/*
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 *
 */
// $Id: QTAtom.h,v 1.9 2003/08/15 23:53:14 sbasu Exp $
//
// QTAtom:
//   The base-class for atoms in a QuickTime file.

#ifndef QTAtom_H
#define QTAtom_H


//
// Includes
#include "OSHeaders.h"

#include "QTFile.h"


//
// QTAtom class
class QTAtom {

public:
    //
    // Constructors and destructor.
                        QTAtom(QTFile * File, QTFile::AtomTOCEntry * Atom,
                               Bool16 Debug = false, Bool16 DeepDebug = false);
    virtual             ~QTAtom(void);


    //
    // Initialization functions.
    virtual Bool16      Initialize(void) { return true; }

    static SInt64   NTOH64(SInt64 networkOrdered)
    {
    #if BIGENDIAN
        return networkOrdered;
    #else
        return (SInt64) (  (UInt64)  (networkOrdered << 56) | (UInt64)  (((UInt64) 0x00ff0000 << 32) & (networkOrdered << 40))
            | (UInt64)  ( ((UInt64)  0x0000ff00 << 32) & (networkOrdered << 24)) | (UInt64)  (((UInt64)  0x000000ff << 32) & (networkOrdered << 8))
            | (UInt64)  ( ((UInt64)  0x00ff0000 << 8) & (networkOrdered >> 8)) | (UInt64)     ((UInt64)  0x00ff0000 & (networkOrdered >> 24))
            | (UInt64)  (  (UInt64)  0x0000ff00 & (networkOrdered >> 40)) | (UInt64)  ((UInt64)  0x00ff & (networkOrdered >> 56)) );
    #endif
    }

    //
    // Read functions.
            Bool16      ReadBytes(UInt64 Offset, char * Buffer, UInt32 Length);
            Bool16      ReadInt8(UInt64 Offset, UInt8 * Datum);
            Bool16      ReadInt16(UInt64 Offset, UInt16 * Datum);
            Bool16      ReadInt32(UInt64 Offset, UInt32 * Datum);
            Bool16      ReadInt64(UInt64 Offset, UInt64 * Datum);
            Bool16      ReadInt32To64(UInt64 Offset, UInt64 * Datum);
            
            Bool16      ReadSubAtomBytes(const char * AtomPath, char * Buffer, UInt32 Length);
            Bool16      ReadSubAtomInt8(const char * AtomPath, UInt8 * Datum);
            Bool16      ReadSubAtomInt16(const char * AtomPath, UInt16 * Datum);
            Bool16      ReadSubAtomInt32(const char * AtomPath, UInt32 * Datum);
            Bool16      ReadSubAtomInt64(const char * AtomPath, UInt64 * Datum);
            
    //
    // Debugging functions.
    virtual void        DumpAtom(void) {}


protected:
    //
    // Protected member variables.
    Bool16              fDebug, fDeepDebug;
    QTFile              *fFile;

    QTFile::AtomTOCEntry fTOCEntry;
};

#endif // QTAtom_H
