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      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
     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
     46 dtor_native(JNIEnv* env, jobject clazz, jlong r)
     47 {
     48     delete (BackupDataReader*)r;
     49 }
     50 
     51 static jint
     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
     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
    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 
    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