {
+ if err = e.marshalField(fd.TextName(), v, fd); err != nil {
+ return false
+ }
+ return true
+ })
+ if err != nil {
+ return err
+ }
+
+ // Marshal unknown fields.
+ if e.opts.EmitUnknown {
+ e.marshalUnknown(m.GetUnknown())
+ }
+
+ return nil
+}
+
+// marshalField marshals the given field with protoreflect.Value.
+func (e encoder) marshalField(name string, val pref.Value, fd pref.FieldDescriptor) error {
+ switch {
+ case fd.IsList():
+ return e.marshalList(name, val.List(), fd)
+ case fd.IsMap():
+ return e.marshalMap(name, val.Map(), fd)
+ default:
+ e.WriteName(name)
+ return e.marshalSingular(val, fd)
+ }
+}
+
+// marshalSingular marshals the given non-repeated field value. This includes
+// all scalar types, enums, messages, and groups.
+func (e encoder) marshalSingular(val pref.Value, fd pref.FieldDescriptor) error {
+ kind := fd.Kind()
+ switch kind {
+ case pref.BoolKind:
+ e.WriteBool(val.Bool())
+
+ case pref.StringKind:
+ s := val.String()
+ if !e.opts.allowInvalidUTF8 && strs.EnforceUTF8(fd) && !utf8.ValidString(s) {
+ return errors.InvalidUTF8(string(fd.FullName()))
+ }
+ e.WriteString(s)
+
+ case pref.Int32Kind, pref.Int64Kind,
+ pref.Sint32Kind, pref.Sint64Kind,
+ pref.Sfixed32Kind, pref.Sfixed64Kind:
+ e.WriteInt(val.Int())
+
+ case pref.Uint32Kind, pref.Uint64Kind,
+ pref.Fixed32Kind, pref.Fixed64Kind:
+ e.WriteUint(val.Uint())
+
+ case pref.FloatKind:
+ // Encoder.WriteFloat handles the special numbers NaN and infinites.
+ e.WriteFloat(val.Float(), 32)
+
+ case pref.DoubleKind:
+ // Encoder.WriteFloat handles the special numbers NaN and infinites.
+ e.WriteFloat(val.Float(), 64)
+
+ case pref.BytesKind:
+ e.WriteString(string(val.Bytes()))
+
+ case pref.EnumKind:
+ num := val.Enum()
+ if desc := fd.Enum().Values().ByNumber(num); desc != nil {
+ e.WriteLiteral(string(desc.Name()))
+ } else {
+ // Use numeric value if there is no enum description.
+ e.WriteInt(int64(num))
+ }
+
+ case pref.MessageKind, pref.GroupKind:
+ return e.marshalMessage(val.Message(), true)
+
+ default:
+ panic(fmt.Sprintf("%v has unknown kind: %v", fd.FullName(), kind))
+ }
+ return nil
+}
+
+// marshalList marshals the given protoreflect.List as multiple name-value fields.
+func (e encoder) marshalList(name string, list pref.List, fd pref.FieldDescriptor) error {
+ size := list.Len()
+ for i := 0; i < size; i++ {
+ e.WriteName(name)
+ if err := e.marshalSingular(list.Get(i), fd); err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+// marshalMap marshals the given protoreflect.Map as multiple name-value fields.
+func (e encoder) marshalMap(name string, mmap pref.Map, fd pref.FieldDescriptor) error {
+ var err error
+ order.RangeEntries(mmap, order.GenericKeyOrder, func(key pref.MapKey, val pref.Value) bool {
+ e.WriteName(name)
+ e.StartMessage()
+ defer e.EndMessage()
+
+ e.WriteName(string(genid.MapEntry_Key_field_name))
+ err = e.marshalSingular(key.Value(), fd.MapKey())
+ if err != nil {
+ return false
+ }
+
+ e.WriteName(string(genid.MapEntry_Value_field_name))
+ err = e.marshalSingular(val, fd.MapValue())
+ if err != nil {
+ return false
+ }
+ return true
+ })
+ return err
+}
+
+// marshalUnknown parses the given []byte and marshals fields out.
