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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 "JNIHelp.h"
     21 #include <android_runtime/AndroidRuntime.h>
     22 
     23 #include <utils/BackupHelpers.h>
     24 
     25 namespace android
     26 {
     27 
     28 static jfieldID s_descriptorField = 0;
     29 
     30 static int
     31 ctor_native(JNIEnv* env, jobject clazz, jobject fileDescriptor)
     32 {
     33     int err;
     34 
     35     int fd = env->GetIntField(fileDescriptor, s_descriptorField);
     36     if (fd == -1) {
     37         return NULL;
     38     }
     39 
     40     return (int)new BackupDataWriter(fd);
     41 }
     42 
     43 static void
     44 dtor_native(JNIEnv* env, jobject clazz, int w)
     45 {
     46     delete (BackupDataWriter*)w;
     47 }
     48 
     49 static jint
     50 writeEntityHeader_native(JNIEnv* env, jobject clazz, int w, jstring key, int dataSize)
     51 {
     52     int err;
     53     BackupDataWriter* writer = (BackupDataWriter*)w;
     54 
     55     const char* keyUTF = env->GetStringUTFChars(key, NULL);
     56     if (keyUTF == NULL) {
     57         return -1;
     58     }
     59 
     60     err = writer->WriteEntityHeader(String8(keyUTF), dataSize);
     61 
     62     env->ReleaseStringUTFChars(key, keyUTF);
     63 
     64     return err;
     65 }
     66 
     67 static jint
     68 writeEntityData_native(JNIEnv* env, jobject clazz, int w, jbyteArray data, int size)
     69 {
     70     int err;
     71     BackupDataWriter* writer = (BackupDataWriter*)w;
     72 
     73     if (env->GetArrayLength(data) < size) {
     74         // size mismatch
     75         return -1;
     76     }
     77 
     78     jbyte* dataBytes = env->GetByteArrayElements(data, NULL);
     79     if (dataBytes == NULL) {
     80         return -1;
     81     }
     82 
     83     err = writer->WriteEntityData(dataBytes, size);
     84 
     85     env->ReleaseByteArrayElements(data, dataBytes, JNI_ABORT);
     86 
     87     return err;
     88 }
     89 
     90 static void
     91 setKeyPrefix_native(JNIEnv* env, jobject clazz, int w, jstring keyPrefixObj)
     92 {
     93     int err;
     94     BackupDataWriter* writer = (BackupDataWriter*)w;
     95 
     96     const char* keyPrefixUTF = env->GetStringUTFChars(keyPrefixObj, NULL);
     97     String8 keyPrefix(keyPrefixUTF ? keyPrefixUTF : "");
     98 
     99     writer->SetKeyPrefix(keyPrefix);
    100 
    101     env->ReleaseStringUTFChars(keyPrefixObj, keyPrefixUTF);
    102 }
    103 
    104 static const JNINativeMethod g_methods[] = {
    105     { "ctor", "(Ljava/io/FileDescriptor;)I", (void*)ctor_native },
    106     { "dtor", "(I)V", (void*)dtor_native },
    107     { "writeEntityHeader_native", "(ILjava/lang/String;I)I", (void*)writeEntityHeader_native },
    108     { "writeEntityData_native", "(I[BI)I", (void*)writeEntityData_native },
    109     { "setKeyPrefix_native", "(ILjava/lang/String;)V", (void*)setKeyPrefix_native },
    110 };
    111 
    112 int register_android_backup_BackupDataOutput(JNIEnv* env)
    113 {
    114     //LOGD("register_android_backup_BackupDataOutput");
    115 
    116     jclass clazz;
    117 
    118     clazz = env->FindClass("java/io/FileDescriptor");
    119     LOG_FATAL_IF(clazz == NULL, "Unable to find class java.io.FileDescriptor");
    120     s_descriptorField = env->GetFieldID(clazz, "descriptor", "I");
    121     LOG_FATAL_IF(s_descriptorField == NULL,
    122             "Unable to find descriptor field in java.io.FileDescriptor");
    123 
    124     return AndroidRuntime::registerNativeMethods(env, "android/app/backup/BackupDataOutput",
    125             g_methods, NELEM(g_methods));
    126 }
    127 
    128 }
    129