/*

* Copyright (c) 2003 - 2004 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description: 

*

*/

#include "cxml_internal.h"

/* ------------------------------------------------------------------------- */

/* ------------------------------------------------------------------------- */

static

CXML_Uint8*

CXML_Vector_AllocateSegment (CXML_Vector_t* thisObj, NW_TinyTree_TreeNode_t* sentinel)

{

  CXML_Uint8* buffer = NULL;

	if(sentinel)

	{

		buffer = (NW_Uint8*) NW_Mem_Malloc ((thisObj->segmentSize + 1) * thisObj->elementSize);

		if(buffer)

		{

		NW_Mem_memcpy(buffer, sentinel, sizeof(NW_TinyTree_TreeNode_t));

		buffer += thisObj->elementSize;

   	        }

	}

	else

	{

		buffer = (NW_Uint8*) NW_Mem_Malloc (thisObj->segmentSize * thisObj->elementSize);

	}

	return buffer;

}

/* ------------------------------------------------------------------------- */

static

NW_Status_t

CXML_Vector_ResizeCapacity (CXML_Vector_t* thisObj,

							CXML_Vector_Metric_t capacityNeeded,

							NW_TinyTree_TreeNode_t* sentinel)

{

  CXML_Vector_Metric_t newNumSegments;

  CXML_Vector_Metric_t newSegmentListSize;

  NW_Uint8** newSegmentList;

 // CXML_Vector_Metric_t index;

  /* calculate the new segmentList size */

  newNumSegments =

    (CXML_Vector_Metric_t) ((capacityNeeded - 1) / thisObj->segmentSize + 1);

  newSegmentListSize = (CXML_Vector_Metric_t)

    (((newNumSegments - 1) / CXML_SEGMENT_LIST_INCREMENT + 1) * CXML_SEGMENT_LIST_INCREMENT);

  /* if we are shrinking the array, we must first deallocate all the segments

     that will be obsolete */

  while (thisObj->numSegments > newNumSegments) {

    NW_Mem_Free (thisObj->segmentList[--thisObj->numSegments]);

  }

  thisObj->capacity =

    (CXML_Vector_Metric_t) (thisObj->numSegments * thisObj->segmentSize);

  /* allocate the new segmentList and copy the old segmentList entries into the

     new */

  newSegmentList =

    (NW_Uint8**) NW_Mem_Malloc (newSegmentListSize * sizeof (*newSegmentList));

  if (newSegmentList == NULL) {

    return NW_STAT_OUT_OF_MEMORY; 

  }

  (void) NW_Mem_memcpy (newSegmentList, thisObj->segmentList,

                        thisObj->numSegments * sizeof (*newSegmentList));

  /* free the old segmentList and install the new */

 NW_Mem_Free (thisObj->segmentList);

  thisObj->segmentList = newSegmentList;

  thisObj->segmentListSize = newSegmentListSize;

  /* if we are growing the array we need to allocate the new segments */

  while (thisObj->numSegments < newNumSegments) {

    thisObj->segmentList[thisObj->numSegments] =

      CXML_Vector_AllocateSegment(thisObj, sentinel);

    if (thisObj->segmentList[thisObj->numSegments++] == NULL) {

      thisObj->numSegments -= 1;

      return NW_STAT_OUT_OF_MEMORY; 

    }

  }

  thisObj->capacity =

    (CXML_Vector_Metric_t) (thisObj->numSegments * thisObj->segmentSize);

  /* successful completion */

  return NW_STAT_SUCCESS;

}

/* ------------------------------------------------------------------------- */

static

NW_Status_t

CXML_Vector_MoveElements (CXML_Vector_t* thisObj,

													CXML_Vector_Metric_t srcIndex,

													CXML_Vector_Metric_t dstIndex,

													NW_TinyTree_TreeNode_t* sentinel)

{

  NW_Int32 sizeDelta;

  CXML_Vector_Metric_t numElements;

  NW_Int32 index;

  /* */

  if (dstIndex > srcIndex) {

    sizeDelta = dstIndex - srcIndex;

  } else {

    sizeDelta = - (NW_Int32) (srcIndex - dstIndex);

  }

  if (thisObj->size + sizeDelta > thisObj->capacity) {

    NW_Status_t status;

    status = CXML_Vector_ResizeCapacity (thisObj,

			(CXML_Vector_Metric_t) (thisObj->size + sizeDelta), sentinel);

    if (status != NW_STAT_SUCCESS) {

      return status;

    }

  }

  /* now do the actual move */

  /* TODO: this is a very inefficient way of moving the data, we will probably

     need to implement a block move capability */

  numElements = (CXML_Vector_Metric_t) (thisObj->size - srcIndex);

  if (srcIndex > dstIndex) {

    for (index = 0; index < NW_INT32_CAST(numElements); index++) {

      (void) NW_Mem_memcpy (CXML_Vector_AddressAt (thisObj, 

				(CXML_Vector_Metric_t) (dstIndex + index)), CXML_Vector_AddressAt (thisObj,

				(CXML_Vector_Metric_t) (srcIndex + index)), thisObj->elementSize);

    }

  } else {

    for (index = numElements - 1; index >= 0; index--) {

      (void) NW_Mem_memcpy (CXML_Vector_AddressAt (thisObj, 

				(CXML_Vector_Metric_t) (dstIndex + index)), CXML_Vector_AddressAt (thisObj, 

				(CXML_Vector_Metric_t) (srcIndex + index)), thisObj->elementSize);

    }

  }

  /* successful completion */

  return NW_STAT_SUCCESS;

