84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
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// Copyright (c) 2011 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/enum_variant.h"
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#include <algorithm>
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#include "base/logging.h"
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namespace base {
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namespace win {
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EnumVariant::EnumVariant(unsigned long count)
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: items_(new VARIANT[count]),
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count_(count),
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current_index_(0) {
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}
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EnumVariant::~EnumVariant() {
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}
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VARIANT* EnumVariant::ItemAt(unsigned long index) {
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DCHECK(index < count_);
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return &items_[index];
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}
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ULONG STDMETHODCALLTYPE EnumVariant::AddRef() {
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return IUnknownImpl::AddRef();
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}
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ULONG STDMETHODCALLTYPE EnumVariant::Release() {
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return IUnknownImpl::Release();
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}
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STDMETHODIMP EnumVariant::QueryInterface(REFIID riid, void** ppv) {
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if (riid == IID_IEnumVARIANT) {
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*ppv = static_cast<IEnumVARIANT*>(this);
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AddRef();
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return S_OK;
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}
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return IUnknownImpl::QueryInterface(riid, ppv);
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}
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STDMETHODIMP EnumVariant::Next(ULONG requested_count,
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VARIANT* out_elements,
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ULONG* out_elements_received) {
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unsigned long count = std::min(requested_count, count_ - current_index_);
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for (unsigned long i = 0; i < count; ++i)
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out_elements[i] = items_[current_index_ + i];
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current_index_ += count;
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*out_elements_received = count;
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return (count == requested_count ? S_OK : S_FALSE);
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}
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STDMETHODIMP EnumVariant::Skip(ULONG skip_count) {
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unsigned long count = skip_count;
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if (current_index_ + count > count_)
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count = count_ - current_index_;
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current_index_ += count;
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return (count == skip_count ? S_OK : S_FALSE);
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}
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STDMETHODIMP EnumVariant::Reset() {
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current_index_ = 0;
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return S_OK;
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}
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STDMETHODIMP EnumVariant::Clone(IEnumVARIANT** out_cloned_object) {
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EnumVariant* other = new EnumVariant(count_);
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if (count_ > 0)
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memcpy(other->ItemAt(0), &items_[0], count_ * sizeof(VARIANT));
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other->Skip(current_index_);
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other->AddRef();
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*out_cloned_object = other;
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return S_OK;
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}
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} // namespace win
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} // namespace base
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