1// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/scoped_bstr_win.h"
6
7#include "base/logging.h"
8
9
10ScopedBstr::ScopedBstr(const wchar_t* non_bstr)
11    : bstr_(SysAllocString(non_bstr)) {
12}
13
14ScopedBstr::~ScopedBstr() {
15  COMPILE_ASSERT(sizeof(ScopedBstr) == sizeof(BSTR), ScopedBstrSize);
16  SysFreeString(bstr_);
17}
18
19void ScopedBstr::Reset(BSTR bstr) {
20  if (bstr != bstr_) {
21    // if |bstr_| is NULL, SysFreeString does nothing.
22    SysFreeString(bstr_);
23    bstr_ = bstr;
24  }
25}
26
27BSTR ScopedBstr::Release() {
28  BSTR bstr = bstr_;
29  bstr_ = NULL;
30  return bstr;
31}
32
33void ScopedBstr::Swap(ScopedBstr& bstr2) {
34  BSTR tmp = bstr_;
35  bstr_ = bstr2.bstr_;
36  bstr2.bstr_ = tmp;
37}
38
39BSTR* ScopedBstr::Receive() {
40  DCHECK(bstr_ == NULL) << "BSTR leak.";
41  return &bstr_;
42}
43
44BSTR ScopedBstr::Allocate(const wchar_t* wide_str) {
45  Reset(SysAllocString(wide_str));
46  return bstr_;
47}
48
49BSTR ScopedBstr::AllocateBytes(int bytes) {
50  Reset(SysAllocStringByteLen(NULL, bytes));
51  return bstr_;
52}
53
54void ScopedBstr::SetByteLen(uint32 bytes) {
55  DCHECK(bstr_ != NULL) << "attempting to modify a NULL bstr";
56  uint32* data = reinterpret_cast<uint32*>(bstr_);
57  data[-1] = bytes;
58}
59
60uint32 ScopedBstr::Length() const {
61  return SysStringLen(bstr_);
62}
63
64uint32 ScopedBstr::ByteLength() const {
65  return SysStringByteLen(bstr_);
66}
67