[Clam-devel] PATCH: new File class heirarchy

[Zach Welch]

Hi all,

The attached patch refactors the re-usable portions out of the AudioFile class 
and into a new File class.  This new base class contains virtual methods that 
allowed further refactoring of the GUI configurator to use one pair of 
methods to operate on the different types of files.  These changes will help 
eliminate redundant code in the EmbeddedNetworkFile and NeuralNetworkFile 
classes that I have in my tree, as well as hypotheticals like VideoFile.

This patch also changes the semantics of AudioFile, AudioFileSource, and 
AudioFileTarget; inheriting from File, AudioFile has become an abstract base 
class and can no longer be instantiated.  Changes are included to make all 
in-tree consumers use either AudioFileSource (for reading) or AudioFileTarget 
(for writing).  These differences are all fairly minor, but they have one 
positive side-effect: they help clarify the intent of the surrounding code.

Cheers,

Zach
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