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20041214: LDM nids_inflate



Rhesa,

His email and affiliation is within the perl script you sent.

Steve Chiswell
Unidata User Support


>From: "Rhesa Freeman" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200412141716.iBEHGulI000761

>Steve,
>Can I get the contact info for Pete Pokrandt?  We do need to uncompress the 
>RADAR data for other models that we are running in addition to the Unidata 
>display packages.  Thanks again.
>
>Rhesa
>
>
>----- Original Message ----- 
>From: "Unidata Support" <address@hidden>
>To: "Rhesa Freeman" <address@hidden>
>Cc: <address@hidden>; <address@hidden>; 
><address@hidden>
>Sent: Tuesday, December 14, 2004 11:00 AM
>Subject: 20041214: LDM nids_inflate
>
>
>>
>> Rhesa,
>>
>> Sounds like your perl script has a bug, and may be running
>> in an infinite loop or running out of memory on your system.
>> I'll see if Steve Emmerson has any other suggestions about LDM crashing if
>> your system is out of resources.
>>
>> Since the script was from Pete Pokrandt, you may want to
>> consult with him on any problems he might have encountered with
>> the use of his script.
>>
>> In general, trying to uncompress nids products is going to be very
>> expensive in real time if you are receiving the full suite of
>> NIDS sites. Do you need to uncompress the products from the LDM?
>> The Unidata display packages can real the products in the zlib
>> compressed format.
>>
>> Steve Chiswell
>> Unidata User Support
>>
>>
>>>From: "Rhesa Freeman" <address@hidden>
>>>Organization: UCAR/Unidata
>>>Keywords: 200412141549.iBEFnolI021151
>>
>>>This is a multi-part message in MIME format.
>>>
>>>------=_NextPart_000_0010_01C4E1C2.3DFAAD00
>>>Content-Type: text/plain;
>>> charset="iso-8859-1"
>>>Content-Transfer-Encoding: quoted-printable
>>>
>>>We are currently running the ldm 6.1.0 and are having a problem with the =
>>>nids_inflate.pl script. =20
>>>
>>>Here is the script:
>>>
>>>#!/usr/bin/perl
>>>#
>>># Based on example code available from
>>># http://www.perldoc.com/cpan/Compress/Zlib.html#DEFLATE
>>>#
>>># Modified for Unidata IDD-NIDS use by
>>>#   Pete Pokrandt, University of Wisconsin, Nov 2000.
>>>#   address@hidden
>>>#
>>>use Compress::Zlib ;
>>>use File::Path ;
>>>$input =3D '' ;
>>>binmode STDIN;
>>>binmode STDOUT;
>>>binmode OUTFILE;
>>>
>>># Read in the whole file, 1 Mb should cover it. It'll end w/o error
>>># when it hits the end of stdin
>>>
>>>read (STDIN, $input, 1000000);
>>>close STDIN;
>>>
>>># strip off the uncompressed header. Don't need the swap  in variable
>>># but with my limited perl knowledge I didn't want to mess with the
>>># original prog much
>>>
>>>$tempin =3D substr($input,41);
>>>$input=3D$tempin;
>>>
>>># Read in the first chunk of data. This one has to have a header
>>># stripped off after decompression
>>>
>>>$x =3D inflateInit()
>>>   or die "Cannot create a inflation stream\n" ;
>>>($output, $status) =3D $x->inflate(\$input) ;
>>>if ($status < 0 or $status > 2) {
>>>die "Not a zlib compressed file";
>>>}
>>># print "Argv0 is @ARGV[0]\n";
>>># print FILEHANDLE LIST
>>># check to see if path exists, create it if not.  Ugly code alert!
>>>#  fix this later
>>>#  The length in substr (last number) must match the length of the
>>>#   path to the subdir, minus the length of the acutal file name.
