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
25 namespace android
26 {
27
28 // java.io.FileDescriptor
29 static jfieldID s_descriptorField = 0;
30
31 static int
ctor(JNIEnv * env,jobject clazz)32 ctor(JNIEnv* env, jobject clazz)
33 {
34 return (int)new RestoreHelperBase();
35 }
36
37 static void
dtor(JNIEnv * env,jobject clazz,jint ptr)38 dtor(JNIEnv* env, jobject clazz, jint ptr)
39 {
40 delete (RestoreHelperBase*)ptr;
41 }
42
43 static int
performBackup_native(JNIEnv * env,jobject clazz,jobject oldState,int data,jobject newState,jobjectArray files,jobjectArray keys)44 performBackup_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
82 static int
writeFile_native(JNIEnv * env,jobject clazz,jint ptr,jstring filenameObj,int backupReaderPtr)83 writeFile_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
99 static int
writeSnapshot_native(JNIEnv * env,jobject clazz,jint ptr,jobject fileDescriptor)100 writeSnapshot_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
112 static 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
register_android_backup_FileBackupHelperBase(JNIEnv * env)122 int 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