// Copyright 2014 PDFium 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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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fxcrt/include/fx_basic.h"
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#include "core/fxcrt/plex.h"
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CFX_MapPtrToPtr::CFX_MapPtrToPtr(int nBlockSize)
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: m_pHashTable(nullptr),
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m_nHashTableSize(17),
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m_nCount(0),
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m_pFreeList(nullptr),
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m_pBlocks(nullptr),
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m_nBlockSize(nBlockSize) {
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ASSERT(m_nBlockSize > 0);
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}
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void CFX_MapPtrToPtr::RemoveAll() {
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FX_Free(m_pHashTable);
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m_pHashTable = nullptr;
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m_nCount = 0;
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m_pFreeList = nullptr;
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if (m_pBlocks) {
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m_pBlocks->FreeDataChain();
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m_pBlocks = nullptr;
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}
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}
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CFX_MapPtrToPtr::~CFX_MapPtrToPtr() {
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RemoveAll();
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ASSERT(m_nCount == 0);
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}
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uint32_t CFX_MapPtrToPtr::HashKey(void* key) const {
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return ((uint32_t)(uintptr_t)key) >> 4;
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}
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void CFX_MapPtrToPtr::GetNextAssoc(FX_POSITION& rNextPosition,
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void*& rKey,
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void*& rValue) const {
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ASSERT(m_pHashTable);
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CAssoc* pAssocRet = (CAssoc*)rNextPosition;
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ASSERT(pAssocRet);
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if (pAssocRet == (CAssoc*)-1) {
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for (uint32_t nBucket = 0; nBucket < m_nHashTableSize; nBucket++) {
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pAssocRet = m_pHashTable[nBucket];
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if (pAssocRet)
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break;
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}
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ASSERT(pAssocRet);
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}
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CAssoc* pAssocNext = pAssocRet->pNext;
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for (uint32_t nBucket = (HashKey(pAssocRet->key) % m_nHashTableSize) + 1;
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nBucket < m_nHashTableSize && !pAssocNext; nBucket++) {
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pAssocNext = m_pHashTable[nBucket];
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}
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rNextPosition = (FX_POSITION)pAssocNext;
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rKey = pAssocRet->key;
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rValue = pAssocRet->value;
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}
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FX_BOOL CFX_MapPtrToPtr::Lookup(void* key, void*& rValue) const {
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uint32_t nHash;
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CAssoc* pAssoc = GetAssocAt(key, nHash);
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if (!pAssoc) {
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return FALSE;
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}
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rValue = pAssoc->value;
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return TRUE;
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}
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void* CFX_MapPtrToPtr::GetValueAt(void* key) const {
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uint32_t nHash;
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CAssoc* pAssoc = GetAssocAt(key, nHash);
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return pAssoc ? pAssoc->value : nullptr;
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}
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void*& CFX_MapPtrToPtr::operator[](void* key) {
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uint32_t nHash;
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CAssoc* pAssoc = GetAssocAt(key, nHash);
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if (!pAssoc) {
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if (!m_pHashTable)
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InitHashTable(m_nHashTableSize);
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pAssoc = NewAssoc();
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pAssoc->key = key;
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pAssoc->pNext = m_pHashTable[nHash];
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m_pHashTable[nHash] = pAssoc;
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}
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return pAssoc->value;
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}
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CFX_MapPtrToPtr::CAssoc* CFX_MapPtrToPtr::GetAssocAt(void* key,
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uint32_t& nHash) const {
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nHash = HashKey(key) % m_nHashTableSize;
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if (!m_pHashTable) {
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return nullptr;
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}
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CAssoc* pAssoc;
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for (pAssoc = m_pHashTable[nHash]; pAssoc; pAssoc = pAssoc->pNext) {
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if (pAssoc->key == key)
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return pAssoc;
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}
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return nullptr;
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}
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CFX_MapPtrToPtr::CAssoc* CFX_MapPtrToPtr::NewAssoc() {
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if (!m_pFreeList) {
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CFX_Plex* newBlock = CFX_Plex::Create(m_pBlocks, m_nBlockSize,
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sizeof(CFX_MapPtrToPtr::CAssoc));
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CFX_MapPtrToPtr::CAssoc* pAssoc =
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(CFX_MapPtrToPtr::CAssoc*)newBlock->data();
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pAssoc += m_nBlockSize - 1;
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for (int i = m_nBlockSize - 1; i >= 0; i--, pAssoc--) {
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pAssoc->pNext = m_pFreeList;
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m_pFreeList = pAssoc;
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}
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}
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CFX_MapPtrToPtr::CAssoc* pAssoc = m_pFreeList;
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m_pFreeList = m_pFreeList->pNext;
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m_nCount++;
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ASSERT(m_nCount > 0);
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pAssoc->key = 0;
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pAssoc->value = 0;
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return pAssoc;
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}
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void CFX_MapPtrToPtr::InitHashTable(uint32_t nHashSize, FX_BOOL bAllocNow) {
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ASSERT(m_nCount == 0);
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ASSERT(nHashSize > 0);
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FX_Free(m_pHashTable);
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m_pHashTable = nullptr;
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if (bAllocNow) {
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m_pHashTable = FX_Alloc(CAssoc*, nHashSize);
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}
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m_nHashTableSize = nHashSize;
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}
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FX_BOOL CFX_MapPtrToPtr::RemoveKey(void* key) {
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if (!m_pHashTable) {
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return FALSE;
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}
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CAssoc** ppAssocPrev;
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ppAssocPrev = &m_pHashTable[HashKey(key) % m_nHashTableSize];
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CAssoc* pAssoc;
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for (pAssoc = *ppAssocPrev; pAssoc; pAssoc = pAssoc->pNext) {
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if (pAssoc->key == key) {
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*ppAssocPrev = pAssoc->pNext;
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FreeAssoc(pAssoc);
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return TRUE;
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}
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ppAssocPrev = &pAssoc->pNext;
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}
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return FALSE;
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}
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void CFX_MapPtrToPtr::FreeAssoc(CFX_MapPtrToPtr::CAssoc* pAssoc) {
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pAssoc->pNext = m_pFreeList;
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m_pFreeList = pAssoc;
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m_nCount--;
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ASSERT(m_nCount >= 0);
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if (m_nCount == 0) {
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RemoveAll();
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}
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}
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