android_backup_FileBackupHelperBase.cpp revision 7adc274abd9c0c361b798c2348251358d7adeb18 
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
28// java.io.FileDescriptor
29static jfieldID s_descriptorField = 0;
30
31static int
32ctor(JNIEnv* env, jobject clazz)
33{
34    return (int)new RestoreHelperBase();
35}
36
37static void
38dtor(JNIEnv* env, jobject clazz, jint ptr)
39{
40    delete (RestoreHelperBase*)ptr;
41}
42
43static int
44performBackup_native(JNIEnv* env, jobject clazz, jobject oldState, int data,
45        jobject newState, jobjectArray files, jobjectArray keys)
46{
47    int err;
48
49    // all parameters have already been checked against null
50    int oldStateFD = oldState != NULL ? env->GetIntField(oldState, s_descriptorField) : -1;
51    int newStateFD = env->GetIntField(newState, s_descriptorField);
52    BackupDataWriter* dataStream = (BackupDataWriter*)data;
53
54    const int fileCount = env->GetArrayLength(files);
55    char const** filesUTF = (char const**)malloc(sizeof(char*)*fileCount);
56    for (int i=0; i<fileCount; i++) {
57        filesUTF[i] = env->GetStringUTFChars((jstring)env->GetObjectArrayElement(files, i), NULL);
58    }
59
60    const int keyCount = env->GetArrayLength(keys);
61    char const** keysUTF = (char const**)malloc(sizeof(char*)*keyCount);
62    for (int i=0; i<keyCount; i++) {
63        keysUTF[i] = env->GetStringUTFChars((jstring)env->GetObjectArrayElement(keys, i), NULL);
64    }
65
66    err = back_up_files(oldStateFD, dataStream, newStateFD, filesUTF, keysUTF, fileCount);
67
68    for (int i=0; i<fileCount; i++) {
69        env->ReleaseStringUTFChars((jstring)env->GetObjectArrayElement(files, i), filesUTF[i]);
70    }
71    free(filesUTF);
72
73    for (int i=0; i<keyCount; i++) {
74        env->ReleaseStringUTFChars((jstring)env->GetObjectArrayElement(keys, i), keysUTF[i]);
75    }
76    free(keysUTF);
77
78    return err;
79}
80
81
82static int
83writeFile_native(JNIEnv* env, jobject clazz, jint ptr, jstring filenameObj, int backupReaderPtr)
84{
85    int err;
86    RestoreHelperBase* restore = (RestoreHelperBase*)ptr;
87    BackupDataReader* reader = (BackupDataReader*)backupReaderPtr;
88    char const* filename;
89
90    filename = env->GetStringUTFChars(filenameObj, NULL);
91
92    err = restore->WriteFile(String8(filename), reader);
93
94    env->ReleaseStringUTFChars(filenameObj, filename);
95
96    return err;
97}
98
99static int
100writeSnapshot_native(JNIEnv* env, jobject clazz, jint ptr, jobject fileDescriptor)
101{
102    int err;
103
104    RestoreHelperBase* restore = (RestoreHelperBase*)ptr;
105    int fd = env->GetIntField(fileDescriptor, s_descriptorField);
106
107    err = restore->WriteSnapshot(fd);
108
109    return err;
110}
111
112static const JNINativeMethod g_methods[] = {
113    { "ctor", "()I", (void*)ctor },
114    { "dtor", "(I)V", (void*)dtor },
115    { "performBackup_native",
116       "(Ljava/io/FileDescriptor;ILjava/io/FileDescriptor;[Ljava/lang/String;[Ljava/lang/String;)I",
117       (void*)performBackup_native },
118    { "writeFile_native", "(ILjava/lang/String;I)I", (void*)writeFile_native },
119    { "writeSnapshot_native", "(ILjava/io/FileDescriptor;)I", (void*)writeSnapshot_native },
120};
121
122int register_android_backup_FileBackupHelperBase(JNIEnv* env)
123{
124    jclass clazz;
125
126    clazz = env->FindClass("java/io/FileDescriptor");
127    LOG_FATAL_IF(clazz == NULL, "Unable to find class java.io.FileDescriptor");
128    s_descriptorField = env->GetFieldID(clazz, "descriptor", "I");
129    LOG_FATAL_IF(s_descriptorField == NULL,
130            "Unable to find descriptor field in java.io.FileDescriptor");
131
132    return AndroidRuntime::registerNativeMethods(env, "android/app/backup/FileBackupHelperBase",
133            g_methods, NELEM(g_methods));
134}
135
136}
137