com_android_defcontainer_MeasurementUtils.cpp revision 6215d3ff4b5dfa52a5d8b9a42e343051f31066a5 
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 "DefContainer-JNI"
18
19#include <JNIHelp.h>
20
21#include <diskusage/dirsize.h>
22#include <utils/Log.h>
23
24#include <sys/types.h>
25#include <sys/stat.h>
26#include <errno.h>
27#include <fcntl.h>
28#include <string.h>
29
30namespace android {
31
32static jlong native_measureDirectory(JNIEnv* env, jobject clazz, jstring directory) {
33    jlong ret = 0L;
34
35    const char* path = env->GetStringUTFChars(directory, NULL);
36    if (path == NULL) {
37        return ret;
38    }
39
40    int dirfd = open(path, O_DIRECTORY, O_RDONLY);
41    if (dirfd < 0) {
42        ALOGI("error opening: %s: %s", path, strerror(errno));
43    } else {
44        ret = calculate_dir_size(dirfd);
45        close(dirfd);
46    }
47
48    env->ReleaseStringUTFChars(directory, path);
49
50    return ret;
51}
52
53static const JNINativeMethod g_methods[] = {
54    { "native_measureDirectory", "(Ljava/lang/String;)J", (void*)native_measureDirectory },
55};
56
57int register_com_android_defcontainer(JNIEnv *env) {
58    if (jniRegisterNativeMethods(
59            env, "com/android/defcontainer/MeasurementUtils", g_methods, NELEM(g_methods)) < 0) {
60        return JNI_ERR;
61    }
62
63    return JNI_VERSION_1_6;
64}
65
66} // namespace android
67
68int JNI_OnLoad(JavaVM *jvm, void* reserved) {
69    JNIEnv *env;
70
71    if (jvm->GetEnv((void**)&env, JNI_VERSION_1_6)) {
72        return JNI_ERR;
73    }
74
75    return android::register_com_android_defcontainer(env);
76}
77