cmd/protoc-gen-go: re-escape default byte values

Historically, protoc-gen-go outputted the escaped form of bytes as provided by
protoc verbatim. This behavior is buggy, but nothing really uses this tag
since default values are properties of getters instead of serialization.
Rather than fixing it, just preserve prior behavior. Otherwise, logic depending
on the old legacy behavior will not be able to distinguish between the unescaped
or the escaped forms.

Furthermore, since protoc-gen-go historically copied the protoc output verbatim,
we will need to escape the default bytes in a way that is identical to the
CEscape function from strutil.cc of the protoc source code.

Change-Id: I0ab55e220ae430dd123ad050406e285788f6cb40
Reviewed-on: https://go-review.googlesource.com/c/143543
Reviewed-by: Damien Neil <dneil@google.com>
diff --git a/cmd/protoc-gen-go/internal_gengo/main.go b/cmd/protoc-gen-go/internal_gengo/main.go
index 509bbc0..154e95a 100644
--- a/cmd/protoc-gen-go/internal_gengo/main.go
+++ b/cmd/protoc-gen-go/internal_gengo/main.go
@@ -682,7 +682,36 @@
 				def = "0"
 			}
 		case protoreflect.BytesKind:
-			def = string(field.Desc.Default().Bytes())
+			// Preserve protoc-gen-go's historical output of escaped bytes.
+			// This behavior is buggy, but fixing it makes it impossible to
+			// distinguish between the escaped and unescaped forms.
+			//
+			// To match the exact output of protoc, this is identical to the
+			// CEscape function in strutil.cc of the protoc source code.
+			var b []byte
+			for _, c := range field.Desc.Default().Bytes() {
+				switch c {
+				case '\n':
+					b = append(b, `\n`...)
+				case '\r':
+					b = append(b, `\r`...)
+				case '\t':
+					b = append(b, `\t`...)
+				case '"':
+					b = append(b, `\"`...)
+				case '\'':
+					b = append(b, `\'`...)
+				case '\\':
+					b = append(b, `\\`...)
+				default:
+					if c >= 0x20 && c <= 0x7e {
+						b = append(b, c)
+					} else {
+						b = append(b, fmt.Sprintf(`\%03o`, c)...)
+					}
+				}
+			}
+			def = string(b)
 		case protoreflect.FloatKind, protoreflect.DoubleKind:
 			f := field.Desc.Default().Float()
 			switch {
diff --git a/cmd/protoc-gen-go/testdata/proto2/fields.pb.go b/cmd/protoc-gen-go/testdata/proto2/fields.pb.go
index b52cd4c..775de73 100644
--- a/cmd/protoc-gen-go/testdata/proto2/fields.pb.go
+++ b/cmd/protoc-gen-go/testdata/proto2/fields.pb.go
@@ -129,8 +129,8 @@
