public static ImageResource CreateImageResource(PsdBinaryReader reader) { Util.DebugMessage(reader.BaseStream, "Load, Begin, ImageResource"); var signature = reader.ReadAsciiChars(4); var resourceIdInt = reader.ReadUInt16(); var name = reader.ReadPascalString(2); var dataLength = (int)reader.ReadUInt32(); var dataPaddedLength = Util.RoundUp(dataLength, 2); var endPosition = reader.BaseStream.Position + dataPaddedLength; ImageResource resource = null; var resourceId = (ResourceID)resourceIdInt; switch (resourceId) { case ResourceID.ResolutionInfo: resource = new ResolutionInfo(reader, name); break; case ResourceID.AlphaChannelNames: resource = new AlphaChannelNames(reader, name, dataLength); break; case ResourceID.UnicodeAlphaNames: resource = new UnicodeAlphaNames(reader, name, dataLength); break; case ResourceID.VersionInfo: resource = new VersionInfo(reader, name); break; default: resource = new RawImageResource(reader, signature, resourceId, name, dataLength); break; } Util.DebugMessage(reader.BaseStream, "Load, End, ImageResource, {0}", resourceId); // Reposition the reader if we do not consume the full resource block. // This takes care of the even-padding, and also preserves forward- // compatibility in case a resource block is later extended with // additional properties. if (reader.BaseStream.Position < endPosition) { reader.BaseStream.Position = endPosition; } // However, overruns are definitely an error. if (reader.BaseStream.Position > endPosition) { throw new PsdInvalidException("Corruption detected in resource."); } return(resource); }
public AlphaChannelNames(PsdBinaryReader reader, string name, int resourceDataLength) : base(name) { var endPosition = reader.BaseStream.Position + resourceDataLength; // Alpha channel names are Pascal strings, with no padding in-between. while (reader.BaseStream.Position < endPosition) { var channelName = reader.ReadPascalString(1); ChannelNames.Add(channelName); } }
public Layer(PsdBinaryReader reader, PsdFile psdFile) : this(psdFile) { Util.DebugMessage(reader.BaseStream, "Load, Begin, Layer"); Rect = reader.ReadRectangle(); //----------------------------------------------------------------------- // Read channel headers. Image data comes later, after the layer header. Int32 numberOfChannels = reader.ReadUInt16(); for (Int32 channel = 0; channel < numberOfChannels; channel++) { var ch = new Channel(reader, this); Channels.Add(ch); } //----------------------------------------------------------------------- // var signature = reader.ReadAsciiChars(4); if (signature != "8BIM") { throw (new PsdInvalidException("Invalid signature in layer header.")); } BlendModeKey = reader.ReadAsciiChars(4); Opacity = reader.ReadByte(); Clipping = reader.ReadBoolean(); var flagsByte = reader.ReadByte(); _flags = new BitVector32(flagsByte); reader.ReadByte(); //padding //----------------------------------------------------------------------- // This is the total size of the MaskData, the BlendingRangesData, the // Name and the AdjustmentLayerInfo. var extraDataSize = reader.ReadUInt32(); var extraDataStartPosition = reader.BaseStream.Position; Masks = new MaskInfo(reader, this); BlendingRangesData = new BlendingRanges(reader, this); Name = reader.ReadPascalString(4); //----------------------------------------------------------------------- // Process Additional Layer Information Int64 adjustmentLayerEndPos = extraDataStartPosition + extraDataSize; while (reader.BaseStream.Position < adjustmentLayerEndPos) { var layerInfo = LayerInfoFactory.Load(reader, psdFile: PsdFile, globalLayerInfo: false); AdditionalInfo.Add(layerInfo); } foreach (var adjustmentInfo in AdditionalInfo) { switch (adjustmentInfo.Key) { case "luni": Name = ((LayerUnicodeName)adjustmentInfo).Name; break; } } Util.DebugMessage(reader.BaseStream, "Load, End, Layer, {0}", Name); PsdFile.LoadContext.OnLoadLayerHeader(this); }