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 "jni.h" 18 19 class ScopedUtfChars { 20 public: 21 ScopedUtfChars(JNIEnv* env, jstring s) : env_(env), string_(s) { 22 if (s == NULL) { 23 utf_chars_ = NULL; 24 } else { 25 utf_chars_ = env->GetStringUTFChars(s, NULL); 26 } 27 } 28 29 ~ScopedUtfChars() { 30 if (utf_chars_) { 31 env_->ReleaseStringUTFChars(string_, utf_chars_); 32 } 33 } 34 35 const char* c_str() const { 36 return utf_chars_; 37 } 38 39 private: 40 JNIEnv* env_; 41 jstring string_; 42 const char* utf_chars_; 43 }; 44 45 extern "C" JNIEXPORT jobject JNICALL 46 Java_android_signature_cts_DexMemberChecker_getField_1JNI( 47 JNIEnv* env, jclass, jclass klass, jstring name, jstring type) { 48 ScopedUtfChars utf_name(env, name); 49 ScopedUtfChars utf_type(env, type); 50 jfieldID fid = env->GetFieldID(klass, utf_name.c_str(), utf_type.c_str()); 51 if (env->ExceptionCheck()) { 52 env->ExceptionClear(); 53 return nullptr; 54 } 55 return env->ToReflectedField(klass, fid, /* static */ false); 56 } 57 58 extern "C" JNIEXPORT jobject JNICALL 59 Java_android_signature_cts_DexMemberChecker_getStaticField_1JNI( 60 JNIEnv* env, jclass, jclass klass, jstring name, jstring type) { 61 ScopedUtfChars utf_name(env, name); 62 ScopedUtfChars utf_type(env, type); 63 jfieldID fid = env->GetStaticFieldID(klass, utf_name.c_str(), utf_type.c_str()); 64 if (env->ExceptionCheck()) { 65 env->ExceptionClear(); 66 return nullptr; 67 } 68 return env->ToReflectedField(klass, fid, /* static */ true); 69 } 70 71 extern "C" JNIEXPORT jobject JNICALL 72 Java_android_signature_cts_DexMemberChecker_getMethod_1JNI( 73 JNIEnv* env, jclass, jclass klass, jstring name, jstring signature) { 74 ScopedUtfChars utf_name(env, name); 75 ScopedUtfChars utf_signature(env, signature); 76 jmethodID mid = env->GetMethodID(klass, utf_name.c_str(), utf_signature.c_str()); 77 if (env->ExceptionCheck()) { 78 env->ExceptionClear(); 79 return nullptr; 80 } 81 return env->ToReflectedMethod(klass, mid, /* static */ false); 82 } 83 84 extern "C" JNIEXPORT jobject JNICALL 85 Java_android_signature_cts_DexMemberChecker_getStaticMethod_1JNI( 86 JNIEnv* env, jclass, jclass klass, jstring name, jstring signature) { 87 ScopedUtfChars utf_name(env, name); 88 ScopedUtfChars utf_signature(env, signature); 89 jmethodID mid = env->GetStaticMethodID(klass, utf_name.c_str(), utf_signature.c_str()); 90 if (env->ExceptionCheck()) { 91 env->ExceptionClear(); 92 return nullptr; 93 } 94 return env->ToReflectedMethod(klass, mid, /* static */ true); 95 } 96
