Enable error and EOF check in class Fl_Image_Reader (#271)

This is part 1 and a prerequisite for the fix of issue #271.
It enables the user of this internal class (Fl_{BMP|GIF}_Image)
to test for read errors and EOF (end of file) while reading.

The method used to read data from memory got an optional third
argument 'const long datasize = -1)' to limit the size of the
memory block of data provided to the image reader. Default is -1
which means "unlimited" (backwards compatibility).

Using only two arguments (w/o size limit) is deprecated and should
only be done if the data size is not available.

0 files changed, 0 insertions, 0 deletions