+// This function assumes proper encoding in the given []byte.
+func (e encoder) marshalUnknown(b []byte) {
+ const dec = 10
+ const hex = 16
+ for len(b) > 0 {
+ num, wtype, n := protowire.ConsumeTag(b)
+ b = b[n:]
+ e.WriteName(strconv.FormatInt(int64(num), dec))
+
+ switch wtype {
+ case protowire.VarintType:
+ var v uint64
+ v, n = protowire.ConsumeVarint(b)
+ e.WriteUint(v)
+ case protowire.Fixed32Type:
+ var v uint32
+ v, n = protowire.ConsumeFixed32(b)
+ e.WriteLiteral("0x" + strconv.FormatUint(uint64(v), hex))
+ case protowire.Fixed64Type:
+ var v uint64
+ v, n = protowire.ConsumeFixed64(b)
+ e.WriteLiteral("0x" + strconv.FormatUint(v, hex))
+ case protowire.BytesType:
+ var v []byte
+ v, n = protowire.ConsumeBytes(b)
+ e.WriteString(string(v))
+ case protowire.StartGroupType:
+ e.StartMessage()
+ var v []byte
+ v, n = protowire.ConsumeGroup(num, b)
+ e.marshalUnknown(v)
+ e.EndMessage()
+ default:
+ panic(fmt.Sprintf("prototext: error parsing unknown field wire type: %v", wtype))
+ }
+
+ b = b[n:]
+ }
+}
+
+// marshalAny marshals the given google.protobuf.Any message in expanded form.
+// It returns true if it was able to marshal, else false.
+func (e encoder) marshalAny(any pref.Message) bool {
+ // Construct the embedded message.
+ fds := any.Descriptor().Fields()
+ fdType := fds.ByNumber(genid.Any_TypeUrl_field_number)
+ typeURL := any.Get(fdType).String()
+ mt, err := e.opts.Resolver.FindMessageByURL(typeURL)
+ if err != nil {
+ return false
+ }
+ m := mt.New().Interface()
+
+ // Unmarshal bytes into embedded message.
+ fdValue := fds.ByNumber(genid.Any_Value_field_number)
+ value := any.Get(fdValue)
+ err = proto.UnmarshalOptions{
+ AllowPartial: true,
+ Resolver: e.opts.Resolver,
+ }.Unmarshal(value.Bytes(), m)
+ if err != nil {
+ return false
+ }
+
+ // Get current encoder position. If marshaling fails, reset encoder output
+ // back to this position.
+ pos := e.Snapshot()
+
+ // Field name is the proto field name enclosed in [].
+ e.WriteName("[" + typeURL + "]")
+ err = e.marshalMessage(m.ProtoReflect(), true)
+ if err != nil {
+ e.Reset(pos)
+ return false
+ }
+ return true
+}
diff --git a/vendor/google.golang.org/protobuf/encoding/protowire/wire.go b/vendor/google.golang.org/protobuf/encoding/protowire/wire.go
new file mode 100644
index 0000000..a427f8b
--- /dev/null
+++ b/vendor/google.golang.org/protobuf/encoding/protowire/wire.go
@@ -0,0 +1,538 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package protowire parses and formats the raw wire encoding.
+// See https://developers.google.com/protocol-buffers/docs/encoding.
+//
+// For marshaling and unmarshaling entire protobuf messages,
+// use the "google.golang.org/protobuf/proto" package instead.
+package protowire
+
+import (
+ "io"
+ "math"
+ "math/bits"
+
+ "google.golang.org/protobuf/internal/errors"
+)
+
+// Number represents the field number.
+type Number int32
+
+const (
+ MinValidNumber Number = 1
+ FirstReservedNumber Number = 19000
+ LastReservedNumber Number = 19999
+ MaxValidNumber Number = 1<<29 - 1
+)
+
+// IsValid reports whether the field number is semantically valid.
+//
+// Note that while numbers within the reserved range are semantically invalid,
+// they are syntactically valid in the wire format.
+// Implementations may treat records with reserved field numbers as unknown.