>>>$where =3D substr(@ARGV[0], 0, 34);
>>># printf (STDERR "Where: $where\n");
>>>if (-d $where) {
>>>        } else {
>>>        mkpath("$where", 0, 0777);
>>>}
>>>open(OUTFILE, ">@ARGV[0]") or die "Can't open output file @ARGV[0].  =
>>>Error =3D $!\n";
>>>
>>>$stripped =3D substr($output,54);
>>>print OUTFILE $stripped;
>>>
>>>
>>># While the input string still has stuff in it - this works
>>># because the inflate function modifies input to have whatever
>>># is left in it after the first complete chunk is uncompressed
>>># (the 4000 byte section Dan mentioned)
>>>
>>>while (length($input) > 0 )
>>>{
>>># Initialize a new structure - this needs to be done for each call
>>># to inflate. die gracefully if it fails from lack of memory, whatever
>>>
>>>$x =3D inflateInit()
>>>   or die "Cannot create a inflation stream\n" ;
>>>
>>># call inflate. It returns
>>>#  $output - the decompressed stream, which will be max 4000 bytes
>>>#  $status - a return code. 0 is success,
>>>#                           1 is end of data (i.e. you didn't send
>>>#                             a complete stream, and it expected
>>>#                             more data
>>>#  $input  - contains the remainder of $input after the stream that
>>>#            got decoded into $output
>>>#
>>>
>>>($output, $status) =3D $x->inflate(\$input) ;
>>>
>>># write $output to STDOUT. each write gets appended to the previous, so
>>># you eventually build up the whole file. The first write still needs
>>># to be modified to strip off the header that is in the file after
>>># decompression
>>>
>>>print OUTFILE $output;
>>>
>>># Gracefully exit if the decode failed. This means something bad
>>># happened. This is how I discovered that I had both the compressed
>>># and encrypted data in one file. The compressed stuff worked but the
>>># encrypted didn't.
>>>
>>>if ($status < 0 or $status > 2) {
>>>print OUTFILE "\n";
>>>close OUTFILE;
>>>exit 0;
>>>#die "bogus second header";
>>>}
>>>}
>>>print OUTFILE "\n";
>>>close OUTFILE;
>>>
>>>exit 0;
>>>
>>>
>>>
>>>Here is the log file:
>>>
>>>Dec 13 18:43:43 pqact[27120]: Starting Up
>>>Dec 13 18:44:12 pqact[27120]: child 27329 exited with status 32
>>>Dec 13 18:44:35 pqact[27120]: pbuf_flush 3: time elapsed   2.666694
>>>Dec 13 18:45:44 pqact[27120]: child 28068 exited with status 32
>>>Dec 13 18:47:21 pqact[27120]: pbuf_flush 3: time elapsed   2.455863
>>>Dec 13 18:49:28 pqact[27120]: pbuf_flush 3: time elapsed   2.905513
>>>Dec 13 18:49:32 pqact[27120]: pbuf_flush 3: time elapsed   2.231726
>>>Dec 13 19:01:57 pqact[27120]: child 35710 exited with status 32
>>>Dec 13 19:08:04 pqact[27120]: child 38341 exited with status 32
>>>Dec 13 19:08:20 pqact[27120]: child 38451 exited with status 32
>>>Dec 13 19:16:45 pqact[27120]: child 41379 exited with status 32
>>>
>>>Then the ldm crashes.  Any suggestions?  Thanks.
