public override void Write(byte[] buffer, int offset, int count)
{
int num = offset + count;
for (int index = offset; index < num; ++index)
{
this.ushort_0 = Stream1.smethod_2(this.ushort_0, buffer[index]);
}
this.stream_0.Write(buffer, offset, count);
}
public override int Read(byte[] buffer, int offset, int count)
{
int num1 = this.stream_0.Read(buffer, offset, count);
int num2 = offset + count;
for (int index = offset; index < num2; ++index)
{
this.ushort_0 = Stream1.smethod_2(this.ushort_0, buffer[index]);
}
return(num1);
}
public static ushort smethod_1(ushort initialCrc, byte[] data, long offset, long length)
{
ushort crc = initialCrc;
int index = (int)offset;
while (length-- > 0L)
{
crc = Stream1.smethod_2(crc, data[index]);
++index;
}
return(crc);
}
private void method_0(long sectionStartPosition)
{
ushort num1 = (ushort)(this.memoryStream_0.Position - sectionStartPosition);
long position = this.memoryStream_0.Position;
this.memoryStream_0.Position = sectionStartPosition;
this.memoryStream_0.WriteByte((byte)((uint)num1 >> 8));
this.memoryStream_0.WriteByte((byte)((uint)num1 & (uint)byte.MaxValue));
this.memoryStream_0.Position = position;
ushort num2 = Stream1.smethod_1((ushort)49345, this.memoryStream_0.GetBuffer(), sectionStartPosition, this.memoryStream_0.Length - sectionStartPosition);
this.memoryStream_0.WriteByte((byte)((uint)num2 >> 8));
this.memoryStream_0.WriteByte((byte)((uint)num2 & (uint)byte.MaxValue));
}
public void Write()
{
this.method_0();
this.stream_0.Write(Class886.byte_0, 0, Class886.byte_0.Length);
Stream1 stream1 = new Stream1(this.stream_0, (ushort)49345);
Class1045.smethod_9((Stream)stream1, (int)this.memoryStream_0.Length);
if (this.dxfHeader_0.AcadVersion > DxfVersion.Dxf21 && this.dxfHeader_0.AcadMaintenanceVersion > 3 || this.dxfHeader_0.AcadVersion > DxfVersion.Dxf27)
{
Class1045.smethod_9((Stream)stream1, 0);
}
stream1.Write(this.memoryStream_0.GetBuffer(), 0, (int)this.memoryStream_0.Length);
Class1045.smethod_6(this.stream_0, stream1.Crc);
this.stream_0.Write(Class886.byte_1, 0, Class886.byte_1.Length);
}
private void method_12()
{
int sectionStartPosition1 = (int)Class653.smethod_0(this.int_0);
int num1 = sectionStartPosition1 + (int)this.memoryStream_0.Length;
int sectionStartPosition2 = num1 + (int)this.memoryStream_4.Length;
int sectionStartPosition3 = sectionStartPosition2 + (int)this.memoryStream_1.Length;
int sectionStartPosition4 = sectionStartPosition3 + (int)this.memoryStream_2.Length + (int)this.memoryStream_3.Length + (int)this.memoryStream_5.Length;
int sectionStartPosition5 = sectionStartPosition4 + (int)this.memoryStream_6.Length + (int)this.memoryStream_7.Length;
MemoryStream memoryStream = new MemoryStream();
Interface29 streamWriter = Class724.Create(this.dxfVersion_0, (Stream)memoryStream, Encodings.GetEncoding((int)this.dxfModel_0.Header.DrawingCodePage));
streamWriter.imethod_13(Encodings.Ascii.GetBytes(this.dxfModel_0.Header.AcadVersionString), 0, 6);
Interface29 nterface29 = streamWriter;
byte[] numArray = new byte[7];
numArray[5] = (byte)15;
