Tim:
Consider that the original PKZIP specification started out on PC-DOS and
MS-DOS in the 1980s -- life was simpler then -- everything on the PC was
ASCII, as far as file names were concerned ... and even the contents of
files were expected to be ASCII (codes 0-127) or else assumed to be a
"binary" file (e.g. com, .exe, etc.).
"CCSID" is an IBM-only concept, part of IBM's "Character Data
Representation Architecture" (CDRA).. "Coded Character Set ID" (CCSID)
does not exist on most other non-IBM platforms. See
http://en.wikipedia.org/wiki/CCSID
By the time Java emerged, in the mid-90s, Java adopted the ZIP file
format as the file format for JAR files ... and Java (at least
initially) ran mainly in an ASCII world, though by then Unicode was also
emerging.
I believe the current "standard" for ZIP files and JAR files both
specify "UTF-8" for encoding the "directory" information (file names).
Both ZIP and JAR have no notion of "CCSID" as that is an IBM-only
concept, and is not even implemented consistently on all IBM platforms.
So, to imagine that UNZIP or JAR should somehow "know" (without being
told) what CCSID to use, just does not make much sense, to me..
The IFS (other than QSYS.LIB) internally stores path names using
Unicode, CCSID 1200 (UTF-16). See this post by Bruce Vining for details:
http://archive.midrange.com/mi400/200411/msg00001.html
AFAIK, OS/400 and IBM i have the best, most deeply integrated support
for CCSIDs of any of IBM's operating systems offerings.
Since ZIP and JAR are tools from the "open systems " world (Unix, Linux,
PC-DOS, MS-DOS, Windows, etc.), I would not expect these tools to
understand or know how to deal with CCSIDs.
HTH,
Mark S. Waterbury
> On 3/2/2015 7:05 PM, Tim Brown wrote:
The problem stems from an incompatibility with archivers. The original zip
spec, on which jar was based, had no ccsid attribute for file names and
instead specified that 437 be used (which doesn't work internationally).
Since then various changes and workarounds have been put in place but
they're not always supported or interoperable. Windows compressed folders
doesn't support anything and expects the char set to be local system. Your
test was jar to jar which i would expect to work as would interop with
recent versions of 7zip and winzip.
midrange.com
