pjs/xpcom/glue/nsVoidArray.cpp

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5.0 KiB
C++

/* -*- Mode: C++; tab-width: 2; 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 "nsVoidArray.h"
#include "nsCRT.h"
#include "nsISizeOfHandler.h"
static PRInt32 kGrowArrayBy = 8;
nsVoidArray::nsVoidArray()
{
mArray = nsnull;
mArraySize = 0;
mCount = 0;
}
nsVoidArray::nsVoidArray(PRInt32 aCount)
{
NS_PRECONDITION(aCount > 0, "bad count");
mCount = mArraySize = aCount;
mArray = new void*[mCount];
nsCRT::memset(mArray, 0, mCount * sizeof(void*));
}
nsVoidArray& nsVoidArray::operator=(const nsVoidArray& other)
{
if (nsnull != mArray) {
delete mArray;
}
PRInt32 otherCount = other.mCount;
mArraySize = otherCount;
mCount = otherCount;
if (otherCount != 0) {
mArray = new void*[otherCount];
nsCRT::memcpy(mArray, other.mArray, otherCount * sizeof(void*));
} else {
mArray = nsnull;
}
return *this;
}
nsVoidArray::~nsVoidArray()
{
if (nsnull != mArray) {
delete [] mArray;
}
}
void
nsVoidArray::SizeOf(nsISizeOfHandler* aHandler) const
{
aHandler->Add(sizeof(*this));
aHandler->Add(sizeof(void*) * mArraySize);
}
void* nsVoidArray::ElementAt(PRInt32 aIndex) const
{
if (PRUint32(aIndex) >= PRUint32(mCount)) {
return nsnull;
}
return mArray[aIndex];
}
PRInt32 nsVoidArray::IndexOf(void* aPossibleElement) const
{
void** ap = mArray;
void** end = ap + mCount;
while (ap < end) {
if (*ap == aPossibleElement) {
return ap - mArray;
}
ap++;
}
return -1;
}
PRBool nsVoidArray::InsertElementAt(void* aElement, PRInt32 aIndex)
{
PRInt32 oldCount = mCount;
if (PRUint32(aIndex) > PRUint32(oldCount)) {
// An invalid index causes the insertion to fail
return PR_FALSE;
}
if (oldCount + 1 > mArraySize) {
// We have to grow the array
PRInt32 newCount = oldCount + kGrowArrayBy;
void** newArray = new void*[newCount];
if (mArray != nsnull && aIndex != 0)
nsCRT::memcpy(newArray, mArray, aIndex * sizeof(void*));
PRInt32 slide = oldCount - aIndex;
if (0 != slide) {
// Slide data over to make room for the insertion
nsCRT::memcpy(newArray + aIndex + 1, mArray + aIndex,
slide * sizeof(void*));
}
if (mArray != nsnull)
delete [] mArray;
mArray = newArray;
mArraySize = newCount;
} else {
// The array is already large enough
PRInt32 slide = oldCount - aIndex;
if (0 != slide) {
// Slide data over to make room for the insertion
nsCRT::memmove(mArray + aIndex + 1, mArray + aIndex,
slide * sizeof(void*));
}
}
mArray[aIndex] = aElement;
mCount++;
return PR_TRUE;
}
PRBool nsVoidArray::ReplaceElementAt(void* aElement, PRInt32 aIndex)
{
if (PRUint32(aIndex) >= PRUint32(mCount)) {
// An invalid index causes the replace to fail
return PR_FALSE;
}
mArray[aIndex] = aElement;
return PR_TRUE;
}
PRBool nsVoidArray::RemoveElementAt(PRInt32 aIndex)
{
PRInt32 oldCount = mCount;
if (PRUint32(aIndex) >= PRUint32(oldCount)) {
// An invalid index causes the replace to fail
return PR_FALSE;
}
// We don't need to move any elements if we're removing the
// last element in the array
if (aIndex < (oldCount - 1)) {
nsCRT::memmove(mArray + aIndex, mArray + aIndex + 1,
(oldCount - 1 - aIndex) * sizeof(void*));
}
mCount--;
return PR_TRUE;
}
PRBool nsVoidArray::RemoveElement(void* aElement)
{
void** ep = mArray;
void** end = ep + mCount;
while (ep < end) {
void* e = *ep++;
if (e == aElement) {
ep--;
return RemoveElementAt(PRInt32(ep - mArray));
}
}
return PR_FALSE;
}
void nsVoidArray::Clear()
{
mCount = 0;
}
void nsVoidArray::Compact()
{
PRInt32 count = mCount;
if (mArraySize != count) {
void** newArray = new void*[count];
if (nsnull != newArray) {
nsCRT::memcpy(newArray, mArray, count * sizeof(void*));
delete [] mArray;
mArray = newArray;
mArraySize = count;
}
}
}
PRBool nsVoidArray::EnumerateForwards(nsVoidArrayEnumFunc aFunc, void* aData)
{
PRInt32 index = -1;
PRBool running = PR_TRUE;
while (running && (++index < mCount)) {
running = (*aFunc)(mArray[index], aData);
}
return running;
}
PRBool nsVoidArray::EnumerateBackwards(nsVoidArrayEnumFunc aFunc, void* aData)
{
PRInt32 index = mCount;
PRBool running = PR_TRUE;
while (running && (0 <= --index)) {
running = (*aFunc)(mArray[index], aData);
}
return running;
}