72 lines
1.5 KiB
C++
72 lines
1.5 KiB
C++
// Copyright (c) 2010 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/win/scoped_bstr.h"
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#include "base/logging.h"
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namespace base {
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namespace win {
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ScopedBstr::ScopedBstr(const char16* non_bstr)
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: bstr_(SysAllocString(non_bstr)) {
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}
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ScopedBstr::~ScopedBstr() {
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COMPILE_ASSERT(sizeof(ScopedBstr) == sizeof(BSTR), ScopedBstrSize);
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SysFreeString(bstr_);
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}
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void ScopedBstr::Reset(BSTR bstr) {
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if (bstr != bstr_) {
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// if |bstr_| is NULL, SysFreeString does nothing.
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SysFreeString(bstr_);
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bstr_ = bstr;
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}
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}
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BSTR ScopedBstr::Release() {
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BSTR bstr = bstr_;
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bstr_ = NULL;
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return bstr;
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}
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void ScopedBstr::Swap(ScopedBstr& bstr2) {
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BSTR tmp = bstr_;
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bstr_ = bstr2.bstr_;
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bstr2.bstr_ = tmp;
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}
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BSTR* ScopedBstr::Receive() {
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DCHECK(!bstr_) << "BSTR leak.";
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return &bstr_;
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}
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BSTR ScopedBstr::Allocate(const char16* str) {
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Reset(SysAllocString(str));
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return bstr_;
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}
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BSTR ScopedBstr::AllocateBytes(size_t bytes) {
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Reset(SysAllocStringByteLen(NULL, static_cast<UINT>(bytes)));
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return bstr_;
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}
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void ScopedBstr::SetByteLen(size_t bytes) {
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DCHECK(bstr_ != NULL) << "attempting to modify a NULL bstr";
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uint32* data = reinterpret_cast<uint32*>(bstr_);
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data[-1] = static_cast<uint32>(bytes);
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}
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size_t ScopedBstr::Length() const {
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return SysStringLen(bstr_);
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}
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size_t ScopedBstr::ByteLength() const {
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return SysStringByteLen(bstr_);
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}
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} // namespace win
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} // namespace base
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