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 namespace android {
30
31 // ----------------------------------------------------------------------------
32
33 static struct {
34 jclass clazz;
35
36 jfieldID mPtr; // native object attached to the DVM InputChannel
37 jmethodID ctor;
38 } gInputChannelClassInfo;
39
40 // ----------------------------------------------------------------------------
41
42 class NativeInputChannel {
43 public:
44 NativeInputChannel(const sp<InputChannel>& inputChannel);
45 ~NativeInputChannel();
46
getInputChannel()47 inline sp<InputChannel> getInputChannel() { return mInputChannel; }
48
49 void setDisposeCallback(InputChannelObjDisposeCallback callback, void* data);
50 void invokeAndRemoveDisposeCallback(JNIEnv* env, jobject obj);
51
52 private:
53 sp<InputChannel> mInputChannel;
54 InputChannelObjDisposeCallback mDisposeCallback;
55 void* mDisposeData;
56 };
57
58 // ----------------------------------------------------------------------------
59
NativeInputChannel(const sp<InputChannel> & inputChannel)60 NativeInputChannel::NativeInputChannel(const sp<InputChannel>& inputChannel) :
61 mInputChannel(inputChannel), mDisposeCallback(NULL) {
62 }
63
~NativeInputChannel()64 NativeInputChannel::~NativeInputChannel() {
65 }
66
setDisposeCallback(InputChannelObjDisposeCallback callback,void * data)67 void NativeInputChannel::setDisposeCallback(InputChannelObjDisposeCallback callback, void* data) {
68 mDisposeCallback = callback;
69 mDisposeData = data;
70 }
71
invokeAndRemoveDisposeCallback(JNIEnv * env,jobject obj)72 void NativeInputChannel::invokeAndRemoveDisposeCallback(JNIEnv* env, jobject obj) {
73 if (mDisposeCallback) {
74 mDisposeCallback(env, obj, mInputChannel, mDisposeData);
75 mDisposeCallback = NULL;
76 mDisposeData = NULL;
77 }
78 }
79
80 // ----------------------------------------------------------------------------
81
android_view_InputChannel_getNativeInputChannel(JNIEnv * env,jobject inputChannelObj)82 static NativeInputChannel* android_view_InputChannel_getNativeInputChannel(JNIEnv* env,
83 jobject inputChannelObj) {
84 jlong longPtr = env->GetLongField(inputChannelObj, gInputChannelClassInfo.mPtr);
85 return reinterpret_cast<NativeInputChannel*>(longPtr);
86 }
87
android_view_InputChannel_setNativeInputChannel(JNIEnv * env,jobject inputChannelObj,NativeInputChannel * nativeInputChannel)88 static void android_view_InputChannel_setNativeInputChannel(JNIEnv* env, jobject inputChannelObj,
89 NativeInputChannel* nativeInputChannel) {
90 env->SetLongField(inputChannelObj, gInputChannelClassInfo.mPtr,
91 reinterpret_cast<jlong>(nativeInputChannel));
92 }
93
android_view_InputChannel_getInputChannel(JNIEnv * env,jobject inputChannelObj)94 sp<InputChannel> android_view_InputChannel_getInputChannel(JNIEnv* env, jobject inputChannelObj) {
95 NativeInputChannel* nativeInputChannel =
96 android_view_InputChannel_getNativeInputChannel(env, inputChannelObj);
97 return nativeInputChannel != NULL ? nativeInputChannel->getInputChannel() : NULL;
98 }
99
android_view_InputChannel_setDisposeCallback(JNIEnv * env,jobject inputChannelObj,InputChannelObjDisposeCallback callback,void * data)100 void android_view_InputChannel_setDisposeCallback(JNIEnv* env, jobject inputChannelObj,
101 InputChannelObjDisposeCallback callback, void* data) {
102 NativeInputChannel* nativeInputChannel =
103 android_view_InputChannel_getNativeInputChannel(env, inputChannelObj);
104 if (nativeInputChannel == NULL) {
105 ALOGW("Cannot set dispose callback because input channel object has not been initialized.");
106 } else {
107 nativeInputChannel->setDisposeCallback(callback, data);
108 }
109 }
110
android_view_InputChannel_createInputChannel(JNIEnv * env,NativeInputChannel * nativeInputChannel)111 static jobject android_view_InputChannel_createInputChannel(JNIEnv* env,
112 NativeInputChannel* nativeInputChannel) {
113 jobject inputChannelObj = env->NewObject(gInputChannelClassInfo.clazz,
