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// Copyright 2010 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40284755): Remove this and spanify to fix the errors.
#pragma allow_unsafe_buffers
#endif
#include "base/win/scoped_bstr.h"
#include <stdint.h>
#include <string_view>
#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(std::wstring_view 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(std::wstring_view 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(std::wstring_view 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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