+func (n Number) IsValid() bool {
+ return MinValidNumber <= n && n < FirstReservedNumber || LastReservedNumber < n && n <= MaxValidNumber
+}
+
+// Type represents the wire type.
+type Type int8
+
+const (
+ VarintType Type = 0
+ Fixed32Type Type = 5
+ Fixed64Type Type = 1
+ BytesType Type = 2
+ StartGroupType Type = 3
+ EndGroupType Type = 4
+)
+
+const (
+ _ = -iota
+ errCodeTruncated
+ errCodeFieldNumber
+ errCodeOverflow
+ errCodeReserved
+ errCodeEndGroup
+)
+
+var (
+ errFieldNumber = errors.New("invalid field number")
+ errOverflow = errors.New("variable length integer overflow")
+ errReserved = errors.New("cannot parse reserved wire type")
+ errEndGroup = errors.New("mismatching end group marker")
+ errParse = errors.New("parse error")
+)
+
+// ParseError converts an error code into an error value.
+// This returns nil if n is a non-negative number.
+func ParseError(n int) error {
+ if n >= 0 {
+ return nil
+ }
+ switch n {
+ case errCodeTruncated:
+ return io.ErrUnexpectedEOF
+ case errCodeFieldNumber:
+ return errFieldNumber
+ case errCodeOverflow:
+ return errOverflow
+ case errCodeReserved:
+ return errReserved
+ case errCodeEndGroup:
+ return errEndGroup
+ default:
+ return errParse
+ }
+}
+
+// ConsumeField parses an entire field record (both tag and value) and returns
+// the field number, the wire type, and the total length.
+// This returns a negative length upon an error (see ParseError).
+//
+// The total length includes the tag header and the end group marker (if the
+// field is a group).
+func ConsumeField(b []byte) (Number, Type, int) {
+ num, typ, n := ConsumeTag(b)
+ if n < 0 {
+ return 0, 0, n // forward error code
+ }
+ m := ConsumeFieldValue(num, typ, b[n:])
+ if m < 0 {
+ return 0, 0, m // forward error code
+ }
+ return num, typ, n + m
+}
+
+// ConsumeFieldValue parses a field value and returns its length.
+// This assumes that the field Number and wire Type have already been parsed.
+// This returns a negative length upon an error (see ParseError).
+//
+// When parsing a group, the length includes the end group marker and
+// the end group is verified to match the starting field number.
+func ConsumeFieldValue(num Number, typ Type, b []byte) (n int) {
+ switch typ {
+ case VarintType:
+ _, n = ConsumeVarint(b)
+ return n
+ case Fixed32Type:
+ _, n = ConsumeFixed32(b)
+ return n
+ case Fixed64Type:
+ _, n = ConsumeFixed64(b)
+ return n
+ case BytesType:
+ _, n = ConsumeBytes(b)
+ return n
+ case StartGroupType:
+ n0 := len(b)
+ for {
+ num2, typ2, n := ConsumeTag(b)
+ if n < 0 {
+ return n // forward error code
+ }
+ b = b[n:]
+ if typ2 == EndGroupType {
+ if num != num2 {
+ return errCodeEndGroup
+ }
+ return n0 - len(b)
+ }
+
+ n = ConsumeFieldValue(num2, typ2, b)
+ if n < 0 {
+ return n // forward error code
+ }
+ b = b[n:]
+ }
+ case EndGroupType:
+ return errCodeEndGroup
+ default:
+ return errCodeReserved
+ }
+}
+
+// AppendTag encodes num and typ as a varint-encoded tag and appends it to b.
+func AppendTag(b []byte, num Number, typ Type) []byte {
+ return AppendVarint(b, EncodeTag(num, typ))
+}
+
+// ConsumeTag parses b as a varint-encoded tag, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeTag(b []byte) (Number, Type, int) {
+ v, n := ConsumeVarint(b)
+ if n < 0 {
+ return 0, 0, n // forward error code
+ }
+ num, typ := DecodeTag(v)
+ if num < MinValidNumber {
+ return 0, 0, errCodeFieldNumber
+ }
+ return num, typ, n
+}
+
+func SizeTag(num Number) int {
+ return SizeVarint(EncodeTag(num, 0)) // wire type has no effect on size
+}
+
+// AppendVarint appends v to b as a varint-encoded uint64.
