added "dont compress" option with the default setting of

	*.gz *.tgz *.zip *.z *.rpm *.deb

loadparm.c

@@ -131,6 +131,7 @@ typedef struct
 	char *exclude_from;
 	char *log_format;
 	char *refuse_options;
+	char *dont_compress;
 	int timeout;
 } service;
 
@@ -155,6 +156,7 @@ static service sDefault =
 	NULL,    /* exclude from */
 	"%o %h [%a] %m (%u) %f %l",    /* log format */
 	NULL,    /* refuse options */
+	"*.gz *.tgz *.zip *.z *.rpm *.deb",    /* dont compress */
 	0        /* timeout */
 };
 
@@ -264,6 +266,7 @@ static struct parm_struct parm_table[] =
   {"transfer logging", P_BOOL,    P_LOCAL,  &sDefault.transfer_logging,NULL,0},
   {"log format",       P_STRING,  P_LOCAL,  &sDefault.log_format,  NULL,   0},
   {"refuse options",   P_STRING,  P_LOCAL,  &sDefault.refuse_options,NULL, 0},
+  {"dont compress",    P_STRING,  P_LOCAL,  &sDefault.dont_compress,NULL,  0},
   {NULL,               P_BOOL,    P_NONE,   NULL,                  NULL,   0}
 };
 
@@ -337,6 +340,7 @@ FN_LOCAL_STRING(lp_exclude, exclude)
 FN_LOCAL_STRING(lp_exclude_from, exclude_from)
 FN_LOCAL_STRING(lp_log_format, log_format)
 FN_LOCAL_STRING(lp_refuse_options, refuse_options)
+FN_LOCAL_STRING(lp_dont_compress, dont_compress)
 FN_LOCAL_INTEGER(lp_timeout, timeout)
 
 /* local prototypes */

rsyncd.conf.yo

@@ -294,6 +294,18 @@ prints an error message and exits.
 The full names of the options must be used (ie. you must use
 "compress" not "z" to disable compression).
 
+dit(bf(dont compress)) The "dont compress" option allows you to select
+filenames based on wildcard patterns that should not be compressed
+during transfer. Compression is expensive in terms of CPU usage so it
+is usually good to not try to compress files that won't compress well,
+such as already compressed files. 
+
+The "dont compress" option takes a space separated list of
+case-insensitive wildcard patterns. Any source filename matching one
+of the patterns will not be compressed during transfer.
+
+The default setting is verb(*.gz *.tgz *.zip *.z *.rpm *.deb)
+
 enddit()
 
 manpagesection(AUTHENTICATION STRENGTH)

sender.c

@@ -201,6 +201,8 @@ void send_files(struct file_list *flist,int f_out,int f_in)
 			log_transfer(file, fname+offset);
 		}
 
+		set_compression(fname);
+	  
 		match_sums(f_out,s,buf,st.st_size);
 
 		log_send(file, &initial_stats);

token.c

@@ -21,7 +21,38 @@
 #include "zlib/zlib.h"
 
 extern int do_compression;
+static int compression_level = Z_DEFAULT_COMPRESSION;
 
+/* determine the compression level based on a wildcard filename list */
+void set_compression(char *fname)
+{
+	extern int module_id;
+	char *dont;
+	char *tok;
+
+	if (!do_compression) return;
+
+	compression_level = Z_DEFAULT_COMPRESSION;
+	dont = lp_dont_compress(module_id);
+
+	if (!dont || !*dont) return;
+
+	dont = strdup(dont);
+	fname = strdup(fname);
+	if (!dont || !fname) return;
+
+	strlower(dont);
+	strlower(fname);
+
+	for (tok=strtok(dont," ");tok;tok=strtok(NULL," ")) {
+		if (fnmatch(tok, fname, 0) == 0) {
+			compression_level = 0;
+			break;
+		}
+	}
+	free(dont);
+	free(fname);
+}
 
 /* non-compressing recv token */
 static int simple_recv_token(int f,char **data)
@@ -104,7 +135,7 @@ send_deflated_token(int f, int token,
 			tx_strm.next_in = NULL;
 			tx_strm.zalloc = NULL;
 			tx_strm.zfree = NULL;
-			if (deflateInit2(&tx_strm, Z_DEFAULT_COMPRESSION,
+			if (deflateInit2(&tx_strm, compression_level,
 					 Z_DEFLATED, -15, 8,
 					 Z_DEFAULT_STRATEGY) != Z_OK) {
 				rprintf(FERROR, "compression init failed\n");