RFR: 8240725: Some functions might not work with CJK character

[Yasumasa Suenaga]

Hi all,

Please review this change:

   JBS: https://bugs.openjdk.java.net/browse/JDK-8240725
   webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8240725/webrev.00/

We found the issue that HotSpot does not start when it is deployed on the path which contains CJK character(s), and it has been fixed in JDK-8240197.

On the review of JDK-8240197 [1], we concern similar issue might occur in other place, and I found potentially problem in below:

- ZFILE_Open() @ zip_util.c
- JDK_Canonicalize() @ canonicalize_md.c (for Windows)
- create_unc_path() @ java_md.c (for Windows)
- Platform::MultibyteStringToWideString() @ WindowsPlatform.cpp

This change passed tests on submit repo (mach5-one-ysuenaga-JDK-8240725-20200309-0811-9304139).


Thanks,

Yasumasa


[1] https://mail.openjdk.java.net/pipermail/hotspot-runtime-dev/2020-March/038397.html