15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2011 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 55821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/win/enum_variant.h" 65821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <algorithm> 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/logging.h" 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace base { 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace win { 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)EnumVariant::EnumVariant(unsigned long count) 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : items_(new VARIANT[count]), 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) count_(count), 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) current_index_(0) { 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)EnumVariant::~EnumVariant() { 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)VARIANT* EnumVariant::ItemAt(unsigned long index) { 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DCHECK(index < count_); 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return &items_[index]; 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)ULONG STDMETHODCALLTYPE EnumVariant::AddRef() { 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IUnknownImpl::AddRef(); 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)ULONG STDMETHODCALLTYPE EnumVariant::Release() { 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IUnknownImpl::Release(); 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)STDMETHODIMP EnumVariant::QueryInterface(REFIID riid, void** ppv) { 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (riid == IID_IEnumVARIANT) { 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *ppv = static_cast<IEnumVARIANT*>(this); 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddRef(); 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return S_OK; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return IUnknownImpl::QueryInterface(riid, ppv); 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)STDMETHODIMP EnumVariant::Next(ULONG requested_count, 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) VARIANT* out_elements, 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ULONG* out_elements_received) { 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned long count = std::min(requested_count, count_ - current_index_); 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) for (unsigned long i = 0; i < count; ++i) 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) out_elements[i] = items_[current_index_ + i]; 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) current_index_ += count; 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *out_elements_received = count; 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (count == requested_count ? S_OK : S_FALSE); 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)STDMETHODIMP EnumVariant::Skip(ULONG skip_count) { 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) unsigned long count = skip_count; 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (current_index_ + count > count_) 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) count = count_ - current_index_; 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) current_index_ += count; 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (count == skip_count ? S_OK : S_FALSE); 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)STDMETHODIMP EnumVariant::Reset() { 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) current_index_ = 0; 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return S_OK; 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)STDMETHODIMP EnumVariant::Clone(IEnumVARIANT** out_cloned_object) { 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) EnumVariant* other = new EnumVariant(count_); 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (count_ > 0) 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memcpy(other->ItemAt(0), &items_[0], count_ * sizeof(VARIANT)); 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) other->Skip(current_index_); 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) other->AddRef(); 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *out_cloned_object = other; 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return S_OK; 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace win 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace base 84