/// <summary> /// Loads packets from the input stream. For example, packets are all of the x's in a stroke /// </summary> #else /// <summary> /// Loads packets from the input stream. For example, packets are all of the x's in a stroke /// </summary> #endif static uint LoadPackets(Stream inputStream, uint totalBytesInStrokeBlockOfIsfStream, #if OLD_ISF Compressor compressor, #endif StylusPointDescription stylusPointDescription, Matrix transform, out StylusPointCollection stylusPoints) { stylusPoints = null; if (0 == totalBytesInStrokeBlockOfIsfStream) { return(0); } uint locallyDecodedBytesRemaining = totalBytesInStrokeBlockOfIsfStream; uint localBytesRead; // First read the no of packets uint pointCount; localBytesRead = SerializationHelper.Decode(inputStream, out pointCount); if (locallyDecodedBytesRemaining < localBytesRead) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } locallyDecodedBytesRemaining -= localBytesRead; if (0 == locallyDecodedBytesRemaining) { return(localBytesRead); } // Allocate packet properties int intsPerPoint = 0; //修复构建的代码 stylusPointDescription.GetInputArrayLengthPerPoint(); int buttonCount = 0; //修复构建的代码 stylusPointDescription.ButtonCount; int buttonIntsPerPoint = (buttonCount > 0 ? 1 : 0); int valueIntsPerPoint = intsPerPoint - buttonIntsPerPoint; //add one int per point for button data if it exists int[] rawPointData = new int[pointCount * intsPerPoint]; int[] packetDataSet = new int[pointCount]; // copy the rest of the data from the stroke data byte[] inputBuffer = new byte[locallyDecodedBytesRemaining]; // Read the input data into the byte array uint bytesRead = StrokeCollectionSerializer.ReliableRead(inputStream, inputBuffer, locallyDecodedBytesRemaining); if (bytesRead != locallyDecodedBytesRemaining) { // Make sure the bytes read are expected. If not, we should bail out. // An exception will be thrown. throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } // at this point, we have read all of the bytes remaining in the input // stream's packet block, and while we will keep the bytes remaining // variable for positioning within the local byte buffer, we should // not read from the stream again, or we risk reading into another // ISF tag's block. int originalPressureIndex = 0; //修复构建的代码 stylusPointDescription.OriginalPressureIndex; for (int i = 0; i < valueIntsPerPoint && locallyDecodedBytesRemaining > 0; i++) { localBytesRead = locallyDecodedBytesRemaining; Compressor.DecompressPacketData( #if OLD_ISF compressor, #endif inputBuffer, ref localBytesRead, packetDataSet); if (localBytesRead > locallyDecodedBytesRemaining) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } // // packetDataSet is like this: // ------------- // |X|X|X|X|X|X| // ------------- // // we need to copy into rawPointData at // // ------------- // |X| |X| |X| | // ------------- // // additionally, for NormalPressure, if it exists and was // reordered in the StylusPointDescription, we need to account for that here // int tempi = i; if (tempi > 1 && originalPressureIndex != -1 && originalPressureIndex != /* //修复构建的代码StylusPointDescription.RequiredPressureIndex*/ 2) { // // NormalPressure exists in the packet stream and was not at index 2 // StylusPointDescription enforces that NormalPressure is at index 2 // so we need to copy packet data beyond X and Y into a different location // // take the example of the original StylusPointDescription // |X|Y|XTilt|YTilt|NormalPressure|Rotation| // // originalPressureIndex is 4, and we know it is now 2 // which means that everything before index 4 has been shifted one // and everything after index 4 is still good. Index 4 should be copied to index 2 if (tempi == originalPressureIndex) { tempi = 2; } else if (tempi < originalPressureIndex) { tempi++; } } locallyDecodedBytesRemaining -= localBytesRead; for (int j = 0, x = 0; j < pointCount; j++, x += intsPerPoint) { rawPointData[x + tempi] = packetDataSet[j]; } // Move the array elements to point to next