+func AppendVarint(b []byte, v uint64) []byte {
+ switch {
+ case v < 1<<7:
+ b = append(b, byte(v))
+ case v < 1<<14:
+ b = append(b,
+ byte((v>>0)&0x7f|0x80),
+ byte(v>>7))
+ case v < 1<<21:
+ b = append(b,
+ byte((v>>0)&0x7f|0x80),
+ byte((v>>7)&0x7f|0x80),
+ byte(v>>14))
+ case v < 1<<28:
+ b = append(b,
+ byte((v>>0)&0x7f|0x80),
+ byte((v>>7)&0x7f|0x80),
+ byte((v>>14)&0x7f|0x80),
+ byte(v>>21))
+ case v < 1<<35:
+ b = append(b,
+ byte((v>>0)&0x7f|0x80),
+ byte((v>>7)&0x7f|0x80),
+ byte((v>>14)&0x7f|0x80),
+ byte((v>>21)&0x7f|0x80),
+ byte(v>>28))
+ case v < 1<<42:
+ b = append(b,
+ byte((v>>0)&0x7f|0x80),
+ byte((v>>7)&0x7f|0x80),
+ byte((v>>14)&0x7f|0x80),
+ byte((v>>21)&0x7f|0x80),
+ byte((v>>28)&0x7f|0x80),
+ byte(v>>35))
+ case v < 1<<49:
+ b = append(b,
+ byte((v>>0)&0x7f|0x80),
+ byte((v>>7)&0x7f|0x80),
+ byte((v>>14)&0x7f|0x80),
+ byte((v>>21)&0x7f|0x80),
+ byte((v>>28)&0x7f|0x80),
+ byte((v>>35)&0x7f|0x80),
+ byte(v>>42))
+ case v < 1<<56:
+ b = append(b,
+ byte((v>>0)&0x7f|0x80),
+ byte((v>>7)&0x7f|0x80),
+ byte((v>>14)&0x7f|0x80),
+ byte((v>>21)&0x7f|0x80),
+ byte((v>>28)&0x7f|0x80),
+ byte((v>>35)&0x7f|0x80),
+ byte((v>>42)&0x7f|0x80),
+ byte(v>>49))
+ case v < 1<<63:
+ b = append(b,
+ byte((v>>0)&0x7f|0x80),
+ byte((v>>7)&0x7f|0x80),
+ byte((v>>14)&0x7f|0x80),
+ byte((v>>21)&0x7f|0x80),
+ byte((v>>28)&0x7f|0x80),
+ byte((v>>35)&0x7f|0x80),
+ byte((v>>42)&0x7f|0x80),
+ byte((v>>49)&0x7f|0x80),
+ byte(v>>56))
+ default:
+ b = append(b,
+ byte((v>>0)&0x7f|0x80),
+ byte((v>>7)&0x7f|0x80),
+ byte((v>>14)&0x7f|0x80),
+ byte((v>>21)&0x7f|0x80),
+ byte((v>>28)&0x7f|0x80),
+ byte((v>>35)&0x7f|0x80),
+ byte((v>>42)&0x7f|0x80),
+ byte((v>>49)&0x7f|0x80),
+ byte((v>>56)&0x7f|0x80),
+ 1)
+ }
+ return b
+}
+
+// ConsumeVarint parses b as a varint-encoded uint64, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeVarint(b []byte) (v uint64, n int) {
+ var y uint64
+ if len(b) <= 0 {
+ return 0, errCodeTruncated
+ }
+ v = uint64(b[0])
+ if v < 0x80 {
+ return v, 1
+ }
+ v -= 0x80
+
+ if len(b) <= 1 {
+ return 0, errCodeTruncated
+ }
+ y = uint64(b[1])
+ v += y << 7
+ if y < 0x80 {
+ return v, 2
+ }
+ v -= 0x80 << 7
+
+ if len(b) <= 2 {
+ return 0, errCodeTruncated
+ }
+ y = uint64(b[2])
+ v += y << 14
+ if y < 0x80 {
+ return v, 3
+ }
+ v -= 0x80 << 14
+
+ if len(b) <= 3 {
+ return 0, errCodeTruncated
+ }
+ y = uint64(b[3])
+ v += y << 21
+ if y < 0x80 {
+ return v, 4
+ }
+ v -= 0x80 << 21
+
+ if len(b) <= 4 {
+ return 0, errCodeTruncated
+ }
+ y = uint64(b[4])
+ v += y << 28
