// Return the value, looking up any indirect ref.
public void GetValue(MHOctetString str, MHEngine engine)
{
if (m_fIsDirect)
{
str.Copy(m_Direct);
}
else
{
MHUnion result = new MHUnion();
MHRoot pBase = engine.FindObject(m_Indirect);
pBase.GetVariableValue(result, engine);
// From my reading of the MHEG documents implicit conversion is only
// performed when assigning variables. Nevertheless the Channel 4
// Teletext assumes that implicit conversion takes place here as well.
if (result.Type == MHUnion.U_Int)
{
// Implicit conversion of string to integer.
MHOctetString s = new MHOctetString("" + result.Int);
str.Copy(s);
}
else
{
result.CheckType(MHUnion.U_String);
str.Copy(result.String);
}
}
}
public MHUnion()
{
m_Type = U_None;
m_StrVal = new MHOctetString();
m_ObjRefVal = new MHObjectRef();
m_ContentRefVal = new MHContentRef();
}
public MHOctetString(MHOctetString str, int nOffset, int nLen)
{
if (nLen < 0)
{
nLen = 0;
}
if (nLen > str.Size)
{
nLen = str.Size;
}
m_String = str.m_String.Substring(nOffset, nLen);
}
// void GetDefaultFont(MHFontBody &font); // Not currently implemented
public void GetDefaultFontAttrs(MHOctetString str)
{
MHApplication pApp = CurrentApp();
if (pApp != null && pApp.FontAttrs.Size > 0)
{
str.Copy(pApp.FontAttrs);
}
else
{
str.Copy("plain.24.24.0"); // TODO: Check this.
}
}
// Return a path relative to the home directory
public string GetPathName(MHOctetString str)
{
string csPath = "";
if (str.Size != 0)
{
csPath = str.ToString();
}
if (csPath.StartsWith("DSM:"))
{
csPath = csPath.Substring(4); // Remove DSM:
}
// If it has any other prefix this isn't a request for a carousel object.
int firstColon = csPath.IndexOf(':'), firstSlash = csPath.IndexOf('/');
if (firstColon > 0 && firstSlash > 0 && firstColon < firstSlash)
{
return("");
}
if (csPath.StartsWith("~"))
{
csPath = csPath.Substring(1); // Remove ~
}
// Ignore "CI://"
if (!csPath.StartsWith("//"))
{ //
// Add the current application's path name
if (CurrentApp() != null)
{
csPath = CurrentApp().Path + csPath;
}
}
// Remove any occurrences of x/../
int nPos;
while ((nPos = csPath.IndexOf("/../")) >= 0)
{
Logging.Log(Logging.MHLogWarning, "/../ found in path " + csPath); // To check.
int nEnd = nPos + 4;
while (nPos >= 1 && csPath[nPos - 1] != '/')
{
nPos--;
}
csPath = csPath.Substring(0, nPos) + csPath.Substring(nEnd);
}
return(csPath);
}
public MHEngine(IMHContext context)
{
m_Context = context;
m_fInTransition = false;
m_fBooting = true;
m_redrawRegion.MakeEmpty();
m_ApplicationStack = new Stack <MHApplication>();
m_ActionStack = new Stack <MHElemAction>();
m_EventQueue = new List <MHAsynchEvent>();
m_LinkTable = new List <MHLink>();
m_ExternContentTable = new List <MHExternContent>();
m_PersistentStore = new MHSequence <MHPSEntry>();
m_CurrentGroupId = new MHOctetString();
}
public void Initialise(MHParseNode p, MHEngine engine)
{
if (p.NodeType == MHParseNode.PNInt)
{
m_nObjectNo = p.GetIntValue();
// Set the group id to the id of this group.
m_GroupId.Copy(engine.GetGroupId());
}
else if (p.NodeType == MHParseNode.PNSeq)
{
MHParseNode pFirst = p.GetSeqN(0);
MHOctetString groupId = new MHOctetString();
pFirst.GetStringValue(m_GroupId);
m_nObjectNo = p.GetSeqN(1).GetIntValue();
}
else
{
p.Failure("ObjectRef: Argument is not int or sequence");
}
}
public bool GetEngineSupport(MHOctetString feature)
{
string csFeat = feature.ToString();
string[] strings = csFeat.Split(new char[] { '(', ')', ',' });
if (strings[0] == "ApplicationStacking" || strings[0] == "ASt")
{
return(true);
}
// We're required to support cloning for Text, Bitmap and Rectangle.