set of compressed data for (uint u = 0; u < locallyDecodedBytesRemaining; u++) { inputBuffer[u] = inputBuffer[u + (int)localBytesRead]; } } // Now that we've read packet data, we must read button data if it is there byte[] buttonData = null; // since the button state is a simple bit value (either down or up), the button state // for a series of packets is packed into an array of bits rather than integers // For example, if there are 16 packets, and 2 buttons, then 32 bits can be used (e.g. 1 32-bit integer) if (0 != locallyDecodedBytesRemaining && buttonCount > 0) { // calculate the number of full bytes used for buttons per packet // Example: 10 buttons would require 1 full byte int fullBytesForButtonsPerPacket = buttonCount / Native.BitsPerByte; // calculate the number of bits that spill beyond the full byte boundary // Example: 10 buttons would require 2 extra bits (8 fit in a full byte) int partialBitsForButtonsPerPacket = buttonCount % Native.BitsPerByte; // Now figure out how many bytes we need to read for the button data localBytesRead = (uint)((buttonCount * pointCount + 7) / Native.BitsPerByte); if (localBytesRead > locallyDecodedBytesRemaining) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Buffer range is smaller than expected expected size")); } locallyDecodedBytesRemaining -= localBytesRead; int buttonSizeInBytes = (buttonCount + 7) / Native.BitsPerByte; buttonData = new byte[pointCount * buttonSizeInBytes]; // Create a bit reader to unpack the bits from the ISF stream into // loosely packed byte buffer (e.g. button data aligned on full byte // boundaries only) BitStreamReader bitReader = new BitStreamReader(inputBuffer, (uint)buttonCount * pointCount); // unpack the button data into each packet int byteCounter = 0; while (!bitReader.EndOfStream) { // unpack the fully bytes first for (int fullBytes = 0; fullBytes < fullBytesForButtonsPerPacket; fullBytes++) { buttonData[byteCounter++] = bitReader.ReadByte(Native.BitsPerByte); } // then unpack a single partial byte if necessary if (partialBitsForButtonsPerPacket > 0) { buttonData[byteCounter++] = bitReader.ReadByte((int)partialBitsForButtonsPerPacket); } } // if the number of bytes allocated != necessary byte amount then an error occurred if (byteCounter != buttonData.Length) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Button data length not equal to expected length")); } // // set the point data in the raw array // FillButtonData((int)pointCount, buttonCount, valueIntsPerPoint, //gives the first button index rawPointData, buttonData); } stylusPoints = new StylusPointCollection(stylusPointDescription /*//修复构建的代码, rawPointData, null, transform*/); // if we read too far into the stream (e.g. the packets were compressed) // then move the stream pointer back to the end of the actual packet // data before returning. This keeps the return value on the function // (representing bytes read) honest and consistent with the stream // position movement in this function. if (0 != locallyDecodedBytesRemaining) { inputStream.Seek(0 - (long)locallyDecodedBytesRemaining, SeekOrigin.Current); } return(totalBytesInStrokeBlockOfIsfStream - locallyDecodedBytesRemaining); }
/// <summary> /// Loads drawing attributes from a memory buffer. /// </summary> /// <param name="stream">Memory buffer to read from</param> /// <param name="guidList">Guid tags if extended properties are used</param> /// <param name="maximumStreamSize">Maximum size of buffer to read through</param> /// <param name="da">The drawing attributes collection to decode into</param> /// <returns>Number of bytes read</returns> #else /// <summary> /// Loads drawing attributes from a memory buffer. /// </summary> /// <param name="stream">Memory buffer to read from</param> /// <param name="guidList">Guid tags if extended properties are used</param> /// <param name="maximumStreamSize">Maximum size of buffer to read through</param> /// <param name="da">The drawing attributes collection to decode