Darwin-Streaming-Server/QTFileLib/QTAtom_stco.cpp

/*
 *
 * @APPLE_LICENSE_HEADER_START@
 *
 * Copyright (c) 1999-2008 Apple 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.
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 *
 */
//
// QTAtom_stco:
//   The 'stco' QTAtom class.


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

#include "QTAtom.h"
#include "QTAtom_stco.h"
#include "OSMemory.h"


// -------------------------------------
// Constants
//
const int       stcoPos_VersionFlags        =  0;
const int       stcoPos_NumEntries          =  4;
const int       stcoPos_SampleTable         =  8;



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



// -------------------------------------
// Constructors and destructors
//
QTAtom_stco::QTAtom_stco(QTFile * File, QTFile::AtomTOCEntry * TOCEntry, UInt16 offSetSize, Bool16 Debug, Bool16 DeepDebug)
    : QTAtom(File, TOCEntry, Debug, DeepDebug),
      fNumEntries(0),fOffSetSize(offSetSize), fChunkOffsetTable(NULL), fTable(NULL)
{
}

QTAtom_stco::~QTAtom_stco(void)
{
    //
    // Free our variables.
    if( fChunkOffsetTable != NULL )
        delete[] fChunkOffsetTable;
}



// -------------------------------------
// Initialization functions
//
Bool16 QTAtom_stco::Initialize(void)
{
    // Temporary vars
    UInt32      tempInt32;


    //
    // Parse this atom's fields.
    ReadInt32(stcoPos_VersionFlags, &tempInt32);
    fVersion = (UInt8)((tempInt32 >> 24) & 0x000000ff);
    fFlags = tempInt32 & 0x00ffffff;

    ReadInt32(stcoPos_NumEntries, &fNumEntries);

    //
    // Validate the size of the sample table.
    if( (UInt32)(fNumEntries * fOffSetSize) != (fTOCEntry.AtomDataLength - 8) )
        return false;

    //
    // Read in the chunk offset table.
    fChunkOffsetTable = NEW char[(fNumEntries * fOffSetSize) + 1];
    if( fChunkOffsetTable == NULL )
        return false;
    
    if( ((PointerSizedInt)fChunkOffsetTable & (PointerSizedInt)0x3) == 0)
        fTable = (void *)fChunkOffsetTable;
    else
        fTable = (void *)(((PointerSizedInt)fChunkOffsetTable + 4) & ~((PointerSizedInt)0x3));
        
    ReadBytes(stcoPos_SampleTable, (char *)fTable, fNumEntries * fOffSetSize);

    //
    // This atom has been successfully read in.
    return true;
}



// -------------------------------------
// Debugging functions
//
void QTAtom_stco::DumpAtom(void)
{
    DEBUG_PRINT(("QTAtom_stco::DumpAtom - Dumping atom.\n"));
    DEBUG_PRINT(("QTAtom_stco::DumpAtom - ..Number of chunk offset entries: %"_S32BITARG_"\n", fNumEntries));
}

void QTAtom_stco::DumpTable(void)
{
    //
    // Print out a header.
    qtss_printf("-- Chunk Offset table ----------------------------------------------------------\n");
    qtss_printf("\n");
    qtss_printf("  Chunk Num.     Offset\n");
    qtss_printf("  ----------   ----------\n");
    
    //
    // Print the table.
    UInt64 offset = 0;
    for( UInt32 CurEntry = 1; CurEntry <= fNumEntries; CurEntry++ )
    {
        if (ChunkOffset(CurEntry, &offset))
            qtss_printf("  %10"_U32BITARG_": %"_64BITARG_"u\n", CurEntry, offset);
        else
            qtss_printf("  %10"_U32BITARG_": QTAtom_stco::DumpTable ChunkOffset error\n", CurEntry);
    }
}