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 "InputChannel-JNI"
18
19 #include <nativehelper/JNIHelp.h>
20
21 #include <android_runtime/AndroidRuntime.h>
22 #include <binder/Parcel.h>
23 #include <utils/Log.h>
24 #include <input/InputTransport.h>
25 #include "android_view_InputChannel.h"
26 #include "android_os_Parcel.h"
27 #include "android_util_Binder.h"
28
29 #include "core_jni_helpers.h"
30
31 namespace android {
32
33 // ----------------------------------------------------------------------------
34
35 static struct {
36 jclass clazz;
37
38 jfieldID mPtr; // native object attached to the DVM InputChannel
39 jmethodID ctor;
40 } gInputChannelClassInfo;
41
42 // ----------------------------------------------------------------------------
43
44 class NativeInputChannel {
45 public:
46 explicit NativeInputChannel(const sp<InputChannel>& inputChannel);
47 ~NativeInputChannel();
48
getInputChannel()49 inline sp<InputChannel> getInputChannel() { return mInputChannel; }
50
51 void setDisposeCallback(InputChannelObjDisposeCallback callback, void* data);
52 void invokeAndRemoveDisposeCallback(JNIEnv* env, jobject obj);
53
54 private:
55 sp<InputChannel> mInputChannel;
56 InputChannelObjDisposeCallback mDisposeCallback;
57 void* mDisposeData;
58 };
59
60 // ----------------------------------------------------------------------------
61
NativeInputChannel(const sp<InputChannel> & inputChannel)62 NativeInputChannel::NativeInputChannel(const sp<InputChannel>& inputChannel) :
63 mInputChannel(inputChannel), mDisposeCallback(NULL) {
64 }
65
~NativeInputChannel()66 NativeInputChannel::~NativeInputChannel() {
67 }
68
setDisposeCallback(InputChannelObjDisposeCallback callback,void * data)69 void NativeInputChannel::setDisposeCallback(InputChannelObjDisposeCallback callback, void* data) {
70 mDisposeCallback = callback;
71 mDisposeData = data;
72 }
73
invokeAndRemoveDisposeCallback(JNIEnv * env,jobject obj)74 void NativeInputChannel::invokeAndRemoveDisposeCallback(JNIEnv* env, jobject obj) {
75 if (mDisposeCallback) {
76 mDisposeCallback(env, obj, mInputChannel, mDisposeData);
77 mDisposeCallback = NULL;
78 mDisposeData = NULL;
79 }
80 }
81
82 // ----------------------------------------------------------------------------
83
android_view_InputChannel_getNativeInputChannel(JNIEnv * env,jobject inputChannelObj)84 static NativeInputChannel* android_view_InputChannel_getNativeInputChannel(JNIEnv* env,
85 jobject inputChannelObj) {
86 jlong longPtr = env->GetLongField(inputChannelObj, gInputChannelClassInfo.mPtr);
87 return reinterpret_cast<NativeInputChannel*>(longPtr);
88 }
89
android_view_InputChannel_setNativeInputChannel(JNIEnv * env,jobject inputChannelObj,NativeInputChannel * nativeInputChannel)90 static void android_view_InputChannel_setNativeInputChannel(JNIEnv* env, jobject inputChannelObj,
91 NativeInputChannel* nativeInputChannel) {
92 env->SetLongField(inputChannelObj, gInputChannelClassInfo.mPtr,
93 reinterpret_cast<jlong>(nativeInputChannel));
94 }
95
android_view_InputChannel_getInputChannel(JNIEnv * env,jobject inputChannelObj)96 sp<InputChannel> android_view_InputChannel_getInputChannel(JNIEnv* env, jobject inputChannelObj) {
97 NativeInputChannel* nativeInputChannel =
98 android_view_InputChannel_getNativeInputChannel(env, inputChannelObj);
99 return nativeInputChannel != NULL ? nativeInputChannel->getInputChannel() : NULL;
100 }
101
android_view_InputChannel_setDisposeCallback(JNIEnv * env,jobject inputChannelObj,InputChannelObjDisposeCallback callback,void * data)102 void android_view_InputChannel_setDisposeCallback(JNIEnv* env, jobject inputChannelObj,
103 InputChannelObjDisposeCallback callback, void* data) {
104 NativeInputChannel* nativeInputChannel =
105 android_view_InputChannel_getNativeInputChannel(env, inputChannelObj);
106 if (nativeInputChannel == NULL) {
107 ALOGW("Cannot set dispose callback because input channel object has not been initialized.");
