src/add-ons/media/plugins/matroska/libebml/EbmlUInteger.cpp

   1 /****************************************************************************
   2 ** libebml : parse EBML files, see http://embl.sourceforge.net/
   3 **
   4 ** <file/class description>
   5 **
   6 ** Copyright (C) 2002-2005 Steve Lhomme.  All rights reserved.
   7 **
   8 ** This file is part of libebml.
   9 **
  10 ** This library is free software; you can redistribute it and/or
  11 ** modify it under the terms of the GNU Lesser General Public
  12 ** License as published by the Free Software Foundation; either
  13 ** version 2.1 of the License, or (at your option) any later version.
  14 **
  15 ** This library is distributed in the hope that it will be useful,
  16 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 ** Lesser General Public License for more details.
  19 **
  20 ** You should have received a copy of the GNU Lesser General Public
  21 ** License along with this library; if not, write to the Free Software
  22 ** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23 **
  24 ** See http://www.matroska.org/license/lgpl/ for LGPL licensing information.
  25 **
  26 ** Contact license@matroska.org if any conditions of this licensing are
  27 ** not clear to you.
  28 **
  29 **********************************************************************/
  30
  31 /*!
  32         \file
  33         \version \$Id: EbmlUInteger.cpp 1079 2005-03-03 13:18:14Z robux4 $
  34         \author Steve Lhomme     <robux4 @ users.sf.net>
  35         \author Moritz Bunkus <moritz @ bunkus.org>
  36 */
  37 #include <cassert>
  38
  39 #include "ebml/EbmlUInteger.h"
  40
  41 START_LIBEBML_NAMESPACE
  42
  43 EbmlUInteger::EbmlUInteger()
  44  :EbmlElement(DEFAULT_UINT_SIZE, false)
  45 {}
  46
  47 EbmlUInteger::EbmlUInteger(const uint64 aDefaultValue)
  48  :EbmlElement(DEFAULT_UINT_SIZE, true), Value(aDefaultValue), DefaultValue(aDefaultValue)
  49 {
  50         DefaultIsSet = true;
  51 }
  52
  53 EbmlUInteger::EbmlUInteger(const EbmlUInteger & ElementToClone)
  54  :EbmlElement(ElementToClone)
  55  ,Value(ElementToClone.Value)
  56  ,DefaultValue(ElementToClone.DefaultValue)
  57 {
  58 }
  59
  60 /*!
  61         \todo handle exception on errors
  62 */
  63 uint32 EbmlUInteger::RenderData(IOCallback & output, bool bForceRender, bool bKeepIntact)
  64 {
  65         binary FinalData[8]; // we don't handle more than 64 bits integers
  66
  67         if (SizeLength > 8)
  68                 return 0; // integer bigger coded on more than 64 bits are not supported
  69
  70         uint64 TempValue = Value;
  71         for (unsigned int i=0; i<Size;i++) {
  72                 FinalData[Size-i-1] = TempValue & 0xFF;
  73                 TempValue >>= 8;
  74         }
  75
  76         output.writeFully(FinalData,Size);
  77
  78         return Size;
  79 }
  80
  81 uint64 EbmlUInteger::UpdateSize(bool bKeepIntact, bool bForceRender)
  82 {
  83         if (!bKeepIntact && IsDefaultValue())
  84                 return 0;
  85
  86         if (Value <= 0xFF) {
  87                 Size = 1;
  88         } else if (Value <= 0xFFFF) {
  89                 Size = 2;
  90         } else if (Value <= 0xFFFFFF) {
  91                 Size = 3;
  92         } else if (Value <= 0xFFFFFFFF) {
  93                 Size = 4;
  94         } else if (Value <= EBML_PRETTYLONGINT(0xFFFFFFFFFF)) {
  95                 Size = 5;
  96         } else if (Value <= EBML_PRETTYLONGINT(0xFFFFFFFFFFFF)) {
  97                 Size = 6;
  98         } else if (Value <= EBML_PRETTYLONGINT(0xFFFFFFFFFFFFFF)) {
  99                 Size = 7;
 100         } else {
 101                 Size = 8;
 102         }
 103
 104         if (DefaultSize > Size) {
 105                 Size = DefaultSize;
 106         }
 107
 108         return Size;
 109 }
 110
 111 uint64 EbmlUInteger::ReadData(IOCallback & input, ScopeMode ReadFully)
 112 {
 113         if (ReadFully != SCOPE_NO_DATA)
 114         {
 115                 binary Buffer[8];
 116                 input.readFully(Buffer, Size);
 117                 Value = 0;
 118
 119                 for (unsigned int i=0; i<Size; i++)
 120                 {
 121                         Value <<= 8;
 122                         Value |= Buffer[i];
 123                 }
 124                 bValueIsSet = true;
 125         }
 126
 127         return Size;
 128 }
 129
 130 END_LIBEBML_NAMESPACE