NfcJniUtil.cpp revision 3f999f25917b2bc50ab78c7e073da18f6fa69d6b 
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#include <nativehelper/JNIHelp.h>
23#include <nativehelper/ScopedLocalRef.h>
24#include "RoutingManager.h"
25#include "_OverrideLog.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*******************************************************************************/
38jint JNI_OnLoad(JavaVM* jvm, void*) {
39  DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s: enter", __func__);
40  JNIEnv* e = NULL;
41
42  LOG(INFO) << StringPrintf("NFC Service: loading nci JNI");
43
44  // Check JNI version
45  if (jvm->GetEnv((void**)&e, JNI_VERSION_1_6)) return JNI_ERR;
46
47  if (android::register_com_android_nfc_NativeNfcManager(e) == -1)
48    return JNI_ERR;
49  if (android::register_com_android_nfc_NativeLlcpServiceSocket(e) == -1)
50    return JNI_ERR;
51  if (android::register_com_android_nfc_NativeLlcpSocket(e) == -1)
52    return JNI_ERR;
53  if (android::register_com_android_nfc_NativeNfcTag(e) == -1) 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 (RoutingManager::getInstance().registerJniFunctions(e) == -1)
59    return JNI_ERR;
60  DLOG_IF(INFO, nfc_debug_enabled) << StringPrintf("%s: exit", __func__);
61  return JNI_VERSION_1_6;
62}
63
64namespace android {
65
66/*******************************************************************************
67**
68** Function:        nfc_jni_cache_object
69**
70** Description:
71**
72** Returns:         Status code.
73**
74*******************************************************************************/
75int nfc_jni_cache_object(JNIEnv* e, const char* className, jobject* cachedObj) {
76  ScopedLocalRef<jclass> cls(e, e->FindClass(className));
77  if (cls.get() == NULL) {
78    LOG(ERROR) << StringPrintf("%s: find class error", __func__);
79    return -1;
80  }
81
82  jmethodID ctor = e->GetMethodID(cls.get(), "<init>", "()V");
83  ScopedLocalRef<jobject> obj(e, e->NewObject(cls.get(), ctor));
84  if (obj.get() == NULL) {
85    LOG(ERROR) << StringPrintf("%s: create object error", __func__);
86    return -1;
87  }
88
89  *cachedObj = e->NewGlobalRef(obj.get());
90  if (*cachedObj == NULL) {
91    LOG(ERROR) << StringPrintf("%s: global ref error", __func__);
92    return -1;
93  }
94  return 0;
95}
96
97/*******************************************************************************
98**
99** Function:        nfc_jni_get_nfc_socket_handle
100**
101** Description:     Get the value of "mHandle" member variable.
102**                  e: JVM environment.
103**                  o: Java object.
104**
105** Returns:         Value of mHandle.
106**
107*******************************************************************************/
108int nfc_jni_get_nfc_socket_handle(JNIEnv* e, jobject o) {
109  ScopedLocalRef<jclass> c(e, e->GetObjectClass(o));
110  jfieldID f = e->GetFieldID(c.get(), "mHandle", "I");
111  return e->GetIntField(o, f);
112}
113
114/*******************************************************************************
115**
116** Function:        nfc_jni_get_nat
117**
118** Description:     Get the value of "mNative" member variable.
119**                  e: JVM environment.
120**                  o: Java object.
121**
122** Returns:         Pointer to the value of mNative.
123**
124*******************************************************************************/
125struct nfc_jni_native_data* nfc_jni_get_nat(JNIEnv* e, jobject o) {
126  ScopedLocalRef<jclass> c(e, e->GetObjectClass(o));
127  jfieldID f = e->GetFieldID(c.get(), "mNative", "J");
128  /* Retrieve native structure address */
129  return (struct nfc_jni_native_data*)e->GetLongField(o, f);
130}
131
132/*******************************************************************************
133**
134** Function         nfc_jni_cache_object_local
135**
136** Description      Allocates a java object and calls it's constructor
137**
138** Returns          -1 on failure, 0 on success
139**
140*******************************************************************************/
141int nfc_jni_cache_object_local(JNIEnv* e, const char* className,
142                               jobject* cachedObj) {
143  ScopedLocalRef<jclass> cls(e, e->FindClass(className));
144  if (cls.get() == NULL) {
145    LOG(ERROR) << StringPrintf("%s: find class error", __func__);
146    return -1;
147  }
148
149  jmethodID ctor = e->GetMethodID(cls.get(), "<init>", "()V");
150  jobject obj = e->NewObject(cls.get(), ctor);
151  if (obj == NULL) {
152    LOG(ERROR) << StringPrintf("%s: create object error", __func__);
153    return -1;
154  }
155
156  *cachedObj = obj;
157  if (*cachedObj == NULL) {
158    LOG(ERROR) << StringPrintf("%s: global ref error", __func__);
159    return -1;
160  }
161  return 0;
162}
163
164}  // namespace android
165