C bindings: Implement _DeepCopy() & some unittests.

mojom/generators/c/templates/struct.tmpl.go

 // Copyright 2016 The Chromium 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 templates
 
 const GenerateStructDeclarations = `
 {{- /* . (dot) refers to the Go type |cgen.StructTemplate| */ -}}
 {{define "GenerateStructDeclarations" -}}
 {{- $struct := . -}}
@@ skipping 20 matching lines @@
 struct {{$struct.Name}}* {{$struct.Name}}_New(struct MojomBuffer* in_buffer);
 
 void {{$struct.Name}}_Init(
   struct {{$struct.Name}}* in_data);
 
 void {{$struct.Name}}_CloseAllHandles(
   struct {{$struct.Name}}* in_data);
 
 struct {{$struct.Name}}* {{$struct.Name}}_DeepCopy(
   struct MojomBuffer* in_buffer,
-  struct {{$struct.Name}}* in_data);
+  struct {{$struct.Name}}* in_struct);
 
 size_t {{$struct.Name}}_ComputeSerializedSize(
   const struct {{$struct.Name}}* in_data);
 
 void {{$struct.Name}}_EncodePointersAndHandles(
   struct {{$struct.Name}}* inout_struct, uint32_t in_struct_size,
   struct MojomHandleBuffer* inout_handle_buffer);
 
 void {{$struct.Name}}_DecodePointersAndHandles(
   struct {{$struct.Name}}* inout_struct, uint32_t in_struct_size,
   MojoHandle inout_handles[], uint32_t in_num_handles);
 
 MojomValidationResult {{$struct.Name}}_Validate(
   const struct {{$struct.Name}}* in_struct, uint32_t in_struct_size,
   uint32_t in_num_handles);
 
 {{end}}
 `
 
 // TODO(vardhan): Move other struct constant definitions in here.
 const GenerateStructDefinitions = `
 {{- /* . (dot) refers to the Go type |cgen.StructTemplate| */ -}}
 {{define "GenerateStructDefinitions" -}}
 {{- $struct := . -}}
 
 {{range $const := $struct.Constants -}}
 const {{$const.Type}} {{$const.Name}} = {{$const.Value}};
 {{end -}}
 
+struct {{$struct.Name}}* {{$struct.Name}}_DeepCopy(
+  struct MojomBuffer* in_buffer,
+  struct {{$struct.Name}}* in_struct) {
+  struct {{$struct.Name}}* out_struct = NULL;
+  if (!MojomStruct_DeepCopy(
+      in_buffer, &{{$struct.Name}}__TypeDesc,
+      (struct MojomStructHeader*)in_struct,
+      (struct MojomStructHeader**)&out_struct)) {
+    return NULL;
+  }
+  return out_struct;
+}
+
 size_t {{$struct.Name}}_ComputeSerializedSize(
     const struct {{$struct.Name}}* in_data) {
   return MojomStruct_ComputeSerializedSize(
     &{{$struct.Name}}__TypeDesc,
                 (const struct MojomStructHeader*)in_data);
 }
 
 void {{$struct.Name}}_EncodePointersAndHandles(
   struct {{$struct.Name}}* inout_struct, uint32_t in_struct_size,
   struct MojomHandleBuffer* inout_handle_buffer) {
@@ skipping 20 matching lines @@
     .next_pointer = (char*)in_struct + in_struct->header_.num_bytes,
   };
   return MojomStruct_Validate(
     &{{$struct.Name}}__TypeDesc,
     (struct MojomStructHeader*)in_struct, in_struct_size, in_num_handles,
     &context);
 }
 
 {{end}}
 `