//--------------------------------------------------------------------------------------------------
public string ReadString()
{
Debug.Assert(DxfUtils.GetTypeForGroupCode(_GroupCode) == DxfUtils.Types.String);
string value = null;
if (_IsBinary)
{
var list = new List <byte>();
int readByte = _Stream.ReadByte();
while (readByte > 0)
{
list.Add((byte)readByte);
readByte = _Stream.ReadByte();
}
value = _Encoding.GetString(list.ToArray());
}
else
{
if (!_Reader.EndOfStream)
{
value = _Reader.ReadLine()?.Trim();
}
}
_ReadGroupCode();
return(value);
}
//--------------------------------------------------------------------------------------------------
public double ReadDouble()
{
Debug.Assert(DxfUtils.GetTypeForGroupCode(_GroupCode) == DxfUtils.Types.Double);
double value = 0.0;
if (_IsBinary)
{
var buffer = new byte[DxfUtils.GetBinarySize(DxfUtils.Types.Double)];
if (_Stream.Read(buffer, 0, buffer.Length) != buffer.Length)
{
Messages.Error($"Binary DXF is invalid/not complete.");
_GroupCode = -1;
}
else
{
value = BitConverter.ToDouble(buffer, 0);
}
}
else
{
if (!_Reader.EndOfStream)
{
var s = _Reader.ReadLine()?.Trim();
if (!s.IsNullOrEmpty())
{
double.TryParse(s, NumberStyles.Float, CultureInfo.InvariantCulture, out value);
}
}
}
_ReadGroupCode();
return(value);
}
//--------------------------------------------------------------------------------------------------
public void Skip()
{
if (_IsBinary)
{
var type = DxfUtils.GetTypeForGroupCode(_GroupCode);
switch (type)
{
case DxfUtils.Types.String:
{
int readByte;
do
{
readByte = _Stream.ReadByte();
} while (readByte > 0);
break;
}
case DxfUtils.Types.ByteChunk:
{
int readByte = _Stream.ReadByte();
if (readByte == -1)
{
Messages.Error($"Binary DXF is invalid/not complete.");
_GroupCode = -1;
return;
}
_Stream.Seek(readByte, SeekOrigin.Current);
break;
}
default:
{
int typeSize = DxfUtils.GetBinarySize(type);
if (typeSize == 0)
{
Messages.Error($"Binary DXF has group code {_GroupCode} of unknown type, the file cannot correctly parsed, in line {_Line}");
_GroupCode = -1;
return;
}
_Stream.Seek(typeSize, SeekOrigin.Current);
break;
}
}
}
else
{
if (_Reader.EndOfStream)
{
return;
}
_Reader.ReadLine();
}
_ReadGroupCode();
}
//--------------------------------------------------------------------------------------------------
public void _WriteBinary(int groupcode, object value)
{
if (groupcode <= 255)
{
_Stream.WriteByte((byte)groupcode);
}
else
{
_Stream.WriteByte(255);
_Stream.WriteByte((byte)(groupcode & 0xff));
_Stream.WriteByte((byte)((groupcode >> 8) & 0xff));
}
var type = DxfUtils.GetTypeForGroupCode(groupcode);
Debug.Assert(type != DxfUtils.Types.Unknown);
switch (value)
{
case string stringValue:
Debug.Assert(type == DxfUtils.Types.String);
var stringBytes = _Encoding.GetBytes(stringValue);
_Stream.Write(stringBytes, 0, stringBytes.Length);
_Stream.WriteByte(0);
break;
case int intValue:
Debug.Assert(type == DxfUtils.Types.Int16 || type == DxfUtils.Types.Int32);
_Stream.WriteByte((byte)(intValue & 0xff));
_Stream.WriteByte((byte)((intValue >> 8) & 0xff));
if (type == DxfUtils.Types.Int32)
{
_Stream.WriteByte((byte)((intValue >> 16) & 0xff));
_Stream.WriteByte((byte)((intValue >> 24) & 0xff));
}
break;
case double doubleValue:
Debug.Assert(type == DxfUtils.Types.Double);
var doubleBytes = BitConverter.GetBytes(doubleValue);
_Stream.Write(doubleBytes, 0, doubleBytes.Length);
break;
default:
Messages.Error($"DxfWriter: Unknown value type {value.GetType().Name} for code {groupcode}.");
break;
}
}
