/**
 * Copyright 2020 Huawei Technologies Co., Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "common/jni_utils.h"
#include <cstring>

char *JstringToChar(JNIEnv *env, jstring jstr) {
  char *rtn = nullptr;
  jclass clsstring = env->FindClass("java/lang/String");
  jstring strencode = env->NewStringUTF("GB2312");
  jmethodID mid = env->GetMethodID(clsstring, "getBytes", "(Ljava/lang/String;)[B");
  jbyteArray barr = (jbyteArray)env->CallObjectMethod(jstr, mid, strencode);
  jsize alen = env->GetArrayLength(barr);
  jbyte *ba = env->GetByteArrayElements(barr, JNI_FALSE);
  if (alen > 0) {
    rtn = new char[alen + 1];
    memcpy(rtn, ba, alen);
    rtn[alen] = 0;
  }
  env->ReleaseByteArrayElements(barr, ba, 0);
  return rtn;
}