[Pidgin] #9844: Abstract Filetransfer

[Pidgin]

#9844: Abstract Filetransfer
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 Reporter:  hanzz                   |        Owner:           
     Type:  patch                   |       Status:  new      
Milestone:  Patches Needing Review  |    Component:  libpurple
  Version:  2.5.8                   |   Resolution:           
 Keywords:                          |  
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Comment(by darkrain42):

 Hanzz, how does this look? It will require changes to your transport:
   * The UI needs to allocate the buffer in `ui_ops->read`
   * `purple_xfer_ui_ready` is a little more involved
   * Uses signed types instead of unsigned types
   * For read, the transport should return 0 if nothing is available, a
 negative value on error, and should allocate the buffer itself (and free
 it if there's an error). libpurple will cancel the file transfer.

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Ticket URL: <http://developer.pidgin.im/ticket/9844#comment:13>
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