}

CXML_Vector_t*

CXML_Vector_Construct(CXML_Vector_Metric_t elementSize,

											CXML_Vector_Metric_t segmentSize)

{

	CXML_Vector_t* vector = (CXML_Vector_t*) NW_Mem_Malloc(sizeof(CXML_Vector_t));

if(vector)

 {

	vector->elementSize = elementSize;

	vector->capacity = 0;

	vector->size = 0;

	vector->segmentSize = segmentSize;

	vector->segmentListSize = CXML_SEGMENT_LIST_INCREMENT;

	//Allocate memory for one segment here. For more memory the

	//function CXML_Vector_ResizeCapacity() will do the job.

	vector->segmentList = (NW_Uint8**)

              NW_Mem_Malloc (vector->segmentListSize * sizeof (*vector->segmentList));

  if (vector->segmentList == NULL) {

		NW_Mem_Free(vector);

                return NULL;

  }

vector->numSegments = 0;

	}

	return vector;

}

void

CXML_Vector_Destruct(CXML_Vector_t* vector)

{

	CXML_Vector_Metric_t index;

	for (index = 0; index < vector->numSegments; index++) {

		NW_Mem_Free (vector->segmentList[index]);

	}

	NW_Mem_Free (vector->segmentList);

	NW_Mem_Free(vector);

}

void

CXML_Vector_AdjustSegment(CXML_Vector_t* vector)

{

	CXML_Vector_Metric_t index;

  /* 

   * Walk through segment list adjusting pointers to the 

   * sentinel element at the beginning of each segment

   */

  for (index = 0; index < vector->numSegments; index++) {

    vector->segmentList[index] -= vector->elementSize; 

  }

}

NW_Uint8*

CXML_Vector_AddressAt (const CXML_Vector_t* thisObj,

											 CXML_Vector_Metric_t index)

{

  CXML_Vector_Metric_t segmentIndex;

  /* determine the segment index and return the offset into that segment */

  segmentIndex =

    (CXML_Vector_Metric_t) (index / thisObj->segmentSize);

  return

    (NW_Uint8*) thisObj->segmentList[segmentIndex]

    + (index % thisObj->segmentSize) * thisObj->elementSize;

}

/* ------------------------------------------------------------------------- */

void**

CXML_Vector_InsertAt (CXML_Vector_t* thisObj,

											void* element,

											CXML_Vector_Metric_t where,

											void* sentinel)

{

  NW_Status_t status;

  /* convert the where if CXML_Vector_AtEnd is specified */

  if (where == CXML_Vector_AtEnd) {

    where = thisObj->size;

  }

  /* make sure that the where element is not out of bounds */

  NW_ASSERT (where <= thisObj->size);

  /* move all the elements up by one, if this fails we simply return

     the error code passed to us */

  status =

    CXML_Vector_MoveElements (thisObj, where,

                              (CXML_Vector_Metric_t) (where + 1),

                              (NW_TinyTree_TreeNode_t*) sentinel);

  if (status != NW_STAT_SUCCESS) {

    return NULL;

  }

  /* copy the element into vector */

  if (element != NULL) {

    (void) NW_Mem_memcpy (CXML_Vector_AddressAt (thisObj, where),

			element, thisObj->elementSize);

  } else {

    /*

     * if element is NULL, then we need to zero out the memory block.  This is necessary

	 * because later code which fills in the values for this newly allocated vector

	 * element may leave some bytes in the memory block un-assigned due to padding.

	 */

    NW_Mem_memset ( CXML_Vector_AddressAt (thisObj, where), 

			0, thisObj->elementSize);

  }

  /* increment the size count */

  thisObj->size += 1;

  /* successful completion */

  return (void**)

    CXML_Vector_AddressAt (thisObj, where);

}

/* ------------------------------------------------------------------------- */

NW_Status_t

CXML_Vector_RemoveAt (CXML_Vector_t* thisObj,

											CXML_Vector_Metric_t index)

{

  NW_Status_t status;

  /* convert the index if CXML_Vector_AtEnd is specified */

  if (index == CXML_Vector_AtEnd) {

    index = (CXML_Vector_Metric_t) (thisObj->size -  1);

  }

  /* make sure that the index element is not out of bounds */

  if (index >= thisObj->size) {

    return NW_STAT_FAILURE;

  }

  /* don't bother to move anything if the resultant size is zero */

  if (thisObj->size > 1) {

    /* move all the elements down by one, if this fails we simply return

       the error code passed to us */

    status =

      CXML_Vector_MoveElements (thisObj, (CXML_Vector_Metric_t) (index + 1),

																index, NULL);

    if (status != NW_STAT_SUCCESS) {

      return status;

    }

  }

  /* increment the size count */

  thisObj->size -= 1;

  /* successful completion */

  return NW_STAT_SUCCESS;

}

/* ------------------------------------------------------------------------- */

void**

CXML_Vector_ElementAt (const CXML_Vector_t* vector,

											 CXML_Vector_Metric_t index)

{

  if (index >= vector->size) {

    return NULL;

  }

  return (void**) CXML_Vector_AddressAt (vector, index);

}

/* ------------------------------------------------------------------------- */

CXML_Vector_Metric_t

CXML_Vector_GetElementIndex (const CXML_Vector_t* vector,

														 void* target)

{

  CXML_Vector_Metric_t index;

  for (index = 0; index < vector->size; index++) {

    void* element;

    /* get and compare the element */

    element = CXML_Vector_ElementAt (vector, index);

    if (NW_Mem_memcmp (target, element, vector->elementSize) == 0) {

      return index;

    }

  }

  /* no match found, return CXML_Vector_AtEnd */

  return CXML_Vector_AtEnd;

}