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300 lines
9.4 KiB
C++
300 lines
9.4 KiB
C++
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is nsValueArray.h/nsValueArray.cpp code, released
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* Dec 28, 2001.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 2001 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* Garrett Arch Blythe, 20-December-2001
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*
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* Alternatively, the contents of this file may be used under the
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* terms of the GNU Public License (the "GPL"), in which case the
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* provisions of the GPL are applicable instead of those above.
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* If you wish to allow use of your version of this file only
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* under the terms of the GPL and not to allow others to use your
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* version of this file under the MPL, indicate your decision by
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* deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL. If you do not delete
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* the provisions above, a recipient may use your version of this
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* file under either the MPL or the GPL.
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*/
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//
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// nsValueArray.cpp
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//
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// Implement an array class to store unsigned integer values.
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// The maximum value must be known up front. Once known, the
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// smallest memory representation will be attempted; i.e. if the
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// maximum value was 1275, then 2 bytes (uint16) would represent each value
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// in the array instead of 4 bytes (uint32).
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//
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#include "nsValueArray.h"
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#include "nsCRT.h"
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#include "prmem.h"
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#include "prbit.h"
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#define NSVALUEARRAY_LINEAR_GROWBY 8
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#define NSVALUEARRAY_LINEAR_THRESHOLD 128
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nsValueArray::nsValueArray(nsValueArrayValue aMaxValue, nsValueArrayCount aInitialCapacity) {
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mCount = 0;
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mCapacity = 0;
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mValueArray = nsnull;
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PRUint8 test8 = (PRUint8)aMaxValue;
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PRUint16 test16 = (PRUint16)aMaxValue;
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PRUint32 test32 = (PRUint32)aMaxValue;
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if ((nsValueArrayValue)test8 == aMaxValue) {
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mBytesPerValue = sizeof(test8);
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}
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else if ((nsValueArrayValue)test16 == aMaxValue) {
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mBytesPerValue = sizeof(test16);
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}
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else if ((nsValueArrayValue)test32 == aMaxValue) {
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mBytesPerValue = sizeof(test32);
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}
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else {
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NS_ASSERTION(0, "not supported yet, add it yourself...");
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mBytesPerValue = 0;
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}
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if (aInitialCapacity) {
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mValueArray = (PRUint8*)PR_Malloc(aInitialCapacity * mBytesPerValue);
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if (nsnull != mValueArray) {
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mCapacity = aInitialCapacity;
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}
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}
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}
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nsValueArray::~nsValueArray() {
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if (nsnull != mValueArray) {
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PR_Free(mValueArray);
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mValueArray = nsnull;
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}
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}
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//
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// Copy it.
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//
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nsValueArray& nsValueArray::operator=(const nsValueArray& aOther) {
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//
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// Free off what you know if not enough space, or units differ.
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//
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if ((mBytesPerValue != aOther.mBytesPerValue || mCapacity < aOther.mCount) && nsnull != mValueArray) {
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PR_Free(mValueArray);
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mValueArray = nsnull;
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mCount = mCapacity = 0;
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}
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//
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// Copy some attribs.
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//
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mBytesPerValue = aOther.mBytesPerValue;
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mCount = aOther.mCount;
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//
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// Anything to do?
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//
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if (0 != mCount) {
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//
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// May need to allocate our buffer.
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//
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if (0 == mCapacity) {
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mValueArray = (PRUint8*)PR_Malloc(mCount * mBytesPerValue);
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mCapacity = mCount;
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}
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NS_ASSERTION(nsnull != mValueArray, "loss of value array assignment and original data.");
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if (nsnull != mValueArray) {
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memcpy(mValueArray, aOther.mValueArray, mCount * mBytesPerValue);
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}
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else {
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mCount = mCapacity = 0;
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}
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}
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return *this;
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}
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//
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// Insert a value into the array.
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// No validity checking other than index is done.
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//
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PRBool nsValueArray::InsertValueAt(nsValueArrayValue aValue, nsValueArrayIndex aIndex) {
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PRBool retval = PR_FALSE;
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nsValueArrayCount count = Count();
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if (aIndex <= count) {
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//
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// If we're at capacity, then we'll need to grow a little.
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//
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if (Capacity() == count) {
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PRUint8* reallocRes = nsnull;
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nsValueArrayCount growBy = NSVALUEARRAY_LINEAR_GROWBY;
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//
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// Up to a particular limit we grow in small increments.
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// Otherwise, grow exponentially.
