axmol/cocos2dx/support/data_support/ccCArray.h

/****************************************************************************
Copyright (c) 2010-2011 cocos2d-x.org
Copyright (c) 2007      Scott Lembcke

http://www.cocos2d-x.org

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/** 
 @file
 Based on Chipmunk cpArray.
 ccArray is a faster alternative to CCMutableArray, it does pretty much the
 same thing (stores CCObjects and retains/releases them appropriately). It's
 faster because:
 - it uses a plain C interface so it doesn't incur Objective-c messaging overhead 
 - it assumes you know what you're doing, so it doesn't spend time on safety checks
   (index out of bounds, required capacity etc.)
 - comparisons are done using pointer equality instead of isEqual
 */

#ifndef CC_ARRAY_H
#define CC_ARRAY_H

#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include "ccMacros.h"
#include "CCObject.h"
#include "ccMacros.h"

NS_CC_BEGIN

	// Easy integration	
#define CCARRAYDATA_FOREACH(__array__, __object__)															\
	__object__=__array__->arr[0]; for(unsigned int i=0, num=__array__->num; i<num; i++, __object__=__array__->arr[i])	\

typedef struct _ccArray 
{
	unsigned int num, max;
	CCObject**    arr; //equals CCObject** arr;
} ccArray;

/** Allocates and initializes a new array with specified capacity */
static inline ccArray* ccArrayNew(unsigned int capacity) 
{
	if (capacity == 0)
	{
		capacity = 1; 
	}
	
	ccArray *arr = (ccArray*)malloc( sizeof(ccArray) );
	arr->num = 0;
	
	arr->arr =  (CCObject**)malloc( capacity * sizeof(CCObject*) );
	arr->max = capacity;
	
	return arr;
}

static inline void ccArrayRemoveAllObjects(ccArray *arr);

/** Frees array after removing all remaining objects. Silently ignores nil arr. */
static inline void ccArrayFree(ccArray*& arr)
{
	if( arr == NULL ) 
	{
		return;
	}
	
	ccArrayRemoveAllObjects(arr);
	
	free(arr->arr);
	free(arr);
    arr = NULL;
}

/** Doubles array capacity */
static inline void ccArrayDoubleCapacity(ccArray *arr)
{
	arr->max *= 2;
    CCObject** newArr = (CCObject**)realloc( arr->arr, arr->max * sizeof(CCObject*) );
    // will fail when there's not enough memory
    CCAssert(newArr != NULL, "ccArrayDoubleCapacity failed. Not enough memory");
    arr->arr = newArr;
}

/** Increases array capacity such that max >= num + extra. */
static inline void ccArrayEnsureExtraCapacity(ccArray *arr, unsigned int extra)
{
	while (arr->max < arr->num + extra)
	{
		ccArrayDoubleCapacity(arr); 
	}
}

/** shrinks the array so the memory footprint corresponds with the number of items */
static inline void ccArrayShrink(ccArray *arr)
{
    unsigned int newSize;

    //only resize when necessary
    if (arr->max > arr->num && !(arr->num==0 && arr->max==1))
    {
        if (arr->num!=0) 
        {
            newSize=arr->num;
            arr->max=arr->num; 
        }
        else 
        {//minimum capacity of 1, with 0 elements the array would be free'd by realloc
            newSize=1;
            arr->max=1;
        }

        arr->arr = (CCObject**) realloc(arr->arr,newSize * sizeof(CCObject*) );
        CCAssert(arr->arr != NULL, "could not reallocate the memory");
    }
} 

/** Returns index of first occurence of object, UXNotFound if object not found. */
static inline unsigned int ccArrayGetIndexOfObject(ccArray *arr, CCObject* object)
{
	for ( unsigned int i = 0; i < arr->num; i++)
	{
		if (arr->arr[i] == object) 
		{
			return i;
		}
	}

	return UINT_MAX; 
}

/** Returns a Boolean value that indicates whether object is present in array. */
static inline bool ccArrayContainsObject(ccArray *arr, CCObject* object)
{
	return ccArrayGetIndexOfObject(arr, object) != UINT_MAX;
}

/** Appends an object. Bahaviour undefined if array doesn't have enough capacity. */
static inline void ccArrayAppendObject(ccArray *arr, CCObject* object)
{
	arr->arr[arr->num] = object; object->retain();
	arr->num++;
}

/** Appends an object. Capacity of arr is increased if needed. */
static inline void ccArrayAppendObjectWithResize(ccArray *arr, CCObject* object)
{
	ccArrayEnsureExtraCapacity(arr, 1);
	ccArrayAppendObject(arr, object);
}

/** Appends objects from plusArr to arr. Behaviour undefined if arr doesn't have
 enough capacity. */
static inline void ccArrayAppendArray(ccArray *arr, ccArray *plusArr)
{
	for( unsigned int i = 0; i < plusArr->num; i++)
	{
		ccArrayAppendObject(arr, plusArr->arr[i]); 
	}
}

