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 "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 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,NativeInputChannel * nativeInputChannel)113 static jobject android_view_InputChannel_createInputChannel(JNIEnv* env,
114 NativeInputChannel* nativeInputChannel) {
115 jobject inputChannelObj = env->NewObject(gInputChannelClassInfo.clazz,
116 gInputChannelClassInfo.ctor);
117 if (inputChannelObj) {
118 android_view_InputChannel_setNativeInputChannel(env, inputChannelObj, nativeInputChannel);
119 }
120 return inputChannelObj;
121 }
122
android_view_InputChannel_nativeOpenInputChannelPair(JNIEnv * env,jclass clazz,jstring nameObj)123 static jobjectArray android_view_InputChannel_nativeOpenInputChannelPair(JNIEnv* env,
124 jclass clazz, jstring nameObj) {
125 const char* nameChars = env->GetStringUTFChars(nameObj, NULL);
126 String8 name(nameChars);
127 env->ReleaseStringUTFChars(nameObj, nameChars);
128
129 sp<InputChannel> serverChannel;
130 sp<InputChannel> clientChannel;
131 status_t result = InputChannel::openInputChannelPair(name, serverChannel, clientChannel);
132
133 if (result) {
134 String8 message;
135 message.appendFormat("Could not open input channel pair. status=%d", result);
136 jniThrowRuntimeException(env, message.string());
137 return NULL;
138 }
139
140 jobjectArray channelPair = env->NewObjectArray(2, gInputChannelClassInfo.clazz, NULL);
141 if (env->ExceptionCheck()) {
142 return NULL;
143 }
144
145 jobject serverChannelObj = android_view_InputChannel_createInputChannel(env,
146 new NativeInputChannel(serverChannel));
147 if (env->ExceptionCheck()) {
148 return NULL;
149 }
150
151 jobject clientChannelObj = android_view_InputChannel_createInputChannel(env,
152 new NativeInputChannel(clientChannel));
153 if (env->ExceptionCheck()) {
154 return NULL;
155 }
156
157 env->SetObjectArrayElement(channelPair, 0, serverChannelObj);
158 env->SetObjectArrayElement(channelPair, 1, clientChannelObj);
159 return channelPair;
160 }
161
android_view_InputChannel_nativeDispose(JNIEnv * env,jobject obj,jboolean finalized)162 static void android_view_InputChannel_nativeDispose(JNIEnv* env, jobject obj, jboolean finalized) {
163 NativeInputChannel* nativeInputChannel =
164 android_view_InputChannel_getNativeInputChannel(env, obj);
165 if (nativeInputChannel) {
166 if (finalized) {
167 ALOGW("Input channel object '%s' was finalized without being disposed!",
168 nativeInputChannel->getInputChannel()->getName().string());
169 }
170
171 nativeInputChannel->invokeAndRemoveDisposeCallback(env, obj);
172
173 android_view_InputChannel_setNativeInputChannel(env, obj, NULL);
174 delete nativeInputChannel;
175 }
176 }
177
android_view_InputChannel_nativeTransferTo(JNIEnv * env,jobject obj,jobject otherObj)178 static void android_view_InputChannel_nativeTransferTo(JNIEnv* env, jobject obj,
179 jobject otherObj) {
180 if (android_view_InputChannel_getNativeInputChannel(env, otherObj) != NULL) {
181 jniThrowException(env, "java/lang/IllegalStateException",
182 "Other object already has a native input channel.");
183 return;
184 }
185
186 NativeInputChannel* nativeInputChannel =
187 android_view_InputChannel_getNativeInputChannel(env, obj);
188 android_view_InputChannel_setNativeInputChannel(env, otherObj, nativeInputChannel);
189 android_view_InputChannel_setNativeInputChannel(env, obj, NULL);
190 }
191
android_view_InputChannel_nativeReadFromParcel(JNIEnv * env,jobject obj,jobject parcelObj)192 static void android_view_InputChannel_nativeReadFromParcel(JNIEnv* env, jobject obj,
193 jobject parcelObj) {
194 if (android_view_InputChannel_getNativeInputChannel(env, obj) != NULL) {
195 jniThrowException(env, "java/lang/IllegalStateException",
196 "This object already has a native input channel.");
197 return;
198 }
199
200 Parcel* parcel = parcelForJavaObject(env, parcelObj);
201 if (parcel) {