+ if y < 0x80 {
+ return v, 5
+ }
+ v -= 0x80 << 28
+
+ if len(b) <= 5 {
+ return 0, errCodeTruncated
+ }
+ y = uint64(b[5])
+ v += y << 35
+ if y < 0x80 {
+ return v, 6
+ }
+ v -= 0x80 << 35
+
+ if len(b) <= 6 {
+ return 0, errCodeTruncated
+ }
+ y = uint64(b[6])
+ v += y << 42
+ if y < 0x80 {
+ return v, 7
+ }
+ v -= 0x80 << 42
+
+ if len(b) <= 7 {
+ return 0, errCodeTruncated
+ }
+ y = uint64(b[7])
+ v += y << 49
+ if y < 0x80 {
+ return v, 8
+ }
+ v -= 0x80 << 49
+
+ if len(b) <= 8 {
+ return 0, errCodeTruncated
+ }
+ y = uint64(b[8])
+ v += y << 56
+ if y < 0x80 {
+ return v, 9
+ }
+ v -= 0x80 << 56
+
+ if len(b) <= 9 {
+ return 0, errCodeTruncated
+ }
+ y = uint64(b[9])
+ v += y << 63
+ if y < 2 {
+ return v, 10
+ }
+ return 0, errCodeOverflow
+}
+
+// SizeVarint returns the encoded size of a varint.
+// The size is guaranteed to be within 1 and 10, inclusive.
+func SizeVarint(v uint64) int {
+ // This computes 1 + (bits.Len64(v)-1)/7.
+ // 9/64 is a good enough approximation of 1/7
+ return int(9*uint32(bits.Len64(v))+64) / 64
+}
+
+// AppendFixed32 appends v to b as a little-endian uint32.
+func AppendFixed32(b []byte, v uint32) []byte {
+ return append(b,
+ byte(v>>0),
+ byte(v>>8),
+ byte(v>>16),
+ byte(v>>24))
+}
+
+// ConsumeFixed32 parses b as a little-endian uint32, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeFixed32(b []byte) (v uint32, n int) {
+ if len(b) < 4 {
+ return 0, errCodeTruncated
+ }
+ v = uint32(b[0])<<0 | uint32(b[1])<<8 | uint32(b[2])<<16 | uint32(b[3])<<24
+ return v, 4
+}
+
+// SizeFixed32 returns the encoded size of a fixed32; which is always 4.
+func SizeFixed32() int {
+ return 4
+}
+
+// AppendFixed64 appends v to b as a little-endian uint64.
+func AppendFixed64(b []byte, v uint64) []byte {
+ return append(b,
+ byte(v>>0),
+ byte(v>>8),
+ byte(v>>16),
+ byte(v>>24),
+ byte(v>>32),
+ byte(v>>40),
+ byte(v>>48),
+ byte(v>>56))
+}
+
+// ConsumeFixed64 parses b as a little-endian uint64, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeFixed64(b []byte) (v uint64, n int) {
+ if len(b) < 8 {
+ return 0, errCodeTruncated
+ }
+ v = uint64(b[0])<<0 | uint64(b[1])<<8 | uint64(b[2])<<16 | uint64(b[3])<<24 | uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
+ return v, 8
+}
+
+// SizeFixed64 returns the encoded size of a fixed64; which is always 8.
+func SizeFixed64() int {
+ return 8
+}
+
+// AppendBytes appends v to b as a length-prefixed bytes value.
+func AppendBytes(b []byte, v []byte) []byte {
+ return append(AppendVarint(b, uint64(len(v))), v...)
