[luatex] Chunks of pdfe.readfromstream()

[Andreas Matthias]

On Thu, Mar 30, 2023 at 1:54 PM luigi scarso <luigi.scarso at gmail.com> wrote:

>
>
> On Tue, 14 Mar 2023 at 20:35, Andreas Matthias <andreas.matthias at gmail.com>
> wrote:
>
>> The manual says that
>>
>>    str, n = pdfe.readfromstream(<stream>)
>>
>> reads the stream in chunks. Now I had expected that `str` is just one
>> chunk of the whole stream.
>> But it seems that `str` always contains the whole stream.
>>
>> Could someone enlighten me what "read in chunks" means?
>>
>>
> I need a short example .
>


Run texlua with this code:

  local doc = pdfe.open('test.pdf')
   local page = pdfe.getpage(doc, 1)
   local stream = page['Contents']
  pdfe.openstream(stream)
   local str, n = pdfe.readfromstream(stream)
   print(str)
   print(n)

Here test.pdf is:

   \pdfvariable compresslevel = 0
   \pdfvariable objcompresslevel = 0
   Lorem ipsum dolor sit amet
   ... a lot more text here ...
   \bye

Not matter how long the stream is, pdfe.readfromstream() always returns the
whole stream.
What's the difference to pdfe.readwholestream()?

Cheers
Andreas
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