rar reader: fix cast to unsigned int (#2209)

Fixes compiler error `C4267: '+=': conversion from 'size_t' to 'unsigned int'.
Possible loss of data.` which stops compiling with MSVC.

diff --git a/libarchive/archive_read_support_format_rar.c b/libarchive/archive_read_support_format_rar.c
index 123813084ccb295181aa762a586400302b213dfb..354cb0d0bab560c69b7367f17e5e5a7a4f296a76 100644 (file)
--- a/libarchive/archive_read_support_format_rar.c
+++ b/libarchive/archive_read_support_format_rar.c
@@ -3142,7 +3142,7 @@ copy_from_lzss_window_to_unp(struct archive_read *a, const void **buffer,
   } else {
       goto fatal;
   }
-  rar->unp_offset += length;
+  rar->unp_offset += (unsigned int) length;
   if (rar->unp_offset >= rar->unp_buffer_size)
     *buffer = rar->unp_buffer;
   else