android_backup_FileBackupHelperBase.cpp revision a3804cf77f0edd93f6247a055cdafb856b117eec 
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 int
29ctor(JNIEnv* env, jobject clazz)
30{
31    return (int)new RestoreHelperBase();
32}
33
34static void
35dtor(JNIEnv* env, jobject clazz, jint ptr)
36{
37    delete (RestoreHelperBase*)ptr;
38}
39
40static int
41performBackup_native(JNIEnv* env, jobject clazz, jobject oldState, int data,
42        jobject newState, jobjectArray files, jobjectArray keys)
43{
44    int err;
45
46    // all parameters have already been checked against null
47    int oldStateFD = oldState != NULL ? jniGetFDFromFileDescriptor(env, oldState) : -1;
48    int newStateFD = jniGetFDFromFileDescriptor(env, newState);
49    BackupDataWriter* dataStream = (BackupDataWriter*)data;
50
51    const int fileCount = env->GetArrayLength(files);
52    char const** filesUTF = (char const**)malloc(sizeof(char*)*fileCount);
53    for (int i=0; i<fileCount; i++) {
54        filesUTF[i] = env->GetStringUTFChars((jstring)env->GetObjectArrayElement(files, i), NULL);
55    }
56
57    const int keyCount = env->GetArrayLength(keys);
58    char const** keysUTF = (char const**)malloc(sizeof(char*)*keyCount);
59    for (int i=0; i<keyCount; i++) {
60        keysUTF[i] = env->GetStringUTFChars((jstring)env->GetObjectArrayElement(keys, i), NULL);
61    }
62
63    err = back_up_files(oldStateFD, dataStream, newStateFD, filesUTF, keysUTF, fileCount);
64
65    for (int i=0; i<fileCount; i++) {
66        env->ReleaseStringUTFChars((jstring)env->GetObjectArrayElement(files, i), filesUTF[i]);
67    }
68    free(filesUTF);
69
70    for (int i=0; i<keyCount; i++) {
71        env->ReleaseStringUTFChars((jstring)env->GetObjectArrayElement(keys, i), keysUTF[i]);
72    }
73    free(keysUTF);
74
75    return err;
76}
77
78
79static int
80writeFile_native(JNIEnv* env, jobject clazz, jint ptr, jstring filenameObj, int backupReaderPtr)
81{
82    int err;
83    RestoreHelperBase* restore = (RestoreHelperBase*)ptr;
84    BackupDataReader* reader = (BackupDataReader*)backupReaderPtr;
85    char const* filename;
86
87    filename = env->GetStringUTFChars(filenameObj, NULL);
88
89    err = restore->WriteFile(String8(filename), reader);
90
91    env->ReleaseStringUTFChars(filenameObj, filename);
92
93    return err;
94}
95
96static int
97writeSnapshot_native(JNIEnv* env, jobject clazz, jint ptr, jobject fileDescriptor)
98{
99    int err;
100
101    RestoreHelperBase* restore = (RestoreHelperBase*)ptr;
102    int fd = jniGetFDFromFileDescriptor(env, fileDescriptor);
103
104    err = restore->WriteSnapshot(fd);
105
106    return err;
107}
108
109static const JNINativeMethod g_methods[] = {
110    { "ctor", "()I", (void*)ctor },
111    { "dtor", "(I)V", (void*)dtor },
112    { "performBackup_native",
113       "(Ljava/io/FileDescriptor;ILjava/io/FileDescriptor;[Ljava/lang/String;[Ljava/lang/String;)I",
114       (void*)performBackup_native },
115    { "writeFile_native", "(ILjava/lang/String;I)I", (void*)writeFile_native },
116    { "writeSnapshot_native", "(ILjava/io/FileDescriptor;)I", (void*)writeSnapshot_native },
117};
118
119int register_android_backup_FileBackupHelperBase(JNIEnv* env)
120{
121    return AndroidRuntime::registerNativeMethods(env, "android/app/backup/FileBackupHelperBase",
122            g_methods, NELEM(g_methods));
123}
124
125}
126