 	DefaultSfixed64     *int64                               `protobuf:"fixed64,312,opt,name=default_sfixed64,json=defaultSfixed64,def=1" json:"default_sfixed64,omitempty"`
 	DefaultFixed64      *uint64                              `protobuf:"fixed64,313,opt,name=default_fixed64,json=defaultFixed64,def=1" json:"default_fixed64,omitempty"`
 	DefaultDouble       *float64                             `protobuf:"fixed64,314,opt,name=default_double,json=defaultDouble,def=3.1415" json:"default_double,omitempty"`
-	DefaultString       *string                              `protobuf:"bytes,315,opt,name=default_string,json=defaultString,def=x,y" json:"default_string,omitempty"`
-	DefaultBytes        []byte                               `protobuf:"bytes,316,opt,name=default_bytes,json=defaultBytes,def=x,y" json:"default_bytes,omitempty"`
+	DefaultString       *string                              `protobuf:"bytes,315,opt,name=default_string,json=defaultString,def=hello,\"world!\"\n" json:"default_string,omitempty"`
+	DefaultBytes        []byte                               `protobuf:"bytes,316,opt,name=default_bytes,json=defaultBytes,def=hello,\\336\\255\\276\\357" json:"default_bytes,omitempty"`
 	DefaultZeroString   *string                              `protobuf:"bytes,350,opt,name=default_zero_string,json=defaultZeroString,def=" json:"default_zero_string,omitempty"`
 	DefaultZeroBytes    []byte                               `protobuf:"bytes,351,opt,name=default_zero_bytes,json=defaultZeroBytes,def=" json:"default_zero_bytes,omitempty"`
 	DefaultFloatNeginf  *float32                             `protobuf:"fixed32,400,opt,name=default_float_neginf,json=defaultFloatNeginf,def=-inf" json:"default_float_neginf,omitempty"`
@@ -211,9 +211,9 @@
 const Default_FieldTestMessage_DefaultSfixed64 int64 = 1
 const Default_FieldTestMessage_DefaultFixed64 uint64 = 1
 const Default_FieldTestMessage_DefaultDouble float64 = 3.1415
-const Default_FieldTestMessage_DefaultString string = "x,y"
+const Default_FieldTestMessage_DefaultString string = "hello,\"world!\"\n"
 
-var Default_FieldTestMessage_DefaultBytes []byte = []byte("x,y")
+var Default_FieldTestMessage_DefaultBytes []byte = []byte("hello,ޭ\xbe\xef")
 var Default_FieldTestMessage_DefaultFloatNeginf float32 = float32(math.Inf(-1))
 var Default_FieldTestMessage_DefaultFloatPosinf float32 = float32(math.Inf(1))
 var Default_FieldTestMessage_DefaultFloatNan float32 = float32(math.NaN())
@@ -1644,125 +1644,127 @@
