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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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.
*/
#define LOG_TAG "KeyEvent-JNI"
#include <nativehelper/JNIHelp.h>
#include <android_runtime/AndroidRuntime.h>
#include <android_runtime/Log.h>
#include <attestation/HmacKeyManager.h>
#include <input/Input.h>
#include <nativehelper/ScopedPrimitiveArray.h>
#include <nativehelper/ScopedUtfChars.h>
#include <utils/Log.h>
#include <optional>
#include "android_view_KeyEvent.h"
#include "core_jni_helpers.h"
namespace android {
/**
* Convert an std::array of bytes into a Java object.
*/
template <size_t N>
static ScopedLocalRef<jbyteArray> toJbyteArray(JNIEnv* env, const std::array<uint8_t, N>& data) {
ScopedLocalRef<jbyteArray> array(env, env->NewByteArray(N));
if (array.get() == nullptr) {
jniThrowException(env, "java/lang/OutOfMemoryError", nullptr);
return array;
}
static_assert(sizeof(char) == sizeof(uint8_t));
env->SetByteArrayRegion(array.get(), 0, N, reinterpret_cast<const signed char*>(data.data()));
return array;
}
/**
* Convert a Java object into an std::array of bytes of size N.
* If the object is null, or the length is unexpected, return std::nullopt.
*/
template <size_t N>
static std::optional<std::array<uint8_t, N>> fromJobject(JNIEnv* env, jobject object) {
if (object == nullptr) {
return std::nullopt;
}
jbyteArray javaArray = reinterpret_cast<jbyteArray>(object);
ScopedByteArrayRO bytes(env, javaArray);
if (bytes.size() != N) {
ALOGE("Could not initialize array from java object, expected length %zu but got %zu", N,
bytes.size());
return std::nullopt;
}
std::array<uint8_t, N> array;
std::move(bytes.get(), bytes.get() + N, array.begin());
return array;
}
// ----------------------------------------------------------------------------
static struct {
jclass clazz;
jmethodID obtain;
jmethodID recycle;
jfieldID mId;
jfieldID mDeviceId;
jfieldID mSource;
jfieldID mDisplayId;
jfieldID mHmac;
jfieldID mMetaState;
jfieldID mAction;
jfieldID mKeyCode;
jfieldID mScanCode;
jfieldID mRepeatCount;
jfieldID mFlags;
jfieldID mDownTime;
jfieldID mEventTime;
jfieldID mCharacters;
} gKeyEventClassInfo;
// ----------------------------------------------------------------------------
jobject android_view_KeyEvent_fromNative(JNIEnv* env, const KeyEvent* event) {
ScopedLocalRef<jbyteArray> hmac = toJbyteArray(env, event->getHmac());
jobject eventObj =
env->CallStaticObjectMethod(gKeyEventClassInfo.clazz, gKeyEventClassInfo.obtain,
event->getId(),
nanoseconds_to_milliseconds(event->getDownTime()),
nanoseconds_to_milliseconds(event->getEventTime()),
event->getAction(), event->getKeyCode(),
event->getRepeatCount(), event->getMetaState(),
event->getDeviceId(), event->getScanCode(),
event->getFlags(), event->getSource(),
event->getDisplayId(), hmac.get(), nullptr);
if (env->ExceptionCheck()) {
ALOGE("An exception occurred while obtaining a key event.");
LOGE_EX(env);
env->ExceptionClear();
return NULL;
}
return eventObj;
}
status_t android_view_KeyEvent_toNative(JNIEnv* env, jobject eventObj,
KeyEvent* event) {
jint id = env->GetIntField(eventObj, gKeyEventClassInfo.mId);
jint deviceId = env->GetIntField(eventObj, gKeyEventClassInfo.mDeviceId);
jint source = env->GetIntField(eventObj, gKeyEventClassInfo.mSource);
jint displayId = env->GetIntField(eventObj, gKeyEventClassInfo.mDisplayId);
jobject hmacObj = env->GetObjectField(eventObj, gKeyEventClassInfo.mHmac);
std::optional<std::array<uint8_t, 32>> hmac = fromJobject<32>(env, hmacObj);
if (!hmac) {
hmac = INVALID_HMAC;
}
jint metaState = env->GetIntField(eventObj, gKeyEventClassInfo.mMetaState);
jint action = env->GetIntField(eventObj, gKeyEventClassInfo.mAction);
jint keyCode = env->GetIntField(eventObj, gKeyEventClassInfo.mKeyCode);
