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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/logging.h"
namespace base {
namespace win {
ScopedBstr::ScopedBstr(const char16* non_bstr)
: bstr_(SysAllocString(non_bstr)) {
}
ScopedBstr::~ScopedBstr() {
static_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_) << "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_t* data = reinterpret_cast<uint32_t*>(bstr_);
data[-1] = static_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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