I tried your suggestion and had the same results as you described Mr. Merrill.
--- ba...@mxg.com wrote: From: Barry Merrill <ba...@mxg.com> To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: TRSMAIN Date: Wed, 21 Aug 2013 19:39:31 -0500 It's an easy JCL exercise to conduct an experiment to confirm what happens: TRSMAIN/AMATERSE will read a truncated tersed file and never detect it was truncated. I copied a 105472 byte valid tersed file into a DISP=(,CATLG,CATLG),SPACE=(TRK,(1)). The original untersed to 360,480 bytes, while the truncated file untersed to only 48152, and there was no message nor warning that the input file was short. -----Original Message----- From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf Of Tony Harminc Sent: Wednesday, August 21, 2013 5:57 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: TRSMAIN On 21 August 2013 14:59, Richard Pinion <rpin...@netscape.com> wrote: > A data set is compressed using TRSMAIN on z/OS. It is transmitted, using > binary format, to a non-z/OS server. For whatever reason the compressed file > on the server is incomplete. When the compressed file is transmitted, using > binary format, back to a z/OS system, and uncompressed, will TRSMAIN know the > data set is incomplete? Depends on what you mean by incomplete. A TRSMAIN/AMATERSE compressed data stream consists of a short header, and then 12-bit units with a value from 1 to 4096, terminated by a unit of zeros. The header does not contain an overall length field. (There is also a trailer, but I'm not sure it's used for anything.) If decompression hits EOF before seeing that ending zero unit, it should complain, though I don't know how elegantly. So if your data is truncated, it can and should be detected. But if you restore your damaged data into an FB dataset, the last block may be zero padded regardless, so a silent failure seems quite possible. If your compressed stream is missing a chunk in the middle, it's possible - and with anything bigger than a very small dataset, even likely - that what remains is decodable, but after the gap it certainly won't decode into anything much like the original. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN _____________________________________________________________ Netscape. Just the Net You Need. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
