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 <androidfw/BackupHelpers.h>
24
25 namespace android
26 {
27
28 // android.app.backup.BackupDataInput$EntityHeader
29 static jfieldID s_keyField = 0;
30 static jfieldID s_dataSizeField = 0;
31
32 static int
ctor_native(JNIEnv * env,jobject clazz,jobject fileDescriptor)33 ctor_native(JNIEnv* env, jobject clazz, jobject fileDescriptor)
34 {
35 int fd = jniGetFDFromFileDescriptor(env, fileDescriptor);
36 if (fd == -1) {
37 return NULL;
38 }
39
40 return (int)new BackupDataReader(fd);
41 }
42
43 static void
dtor_native(JNIEnv * env,jobject clazz,int r)44 dtor_native(JNIEnv* env, jobject clazz, int r)
45 {
46 delete (BackupDataReader*)r;
47 }
48
49 static jint
readNextHeader_native(JNIEnv * env,jobject clazz,int r,jobject entity)50 readNextHeader_native(JNIEnv* env, jobject clazz, int r, jobject entity)
51 {
52 int err;
53 bool done;
54 BackupDataReader* reader = (BackupDataReader*)r;
55
56 int type = 0;
57
58 err = reader->ReadNextHeader(&done, &type);
59 if (done) {
60 return 1;
61 }
62
63 if (err != 0) {
64 return err < 0 ? err : -1;
65 }
66
67 switch (type) {
68 case BACKUP_HEADER_ENTITY_V1:
69 {
70 String8 key;
71 size_t dataSize;
72 err = reader->ReadEntityHeader(&key, &dataSize);
73 if (err != 0) {
74 return err < 0 ? err : -1;
75 }
76 // TODO: Set the fields in the entity object
77 jstring keyStr = env->NewStringUTF(key.string());
78 env->SetObjectField(entity, s_keyField, keyStr);
79 env->SetIntField(entity, s_dataSizeField, dataSize);
80 return 0;
81 }
82 default:
83 ALOGD("Unknown header type: 0x%08x\n", type);
84 return -1;
85 }
86
87 // done
88 return 1;
89 }
90
91 static jint
readEntityData_native(JNIEnv * env,jobject clazz,int r,jbyteArray data,int offset,int size)92 readEntityData_native(JNIEnv* env, jobject clazz, int r, jbyteArray data, int offset, int size)
93 {
94 int err;
95 BackupDataReader* reader = (BackupDataReader*)r;
96
97 if (env->GetArrayLength(data) < (size+offset)) {
98 // size mismatch
99 return -1;
100 }
101
102 jbyte* dataBytes = env->GetByteArrayElements(data, NULL);
103 if (dataBytes == NULL) {
104 return -2;
105 }
106
107 err = reader->ReadEntityData(dataBytes+offset, size);
108
109 env->ReleaseByteArrayElements(data, dataBytes, 0);
110
111 return err;
112 }
113
114 static jint
skipEntityData_native(JNIEnv * env,jobject clazz,int r)115 skipEntityData_native(JNIEnv* env, jobject clazz, int r)
116 {
117 int err;
118 BackupDataReader* reader = (BackupDataReader*)r;
119
120 err = reader->SkipEntityData();
121
122 return err;
123 }
124
125 static const JNINativeMethod g_methods[] = {
126 { "ctor", "(Ljava/io/FileDescriptor;)I", (void*)ctor_native },
127 { "dtor", "(I)V", (void*)dtor_native },
128 { "readNextHeader_native", "(ILandroid/app/backup/BackupDataInput$EntityHeader;)I",
129 (void*)readNextHeader_native },
130 { "readEntityData_native", "(I[BII)I", (void*)readEntityData_native },
131 { "skipEntityData_native", "(I)I", (void*)skipEntityData_native },
132 };
133
register_android_backup_BackupDataInput(JNIEnv * env)134 int register_android_backup_BackupDataInput(JNIEnv* env)
135 {
136 //ALOGD("register_android_backup_BackupDataInput");
137
138 jclass clazz = env->FindClass("android/app/backup/BackupDataInput$EntityHeader");
139 LOG_FATAL_IF(clazz == NULL, "Unable to find class android.app.backup.BackupDataInput.EntityHeader");
140 s_keyField = env->GetFieldID(clazz, "key", "Ljava/lang/String;");
141 LOG_FATAL_IF(s_keyField == NULL,
142 "Unable to find key field in android.app.backup.BackupDataInput.EntityHeader");
143 s_dataSizeField = env->GetFieldID(clazz, "dataSize", "I");
144 LOG_FATAL_IF(s_dataSizeField == NULL,
145 "Unable to find dataSize field in android.app.backup.BackupDataInput.EntityHeader");
146
147 return AndroidRuntime::registerNativeMethods(env, "android/app/backup/BackupDataInput",
148 g_methods, NELEM(g_methods));
149 }
150
151 }
152