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 <nativehelper/JNIHelp.h>
21 #include <android_runtime/AndroidRuntime.h>
22
23 #include <androidfw/BackupHelpers.h>
24
25 #include "core_jni_helpers.h"
26
27 namespace android
28 {
29
30 // android.app.backup.BackupDataInput$EntityHeader
31 static jfieldID s_keyField = 0;
32 static jfieldID s_dataSizeField = 0;
33
34 static jlong
ctor_native(JNIEnv * env,jobject clazz,jobject fileDescriptor)35 ctor_native(JNIEnv* env, jobject clazz, jobject fileDescriptor)
36 {
37 int fd = jniGetFDFromFileDescriptor(env, fileDescriptor);
38 if (fd == -1) {
39 return (jlong)NULL;
40 }
41
42 return (jlong)new BackupDataReader(fd);
43 }
44
45 static void
dtor_native(JNIEnv * env,jobject clazz,jlong r)46 dtor_native(JNIEnv* env, jobject clazz, jlong r)
47 {
48 delete (BackupDataReader*)r;
49 }
50
51 static jint
readNextHeader_native(JNIEnv * env,jobject clazz,jlong r,jobject entity)52 readNextHeader_native(JNIEnv* env, jobject clazz, jlong r, jobject entity)
53 {
54 int err;
55 bool done;
56 BackupDataReader* reader = (BackupDataReader*)r;
57
58 int type = 0;
59
60 err = reader->ReadNextHeader(&done, &type);
61 if (done) {
62 return 1;
63 }
64
65 if (err != 0) {
66 return err < 0 ? err : -1;
67 }
68
69 switch (type) {
70 case BACKUP_HEADER_ENTITY_V1:
71 {
72 String8 key;
73 size_t dataSize;
74 err = reader->ReadEntityHeader(&key, &dataSize);
75 if (err != 0) {
76 return err < 0 ? err : -1;
77 }
78 // TODO: Set the fields in the entity object
79 jstring keyStr = env->NewStringUTF(key.string());
80 env->SetObjectField(entity, s_keyField, keyStr);
81 env->SetIntField(entity, s_dataSizeField, dataSize);
82 return 0;
83 }
84 default:
85 ALOGD("Unknown header type: 0x%08x\n", type);
86 return -1;
87 }
88
89 // done
90 return 1;
91 }
92
93 static jint
readEntityData_native(JNIEnv * env,jobject clazz,jlong r,jbyteArray data,jint offset,jint size)94 readEntityData_native(JNIEnv* env, jobject clazz, jlong r, jbyteArray data, jint offset, jint size)
95 {
96 int err;
97 BackupDataReader* reader = (BackupDataReader*)r;
98
99 if (env->GetArrayLength(data) < (size+offset)) {
100 // size mismatch
101 return -1;
102 }
103
104 jbyte* dataBytes = env->GetByteArrayElements(data, NULL);
105 if (dataBytes == NULL) {
106 return -2;
107 }
108
109 err = reader->ReadEntityData(dataBytes+offset, size);
110
111 env->ReleaseByteArrayElements(data, dataBytes, 0);
112
113 return err;
114 }
115
116 static jint
skipEntityData_native(JNIEnv * env,jobject clazz,jlong r)117 skipEntityData_native(JNIEnv* env, jobject clazz, jlong r)
118 {
119 int err;
120 BackupDataReader* reader = (BackupDataReader*)r;
121
122 err = reader->SkipEntityData();
123
124 return err;
125 }
126
127 static const JNINativeMethod g_methods[] = {
128 { "ctor", "(Ljava/io/FileDescriptor;)J", (void*)ctor_native },
129 { "dtor", "(J)V", (void*)dtor_native },
130 { "readNextHeader_native", "(JLandroid/app/backup/BackupDataInput$EntityHeader;)I",
131 (void*)readNextHeader_native },
132 { "readEntityData_native", "(J[BII)I", (void*)readEntityData_native },
133 { "skipEntityData_native", "(J)I", (void*)skipEntityData_native },
134 };
135
register_android_backup_BackupDataInput(JNIEnv * env)136 int register_android_backup_BackupDataInput(JNIEnv* env)
137 {
138 //ALOGD("register_android_backup_BackupDataInput");
139
140 jclass clazz = FindClassOrDie(env, "android/app/backup/BackupDataInput$EntityHeader");
141 s_keyField = GetFieldIDOrDie(env, clazz, "key", "Ljava/lang/String;");
142 s_dataSizeField = GetFieldIDOrDie(env, clazz, "dataSize", "I");
143
144 return RegisterMethodsOrDie(env, "android/app/backup/BackupDataInput", g_methods,
145 NELEM(g_methods));
146 }
147
148 }
149