jint scanCode = env->GetIntField(eventObj, gKeyEventClassInfo.mScanCode);
jint repeatCount = env->GetIntField(eventObj, gKeyEventClassInfo.mRepeatCount);
jint flags = env->GetIntField(eventObj, gKeyEventClassInfo.mFlags);
jlong downTime = env->GetLongField(eventObj, gKeyEventClassInfo.mDownTime);
jlong eventTime = env->GetLongField(eventObj, gKeyEventClassInfo.mEventTime);
event->initialize(id, deviceId, source, displayId, *hmac, action, flags, keyCode, scanCode,
metaState, repeatCount, milliseconds_to_nanoseconds(downTime),
milliseconds_to_nanoseconds(eventTime));
return OK;
}
status_t android_view_KeyEvent_recycle(JNIEnv* env, jobject eventObj) {
env->CallVoidMethod(eventObj, gKeyEventClassInfo.recycle);
if (env->ExceptionCheck()) {
ALOGW("An exception occurred while recycling a key event.");
LOGW_EX(env);
env->ExceptionClear();
return UNKNOWN_ERROR;
}
return OK;
}
static jstring android_view_KeyEvent_nativeKeyCodeToString(JNIEnv* env, jobject clazz,
jint keyCode) {
return env->NewStringUTF(KeyEvent::getLabel(keyCode));
}
static jint android_view_KeyEvent_nativeKeyCodeFromString(JNIEnv* env, jobject clazz,
jstring label) {
ScopedUtfChars keyLabel(env, label);
return KeyEvent::getKeyCodeFromLabel(keyLabel.c_str());
}
static jint android_view_KeyEvent_nativeNextId() {
return static_cast<jint>(InputEvent::nextId());
}
// ----------------------------------------------------------------------------
static const JNINativeMethod g_methods[] = {
{"nativeKeyCodeToString", "(I)Ljava/lang/String;",
(void*)android_view_KeyEvent_nativeKeyCodeToString},
{"nativeKeyCodeFromString", "(Ljava/lang/String;)I",
(void*)android_view_KeyEvent_nativeKeyCodeFromString},
{"nativeNextId", "()I", (void*)android_view_KeyEvent_nativeNextId},
};
int register_android_view_KeyEvent(JNIEnv* env) {
jclass clazz = FindClassOrDie(env, "android/view/KeyEvent");
gKeyEventClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
gKeyEventClassInfo.obtain =
GetStaticMethodIDOrDie(env, gKeyEventClassInfo.clazz, "obtain",
"(IJJIIIIIIIII[BLjava/lang/String;)Landroid/view/KeyEvent;");
gKeyEventClassInfo.recycle = GetMethodIDOrDie(env, gKeyEventClassInfo.clazz,
"recycle", "()V");
gKeyEventClassInfo.mId = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mId", "I");
gKeyEventClassInfo.mDeviceId = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mDeviceId", "I");
gKeyEventClassInfo.mSource = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mSource", "I");
gKeyEventClassInfo.mDisplayId = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mDisplayId",
"I");
gKeyEventClassInfo.mHmac = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mHmac", "[B");
gKeyEventClassInfo.mMetaState = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mMetaState",
"I");
gKeyEventClassInfo.mAction = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mAction", "I");
gKeyEventClassInfo.mKeyCode = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mKeyCode", "I");
gKeyEventClassInfo.mScanCode = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mScanCode", "I");
gKeyEventClassInfo.mRepeatCount = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mRepeatCount",
"I");
gKeyEventClassInfo.mFlags = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mFlags", "I");
gKeyEventClassInfo.mDownTime = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mDownTime", "J");
gKeyEventClassInfo.mEventTime = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mEventTime",
"J");
gKeyEventClassInfo.mCharacters = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mCharacters",
"Ljava/lang/String;");
return RegisterMethodsOrDie(env, "android/view/KeyEvent", g_methods, NELEM(g_methods));
}
} // namespace android
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