/* ***** BEGIN LICENSE BLOCK *****
    Source last modified: $Id: buffers.c,v 1.1 2005/02/26 01:47:34 jrecker Exp $

    Portions Copyright (c) 1995-2005 RealNetworks, Inc. All Rights Reserved.

    The contents of this file, and the files included with this file,
    are subject to the current version of the RealNetworks Public
    Source License (the "RPSL") available at
    http://www.helixcommunity.org/content/rpsl unless you have licensed
    the file under the current version of the RealNetworks Community
    Source License (the "RCSL") available at
    http://www.helixcommunity.org/content/rcsl, in which case the RCSL
    will apply. You may also obtain the license terms directly from
    RealNetworks.  You may not use this file except in compliance with
    the RPSL or, if you have a valid RCSL with RealNetworks applicable
    to this file, the RCSL.  Please see the applicable RPSL or RCSL for
    the rights, obligations and limitations governing use of the
    contents of the file.

    This file is part of the Helix DNA Technology. RealNetworks is the
    developer of the Original Code and owns the copyrights in the
    portions it created.

    This file, and the files included with this file, is distributed
    and made available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY
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    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES
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    ENJOYMENT OR NON-INFRINGEMENT.

    Technology Compatibility Kit Test Suite(s) Location:
      http://www.helixcommunity.org/content/tck

    Contributor(s):

 * ***** END LICENSE BLOCK ***** */

/**************************************************************************************
    Fixed-point HE-AAC decoder
    Jon Recker (jrecker@real.com)
    February 2005

    buffers.c - allocation and deallocation of internal AAC decoder buffers
 **************************************************************************************/

#if defined(USE_DEFAULT_STDLIB) || defined(ARDUINO)
#include <stdlib.h>
#else
#include "hlxclib/stdlib.h"
#endif

#include "coder.h"

/**************************************************************************************
    Function:    ClearBuffer

    Description: fill buffer with 0's

    Inputs:      pointer to buffer
                number of bytes to fill with 0

    Outputs:     cleared buffer

    Return:      none

    Notes:       slow, platform-independent equivalent to memset(buf, 0, nBytes)
 **************************************************************************************/
#include <string.h>
void ClearBuffer(void *buf, int nBytes) {
    /*	 int i;
    	unsigned char *cbuf = (unsigned char *)buf;

    	for (i = 0; i < nBytes; i++)
    		cbuf[i] = 0;

    	return;
    */
    memset(buf, 0, nBytes);
}

/**************************************************************************************
    Function:    AllocateBuffers

    Description: allocate all the memory needed for the AAC decoder

    Inputs:      none

    Outputs:     none

    Return:      pointer to AACDecInfo structure, cleared to all 0's (except for
                  pointer to platform-specific data structure)

    Notes:       if one or more mallocs fail, function frees any buffers already
                  allocated before returning
 **************************************************************************************/
AACDecInfo *AllocateBuffers(void) {
    AACDecInfo *aacDecInfo;

    aacDecInfo = (AACDecInfo *)malloc(sizeof(AACDecInfo));
    if (!aacDecInfo) {
        return 0;
    }
    ClearBuffer(aacDecInfo, sizeof(AACDecInfo));

    aacDecInfo->psInfoBase = malloc(sizeof(PSInfoBase));
    if (!aacDecInfo->psInfoBase) {
        FreeBuffers(aacDecInfo);
        return 0;
    }
    ClearBuffer(aacDecInfo->psInfoBase, sizeof(PSInfoBase));

    return aacDecInfo;
}

AACDecInfo *AllocateBuffersPre(void **ptr, int *sz) {
    AACDecInfo *aacDecInfo;

    char *p = (char*)*ptr;
    aacDecInfo = (AACDecInfo *)p;
    p += (sizeof(AACDecInfo) + 7) & ~7;
    *sz -= (sizeof(AACDecInfo) + 7) & ~7;
    if (*sz < 0) {
        return 0;
    }
    ClearBuffer(aacDecInfo, sizeof(AACDecInfo));

    aacDecInfo->psInfoBase = (PSInfoBase*)p;
    p += (sizeof(PSInfoBase) + 7) & ~7;
    *sz -= (sizeof(PSInfoBase) + 7) & ~7;
    if (*sz < 0) {
        return 0;
    }
    ClearBuffer(aacDecInfo->psInfoBase, sizeof(PSInfoBase));

    *ptr = p;

    return aacDecInfo;
}

#ifndef SAFE_FREE
#define SAFE_FREE(x)	{if (x)	free(x);	(x) = 0;}	/* helper macro */
#endif

/**************************************************************************************
    Function:    FreeBuffers

    Description: frees all the memory used by the AAC decoder

    Inputs:      pointer to initialized AACDecInfo structure

    Outputs:     none

    Return:      none

    Notes:       safe to call even if some buffers were not allocated (uses SAFE_FREE)
 **************************************************************************************/
void FreeBuffers(AACDecInfo *aacDecInfo) {
    if (!aacDecInfo) {
        return;
    }

    SAFE_FREE(aacDecInfo->psInfoBase);
    SAFE_FREE(aacDecInfo);
}