+}
+
+// ConsumeBytes parses b as a length-prefixed bytes value, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeBytes(b []byte) (v []byte, n int) {
+ m, n := ConsumeVarint(b)
+ if n < 0 {
+ return nil, n // forward error code
+ }
+ if m > uint64(len(b[n:])) {
+ return nil, errCodeTruncated
+ }
+ return b[n:][:m], n + int(m)
+}
+
+// SizeBytes returns the encoded size of a length-prefixed bytes value,
+// given only the length.
+func SizeBytes(n int) int {
+ return SizeVarint(uint64(n)) + n
+}
+
+// AppendString appends v to b as a length-prefixed bytes value.
+func AppendString(b []byte, v string) []byte {
+ return append(AppendVarint(b, uint64(len(v))), v...)
+}
+
+// ConsumeString parses b as a length-prefixed bytes value, reporting its length.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeString(b []byte) (v string, n int) {
+ bb, n := ConsumeBytes(b)
+ return string(bb), n
+}
+
+// AppendGroup appends v to b as group value, with a trailing end group marker.
+// The value v must not contain the end marker.
+func AppendGroup(b []byte, num Number, v []byte) []byte {
+ return AppendVarint(append(b, v...), EncodeTag(num, EndGroupType))
+}
+
+// ConsumeGroup parses b as a group value until the trailing end group marker,
+// and verifies that the end marker matches the provided num. The value v
+// does not contain the end marker, while the length does contain the end marker.
+// This returns a negative length upon an error (see ParseError).
+func ConsumeGroup(num Number, b []byte) (v []byte, n int) {
+ n = ConsumeFieldValue(num, StartGroupType, b)
+ if n < 0 {
+ return nil, n // forward error code
+ }
+ b = b[:n]
+
+ // Truncate off end group marker, but need to handle denormalized varints.
+ // Assuming end marker is never 0 (which is always the case since
+ // EndGroupType is non-zero), we can truncate all trailing bytes where the
+ // lower 7 bits are all zero (implying that the varint is denormalized).
+ for len(b) > 0 && b[len(b)-1]&0x7f == 0 {
+ b = b[:len(b)-1]
+ }
+ b = b[:len(b)-SizeTag(num)]
+ return b, n
+}
+
+// SizeGroup returns the encoded size of a group, given only the length.
+func SizeGroup(num Number, n int) int {
+ return n + SizeTag(num)
+}
+
+// DecodeTag decodes the field Number and wire Type from its unified form.
+// The Number is -1 if the decoded field number overflows int32.
+// Other than overflow, this does not check for field number validity.
+func DecodeTag(x uint64) (Number, Type) {
+ // NOTE: MessageSet allows for larger field numbers than normal.
+ if x>>3 > uint64(math.MaxInt32) {
+ return -1, 0
+ }
+ return Number(x >> 3), Type(x & 7)
+}
+
+// EncodeTag encodes the field Number and wire Type into its unified form.
+func EncodeTag(num Number, typ Type) uint64 {
+ return uint64(num)<<3 | uint64(typ&7)
+}
+
+// DecodeZigZag decodes a zig-zag-encoded uint64 as an int64.
+// Input: {…, 5, 3, 1, 0, 2, 4, 6, …}
+// Output: {…, -3, -2, -1, 0, +1, +2, +3, …}
+func DecodeZigZag(x uint64) int64 {
+ return int64(x>>1) ^ int64(x)<<63>>63
+}
+
+// EncodeZigZag encodes an int64 as a zig-zag-encoded uint64.
+// Input: {…, -3, -2, -1, 0, +1, +2, +3, …}
+// Output: {…, 5, 3, 1, 0, 2, 4, 6, …}
+func EncodeZigZag(x int64) uint64 {
+ return uint64(x<<1) ^ uint64(x>>63)
+}
+
+// DecodeBool decodes a uint64 as a bool.
+// Input: { 0, 1, 2, …}
+// Output: {false, true, true, …}
+func DecodeBool(x uint64) bool {
+ return x != 0
+}
+
+// EncodeBool encodes a bool as a uint64.
+// Input: {false, true}
+// Output: { 0, 1}
+func EncodeBool(x bool) uint64 {
+ if x {
+ return 1
+ }
+ return 0
+}