1 files changed, 0 insertions, 241 deletions
diff --git a/internal/encoding/messageset/messageset.go b/internal/encoding/messageset/messageset.go
deleted file mode 100644
index c1866f3c..00000000
--- a/internal/encoding/messageset/messageset.go
+++ /dev/null
@@ -1,241 +0,0 @@
-// 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 messageset encodes and decodes the obsolete MessageSet wire format.
-package messageset
-
-import (
-	"math"
-
-	"google.golang.org/protobuf/encoding/protowire"
-	"google.golang.org/protobuf/internal/errors"
-	pref "google.golang.org/protobuf/reflect/protoreflect"
-)
-
-// The MessageSet wire format is equivalent to a message defined as follows,
-// where each Item defines an extension field with a field number of 'type_id'
-// and content of 'message'. MessageSet extensions must be non-repeated message
-// fields.
-//
-//	message MessageSet {
-//		repeated group Item = 1 {
-//			required int32 type_id = 2;
-//			required string message = 3;
-//		}
-//	}
-const (
-	FieldItem    = protowire.Number(1)
-	FieldTypeID  = protowire.Number(2)
-	FieldMessage = protowire.Number(3)
-)
-
-// ExtensionName is the field name for extensions of MessageSet.
-//
-// A valid MessageSet extension must be of the form:
-//	message MyMessage {
-//		extend proto2.bridge.MessageSet {
-//			optional MyMessage message_set_extension = 1234;
-//		}
-//		...
-//	}
-const ExtensionName = "message_set_extension"
-
-// IsMessageSet returns whether the message uses the MessageSet wire format.
-func IsMessageSet(md pref.MessageDescriptor) bool {
-	xmd, ok := md.(interface{ IsMessageSet() bool })
-	return ok && xmd.IsMessageSet()
-}
-
-// IsMessageSetExtension reports this field properly extends a MessageSet.
-func IsMessageSetExtension(fd pref.FieldDescriptor) bool {
-	switch {
-	case fd.Name() != ExtensionName:
-		return false
-	case !IsMessageSet(fd.ContainingMessage()):
-		return false
-	case fd.FullName().Parent() != fd.Message().FullName():
-		return false
-	}
-	return true
-}
-
-// SizeField returns the size of a MessageSet item field containing an extension
-// with the given field number, not counting the contents of the message subfield.
-func SizeField(num protowire.Number) int {
-	return 2*protowire.SizeTag(FieldItem) + protowire.SizeTag(FieldTypeID) + protowire.SizeVarint(uint64(num))
-}
-
-// Unmarshal parses a MessageSet.
-//
-// It calls fn with the type ID and value of each item in the MessageSet.
-// Unknown fields are discarded.
-//
-// If wantLen is true, the item values include the varint length prefix.
-// This is ugly, but simplifies the fast-path decoder in internal/impl.
-func Unmarshal(b []byte, wantLen bool, fn func(typeID protowire.Number, value []byte) error) error {
-	for len(b) > 0 {
-		num, wtyp, n := protowire.ConsumeTag(b)
-		if n < 0 {
-			return protowire.ParseError(n)
-		}
-		b = b[n:]
-		if num != FieldItem || wtyp != protowire.StartGroupType {
-			n := protowire.ConsumeFieldValue(num, wtyp, b)
-			if n < 0 {
-				return protowire.ParseError(n)
-			}
-			b = b[n:]
-			continue
-		}
-		typeID, value, n, err := ConsumeFieldValue(b, wantLen)
-		if err != nil {
-			return err
-		}
-		b = b[n:]
-		if typeID == 0 {
-			continue
-		}
-		if err := fn(typeID, value); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// ConsumeFieldValue parses b as a MessageSet item field value until and including
-// the trailing end group marker. It assumes the start group tag has already been parsed.
-// It returns the contents of the type_id and message subfields and the total
-// item length.
-//
-// If wantLen is true, the returned message value includes the length prefix.
-func ConsumeFieldValue(b []byte, wantLen bool) (typeid protowire.Number, message []byte, n int, err error) {
-	ilen := len(b)
-	for {
-		num, wtyp, n := protowire.ConsumeTag(b)
-		if n < 0 {
-			return 0, nil, 0, protowire.ParseError(n)
-		}
-		b = b[n:]
-		switch {
-		case num == FieldItem && wtyp == protowire.EndGroupType:
-			if wantLen && len(message) == 0 {
-				// The message field was missing, which should never happen.
