Make ExternalReferenceUriTranslator more robust against broken UTF-8

<https://lists.freedesktop.org/archives/libreoffice/2023-November/091151.html>
"CppunitTest_stoc_uriproc failed on Windows" reports that
translateToExternal("file:///abc/%feef") produces an empty string (indicating
failure) instead of "file:///abc/%FEef" (as expected in
stoc/test/uriproc/test_uriproc.cxx) when osl_getThreadTextEncoding() is Shift
JIS.

This was due to how the call to rtl::Uri::encode in
Translator::translateToExternal (in
stoc/source/uriproc/ExternalUriReferenceTranslator.cxx) behaved:  It internally
interpreted its input "%FE" as the single-byte Shift JIS character 0xFE.  Which
gets mapped to U+2122 as an extension (see "APPLE additions over SJIS, we
convert this like Apple, because I think, this gives better result, then [sic]
we take a replacement char" in sal/textenc/tcvtjp6.tab) in readUcs4, but which
in turn doesn't get mapped back to any Shift JIS character in writeEscapeChar.

Translator::translateToExternal is the only user of
rtl_UriEncodeStrictKeepEscapes, as introduced by
6ff5d3341dbc5df3f0cb5368ccb0e1089338916c "INTEGRATION: CWS c07v013_SRC680
(1.4.40); FILE MERGED: 2007/06/21 13:00:56 sb 1.4.40.1: #b6550116# Made
XExternalUriReferenceTranslator.translateToExternal more robust when the input
URL contains spurious non--UTF-8 octets like %FE (which are now copied verbatim,
instead of signalling error)."

To make the claim true that such "spurious non--UTF-8 octets like %FE" are
always "copied verbatim", regardless of text encoding being used, repurpose
rtl_UriEncodeStrictKeepEscapes to always treat any escape sequences that are
present as (potentially broken) UTF-8.

Change-Id: I0fa0b14d3e3d44e4b5514e1b73c84c407a947ce9
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/158888
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

0 files changed, 0 insertions, 0 deletions