output allow LWS_PRE+4 on top of rx_buffer_size for max send chunk

https://github.com/warmcat/libwebsockets/issues/522

Signed-off-by: Andy Green <andy@warmcat.com>

diff --git a/lib/output.c b/lib/output.c
index 3dbe8bb17cf18d0fa6eda6f49a6cf89d40ae0a54..656cfafb514f8251f88c570a409f24092aa86b2b 100644 (file)
--- a/lib/output.c
+++ b/lib/output.c
@@ -127,7 +127,7 @@ int lws_issue_raw(struct lws *wsi, unsigned char *buf, size_t len)
                lwsl_warn("** error invalid sock but expected to send\n");
 
        /* limit sending */
-       n = wsi->protocol->rx_buffer_size;
+       n = wsi->protocol->rx_buffer_size + LWS_PRE + 4;
        if (!n)
                n = LWS_MAX_SOCKET_IO_BUF;
        if (n > len)