>>>
>>>Rhesa Freeman
>>>Data Manager
>>>Regional Weather Information Center
>>>University of North Dakota
>>>
>>>
>>>
>>>------=_NextPart_000_0010_01C4E1C2.3DFAAD00
>>>Content-Type: text/html;
>>> charset="iso-8859-1"
>>>Content-Transfer-Encoding: quoted-printable
>>>
>>><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
>>><HTML><HEAD>
>>><META http-equiv=3DContent-Type content=3D"text/html; =
>>>charset=3Diso-8859-1">
>>><META content=3D"MSHTML 6.00.2900.2523" name=3DGENERATOR>
>>><STYLE></STYLE>
>>></HEAD>
>>><BODY bgColor=3D#ffffff>
>>><DIV><FONT face=3DArial size=3D2>We are currently running the ldm 6.1.0 =
>>>and are=20
>>>having a problem with the nids_inflate.pl script.&nbsp; </FONT></DIV>
>>><DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2>Here is the script:</FONT></DIV>
>>><DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2>#!/usr/bin/perl<BR>#<BR># Based on =
>>>example code=20
>>>available from<BR># <A=20
>>>href=3D"http://www.perldoc.com/cpan/Compress/Zlib.html#DEFLATE";>http://ww=
>>>w.perldoc.com/cpan/Compress/Zlib.html#DEFLATE</A><BR>#<BR>#=20
>>>Modified for Unidata IDD-NIDS use by<BR>#&nbsp;&nbsp; Pete Pokrandt, =
>>>University=20
>>>of Wisconsin, Nov 2000.<BR>#&nbsp;&nbsp; <A=20
>>>href=3D"mailto:address@hidden";>address@hidden</A><BR>#<BR>u=
>>>se=20
>>>Compress::Zlib ;<BR>use File::Path ;<BR>$input =3D '' ;<BR>binmode=20
>>>STDIN;<BR>binmode STDOUT;<BR>binmode OUTFILE;</FONT></DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2># Read in the whole file, 1 Mb should =
>>>cover it.=20
>>>It'll end w/o error<BR># when it hits the end of stdin</FONT></DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2>read (STDIN, $input, 1000000);<BR>close =
>>>
>>>STDIN;</FONT></DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2># strip off the uncompressed header. =
>>>Don't need the=20
>>>swap&nbsp; in variable<BR># but with my limited perl knowledge I didn't =
>>>want to=20
>>>mess with the<BR># original prog much</FONT></DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2>$tempin =3D=20
>>>substr($input,41);<BR>$input=3D$tempin;</FONT></DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2># Read in the first chunk of data. This =
>>>one has to=20
>>>have a header<BR># stripped off after decompression</FONT></DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2>$x =3D inflateInit()<BR>&nbsp;&nbsp; or =
>>>die "Cannot=20
>>>create a inflation stream\n" ;<BR>($output, $status) =3D =
>>>$x-&gt;inflate(\$input)=20
>>>;<BR>if ($status &lt; 0 or $status &gt; 2) {<BR>die "Not a zlib =
>>>compressed=20
>>>file";<BR>}<BR># print "Argv0 is @ARGV[0]\n";<BR># print FILEHANDLE =
>>>LIST<BR>#=20
>>>check to see if path exists, create it if not.&nbsp; Ugly code =
>>>alert!<BR>#&nbsp;=20
>>>fix this later<BR>#&nbsp; The length in substr (last number) must match =
>>>the=20
>>>length of the<BR>#&nbsp;&nbsp; path to the subdir, minus the length of =
>>>the=20
>>>acutal file name.<BR>$where =3D substr(@ARGV[0], 0, 34);<BR># printf =
>>>(STDERR=20
>>>"Where: $where\n");<BR>if (-d $where)=20
>>>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; } else=20
>>>{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mkpath("$where", 0,=20
>>>0777);<BR>}<BR>open(OUTFILE, "&gt;@ARGV[0]") or die "Can't open output =
>>>file=20
>>>@ARGV[0].&nbsp; Error =3D $!\n";</FONT></DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2>$stripped =3D =
>>>substr($output,54);<BR>print OUTFILE=20
>>>$stripped;</FONT></DIV>
>>><DIV>&nbsp;</DIV><FONT face=3DArial size=3D2>
>>><DIV><BR># While the input string still has stuff in it - this =
>>>works<BR>#=20
>>>because the inflate function modifies input to have whatever<BR># is =
>>>left in it=20
>>>after the first complete chunk is uncompressed<BR># (the 4000 byte =
>>>section Dan=20
>>>mentioned)</DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV>while (length($input) &gt; 0 )<BR>{<BR># Initialize a new structure =
>>>- this=20
>>>needs to be done for each call<BR># to inflate. die gracefully if it =
>>>fails from=20
