Update code to v1.0.14 (10)

android/app/src/main/cpp/Utility.h

@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2022  Gaurav Ujjwal.
+ *
+ * SPDX-License-Identifier:  GPL-3.0-or-later
+ *
+ * See COPYING.txt for more details.
+ */
+
+#ifndef AVNC_UTILITY_H
+#define AVNC_UTILITY_H
+
+#include <stdarg.h>
+#include <netdb.h>
+#include <errno.h>
+#include <android/log.h>
+
+
+/******************************************************************************
+ * Utilities
+ *****************************************************************************/
+
+/**
+ * Returns a native copy of the given jstring.
+ * Caller is responsible for releasing the memory.
+ */
+static char *getNativeStrCopy(JNIEnv *env, jstring jStr) {
+    const char *cStr = env->GetStringUTFChars(jStr, nullptr);
+    char *str = strdup(cStr);
+    env->ReleaseStringUTFChars(jStr, cStr);
+    return str;
+}
+
+/******************************************************************************
+ * Logging
+ *****************************************************************************/
+const char *LOG_TAG = "NativeVnc";
+
+void log_info(const char *fmt, ...) {
+    va_list args;
+    va_start(args, fmt);
+    __android_log_vprint(ANDROID_LOG_INFO, LOG_TAG, fmt, args);
+    va_end(args);
+}
+
+void log_error(const char *fmt, ...) {
+    va_list args;
+    va_start(args, fmt);
+    __android_log_vprint(ANDROID_LOG_ERROR, LOG_TAG, fmt, args);
+    va_end(args);
+}
+
+/**
+ * Converts given errno value to its description.
+ */
+static const char *errnoToStr(int e) {
+
+    // LibVNC is patched to report `getaddrinfo` errors as negative 'errno'.
+    // See ConnectClientToTcpAddr6WithTimeout() in sockets.c
+    if (e < -1000) {
+        return gai_strerror((-e) - 1000);
+    }
+
+    switch (e) {
+        case ENETDOWN:
+        case ENETRESET:
+        case ENETUNREACH:
+        case ECONNABORTED:
+        case EHOSTDOWN:
+        case EHOSTUNREACH:
+        case ETIMEDOUT:
+        case ENOMEM:
+        case EPROTO:
+        case EIO:
+            return strerror(e);
+
+        case ECONNREFUSED:
+            return "Connection refused! Server may be down or running on different port";
+
+        case ECONNRESET:
+            return "Connection closed by server";
+
+        case EACCES:
+            return "Authentication failed";
+
+        default:
+            // In this case we don't want to display errno description to user
+            // because it is more likely to be misleading (e.g. EINTR, EAGAIN).
+            // BUT add it to logs in case LibVNC didn't.
+            log_error("errnoToStr: (%d %s)", errno, strerror(errno));
+            return "";
+    }
+}
+
+#endif //AVNC_UTILITY_H