/** Appends objects from plusArr to arr. Capacity of arr is increased if needed. */
static inline void ccArrayAppendArrayWithResize(ccArray *arr, ccArray *plusArr)
{
	ccArrayEnsureExtraCapacity(arr, plusArr->num); 
	ccArrayAppendArray(arr, plusArr);
}

/** Inserts an object at index */
static inline void ccArrayInsertObjectAtIndex(ccArray *arr, CCObject* object, unsigned int index)
{
    CCAssert(index<=arr->num, "Invalid index. Out of bounds");

    ccArrayEnsureExtraCapacity(arr, 1);

    unsigned int remaining = arr->num - index;
    if( remaining > 0)
        memmove(&arr->arr[index+1], &arr->arr[index], sizeof(CCObject*) * remaining );

    object->retain();
    arr->arr[index] = object;
    arr->num++;
}

/** Swaps two objects */
static inline void ccArraySwapObjectsAtIndexes(ccArray *arr, unsigned int index1, unsigned int index2)
{
    CCAssert(index1 < arr->num, "(1) Invalid index. Out of bounds");
    CCAssert(index2 < arr->num, "(2) Invalid index. Out of bounds");

    CCObject* object1 = arr->arr[index1];

    arr->arr[index1] = arr->arr[index2];
    arr->arr[index2] = object1;
}

/** Removes all objects from arr */
static inline void ccArrayRemoveAllObjects(ccArray *arr)
{
	while(arr->num > 0)
	{
		arr->arr[--arr->num]->release();
	}
}

/** Removes object at specified index and pushes back all subsequent objects.
 Behaviour undefined if index outside [0, num-1]. */
static inline void ccArrayRemoveObjectAtIndex(ccArray *arr, unsigned int index, bool bReleaseObj)
{
    CCAssert(arr && arr->num > 0 && index < arr->num, "Invalid index. Out of bounds");
    if (bReleaseObj)
    {
        arr->arr[index]->release(); 
    }

    arr->num--;

    unsigned int remaining = arr->num - index;
    if (remaining > 0)
    {
	    memmove(&arr->arr[index], &arr->arr[index+1], remaining * sizeof(void*));
    }
}

/** Removes object at specified index and fills the gap with the last object,
 thereby avoiding the need to push back subsequent objects.
 Behaviour undefined if index outside [0, num-1]. */
static inline void ccArrayFastRemoveObjectAtIndex(ccArray *arr, unsigned int index)
{
	arr->arr[index]->release();

	unsigned int last = --arr->num;
	arr->arr[index] = arr->arr[last];
}

static inline void ccArrayFastRemoveObject(ccArray *arr, CCObject* object)
{
    unsigned int index = ccArrayGetIndexOfObject(arr, object);
    if (index != UINT_MAX)
	{
        ccArrayFastRemoveObjectAtIndex(arr, index);
	}
}

/** Searches for the first occurance of object and removes it. If object is not
 found the function has no effect. */
static inline void ccArrayRemoveObject(ccArray *arr, CCObject* object, bool bReleaseObj)
{
	unsigned int index = ccArrayGetIndexOfObject(arr, object);

	if (index != UINT_MAX)
	{
		ccArrayRemoveObjectAtIndex(arr, index, bReleaseObj);
	}
}

/** Removes from arr all objects in minusArr. For each object in minusArr, the
 first matching instance in arr will be removed. */
static inline void ccArrayRemoveArray(ccArray *arr, ccArray *minusArr)
{
	for( unsigned int i = 0; i < minusArr->num; i++)
	{
		ccArrayRemoveObject(arr, minusArr->arr[i], true);
	}
}

/** Removes from arr all objects in minusArr. For each object in minusArr, all
 matching instances in arr will be removed. */
static inline void ccArrayFullRemoveArray(ccArray *arr, ccArray *minusArr)
{
	unsigned int back = 0;
	
	for( unsigned int i = 0; i < arr->num; i++) 
	{
		if( ccArrayContainsObject(minusArr, arr->arr[i]) ) 
		{
			arr->arr[i]->release(); 
			back++;
		}
		else
		{
			arr->arr[i - back] = arr->arr[i];
		}
	}
	
	arr->num -= back;
}

typedef struct _ccCArray 
{
	unsigned int num, max;
	void**    arr; //equals CCObject** arr;
} ccCArray;

static inline void ccCArrayRemoveAllValues(ccCArray *arr);

/** Allocates and initializes a new C array with specified capacity */
static inline ccCArray* ccCArrayNew(unsigned int capacity) 
{
	if (capacity == 0)
	{
		capacity = 1; 
	}
	
	ccCArray *arr = (ccCArray*)malloc( sizeof(ccCArray) );
	arr->num = 0;
	arr->arr =  (void**) malloc( capacity * sizeof(void*) );
	arr->max = capacity;
	
	return arr;
}

/** Frees C array after removing all remaining values. Silently ignores nil arr. */
static inline void ccCArrayFree(ccCArray *arr)
{
	if( arr == NULL ) 
	{
		return;
	}
	
	ccCArrayRemoveAllValues(arr);
	
	free(arr->arr);
	free(arr);
}

/** Doubles C array capacity */
static inline void ccCArrayDoubleCapacity(ccCArray *arr)
{
	ccArrayDoubleCapacity((ccArray*)arr);
}