108 } else {
109 nativeInputChannel->setDisposeCallback(callback, data);
110 }
111 }
112
android_view_InputChannel_createInputChannel(JNIEnv * env,std::unique_ptr<NativeInputChannel> nativeInputChannel)113 static jobject android_view_InputChannel_createInputChannel(JNIEnv* env,
114 std::unique_ptr<NativeInputChannel> nativeInputChannel) {
115 jobject inputChannelObj = env->NewObject(gInputChannelClassInfo.clazz,
116 gInputChannelClassInfo.ctor);
117 if (inputChannelObj) {
118 android_view_InputChannel_setNativeInputChannel(env, inputChannelObj,
119 nativeInputChannel.release());
120 }
121 return inputChannelObj;
122 }
123
android_view_InputChannel_nativeOpenInputChannelPair(JNIEnv * env,jclass clazz,jstring nameObj)124 static jobjectArray android_view_InputChannel_nativeOpenInputChannelPair(JNIEnv* env,
125 jclass clazz, jstring nameObj) {
126 const char* nameChars = env->GetStringUTFChars(nameObj, NULL);
127 String8 name(nameChars);
128 env->ReleaseStringUTFChars(nameObj, nameChars);
129
130 sp<InputChannel> serverChannel;
131 sp<InputChannel> clientChannel;
132 status_t result = InputChannel::openInputChannelPair(name, serverChannel, clientChannel);
133
134 if (result) {
135 String8 message;
136 message.appendFormat("Could not open input channel pair. status=%d", result);
137 jniThrowRuntimeException(env, message.string());
138 return NULL;
139 }
140
141 jobjectArray channelPair = env->NewObjectArray(2, gInputChannelClassInfo.clazz, NULL);
142 if (env->ExceptionCheck()) {
143 return NULL;
144 }
145
146 jobject serverChannelObj = android_view_InputChannel_createInputChannel(env,
147 std::make_unique<NativeInputChannel>(serverChannel));
148 if (env->ExceptionCheck()) {
149 return NULL;
150 }
151
152 jobject clientChannelObj = android_view_InputChannel_createInputChannel(env,
153 std::make_unique<NativeInputChannel>(clientChannel));
154 if (env->ExceptionCheck()) {
155 return NULL;
156 }
157
158 env->SetObjectArrayElement(channelPair, 0, serverChannelObj);
159 env->SetObjectArrayElement(channelPair, 1, clientChannelObj);
160 return channelPair;
161 }
162
android_view_InputChannel_nativeDispose(JNIEnv * env,jobject obj,jboolean finalized)163 static void android_view_InputChannel_nativeDispose(JNIEnv* env, jobject obj, jboolean finalized) {
164 NativeInputChannel* nativeInputChannel =
165 android_view_InputChannel_getNativeInputChannel(env, obj);
166 if (nativeInputChannel) {
167 if (finalized) {
168 ALOGW("Input channel object '%s' was finalized without being disposed!",
169 nativeInputChannel->getInputChannel()->getName().string());
170 }
171
172 nativeInputChannel->invokeAndRemoveDisposeCallback(env, obj);
173
174 android_view_InputChannel_setNativeInputChannel(env, obj, NULL);
175 delete nativeInputChannel;
176 }
177 }
178
android_view_InputChannel_nativeTransferTo(JNIEnv * env,jobject obj,jobject otherObj)179 static void android_view_InputChannel_nativeTransferTo(JNIEnv* env, jobject obj,
180 jobject otherObj) {
181 if (android_view_InputChannel_getNativeInputChannel(env, otherObj) != NULL) {
182 jniThrowException(env, "java/lang/IllegalStateException",
183 "Other object already has a native input channel.");
184 return;
185 }
186
187 NativeInputChannel* nativeInputChannel =
188 android_view_InputChannel_getNativeInputChannel(env, obj);
189 android_view_InputChannel_setNativeInputChannel(env, otherObj, nativeInputChannel);
190 android_view_InputChannel_setNativeInputChannel(env, obj, NULL);
191 }
192
android_view_InputChannel_nativeReadFromParcel(JNIEnv * env,jobject obj,jobject parcelObj)193 static void android_view_InputChannel_nativeReadFromParcel(JNIEnv* env, jobject obj,
194 jobject parcelObj) {
195 if (android_view_InputChannel_getNativeInputChannel(env, obj) != NULL) {
196 jniThrowException(env, "java/lang/IllegalStateException",
197 "This object already has a native input channel.");
198 return;
199 }
200
201 Parcel* parcel = parcelForJavaObject(env, parcelObj);
