public static DwgObjectCache Parse(BitReader reader, DwgVersionId version)
{
var objectCache = new DwgObjectCache(version);
var lastHandle = 0;
var lastLocation = 0;
reader.StartCrcCheck();
var sectionSize = reader.ReadShortBigEndian();
while (sectionSize != 2)
{
var sectionStart = reader.Offset;
var sectionEnd = sectionStart + sectionSize - 2;
while (reader.Offset < sectionEnd)
{
// read data
var handleOffset = reader.Read_MC(allowNegation: false);
var locationOffset = reader.Read_MC();
var handle = lastHandle + handleOffset;
var location = lastLocation + locationOffset;
objectCache._handleToOffset.Add(handle, location);
lastHandle = handle;
lastLocation = location;
}
reader.ValidateCrc(initialValue: DwgHeaderVariables.InitialCrcValue, readCrcAsMsb: true);
reader.StartCrcCheck();
sectionSize = reader.ReadShortBigEndian();
}
reader.ValidateCrc(initialValue: DwgHeaderVariables.InitialCrcValue, readCrcAsMsb: true);
return(objectCache);
}
private void LoadObjects(BitReader reader, DwgObjectCache objectCache)
{
AssertHandleType(Variables.BlockControlObjectHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.BlockControlObjectHandle));
AssertHandleType(Variables.LayerControlObjectHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.LayerControlObjectHandle));
AssertHandleType(Variables.StyleObjectControlHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.StyleObjectControlHandle));
AssertHandleType(Variables.LineTypeObjectControlHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.LineTypeObjectControlHandle));
AssertHandleType(Variables.ViewControlObjectHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.ViewControlObjectHandle));
AssertHandleType(Variables.UcsControlObjectHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.UcsControlObjectHandle));
AssertHandleType(Variables.ViewPortControlObjectHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.ViewPortControlObjectHandle));
AssertHandleType(Variables.AppIdControlObjectHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.AppIdControlObjectHandle));
AssertHandleType(Variables.DimStyleControlObjectHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.DimStyleControlObjectHandle));
AssertHandleType(Variables.ViewPortEntityHeaderControlObjectHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.ViewPortEntityHeaderControlObjectHandle));
AssertHandleType(Variables.GroupDictionaryHandle, DwgHandleReferenceCode.SoftOwner, nameof(Variables.GroupDictionaryHandle));
AssertHandleType(Variables.MLineStyleDictionaryHandle, DwgHandleReferenceCode.SoftOwner, nameof(Variables.MLineStyleDictionaryHandle));
AssertHandleType(Variables.NamedObjectsDictionaryHandle, DwgHandleReferenceCode.SoftPointer, nameof(Variables.NamedObjectsDictionaryHandle));
AssertHandleType(Variables.PaperSpaceBlockRecordHandle, DwgHandleReferenceCode.SoftOwner, nameof(Variables.PaperSpaceBlockRecordHandle));
AssertHandleType(Variables.ModelSpaceBlockRecordHandle, DwgHandleReferenceCode.SoftOwner, nameof(Variables.ModelSpaceBlockRecordHandle));
AssertHandleType(Variables.ByLayerLineTypeHandle, DwgHandleReferenceCode.SoftOwner, nameof(Variables.ByLayerLineTypeHandle));
AssertHandleType(Variables.ByBlockLineTypeHandle, DwgHandleReferenceCode.SoftOwner, nameof(Variables.ByBlockLineTypeHandle));
AssertHandleType(Variables.ContinuousLineTypeHandle, DwgHandleReferenceCode.SoftOwner, nameof(Variables.ContinuousLineTypeHandle));
BlockHeaders = objectCache.GetObject <DwgBlockControlObject>(reader, Variables.BlockControlObjectHandle.HandleOrOffset);
Layers = objectCache.GetObject <DwgLayerControlObject>(reader, Variables.LayerControlObjectHandle.HandleOrOffset);
Styles = objectCache.GetObject <DwgStyleControlObject>(reader, Variables.StyleObjectControlHandle.HandleOrOffset);
