add WiFiClientSecure::peek(); (#1310)

libraries/WiFiClientSecure/src/WiFiClientSecure.cpp

@@ -39,7 +39,7 @@ WiFiClientSecure::WiFiClientSecure()
     _CA_cert = NULL;
     _cert = NULL;
     _private_key = NULL;
-	next = NULL;			
+    next = NULL;
 }
 
 
@@ -64,7 +64,7 @@ WiFiClientSecure::WiFiClientSecure(int sock)
 WiFiClientSecure::~WiFiClientSecure()
 {
     stop();
-	delete sslclient;				  
+    delete sslclient;
 }
 
 WiFiClientSecure &WiFiClientSecure::operator=(const WiFiClientSecure &other)
@@ -113,6 +113,14 @@ int WiFiClientSecure::connect(const char *host, uint16_t port, const char *_CA_c
     return 1;
 }
 
+int WiFiClientSecure::peek(){
+    if(_peek >= 0){
+        return _peek;
+    }
+    _peek = read();
+    return _peek;
+}
+
 size_t WiFiClientSecure::write(uint8_t data)
 {
     return write(&data, 1);
@@ -120,7 +128,14 @@ size_t WiFiClientSecure::write(uint8_t data)
 
 int WiFiClientSecure::read()
 {
-    uint8_t data = 0;
+    uint8_t data = -1;
+
+    if(_peek >= 0){
+        data = _peek;
+        _peek = -1;
+        return data;
+    }
+
     int res = read(&data, 1);
     if (res < 0) {
         return res;
@@ -143,6 +158,13 @@ size_t WiFiClientSecure::write(const uint8_t *buf, size_t size)
 
 int WiFiClientSecure::read(uint8_t *buf, size_t size)
 {
+    if(_peek >= 0){
+        uint8_t data = -1;
+        data = _peek;
+        _peek = -1;
+        return data;
+    }
+    
     if (!available()) {
         return -1;
     }

libraries/WiFiClientSecure/src/WiFiClientSecure.h

@@ -31,6 +31,7 @@ protected:
     sslclient_context *sslclient;
  
     int _lastError = 0;
+	int _peek = -1;
     const char *_CA_cert;
     const char *_cert;
     const char *_private_key;
@@ -44,15 +45,12 @@ public:
     int connect(const char *host, uint16_t port);
     int connect(IPAddress ip, uint16_t port, const char *rootCABuff, const char *cli_cert, const char *cli_key);
     int connect(const char *host, uint16_t port, const char *rootCABuff, const char *cli_cert, const char *cli_key);
+	int peek();
     size_t write(uint8_t data);
     size_t write(const uint8_t *buf, size_t size);
     int available();
     int read();
     int read(uint8_t *buf, size_t size);
-    int peek()
-    {
-        return 0;
-    }
     void flush() {}
     void stop();
     uint8_t connected();