1 /*
2 * Copyright (C) 2010 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 #define LOG_TAG "KeyEvent-JNI"
18
19 #include <nativehelper/JNIHelp.h>
20
21 #include <android_runtime/AndroidRuntime.h>
22 #include <android_runtime/Log.h>
23 #include <attestation/HmacKeyManager.h>
24 #include <input/Input.h>
25 #include <nativehelper/ScopedPrimitiveArray.h>
26 #include <nativehelper/ScopedUtfChars.h>
27 #include <utils/Log.h>
28 #include <optional>
29 #include "android_view_KeyEvent.h"
30
31 #include "core_jni_helpers.h"
32
33 namespace android {
34
35 /**
36 * Convert an std::array of bytes into a Java object.
37 */
38 template <size_t N>
toJbyteArray(JNIEnv * env,const std::array<uint8_t,N> & data)39 static ScopedLocalRef<jbyteArray> toJbyteArray(JNIEnv* env, const std::array<uint8_t, N>& data) {
40 ScopedLocalRef<jbyteArray> array(env, env->NewByteArray(N));
41 if (array.get() == nullptr) {
42 jniThrowException(env, "java/lang/OutOfMemoryError", nullptr);
43 return array;
44 }
45 static_assert(sizeof(char) == sizeof(uint8_t));
46 env->SetByteArrayRegion(array.get(), 0, N, reinterpret_cast<const signed char*>(data.data()));
47 return array;
48 }
49
50 /**
51 * Convert a Java object into an std::array of bytes of size N.
52 * If the object is null, or the length is unexpected, return std::nullopt.
53 */
54 template <size_t N>
fromJobject(JNIEnv * env,jobject object)55 static std::optional<std::array<uint8_t, N>> fromJobject(JNIEnv* env, jobject object) {
56 if (object == nullptr) {
57 return std::nullopt;
58 }
59 jbyteArray javaArray = reinterpret_cast<jbyteArray>(object);
60 ScopedByteArrayRO bytes(env, javaArray);
61 if (bytes.size() != N) {
62 ALOGE("Could not initialize array from java object, expected length %zu but got %zu", N,
63 bytes.size());
64 return std::nullopt;
65 }
66 std::array<uint8_t, N> array;
67 std::move(bytes.get(), bytes.get() + N, array.begin());
68 return array;
69 }
70
71 // ----------------------------------------------------------------------------
72
73 static struct {
74 jclass clazz;
75
76 jmethodID obtain;
77 jmethodID recycle;
78
79 jfieldID mId;
80 jfieldID mDeviceId;
81 jfieldID mSource;
82 jfieldID mDisplayId;
83 jfieldID mHmac;
84 jfieldID mMetaState;
85 jfieldID mAction;
86 jfieldID mKeyCode;
87 jfieldID mScanCode;
88 jfieldID mRepeatCount;
89 jfieldID mFlags;
90 jfieldID mDownTime;
91 jfieldID mEventTime;
92 jfieldID mCharacters;
93 } gKeyEventClassInfo;
94
95 // ----------------------------------------------------------------------------
96
android_view_KeyEvent_fromNative(JNIEnv * env,const KeyEvent * event)97 jobject android_view_KeyEvent_fromNative(JNIEnv* env, const KeyEvent* event) {
98 ScopedLocalRef<jbyteArray> hmac = toJbyteArray(env, event->getHmac());
99 jobject eventObj =
100 env->CallStaticObjectMethod(gKeyEventClassInfo.clazz, gKeyEventClassInfo.obtain,
101 event->getId(),
102 nanoseconds_to_milliseconds(event->getDownTime()),
103 nanoseconds_to_milliseconds(event->getEventTime()),
104 event->getAction(), event->getKeyCode(),
105 event->getRepeatCount(), event->getMetaState(),
106 event->getDeviceId(), event->getScanCode(),
107 event->getFlags(), event->getSource(),
108 event->getDisplayId(), hmac.get(), nullptr);
109 if (env->ExceptionCheck()) {
110 ALOGE("An exception occurred while obtaining a key event.");
111 LOGE_EX(env);
112 env->ExceptionClear();
113 return NULL;
114 }
115 return eventObj;
116 }
117
android_view_KeyEvent_toNative(JNIEnv * env,jobject eventObj,KeyEvent * event)118 status_t android_view_KeyEvent_toNative(JNIEnv* env, jobject eventObj,
119 KeyEvent* event) {
120 jint id = env->GetIntField(eventObj, gKeyEventClassInfo.mId);
121 jint deviceId = env->GetIntField(eventObj, gKeyEventClassInfo.mDeviceId);
122 jint source = env->GetIntField(eventObj, gKeyEventClassInfo.mSource);
123 jint displayId = env->GetIntField(eventObj, gKeyEventClassInfo.mDisplayId);
124 jobject hmacObj = env->GetObjectField(eventObj, gKeyEventClassInfo.mHmac);
125 std::optional<std::array<uint8_t, 32>> hmac = fromJobject<32>(env, hmacObj);
126 if (!hmac) {
127 hmac = INVALID_HMAC;
128 }
129 jint metaState = env->GetIntField(eventObj, gKeyEventClassInfo.mMetaState);
130 jint action = env->GetIntField(eventObj, gKeyEventClassInfo.mAction);
131 jint keyCode = env->GetIntField(eventObj, gKeyEventClassInfo.mKeyCode);
