Re: [PATCH] transparent file reader

[Vladimir 'φ-coder/phcoder' Serbinenko]

Szymon Janc wrote:
> Dnia wtorek 16 luty 2010 o 19:16:19 Vladimir 'φ-coder/phcoder' Serbinenko 
> napisał(a):
>
>   
>> I like the patch however few comments:
>> 1) How are filters ordered?
>> 2) How would I selectively disable a filter. E.g. for hexdump or when
>> payload expects compressed data?
>>
>> +/* Registered filters list.  */
>> +static grub_io_filter_t grub_io_filter_list = NULL;
>> +
>> +void grub_io_register(grub_io_filter_t filter)
>> +{
>> +   filter->next = grub_io_filter_list;
>> +   grub_io_filter_list = filter;
>> +}
>> +
>>
>> list.h can be used for this.
>>     
>
> Attached is new version, changes since previous one:
> - use list.h
> - filter registration is priority based
> - filter can be disabled for next open by grub_io_filter_disable()
>
> Interface could be simpler if make it only transparent/non-transparent but 
> this is somewhat less flexible. Yet, is it really needed?
>
>   
First of all I would prefer not_easily_seekable part to be a separate
patches so it would be easier to pinpoint bugs by bisecting.

+  .prio = 1,
This should be macroifyed e.g
GRUB_IOFILTER_PRIO_COMPRESSOR

grub_io_register,  grub_io_unregister and grub_io_filter_disable must be 
inlined. Last one has to be splitted into grub_io_filter_disable and 
grub_io_filter_disable_all to avoid special case with "". va_arg in 
grub_io_filter_disable doesn't justify itself (one can always make 2 calls, 
especially if function would be inlined


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-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko

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