From 516911900b6f21881fa5741f559bb10cad37ac5a Mon Sep 17 00:00:00 2001
From: Ben Hencke <brainstar@gmail.com>
Date: Sat, 15 Feb 2020 06:37:07 -0800
Subject: [PATCH] read can return -1, check for this to avoid corrupting
 protocol

fixes #470
---
 src/WebSockets.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/WebSockets.cpp b/src/WebSockets.cpp
index a3ada67..5d13b86 100644
--- a/src/WebSockets.cpp
+++ b/src/WebSockets.cpp
@@ -595,7 +595,7 @@ bool WebSockets::readCb(WSclient_t * client, uint8_t * out, size_t n, WSreadWait
 
 #else
     unsigned long t = millis();
-    size_t len;
+    ssize_t len;
     DEBUG_WEBSOCKETS("[readCb] n: %zu t: %lu\n", n, t);
     while(n > 0) {
         if(client->tcp == NULL) {
@@ -630,7 +630,7 @@ bool WebSockets::readCb(WSclient_t * client, uint8_t * out, size_t n, WSreadWait
         }
 
         len = client->tcp->read((uint8_t *)out, n);
-        if(len) {
+        if(len > 0) {
             t = millis();
             out += len;
             n -= len;