1 /*
2 * Copyright (C) 2018 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "utils/java/jni-base.h"
18
19 #include <jni.h>
20 #include <type_traits>
21 #include <vector>
22
23 #include "utils/base/integral_types.h"
24 #include "utils/java/scoped_local_ref.h"
25 #include "utils/java/string_utils.h"
26 #include "utils/memory/mmap.h"
27
28 using libtextclassifier3::JStringToUtf8String;
29 using libtextclassifier3::ScopedLocalRef;
30
31 namespace libtextclassifier3 {
32
ToStlString(JNIEnv * env,const jstring & str)33 std::string ToStlString(JNIEnv* env, const jstring& str) {
34 std::string result;
35 JStringToUtf8String(env, str, &result);
36 return result;
37 }
38
GetFdFromFileDescriptor(JNIEnv * env,jobject fd)39 jint GetFdFromFileDescriptor(JNIEnv* env, jobject fd) {
40 ScopedLocalRef<jclass> fd_class(env->FindClass("java/io/FileDescriptor"),
41 env);
42 if (fd_class == nullptr) {
43 TC3_LOG(ERROR) << "Couldn't find FileDescriptor.";
44 return reinterpret_cast<jlong>(nullptr);
45 }
46 jfieldID fd_class_descriptor =
47 env->GetFieldID(fd_class.get(), "descriptor", "I");
48 if (fd_class_descriptor == nullptr) {
49 env->ExceptionClear();
50 fd_class_descriptor = env->GetFieldID(fd_class.get(), "fd", "I");
51 }
52 if (fd_class_descriptor == nullptr) {
53 TC3_LOG(ERROR) << "Couldn't find descriptor.";
54 return reinterpret_cast<jlong>(nullptr);
55 }
56 return env->GetIntField(fd, fd_class_descriptor);
57 }
58
GetFdFromAssetFileDescriptor(JNIEnv * env,jobject afd)59 jint GetFdFromAssetFileDescriptor(JNIEnv* env, jobject afd) {
60 ScopedLocalRef<jclass> afd_class(
61 env->FindClass("android/content/res/AssetFileDescriptor"), env);
62 if (afd_class == nullptr) {
63 TC3_LOG(ERROR) << "Couldn't find AssetFileDescriptor.";
64 return reinterpret_cast<jlong>(nullptr);
65 }
66 jmethodID afd_class_getFileDescriptor = env->GetMethodID(
67 afd_class.get(), "getFileDescriptor", "()Ljava/io/FileDescriptor;");
68 if (afd_class_getFileDescriptor == nullptr) {
69 TC3_LOG(ERROR) << "Couldn't find getFileDescriptor.";
70 return reinterpret_cast<jlong>(nullptr);
71 }
72 jobject bundle_jfd = env->CallObjectMethod(afd, afd_class_getFileDescriptor);
73 return GetFdFromFileDescriptor(env, bundle_jfd);
74 }
75
76 } // namespace libtextclassifier3
77