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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 int
     29 ctor_native(JNIEnv* env, jobject clazz, jobject fileDescriptor)
     30 {
     31     int fd = jniGetFDFromFileDescriptor(env, fileDescriptor);
     32     if (fd == -1) {
     33         return NULL;
     34     }
     35 
     36     return (int)new BackupDataWriter(fd);
     37 }
     38 
     39 static void
     40 dtor_native(JNIEnv* env, jobject clazz, int w)
     41 {
     42     delete (BackupDataWriter*)w;
     43 }
     44 
     45 static jint
     46 writeEntityHeader_native(JNIEnv* env, jobject clazz, int w, jstring key, int dataSize)
     47 {
     48     int err;
     49     BackupDataWriter* writer = (BackupDataWriter*)w;
     50 
     51     const char* keyUTF = env->GetStringUTFChars(key, NULL);
     52     if (keyUTF == NULL) {
     53         return -1;
     54     }
     55 
     56     err = writer->WriteEntityHeader(String8(keyUTF), dataSize);
     57 
     58     env->ReleaseStringUTFChars(key, keyUTF);
     59 
     60     return err;
     61 }
     62 
     63 static jint
     64 writeEntityData_native(JNIEnv* env, jobject clazz, int w, jbyteArray data, int size)
     65 {
     66     int err;
     67     BackupDataWriter* writer = (BackupDataWriter*)w;
     68 
     69     if (env->GetArrayLength(data) < size) {
     70         // size mismatch
     71         return -1;
     72     }
     73 
     74     jbyte* dataBytes = env->GetByteArrayElements(data, NULL);
     75     if (dataBytes == NULL) {
     76         return -1;
     77     }
     78 
     79     err = writer->WriteEntityData(dataBytes, size);
     80 
     81     env->ReleaseByteArrayElements(data, dataBytes, JNI_ABORT);
     82 
     83     return err;
     84 }
     85 
     86 static void
     87 setKeyPrefix_native(JNIEnv* env, jobject clazz, int w, jstring keyPrefixObj)
     88 {
     89     int err;
     90     BackupDataWriter* writer = (BackupDataWriter*)w;
     91 
     92     const char* keyPrefixUTF = env->GetStringUTFChars(keyPrefixObj, NULL);
     93     String8 keyPrefix(keyPrefixUTF ? keyPrefixUTF : "");
     94 
     95     writer->SetKeyPrefix(keyPrefix);
     96 
     97     env->ReleaseStringUTFChars(keyPrefixObj, keyPrefixUTF);
     98 }
     99 
    100 static const JNINativeMethod g_methods[] = {
    101     { "ctor", "(Ljava/io/FileDescriptor;)I", (void*)ctor_native },
    102     { "dtor", "(I)V", (void*)dtor_native },
    103     { "writeEntityHeader_native", "(ILjava/lang/String;I)I", (void*)writeEntityHeader_native },
    104     { "writeEntityData_native", "(I[BI)I", (void*)writeEntityData_native },
    105     { "setKeyPrefix_native", "(ILjava/lang/String;)V", (void*)setKeyPrefix_native },
    106 };
    107 
    108 int register_android_backup_BackupDataOutput(JNIEnv* env)
    109 {
    110     //LOGD("register_android_backup_BackupDataOutput");
    111     return AndroidRuntime::registerNativeMethods(env, "android/app/backup/BackupDataOutput",
    112             g_methods, NELEM(g_methods));
    113 }
    114 
    115 }
    116