public void decodeCommandInByteArray(byte[] data)
{
byte[] allData = concatWithRemainingBuffer(data);
PostItCommandType commandType = classifyCommand(allData);
PostItCommand command = null;
switch (commandType)
{
case PostItCommandType.Add:
command = decodeAddCommand(allData);
break;
case PostItCommandType.Update:
command = decodeUpdateCommand(allData);
break;
case PostItCommandType.Delete:
command = decodeDeleteCommand(allData);
break;
}
if (command != null)
{
if (commandDecodedEventHandler != null)
{
commandDecodedEventHandler(command.CommandType, command.CommandData);
}
buffer = null;
}
else
{
buffer = allData;
}
}
PostItCommand decodeAddCommand(byte[] data)
{
string commndStr = Encoding.UTF8.GetString(data);
if (!commndStr.Contains(Encoding.UTF8.GetString(PostItCommand.ADD_PREFIX)) ||
!commndStr.Contains(Encoding.UTF8.GetString(PostItCommand.ADD_POSTFIX)))
{
return(null);
}
if (!commndStr.StartsWith(Encoding.UTF8.GetString(PostItCommand.ADD_PREFIX)))
{
return(null);
}
//start to extract part of the message;
//structure of an Add command
//<ADD> ID X Y Orientation Size DataType Data </ADD>
PostItCommand command = new PostItCommand();
command.CommandType = PostItCommandType.Add;
int index = PostItCommand.ADD_PREFIX.Length;
PostItNote note = new PostItNote();
//ID
byte[] buffer = new byte[4];
Array.Copy(data, index, buffer, 0, 4);
note.Id = Utilities.UtilitiesLib.Bytes2Int(buffer);
index += 4;
//X
Array.Copy(data, index, buffer, 0, 4);
note.CenterX = Utilities.UtilitiesLib.Bytes2Float(buffer);
index += 4;
//Y
Array.Copy(data, index, buffer, 0, 4);
note.CenterY = Utilities.UtilitiesLib.Bytes2Float(buffer);
index += 4;
//skip 4 bytes of orientation, can be used in the future
index += 4;
//get size of the content
Array.Copy(data, index, buffer, 0, 4);
int contentSize = Utilities.UtilitiesLib.Bytes2Int(buffer);
index += 4;
//get content data type
Array.Copy(data, index, buffer, 0, 4);
note.DataType = PostItCommand.GetPostItContentType(buffer);
index += 4;
//start getting content
buffer = new byte[contentSize];
Array.Copy(data, index, buffer, 0, buffer.Length);
note.ParseContentFromBytes(note.DataType, buffer);
command.CommandData = note;
return(command);
}
PostItCommand decodeUpdateCommand(byte[] data)
{
string commndStr = Encoding.UTF8.GetString(data);
if (!commndStr.Contains(Encoding.UTF8.GetString(PostItCommand.UPDATE_PREFIX)) ||
!commndStr.Contains(Encoding.UTF8.GetString(PostItCommand.UPDATE_POSTFIX)))
{
return(null);
}
if (!commndStr.StartsWith(Encoding.UTF8.GetString(PostItCommand.UPDATE_PREFIX)))
{
return(null);
}
//start to extract part of the message;
//structure of an Add command
//<UPD> ID X Y Orientation </UPD>
PostItCommand command = new PostItCommand();
command.CommandType = PostItCommandType.Update;
int index = PostItCommand.UPDATE_PREFIX.Length;
PostItNote note = new PostItNote();
//ID
byte[] buffer = new byte[4];
Array.Copy(data, index, buffer, 0, 4);
note.Id = Utilities.UtilitiesLib.Bytes2Int(buffer);
index += 4;
//X
Array.Copy(data, index, buffer, 0, 4);
note.CenterX = Utilities.UtilitiesLib.Bytes2Float(buffer);
index += 4;
//Y
Array.Copy(data, index, buffer, 0, 4);
note.CenterY = Utilities.UtilitiesLib.Bytes2Float(buffer);
//at this moment, do not read the Orientation
command.CommandData = note;
return(command);
}
PostItCommand decodeDeleteCommand(byte[] data)
{
string commndStr = Encoding.UTF8.GetString(data);
if (!commndStr.Contains(Encoding.UTF8.GetString(PostItCommand.DEL_PREFIX)) ||
!commndStr.Contains(Encoding.UTF8.GetString(PostItCommand.DEL_POSTFIX)))
{
return(null);
}
int correctMsgLength = PostItCommand.DEL_PREFIX.Length + PostItCommand.DEL_POSTFIX.Length + sizeof(Int32);
if (data.Length != correctMsgLength)
{
return(null);
}
PostItCommand command = new PostItCommand();
command.CommandType = PostItCommandType.Delete;
byte[] cmdData = new byte[sizeof(Int32)];
Array.Copy(data, PostItCommand.DEL_PREFIX.Length, cmdData, 0, cmdData.Length);
command.CommandData = Utilities.UtilitiesLib.Bytes2Int(cmdData);
return(command);
}
