public static FrameSectionPackage Deserialize(byte[] buffer, int startIndex) { FrameSectionPackage package = new FrameSectionPackage(); //Header package.FrameSequenceIndex = BitConverter.ToInt32(buffer, startIndex); package.Index = BitConverter.ToInt32(buffer, startIndex + 4); int numberOfPixelInstructions = BitConverter.ToInt32(buffer, startIndex + 8); //Content package.pixelInstructions = new List <PixelInstruction>(numberOfPixelInstructions); int pixelInstructionsStartIndex = startIndex + 12; for (int i = 0; i < numberOfPixelInstructions; i++) { package.pixelInstructions.Add(PixelInstructionProtocol.Deserialize(buffer, pixelInstructionsStartIndex + i * PixelInstructionProtocol.BYTES_NEEDED)); } if (package.pixelInstructions.Count != numberOfPixelInstructions) { throw new System.Net.ProtocolViolationException( $"Failed to deserialize FrameSectionPackage, the number of pixelInstructions incorrect (exp. {numberOfPixelInstructions}, rec. {package.pixelInstructions.Count})"); } return(package); }
public static byte[][] SerializeFrame(FrameWithoutDelta frame, int maxSizePerPackage) { int bytesNeeded = HEADER_BYTES_NEEDED + frame.Items.Length * PixelInstructionProtocol.BYTES_NEEDED; byte[][] packages; if (bytesNeeded <= maxSizePerPackage) { // The frame is small enough to fit in a single packet. // No FrameSectionPackage is needed. packages = new byte[1][]; packages[0] = new byte[bytesNeeded]; BitConverter.GetBytes(frame.Index).CopyTo(packages[0], 0); // Sequence index BitConverter.GetBytes(frame.TimeStampRelative).CopyTo(packages[0], 4); // TimeStamp (relative) BitConverter.GetBytes(frame.Count).CopyTo(packages[0], 8); // Number of PixelInstructions BitConverter.GetBytes(false).CopyTo(packages[0], 12); // Has FrameSections for (int i = 0; i < frame.Count; i++) { int bufferStartIndex = HEADER_BYTES_NEEDED + i * PixelInstructionProtocol.BYTES_NEEDED; PixelInstructionProtocol.Serialize(frame[i], packages[0], bufferStartIndex); } return(packages); } // This frame is too big to send as one packet. // Create multiple packages with the help of FrameSectionPackage // First, calculate the inital package int headerBytesNeeded = HEADER_BYTES_NEEDED + FrameSectionProtocol.HEADER_BYTES_NEEDED; int instructionsInFirstSection = (maxSizePerPackage - headerBytesNeeded) / PixelInstructionProtocol.BYTES_NEEDED; // Second, calculate how many FrameSections are needed int instructionsThatFitInOtherSections = (maxSizePerPackage - FrameSectionProtocol.HEADER_BYTES_NEEDED) / PixelInstructionProtocol.BYTES_NEEDED; int frameSectionsNeeded = (int)Math.Ceiling((double)(frame.Count - instructionsInFirstSection) / instructionsThatFitInOtherSections) + 1; // +1 for the first section packages = new byte[frameSectionsNeeded][]; // Third, create the Frame header and its first section packages[0] = new byte[headerBytesNeeded + instructionsInFirstSection * PixelInstructionProtocol.BYTES_NEEDED]; BitConverter.GetBytes(frame.Index).CopyTo(packages[0], 0); // Sequence index BitConverter.GetBytes(frame.TimeStampRelative).CopyTo(packages[0], 4); // TimeStamp (relative) BitConverter.GetBytes(frameSectionsNeeded).CopyTo(packages[0], 8); // Number of FrameSets BitConverter.GetBytes(true).CopyTo(packages[0], 12); // Has FrameSections CreateFrameSection(packages[0], 13, frame, frame.Index, 0, 0, instructionsInFirstSection); // Lastely, create the other frame sections. A new byte array (package) for each FrameSection. for (int i = 0; i < frameSectionsNeeded - 1; i++) { int instructionStartIndex = instructionsInFirstSection + i * instructionsThatFitInOtherSections; int instructionsInThisSection = Math.Min(instructionsThatFitInOtherSections, frame.Count - instructionStartIndex); packages[i + 1] = new byte[FrameSectionProtocol.HEADER_BYTES_NEEDED + PixelInstructionProtocol.BYTES_NEEDED * instructionsInThisSection]; CreateFrameSection(packages[i + 1], 0, frame, frame.Index, i + 1, instructionStartIndex, instructionsInThisSection); } return(packages); }