numArray[6] = (byte)1;
byte[] bytes = numArray;
nterface29.imethod_12(bytes);
streamWriter.imethod_19(num1);
streamWriter.imethod_11((byte)27);
streamWriter.imethod_11((byte)25);
int num2 = (int)Class952.smethod_1(this.dxfModel_0.Header.DrawingCodePage);
streamWriter.imethod_13(LittleEndianBitConverter.GetBytes((short)num2), 0, 2);
streamWriter.imethod_13(LittleEndianBitConverter.GetBytes(this.int_0), 0, 4);
long position = this.stream_0.Position;
this.method_13(streamWriter, (byte)0, sectionStartPosition2, (int)this.memoryStream_1.Length);
this.method_13(streamWriter, (byte)1, sectionStartPosition3, (int)this.memoryStream_2.Length);
this.method_13(streamWriter, (byte)2, sectionStartPosition4, (int)this.memoryStream_6.Length);
this.method_13(streamWriter, (byte)3, 0, 0);
this.method_13(streamWriter, (byte)4, sectionStartPosition5, (int)this.memoryStream_9.Length);
this.method_13(streamWriter, (byte)5, sectionStartPosition1, (int)this.memoryStream_0.Length);
streamWriter.Flush();
ushort num3 = Stream1.smethod_1((ushort)49345, memoryStream.GetBuffer(), 0L, memoryStream.Length);
streamWriter.imethod_18((short)num3);
streamWriter.imethod_13(Class800.byte_4, 0, Class800.byte_4.Length);
this.stream_0.Write(memoryStream.GetBuffer(), 0, (int)memoryStream.Length);
}
public void Write()
{
this.method_0();
this.stream_0.Write(Class1033.byte_0, 0, Class1033.byte_0.Length);
Stream1 stream1 = new Stream1(this.stream_0, (ushort)49345);
Class1045.smethod_9((Stream)stream1, (int)this.memoryStream_0.Length);
if (this.dxfModel_0.Header.AcadVersion > DxfVersion.Dxf21 && this.dxfModel_0.Header.AcadMaintenanceVersion > 3 || this.dxfModel_0.Header.AcadVersion > DxfVersion.Dxf27)
{
Class1045.smethod_9((Stream)stream1, 0);
}
byte[] buffer = this.memoryStream_0.GetBuffer();
stream1.Write(buffer, 0, (int)this.memoryStream_0.Length);
Class1045.smethod_6(this.stream_0, stream1.Crc);
this.stream_0.Write(Class1033.byte_1, 0, Class1033.byte_1.Length);
if (this.dxfModel_0.Header.AcadVersion < DxfVersion.Dxf18)
{
return;
}
Class1045.smethod_9(this.stream_0, 0);
Class1045.smethod_9(this.stream_0, 0);
}
public void Write()
{
this.method_0();
this.stream_0.Write(Class654.byte_0, 0, Class654.byte_0.Length);
Stream1 stream1 = new Stream1(this.stream_0, (ushort)49345);
int num = 4 + (int)this.interface29_0.Stream.Length + 2 + 8;
Class1045.smethod_9((Stream)stream1, num);
stream1.Write(this.memoryStream_0.GetBuffer(), 0, (int)this.memoryStream_0.Length);
Class1045.smethod_6(this.stream_0, stream1.Crc);
if (this.dxfModel_0.Header.AcadVersion >= DxfVersion.Dxf14)
{
this.stream_0.WriteByte((byte)147);
this.stream_0.WriteByte((byte)134);
this.stream_0.WriteByte((byte)187);
this.stream_0.WriteByte((byte)0);
this.stream_0.WriteByte((byte)208);
this.stream_0.WriteByte((byte)56);
this.stream_0.WriteByte((byte)131);
this.stream_0.WriteByte((byte)87);
}
this.stream_0.Write(Class654.byte_1, 0, Class654.byte_1.Length);
}
public static ushort smethod_0(ushort initialCrc, byte[] data, long length)
{
return(Stream1.smethod_1(initialCrc, data, 0L, length));
}