 func init() { proto.RegisterFile("proto2/fields.proto", fileDescriptor_fd8a9d72b841fd68) }
 
 var fileDescriptor_fd8a9d72b841fd68 = []byte{
-	// 1912 bytes of a gzipped FileDescriptorProto
+	// 1941 bytes of a gzipped FileDescriptorProto
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+	0xff, 0x56, 0x64, 0xcf, 0x6d, 0x9f, 0xb9, 0xe7, 0xc6, 0x23, 0xd9, 0x5b, 0x24, 0xe1, 0x07, 0x69,
+	0x3e, 0xbe, 0x1f, 0xd5, 0x87, 0x76, 0x8c, 0x0e, 0x08, 0x05, 0x13, 0xdc, 0x0b, 0xc7, 0x43, 0xd5,
+	0xdb, 0xff, 0x87, 0x3e, 0xef, 0x38, 0x87, 0x0f, 0xee, 0x18, 0x15, 0x40, 0xab, 0xe6, 0xb0, 0x14,
+	0xa6, 0x5d, 0x02, 0x31, 0x8d, 0x14, 0xb6, 0xd9, 0xff, 0xa3, 0xd7, 0xdb, 0xce, 0xe1, 0xa5, 0xc0,
+	0x83, 0xf6, 0x8a, 0x4e, 0xab, 0x43, 0x27, 0x48, 0x39, 0x21, 0x59, 0x9a, 0x64, 0x5d, 0x6c, 0xf9,
+	0x2f, 0xc3, 0xcb, 0xfb, 0xd2, 0xe1, 0x5c, 0x54, 0x93, 0x41, 0xd9, 0xec, 0xaf, 0x6b, 0x85, 0x1c,
+	0xc3, 0x2b, 0xd5, 0xf3, 0xb7, 0x7a, 0x53, 0x4f, 0x3a, 0x6e, 0x90, 0x65, 0xac, 0x87, 0xed, 0xf8,
+	0x55, 0x28, 0x38, 0x7f, 0x38, 0x17, 0xa1, 0x0b, 0x36, 0xf8, 0x27, 0xc8, 0x0a, 0x6a, 0x54, 0x7b,
+	0xff, 0x9d, 0xbc, 0x54, 0x38, 0x9c, 0x8b, 0x30, 0x55, 0xf5, 0x76, 0xa3, 0x52, 0x9d, 0xfd, 0xf7,
+	0xa0, 0xaa, 0x1b, 0x95, 0x6a, 0xeb, 0xb6, 0x9f, 0x08, 0xd9, 0x6b, 0x20, 0xaa, 0xd8, 0x7e, 0x22,
+	0x74, 0xfd, 0x44, 0xc8, 0x1e, 0x80, 0x88, 0x3a, 0x7e, 0xb6, 0x4a, 0xb5, 0xf2, 0x3f, 0x80, 0xaa,
+	0xea, 0xf8, 0xc9, 0xd3, 0xc7, 0xaa, 0xaa, 0xa5, 0xfb, 0xf2, 0x1f, 0x41, 0xd7, 0x38, 0x9c, 0x8b,
+	0xea, 0x58, 0xad, 0x6b, 0x4e, 0x4a, 0x18, 0x30, 0x0d, 0xfc, 0x4f, 0x20, 0x5c, 0x3c, 0x9c, 0x8b,
+	0xd0, 0x47, 0x77, 0x6f, 0x33, 0x03, 0xec, 0xdd, 0x7f, 0x06, 0x95, 0x6f, 0x66, 0x80, 0x5d, 0xbb,
+	0xe4, 0x2a, 0x42, 0xf6, 0x17, 0x90, 0x35, 0x4b, 0xae, 0x22, 0x2c, 0xb9, 0x8a, 0x90, 0xfd, 0x15,
+	0x84, 0x0b, 0xae, 0xab, 0x3d, 0x5b, 0xd5, 0xa9, 0xff, 0x06, 0x32, 0xcf, 0xcc, 0x56, 0x75, 0xe8,
+	0x62, 0xe5, 0xb0, 0x47, 0xfe, 0x1d, 0x54, 0xb5, 0x62, 0xe5, 0xb0, 0x3b, 0x9a, 0x19, 0x60, 0x5b,
+	0xfc, 0x07, 0x88, 0x56, 0xcc, 0x0c, 0xb0, 0x21, 0x7e, 0x44, 0x8f, 0x4b, 0x1f, 0x9b, 0xfe, 0x59,
+	0xbd, 0xd0, 0x6d, 0x81, 0x99, 0x88, 0x46, 0xe9, 0x96, 0xda, 0xc0, 0x78, 0x64, 0xfa, 0x57, 0x55,
+	0x5e, 0x15, 0xb4, 0xce, 0x7c, 0x55, 0x00, 0xa9, 0xf2, 0xbc, 0x64, 0xc6, 0x8b, 0xc7, 0xa5, 0x67,
+	0xc8, 0x1a, 0x8e, 0x77, 0x10, 0x8f, 0x7b, 0xc9, 0x24, 0x3f, 0xce, 0xe3, 0x1e, 0x7b, 0xf8, 0xf0,
+	0xe1, 0x43, 0x4f, 0x6d, 0xe8, 0x86, 0xfc, 0xfa, 0xfd, 0xf8, 0xed, 0xcd, 0xb8, 0x47, 0x1f, 0xd7,
+	0xab, 0x90, 0xdf, 0xcb, 0x8e, 0xb7, 0xd9, 0x4b, 0xf3, 0x52, 0xe8, 0x29, 0x38, 0x6e, 0xde, 0xcb,
