Fix some crashes (issue #1076)

bgl.cc

@@ -289,11 +289,14 @@ namespace
 
     size_t len = idx.read< uint32_t >();
 
+    if( len )
+    {
       vector< char > nameBuf( len );
 
       idx.read( &nameBuf.front(), len );
 
       dictionaryName = string( &nameBuf.front(), len );
+    }
 
     // Initialize the index
 

dictdfiles.cc

@@ -161,8 +161,11 @@ DictdDictionary::DictdDictionary( string const & id,
   idx.seek( sizeof( idxHeader ) );
 
   vector< char > dName( idx.read< uint32_t >() );
+  if( dName.size() > 0 )
+  {
     idx.read( &dName.front(), dName.size() );
     dictionaryName = string( &dName.front(), dName.size() );
+  }
 
   // Open the .dict file
 

dsl.cc

@@ -310,12 +310,18 @@ DslDictionary::DslDictionary( string const & id,
   idx.seek( sizeof( idxHeader ) );
 
   vector< char > dName( idx.read< uint32_t >() );
+  if( dName.size() > 0 )
+  {
     idx.read( &dName.front(), dName.size() );
     dictionaryName = string( &dName.front(), dName.size() );
+  }
 
   vector< char > sName( idx.read< uint32_t >() );
+  if( sName.size() > 0 )
+  {
     idx.read( &sName.front(), sName.size() );
     preferredSoundDictionary = string( &sName.front(), sName.size() );
+  }
 
   // Everything else would be done in deferred init
 }

epwing.cc

@@ -204,8 +204,11 @@ EpwingDictionary::EpwingDictionary( string const & id,
 {
   vector< char > data( idxHeader.nameSize );
   idx.seek( sizeof( idxHeader ) );
+  if( data.size() > 0 )
+  {
     idx.read( &data.front(), idxHeader.nameSize );
     bookName = string( &data.front(), idxHeader.nameSize );
+  }
 
   // Initialize eBook
 

gls.cc

@@ -549,8 +549,11 @@ GlsDictionary::GlsDictionary( string const & id,
   idx.seek( sizeof( idxHeader ) );
 
   vector< char > dName( idx.read< uint32_t >() );
+  if( dName.size() > 0 )
+  {
     idx.read( &dName.front(), dName.size() );
     dictionaryName = string( &dName.front(), dName.size() );
+  }
 
   // Initialize the index
 

mdx.cc

@@ -303,14 +303,20 @@ MdxDictionary::MdxDictionary( string const & id, string const & indexFile,
   idx.seek( sizeof( idxHeader ) );
   size_t len = idx.read< uint32_t >();
   vector< char > buf( len );
+  if( len > 0 )
+  {
     idx.read( &buf.front(), len );
     dictionaryName = string( &buf.front(), len );
+  }
 
   // then read the dictionary's encoding
   len = idx.read< uint32_t >();
+  if( len > 0 )
+  {
     buf.resize( len );
     idx.read( &buf.front(), len );
     encoding = string( &buf.front(), len );
+  }
 
   dictFile.setFileName( QString::fromUtf8( dictionaryFiles[ 0 ].c_str() ) );
   dictFile.open( QIODevice::ReadOnly );

sdict.cc

@@ -212,8 +212,11 @@ SdictDictionary::SdictDictionary( string const & id,
 
     idx.seek( sizeof( idxHeader ) );
     vector< char > dName( idx.read< uint32_t >() );
+    if( dName.size() > 0 )
+    {
       idx.read( &dName.front(), dName.size() );
       dictionaryName = string( &dName.front(), dName.size() );
+    }
 
     // Initialize the index
 

stardict.cc

@@ -312,6 +312,9 @@ void StardictDictionary::loadIcon() throw()
 
 string StardictDictionary::loadString( size_t size )
 {
+  if( size == 0 )
+    return string();
+
   vector< char > data( size );
 
   idx.read( &data.front(), data.size() );

utf8.cc

@@ -133,6 +133,9 @@ long decode( char const * in_, size_t inSize, wchar * out_ )
 
 string encode( wstring const & in ) throw()
 {
+  if( in.size() == 0 )
+    return string();
+
   std::vector< char > buffer( in.size() * 4 );
 
   return string( &buffer.front(),