This is a false assumption: "... every code point in the from CCSID translates to a unique (possibly "meaningless") code point in the to CCSID ...".
There is no guarantee that all code points in a given CCSID map to a "unique" code point in any other CCSID. Peter -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Charles Mills Sent: Tuesday, June 12, 2012 11:32 AM To: [email protected] Subject: Anyone a Unicode Services expert? -- roundtrip conversion My understanding of "roundtrip conversion" is that every code point in the from CCSID translates to a unique (possibly "meaningless") code point in the to CCSID so that if for example a customer is so foolish as to transmit, for example, an object deck from z/OS to a PC in "text" format, and then transfer it back to z/OS the same way, he will have a good object deck. I am running Kirk Wolf's excellent showtrtab with the command showtrtab -s 1027 -t 1208 -q R The results I see include the following: 3F: 1A 40: 20 41: 1A Several other EBCDIC code points also translate to ASCII sub, 0x1a. So the question is if multiple EBCDIC code points all translate to 0x1a, how the heck is this a round trip translation? (I'm not alleging a bug in showtrtab. I am getting the same results with my code and ran showtrtab as a reality check and a clearer example.) Where am I going wrong? Charles ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN This message and any attachments are intended only for the use of the addressee and may contain information that is privileged and confidential. If the reader of the message is not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any dissemination of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail and delete the message and any attachments from your system. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