/** Increases array capacity such that max >= num + extra. */
static inline void ccCArrayEnsureExtraCapacity(ccCArray *arr, unsigned int extra)
{
	ccArrayEnsureExtraCapacity((ccArray*)arr,extra);
}

/** Returns index of first occurence of value, NSNotFound if value not found. */
static inline int ccCArrayGetIndexOfValue(ccCArray *arr, void* value)
{
	for (unsigned int i = 0; i < arr->num; i++)
	{
		if (arr->arr[i] == value) 
		{
			return i;
		}
	}

	return -1;
}

/** Returns a Boolean value that indicates whether value is present in the C array. */
static inline bool ccCArrayContainsValue(ccCArray *arr, void* value)
{
	return ccCArrayGetIndexOfValue(arr, value) != -1;
}

/** Inserts a value at a certain position. The valid index is [0, num] */
static inline void ccCArrayInsertValueAtIndex( ccCArray *arr, void* value, unsigned int index)
{
    CCAssert( index < arr->max, "ccCArrayInsertValueAtIndex: invalid index");
	unsigned int remaining = arr->num - index;

	// make sure it has enough capacity
	if (arr->num + 1 == arr->max)
	{
        ccCArrayDoubleCapacity(arr);
	}
	
	// last Value doesn't need to be moved
	if( remaining > 0) 
	{
		// tex coordinates
		memmove( &arr->arr[index+1],&arr->arr[index], sizeof(void*) * remaining );
	}
	
	arr->num++;	
	arr->arr[index] = value;
}

/** Appends an value */
static inline void ccCArrayAppendValue(ccCArray *arr, void* value)
{
	arr->arr[arr->num] =  value;
	arr->num++;

	// double the capacity for the next append action
	// if the num >= max
	if (arr->num >= arr->max)
	{
		ccCArrayDoubleCapacity(arr);
	}
}

/** Appends an value. Capacity of arr is increased if needed. */
static inline void ccCArrayAppendValueWithResize(ccCArray *arr, void* value)
{
	ccCArrayEnsureExtraCapacity(arr, 1);
	ccCArrayAppendValue(arr, value);
}

/** Appends values from plusArr to arr. Behaviour undefined if arr doesn't have
 enough capacity. */
static inline void ccCArrayAppendArray(ccCArray *arr, ccCArray *plusArr)
{
	for (unsigned int i = 0; i < plusArr->num; i++)
	{
		ccCArrayAppendValue(arr, plusArr->arr[i]);
	}
}

/** Appends values from plusArr to arr. Capacity of arr is increased if needed. */
static inline void ccCArrayAppendArrayWithResize(ccCArray *arr, ccCArray *plusArr)
{
	ccCArrayEnsureExtraCapacity(arr, plusArr->num);
	ccCArrayAppendArray(arr, plusArr);
}

/** Removes all values from arr */
static inline void ccCArrayRemoveAllValues(ccCArray *arr)
{
	arr->num = 0;
}

/** Removes value at specified index and pushes back all subsequent values.
 Behaviour undefined if index outside [0, num-1]. */
static inline void ccCArrayRemoveValueAtIndex(ccCArray *arr, unsigned int index)
{	
	for (unsigned int last = --arr->num; index < last; index++)
	{
		arr->arr[index] = arr->arr[index + 1];
	}
}

/** Removes value at specified index and fills the gap with the last value,
 thereby avoiding the need to push back subsequent values.
 Behaviour undefined if index outside [0, num-1]. */
static inline void ccCArrayFastRemoveValueAtIndex(ccCArray *arr, unsigned int index)
{
	unsigned int last = --arr->num;
	arr->arr[index] = arr->arr[last];
}

/** Searches for the first occurance of value and removes it. If value is not
 found the function has no effect. */
static inline void ccCArrayRemoveValue(ccCArray *arr, void* value)
{
	unsigned int index = ccCArrayGetIndexOfValue(arr, value);
	if (index != UINT_MAX)
	{
		ccCArrayRemoveValueAtIndex(arr, index);
	}
}

/** Removes from arr all values in minusArr. For each Value in minusArr, the
 first matching instance in arr will be removed. */
static inline void ccCArrayRemoveArray(ccCArray *arr, ccCArray *minusArr)
{
	for( unsigned int i = 0; i < minusArr->num; i++)
	{
		ccCArrayRemoveValue(arr, minusArr->arr[i]);
	}
}

/** Removes from arr all values in minusArr. For each value in minusArr, all
 matching instances in arr will be removed. */
static inline void ccCArrayFullRemoveArray(ccCArray *arr, ccCArray *minusArr)
{
	unsigned int back = 0;
	
	for (unsigned int i = 0; i < arr->num; i++) 
	{
		if( ccCArrayContainsValue(minusArr, arr->arr[i]) ) 
		{
			back++;
		} else
		{
			arr->arr[i - back] = arr->arr[i];
		}
	}
	
	arr->num -= back;
} 

NS_CC_END

#endif // CC_ARRAY_H