android_backup_BackupDataOutput.cpp revision 8ae2335a3c93d0c00e998fdec18f64dfe43b94cb 
1/*
2 * Copyright (C) 2009 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 "FileBackupHelper_native"
18#include <utils/Log.h>
19
20#include "JNIHelp.h"
21#include <android_runtime/AndroidRuntime.h>
22
23#include <utils/BackupHelpers.h>
24
25namespace android
26{
27
28static jfieldID s_descriptorField = 0;
29
30static int
31ctor_native(JNIEnv* env, jobject This, jobject fileDescriptor)
32{
33    int err;
34
35    int fd = env->GetIntField(fileDescriptor, s_descriptorField);
36    if (fd == -1) {
37        return NULL;
38    }
39
40    return (int)new BackupDataWriter(fd);
41}
42
43static void
44dtor_native(JNIEnv* env, jobject This, int fd)
45{
46    delete (BackupDataWriter*)fd;
47}
48
49static const JNINativeMethod g_methods[] = {
50    { "ctor", "(Ljava/io/FileDescriptor;)I", (void*)ctor_native },
51    { "dtor", "(I)V", (void*)dtor_native },
52};
53
54int register_android_backup_BackupDataOutput(JNIEnv* env)
55{
56    LOGD("register_android_backup_BackupDataOutput");
57
58    jclass clazz;
59
60    clazz = env->FindClass("java/io/FileDescriptor");
61    LOG_FATAL_IF(clazz == NULL, "Unable to find class java.io.FileDescriptor");
62    s_descriptorField = env->GetFieldID(clazz, "descriptor", "I");
63    LOG_FATAL_IF(s_descriptorField == NULL,
64            "Unable to find descriptor field in java.io.FileDescriptor");
65
66    return AndroidRuntime::registerNativeMethods(env, "android/backup/BackupDataOutput",
67            g_methods, NELEM(g_methods));
68}
69
70}
71