[Info-vax] proper format for JPEG files

[VAXman- at SendSpamHere.ORG]

In article <4025a1b0-70aa-4ce2-99fe-ddabd3d48bbd at t7g2000vbv.googlegroups.com>, Jose Baars <peutbaars at googlemail.com> writes:
>On Jul 25, 6:35=A0pm, VAXman-  @SendSpamHere.ORG wrote:
>
>> How did you write one???
>>
>
>I didn't, that's my point.
>
>I really was looking for a 'universal' read routines that would be
>able
>to read data from all file formats available on VMS, for an SFTP
>client,
>so file attributes and other VMS specific stuff not relevant.
>
>I used fread(... really big chunk...), but fread doesn't understand
>VFC and some other files very well, and I needed access to the
>modified time, the owner and the possibility to add RAH, MBF etc.
>made using RMS a much more attractive choice.
>
>
>When reading these illegal stream_lf files with records longer
>than 32767 bytes, $GET returned with RMS$_RTB. As my buffer
>was already at max, i.e. rab$w_usz =3D 65535, I was stuck, obviously
>the records were longer than the max.

The maximum record size for RMS *IS* 32,767. 


>Oddly, when retrying this, I noticed it complains like this:
>%RMS-W-RTB, 0 byte record too large for user's buffer.
>How anything can be to small for nothing is beyond me.
>
>Of course the ugly solution was obvious: if I got RMS$_RTB, and
>the file was stream_lf and  lrl was 32767, then I spawned a
>set file/attr=3D(rfm=3Dfix,lrl=3D512).
>
>If there is a nice solution, I would be grateful to be enlightened!

Just $MODIFY the FAB to be FIXed 512.  $REWIND your file and start reading
it as FIXed.

-- 
VAXman- A Bored Certified VMS Kernel Mode Hacker    VAXman(at)TMESIS(dot)ORG

All your spirit rack abuses, come to haunt you back by day.
All your Byzantine excuses, given time, given you away.