114 gInputChannelClassInfo.ctor);
115 if (inputChannelObj) {
116 android_view_InputChannel_setNativeInputChannel(env, inputChannelObj, nativeInputChannel);
117 }
118 return inputChannelObj;
119 }
120
android_view_InputChannel_nativeOpenInputChannelPair(JNIEnv * env,jclass clazz,jstring nameObj)121 static jobjectArray android_view_InputChannel_nativeOpenInputChannelPair(JNIEnv* env,
122 jclass clazz, jstring nameObj) {
123 const char* nameChars = env->GetStringUTFChars(nameObj, NULL);
124 String8 name(nameChars);
125 env->ReleaseStringUTFChars(nameObj, nameChars);
126
127 sp<InputChannel> serverChannel;
128 sp<InputChannel> clientChannel;
129 status_t result = InputChannel::openInputChannelPair(name, serverChannel, clientChannel);
130
131 if (result) {
132 String8 message;
133 message.appendFormat("Could not open input channel pair. status=%d", result);
134 jniThrowRuntimeException(env, message.string());
135 return NULL;
136 }
137
138 jobjectArray channelPair = env->NewObjectArray(2, gInputChannelClassInfo.clazz, NULL);
139 if (env->ExceptionCheck()) {
140 return NULL;
141 }
142
143 jobject serverChannelObj = android_view_InputChannel_createInputChannel(env,
144 new NativeInputChannel(serverChannel));
145 if (env->ExceptionCheck()) {
146 return NULL;
147 }
148
149 jobject clientChannelObj = android_view_InputChannel_createInputChannel(env,
150 new NativeInputChannel(clientChannel));
151 if (env->ExceptionCheck()) {
152 return NULL;
153 }
154
155 env->SetObjectArrayElement(channelPair, 0, serverChannelObj);
156 env->SetObjectArrayElement(channelPair, 1, clientChannelObj);
157 return channelPair;
158 }
159
android_view_InputChannel_nativeDispose(JNIEnv * env,jobject obj,jboolean finalized)160 static void android_view_InputChannel_nativeDispose(JNIEnv* env, jobject obj, jboolean finalized) {
161 NativeInputChannel* nativeInputChannel =
162 android_view_InputChannel_getNativeInputChannel(env, obj);
163 if (nativeInputChannel) {
164 if (finalized) {
165 ALOGW("Input channel object '%s' was finalized without being disposed!",
166 nativeInputChannel->getInputChannel()->getName().string());
167 }
168
169 nativeInputChannel->invokeAndRemoveDisposeCallback(env, obj);
170
171 android_view_InputChannel_setNativeInputChannel(env, obj, NULL);
172 delete nativeInputChannel;
173 }
174 }
175
android_view_InputChannel_nativeTransferTo(JNIEnv * env,jobject obj,jobject otherObj)176 static void android_view_InputChannel_nativeTransferTo(JNIEnv* env, jobject obj,
177 jobject otherObj) {
178 if (android_view_InputChannel_getNativeInputChannel(env, otherObj) != NULL) {
179 jniThrowException(env, "java/lang/IllegalStateException",
180 "Other object already has a native input channel.");
181 return;
182 }
183
184 NativeInputChannel* nativeInputChannel =
185 android_view_InputChannel_getNativeInputChannel(env, obj);
186 android_view_InputChannel_setNativeInputChannel(env, otherObj, nativeInputChannel);
187 android_view_InputChannel_setNativeInputChannel(env, obj, NULL);
188 }
189
android_view_InputChannel_nativeReadFromParcel(JNIEnv * env,jobject obj,jobject parcelObj)190 static void android_view_InputChannel_nativeReadFromParcel(JNIEnv* env, jobject obj,
191 jobject parcelObj) {
192 if (android_view_InputChannel_getNativeInputChannel(env, obj) != NULL) {
193 jniThrowException(env, "java/lang/IllegalStateException",
194 "This object already has a native input channel.");
195 return;
196 }
197
198 Parcel* parcel = parcelForJavaObject(env, parcelObj);
199 if (parcel) {
200 bool isInitialized = parcel->readInt32();
201 if (isInitialized) {
202 String8 name = parcel->readString8();
203 int rawFd = parcel->readFileDescriptor();
204 int dupFd = dup(rawFd);
205 if (dupFd < 0) {
206 ALOGE("Error %d dup channel fd %d.", errno, rawFd);
207 jniThrowRuntimeException(env,
208 "Could not read input channel file descriptors from parcel.");
209 return;
210 }
211
212 InputChannel* inputChannel = new InputChannel(name, dupFd);
