CFX_MapByteStringToPtr considered harmful.

core/src/fxcrt/fx_basic_maps.cpp

 // 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 "../../include/fxcrt/fx_basic.h"
 #include "plex.h"
 
-static void ConstructElement(CFX_ByteString* pNewData) {
-  new (pNewData) CFX_ByteString();
-}
-static void DestructElement(CFX_ByteString* pOldData) {
-  pOldData->~CFX_ByteString();
-}
 CFX_MapPtrToPtr::CFX_MapPtrToPtr(int nBlockSize)
     : m_pHashTable(NULL),
       m_nHashTableSize(17),
       m_nCount(0),
       m_pFreeList(NULL),
       m_pBlocks(NULL),
       m_nBlockSize(nBlockSize) {
   ASSERT(m_nBlockSize > 0);
 }
 void CFX_MapPtrToPtr::RemoveAll() {
@@ skipping 136 matching lines @@
 }
 void CFX_MapPtrToPtr::FreeAssoc(CFX_MapPtrToPtr::CAssoc* pAssoc) {
   pAssoc->pNext = m_pFreeList;
   m_pFreeList = pAssoc;
   m_nCount--;
   ASSERT(m_nCount >= 0);
   if (m_nCount == 0) {
     RemoveAll();
   }
 }
-CFX_MapByteStringToPtr::CFX_MapByteStringToPtr(int nBlockSize)
-    : m_pHashTable(NULL),
-      m_nHashTableSize(17),
-      m_nCount(0),
-      m_pFreeList(NULL),
-      m_pBlocks(NULL),
-      m_nBlockSize(nBlockSize) {
-  ASSERT(m_nBlockSize > 0);
-}
-void CFX_MapByteStringToPtr::RemoveAll() {
-  if (m_pHashTable != NULL) {
-    for (FX_DWORD nHash = 0; nHash < m_nHashTableSize; nHash++) {
-      CAssoc* pAssoc;
-      for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL;
-           pAssoc = pAssoc->pNext) {
-        DestructElement(&pAssoc->key);
-      }
-    }
-    FX_Free(m_pHashTable);
-    m_pHashTable = NULL;
-  }
-  m_nCount = 0;
-  m_pFreeList = NULL;
-  m_pBlocks->FreeDataChain();
-  m_pBlocks = NULL;
-}
-CFX_MapByteStringToPtr::~CFX_MapByteStringToPtr() {
-  RemoveAll();
-  ASSERT(m_nCount == 0);
-}
-void CFX_MapByteStringToPtr::GetNextAssoc(FX_POSITION& rNextPosition,
-                                          CFX_ByteString& rKey,
-                                          void*& rValue) const {
-  ASSERT(m_pHashTable != NULL);
-  CAssoc* pAssocRet = (CAssoc*)rNextPosition;
-  ASSERT(pAssocRet != NULL);
-  if (pAssocRet == (CAssoc*)-1) {
-    for (FX_DWORD nBucket = 0; nBucket < m_nHashTableSize; nBucket++)
-      if ((pAssocRet = m_pHashTable[nBucket]) != NULL) {
-        break;
-      }
-    ASSERT(pAssocRet != NULL);
-  }
-  CAssoc* pAssocNext;
-  if ((pAssocNext = pAssocRet->pNext) == NULL) {
-    for (FX_DWORD nBucket = pAssocRet->nHashValue + 1;
-         nBucket < m_nHashTableSize; nBucket++)
-      if ((pAssocNext = m_pHashTable[nBucket]) != NULL) {
-        break;
-      }
-  }
-  rNextPosition = (FX_POSITION)pAssocNext;
-  rKey = pAssocRet->key;
-  rValue = pAssocRet->value;
-}
-void* CFX_MapByteStringToPtr::GetNextValue(FX_POSITION& rNextPosition) const {
-  ASSERT(m_pHashTable != NULL);
-  CAssoc* pAssocRet = (CAssoc*)rNextPosition;
-  ASSERT(pAssocRet != NULL);
-  if (pAssocRet == (CAssoc*)-1) {
-    for (FX_DWORD nBucket = 0; nBucket < m_nHashTableSize; nBucket++)
-      if ((pAssocRet = m_pHashTable[nBucket]) != NULL) {
-        break;
-      }
-    ASSERT(pAssocRet != NULL);
-  }
-  CAssoc* pAssocNext;
-  if ((pAssocNext = pAssocRet->pNext) == NULL) {
-    for (FX_DWORD nBucket = pAssocRet->nHashValue + 1;
-         nBucket < m_nHashTableSize; nBucket++)
-      if ((pAssocNext = m_pHashTable[nBucket]) != NULL) {
-        break;
-      }
-  }
-  rNextPosition = (FX_POSITION)pAssocNext;
-  return pAssocRet->value;
-}
-void*& CFX_MapByteStringToPtr::operator[](const CFX_ByteStringC& key) {
-  FX_DWORD nHash;
-  CAssoc* pAssoc;
-  if ((pAssoc = GetAssocAt(key, nHash)) == NULL) {
-    if (m_pHashTable == NULL) {
-      InitHashTable(m_nHashTableSize);
-    }
