1 files changed, 83 insertions, 0 deletions
diff --git a/tools/go_marshal/test/dynamic.go b/tools/go_marshal/test/dynamic.go
new file mode 100644
index 000000000..9a812efe9
--- /dev/null
+++ b/tools/go_marshal/test/dynamic.go
@@ -0,0 +1,83 @@
+// Copyright 2021 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package test
+
+import "gvisor.dev/gvisor/pkg/marshal/primitive"
+
+// Type12Dynamic is a dynamically sized struct which depends on the
+// autogenerator to generate some Marshallable methods for it.
+//
+// +marshal dynamic
+type Type12Dynamic struct {
+	X primitive.Int64
+	Y []primitive.Int64
+}
+
+// SizeBytes implements marshal.Marshallable.SizeBytes.
+func (t *Type12Dynamic) SizeBytes() int {
+	return (len(t.Y) * 8) + t.X.SizeBytes()
+}
+
+// MarshalBytes implements marshal.Marshallable.MarshalBytes.
+func (t *Type12Dynamic) MarshalBytes(dst []byte) {
+	t.X.MarshalBytes(dst)
+	dst = dst[t.X.SizeBytes():]
+	for i, x := range t.Y {
+		x.MarshalBytes(dst[i*8 : (i+1)*8])
+	}
+}
+
+// UnmarshalBytes implements marshal.Marshallable.UnmarshalBytes.
+func (t *Type12Dynamic) UnmarshalBytes(src []byte) {
+	t.X.UnmarshalBytes(src)
+	if t.Y != nil {
+		t.Y = t.Y[:0]
+	}
+	for i := t.X.SizeBytes(); i < len(src); i += 8 {
+		var x primitive.Int64
+		x.UnmarshalBytes(src[i:])
+		t.Y = append(t.Y, x)
+	}
+}
+
+// Type13Dynamic is a dynamically sized struct which depends on the
+// autogenerator to generate some Marshallable methods for it.
+//
+// It represents a string in memory which is preceded by a uint32 indicating
+// the string size.
+//
+// +marshal dynamic
+type Type13Dynamic string
+
+// SizeBytes implements marshal.Marshallable.SizeBytes.
+func (t *Type13Dynamic) SizeBytes() int {
+	return (*primitive.Uint32)(nil).SizeBytes() + len(*t)
+}
+
+// MarshalBytes implements marshal.Marshallable.MarshalBytes.
+func (t *Type13Dynamic) MarshalBytes(dst []byte) {
+	strLen := primitive.Uint32(len(*t))
+	strLen.MarshalBytes(dst)
+	dst = dst[strLen.SizeBytes():]
+	copy(dst[:strLen], *t)
+}
+
+// UnmarshalBytes implements marshal.Marshallable.UnmarshalBytes.
+func (t *Type13Dynamic) UnmarshalBytes(src []byte) {
+	var strLen primitive.Uint32
+	strLen.UnmarshalBytes(src)
+	src = src[strLen.SizeBytes():]
+	*t = Type13Dynamic(src[:strLen])
+}