/*
 *
 * @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.cpp,v 1.11 2003/08/15 23:53:14 sbasu Exp $
//
// QTAtom:
//   The base-class for atoms in a QuickTime file.


// -------------------------------------
// Includes
//
#include <stdio.h>
#include <stdlib.h>
#include "SafeStdLib.h"
#include <string.h>

#ifndef __Win32__
#include <sys/types.h>
#include <netinet/in.h>
#endif

#include "QTFile.h"
#include "QTAtom.h"



// -------------------------------------
// Macros
//
#define DEBUG_PRINT(s) if(fDebug) qtss_printf s
#define DEEP_DEBUG_PRINT(s) if(fDeepDebug) qtss_printf s



// -------------------------------------
// Constructors and destructors
//
QTAtom::QTAtom(QTFile * File, QTFile::AtomTOCEntry * Atom, Bool16 Debug, Bool16 DeepDebug)
    : fDebug(Debug), fDeepDebug(DeepDebug),
      fFile(File)
{
    //
    // Make a copy of the TOC entry.
    memcpy(&fTOCEntry, Atom, sizeof(QTFile::AtomTOCEntry));
}

QTAtom::~QTAtom(void)
{
}



// -------------------------------------
// Read functions
//
Bool16 QTAtom::ReadBytes(UInt64 Offset, char * Buffer, UInt32 Length)
{
    //
    // Validate the arguments.
    if( (Offset + Length) > fTOCEntry.AtomDataLength )
        return false;

    //
    // Read and return this data.
    return fFile->Read(fTOCEntry.AtomDataPos + Offset, Buffer, Length);
}

Bool16 QTAtom::ReadInt8(UInt64 Offset, UInt8 * Datum)
{
    //
    // Read and return.
    return ReadBytes(Offset, (char *)Datum, 1);
}

Bool16 QTAtom::ReadInt16(UInt64 Offset, UInt16 * Datum)
{
    // General vars
    UInt16      tempDatum;


    //
    // Read and flip.
    if( !ReadBytes(Offset, (char *)&tempDatum, 2) )
        return false;
    
    *Datum = ntohs(tempDatum);
    return true;
}

Bool16 QTAtom::ReadInt32(UInt64 Offset, UInt32 * Datum)
{
    // General vars
    UInt32      tempDatum;


    //
    // Read and flip.
    if( !ReadBytes(Offset, (char *)&tempDatum, 4) )
        return false;
    
    *Datum = ntohl(tempDatum);
    return true;
}

Bool16 QTAtom::ReadInt32To64(UInt64 Offset, UInt64 * Datum)
{
    // General vars
    UInt32      tempDatum;


    //
    // Read and flip.
    if( !ReadBytes(Offset, (char *)&tempDatum, 4) )
        return false;
    
    tempDatum =  ntohl(tempDatum);
    *Datum = (UInt64) tempDatum;
    return true;
}

Bool16 QTAtom::ReadInt64(UInt64 Offset, UInt64 * Datum)
{
    // General vars
    UInt64      tempDatum;


    //
    // Read and flip.
    if( !ReadBytes(Offset, (char *)&tempDatum, 8) )
        return false;
    
    *Datum = (UInt64) QTAtom::NTOH64(tempDatum);
    return true;
}


Bool16 QTAtom::ReadSubAtomBytes(const char * AtomPath, char * Buffer, UInt32 Length)
{
    // General vars
    QTFile::AtomTOCEntry    *atomTOCEntry;
    

    //
    // Find the TOC entry for this sub-atom.
    if( !fFile->FindTOCEntry(AtomPath, &atomTOCEntry, &fTOCEntry) )
        return false;
    
    //
    // Validate the arguments.
    if( (atomTOCEntry->AtomDataPos <= fTOCEntry.AtomDataPos) || ((atomTOCEntry->AtomDataPos + Length) > (fTOCEntry.AtomDataPos + fTOCEntry.AtomDataLength)) )
        return false;

    //
    // Read and return this data.
    return fFile->Read(atomTOCEntry->AtomDataPos, Buffer, Length);
}

Bool16 QTAtom::ReadSubAtomInt8(const char * AtomPath, UInt8 * Datum)
{
    //
    // Read and return.
    return ReadSubAtomBytes(AtomPath, (char *)Datum, 1);
}

Bool16 QTAtom::ReadSubAtomInt16(const char * AtomPath, UInt16 * Datum)
{
    // General vars
    UInt16      tempDatum;


    //
    // Read and flip.
    if( !ReadSubAtomBytes(AtomPath, (char *)&tempDatum, 2) )
        return false;
    
    *Datum = ntohs(tempDatum);
    return true;
}

Bool16 QTAtom::ReadSubAtomInt32(const char * AtomPath, UInt32 * Datum)
{
    // General vars
    UInt32      tempDatum;


    //
    // Read and flip.
    if( !ReadSubAtomBytes(AtomPath, (char *)&tempDatum, 4) )
        return false;
    
    *Datum = ntohl(tempDatum);
    return true;
}

Bool16 QTAtom::ReadSubAtomInt64(const char * AtomPath, UInt64 * Datum)
{
    // General vars
    UInt64      tempDatum;


    //
    // Read and flip.
    if( !ReadSubAtomBytes(AtomPath, (char *)&tempDatum, 8) )
        return false;
    
    *Datum = (UInt32) QTAtom::NTOH64(tempDatum);
    return true;
}