202 bool isInitialized = parcel->readInt32();
203 if (isInitialized) {
204 String8 name = parcel->readString8();
205 int rawFd = parcel->readFileDescriptor();
206 int dupFd = dup(rawFd);
207 if (dupFd < 0) {
208 ALOGE("Error %d dup channel fd %d.", errno, rawFd);
209 jniThrowRuntimeException(env,
210 "Could not read input channel file descriptors from parcel.");
211 return;
212 }
213
214 InputChannel* inputChannel = new InputChannel(name, dupFd);
215 NativeInputChannel* nativeInputChannel = new NativeInputChannel(inputChannel);
216
217 android_view_InputChannel_setNativeInputChannel(env, obj, nativeInputChannel);
218 }
219 }
220 }
221
android_view_InputChannel_nativeWriteToParcel(JNIEnv * env,jobject obj,jobject parcelObj)222 static void android_view_InputChannel_nativeWriteToParcel(JNIEnv* env, jobject obj,
223 jobject parcelObj) {
224 Parcel* parcel = parcelForJavaObject(env, parcelObj);
225 if (parcel) {
226 NativeInputChannel* nativeInputChannel =
227 android_view_InputChannel_getNativeInputChannel(env, obj);
228 if (nativeInputChannel) {
229 sp<InputChannel> inputChannel = nativeInputChannel->getInputChannel();
230
231 parcel->writeInt32(1);
232 parcel->writeString8(inputChannel->getName());
233 parcel->writeDupFileDescriptor(inputChannel->getFd());
234 } else {
235 parcel->writeInt32(0);
236 }
237 }
238 }
239
android_view_InputChannel_nativeGetName(JNIEnv * env,jobject obj)240 static jstring android_view_InputChannel_nativeGetName(JNIEnv* env, jobject obj) {
241 NativeInputChannel* nativeInputChannel =
242 android_view_InputChannel_getNativeInputChannel(env, obj);
243 if (! nativeInputChannel) {
244 return NULL;
245 }
246
247 jstring name = env->NewStringUTF(nativeInputChannel->getInputChannel()->getName().string());
248 return name;
249 }
250
android_view_InputChannel_nativeDup(JNIEnv * env,jobject obj,jobject otherObj)251 static void android_view_InputChannel_nativeDup(JNIEnv* env, jobject obj, jobject otherObj) {
252 NativeInputChannel* nativeInputChannel =
253 android_view_InputChannel_getNativeInputChannel(env, obj);
254 if (nativeInputChannel) {
255 android_view_InputChannel_setNativeInputChannel(env, otherObj,
256 new NativeInputChannel(nativeInputChannel->getInputChannel()->dup()));
257 }
258 }
259
260 // ----------------------------------------------------------------------------
261
262 static const JNINativeMethod gInputChannelMethods[] = {
263 /* name, signature, funcPtr */
264 { "nativeOpenInputChannelPair", "(Ljava/lang/String;)[Landroid/view/InputChannel;",
265 (void*)android_view_InputChannel_nativeOpenInputChannelPair },
266 { "nativeDispose", "(Z)V",
267 (void*)android_view_InputChannel_nativeDispose },
268 { "nativeTransferTo", "(Landroid/view/InputChannel;)V",
269 (void*)android_view_InputChannel_nativeTransferTo },
270 { "nativeReadFromParcel", "(Landroid/os/Parcel;)V",
271 (void*)android_view_InputChannel_nativeReadFromParcel },
272 { "nativeWriteToParcel", "(Landroid/os/Parcel;)V",
273 (void*)android_view_InputChannel_nativeWriteToParcel },
274 { "nativeGetName", "()Ljava/lang/String;",
275 (void*)android_view_InputChannel_nativeGetName },
276 { "nativeDup", "(Landroid/view/InputChannel;)V",
277 (void*)android_view_InputChannel_nativeDup },
278 };
279
register_android_view_InputChannel(JNIEnv * env)280 int register_android_view_InputChannel(JNIEnv* env) {
281 int res = RegisterMethodsOrDie(env, "android/view/InputChannel", gInputChannelMethods,
282 NELEM(gInputChannelMethods));
283
284 jclass clazz = FindClassOrDie(env, "android/view/InputChannel");
285 gInputChannelClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
286
287 gInputChannelClassInfo.mPtr = GetFieldIDOrDie(env, gInputChannelClassInfo.clazz, "mPtr", "J");
288
289 gInputChannelClassInfo.ctor = GetMethodIDOrDie(env, gInputChannelClassInfo.clazz, "<init>",
290 "()V");
291
292 return res;
293 }
294
295 } // namespace android
296