+	0xb6, 0x5d, 0x49, 0x8b, 0x7d, 0x77, 0x5e, 0x6e, 0x56, 0x4b, 0xd2, 0xba, 0x2c, 0x48, 0xdd, 0xb9,
+	0xbe, 0x70, 0xee, 0x63, 0x70, 0x8e, 0xeb, 0xf2, 0xde, 0xc6, 0x5c, 0x6b, 0x48, 0x19, 0xe4, 0x39,
+	0xef, 0x60, 0xce, 0x4b, 0x25, 0xe6, 0xdd, 0x93, 0x2f, 0x9f, 0xe6, 0xdd, 0x0c, 0xf3, 0xf6, 0x20,
+	0xcf, 0x3a, 0x36, 0x3a, 0x47, 0x61, 0xcc, 0x7b, 0x15, 0xcf, 0xcc, 0xe6, 0x3c, 0x89, 0x89, 0xef,
+	0x22, 0x74, 0xb6, 0xab, 0xd2, 0x26, 0xa9, 0xbc, 0x90, 0xdc, 0x97, 0xd7, 0x98, 0xf3, 0x11, 0xfc,
+	0x4b, 0x1f, 0x23, 0xf3, 0x77, 0xe3, 0xc1, 0x34, 0x91, 0xb7, 0x96, 0x95, 0x08, 0x3f, 0xb4, 0xfd,
+	0x67, 0xbd, 0xcb, 0x39, 0xb9, 0xf4, 0xc8, 0x7e, 0x69, 0x17, 0xa9, 0x61, 0x91, 0x03, 0xbb, 0xc8,
+	0x05, 0xce, 0xda, 0x96, 0x6b, 0x46, 0xd6, 0x1f, 0xd1, 0x39, 0x6d, 0xcf, 0x05, 0xf4, 0xdc, 0xb7,
+	0x3d, 0xcf, 0xfb, 0x1a, 0x6a, 0x19, 0x3e, 0x47, 0x48, 0xb1, 0xcb, 0xe4, 0x45, 0xa0, 0xdc, 0x02,
+	0x72, 0x6d, 0x8f, 0xe5, 0xcd, 0x31, 0xfb, 0xb7, 0xc4, 0x4a, 0x6d, 0x29, 0xa9, 0x93, 0x55, 0x2f,
+	0xd7, 0xc8, 0xa2, 0xaa, 0xba, 0xf1, 0x46, 0x52, 0x95, 0xfd, 0x75, 0x89, 0x54, 0x6f, 0x1f, 0x44,
+	0x37, 0x9a, 0x73, 0x74, 0x91, 0xc0, 0x19, 0xbb, 0xe9, 0xed, 0xd7, 0x4d, 0x03, 0x81, 0xa4, 0xfd,
+	0x65, 0x52, 0x33, 0x9b, 0x6c, 0xff, 0xdd, 0xb7, 0xdf, 0xd9, 0xeb, 0xe7, 0x77, 0xa6, 0x27, 0x9b,
+	0xa7, 0xd9, 0x70, 0xab, 0x97, 0x0d, 0xe2, 0xb4, 0xb7, 0x25, 0x47, 0x7e, 0x32, 0xed, 0x6e, 0xdd,
+	0x6d, 0x6d, 0x9d, 0x0e, 0x3b, 0xf8, 0xf9, 0xf4, 0x6a, 0x2f, 0x49, 0xaf, 0xf6, 0xb2, 0xad, 0x3c,
+	0x99, 0xe4, 0x9d, 0x38, 0x8f, 0x31, 0xdc, 0x7a, 0x3d, 0x00, 0x00, 0xff, 0xff, 0x50, 0xd6, 0x5a,
+	0xc4, 0xe5, 0x16, 0x00, 0x00,
 }
diff --git a/cmd/protoc-gen-go/testdata/proto2/fields.proto b/cmd/protoc-gen-go/testdata/proto2/fields.proto
index f5d5fd4..45bd989 100644
--- a/cmd/protoc-gen-go/testdata/proto2/fields.proto
+++ b/cmd/protoc-gen-go/testdata/proto2/fields.proto
@@ -86,8 +86,8 @@
   optional sfixed64 default_sfixed64 = 312 [default=1];
   optional fixed64  default_fixed64  = 313 [default=1];
   optional double   default_double   = 314 [default=3.1415];
-  optional string   default_string   = 315 [default="x,y"];
-  optional bytes    default_bytes    = 316 [default="x,y"];
+  optional string   default_string   = 315 [default="hello,\"world!\"\n"];
+  optional bytes    default_bytes    = 316 [default="hello,\xde\xad\xbe\xef"];
 
   optional string default_zero_string = 350 [default=""];
   optional bytes  default_zero_bytes  = 351 [default=""];