Repo created

TMessagesProj/jni/voip/libtgvoip/os/android/JNIUtilities.h

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+//
+// Created by Grishka on 15.08.2018.
+//
+
+#ifndef LIBTGVOIP_JNIUTILITIES_H
+#define LIBTGVOIP_JNIUTILITIES_H
+
+#include <functional>
+#include <jni.h>
+#include <stdarg.h>
+#include <string>
+#include "../../Buffers.h"
+
+extern JavaVM* sharedJVM;
+
+namespace tgvoip{
+	namespace jni{
+
+		inline JNIEnv *GetEnv() {
+			JNIEnv *env = nullptr;
+			sharedJVM->GetEnv((void **) &env, JNI_VERSION_1_6);
+			return env;
+		}
+
+		inline void DoWithJNI(std::function<void(JNIEnv*)> f){
+			JNIEnv *env=GetEnv();
+			bool didAttach=false;
+			if(!env){
+				sharedJVM->AttachCurrentThread(&env, NULL);
+				didAttach=true;
+			}
+
+			f(env);
+
+			if(didAttach){
+				sharedJVM->DetachCurrentThread();
+			}
+		}
+
+		inline void AttachAndCallVoidMethod(jmethodID method, jobject obj, ...){
+			if(!method || !obj)
+				return;
+			va_list va;
+			va_start(va, obj);
+			DoWithJNI([&va, method, obj](JNIEnv* env){
+				env->CallVoidMethodV(obj, method, va);
+			});
+			va_end(va);
+		}
+
+		inline std::string JavaStringToStdString(JNIEnv* env, jstring jstr){
+			if(!jstr)
+				return "";
+			const char* jchars=env->GetStringUTFChars(jstr, NULL);
+			std::string str(jchars);
+			env->ReleaseStringUTFChars(jstr, jchars);
+			return str;
+		}
+
+		inline jbyteArray BufferToByteArray(JNIEnv* env, Buffer& buf){
+			jbyteArray arr=env->NewByteArray((jsize)buf.Length());
+			jbyte* elements=env->GetByteArrayElements(arr, NULL);
+			memcpy(elements, *buf, buf.Length());
+			env->ReleaseByteArrayElements(arr, elements, 0);
+			return arr;
+		}
+	}
+}
+
+#endif //LIBTGVOIP_JNIUTILITIES_H