into</param> /// <returns>Number of bytes read</returns> #endif internal static uint DecodeAsISF(Stream stream, GuidList guidList, uint maximumStreamSize, DrawingAttributes da) { PenTip penTip = PenTip.Default; PenStyle penStyle = PenStyle.Default; double stylusWidth = DrawingAttributeSerializer.V1PenWidthWhenWidthIsMissing; double stylusHeight = DrawingAttributeSerializer.V1PenHeightWhenHeightIsMissing; uint rasterOperation = DrawingAttributeSerializer.RasterOperationDefaultV1; int transparency = DrawingAttributeSerializer.TransparencyDefaultV1; bool widthIsSetInISF = false; //did we find KnownIds.Width? bool heightIsSetInISF = false; //did we find KnownIds.Height? uint cbTotal = maximumStreamSize; while (maximumStreamSize > 0) { KnownTagCache.KnownTagIndex tag; uint uiTag; // First read the tag uint cb = SerializationHelper.Decode(stream, out uiTag); tag = (KnownTagCache.KnownTagIndex)uiTag; if (maximumStreamSize < cb) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("ISF size is larger than maximum stream size")); } maximumStreamSize -= cb; // Get the guid based on the tag Guid guid = guidList.FindGuid(tag); if (guid == Guid.Empty) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Drawing Attribute tag embedded in ISF stream does not match guid table")); } uint dw = 0; if (KnownIds.PenTip == guid) { cb = SerializationHelper.Decode(stream, out dw); penTip = (PenTip)dw; if (!PenTipHelper.IsDefined(penTip)) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid PenTip value found in ISF stream")); } maximumStreamSize -= cb; } else if (KnownIds.PenStyle == guid) { cb = SerializationHelper.Decode(stream, out dw); penStyle = (PenStyle)dw; maximumStreamSize -= cb; } else if (KnownIds.DrawingFlags == guid) { // Encode the drawing flags with considerations for v2 model cb = SerializationHelper.Decode(stream, out dw); DrawingFlags flags = (DrawingFlags)dw; da.DrawingFlags = flags; maximumStreamSize -= cb; } else if (KnownIds.RasterOperation == guid) { uint ropSize = GuidList.GetDataSizeIfKnownGuid(KnownIds.RasterOperation); if (ropSize == 0) { throw new InvalidOperationException(StrokeCollectionSerializer.ISFDebugMessage("ROP data size was not found")); } byte[] data = new byte[ropSize]; stream.Read(data, 0, (int)ropSize); if (data != null && data.Length > 0) { //data[0] holds the allowable values of 0-255 rasterOperation = Convert.ToUInt32(data[0]); } maximumStreamSize -= ropSize; } else if (KnownIds.CurveFittingError == guid) { cb = SerializationHelper.Decode(stream, out dw); da.FittingError = (int)dw; maximumStreamSize -= cb; } else if (KnownIds.StylusHeight == guid || KnownIds.StylusWidth == guid) { double _size; cb = SerializationHelper.Decode(stream, out dw); _size = (double)dw; maximumStreamSize -= cb; if (maximumStreamSize > 0) { cb = SerializationHelper.Decode(stream, out dw); maximumStreamSize -= cb; if (KnownTagCache.KnownTagIndex.Mantissa == (KnownTagCache.KnownTagIndex)dw) { uint cbInSize; // First thing that is in there is maximumStreamSize of the data cb = SerializationHelper.Decode(stream, out cbInSize); maximumStreamSize -= cb; // in maximumStreamSize is one more than the decoded no cbInSize++; if (cbInSize > maximumStreamSize) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("ISF size if greater then maximum stream size")); } byte[] in_data = new byte[cbInSize]; uint bytesRead = (uint)stream.Read(in_data, 0, (int)cbInSize); if (cbInSize != bytesRead) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Read different size from stream then expected")); } byte[] out_buffer = Compressor.DecompressPropertyData(in_data); using (MemoryStream localStream = new MemoryStream(out_buffer)) using (BinaryReader rdr = new BinaryReader(localStream)) { short sFraction = rdr.ReadInt16(); _size += (double)(sFraction / DrawingAttributes.StylusPrecision); maximumStreamSize -= cbInSize; } } else { // Seek it back by cb stream.Seek(-cb, SeekOrigin.Current); maximumStreamSize += cb; } } if (KnownIds.StylusWidth == guid) { widthIsSetInISF = true; stylusWidth = _size; } else { heightIsSetInISF = true; stylusHeight = _size; } } else if (KnownIds.Transparency == guid) { cb = SerializationHelper.Decode(stream, out dw); transparency = (int)dw; maximumStreamSize -= cb; } else if (KnownIds.Color == guid) { cb = SerializationHelper.Decode(stream, out dw); Color color = Color.FromRgb((byte)(dw & 0xff), (byte)((dw & 0xff00) >> Native.BitsPerByte), (byte)((dw & 0xff0000) >> (Native.BitsPerByte * 2))); da.Color = color; maximumStreamSize -= cb; } else if (KnownIds.StylusTipTransform == guid) { try { object data; cb = ExtendedPropertySerializer.DecodeAsISF(stream, maximumStreamSize, guidList, tag, ref guid, out data); Matrix matrix = Matrix.Parse((string)data); da.StylusTipTransform = matrix; } catch (InvalidOperationException) // Matrix.Parse failed. { System.Diagnostics.Debug.Assert(false, "Corrupt Matrix in the ExtendedPropertyCollection!"); } finally { maximumStreamSize -= cb; } } else { object data; cb = ExtendedPropertySerializer.DecodeAsISF(stream, maximumStreamSize, guidList, tag, ref guid, out data); maximumStreamSize -= cb; da.AddPropertyData(guid, data); } } if (0 != maximumStreamSize) { throw new ArgumentException(); } // // time to create our drawing attributes. // // 1) First we need to evaluate PenTip / StylusTip // Here is the V1 - V2 mapping // // PenTip.Circle == StylusTip.Ellipse // PenTip.Rectangle == StylusTip.Rectangle // PenTip.Rectangle == StylusTip.Diamond if (penTip == PenTip.Default) { //Since StylusTip is stored in the EPC at this point (if set), we can compare against it here. if (da.StylusTip != StylusTip.Ellipse) { // // StylusTip was set to something other than Ellipse // when we last serialized (or else StylusTip would be Ellipse, the default) // when StylusTip is != Ellipse and we serialize, we set PenTip to Rectangle // which is not the default. Therefore, if PenTip is back to Circle, // that means someone set it in V1 and we should respect that by // changing StylusTip back to Ellipse // da.StylusTip = StylusTip.Ellipse; } //else da.StylusTip is already set } else { System.Diagnostics.Debug.Assert(penTip == PenTip.Rectangle); if (da.StylusTip == StylusTip.Ellipse) { // // PenTip is Rectangle and StylusTip was either not set // before or was set to Ellipse and PenTip was changed // in a V1 ink object. Either way, we need to change StylusTip to Rectangle da.StylusTip = StylusTip.Rectangle; } //else da.StylusTip is already set } // // 2) next we need to set hight and width // if (da.StylusTip == StylusTip.Ellipse && widthIsSetInISF && !heightIsSetInISF) { // // special case: V1 PenTip of Circle only used Width to compute the circle size // and so it only serializes Width of 53 // but since our default is Ellipse, if Height is unset and we use the default // height of 30, then your ink that looked like 53,53 in V1 will look // like 30,53 here. // // stylusHeight = stylusWidth; da.HeightChangedForCompatabity = true; } // need to convert width/height into Avalon, since they are stored in HIMETRIC in ISF stylusHeight *= StrokeCollectionSerializer.HimetricToAvalonMultiplier; stylusWidth *= StrokeCollectionSerializer.HimetricToAvalonMultiplier; // Map 0.0 width to DrawingAttributes.DefaultXXXXXX (V1 53 equivalent) double height = DoubleUtil.IsZero(stylusHeight) ? (Double)DrawingAttributes.GetDefaultDrawingAttributeValue(KnownIds.StylusHeight) : stylusHeight; double width = DoubleUtil.IsZero(stylusWidth) ? (Double)DrawingAttributes.GetDefaultDrawingAttributeValue(KnownIds.StylusWidth) : stylusWidth; da.Height = GetCappedHeightOrWidth(height); da.Width = GetCappedHeightOrWidth(width); // // 3) next we need to set IsHighlighter (by looking for RasterOperation.MaskPen) // // // always store raster op // da.RasterOperation = rasterOperation; if (rasterOperation == DrawingAttributeSerializer.RasterOperationDefaultV1) { // // if rasterop is default, make sure IsHighlighter isn't in the EPC // if (da.ContainsPropertyData(KnownIds.IsHighlighter)) { da.RemovePropertyData(KnownIds.IsHighlighter); } } else { if (rasterOperation == DrawingAttributeSerializer.RasterOperationMaskPen) { da.IsHighlighter = true; } } //else, IsHighlighter will be set to false by default, no need to set it // // 4) see if there is a transparency we need to add to color // if (transparency > DrawingAttributeSerializer.TransparencyDefaultV1) { //note: Color.A is set to 255 by default, which means fully opaque //transparency is just the opposite - 0 means fully opaque so //we need to flip the values int alpha = MathHelper.AbsNoThrow(transparency - 255); Color color = da.Color; color.A = Convert.ToByte(alpha); da.Color = color; } return(cbTotal); }
/// <summary> /// This functions loads a stroke from a memory stream based on the descriptor and GuidList. It returns /// the no of bytes it has read from the stream to correctly load the stream, which should be same as /// the value of the size parameter. If they are unequal throws ArgumentException. Stroke descriptor is /// used to load the packetproperty as well as ExtendedPropertyCollection on this stroke. Compressor is used /// to decompress the data. /// </summary> /// <param name="compressor"></param> /// <param name="stream"></param> /// <param name="totalBytesInStrokeBlockOfIsfStream"></param> /// <param name="guidList"></param> /// <param name="strokeDescriptor"></param> /// <param name="stylusPointDescription"></param> /// <param name="transform"></param> /// <param name="stylusPoints"></param> /// <param name="extendedProperties"></param> /// <returns></returns> #else /// <summary> /// This functions loads a stroke from a memory stream based on the descriptor and GuidList. It returns /// the no of bytes it has read from the stream to correctly load the stream, which should be same as /// the value of the size parameter. If they are unequal throws ArgumentException. Stroke descriptor is /// used to load the packetproperty as well as ExtendedPropertyCollection on this stroke. Compressor is used /// to decompress the data. /// </summary> /// <param name="stream"></param> /// <param name="totalBytesInStrokeBlockOfIsfStream"></param> /// <param name="guidList"></param> /// <param name="strokeDescriptor"></param> /// <param name="stylusPointDescription"></param> /// <param name="transform"></param> /// <param name="stylusPoints"></param> /// <param name="extendedProperties"></param> #endif static uint DecodeISFIntoStroke( #if OLD_ISF Compressor compressor, #endif Stream stream, uint totalBytesInStrokeBlockOfIsfStream, GuidList guidList, StrokeDescriptor strokeDescriptor, StylusPointDescription stylusPointDescription, Matrix transform, out StylusPointCollection stylusPoints, out ExtendedPropertyCollection extendedProperties) { stylusPoints = null; extendedProperties = null; // We do allow a stroke with no packet data if (0 == totalBytesInStrokeBlockOfIsfStream) { return(0); } uint locallyDecodedBytes; uint remainingBytesInStrokeBlock = totalBytesInStrokeBlockOfIsfStream; // First try to load any packet data locallyDecodedBytes = LoadPackets(stream, remainingBytesInStrokeBlock, #if OLD_ISF compressor, #endif stylusPointDescription, transform, out stylusPoints); if (locallyDecodedBytes > remainingBytesInStrokeBlock) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Packet buffer overflowed the ISF stream")); } remainingBytesInStrokeBlock -= locallyDecodedBytes; if (0 == remainingBytesInStrokeBlock) { return(locallyDecodedBytes); } // Now read the extended propertes for (int iTag = 1; iTag < strokeDescriptor.Template.Count && remainingBytesInStrokeBlock > 0; iTag++) { KnownTagCache.KnownTagIndex tag = strokeDescriptor.Template[iTag - 1]; switch (tag) { case MS.Internal.Ink.InkSerializedFormat.KnownTagCache.KnownTagIndex.StrokePropertyList: { // we've found the stroke extended properties. Load them now. while (iTag < strokeDescriptor.Template.Count && remainingBytesInStrokeBlock > 