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#include "core_jni_helpers.h"
26
27namespace android
28{
29
30// android.app.backup.BackupDataInput$EntityHeader
31static jfieldID s_keyField = 0;
32static jfieldID s_dataSizeField = 0;
33
34static jlong
35ctor_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
45static void
46dtor_native(JNIEnv* env, jobject clazz, jlong r)
47{
48    delete (BackupDataReader*)r;
49}
50
51static jint
52readNextHeader_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
93static jint
94readEntityData_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
116static jint
117skipEntityData_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
127static 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
136int 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