/// <summary>
/// Read field descriptor from block.
/// A "property" of the image.
/// </summary>
/// <param name="IDBlock">Block containing descriptor, but NOT it's data.</param>
/// <param name="endianness">Big or little endianness defined by TIFF header.</param>
/// <param name="dataStream">Full image stream to read descriptor data from.</param>
public FieldDescriptor(byte[] IDBlock, MyBitConverter.Endianness endianness, Stream dataStream)
{
FieldTag = (FieldTags)MyBitConverter.ToInt16(IDBlock, 0, endianness);
FieldType = (FieldTypes)MyBitConverter.ToInt16(IDBlock, 2, endianness);
FieldLength = MyBitConverter.ToInt32(IDBlock, 4, endianness);
DataOffset = MyBitConverter.ToInt32(IDBlock, 8, endianness);
// Read data indicated by descriptor
long oldOffset = dataStream.Position;
dataStream.Seek(DataOffset, SeekOrigin.Begin);
Data = new byte[FieldLength];
dataStream.Read(Data, 0, FieldLength);
// Reset stream position for next descriptor
dataStream.Seek(oldOffset, SeekOrigin.Begin);
}
/// <summary>
/// Read header of JPG image.
/// </summary>
/// <param name="stream">Fully formatted JPG image.</param>
/// <returns>Length of header.</returns>
protected override long Load(Stream stream)
{
base.Load(stream);
byte[] temp = stream.ReadBytes(HeaderSize);
if (!CheckIdentifier(temp))
{
throw new FormatException("Stream is not a BMP Image");
}
DataSectionLength = BitConverter.ToInt16(temp, 4);
Identifier = BitConverter.ToString(temp, 6, 5);
Version = temp[11] + ".0" + temp[12];
ResolutionUnits = (UnitsType)temp[13];
HorizontalResolution = MyBitConverter.ToInt16(temp, 14, MyBitConverter.Endianness.BigEndian);
VerticalResolution = MyBitConverter.ToInt16(temp, 16, MyBitConverter.Endianness.BigEndian);
XThumbnailPixelCount = temp[18];
YThumbnailPixelCount = temp[19];
return(HeaderSize);
}
public LasPoint2Long(byte[] rawBytes, int startPosition = 0) : base(rawBytes, startPosition)
{
_red = (ushort)MyBitConverter.ToInt16(rawBytes, startPosition + 20);
_green = (ushort)MyBitConverter.ToInt16(rawBytes, startPosition + 22);
_blue = (ushort)MyBitConverter.ToInt16(rawBytes, startPosition + 24);
}