0) { tag = strokeDescriptor.Template[iTag]; object data; Guid guid = guidList.FindGuid(tag); if (guid == Guid.Empty) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Stroke Custom Attribute tag embedded in ISF stream does not match guid table")); } // load the extended property data from the stream (and decode the type) locallyDecodedBytes = ExtendedPropertySerializer.DecodeAsISF(stream, remainingBytesInStrokeBlock, guidList, tag, ref guid, out data); // add the guid/data pair into the property collection (don't redecode the type) if (extendedProperties == null) { extendedProperties = new ExtendedPropertyCollection(); } extendedProperties[guid] = data; if (locallyDecodedBytes > remainingBytesInStrokeBlock) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } remainingBytesInStrokeBlock -= locallyDecodedBytes; iTag++; } } break; case MS.Internal.Ink.InkSerializedFormat.KnownTagCache.KnownTagIndex.Buttons: { // Next tag is count of buttons and the tags for the button guids iTag += (int)((uint)strokeDescriptor.Template[iTag]) + 1; } break; // ignore any tags embedded in the Stroke block that this // version of the ISF decoder doesn't understand default: { System.Diagnostics.Trace.WriteLine("Ignoring unhandled stroke tag in ISF stroke descriptor"); } break; } } // Now try to load any tagged property data or point property data while (remainingBytesInStrokeBlock > 0) { // Read the tag first KnownTagCache.KnownTagIndex tag; uint uiTag; locallyDecodedBytes = SerializationHelper.Decode(stream, out uiTag); tag = (KnownTagCache.KnownTagIndex)uiTag; if (locallyDecodedBytes > remainingBytesInStrokeBlock) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } remainingBytesInStrokeBlock -= locallyDecodedBytes; // if it is a point property block switch (tag) { case MS.Internal.Ink.InkSerializedFormat.KnownTagCache.KnownTagIndex.PointProperty: { // First load the totalBytesInStrokeBlockOfIsfStream of the point property block uint cbsize; locallyDecodedBytes = SerializationHelper.Decode(stream, out cbsize); if (locallyDecodedBytes > remainingBytesInStrokeBlock) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } remainingBytesInStrokeBlock -= locallyDecodedBytes; while (remainingBytesInStrokeBlock > 0) { // First read the tag corresponding to the property locallyDecodedBytes = SerializationHelper.Decode(stream, out uiTag); tag = (KnownTagCache.KnownTagIndex)uiTag; if (locallyDecodedBytes > remainingBytesInStrokeBlock) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } remainingBytesInStrokeBlock -= locallyDecodedBytes; // Now read the packet index for which the property will apply uint propindex; locallyDecodedBytes = SerializationHelper.Decode(stream, out propindex); if (locallyDecodedBytes > remainingBytesInStrokeBlock) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } remainingBytesInStrokeBlock -= locallyDecodedBytes; uint propsize; locallyDecodedBytes = SerializationHelper.Decode(stream, out propsize); if (locallyDecodedBytes > remainingBytesInStrokeBlock) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } remainingBytesInStrokeBlock -= locallyDecodedBytes; // Compressed data totalBytesInStrokeBlockOfIsfStream propsize += 1; // Make sure we have enough data to read if (propsize > remainingBytesInStrokeBlock) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } byte[] in_buffer = new byte[propsize]; uint bytesRead = StrokeCollectionSerializer.ReliableRead(stream, in_buffer, propsize); if (propsize != bytesRead) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Read different size from stream then expected")); } byte[] out_buffer = Compressor.DecompressPropertyData(in_buffer); System.Diagnostics.Debug.Assert(false, "ExtendedProperties for points are not supported"); // skip the bytes in both success & failure cases // Note: Point ExtendedProperties are discarded remainingBytesInStrokeBlock -= propsize; } } break; default: { object data; Guid guid = guidList.FindGuid(tag); if (guid == Guid.Empty) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Stroke Custom Attribute tag embedded in ISF stream does not match guid table")); } // load the extended property data from the stream (and decode the type) locallyDecodedBytes = ExtendedPropertySerializer.DecodeAsISF(stream, remainingBytesInStrokeBlock, guidList, tag, ref guid, out data); // add the guid/data pair into the property collection (don't redecode the type) if (extendedProperties == null) { extendedProperties = new ExtendedPropertyCollection(); } extendedProperties[guid] = data; if (locallyDecodedBytes > remainingBytesInStrokeBlock) { throw new InvalidOperationException(StrokeCollectionSerializer.ISFDebugMessage("ExtendedProperty decoded totalBytesInStrokeBlockOfIsfStream exceeded ISF stream totalBytesInStrokeBlockOfIsfStream")); } remainingBytesInStrokeBlock -= locallyDecodedBytes; } break; } } if (0 != remainingBytesInStrokeBlock) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Invalid ISF data")); } return(totalBytesInStrokeBlockOfIsfStream); }
/// <summary> /// Loads a single ExtendedProperty from the stream and add that to the list. Tag may be passed as in /// the case of Stroke ExtendedPropertyCollection where tag is stored in the stroke descriptor or 0 when tag /// is embeded in the stream /// </summary> /// <param name="stream">Memory buffer to load from</param> /// <param name="cbSize">Maximum length of buffer to read</param> /// <param name="guidList">Guid cache to read from</param> /// <param name="tag">Guid tag to lookup</param> /// <param name="guid">Guid of property</param> /// <param name="data">Data of property</param> /// <returns>Length of buffer read</returns> #endif internal static uint DecodeAsISF(Stream stream, uint cbSize, GuidList guidList, KnownTagCache.KnownTagIndex tag, ref Guid guid, out object data) { uint cb, cbRead = 0; uint cbTotal = cbSize; if (0 == cbSize) { throw new InvalidOperationException(SR.Get(SRID.EmptyDataToLoad)); } if (0 == tag) // no tag is passed, it must be embedded in the data { uint uiTag; cb = SerializationHelper.Decode(stream, out uiTag); tag = (KnownTagCache.KnownTagIndex)uiTag; if (cb > cbTotal) { throw new ArgumentException(SR.Get(SRID.InvalidSizeSpecified), "cbSize"); } cbTotal -= cb; cbRead += cb; System.Diagnostics.Debug.Assert(guid == Guid.Empty); guid = guidList.FindGuid(tag); } if (guid == Guid.Empty) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Custom Attribute tag embedded in ISF stream does not match guid table"), "tag"); } // Try and find the size uint size = GuidList.GetDataSizeIfKnownGuid(guid); if (size > cbTotal) { throw new ArgumentException(SR.Get(SRID.InvalidSizeSpecified), "cbSize"); } // if the size is 0 if (0 == size) { // Size must be embedded in the stream. Find out the compressed data size cb = SerializationHelper.Decode(stream, out size); uint cbInsize = size + 1; cbRead += cb; cbTotal -= cb; if (cbInsize > cbTotal) { throw new ArgumentException(); } byte[] bytes = new byte[cbInsize]; uint bytesRead = (uint)stream.Read(bytes, 0, (int)cbInsize); if (cbInsize != bytesRead) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Read different size from stream then expected"), "cbSize"); } cbRead += cbInsize; cbTotal -= cbInsize; //Find out the Decompressed buffer size using (MemoryStream decompressedStream = new MemoryStream(Compressor.DecompressPropertyData(bytes))) { // Add the property data = ExtendedPropertySerializer.DecodeAttribute(guid, decompressedStream); } } else { // For known size data, we just read the data directly from the stream byte[] bytes = new byte[size]; uint bytesRead = (uint)stream.Read(bytes, 0, (int)size); if (size != bytesRead) { throw new ArgumentException(StrokeCollectionSerializer.ISFDebugMessage("Read different size from stream then expected"), "cbSize"); } using (MemoryStream subStream = new MemoryStream(bytes)) { data = ExtendedPropertySerializer.DecodeAttribute(guid, subStream); } cbTotal -= size; cbRead += size; } return(cbRead); }