gecko-dev/lib/libmsg/dwordarr.cpp
1998-06-22 22:39:40 +00:00

282 lines
6.4 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#include "msg.h"
#include "xp.h"
#include "dwordarr.h"
#include "xp_qsort.h"
#ifdef XP_WIN16
#define SIZE_T_MAX 0xFF80 // Maximum allocation size
#define MAX_ARR_ELEMS SIZE_T_MAX/sizeof(uint32)
#endif
XPDWordArray::XPDWordArray()
{
m_nSize = 0;
m_nMaxSize = 0;
m_nGrowBy = 0;
m_pData = NULL;
}
XPDWordArray::~XPDWordArray()
{
SetSize(0);
}
/////////////////////////////////////////////////////////////////////////////
int XPDWordArray::GetSize() const
{
return m_nSize;
}
XP_Bool XPDWordArray::SetSize(int nSize, int nGrowBy)
{
XP_ASSERT(nSize >= 0);
if (nGrowBy >= 0)
m_nGrowBy = nGrowBy;
#ifdef MAX_ARR_ELEMS
if (nSize > MAX_ARR_ELEMS);
{
XP_ASSERT(nSize <= MAX_ARR_ELEMS); // Will fail
return FALSE;
}
#endif
if (nSize == 0)
{
// Remove all elements
XP_FREE(m_pData);
m_nSize = 0;
m_nMaxSize = 0;
m_pData = NULL;
}
else if (m_pData == NULL)
{
// Create a new array
m_nMaxSize = MAX(8, nSize);
m_pData = (uint32 *)XP_CALLOC(1, m_nMaxSize * sizeof(uint32));
if (m_pData)
m_nSize = nSize;
else
m_nSize = m_nMaxSize = 0;
}
else if (nSize <= m_nMaxSize)
{
// The new size is within the current maximum size, make sure new
// elements are to initialized to zero
if (nSize > m_nSize)
XP_MEMSET(&m_pData[m_nSize], 0, (nSize - m_nSize) * sizeof(uint32));
m_nSize = nSize;
}
else
{
// The array needs to grow, figure out how much
int nMaxSize;
nGrowBy = MAX(m_nGrowBy, MIN(1024, MAX(8, m_nSize / 8)));
nMaxSize = MAX(nSize, m_nMaxSize + nGrowBy);
#ifdef MAX_ARR_ELEMS
nMaxSize = MIN(MAX_ARR_ELEMS, nMaxSize);
#endif
uint32 *pNewData = (uint32 *)XP_ALLOC(nMaxSize * sizeof(uint32));
if (pNewData)
{
// Copy the data from the old array to the new one
XP_MEMCPY(pNewData, m_pData, m_nSize * sizeof(uint32));
// Zero out the remaining elements
XP_MEMSET(&pNewData[m_nSize], 0, (nSize - m_nSize) * sizeof(uint32));
m_nSize = nSize;
m_nMaxSize = nMaxSize;
// Free the old array
XP_FREE(m_pData);
m_pData = pNewData;
}
}
return nSize == m_nSize;
}
/////////////////////////////////////////////////////////////////////////////
uint32 &XPDWordArray::ElementAt(int nIndex)
{
XP_ASSERT(nIndex >= 0 && nIndex < m_nSize);
return m_pData[nIndex];
}
uint32 XPDWordArray::GetAt(int nIndex) const
{
XP_ASSERT(nIndex >= 0 && nIndex < m_nSize);
return m_pData[nIndex];
}
uint32 *XPDWordArray::GetData()
{
return m_pData;
}
void XPDWordArray::SetAt(int nIndex, uint32 newElement)
{
XP_ASSERT(nIndex >= 0 && nIndex < m_nSize);
m_pData[nIndex] = newElement;
}
/////////////////////////////////////////////////////////////////////////////
int XPDWordArray::Add(uint32 newElement)
{
int nIndex = m_nSize;
#ifdef MAX_ARR_ELEMS
if (nIndex >= MAX_ARR_ELEMS)
return -1;
#endif