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//
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if (count >= NSVALUEARRAY_LINEAR_THRESHOLD) {
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growBy = PR_BIT(PR_CeilingLog2(count + 1)) - count;
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}
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if (nsnull == mValueArray) {
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reallocRes = (PRUint8*)PR_Malloc((count + growBy) * mBytesPerValue);
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}
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else {
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reallocRes = (PRUint8*)PR_Realloc(mValueArray, (count + growBy) * mBytesPerValue);
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}
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if (nsnull != reallocRes) {
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mValueArray = reallocRes;
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mCapacity += growBy;
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}
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}
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//
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// Only if we are below capacity do we continue.
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//
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if (Capacity() > count) {
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//
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// All those at and beyond the insertion point need to move.
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//
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if (aIndex < count) {
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memmove(&mValueArray[(aIndex + 1) * mBytesPerValue], &mValueArray[aIndex * mBytesPerValue], (count - aIndex) * mBytesPerValue);
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}
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//
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// Do the assignment.
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//
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switch (mBytesPerValue) {
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case sizeof(PRUint8):
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*((PRUint8*)&mValueArray[aIndex * mBytesPerValue]) = (PRUint8)aValue;
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NS_ASSERTION(*((PRUint8*)&mValueArray[aIndex * mBytesPerValue]) == aValue, "Lossy value array detected. Report a higher maximum upon construction!");
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break;
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case sizeof(PRUint16):
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*((PRUint16*)&mValueArray[aIndex * mBytesPerValue]) = (PRUint16)aValue;
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NS_ASSERTION(*((PRUint16*)&mValueArray[aIndex * mBytesPerValue]) == aValue, "Lossy value array detected. Report a higher maximum upon construction!");
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break;
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case sizeof(PRUint32):
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*((PRUint32*)&mValueArray[aIndex * mBytesPerValue]) = (PRUint32)aValue;
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NS_ASSERTION(*((PRUint32*)&mValueArray[aIndex * mBytesPerValue]) == aValue, "Lossy value array detected. Report a higher maximum upon construction!");
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break;
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default:
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NS_ASSERTION(0, "surely you've been warned prior to this!");
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break;
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}
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//
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// Up the count by 1.
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//
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mCount++;
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}
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}
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return retval;
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}
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//
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// Remove the index from the value array.
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// The array does not shrink until Compact() is invoked.
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//
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PRBool nsValueArray::RemoveValueAt(nsValueArrayIndex aIndex) {
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PRBool retval = PR_FALSE;
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nsValueArrayCount count = Count();
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if (aIndex < count) {
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//
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// Move memory around if appropriate.
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//
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if (aIndex != (count - 1)) {
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memmove(&mValueArray[aIndex * mBytesPerValue], &mValueArray[(aIndex + 1) * mBytesPerValue], (count - aIndex - 1) * mBytesPerValue);
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}
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//
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// Update our count.
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//
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mCount--;
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}
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return retval;
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}
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//
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// Shrink as much as possible.
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//
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void nsValueArray::Compact() {
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nsValueArrayCount count = Count();
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if (Capacity() != count)
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{
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if (0 == count) {
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PR_Free(mValueArray);
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mValueArray = nsnull;
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mCapacity = 0;
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}
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else {
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PRUint8* reallocRes = (PRUint8*)PR_Realloc(mValueArray, count * mBytesPerValue);
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if (nsnull != reallocRes) {
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mValueArray = reallocRes;
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mCapacity = count;
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}
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}
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}
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}
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//
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// Return the value at the index.
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//
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nsValueArrayValue nsValueArray::ValueAt(nsValueArrayIndex aIndex) const {
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nsValueArrayValue retval = NSVALUEARRAY_INVALID;
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if (aIndex < Count()) {
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switch (mBytesPerValue) {
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case sizeof(PRUint8):
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retval = (nsValueArrayIndex)*((PRUint8*)&mValueArray[aIndex * mBytesPerValue]);
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break;
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case sizeof(PRUint16):
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retval = (nsValueArrayIndex)*((PRUint16*)&mValueArray[aIndex * mBytesPerValue]);
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break;
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case sizeof(PRUint32):
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retval = (nsValueArrayIndex)*((PRUint32*)&mValueArray[aIndex * mBytesPerValue]);
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break;
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default:
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NS_ASSERTION(0, "unexpected for sure.");
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break;
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}
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}
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return retval;
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}
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//
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// Return the first encountered index of the value.
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//
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nsValueArrayIndex nsValueArray::IndexOf(nsValueArrayValue aPossibleValue) const {
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nsValueArrayIndex retval = NSVALUEARRAY_INVALID;
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nsValueArrayIndex traverse;
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for (traverse = 0; traverse < Count(); traverse++) {
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if (aPossibleValue == ValueAt(traverse)) {
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retval = traverse;
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break;
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}
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}
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return retval;
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}
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