/*
 ** Copyright 2003-2010, VisualOn, Inc.
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 **
 **     http://www.apache.org/licenses/LICENSE-2.0
 **
 ** Unless required by applicable law or agreed to in writing, software
 ** distributed under the License is distributed on an "AS IS" BASIS,
 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 ** See the License for the specific language governing permissions and
 ** limitations under the License.
 */

/*******************************************************************************
    File:       mem_align.c

    Content:    Memory alloc alignments functions

*******************************************************************************/


#include    "mem_align.h"
#ifdef _MSC_VER
#include    <stddef.h>
#else
#include    <stdint.h>
#endif

/*****************************************************************************
*
* function name: mem_malloc
* description:  malloc the alignments memory
* returns:      the point of the memory
*
**********************************************************************************/
void *
mem_malloc(VO_MEM_OPERATOR *pMemop, unsigned int size, unsigned char alignment, unsigned int CodecID)
{
    int ret;
    unsigned char *mem_ptr;
    VO_MEM_INFO MemInfo;

    if (!alignment) {

        MemInfo.Flag = 0;
        MemInfo.Size = size + 1;
        ret = pMemop->Alloc(CodecID, &MemInfo);
        if(ret != 0)
            return 0;
        mem_ptr = (unsigned char *)MemInfo.VBuffer;

        pMemop->Set(CodecID, mem_ptr, 0, size + 1);

        *mem_ptr = (unsigned char)1;

        return ((void *)(mem_ptr+1));
    } else {
        unsigned char *tmp;

        MemInfo.Flag = 0;
        MemInfo.Size = size + alignment;
        ret = pMemop->Alloc(CodecID, &MemInfo);
        if(ret != 0)
            return 0;

        tmp = (unsigned char *)MemInfo.VBuffer;

        pMemop->Set(CodecID, tmp, 0, size + alignment);

        mem_ptr =
            (unsigned char *) ((intptr_t) (tmp + alignment - 1) &
                    (~((intptr_t) (alignment - 1))));

        if (mem_ptr == tmp)
            mem_ptr += alignment;

        *(mem_ptr - 1) = (unsigned char) (mem_ptr - tmp);

        return ((void *)mem_ptr);
    }

    return(0);
}


/*****************************************************************************
*
* function name: mem_free
* description:  free the memory
*
*******************************************************************************/
void
mem_free(VO_MEM_OPERATOR *pMemop, void *mem_ptr, unsigned int CodecID)
{

    unsigned char *ptr;

    if (mem_ptr == 0)
        return;

    ptr = mem_ptr;

    ptr -= *(ptr - 1);

    pMemop->Free(CodecID, ptr);
}