Add an API to get the file extension for a compression type, and use it.

Add wtap_compressed_file_extension(), which returns NULL for
WTAP_UNCOMPRESSED and the appropriate file extension for other
compression types.

Add wtap_compression_type_supported(), which returns TRUE for
WTAP_UNCOMPRESSED and all supported compression types and FALSE
otherwise.  ("Supported" means "the code can decompmress files in that
compression format and can write files in that compression format", so
WTAP_GAIP_COMPRESSED is supported iff libwiretap is built with zlib.)

In MainWindow::fileAddExtension, instead of checking for
WTAP_GZIP_COMPRESSED and using ".gz" as the extension, use the extension
returned by wtap_compressed_file_extension() for the compression type.

Change-Id: I47cb0eca8c887ada3562df30b54e76509008180f
Reviewed-on: https://code.wireshark.org/review/30707
Reviewed-by: Guy Harris <guy@alum.mit.edu>

1 files changed, 1 insertions, 1 deletions

diff --git a/ui/qt/main_window.cpp b/ui/qt/main_window.cpp
index aba97e09a1..635afaecaa 100644
--- a/ui/qt/main_window.cpp
+++ b/ui/qt/main_window.cpp
@@ -1665,7 +1665,7 @@ void MainWindow::fileAddExtension(QString &file_name, int file_type, wtap_compre
     /* Get the extension for the compression type we'll be using, or
        NULL if we won't be compressing it. */
     compressed_file_extension =
-        (compression_type == WTAP_UNCOMPRESSED) ? NULL : "gz";
+        (compression_type == WTAP_UNCOMPRESSED) ? NULL : wtap_compressed_file_extension(compression_type);
 
     if (extensions_list != NULL) {
         GSList *extension;