-				// Be prepared for this case anyway.
-				message = protowire.AppendVarint(message, 0)
-			}
-			return typeid, message, ilen - len(b), nil
-		case num == FieldTypeID && wtyp == protowire.VarintType:
-			v, n := protowire.ConsumeVarint(b)
-			if n < 0 {
-				return 0, nil, 0, protowire.ParseError(n)
-			}
-			b = b[n:]
-			if v < 1 || v > math.MaxInt32 {
-				return 0, nil, 0, errors.New("invalid type_id in message set")
-			}
-			typeid = protowire.Number(v)
-		case num == FieldMessage && wtyp == protowire.BytesType:
-			m, n := protowire.ConsumeBytes(b)
-			if n < 0 {
-				return 0, nil, 0, protowire.ParseError(n)
-			}
-			if message == nil {
-				if wantLen {
-					message = b[:n:n]
-				} else {
-					message = m[:len(m):len(m)]
-				}
-			} else {
-				// This case should never happen in practice, but handle it for
-				// correctness: The MessageSet item contains multiple message
-				// fields, which need to be merged.
-				//
-				// In the case where we're returning the length, this becomes
-				// quite inefficient since we need to strip the length off
-				// the existing data and reconstruct it with the combined length.
-				if wantLen {
-					_, nn := protowire.ConsumeVarint(message)
-					m0 := message[nn:]
-					message = nil
-					message = protowire.AppendVarint(message, uint64(len(m0)+len(m)))
-					message = append(message, m0...)
-					message = append(message, m...)
-				} else {
-					message = append(message, m...)
-				}
-			}
-			b = b[n:]
-		default:
-			// We have no place to put it, so we just ignore unknown fields.
-			n := protowire.ConsumeFieldValue(num, wtyp, b)
-			if n < 0 {
-				return 0, nil, 0, protowire.ParseError(n)
-			}
-			b = b[n:]
-		}
-	}
-}
-
-// AppendFieldStart appends the start of a MessageSet item field containing
-// an extension with the given number. The caller must add the message
-// subfield (including the tag).
-func AppendFieldStart(b []byte, num protowire.Number) []byte {
-	b = protowire.AppendTag(b, FieldItem, protowire.StartGroupType)
-	b = protowire.AppendTag(b, FieldTypeID, protowire.VarintType)
-	b = protowire.AppendVarint(b, uint64(num))
-	return b
-}
-
-// AppendFieldEnd appends the trailing end group marker for a MessageSet item field.
-func AppendFieldEnd(b []byte) []byte {
-	return protowire.AppendTag(b, FieldItem, protowire.EndGroupType)
-}
-
-// SizeUnknown returns the size of an unknown fields section in MessageSet format.
-//
-// See AppendUnknown.
-func SizeUnknown(unknown []byte) (size int) {
-	for len(unknown) > 0 {
-		num, typ, n := protowire.ConsumeTag(unknown)
-		if n < 0 || typ != protowire.BytesType {
-			return 0
-		}
-		unknown = unknown[n:]
-		_, n = protowire.ConsumeBytes(unknown)
-		if n < 0 {
-			return 0
-		}
-		unknown = unknown[n:]
-		size += SizeField(num) + protowire.SizeTag(FieldMessage) + n
-	}
-	return size
-}
-
-// AppendUnknown appends unknown fields to b in MessageSet format.
-//
-// For historic reasons, unresolved items in a MessageSet are stored in a
-// message's unknown fields section in non-MessageSet format. That is, an
-// unknown item with typeID T and value V appears in the unknown fields as
-// a field with number T and value V.
-//
-// This function converts the unknown fields back into MessageSet form.
-func AppendUnknown(b, unknown []byte) ([]byte, error) {
-	for len(unknown) > 0 {
-		num, typ, n := protowire.ConsumeTag(unknown)
-		if n < 0 || typ != protowire.BytesType {
-			return nil, errors.New("invalid data in message set unknown fields")
-		}
-		unknown = unknown[n:]
-		_, n = protowire.ConsumeBytes(unknown)
-		if n < 0 {
-			return nil, errors.New("invalid data in message set unknown fields")
-		}
-		b = AppendFieldStart(b, num)
-		b = protowire.AppendTag(b, FieldMessage, protowire.BytesType)
-		b = append(b, unknown[:n]...)
-		b = AppendFieldEnd(b)
-		unknown = unknown[n:]
-	}
-	return b, nil
-}