/******************************************************************************
 *
 * COPYRIGHT: Unless otherwise noted, all files are Copyright (c) 1992-1999
 * Amiga, Inc.  All rights reserved.
 *
 * DISCLAIMER: This software is provided "as is".  No representations or
 * warranties are made with respect to the accuracy, reliability, performance,
 * currentness, or operation of this software, and all use is at your own risk.
 * Neither Amiga nor the authors assume any responsibility or liability
 * whatsoever with respect to your use of this software.
 *
 ******************************************************************************
 * classbase.c
 *
 */

#include "classbase.h"

/****** wav.datatype/wav.datatype ****************************************
*
*    NAME
*	wav.datatype -- data type for wav sounds.
*
*    FUNCTION
*	The wav data type, a sub-class of the sound.datatype, is used
*	to load Windows WAV files.
*
*    METHODS
*	OM_NEW -- Create a new sound object from a WAV file.  The
*	    source may be either a file or the clipboard.
*
*    SEE ALSO
*	sound.datatype.
*
*******************************************************************************
*
* Created:  27-Feb-92, David N. Junod
*
*/

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

Class *ASM ObtainWAVEngine (REG (a6) struct ClassBase *cb)
{
    return (cb->cb_Class);
}

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

struct Library *ASM LibInit (REG (d0) struct ClassBase *cb, REG (a0) BPTR seglist, REG (a6) struct Library * sysbase)
{
    cb->cb_SegList = seglist;
    SysBase = (struct ExecBase *)sysbase;
    InitSemaphore (&cb->cb_Lock);
    if (((struct Library *)SysBase)->lib_Version >= 39)
    {
	DOSBase       = OpenLibrary ("dos.library",      39);
	UtilityBase   = OpenLibrary ("utility.library",  39);
	IntuitionBase = OpenLibrary ("intuition.library",39);

	if(DOSBase && UtilityBase && IntuitionBase)
	    return cb;

	CloseLibrary(DOSBase);
	CloseLibrary(UtilityBase);
	CloseLibrary(IntuitionBase);
    }

    return NULL;
}

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

LONG ASM LibOpen (REG (a6) struct ClassBase *cb)
{
    LONG retval = (LONG) cb;
    BOOL success = TRUE;

    ObtainSemaphore (&cb->cb_Lock);

    /* Use an internal use counter */
    cb->cb_Lib.lib_OpenCnt++;
    cb->cb_Lib.lib_Flags &= ~LIBF_DELEXP;

    if (cb->cb_Lib.lib_OpenCnt == 1)
    {
	if (cb->cb_Class == NULL)
	{
	    success = FALSE;
            if (DataTypesBase = OpenLibrary ("datatypes.library", 0))
                if (cb->cb_SuperClassBase = OpenLibrary ("datatypes/sound.datatype", 39))
                    if (cb->cb_Class = initClass (cb))
                        success = TRUE;
	}
    }

    if (!success)
    {
	CloseLibrary (cb->cb_SuperClassBase);
	CloseLibrary (DataTypesBase);
	cb->cb_Lib.lib_OpenCnt--;
	retval = NULL;
    }

    ReleaseSemaphore (&cb->cb_Lock);

    return (retval);
}

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

LONG ASM LibClose (REG (a6) struct ClassBase *cb)
{
    LONG retval = NULL;

    ObtainSemaphore (&cb->cb_Lock);

    if (cb->cb_Lib.lib_OpenCnt)
	cb->cb_Lib.lib_OpenCnt--;

    if ((cb->cb_Lib.lib_OpenCnt == 0) && cb->cb_Class)
    {
	if (FreeClass (cb->cb_Class))
	{
	    CloseLibrary (cb->cb_SuperClassBase);
	    CloseLibrary (DataTypesBase);
	    cb->cb_Class = NULL;
	}
	else
	{
	    cb->cb_Lib.lib_Flags |= LIBF_DELEXP;
	}
    }

    if (cb->cb_Lib.lib_Flags & LIBF_DELEXP)
	retval = LibExpunge (cb);

    ReleaseSemaphore (&cb->cb_Lock);

    return (retval);
}

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

LONG ASM LibExpunge (REG (a6) struct ClassBase *cb)
{
    BPTR seg = cb->cb_SegList;

    if (cb->cb_Lib.lib_OpenCnt)
    {
	cb->cb_Lib.lib_Flags |= LIBF_DELEXP;
	return (NULL);
    }

    Remove ((struct Node *) cb);

    CloseLibrary (IntuitionBase);
    CloseLibrary (UtilityBase);
    CloseLibrary (DOSBase);

    FreeMem ((APTR)((ULONG)(cb) - (ULONG)(cb->cb_Lib.lib_NegSize)), cb->cb_Lib.lib_NegSize + cb->cb_Lib.lib_PosSize);

    return ((LONG) seg);
}