opt: remove qtext codec from indexzip.cc

src/common/iconv.cc

@@ -121,3 +121,14 @@ QString Iconv::toQString( char const * fromEncoding, void const * fromData, size
   Iconv ic( fromEncoding );
   return ic.convert( fromData, dataSize );
 }
+QString Iconv::findValidEncoding( const QStringList & encodings )
+{
+  for ( const QString & encoding : encodings ) {
+    iconv_t cd = iconv_open( "UTF-8", encoding.toUtf8().constData() );
+    if ( cd != (iconv_t)-1 ) {
+      iconv_close( cd );
+      return encoding;
+    }
+  }
+  return {};
+}

src/common/iconv.hh

@@ -6,6 +6,7 @@
 #include "ex.hh"
 #include "text.hh"
 #include <QString>
+#include <QStringList>
 #include <iconv.h>
 
 /// "Internationalization conversion" for char encoding conversion, currently implemented with iconv()
@@ -34,7 +35,8 @@ public:
   static std::string toUtf8( char const * fromEncoding, std::u32string_view str );
 
   static QString toQString( char const * fromEncoding, void const * fromData, size_t dataSize );
-
+  // tries to find a valid encoding from the given list of encodings.
+  static QString findValidEncoding( const QStringList & encodings );
   // Copying/assigning isn't supported
   Q_DISABLE_COPY_MOVE( Iconv );
 };

src/dict/utils/indexedzip.cc

@@ -6,8 +6,6 @@
 #include <zlib.h>
 #include "text.hh"
 #include "iconv.hh"
-#include <QtCore5Compat/QTextCodec>
-
 #include <QMutexLocker>
 
 using namespace BtreeIndexing;
@@ -160,10 +158,6 @@ bool IndexedZip::indexFile( BtreeIndexing::IndexedWords & zipFileNames, quint32
   }
 
   // File seems to be a valid zip file
-
-
-  QTextCodec * localeCodec = QTextCodec::codecForLocale();
-
   ZipFile::CentralDirEntry entry;
 
   bool alreadyCounted;
@@ -177,102 +171,32 @@ bool IndexedZip::indexFile( BtreeIndexing::IndexedWords & zipFileNames, quint32
       continue;
     }
 
-    // Check if the file name has some non-ascii letters.
-
-    unsigned char const * ptr = (unsigned char const *)entry.fileName.constData();
-
-    bool hasNonAscii = false;
-
-    for ( ;; ) {
-      if ( *ptr & 0x80 ) {
-        hasNonAscii = true;
-        break;
-      }
-      else if ( !*ptr++ ) {
-        break;
-      }
-    }
-
-    alreadyCounted = false;
-
-    if ( !hasNonAscii ) {
-      // Add entry as is
-
+    if ( entry.fileNameInUTF8 ) {
       zipFileNames.addSingleWord( Text::toUtf32( entry.fileName.data() ), entry.localHeaderOffset );
       if ( filesCount ) {
         *filesCount += 1;
       }
     }
     else {
-      // Try assuming different encodings. Those are UTF8, system locale and two
-      // Russian ones (Windows and Windows OEM). Unfortunately, zip
-      // files do not say which encoding they utilize.
-
-      // Utf8
       try {
-        std::u32string decoded = Text::toUtf32( entry.fileName.constData() );
-
-        zipFileNames.addSingleWord( decoded, entry.localHeaderOffset );
-        if ( filesCount != 0 && !alreadyCounted ) {
-          *filesCount += 1;
-          alreadyCounted = true;
+        //detect encoding.
+        auto encoding = Iconv::findValidEncoding( { "LOCAL", "IBM437", "CP866", "CP1251", "UTF-8" } );
+        if ( encoding.isEmpty() ) {
+          qWarning() << "Zip warning: failed to detect encoding -- skipping file" << entry.fileName.data();
+          continue;
         }
-      }
-      catch ( Text::exCantDecode & ) {
-        // Failed to decode
-      }
+        std::u32string nameInSystemLocale =
+          Iconv::toWstring( encoding.toUtf8().constData(), entry.fileName.constData(), entry.fileName.size() );
+        if ( !nameInSystemLocale.empty() ) {
+          zipFileNames.addSingleWord( nameInSystemLocale, entry.localHeaderOffset );
 
-      if ( !entry.fileNameInUTF8 ) {
-        std::u32string nameInSystemLocale;
-
-        // System locale
-        if ( localeCodec ) {
-          QString name       = localeCodec->toUnicode( entry.fileName.constData(), entry.fileName.size() );
-          nameInSystemLocale = name.toStdU32String();
-          if ( !nameInSystemLocale.empty() ) {
-            zipFileNames.addSingleWord( nameInSystemLocale, entry.localHeaderOffset );
-
-            if ( filesCount != 0 && !alreadyCounted ) {
-              *filesCount += 1;
-              alreadyCounted = true;
-            }
+          if ( filesCount != 0 ) {
+            *filesCount += 1;
           }
         }
-
-
-        // CP866
-        try {
-          std::u32string decoded = Iconv::toWstring( "CP866", entry.fileName.constData(), entry.fileName.size() );
-
-          if ( nameInSystemLocale != decoded ) {
-            zipFileNames.addSingleWord( decoded, entry.localHeaderOffset );
-
-            if ( filesCount != 0 && !alreadyCounted ) {
-              *filesCount += 1;
-              alreadyCounted = true;
-            }
-          }
-        }
-        catch ( Iconv::Ex & ) {
-          // Failed to decode
-        }
-
-        // CP1251
-        try {
-          std::u32string decoded = Iconv::toWstring( "CP1251", entry.fileName.constData(), entry.fileName.size() );
-
-          if ( nameInSystemLocale != decoded ) {
-            zipFileNames.addSingleWord( decoded, entry.localHeaderOffset );
-
-            if ( filesCount != 0 && !alreadyCounted ) {
-              *filesCount += 1;
-              alreadyCounted = true;
-            }
-          }
-        }
-        catch ( Iconv::Ex & ) {
-          // Failed to decode
-        }
+      }
+      catch ( Iconv::Ex & ) {
+        // Failed to decode
       }
     }
   }