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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#include "core/fxcrt/fx_basic.h"
#include "core/fxcrt/plex.h"
CFX_PtrList::CFX_PtrList(int nBlockSize)
: m_pNodeHead(nullptr),
m_pNodeTail(nullptr),
m_nCount(0),
m_pNodeFree(nullptr),
m_pBlocks(nullptr),
m_nBlockSize(nBlockSize) {}
FX_POSITION CFX_PtrList::AddTail(void* newElement) {
CNode* pNewNode = NewNode(m_pNodeTail, nullptr);
pNewNode->data = newElement;
if (m_pNodeTail) {
m_pNodeTail->pNext = pNewNode;
} else {
m_pNodeHead = pNewNode;
}
m_pNodeTail = pNewNode;
return (FX_POSITION)pNewNode;
}
FX_POSITION CFX_PtrList::AddHead(void* newElement) {
CNode* pNewNode = NewNode(nullptr, m_pNodeHead);
pNewNode->data = newElement;
if (m_pNodeHead) {
m_pNodeHead->pPrev = pNewNode;
} else {
m_pNodeTail = pNewNode;
}
m_pNodeHead = pNewNode;
return (FX_POSITION)pNewNode;
}
FX_POSITION CFX_PtrList::InsertAfter(FX_POSITION position, void* newElement) {
if (!position) {
return AddTail(newElement);
}
CNode* pOldNode = (CNode*)position;
CNode* pNewNode = NewNode(pOldNode, pOldNode->pNext);
pNewNode->data = newElement;
if (pOldNode->pNext) {
pOldNode->pNext->pPrev = pNewNode;
} else {
m_pNodeTail = pNewNode;
}
pOldNode->pNext = pNewNode;
return (FX_POSITION)pNewNode;
}
void CFX_PtrList::RemoveAt(FX_POSITION position) {
CNode* pOldNode = (CNode*)position;
if (pOldNode == m_pNodeHead) {
m_pNodeHead = pOldNode->pNext;
} else {
pOldNode->pPrev->pNext = pOldNode->pNext;
}
if (pOldNode == m_pNodeTail) {
m_pNodeTail = pOldNode->pPrev;
} else {
pOldNode->pNext->pPrev = pOldNode->pPrev;
}
FreeNode(pOldNode);
}
void CFX_PtrList::FreeNode(CFX_PtrList::CNode* pNode) {
pNode->pNext = m_pNodeFree;
m_pNodeFree = pNode;
m_nCount--;
if (m_nCount == 0) {
RemoveAll();
}
}
void CFX_PtrList::RemoveAll() {
m_nCount = 0;
m_pNodeHead = nullptr;
m_pNodeTail = nullptr;
m_pNodeFree = nullptr;
if (m_pBlocks) {
m_pBlocks->FreeDataChain();
m_pBlocks = nullptr;
}
}
CFX_PtrList::CNode* CFX_PtrList::NewNode(CFX_PtrList::CNode* pPrev,
CFX_PtrList::CNode* pNext) {
if (!m_pNodeFree) {
CFX_Plex* pNewBlock =
CFX_Plex::Create(m_pBlocks, m_nBlockSize, sizeof(CNode));
CNode* pNode = (CNode*)pNewBlock->data();
pNode += m_nBlockSize - 1;
for (int i = m_nBlockSize - 1; i >= 0; i--, pNode--) {
pNode->pNext = m_pNodeFree;
m_pNodeFree = pNode;
}
}
CFX_PtrList::CNode* pNode = m_pNodeFree;
m_pNodeFree = m_pNodeFree->pNext;
pNode->pPrev = pPrev;
pNode->pNext = pNext;
m_nCount++;
ASSERT(m_nCount > 0);
pNode->data = 0;
return pNode;
}
CFX_PtrList::~CFX_PtrList() {
RemoveAll();
ASSERT(m_nCount == 0);
}
FX_POSITION CFX_PtrList::FindIndex(int nIndex) const {
if (nIndex >= m_nCount || nIndex < 0) {
return nullptr;
}
CNode* pNode = m_pNodeHead;
while (nIndex--) {
pNode = pNode->pNext;
}
return (FX_POSITION)pNode;
}
FX_POSITION CFX_PtrList::Find(void* searchValue, FX_POSITION startAfter) const {
CNode* pNode = (CNode*)startAfter;
pNode = pNode ? pNode->pNext : m_pNodeHead;
for (; pNode; pNode = pNode->pNext) {
if (pNode->data == searchValue)
return (FX_POSITION)pNode;
}
return nullptr;
}
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