if (strings[0] == "Cloning" || strings[0] == "Clo")
{
return(true);
}
if (strings[0] == "SceneCoordinateSystem" || strings[0] == "SCS")
{
if (strings.Length >= 3 && strings[1] == "720" && strings[2] == "576")
{
return(true);
}
else
{
return(false);
}
// I've also seen SceneCoordinateSystem(1,1)
}
if (strings[0] == "MultipleAudioStreams" || strings[0] == "MAS")
{
if (strings.Length >= 2 && (strings[1] == "0" || strings[1] == "1"))
{
return(true);
}
else
{
return(false);
}
}
if (strings[0] == "MultipleVideoStreams" || strings[0] == "MVS")
{
if (strings.Length >= 2 && (strings[1] == "0" || strings[1] == "1"))
{
return(true);
}
else
{
return(false);
}
}
// We're supposed to return true for all values of N
if (strings[0] == "OverlappingVisibles" || strings[0] == "OvV")
{
return(true);
}
if (strings[0] == "SceneAspectRatio" || strings[0] == "SAR")
{
if (strings.Length < 3)
{
return(false);
}
else if ((strings[1] == "4" && strings[2] == "3") || (strings[1] == "16" && strings[2] == "9"))
{
return(true);
}
else
{
return(false);
}
}
// We're supposed to support these at least. May also support(10,1440,1152)
if (strings[0] == "VideoScaling" || strings[0] == "VSc")
{
if (strings.Length < 4 || strings[1] != "10")
{
return(false);
}
else if ((strings[2] == "720" && strings[3] == "576") || (strings[2] == "360" && strings[3] == "288"))
{
return(true);
}
else
{
return(false);
}
}
if (strings[0] == "BitmapScaling" || strings[0] == "BSc")
{
if (strings.Length < 4 || strings[1] != "2")
{
return(false);
}
else if ((strings[2] == "720" && strings[3] == "576") || (strings[2] == "360" && strings[3] == "288"))
{
return(true);
}
else
{
return(false);
}
}
// I think we only support the video fully on screen
if (strings[0] == "VideoDecodeOffset" || strings[0] == "VDO")
{
if (strings.Length >= 3 && strings[1] == "10" && strings[1] == "0")
{
return(true);
}
else
{
return(false);
}
}
// We support bitmaps that are partially off screen (don't we?)
if (strings[0] == "BitmapDecodeOffset" || strings[0] == "BDO")
{
if (strings.Length >= 3 && strings[1] == "10" && (strings[2] == "0" || strings[2] == "1"))
{
return(true);
}
else
{
return(false);
}
}
if (strings[0] == "UKEngineProfile" || strings[0] == "UEP")
{
if (strings.Length < 2)
{
return(false);
}
if (strings[1] == MHEGEngineProviderIdString)
{
return(true);
}
if (strings[1] == m_Context.GetReceiverId())
{
return(true);
}
if (strings[1] == m_Context.GetDSMCCId())
{
return(true);
}
// The UK profile 1.06 seems a bit confused on this point. It is not clear whether
// we are supposed to return true for UKEngineProfile(2) or not.
if (strings[1] == "2")
{
return(true);
}
else
{
return(false);
}
}
// Otherwise return false.
return(false);
}
public void Append(MHOctetString str)
{
m_String = m_String + str.m_String;
}
public MHObjectRef()
{
m_nObjectNo = 0;
m_GroupId = new MHOctetString();
}
public MHUnion(MHOctetString strVal)
{
m_Type = U_String;
m_StrVal = new MHOctetString();
m_StrVal.Copy(strVal);
}
public MHGenericOctetString() : base()
{
m_Direct = new MHOctetString();
}
// Actions on Ingredients.
public virtual void SetData(MHOctetString included, MHEngine engine)
{
InvalidAction("SetData");
}
public bool Equal(MHOctetString str)
{
return(m_String.Equals(str.m_String));
}
public void Copy(MHOctetString str)
{
m_String = (string)str.m_String.Clone();
}
// Load from or store to the persistent store.
public bool LoadStorePersistent(bool fIsLoad, MHOctetString fileName, MHSequence <MHObjectRef> variables)
{
return(false);
}
public MHPSEntry()
{
m_FileName = new MHOctetString();
}
public int Compare(MHOctetString str)
{
return(m_String.CompareTo(str.m_String));
}
public MHColour()
{
m_nColIndex = -1;
m_ColStr = new MHOctetString();
}
public MHContentRef()
{
m_ContentRef = new MHOctetString();
}
public void SetFromIndex(int index)
{
m_nColIndex = index;
m_ColStr = new MHOctetString();
}
public virtual void SetFontAttributes(MHOctetString fontAttrs, MHEngine engine)
{
InvalidAction("SetFontAttributes");
}
public MHFontBody()
{
m_DirFont = new MHOctetString();
m_IndirFont = new MHObjectRef();
}