Issue619safer (#627)

* tests. added test case for issue (#619). Compare marshaling between a proto.Buffer and proto.Marshal with different proto.Buffer sizes.

* proto/buffer. added buffer cap adjustment before giving it to marshal. This allows us to marshal at the correct place when the buffer contains a larger backing buffer. (#619)

* proto/buffer. remove unsafe/reflect slice cap adjustment and rather use a full slice expression

* proto/buffer. encode. add issue620 tests here

* proto/buffer encode. removed  unnecessary slicing. (#619)

* proto/buffer.  err check previously ignored error

* issue619. add test package to make regenerate list

Makefile

@@ -137,6 +137,8 @@ regenerate:
 	make -C test/issue503 regenerate
 	make -C test/issue530 regenerate
 	make -C test/issue617 regenerate
+	make -C test/issue620 regenerate
+	make -C test/protobuffer regenerate
 	make -C test/issue630 regenerate
 
 	make gofmt

proto/encode.go

@@ -189,6 +189,8 @@ type Marshaler interface {
 // prefixed by a varint-encoded length.
 func (p *Buffer) EncodeMessage(pb Message) error {
 	siz := Size(pb)
+	sizVar := SizeVarint(uint64(siz))
+	p.grow(siz + sizVar)
 	p.EncodeVarint(uint64(siz))
 	return p.Marshal(pb)
 }

proto/table_marshal.go

@@ -2969,7 +2969,9 @@ func (p *Buffer) Marshal(pb Message) error {
 	if m, ok := pb.(newMarshaler); ok {
 		siz := m.XXX_Size()
 		p.grow(siz) // make sure buf has enough capacity
-		p.buf, err = m.XXX_Marshal(p.buf, p.deterministic)
+		pp := p.buf[len(p.buf) : len(p.buf) : len(p.buf)+siz]
+		pp, err = m.XXX_Marshal(pp, p.deterministic)
+		p.buf = append(p.buf, pp...)
 		return err
 	}
 	if m, ok := pb.(Marshaler); ok {

test/issue620/Makefile

@@ -0,0 +1,31 @@
+# Protocol Buffers for Go with Gadgets
+#
+# Copyright (c) 2019, The GoGo Authors. All rights reserved.
+# http://github.com/gogo/protobuf
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+regenerate:
+	go install github.com/gogo/protobuf/protoc-gen-gogo
+	protoc --proto_path=../../../../../:../../protobuf/:. --gogo_out=. issue620.proto

test/issue620/issue620.proto

@@ -0,0 +1,44 @@
+// Protocol Buffers for Go with Gadgets
+//
+// Copyright (c) 2019, The GoGo Authors. All rights reserved.
+// http://github.com/gogo/protobuf
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto2";
+
+package issue620;
+
+import "github.com/gogo/protobuf/gogoproto/gogo.proto";
+
+message Bar {
+  optional string Field1 = 1;
+}
+
+message BarFast {
+  option (gogoproto.marshaler) = true;
+  option (gogoproto.sizer) = true;
+  option (gogoproto.equal) = true;
+  optional string Field1 = 1;
+}