On Jan 12, 2007, at 4:30 PM, Jeszenszky Peter wrote:
Hello,
I'm working on a Java application that extracts package metadata
from RPM
packages and transforms it to RDF, making RPM metadata available to
Semantic Web applications.
My question is about the RPMTAG_HEADERI18NTABLE header tag. The
value of
this tag is a string array that has only one element ("C") in each RPM
package that I have seen. Is this I18N feature really supported in
RPM-
aware software? May I assume that every string in the header is
encoded
in plain old US-ASCII?
RPMTAG_HEADERI81NTABLE stores the keys (i.e. locales) for an
associative array of strings.
No RedHat package since RHL 6.2 has used the mechanism. What is done
instead
is to use a 2 level lookup of msgid's and msgstr's using dcgettext().
There are still
distros that use locale's however, PLD being the first that comes to
mind.
There are only 3 tags that ever used the associative array lookup:
RPMTAG_SUMMARY
RPMTAG_DESCRIPTION
RPMTAG_GROUP
Meanwhile the much harder problem to solve is that strings in *.rpm
metadata have no well defined encoding. One cannot assume US-ASCII,
not UTF-8, nor LATIN1, nor anything else. Only '\0' terminated may be
assumed.
In practice, the vast majority of the strings are US-ASCII however.
73 de Jeff
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