Index: config.c
===================================================================
--- config.c.orig	2008-06-02 12:26:14.000000000 +0200
+++ config.c	2009-03-06 14:21:45.000000000 +0100
@@ -483,7 +483,7 @@
 static int readConfigFile(const char *configFile, struct logInfo *defConfig)
 {
     int fd;
-    char *buf, *endtag;
+    char *buf, *endtag, *compresscmd_base;
     char oldchar, foo;
     off_t length;
     int lineNum = 1;
@@ -1189,6 +1189,18 @@
 		message(MESS_DEBUG, "compress_prog is now %s\n",
 			newlog->compress_prog);
 
+		compresscmd_base=strdup(basename(newlog->compress_prog));
+		i=0; /* have to check whether we may do this! */
+		/* we check whether we changed the compress_cmd. In case we use the apropriate extension
+		   as listed in compress_cmd_list */
+		while ((i>=0)&&(strcmp(compress_cmd_list[i][0], "EOLIST"))){
+		    if (0==strcmp(compress_cmd_list[i][0], compresscmd_base)){
+			newlog->compress_ext=strdup((char *)compress_cmd_list[i][1]);
+			message(MESS_DEBUG, "compress_ext was changed to %s\n", newlog->compress_ext);
+			i=-10; /* terminate loop! */
+		    }
+		    i++;
+		}
 	    } else if (!strcmp(start, "uncompresscmd")) {
 		*endtag = oldchar, start = endtag;
 
Index: logrotate.c
===================================================================
--- logrotate.c.orig	2008-10-15 15:07:43.000000000 +0200
+++ logrotate.c	2009-03-06 14:21:45.000000000 +0100
@@ -54,6 +54,16 @@
 int numLogs = 0;
 int debug = 0;
 char *mailCommand = DEFAULT_MAIL_COMMAND;
+/* This is the declaration. Note the "2" is needed in the definition (logrotate.h), too! */
+const char * compress_cmd_list[][2] = {
+  {"gzip", ".gz"},
+  {"bzip2", ".bz2"},
+  {"xz", ".xz"},
+  {"compress", ".Z"},
+  {"zip", "zip"},
+  {"EOLIST", "EOLIST"} /* end-marker */
+};
+
 time_t nowSecs = 0;
 
 static int shred_file(char *filename, struct logInfo *log);
Index: logrotate.h
===================================================================
--- logrotate.h.orig	2008-05-09 09:28:59.000000000 +0200
+++ logrotate.h	2009-03-06 14:21:45.000000000 +0100
@@ -61,6 +61,9 @@
 extern int numLogs;
 extern int debug;
 
+/* This is the definition. Note we have to carry the "2" within the declaration (logrotate.c), too! */
+extern const char * compress_cmd_list[][2];
+
 int readAllConfigPaths(const char **paths);
 
 #endif