tdf#108349: fix LanguageType conversions from UNO "short"

The bugdoc uses LANGUAGE_USER_LATIN_VATICAN LanguageType(0x8076).

The UNO API uses signed "short" for these in various interfaces,
and so the LanguageType constructor complains about
out-of-(short)-range values.

Avoid this by deleting the problematic constructor, so that the places
that currently call it with API parameters can be changed to first
cast the parameter to unsigned.

(Yes, we need to write "template<>" twice in a row. Don't ask me why, i
 just work here. sberg says we also need to omit the explict <short>.)

Change-Id: I2443a89bc8d579504fc707ded3d145f9a625597a
Reviewed-on: https://gerrit.libreoffice.org/38473
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>

4 files changed, 17 insertions, 8 deletions

diff --git a/include/i18nlangtag/lang.h b/include/i18nlangtag/lang.h
index 07cb601e9d78..cc87c8283b1b 100644
--- a/include/i18nlangtag/lang.h
+++ b/include/i18nlangtag/lang.h
@@ -95,6 +95,15 @@ struct LanguageTypeTag {};
 typedef o3tl::strong_int<sal_uInt16, LanguageTypeTag> LanguageType;
 inline std::ostream& operator<<(std::ostream& os, LanguageType const & lt) { os << sal_uInt16(lt); return os; }
 constexpr LanguageType primary(LanguageType lt) { return LanguageType(sal_uInt16(lt) & 0x03ff); }
+
+namespace o3tl
+{
+    // delete "sal_Int16" constructor via specialization: values > 0x7FFF are
+    // actually used, and unfortunately passed around in the API as signed
+    // "short", so use this to find all places where casts must be inserted
+    template<> template<> constexpr strong_int<unsigned short,LanguageTypeTag>::strong_int(short, std::enable_if<std::is_integral<short>::value, int>::type) = delete;
+}
+
 #endif
 
 #define LANGUAGE_MASK_PRIMARY 0x03ff
diff --git a/linguistic/source/spelldsp.cxx b/linguistic/source/spelldsp.cxx
index 404b350a05d7..5958d5980c60 100644
--- a/linguistic/source/spelldsp.cxx
+++ b/linguistic/source/spelldsp.cxx
@@ -757,7 +757,7 @@ sal_Bool SAL_CALL SpellCheckerDispatcher::hasLanguage(
     sal_Int16 nLanguage )
 {
     MutexGuard  aGuard( GetLinguMutex() );
-    return hasLocale( LanguageTag::convertToLocale( LanguageType(nLanguage)) );
+    return hasLocale( LanguageTag::convertToLocale(LanguageType(static_cast<sal_uInt16>(nLanguage))));
 }
 
 
@@ -767,7 +767,7 @@ sal_Bool SAL_CALL SpellCheckerDispatcher::isValid(
     const uno::Sequence< beans::PropertyValue >& rProperties )
 {
     MutexGuard  aGuard( GetLinguMutex() );
-    return isValid( rWord, LanguageTag::convertToLocale( LanguageType(nLanguage) ), rProperties);
+    return isValid( rWord, LanguageTag::convertToLocale(LanguageType(static_cast<sal_uInt16>(nLanguage))), rProperties);
 }
 
 
@@ -777,7 +777,7 @@ uno::Reference< linguistic2::XSpellAlternatives > SAL_CALL SpellCheckerDispatche
     const uno::Sequence< beans::PropertyValue >& rProperties )
 {
     MutexGuard  aGuard( GetLinguMutex() );
-    return spell( rWord, LanguageTag::convertToLocale( LanguageType(nLanguage) ), rProperties);
+    return spell(rWord, LanguageTag::convertToLocale(LanguageType(static_cast<sal_uInt16>(nLanguage))), rProperties);
 }
 
 
diff --git a/sw/source/filter/ww8/ww8scan.cxx b/sw/source/filter/ww8/ww8scan.cxx
index 2f28c36a2f22..c3154ffb064e 100644
--- a/sw/source/filter/ww8/ww8scan.cxx
+++ b/sw/source/filter/ww8/ww8scan.cxx
@@ -5530,8 +5530,8 @@ WW8Fib::WW8Fib(SvStream& rSt, sal_uInt8 nWantedVersion, sal_uInt32 nOffset)
     sal_Int16 cpnBtePap_Ver67=0;
 
     // read FIB
-    sal_Int16 nTmpLid = 0;
-    rSt.ReadInt16( nTmpLid );
+    sal_uInt16 nTmpLid = 0;
+    rSt.ReadUInt16(nTmpLid);
     m_lid = LanguageType(nTmpLid);
     rSt.ReadInt16( m_pnNext );
     rSt.ReadUChar( aBits1 );
@@ -5578,8 +5578,8 @@ WW8Fib::WW8Fib(SvStream& rSt, sal_uInt8 nWantedVersion, sal_uInt32 nOffset)
         && (bVer67 || WW8ReadINT16(  rSt, pnLvcFirst_W6                 ))  // 8
         && (bVer67 || WW8ReadINT16(  rSt, cpnBteLvc_W6                  ))  // 9
         */
-        sal_Int16 nTmpFE = 0;
-        rSt.ReadInt16( nTmpFE );
+        sal_uInt16 nTmpFE = 0;
+        rSt.ReadUInt16(nTmpFE);
         m_lidFE = LanguageType(nTmpFE);
         rSt.ReadUInt16( m_clw );
     }
diff --git a/unotools/source/config/lingucfg.cxx b/unotools/source/config/lingucfg.cxx
index 9dfc019b19ac..d11b9c62fd6f 100644
--- a/unotools/source/config/lingucfg.cxx
+++ b/unotools/source/config/lingucfg.cxx
@@ -524,7 +524,7 @@ bool SvtLinguConfigItem::SetProperty( sal_Int32 nPropertyHandle, const uno::Any
         {
             if (nNew != (sal_uInt16)*plVal)
             {
-                *plVal = LanguageType(nNew);
+                *plVal = LanguageType(static_cast<sal_uInt16>(nNew));
                 bMod = true;
             }
             bSucc = true;