213 NativeInputChannel* nativeInputChannel = new NativeInputChannel(inputChannel);
214
215 android_view_InputChannel_setNativeInputChannel(env, obj, nativeInputChannel);
216 }
217 }
218 }
219
android_view_InputChannel_nativeWriteToParcel(JNIEnv * env,jobject obj,jobject parcelObj)220 static void android_view_InputChannel_nativeWriteToParcel(JNIEnv* env, jobject obj,
221 jobject parcelObj) {
222 Parcel* parcel = parcelForJavaObject(env, parcelObj);
223 if (parcel) {
224 NativeInputChannel* nativeInputChannel =
225 android_view_InputChannel_getNativeInputChannel(env, obj);
226 if (nativeInputChannel) {
227 sp<InputChannel> inputChannel = nativeInputChannel->getInputChannel();
228
229 parcel->writeInt32(1);
230 parcel->writeString8(inputChannel->getName());
231 parcel->writeDupFileDescriptor(inputChannel->getFd());
232 } else {
233 parcel->writeInt32(0);
234 }
235 }
236 }
237
android_view_InputChannel_nativeGetName(JNIEnv * env,jobject obj)238 static jstring android_view_InputChannel_nativeGetName(JNIEnv* env, jobject obj) {
239 NativeInputChannel* nativeInputChannel =
240 android_view_InputChannel_getNativeInputChannel(env, obj);
241 if (! nativeInputChannel) {
242 return NULL;
243 }
244
245 jstring name = env->NewStringUTF(nativeInputChannel->getInputChannel()->getName().string());
246 return name;
247 }
248
android_view_InputChannel_nativeDup(JNIEnv * env,jobject obj,jobject otherObj)249 static void android_view_InputChannel_nativeDup(JNIEnv* env, jobject obj, jobject otherObj) {
250 NativeInputChannel* nativeInputChannel =
251 android_view_InputChannel_getNativeInputChannel(env, obj);
252 if (nativeInputChannel) {
253 android_view_InputChannel_setNativeInputChannel(env, otherObj,
254 new NativeInputChannel(nativeInputChannel->getInputChannel()->dup()));
255 }
256 }
257
258 // ----------------------------------------------------------------------------
259
260 static JNINativeMethod gInputChannelMethods[] = {
261 /* name, signature, funcPtr */
262 { "nativeOpenInputChannelPair", "(Ljava/lang/String;)[Landroid/view/InputChannel;",
263 (void*)android_view_InputChannel_nativeOpenInputChannelPair },
264 { "nativeDispose", "(Z)V",
265 (void*)android_view_InputChannel_nativeDispose },
266 { "nativeTransferTo", "(Landroid/view/InputChannel;)V",
267 (void*)android_view_InputChannel_nativeTransferTo },
268 { "nativeReadFromParcel", "(Landroid/os/Parcel;)V",
269 (void*)android_view_InputChannel_nativeReadFromParcel },
270 { "nativeWriteToParcel", "(Landroid/os/Parcel;)V",
271 (void*)android_view_InputChannel_nativeWriteToParcel },
272 { "nativeGetName", "()Ljava/lang/String;",
273 (void*)android_view_InputChannel_nativeGetName },
274 { "nativeDup", "(Landroid/view/InputChannel;)V",
275 (void*)android_view_InputChannel_nativeDup },
276 };
277
278 #define FIND_CLASS(var, className) \
279 var = env->FindClass(className); \
280 LOG_FATAL_IF(! var, "Unable to find class " className); \
281 var = jclass(env->NewGlobalRef(var));
282
283 #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
284 var = env->GetMethodID(clazz, methodName, methodDescriptor); \
285 LOG_FATAL_IF(! var, "Unable to find method " methodName);
286
287 #define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
288 var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
289 LOG_FATAL_IF(! var, "Unable to find field " fieldName);
290
register_android_view_InputChannel(JNIEnv * env)291 int register_android_view_InputChannel(JNIEnv* env) {
292 int res = jniRegisterNativeMethods(env, "android/view/InputChannel",
293 gInputChannelMethods, NELEM(gInputChannelMethods));
294 LOG_FATAL_IF(res < 0, "Unable to register native methods.");
295
296 FIND_CLASS(gInputChannelClassInfo.clazz, "android/view/InputChannel");
297
298 GET_FIELD_ID(gInputChannelClassInfo.mPtr, gInputChannelClassInfo.clazz,
299 "mPtr", "J");
300
301 GET_METHOD_ID(gInputChannelClassInfo.ctor, gInputChannelClassInfo.clazz,
302 "<init>", "()V");
303
304 return 0;
305 }
306
307 } // namespace android
308