Add MinidumpContext (X86 and AMD64 variants) and their writers

minidump/minidump_context_writer.cc

Index: minidump/minidump_context_writer.cc
diff --git a/minidump/minidump_context_writer.cc b/minidump/minidump_context_writer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3bbd4a4f10028ac4ecfd5bd82984073f24806347
--- /dev/null
+++ b/minidump/minidump_context_writer.cc
@@ -0,0 +1,77 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// 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.
+
+#include "minidump/minidump_context_writer.h"
+
+#include "base/logging.h"
+
+namespace crashpad {
+
+MinidumpContextWriter::~MinidumpContextWriter() {
+}
+
+size_t MinidumpContextWriter::SizeOfObject() {
+  DCHECK_GE(state(), kStateFrozen);
+
+  return ContextSize();
+}
+
+MinidumpContextX86Writer::MinidumpContextX86Writer()
+    : MinidumpContextWriter(), context_() {
+  context_.context_flags = kMinidumpContextX86;
+}
+
+MinidumpContextX86Writer::~MinidumpContextX86Writer() {
+}
+
+bool MinidumpContextX86Writer::WriteObject(FileWriterInterface* file_writer) {
+  DCHECK_EQ(state(), kStateWritable);
+
+  return file_writer->Write(&context_, sizeof(context_));
+}
+
+size_t MinidumpContextX86Writer::ContextSize() const {
+  DCHECK_GE(state(), kStateFrozen);
+
+  return sizeof(context_);
+}
+
+MinidumpContextAMD64Writer::MinidumpContextAMD64Writer()
+    : MinidumpContextWriter(), context_() {
+  context_.context_flags = kMinidumpContextAMD64;
+}
+
+MinidumpContextAMD64Writer::~MinidumpContextAMD64Writer() {
+}
+
+size_t MinidumpContextAMD64Writer::Alignment() {
+  DCHECK_GE(state(), kStateFrozen);
+
+  // Match the alignment of MinidumpContextAMD64.
+  return 16;
+}
+
+bool MinidumpContextAMD64Writer::WriteObject(FileWriterInterface* file_writer) {
+  DCHECK_EQ(state(), kStateWritable);
+
+  return file_writer->Write(&context_, sizeof(context_));
+}
+
+size_t MinidumpContextAMD64Writer::ContextSize() const {
+  DCHECK_GE(state(), kStateFrozen);
+
+  return sizeof(context_);
+}
+
+}  // namespace crashpad