>>>lack of memory, whatever</DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV>$x =3D inflateInit()<BR>&nbsp;&nbsp; or die "Cannot create a =
>>>inflation=20
>>>stream\n" ;</DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV># call inflate. It returns<BR>#&nbsp; $output - the decompressed =
>>>stream,=20
>>>which will be max 4000 bytes<BR>#&nbsp; $status - a return code. 0 is=20
>>>success,<BR>#&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
>>>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
>>>nbsp;&nbsp;&nbsp;&nbsp;=20
>>>1 is end of data (i.e. you didn't=20
>>>send<BR>#&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
>>>p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
>>>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
>>>a complete stream, and it=20
>>>expected<BR>#&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
>>>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
>>>nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
>>>more data<BR>#&nbsp; $input&nbsp; - contains the remainder of $input =
>>>after the=20
>>>stream=20
>>>that<BR>#&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
>>>p; got=20
>>>decoded into $output<BR>#</DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV>($output, $status) =3D $x-&gt;inflate(\$input) ;</DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV># write $output to STDOUT. each write gets appended to the =
>>>previous,=20
>>>so<BR># you eventually build up the whole file. The first write still =
>>>needs<BR>#=20
>>>to be modified to strip off the header that is in the file after<BR>#=20
>>>decompression</DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV>print OUTFILE $output;</DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV># Gracefully exit if the decode failed. This means something =
>>>bad<BR>#=20
>>>happened. This is how I discovered that I had both the compressed<BR># =
>>>and=20
>>>encrypted data in one file. The compressed stuff worked but the<BR># =
>>>encrypted=20
>>>didn't.</DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV>if ($status &lt; 0 or $status &gt; 2) {<BR>print OUTFILE =
>>>"\n";<BR>close=20
>>>OUTFILE;<BR>exit 0;<BR>#die "bogus second header";<BR>}<BR>}<BR>print =
>>>OUTFILE=20
>>>"\n";<BR>close OUTFILE;</DIV>
>>><DIV>&nbsp;</DIV>
>>><DIV>exit 0;<BR></FONT></DIV>
>>><DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2>Here is the log file:</FONT></DIV>
>>><DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2>Dec 13 18:43:43 pqact[27120]: Starting =
>>>Up<BR>Dec 13=20
>>>18:44:12 pqact[27120]: child 27329 exited with status 32<BR>Dec 13 =
>>>18:44:35=20
>>>pqact[27120]: pbuf_flush 3: time elapsed&nbsp;&nbsp; 2.666694<BR>Dec 13 =
>>>18:45:44=20
>>>pqact[27120]: child 28068 exited with status 32<BR>Dec 13 18:47:21 =
>>>pqact[27120]:=20
>>>pbuf_flush 3: time elapsed&nbsp;&nbsp; 2.455863<BR>Dec 13 18:49:28 =
>>>pqact[27120]:=20
>>>pbuf_flush 3: time elapsed&nbsp;&nbsp; 2.905513<BR>Dec 13 18:49:32 =
>>>pqact[27120]:=20
>>>pbuf_flush 3: time elapsed&nbsp;&nbsp; 2.231726<BR>Dec 13 19:01:57 =
>>>pqact[27120]:=20
>>>child 35710 exited with status 32<BR>Dec 13 19:08:04 pqact[27120]: child =
>>>38341=20
>>>exited with status 32<BR>Dec 13 19:08:20 pqact[27120]: child 38451 =
>>>exited with=20
>>>status 32<BR>Dec 13 19:16:45 pqact[27120]: child 41379 exited with =
>>>status=20
>>>32<BR></FONT></DIV>
>>><DIV><FONT face=3DArial size=3D2>Then the ldm crashes.&nbsp; Any =
>>>suggestions?&nbsp;=20
>>>Thanks.</FONT></DIV>
>>><DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2>Rhesa Freeman</FONT></DIV>
>>><DIV><FONT face=3DArial size=3D2>Data Manager</FONT></DIV>
>>><DIV><FONT face=3DArial size=3D2>Regional Weather Information =
>>>Center</FONT></DIV>
>>><DIV><FONT face=3DArial size=3D2>University of North Dakota</FONT></DIV>
>>><DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
>>><DIV><FONT face=3DArial size=3D2>&nbsp;</DIV></FONT></BODY></HTML>
>>>
>>>------=_NextPart_000_0010_01C4E1C2.3DFAAD00--
>>>
>> --
>> ****************************************************************************
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