LineTypes = objectCache.GetObject <DwgLineTypeControlObject>(reader, Variables.LineTypeObjectControlHandle.HandleOrOffset);
Views = objectCache.GetObject <DwgViewControlObject>(reader, Variables.ViewControlObjectHandle.HandleOrOffset);
UCSs = objectCache.GetObject <DwgUCSControlObject>(reader, Variables.UcsControlObjectHandle.HandleOrOffset);
ViewPorts = objectCache.GetObject <DwgViewPortControlObject>(reader, Variables.ViewPortControlObjectHandle.HandleOrOffset);
AppIds = objectCache.GetObject <DwgAppIdControlObject>(reader, Variables.AppIdControlObjectHandle.HandleOrOffset);
DimStyles = objectCache.GetObject <DwgDimStyleControlObject>(reader, Variables.DimStyleControlObjectHandle.HandleOrOffset);
ViewPortEntityHeaders = objectCache.GetObject <DwgViewPortEntityHeaderControlObject>(reader, Variables.ViewPortEntityHeaderControlObjectHandle.HandleOrOffset);
GroupDictionary = objectCache.GetObject <DwgDictionary>(reader, Variables.GroupDictionaryHandle.HandleOrOffset);
MLineStyleDictionary = objectCache.GetObject <DwgDictionary>(reader, Variables.MLineStyleDictionaryHandle.HandleOrOffset);
NamedObjectDictionary = objectCache.GetObject <DwgDictionary>(reader, Variables.NamedObjectsDictionaryHandle.HandleOrOffset);
PaperSpaceBlockRecord = objectCache.GetObject <DwgBlockHeader>(reader, Variables.PaperSpaceBlockRecordHandle.HandleOrOffset);
ModelSpaceBlockRecord = objectCache.GetObject <DwgBlockHeader>(reader, Variables.ModelSpaceBlockRecordHandle.HandleOrOffset);
ByLayerLineType = objectCache.GetObject <DwgLineType>(reader, Variables.ByLayerLineTypeHandle.HandleOrOffset);
ByBlockLineType = objectCache.GetObject <DwgLineType>(reader, Variables.ByBlockLineTypeHandle.HandleOrOffset);
ContinuousLineType = objectCache.GetObject <DwgLineType>(reader, Variables.ContinuousLineTypeHandle.HandleOrOffset);
CurrentViewPort = objectCache.GetObjectOrDefault <DwgViewPort>(reader, Variables.CurrentViewPortEntityHandle.HandleOrOffset);
CurrentLayer = objectCache.GetObject <DwgLayer>(reader, Variables.CurrentLayerHandle.HandleOrOffset);
TextStyle = objectCache.GetObject <DwgStyle>(reader, Variables.TextStyleHandle.HandleOrOffset);
CurrentEntityLineType = objectCache.GetObject <DwgLineType>(reader, Variables.CurrentEntityLineTypeHandle.HandleOrOffset);
DimensionStyle = objectCache.GetObject <DwgDimStyle>(reader, Variables.DimensionStyleHandle.HandleOrOffset);
CurrentMultiLineStyle = objectCache.GetObject <DwgMLineStyle>(reader, Variables.CurrentMultiLineStyleHandle.HandleOrOffset);
PaperSpaceCurrentUCS = objectCache.GetObjectOrDefault <DwgUCS>(reader, Variables.PaperSpaceCurrentUCSHandle.HandleOrOffset);
CurrentUCS = objectCache.GetObjectOrDefault <DwgUCS>(reader, Variables.CurrentUCSHandle.HandleOrOffset);
DimensionTextStyle = objectCache.GetObject <DwgStyle>(reader, Variables.DimensionTextStyleHandle.HandleOrOffset);
}
public static DwgDrawing Load(byte[] data)
{
var reader = new BitReader(data);
var drawing = new DwgDrawing();
drawing.FileHeader = DwgFileHeader.Parse(reader);
drawing.Variables = DwgHeaderVariables.Parse(reader.FromOffset(drawing.FileHeader.HeaderVariablesLocator.Pointer), drawing.FileHeader.Version);
drawing.Classes = DwgClasses.Parse(reader.FromOffset(drawing.FileHeader.ClassSectionLocator.Pointer), drawing.FileHeader.Version);
// don't read the R13C3 and later unknown section
drawing.FileHeader.ValidateSecondHeader(reader, drawing.Variables);
drawing.ImageData = DwgImageData.Parse(reader.FromOffset(drawing.FileHeader.ImagePointer));
var objectCache = DwgObjectCache.Parse(reader.FromOffset(drawing.FileHeader.ObjectMapLocator.Pointer), drawing.FileHeader.Version);
drawing.LoadObjects(reader, objectCache);
return(drawing);
}