202 if (parcel) {
203 bool isInitialized = parcel->readInt32();
204 if (isInitialized) {
205 String8 name = parcel->readString8();
206 int rawFd = parcel->readFileDescriptor();
207 int dupFd = dup(rawFd);
208 if (dupFd < 0) {
209 ALOGE("Error %d dup channel fd %d.", errno, rawFd);
210 jniThrowRuntimeException(env,
211 "Could not read input channel file descriptors from parcel.");
212 return;
213 }
214
215 InputChannel* inputChannel = new InputChannel(name, dupFd);
216 NativeInputChannel* nativeInputChannel = new NativeInputChannel(inputChannel);
217
218 android_view_InputChannel_setNativeInputChannel(env, obj, nativeInputChannel);
219 }
220 }
221 }
222
android_view_InputChannel_nativeWriteToParcel(JNIEnv * env,jobject obj,jobject parcelObj)223 static void android_view_InputChannel_nativeWriteToParcel(JNIEnv* env, jobject obj,
224 jobject parcelObj) {
225 Parcel* parcel = parcelForJavaObject(env, parcelObj);
226 if (parcel) {
227 NativeInputChannel* nativeInputChannel =
228 android_view_InputChannel_getNativeInputChannel(env, obj);
229 if (nativeInputChannel) {
230 sp<InputChannel> inputChannel = nativeInputChannel->getInputChannel();
231
232 parcel->writeInt32(1);
233 parcel->writeString8(inputChannel->getName());
234 parcel->writeDupFileDescriptor(inputChannel->getFd());
235 } else {
236 parcel->writeInt32(0);
237 }
238 }
239 }
240
android_view_InputChannel_nativeGetName(JNIEnv * env,jobject obj)241 static jstring android_view_InputChannel_nativeGetName(JNIEnv* env, jobject obj) {
242 NativeInputChannel* nativeInputChannel =
243 android_view_InputChannel_getNativeInputChannel(env, obj);
244 if (! nativeInputChannel) {
245 return NULL;
246 }
247
248 jstring name = env->NewStringUTF(nativeInputChannel->getInputChannel()->getName().string());
249 return name;
250 }
251
android_view_InputChannel_nativeDup(JNIEnv * env,jobject obj,jobject otherObj)252 static void android_view_InputChannel_nativeDup(JNIEnv* env, jobject obj, jobject otherObj) {
253 NativeInputChannel* nativeInputChannel =
254 android_view_InputChannel_getNativeInputChannel(env, obj);
255 if (nativeInputChannel) {
256 android_view_InputChannel_setNativeInputChannel(env, otherObj,
257 new NativeInputChannel(nativeInputChannel->getInputChannel()->dup()));
258 }
259 }
260
261 // ----------------------------------------------------------------------------
262
263 static const JNINativeMethod gInputChannelMethods[] = {
264 /* name, signature, funcPtr */
265 { "nativeOpenInputChannelPair", "(Ljava/lang/String;)[Landroid/view/InputChannel;",
266 (void*)android_view_InputChannel_nativeOpenInputChannelPair },
267 { "nativeDispose", "(Z)V",
268 (void*)android_view_InputChannel_nativeDispose },
269 { "nativeTransferTo", "(Landroid/view/InputChannel;)V",
270 (void*)android_view_InputChannel_nativeTransferTo },
271 { "nativeReadFromParcel", "(Landroid/os/Parcel;)V",
272 (void*)android_view_InputChannel_nativeReadFromParcel },
273 { "nativeWriteToParcel", "(Landroid/os/Parcel;)V",
274 (void*)android_view_InputChannel_nativeWriteToParcel },
275 { "nativeGetName", "()Ljava/lang/String;",
276 (void*)android_view_InputChannel_nativeGetName },
277 { "nativeDup", "(Landroid/view/InputChannel;)V",
278 (void*)android_view_InputChannel_nativeDup },
279 };
280
register_android_view_InputChannel(JNIEnv * env)281 int register_android_view_InputChannel(JNIEnv* env) {
282 int res = RegisterMethodsOrDie(env, "android/view/InputChannel", gInputChannelMethods,
283 NELEM(gInputChannelMethods));
284
285 jclass clazz = FindClassOrDie(env, "android/view/InputChannel");
286 gInputChannelClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
287
288 gInputChannelClassInfo.mPtr = GetFieldIDOrDie(env, gInputChannelClassInfo.clazz, "mPtr", "J");
289
290 gInputChannelClassInfo.ctor = GetMethodIDOrDie(env, gInputChannelClassInfo.clazz, "<init>",
291 "()V");
292
293 return res;
294 }
295
296 } // namespace android
297