-    pAssoc = NewAssoc();
-    pAssoc->nHashValue = nHash;
-    pAssoc->key = key;
-    pAssoc->pNext = m_pHashTable[nHash];
-    m_pHashTable[nHash] = pAssoc;
-  }
-  return pAssoc->value;
-}
-CFX_MapByteStringToPtr::CAssoc* CFX_MapByteStringToPtr::NewAssoc() {
-  if (m_pFreeList == NULL) {
-    CFX_Plex* newBlock = CFX_Plex::Create(
-        m_pBlocks, m_nBlockSize, sizeof(CFX_MapByteStringToPtr::CAssoc));
-    CFX_MapByteStringToPtr::CAssoc* pAssoc =
-        (CFX_MapByteStringToPtr::CAssoc*)newBlock->data();
-    pAssoc += m_nBlockSize - 1;
-    for (int i = m_nBlockSize - 1; i >= 0; i--, pAssoc--) {
-      pAssoc->pNext = m_pFreeList;
-      m_pFreeList = pAssoc;
-    }
-  }
-  ASSERT(m_pFreeList != NULL);
-  CFX_MapByteStringToPtr::CAssoc* pAssoc = m_pFreeList;
-  m_pFreeList = m_pFreeList->pNext;
-  m_nCount++;
-  ASSERT(m_nCount > 0);
-  ConstructElement(&pAssoc->key);
-  pAssoc->value = 0;
-  return pAssoc;
-}
-void CFX_MapByteStringToPtr::FreeAssoc(CFX_MapByteStringToPtr::CAssoc* pAssoc) {
-  DestructElement(&pAssoc->key);
-  pAssoc->pNext = m_pFreeList;
-  m_pFreeList = pAssoc;
-  m_nCount--;
-  ASSERT(m_nCount >= 0);
-  if (m_nCount == 0) {
-    RemoveAll();
-  }
-}
-CFX_MapByteStringToPtr::CAssoc* CFX_MapByteStringToPtr::GetAssocAt(
-    const CFX_ByteStringC& key,
-    FX_DWORD& nHash) const {
-  nHash = HashKey(key) % m_nHashTableSize;
-  if (m_pHashTable == NULL) {
-    return NULL;
-  }
-  CAssoc* pAssoc;
-  for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL; pAssoc = pAssoc->pNext) {
-    if (pAssoc->key == key) {
-      return pAssoc;
-    }
-  }
-  return NULL;
-}
-FX_BOOL CFX_MapByteStringToPtr::Lookup(const CFX_ByteStringC& key,
-                                       void*& rValue) const {
-  FX_DWORD nHash;
-  CAssoc* pAssoc = GetAssocAt(key, nHash);
-  if (pAssoc == NULL) {
-    return FALSE;
-  }
-  rValue = pAssoc->value;
-  return TRUE;
-}
-void CFX_MapByteStringToPtr::InitHashTable(FX_DWORD nHashSize,
-                                           FX_BOOL bAllocNow) {
-  ASSERT(m_nCount == 0);
-  ASSERT(nHashSize > 0);
-  if (m_pHashTable != NULL) {
-    FX_Free(m_pHashTable);
-    m_pHashTable = NULL;
-  }
-  if (bAllocNow) {
-    m_pHashTable = FX_Alloc(CAssoc*, nHashSize);
-  }
-  m_nHashTableSize = nHashSize;
-}
-inline FX_DWORD CFX_MapByteStringToPtr::HashKey(
-    const CFX_ByteStringC& key) const {
-  FX_DWORD nHash = 0;
-  int len = key.GetLength();
-  const uint8_t* buf = key.GetPtr();
-  for (int i = 0; i < len; i++) {
-    nHash = (nHash << 5) + nHash + buf[i];
-  }
-  return nHash;
-}
-FX_BOOL CFX_MapByteStringToPtr::RemoveKey(const CFX_ByteStringC& key) {
-  if (m_pHashTable == NULL) {
-    return FALSE;
-  }
-  CAssoc** ppAssocPrev;
-  ppAssocPrev = &m_pHashTable[HashKey(key) % m_nHashTableSize];
-  CAssoc* pAssoc;
-  for (pAssoc = *ppAssocPrev; pAssoc != NULL; pAssoc = pAssoc->pNext) {
-    if (pAssoc->key == key) {
-      *ppAssocPrev = pAssoc->pNext;
-      FreeAssoc(pAssoc);
-      return TRUE;
-    }
-    ppAssocPrev = &pAssoc->pNext;
-  }
-  return FALSE;
-}
 struct _CompactString {
   uint8_t m_CompactLen;
   uint8_t m_LenHigh;
   uint8_t m_LenLow;
   uint8_t m_Unused;
   uint8_t* m_pBuffer;
 };
 static void _CompactStringRelease(_CompactString* pCompact) {
   if (pCompact->m_CompactLen == 0xff) {
     FX_Free(pCompact->m_pBuffer);
@@ skipping 237 matching lines @@
     } else {
       buf[mid].value = value;
       return;
     }
   }
   m_Buffer.InsertBlock(low * sizeof(_DWordPair), &pair, sizeof(_DWordPair));
 }
 void CFX_CMapDWordToDWord::EstimateSize(FX_DWORD size, FX_DWORD grow_by) {
   m_Buffer.EstimateSize(size, grow_by);
 }