Reduce memory allocations due to zlib's uncompress().

[tinc] / src / net_packet.c

diff --git a/src/net_packet.c b/src/net_packet.c
index d37f220..3d3d691 100644 (file)
--- a/src/net_packet.c
+++ b/src/net_packet.c
@@ -23,6 +23,7 @@
 #include "system.h"
 
 #ifdef HAVE_ZLIB
+#define ZLIB_CONST
 #include <zlib.h>
 #endif
 
@@ -249,9 +250,22 @@ static length_t uncompress_packet(uint8_t *dest, const uint8_t *source, length_t
 #ifdef HAVE_ZLIB
        else {
                unsigned long destlen = MAXSIZE;
+               static z_stream stream;
 
-               if(uncompress(dest, &destlen, source, len) == Z_OK) {
-                       return destlen;
+               if(stream.next_in) {
+                       inflateReset(&stream);
+               } else {
+                       inflateInit(&stream);
+               }
+
+               stream.next_in = source;
+               stream.avail_in = len;
+               stream.next_out = dest;
+               stream.avail_out = destlen;
+               stream.total_out = 0;
+
+               if(inflate(&stream, Z_FINISH) == Z_STREAM_END) {
+                       return stream.total_out;
                } else {
                        return -1;
                }