132 jint scanCode = env->GetIntField(eventObj, gKeyEventClassInfo.mScanCode);
133 jint repeatCount = env->GetIntField(eventObj, gKeyEventClassInfo.mRepeatCount);
134 jint flags = env->GetIntField(eventObj, gKeyEventClassInfo.mFlags);
135 jlong downTime = env->GetLongField(eventObj, gKeyEventClassInfo.mDownTime);
136 jlong eventTime = env->GetLongField(eventObj, gKeyEventClassInfo.mEventTime);
137
138 event->initialize(id, deviceId, source, displayId, *hmac, action, flags, keyCode, scanCode,
139 metaState, repeatCount, milliseconds_to_nanoseconds(downTime),
140 milliseconds_to_nanoseconds(eventTime));
141 return OK;
142 }
143
android_view_KeyEvent_recycle(JNIEnv * env,jobject eventObj)144 status_t android_view_KeyEvent_recycle(JNIEnv* env, jobject eventObj) {
145 env->CallVoidMethod(eventObj, gKeyEventClassInfo.recycle);
146 if (env->ExceptionCheck()) {
147 ALOGW("An exception occurred while recycling a key event.");
148 LOGW_EX(env);
149 env->ExceptionClear();
150 return UNKNOWN_ERROR;
151 }
152 return OK;
153 }
154
android_view_KeyEvent_nativeKeyCodeToString(JNIEnv * env,jobject clazz,jint keyCode)155 static jstring android_view_KeyEvent_nativeKeyCodeToString(JNIEnv* env, jobject clazz,
156 jint keyCode) {
157 return env->NewStringUTF(KeyEvent::getLabel(keyCode));
158 }
159
android_view_KeyEvent_nativeKeyCodeFromString(JNIEnv * env,jobject clazz,jstring label)160 static jint android_view_KeyEvent_nativeKeyCodeFromString(JNIEnv* env, jobject clazz,
161 jstring label) {
162 ScopedUtfChars keyLabel(env, label);
163 return KeyEvent::getKeyCodeFromLabel(keyLabel.c_str());
164 }
165
android_view_KeyEvent_nativeNextId()166 static jint android_view_KeyEvent_nativeNextId() {
167 return static_cast<jint>(InputEvent::nextId());
168 }
169
170 // ----------------------------------------------------------------------------
171
172 static const JNINativeMethod g_methods[] = {
173 {"nativeKeyCodeToString", "(I)Ljava/lang/String;",
174 (void*)android_view_KeyEvent_nativeKeyCodeToString},
175 {"nativeKeyCodeFromString", "(Ljava/lang/String;)I",
176 (void*)android_view_KeyEvent_nativeKeyCodeFromString},
177 {"nativeNextId", "()I", (void*)android_view_KeyEvent_nativeNextId},
178 };
179
register_android_view_KeyEvent(JNIEnv * env)180 int register_android_view_KeyEvent(JNIEnv* env) {
181 jclass clazz = FindClassOrDie(env, "android/view/KeyEvent");
182 gKeyEventClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
183
184 gKeyEventClassInfo.obtain =
185 GetStaticMethodIDOrDie(env, gKeyEventClassInfo.clazz, "obtain",
186 "(IJJIIIIIIIII[BLjava/lang/String;)Landroid/view/KeyEvent;");
187 gKeyEventClassInfo.recycle = GetMethodIDOrDie(env, gKeyEventClassInfo.clazz,
188 "recycle", "()V");
189
190 gKeyEventClassInfo.mId = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mId", "I");
191 gKeyEventClassInfo.mDeviceId = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mDeviceId", "I");
192 gKeyEventClassInfo.mSource = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mSource", "I");
193 gKeyEventClassInfo.mDisplayId = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mDisplayId",
194 "I");
195 gKeyEventClassInfo.mHmac = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mHmac", "[B");
196 gKeyEventClassInfo.mMetaState = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mMetaState",
197 "I");
198 gKeyEventClassInfo.mAction = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mAction", "I");
199 gKeyEventClassInfo.mKeyCode = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mKeyCode", "I");
200 gKeyEventClassInfo.mScanCode = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mScanCode", "I");
201 gKeyEventClassInfo.mRepeatCount = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mRepeatCount",
202 "I");
203 gKeyEventClassInfo.mFlags = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mFlags", "I");
204 gKeyEventClassInfo.mDownTime = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mDownTime", "J");
205 gKeyEventClassInfo.mEventTime = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mEventTime",
206 "J");
207 gKeyEventClassInfo.mCharacters = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mCharacters",
208 "Ljava/lang/String;");
209
210 return RegisterMethodsOrDie(env, "android/view/KeyEvent", g_methods, NELEM(g_methods));
211 }
212
213 } // namespace android
214