public const int HEADER_BYTES_NEEDED = sizeof(int) + sizeof(int) + sizeof(int); // frameSequenceIndex + Index + number of pixelinstructions; public static byte[] Serialize(FrameSectionPackage package, byte[] buffer, int startIndex) { BitConverter.GetBytes(package.FrameSequenceIndex).CopyTo(buffer, startIndex); BitConverter.GetBytes(package.Index).CopyTo(buffer, startIndex + 4); BitConverter.GetBytes(package.pixelInstructions.Count).CopyTo(buffer, startIndex + 8); int pixelInstructionsStartIndex = startIndex + 12; for (int i = 0; i < package.pixelInstructions.Count; i++) { PixelInstructionProtocol.Serialize(package.pixelInstructions[i], buffer, pixelInstructionsStartIndex + i * PixelInstructionProtocol.BYTES_NEEDED); } return(buffer); }
/// <summary> /// Deserialize a package /// </summary> /// <param name="buffer"></param> /// <returns>True if the frame has been deserialized, False if not all packages have been received.</returns> public bool TryDeserialize(byte[] bytes, out FrameWithoutDelta frame) { frame = null; if (_frameSectionPackages == null) { // First package. // Read Frame header int startIndex = 0; _frameIndex = BitConverter.ToInt32(bytes, startIndex); _timeStampRelative = BitConverter.ToInt32(bytes, startIndex += 4); int itemCount = BitConverter.ToInt32(bytes, startIndex += 4); bool hasFrameSections = BitConverter.ToBoolean(bytes, startIndex += 4); startIndex += 1; if (hasFrameSections) { _frameSectionPackages = new FrameSectionPackage[itemCount]; _frameSectionsReceived = new bool[itemCount]; _frameSectionsReceived[0] = true; // The rest of the package is a FrameSection _frameSectionPackages[0] = FrameSectionProtocol.Deserialize(bytes, startIndex); return(false); } else { frame = new FrameWithoutDelta(_frameIndex, _timeStampRelative, itemCount); // The rest of the package contains PixelInstructions for (int i = 0; i < itemCount; i++) { int instructionStartIndex = startIndex + i * PixelInstructionProtocol.BYTES_NEEDED; frame[i] = PixelInstructionProtocol.Deserialize(bytes, instructionStartIndex); } return(true); } } else { // Subsequent package. Always starts with a FrameSection. FrameSectionPackage package = FrameSectionProtocol.Deserialize(bytes, 0); if (package.FrameSequenceIndex != _frameIndex) { throw new System.Net.ProtocolViolationException( $"The frameIndex of the frameSection does not match with the Frame's index. Expected :{_frameIndex}, Received: {package.FrameSequenceIndex}"); } _frameSectionPackages[package.Index] = package; _frameSectionsReceived[package.Index] = true; if (_frameSectionsReceived.All(x => x)) { // TODO add totalNumberOfPixelInstructions to frame header int totalPixelInstructions = _frameSectionPackages.Sum(x => x.NumberOfPixelInstructions); frame = new FrameWithoutDelta(_frameIndex, _timeStampRelative, totalPixelInstructions); int index = 0; for (int i = 0; i < _frameSectionPackages.Length; i++) { for (int j = 0; j < _frameSectionPackages[i].NumberOfPixelInstructions; j++) { frame[index++] = _frameSectionPackages[i].pixelInstructions[j]; } } return(true); } return(false); } }