public Header(byte[] headerBytes)
{
if (headerBytes == null)
{
throw new ArgumentNullException("headerBytes");
}
if (headerBytes.Length != HeaderLength)
{
throw new InvalidOperationException(string.Format("headerBytes must be {0} bytes long",
HeaderLength));
}
//Position Field Value Type Order
//Byte 0 File Code 9994 Integer Big
//Byte 4 Unused 0 Integer Big
//Byte 8 Unused 0 Integer Big
//Byte 12 Unused 0 Integer Big
//Byte 16 Unused 0 Integer Big
//Byte 20 Unused 0 Integer Big
//Byte 24 File Length File Length Integer Big
//Byte 28 Version 1000 Integer Little
//Byte 32 Shape Type Shape Type Integer Little
//Byte 36 Bounding Box Xmin Double Little
//Byte 44 Bounding Box Ymin Double Little
//Byte 52 Bounding Box Xmax Double Little
//Byte 60 Bounding Box Ymax Double Little
//Byte 68* Bounding Box Zmin Double Little
//Byte 76* Bounding Box Zmax Double Little
//Byte 84* Bounding Box Mmin Double Little
//Byte 92* Bounding Box Mmax Double Little
_fileCode = EndianBitConverter.ToInt32(headerBytes, 0, ProvidedOrder.Big);
if (_fileCode != ExpectedFileCode)
{
throw new InvalidOperationException(string.Format("Header File code is {0}, expected {1}",
_fileCode,
ExpectedFileCode));
}
_version = EndianBitConverter.ToInt32(headerBytes, 28, ProvidedOrder.Little);
if (_version != ExpectedVersion)
{
throw new InvalidOperationException(string.Format("Header version is {0}, expected {1}",
_version,
ExpectedVersion));
}
_fileLength = EndianBitConverter.ToInt32(headerBytes, 24, ProvidedOrder.Big);
_shapeType = (ShapeType)EndianBitConverter.ToInt32(headerBytes, 32, ProvidedOrder.Little);
_xMin = EndianBitConverter.ToDouble(headerBytes, 36, ProvidedOrder.Little);
_yMin = EndianBitConverter.ToDouble(headerBytes, 44, ProvidedOrder.Little);
_xMax = EndianBitConverter.ToDouble(headerBytes, 52, ProvidedOrder.Little);
_yMax = EndianBitConverter.ToDouble(headerBytes, 60, ProvidedOrder.Little);
_zMin = EndianBitConverter.ToDouble(headerBytes, 68, ProvidedOrder.Little);
_zMax = EndianBitConverter.ToDouble(headerBytes, 76, ProvidedOrder.Little);
_mMin = EndianBitConverter.ToDouble(headerBytes, 84, ProvidedOrder.Little);
_mMax = EndianBitConverter.ToDouble(headerBytes, 92, ProvidedOrder.Little);
}
