gecko-dev/lib/libmsg/bytearr.cpp

222 строки
4.9 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 "bytearr.h"
#ifdef XP_WIN16
#define SIZE_T_MAX 0xFF80 // Maximum allocation size
#define MAX_ARR_ELEMS SIZE_T_MAX/sizeof(BYTE)
#endif
XPByteArray::XPByteArray()
{
m_nSize = 0;
m_nMaxSize = 0;
m_pData = NULL;
}
XPByteArray::~XPByteArray()
{
SetSize(0);
}
/////////////////////////////////////////////////////////////////////////////
int XPByteArray::GetSize() const
{
return m_nSize;
}
XP_Bool XPByteArray::SetSize(int nSize)
{
XP_ASSERT(nSize >= 0);
#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 = (BYTE *)XP_CALLOC(1, m_nMaxSize * sizeof(BYTE));
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(BYTE));
m_nSize = nSize;
}
else
{
// The array needs to grow, figure out how much
int nGrowBy, nMaxSize;
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
BYTE *pNewData = (BYTE *)XP_ALLOC(nMaxSize * sizeof(BYTE));
if (pNewData)
{
// Copy the data from the old array to the new one
XP_MEMCPY(pNewData, m_pData, m_nSize * sizeof(BYTE));
// Zero out the remaining elements
XP_MEMSET(&pNewData[m_nSize], 0, (nSize - m_nSize) * sizeof(BYTE));
m_nSize = nSize;
m_nMaxSize = nMaxSize;
// Free the old array
XP_FREE(m_pData);
m_pData = pNewData;
}
}
return nSize == m_nSize;
}
/////////////////////////////////////////////////////////////////////////////
BYTE &XPByteArray::ElementAt(int nIndex)
{
XP_ASSERT(nIndex >= 0 && nIndex < m_nSize);
return m_pData[nIndex];
}
BYTE XPByteArray::GetAt(int nIndex) const
{
XP_ASSERT(nIndex >= 0 && nIndex < m_nSize);
return m_pData[nIndex];
}
void XPByteArray::SetAt(int nIndex, BYTE newElement)
{
XP_ASSERT(nIndex >= 0 && nIndex < m_nSize);
m_pData[nIndex] = newElement;
}
/////////////////////////////////////////////////////////////////////////////
int XPByteArray::Add(BYTE newElement)
{
int nIndex = m_nSize;
#ifdef MAX_ARR_ELEMS
if (nIndex >= MAX_ARR_ELEMS)
return -1;
#endif
SetAtGrow(nIndex, newElement);
return nIndex;
}
void XPByteArray::InsertAt(int nIndex, BYTE 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(BYTE));
}
// Insert the new elements
XP_ASSERT(nIndex + nCount <= m_nSize);
while (nCount--)
m_pData[nIndex++] = newElement;
}
void XPByteArray::InsertAt(int nStartIndex, const XPByteArray *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 XPByteArray::RemoveAll()
{
SetSize(0);
}
void XPByteArray::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 >= 0)
XP_MEMMOVE(&m_pData[nIndex], &m_pData[nIndex + nCount],
nMoveCount * sizeof(BYTE));
m_nSize -= nCount;
}
}
void XPByteArray::SetAtGrow(int nIndex, BYTE newElement)
{
XP_ASSERT(nIndex >= 0);
if (nIndex >= m_nSize)
SetSize(nIndex+1);
m_pData[nIndex] = newElement;
}