[ANN] filelike 0.1.1

[Ryan Kelly]

Hi Everyone,


  I've just uploaded the first version of my module for building,
wrapping and transforming file-like objects: filelike-0.1.1


  More details at:  http://www.rfk.id.au/software/projects/filelike/
  At the Cheese Shop: http://cheeseshop.python.org/pypi/filelike/


  Cheers,

    Ryan



Description:
------------

The filelike module takes care of the groundwork for implementing and
handling file-like objects that implement a rich file-like interface,
including reading, writing, and iteration.  It also provides a number
of useful classes built on top of this functionality.

The main class is FileLikeBase, which implements the entire file-like
interface (currently minus seek() and tell()) on top of primitive
_read() and _write() methods.  Subclasses may implement either or
both of these methods to obtain all the higher-level file behaviors.


Two methods are provided for when code expects to deal with file-like
objects:
    
    * is_filelike(obj):   checks that an object is file-like
    * to_filelike(obj):   wraps a variety of objects in a file-like
                          interface


On top of this framework are built a collection of useful classes,
including:
    
    * TransFile:  pass file contents through an arbitrary translation
                  function (e.g. compression, encryption, ...)
                  
    * FixedBlockSizeFile:  ensure all read/write requests are aligned
                           with a given blocksize
                           
    * DecryptFile:    on-the-fly reading and writing to an encrypted 
                      file (using PEP272 cipher API)

 
As an example of the type of thing this module is designed to achieve, 
here's how to use the DecryptFile class to transparently access an 
encrypted file:
    
    # Create the decryption key
    from Crypto.Cipher import DES
    cipher = DES.new('abcdefgh',DES.MODE_ECB)
    # Open the encrypted file
    f = DecryptFile(file("some_encrypted_file.bin","r"),cipher)
    
The object in <f> now behaves as a file-like object, transparently 
decrypting the file on-the-fly as it is read.


-- 
Ryan Kelly
http://www.rfk.id.au  |  This message is digitally signed. Please visit
ryan at rfk.id.au        |  http://www.rfk.id.au/ramblings/gpg/ for details

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