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      1 /*
      2  * Copyright (C) 2012 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 #include "NfcJniUtil.h"
     17 
     18 #include <cutils/log.h>
     19 #include <errno.h>
     20 #include <JNIHelp.h>
     21 #include <ScopedLocalRef.h>
     22 
     23 
     24 /*******************************************************************************
     25 **
     26 ** Function:        JNI_OnLoad
     27 **
     28 ** Description:     Register all JNI functions with Java Virtual Machine.
     29 **                  jvm: Java Virtual Machine.
     30 **                  reserved: Not used.
     31 **
     32 ** Returns:         JNI version.
     33 **
     34 *******************************************************************************/
     35 jint JNI_OnLoad (JavaVM* jvm, void*)
     36 {
     37     ALOGD ("%s: enter", __FUNCTION__);
     38     JNIEnv *e = NULL;
     39 
     40     ALOGI("NFC Service: loading nci JNI");
     41 
     42     // Check JNI version
     43     if (jvm->GetEnv ((void **) &e, JNI_VERSION_1_6))
     44         return JNI_ERR;
     45 
     46     if (android::register_com_android_nfc_NativeNfcManager (e) == -1)
     47         return JNI_ERR;
     48     if (android::register_com_android_nfc_NativeLlcpServiceSocket (e) == -1)
     49         return JNI_ERR;
     50     if (android::register_com_android_nfc_NativeLlcpSocket (e) == -1)
     51         return JNI_ERR;
     52     if (android::register_com_android_nfc_NativeNfcTag (e) == -1)
     53         return JNI_ERR;
     54     if (android::register_com_android_nfc_NativeLlcpConnectionlessSocket (e) == -1)
     55         return JNI_ERR;
     56     if (android::register_com_android_nfc_NativeP2pDevice (e) == -1)
     57         return JNI_ERR;
     58     if (android::register_com_android_nfc_NativeNfcSecureElement (e) == -1)
     59         return JNI_ERR;
     60     ALOGD ("%s: exit", __FUNCTION__);
     61     return JNI_VERSION_1_6;
     62 }
     63 
     64 
     65 namespace android
     66 {
     67 
     68 
     69 /*******************************************************************************
     70 **
     71 ** Function:        nfc_jni_cache_object
     72 **
     73 ** Description:
     74 **
     75 ** Returns:         Status code.
     76 **
     77 *******************************************************************************/
     78 int nfc_jni_cache_object (JNIEnv *e, const char *className, jobject *cachedObj)
     79 {
     80     ScopedLocalRef<jclass> cls(e, e->FindClass(className));
     81     if (cls.get() == NULL)
     82     {
     83         ALOGE("%s: find class error", __FUNCTION__);
     84         return -1;
     85     }
     86 
     87     jmethodID ctor = e->GetMethodID(cls.get(), "<init>", "()V");
     88     ScopedLocalRef<jobject> obj(e, e->NewObject(cls.get(), ctor));
     89     if (obj.get() == NULL)
     90     {
     91        ALOGE("%s: create object error", __FUNCTION__);
     92        return -1;
     93     }
     94 
     95     *cachedObj = e->NewGlobalRef(obj.get());
     96     if (*cachedObj == NULL)
     97     {
     98         ALOGE("%s: global ref error", __FUNCTION__);
     99         return -1;
    100     }
    101     return 0;
    102 }
    103 
    104 
    105 /*******************************************************************************
    106 **
    107 ** Function:        nfc_jni_get_nfc_socket_handle
    108 **
    109 ** Description:     Get the value of "mHandle" member variable.
    110 **                  e: JVM environment.
    111 **                  o: Java object.
    112 **
    113 ** Returns:         Value of mHandle.
    114 **
    115 *******************************************************************************/
    116 int nfc_jni_get_nfc_socket_handle (JNIEnv *e, jobject o)
    117 {
    118     ScopedLocalRef<jclass> c(e, e->GetObjectClass(o));
    119     jfieldID f = e->GetFieldID(c.get(), "mHandle", "I");
    120     return e->GetIntField(o, f);
    121 }
    122 
    123 
    124 /*******************************************************************************
    125 **
    126 ** Function:        nfc_jni_get_nat
    127 **
    128 ** Description:     Get the value of "mNative" member variable.
    129 **                  e: JVM environment.
    130 **                  o: Java object.
    131 **
    132 ** Returns:         Pointer to the value of mNative.
    133 **
    134 *******************************************************************************/
    135 struct nfc_jni_native_data* nfc_jni_get_nat(JNIEnv *e, jobject o)
    136 {
    137    ScopedLocalRef<jclass> c(e, e->GetObjectClass(o));
    138    jfieldID f = e->GetFieldID(c.get(), "mNative", "I");
    139    /* Retrieve native structure address */
    140    return (struct nfc_jni_native_data*) e->GetIntField(o, f);
    141 }
    142 
    143 
    144 } // namespace android
    145