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 
17 #include "NfcJniUtil.h"
18 
19 #include <errno.h>
20 
21 #include <log/log.h>
22 
23 #include <JNIHelp.h>
24 #include <ScopedLocalRef.h>
25 #include "RoutingManager.h"
26 
27 /*******************************************************************************
28 **
29 ** Function:        JNI_OnLoad
30 **
31 ** Description:     Register all JNI functions with Java Virtual Machine.
32 **                  jvm: Java Virtual Machine.
33 **                  reserved: Not used.
34 **
35 ** Returns:         JNI version.
36 **
37 *******************************************************************************/
JNI_OnLoad(JavaVM * jvm,void *)38 jint JNI_OnLoad (JavaVM* jvm, void*)
39 {
40     ALOGV("%s: enter", __func__);
41     JNIEnv *e = NULL;
42 
43     ALOGI("NFC Service: loading nci JNI");
44 
45     // Check JNI version
46     if (jvm->GetEnv ((void **) &e, JNI_VERSION_1_6))
47         return JNI_ERR;
48 
49     if (android::register_com_android_nfc_NativeNfcManager (e) == -1)
50         return JNI_ERR;
51     if (android::register_com_android_nfc_NativeLlcpServiceSocket (e) == -1)
52         return JNI_ERR;
53     if (android::register_com_android_nfc_NativeLlcpSocket (e) == -1)
54         return JNI_ERR;
55     if (android::register_com_android_nfc_NativeNfcTag (e) == -1)
56         return JNI_ERR;
57     if (android::register_com_android_nfc_NativeLlcpConnectionlessSocket (e) == -1)
58         return JNI_ERR;
59     if (android::register_com_android_nfc_NativeP2pDevice (e) == -1)
60         return JNI_ERR;
61     if (RoutingManager::getInstance().registerJniFunctions (e) == -1)
62         return JNI_ERR;
63     ALOGV("%s: exit", __func__);
64     return JNI_VERSION_1_6;
65 }
66 
67 
68 namespace android
69 {
70 
71 
72 /*******************************************************************************
73 **
74 ** Function:        nfc_jni_cache_object
75 **
76 ** Description:
77 **
78 ** Returns:         Status code.
79 **
80 *******************************************************************************/
nfc_jni_cache_object(JNIEnv * e,const char * className,jobject * cachedObj)81 int nfc_jni_cache_object (JNIEnv *e, const char *className, jobject *cachedObj)
82 {
83     ScopedLocalRef<jclass> cls(e, e->FindClass(className));
84     if (cls.get() == NULL)
85     {
86         ALOGE("%s: find class error", __func__);
87         return -1;
88     }
89 
90     jmethodID ctor = e->GetMethodID(cls.get(), "<init>", "()V");
91     ScopedLocalRef<jobject> obj(e, e->NewObject(cls.get(), ctor));
92     if (obj.get() == NULL)
93     {
94        ALOGE("%s: create object error", __func__);
95        return -1;
96     }
97 
98     *cachedObj = e->NewGlobalRef(obj.get());
99     if (*cachedObj == NULL)
100     {
101         ALOGE("%s: global ref error", __func__);
102         return -1;
103     }
104     return 0;
105 }
106 
107 
108 /*******************************************************************************
109 **
110 ** Function:        nfc_jni_get_nfc_socket_handle
111 **
112 ** Description:     Get the value of "mHandle" member variable.
113 **                  e: JVM environment.
114 **                  o: Java object.
115 **
116 ** Returns:         Value of mHandle.
117 **
118 *******************************************************************************/
nfc_jni_get_nfc_socket_handle(JNIEnv * e,jobject o)119 int nfc_jni_get_nfc_socket_handle (JNIEnv *e, jobject o)
120 {
121     ScopedLocalRef<jclass> c(e, e->GetObjectClass(o));
122     jfieldID f = e->GetFieldID(c.get(), "mHandle", "I");
123     return e->GetIntField(o, f);
124 }
125 
126 
127 /*******************************************************************************
128 **
129 ** Function:        nfc_jni_get_nat
130 **
131 ** Description:     Get the value of "mNative" member variable.
132 **                  e: JVM environment.
133 **                  o: Java object.
134 **
135 ** Returns:         Pointer to the value of mNative.
136 **
137 *******************************************************************************/
nfc_jni_get_nat(JNIEnv * e,jobject o)138 struct nfc_jni_native_data* nfc_jni_get_nat(JNIEnv *e, jobject o)
139 {
140    ScopedLocalRef<jclass> c(e, e->GetObjectClass(o));
141    jfieldID f = e->GetFieldID(c.get(), "mNative", "J");
142    /* Retrieve native structure address */
143    return (struct nfc_jni_native_data*) e->GetLongField(o, f);
144 }
145 
146 
147 /*******************************************************************************
148 **
149 ** Function         nfc_jni_cache_object_local
150 **
151 ** Description      Allocates a java object and calls it's constructor
152 **
153 ** Returns          -1 on failure, 0 on success
154 **
155 *******************************************************************************/
nfc_jni_cache_object_local(JNIEnv * e,const char * className,jobject * cachedObj)156 int nfc_jni_cache_object_local (JNIEnv *e, const char *className, jobject *cachedObj)
157 {
158     ScopedLocalRef<jclass> cls(e, e->FindClass(className));
159     if(cls.get() == NULL)
160     {
161         ALOGE("%s: find class error", __func__);
162         return -1;
163     }
164 
165     jmethodID ctor = e->GetMethodID(cls.get(), "<init>", "()V");
166     jobject obj = e->NewObject(cls.get(), ctor);
167     if (obj == NULL)
168     {
169        ALOGE("%s: create object error", __func__);
170        return -1;
171     }
172 
173     *cachedObj = obj;
174     if (*cachedObj == NULL)
175     {
176         ALOGE("%s: global ref error", __func__);
177         return -1;
178     }
179     return 0;
180 }
181 
182 
183 } // namespace android
184