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- // 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 <stdint.h>
- #include "base/check.h"
- #include "base/numerics/safe_conversions.h"
- #include "base/process/memory.h"
- #include "base/strings/string_util.h"
- namespace base {
- namespace win {
- namespace {
- BSTR AllocBstrOrDie(WStringPiece non_bstr) {
- BSTR result = ::SysAllocStringLen(non_bstr.data(),
- checked_cast<UINT>(non_bstr.length()));
- if (!result) {
- base::TerminateBecauseOutOfMemory((non_bstr.length() + 1) *
- sizeof(wchar_t));
- }
- return result;
- }
- BSTR AllocBstrBytesOrDie(size_t bytes) {
- BSTR result = ::SysAllocStringByteLen(nullptr, checked_cast<UINT>(bytes));
- if (!result)
- base::TerminateBecauseOutOfMemory(bytes + sizeof(wchar_t));
- return result;
- }
- } // namespace
- ScopedBstr::ScopedBstr(WStringPiece non_bstr)
- : bstr_(AllocBstrOrDie(non_bstr)) {}
- ScopedBstr::~ScopedBstr() {
- static_assert(sizeof(ScopedBstr) == sizeof(BSTR), "ScopedBstrSize");
- ::SysFreeString(bstr_);
- }
- void ScopedBstr::Reset(BSTR bstr) {
- if (bstr != bstr_) {
- // SysFreeString handles null properly.
- ::SysFreeString(bstr_);
- bstr_ = bstr;
- }
- }
- BSTR ScopedBstr::Release() {
- BSTR bstr = bstr_;
- bstr_ = nullptr;
- return bstr;
- }
- void ScopedBstr::Swap(ScopedBstr& bstr2) {
- BSTR tmp = bstr_;
- bstr_ = bstr2.bstr_;
- bstr2.bstr_ = tmp;
- }
- BSTR* ScopedBstr::Receive() {
- DCHECK(!bstr_) << "BSTR leak.";
- return &bstr_;
- }
- BSTR ScopedBstr::Allocate(WStringPiece str) {
- Reset(AllocBstrOrDie(str));
- return bstr_;
- }
- BSTR ScopedBstr::AllocateBytes(size_t bytes) {
- Reset(AllocBstrBytesOrDie(bytes));
- return bstr_;
- }
- void ScopedBstr::SetByteLen(size_t bytes) {
- DCHECK(bstr_);
- uint32_t* data = reinterpret_cast<uint32_t*>(bstr_);
- data[-1] = checked_cast<uint32_t>(bytes);
- }
- size_t ScopedBstr::Length() const {
- return ::SysStringLen(bstr_);
- }
- size_t ScopedBstr::ByteLength() const {
- return ::SysStringByteLen(bstr_);
- }
- } // namespace win
- } // namespace base
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