chore: import upstream snapshot with attribution

paddle/fluid/inference/experimental/javaapi/native/jni_convert_util.h

@@ -0,0 +1,128 @@
+// Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+//
+// 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.
+
+#ifndef PADDLE_FLUID_INFERENCE_JAVAAPI_NATIVE_JNI_CONVERT_UTIL_H_  // NOLINT
+#define PADDLE_FLUID_INFERENCE_JAVAAPI_NATIVE_JNI_CONVERT_UTIL_H_
+
+#include <jni.h>
+#include <string.h>
+
+#include <string>
+#include <vector>
+
+#define PADDLE_WITH_CUDA PADDLE_WITH_CUDA
+
+inline std::string jstring_to_cpp_string(JNIEnv *env, jstring jstr) {
+  if (!jstr) {
+    return "";
+  }
+  const jclass stringClass = env->GetObjectClass(jstr);
+  const jmethodID getBytes =
+      env->GetMethodID(stringClass, "getBytes", "(Ljava/lang/String;)[B");
+  const jbyteArray stringJbytes = (jbyteArray)env->CallObjectMethod(
+      jstr, getBytes, env->NewStringUTF("UTF-8"));
+
+  size_t length = static_cast<size_t>(env->GetArrayLength(stringJbytes));
+  jbyte *pBytes = env->GetByteArrayElements(stringJbytes, NULL);
+
+  std::string ret = std::string(reinterpret_cast<char *>(pBytes), length);
+  env->ReleaseByteArrayElements(stringJbytes, pBytes, JNI_ABORT);
+
+  env->DeleteLocalRef(stringJbytes);
+  env->DeleteLocalRef(stringClass);
+  return ret;
+}
+
+inline jstring cpp_string_to_jstring(JNIEnv *env, std::string str) {
+  auto *data = str.c_str();
+  jclass strClass = env->FindClass("java/lang/String");
+  jmethodID strClassInitMethodID =
+      env->GetMethodID(strClass, "<init>", "([BLjava/lang/String;)V");
+
+  jbyteArray bytes = env->NewByteArray(strlen(data));
+  env->SetByteArrayRegion(
+      bytes, 0, strlen(data), reinterpret_cast<const jbyte *>(data));
+
+  jstring encoding = env->NewStringUTF("UTF-8");
+  jstring res = (jstring)(env->NewObject(
+      strClass, strClassInitMethodID, bytes, encoding));
+
+  env->DeleteLocalRef(strClass);
+  env->DeleteLocalRef(encoding);
+  env->DeleteLocalRef(bytes);
+
+  return res;
+}
+
+inline jboolean cpp_bool_to_jboolean(JNIEnv *env, bool flag) {
+  return flag ? JNI_TRUE : JNI_FALSE;
+}
+
+inline bool jboolean_to_cpp_bool(JNIEnv *env, jboolean flag) {
+  return flag == JNI_TRUE;
+}
+
+inline jfloatArray cpp_array_to_jfloatarray(JNIEnv *env,
+                                            const float *buf,
+                                            int64_t len) {
+  jfloatArray result = env->NewFloatArray(len);
+  env->SetFloatArrayRegion(result, 0, len, buf);
+  return result;
+}
+
+inline jbyteArray cpp_array_to_jbytearray(JNIEnv *env,
+                                          const int8_t *buf,
+                                          int64_t len) {
+  jbyteArray result = env->NewByteArray(len);
+  env->SetByteArrayRegion(result, 0, len, buf);
+  return result;
+}
+
+inline jintArray cpp_array_to_jintarray(JNIEnv *env,
+                                        const int *buf,
+                                        int64_t len) {
+  jintArray result = env->NewIntArray(len);
+  env->SetIntArrayRegion(result, 0, len, buf);
+  return result;
+}
+
+inline jlongArray cpp_array_to_jlongarray(JNIEnv *env,
+                                          const int64_t *buf,
+                                          int64_t len) {
+  jlongArray result = env->NewLongArray(len);
+  env->SetLongArrayRegion(result, 0, len, buf);
+  return result;
+}
+
+inline jlongArray int64_vector_to_jlongarray(JNIEnv *env,
+                                             const std::vector<int64_t> &vec) {
+  jlongArray result = env->NewLongArray(vec.size());
+  jlong *buf = new jlong[vec.size()];
+  for (size_t i = 0; i < vec.size(); ++i) {
+    buf[i] = (jlong)vec[i];
+  }
+  env->SetLongArrayRegion(result, 0, vec.size(), buf);
+  delete[] buf;
+  return result;
+}
+
+inline std::vector<int64_t> jlongarray_to_int64_vector(JNIEnv *env,
+                                                       jlongArray dims) {
+  int dim_size = env->GetArrayLength(dims);
+  jlong *dim_nums = env->GetLongArrayElements(dims, nullptr);
+  std::vector<int64_t> dim_vec(dim_nums, dim_nums + dim_size);
+  env->ReleaseLongArrayElements(dims, dim_nums, 0);
+  return dim_vec;
+}
+#endif  // PADDLE_FLUID_INFERENCE_JAVAAPI_NATIVE_JNI_CONVERT_UTIL_H_ // NOLINT