Prevent to open a FT_Stream for zero-sized file on non-Unix.

builds/unix/ftsystem.c prevents to open an useless stream from
zero-sized file and returns FT_Err_Cannot_Open_Stream, but the
stream drivers for ANSI C, Amiga and VMS return useless streams.
For cross-platform consistency, all stream drivers should act
same.

* src/base/ftsystem.c (FT_Stream_Open): If the size of the opened
file is zero, FT_Err_Cannot_Open_Stream is returned.
* builds/amiga/src/base/ftsystem.c (FT_Stream_Open): Ditto.
* src/vms/ftsystem.c (FT_Stream_Open): Ditto.

1 files changed, 14 insertions, 3 deletions

diff --git a/src/base/ftsystem.c b/src/base/ftsystem.c
index ba86005c..66c5d76a 100644
--- a/src/base/ftsystem.c
+++ b/src/base/ftsystem.c
@@ -229,6 +229,13 @@
     if ( !stream )
       return FT_Err_Invalid_Stream_Handle;
 
+    stream->descriptor.pointer = NULL;
+    stream->pathname.pointer   = (char*)filepathname;
+    stream->base               = 0;
+    stream->pos                = 0;
+    stream->read               = NULL;
+    stream->close              = NULL;
+
     file = ft_fopen( filepathname, "rb" );
     if ( !file )
     {
@@ -240,12 +247,16 @@
 
     ft_fseek( file, 0, SEEK_END );
     stream->size = ft_ftell( file );
+    if ( !stream->size )
+    {
+      FT_ERROR(( "FT_Stream_Open:" ));
+      FT_ERROR(( " opened `%s' but zero-sized\n", filepathname ));
+      ft_fclose( file );
+      return FT_Err_Cannot_Open_Stream;
+    }
     ft_fseek( file, 0, SEEK_SET );
 
     stream->descriptor.pointer = file;
-    stream->pathname.pointer   = (char*)filepathname;
-    stream->pos                = 0;
-
     stream->read  = ft_ansi_stream_io;
     stream->close = ft_ansi_stream_close;