From: Ibragimov Rinat <ibragimovrinat@mail.ru>
Subject: Fix longlink UTF-8 support in KTar
Bug: http://bugs.kde.org/show_bug.cgi?id=266141
Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=612675
Last-Update: 2011-06-14
Forwarded: yes
Origin: other, http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=612675#5
Acked-By: Modestas Vainius <modax@debian.org>

tar archives have to use "longlink trick" to store names longer than 100 bytes.
KTar class has functions implementing longlink, but they check name length in
_characters_, not in bytes. For non-ASCII characters in UTF-8 length of string
in bytes and length in characters do not match. In my case file had
character-length less than 100 and byte-length greater than 100, so name simply
truncated. Such behavior can be observed on non-ASCII UTF-8 or any other
multibyte encoding. If file name is very long, resulting .tar may become
unreadable.

--- a/kdecore/io/ktar.cpp
+++ b/kdecore/io/ktar.cpp
@@ -745,7 +745,7 @@ bool KTar::doPrepareWriting(const QStrin
     const QByteArray gname = group.toLocal8Bit();
 
     // If more than 100 chars, we need to use the LongLink trick
-    if ( fileName.length() > 99 )
+    if ( encodedFileName.length() > 99 )
         d->writeLonglink(buffer,encodedFileName,'L',uname,gname);
 
     // Write (potentially truncated) name
@@ -798,7 +798,7 @@ bool KTar::doWriteDir(const QString &nam
     QByteArray gname = group.toLocal8Bit();
 
     // If more than 100 chars, we need to use the LongLink trick
-    if ( dirName.length() > 99 )
+    if ( encodedDirname.length() > 99 )
         d->writeLonglink(buffer,encodedDirname,'L',uname,gname);
 
     // Write (potentially truncated) name
@@ -850,9 +850,9 @@ bool KTar::doWriteSymLink(const QString
     QByteArray gname = group.toLocal8Bit();
 
     // If more than 100 chars, we need to use the LongLink trick
-    if (target.length() > 99)
+    if (encodedTarget.length() > 99)
         d->writeLonglink(buffer,encodedTarget,'K',uname,gname);
-    if ( fileName.length() > 99 )
+    if ( encodedFileName.length() > 99 )
         d->writeLonglink(buffer,encodedFileName,'L',uname,gname);
 
     // Write (potentially truncated) name