Re: [pdf-devel] About the filters' interface

[Jose E. Marchesi]

Hi.
    
    In the filters' interface there seems to be the possibility that not
    enough input to do the decoding is sent (an incomplete buffer). Is
    it so? In case it's affirmative: when more data comes in, will it
    come in a new assigned buffer or in an expansion of the same one?

When the apply function empties the input buffer, it must return
PDF_STM_FILTER_APPLY_STATUS_NO_INPUT to request being called again with
more input in the input buffer.  The input buffer is assumed to be empty
at that point (if some of the data in input could not be processed then
it is the responsibility of the filter to save it in some internal
buffer).
    
    Regarding output, the same: can I expand the buffer on my own
    instead of requesting more space?

The filter is not supposed to alter the size of the output buffer.
PDF_STM_FILTER_APPLY_STATUS_NO_OUTPUT is returned in that case.  Again,
the filter can cache some of the output in an internal buffer if it
needs to.

Hope that helped.

-- 
Jose E. Marchesi    address@hidden
GNU Project         http://www.gnu.org