/// <summary>
///
/// </summary>
/// <param name="bytes"></param>
/// <param name="fullFile"></param>
/// <returns></returns>
/// <remarks>
/// References:
/// http://www.ee.cooper.edu/courses/course_pages/past_courses/EE458/TIFF/
/// http://search.cpan.org/src/EXIFTOOL/Image-ExifTool-6.36/html/TagNames/Canon.html
/// http://www.burren.cx/david/canon.html
/// http://cpan.uwinnipeg.ca/htdocs/Image-ExifTool/Image/ExifTool/Canon.pm.html
/// </remarks>
public static PropertyItem[] DecodeIFD(byte[] bytes, FileStream fullFile)
{
int index = 0;
int count = (int)BitConverter.ToUInt16(bytes, index);
index += UInt16_Size;
PropertyItem[] items = new PropertyItem[count];
for (int i = 0; i < count; i++)
{
items[i] = ExifWriter.CreatePropertyItem();
// read in the ID (2 bytes)
items[i].Id = (int)BitConverter.ToUInt16(bytes, index);
index += UInt16_Size;
// read in the Type (2 bytes)
items[i].Type = (short)BitConverter.ToUInt16(bytes, index);
index += UInt16_Size;
// read in the Length (4 bytes)
items[i].Len = (int)BitConverter.ToUInt32(bytes, index);
index += UInt32_Size;
int length = GetSizeOf(items[i].Type) * items[i].Len;
if (length > 4)
{
// read in the Data as offset (4 bytes)
int offset = (int)BitConverter.ToUInt32(bytes, index);
items[i].Value = new byte[length]; //CopyBytes(bytes, offset, length);
fullFile.Position = offset;
fullFile.Read(items[i].Value, 0, length);
}
else
{
// read in the Data as byte[]
items[i].Value = CopyBytes(bytes, index, length);
}
index += UInt32_Size;
}
return(items);
}
/// <summary>
/// Adds an EXIF property to an image.
/// </summary>
/// <param name="image"></param>
/// <param name="property"></param>
public static void AddExifData(Image image, ExifProperty property)
{
if (image == null)
{
throw new ArgumentNullException("image");
}
if (property == null)
{
return;
}
PropertyItem propertyItem;
// The .NET interface for GDI+ does not allow instantiation of the
// PropertyItem class. Therefore one must be stolen off the Image
// and repurposed. GDI+ uses PropertyItem by value so there is no
// side effect when changing the values and reassigning to the image.
if (image.PropertyItems == null || image.PropertyItems.Length < 1)
{
propertyItem = ExifWriter.CreatePropertyItem();
}
else
{
propertyItem = image.PropertyItems[0];
}
propertyItem.Id = (int)property.Tag;
propertyItem.Type = (short)property.Type;
Type dataType = ExifDataTypeAttribute.GetDataType(property.Tag);
propertyItem.Value = ExifEncoder.ConvertData(dataType, property.Type, property.Value);
propertyItem.Len = propertyItem.Value.Length;
// This appears to not be necessary
ExifWriter.RemoveExifData(image, property.Tag);
image.SetPropertyItem(propertyItem);
}