1 files changed, 71 insertions, 0 deletions
diff --git a/base/win/scoped_bstr.cc b/base/win/scoped_bstr.cc
new file mode 100644
index 0000000..18ffe6a
--- /dev/null
+++ b/base/win/scoped_bstr.cc
@@ -0,0 +1,71 @@
+// Copyright (c) 2010 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.
+
+#include "base/win/scoped_bstr.h"
+
+#include "base/logging.h"
+
+namespace base {
+namespace win {
+
+ScopedBstr::ScopedBstr(const char16* non_bstr)
+    : bstr_(SysAllocString(non_bstr)) {
+}
+
+ScopedBstr::~ScopedBstr() {
+  COMPILE_ASSERT(sizeof(ScopedBstr) == sizeof(BSTR), ScopedBstrSize);
+  SysFreeString(bstr_);
+}
+
+void ScopedBstr::Reset(BSTR bstr) {
+  if (bstr != bstr_) {
+    // if |bstr_| is NULL, SysFreeString does nothing.
+    SysFreeString(bstr_);
+    bstr_ = bstr;
+  }
+}
+
+BSTR ScopedBstr::Release() {
+  BSTR bstr = bstr_;
+  bstr_ = NULL;
+  return bstr;
+}
+
+void ScopedBstr::Swap(ScopedBstr& bstr2) {
+  BSTR tmp = bstr_;
+  bstr_ = bstr2.bstr_;
+  bstr2.bstr_ = tmp;
+}
+
+BSTR* ScopedBstr::Receive() {
+  DCHECK(bstr_ == NULL) << "BSTR leak.";
+  return &bstr_;
+}
+
+BSTR ScopedBstr::Allocate(const char16* str) {
+  Reset(SysAllocString(str));
+  return bstr_;
+}
+
+BSTR ScopedBstr::AllocateBytes(size_t bytes) {
+  Reset(SysAllocStringByteLen(NULL, static_cast<UINT>(bytes)));
+  return bstr_;
+}
+
+void ScopedBstr::SetByteLen(size_t bytes) {
+  DCHECK(bstr_ != NULL) << "attempting to modify a NULL bstr";
+  uint32* data = reinterpret_cast<uint32*>(bstr_);
+  data[-1] = static_cast<uint32>(bytes);
+}
+
+size_t ScopedBstr::Length() const {
+  return SysStringLen(bstr_);
+}
+
+size_t ScopedBstr::ByteLength() const {
+  return SysStringByteLen(bstr_);
+}
+
+}  // namespace win
+}  // namespace base