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      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 
     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 
     62 NativeInputChannel::NativeInputChannel(const sp<InputChannel>& inputChannel) :
     63     mInputChannel(inputChannel), mDisposeCallback(NULL) {
     64 }
     65 
     66 NativeInputChannel::~NativeInputChannel() {
     67 }
     68 
     69 void NativeInputChannel::setDisposeCallback(InputChannelObjDisposeCallback callback, void* data) {
     70     mDisposeCallback = callback;
     71     mDisposeData = data;
     72 }
     73 
     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 
     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 
     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 
     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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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