SetAtGrow(nIndex, newElement);
return nIndex;
}
uint XPDWordArray::Add(uint32 *elementPtr, uint numElements)
{
if (SetSize(m_nSize + numElements))
XP_MEMCPY(m_pData + m_nSize, elementPtr, numElements * sizeof(uint32));
return m_nSize;
}
uint32 *XPDWordArray::CloneData()
{
uint32 *copyOfData = (uint32 *)XP_ALLOC(m_nSize * sizeof(uint32));
if (copyOfData)
XP_MEMCPY(copyOfData, m_pData, m_nSize * sizeof(uint32));
return copyOfData;
}
void XPDWordArray::InsertAt(int nIndex, uint32 newElement, int nCount)
{
XP_ASSERT(nIndex >= 0);
XP_ASSERT(nCount > 0);
if (nIndex >= m_nSize)
{
// If the new element is after the end of the array, grow the array
SetSize(nIndex + nCount);
}
else
{
// The element is being insert inside the array
int nOldSize = m_nSize;
SetSize(m_nSize + nCount);
// Move the data after the insertion point
XP_MEMMOVE(&m_pData[nIndex + nCount], &m_pData[nIndex],
(nOldSize - nIndex) * sizeof(uint32));
}
// Insert the new elements
XP_ASSERT(nIndex + nCount <= m_nSize);
while (nCount--)
m_pData[nIndex++] = newElement;
}
void XPDWordArray::InsertAt(int nStartIndex, const XPDWordArray *pNewArray)
{
XP_ASSERT(nStartIndex >= 0);
XP_ASSERT(pNewArray != NULL);
if (pNewArray->GetSize() > 0)
{
InsertAt(nStartIndex, pNewArray->GetAt(0), pNewArray->GetSize());
for (int i = 1; i < pNewArray->GetSize(); i++)
m_pData[nStartIndex + i] = pNewArray->GetAt(i);
}
}
void XPDWordArray::RemoveAll()
{
SetSize(0);
}
void XPDWordArray::RemoveAt(int nIndex, int nCount)
{
XP_ASSERT(nIndex >= 0);
XP_ASSERT(nIndex + nCount <= m_nSize);
if (nCount > 0)
{
// Make sure not to overstep the end of the array
int nMoveCount = m_nSize - (nIndex + nCount);
if (nCount && nMoveCount)
XP_MEMMOVE(&m_pData[nIndex], &m_pData[nIndex + nCount],
nMoveCount * sizeof(uint32));
m_nSize -= nCount;
}
}
void XPDWordArray::SetAtGrow(int nIndex, uint32 newElement)
{
XP_ASSERT(nIndex >= 0);
if (nIndex >= m_nSize)
SetSize(nIndex+1);
m_pData[nIndex] = newElement;
}
/////////////////////////////////////////////////////////////////////////////
void XPDWordArray::CopyArray(XPDWordArray *oldA)
{
CopyArray(*oldA);
}
void XPDWordArray::CopyArray(XPDWordArray &oldA)
{
if (m_pData)
XP_FREE(m_pData);
m_nSize = oldA.m_nSize;
m_nMaxSize = oldA.m_nMaxSize;
m_pData = (uint32 *)XP_ALLOC(m_nSize * sizeof(uint32));
if (m_pData)
XP_MEMCPY(m_pData, oldA.m_pData, m_nSize * sizeof(uint32));
}
/////////////////////////////////////////////////////////////////////////////
static int CompareDWord (const void *v1, const void *v2)
{
// QuickSort callback to compare array values
uint32 i1 = *(uint32 *)v1;
uint32 i2 = *(uint32 *)v2;
return i1 - i2;
}
void XPDWordArray::QuickSort (int (*compare) (const void *elem1, const void *elem2))
{
if (m_nSize > 1)
XP_QSORT (m_pData, m_nSize, sizeof(void*), compare ? compare : CompareDWord);
}