media/jni/android_mtp_MtpServer.cpp

   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 "MtpServerJNI"
  18 #include "utils/Log.h"
  19
  20 #include <stdio.h>
  21 #include <assert.h>
  22 #include <limits.h>
  23 #include <unistd.h>
  24 #include <fcntl.h>
  25 #include <utils/threads.h>
  26
  27 #include "jni.h"
  28 #include "JNIHelp.h"
  29 #include "android_runtime/AndroidRuntime.h"
  30 #include "private/android_filesystem_config.h"
  31
  32 #include "MtpServer.h"
  33 #include "MtpStorage.h"
  34
  35 using namespace android;
  36
  37 // MtpServer fields
  38 static jfieldID field_MtpServer_nativeContext;
  39
  40 // MtpStorage fields
  41 static jfieldID field_MtpStorage_storageId;
  42 static jfieldID field_MtpStorage_path;
  43 static jfieldID field_MtpStorage_description;
  44 static jfieldID field_MtpStorage_reserveSpace;
  45 static jfieldID field_MtpStorage_removable;
  46 static jfieldID field_MtpStorage_maxFileSize;
  47
  48 static Mutex sMutex;
  49
  50 // ----------------------------------------------------------------------------
  51
  52 // in android_mtp_MtpDatabase.cpp
  53 extern MtpDatabase* getMtpDatabase(JNIEnv *env, jobject database);
  54
  55 static inline MtpServer* getMtpServer(JNIEnv *env, jobject thiz) {
  56     return (MtpServer*)env->GetLongField(thiz, field_MtpServer_nativeContext);
  57 }
  58
  59 static void
  60 android_mtp_MtpServer_setup(JNIEnv *env, jobject thiz, jobject javaDatabase, jboolean usePtp)
  61 {
  62     int fd = open("/dev/mtp_usb", O_RDWR);
  63     if (fd >= 0) {
  64         MtpServer* server = new MtpServer(fd, getMtpDatabase(env, javaDatabase),
  65                 usePtp, AID_MEDIA_RW, 0664, 0775);
  66         env->SetLongField(thiz, field_MtpServer_nativeContext, (jlong)server);
  67     } else {
  68         ALOGE("could not open MTP driver, errno: %d", errno);
  69     }
  70 }
  71
  72 static void
  73 android_mtp_MtpServer_run(JNIEnv *env, jobject thiz)
  74 {
  75     MtpServer* server = getMtpServer(env, thiz);
  76     if (server)
  77         server->run();
  78     else
  79         ALOGE("server is null in run");
  80 }
  81
  82 static void
  83 android_mtp_MtpServer_cleanup(JNIEnv *env, jobject thiz)
  84 {
  85     Mutex::Autolock autoLock(sMutex);
  86
  87     MtpServer* server = getMtpServer(env, thiz);
  88     if (server) {
  89         delete server;
  90         env->SetLongField(thiz, field_MtpServer_nativeContext, 0);
  91     } else {
  92         ALOGE("server is null in cleanup");
  93     }
  94 }
  95
  96 static void
  97 android_mtp_MtpServer_send_object_added(JNIEnv *env, jobject thiz, jint handle)
  98 {
  99     Mutex::Autolock autoLock(sMutex);
 100
 101     MtpServer* server = getMtpServer(env, thiz);
 102     if (server)
 103         server->sendObjectAdded(handle);
 104     else
 105         ALOGE("server is null in send_object_added");
 106 }
 107
 108 static void
 109 android_mtp_MtpServer_send_object_removed(JNIEnv *env, jobject thiz, jint handle)
 110 {
 111     Mutex::Autolock autoLock(sMutex);
 112
 113     MtpServer* server = getMtpServer(env, thiz);
 114     if (server)
 115         server->sendObjectRemoved(handle);
 116     else
 117         ALOGE("server is null in send_object_removed");
 118 }
 119
 120 static void
 121 android_mtp_MtpServer_send_device_property_changed(JNIEnv *env, jobject thiz, jint property)
 122 {
 123     Mutex::Autolock autoLock(sMutex);
 124
 125     MtpServer* server = getMtpServer(env, thiz);
 126     if (server)
 127         server->sendDevicePropertyChanged(property);
 128     else
 129         ALOGE("server is null in send_object_removed");
 130 }
 131
 132 static void
 133 android_mtp_MtpServer_add_storage(JNIEnv *env, jobject thiz, jobject jstorage)
 134 {
 135     Mutex::Autolock autoLock(sMutex);
 136
 137     MtpServer* server = getMtpServer(env, thiz);
 138     if (server) {
 139         jint storageID = env->GetIntField(jstorage, field_MtpStorage_storageId);
 140         jstring path = (jstring)env->GetObjectField(jstorage, field_MtpStorage_path);
 141         jstring description = (jstring)env->GetObjectField(jstorage, field_MtpStorage_description);
 142         jlong reserveSpace = env->GetLongField(jstorage, field_MtpStorage_reserveSpace);
 143         jboolean removable = env->GetBooleanField(jstorage, field_MtpStorage_removable);
 144         jlong maxFileSize = env->GetLongField(jstorage, field_MtpStorage_maxFileSize);
 145
 146         const char *pathStr = env->GetStringUTFChars(path, NULL);
