[gzip] Fix access of small compressed files (#45937).

* src/gzip/ftgzip.c (ft_gzip_stream_close): Avoid memory leak.

(ft_gzip_get_uncompressed_file): Correct byte order while reading
unsigned long value.  Without this change, the whole optimization of
accessing small files in `FT_Stream_OpenGzip' is never executed!  As
a consequence, access to PCF files in general (which are normally
small files) should be much improved now as originally intended.

ChangeLog

@@ -1,3 +1,15 @@
+2015-09-13  Werner Lemberg  <wl@gnu.org>
+
+	[gzip] Fix access of small compressed files (#45937).
+
+	* src/gzip/ftgzip.c (ft_gzip_stream_close): Avoid memory leak.
+
+	(ft_gzip_get_uncompressed_file): Correct byte order while reading
+	unsigned long value.  Without this change, the whole optimization of
+	accessing small files in `FT_Stream_OpenGzip' is never executed!  As
+	a consequence, access to PCF files in general (which are normally
+	small files) should be much improved now as originally intended.
+
 2015-09-11  Werner Lemberg  <wl@gnu.org>
 
 	[psaux] Fix potential buffer overflow (#45922).

src/gzip/ftgzip.c

@@ -557,6 +557,9 @@
 
       stream->descriptor.pointer = NULL;
     }
+
+    if ( !stream->read )
+      FT_FREE( stream->base );
   }
 
 
@@ -584,7 +587,7 @@
     old_pos = stream->pos;
     if ( !FT_Stream_Seek( stream, stream->size - 4 ) )
     {
-      result = FT_Stream_ReadULong( stream, &error );
+      result = FT_Stream_ReadULongLE( stream, &error );
       if ( error )
         result = 0;
 
@@ -685,7 +688,7 @@
 
     stream->size  = 0x7FFFFFFFL;  /* don't know the real size! */
     stream->pos   = 0;
-    stream->base  = 0;
+    stream->base  = NULL;
     stream->read  = ft_gzip_stream_io;
     stream->close = ft_gzip_stream_close;