 147         if (pathStr != NULL) {
 148             const char *descriptionStr = env->GetStringUTFChars(description, NULL);
 149             if (descriptionStr != NULL) {
 150                 MtpStorage* storage = new MtpStorage(storageID, pathStr, descriptionStr,
 151                         reserveSpace, removable, maxFileSize);
 152                 server->addStorage(storage);
 153                 env->ReleaseStringUTFChars(path, pathStr);
 154                 env->ReleaseStringUTFChars(description, descriptionStr);
 155             } else {
 156                 env->ReleaseStringUTFChars(path, pathStr);
 157             }
 158         }
 159     } else {
 160         ALOGE("server is null in add_storage");
 161     }
 162 }
 163
 164 static void
 165 android_mtp_MtpServer_remove_storage(JNIEnv *env, jobject thiz, jint storageId)
 166 {
 167     Mutex::Autolock autoLock(sMutex);
 168
 169     MtpServer* server = getMtpServer(env, thiz);
 170     if (server) {
 171         MtpStorage* storage = server->getStorage(storageId);
 172         if (storage) {
 173             server->removeStorage(storage);
 174             delete storage;
 175         }
 176     } else
 177         ALOGE("server is null in remove_storage");
 178 }
 179
 180 // ----------------------------------------------------------------------------
 181
 182 static JNINativeMethod gMethods[] = {
 183     {"native_setup",                "(Landroid/mtp/MtpDatabase;Z)V",
 184                                             (void *)android_mtp_MtpServer_setup},
 185     {"native_run",                  "()V",  (void *)android_mtp_MtpServer_run},
 186     {"native_cleanup",              "()V",  (void *)android_mtp_MtpServer_cleanup},
 187     {"native_send_object_added",    "(I)V", (void *)android_mtp_MtpServer_send_object_added},
 188     {"native_send_object_removed",  "(I)V", (void *)android_mtp_MtpServer_send_object_removed},
 189     {"native_send_device_property_changed",  "(I)V",
 190                                     (void *)android_mtp_MtpServer_send_device_property_changed},
 191     {"native_add_storage",          "(Landroid/mtp/MtpStorage;)V",
 192                                             (void *)android_mtp_MtpServer_add_storage},
 193     {"native_remove_storage",       "(I)V", (void *)android_mtp_MtpServer_remove_storage},
 194 };
 195
 196 int register_android_mtp_MtpServer(JNIEnv *env)
 197 {
 198     jclass clazz;
 199
 200     clazz = env->FindClass("android/mtp/MtpStorage");
 201     if (clazz == NULL) {
 202         ALOGE("Can't find android/mtp/MtpStorage");
 203         return -1;
 204     }
 205     field_MtpStorage_storageId = env->GetFieldID(clazz, "mStorageId", "I");
 206     if (field_MtpStorage_storageId == NULL) {
 207         ALOGE("Can't find MtpStorage.mStorageId");
 208         return -1;
 209     }
 210     field_MtpStorage_path = env->GetFieldID(clazz, "mPath", "Ljava/lang/String;");
 211     if (field_MtpStorage_path == NULL) {
 212         ALOGE("Can't find MtpStorage.mPath");
 213         return -1;
 214     }
 215     field_MtpStorage_description = env->GetFieldID(clazz, "mDescription", "Ljava/lang/String;");
 216     if (field_MtpStorage_description == NULL) {
 217         ALOGE("Can't find MtpStorage.mDescription");
 218         return -1;
 219     }
 220     field_MtpStorage_reserveSpace = env->GetFieldID(clazz, "mReserveSpace", "J");
 221     if (field_MtpStorage_reserveSpace == NULL) {
 222         ALOGE("Can't find MtpStorage.mReserveSpace");
 223         return -1;
 224     }
 225     field_MtpStorage_removable = env->GetFieldID(clazz, "mRemovable", "Z");
 226     if (field_MtpStorage_removable == NULL) {
 227         ALOGE("Can't find MtpStorage.mRemovable");
 228         return -1;
 229     }
 230     field_MtpStorage_maxFileSize = env->GetFieldID(clazz, "mMaxFileSize", "J");
 231     if (field_MtpStorage_maxFileSize == NULL) {
 232         ALOGE("Can't find MtpStorage.mMaxFileSize");
 233         return -1;
 234     }
 235
 236     clazz = env->FindClass("android/mtp/MtpServer");
 237     if (clazz == NULL) {
 238         ALOGE("Can't find android/mtp/MtpServer");
 239         return -1;
 240     }
 241     field_MtpServer_nativeContext = env->GetFieldID(clazz, "mNativeContext", "J");
 242     if (field_MtpServer_nativeContext == NULL) {
 243         ALOGE("Can't find MtpServer.mNativeContext");
 244         return -1;
 245     }
 246
 247     return AndroidRuntime::registerNativeMethods(env,
 248                 "android/mtp/MtpServer", gMethods, NELEM(gMethods));
 249 }