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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 "core_jni_helpers.h"
     22 
     23 #include <androidfw/BackupHelpers.h>
     24 
     25 namespace android
     26 {
     27 
     28 static jlong
     29 ctor_native(JNIEnv* env, jobject clazz, jobject fileDescriptor)
     30 {
     31     int fd = jniGetFDFromFileDescriptor(env, fileDescriptor);
     32     if (fd == -1) {
     33         return (jlong)NULL;
     34     }
     35 
     36     return (jlong)new BackupDataWriter(fd);
     37 }
     38 
     39 static void
     40 dtor_native(JNIEnv* env, jobject clazz, jlong w)
     41 {
     42     delete (BackupDataWriter*)w;
     43 }
     44 
     45 static jint
     46 writeEntityHeader_native(JNIEnv* env, jobject clazz, jlong w, jstring key, jint 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     err = writer->WriteEntityHeader(String8(keyUTF), dataSize);
     56 
     57     env->ReleaseStringUTFChars(key, keyUTF);
     58 
     59     return (jint)err;
     60 }
     61 
     62 static jint
     63 writeEntityData_native(JNIEnv* env, jobject clazz, jlong w, jbyteArray data, jint size)
     64 {
     65     int err;
     66     BackupDataWriter* writer = (BackupDataWriter*)w;
     67 
     68     if (env->GetArrayLength(data) < size) {
     69         // size mismatch
     70         return -1;
     71     }
     72 
     73     jbyte* dataBytes = env->GetByteArrayElements(data, NULL);
     74     if (dataBytes == NULL) {
     75         return -1;
     76     }
     77 
     78     err = writer->WriteEntityData(dataBytes, size);
     79 
     80     env->ReleaseByteArrayElements(data, dataBytes, JNI_ABORT);
     81 
     82     return (jint)err;
     83 }
     84 
     85 static void
     86 setKeyPrefix_native(JNIEnv* env, jobject clazz, jlong w, jstring keyPrefixObj)
     87 {
     88     BackupDataWriter* writer = (BackupDataWriter*)w;
     89 
     90     const char* keyPrefixUTF = env->GetStringUTFChars(keyPrefixObj, NULL);
     91     String8 keyPrefix(keyPrefixUTF ? keyPrefixUTF : "");
     92 
     93     writer->SetKeyPrefix(keyPrefix);
     94 
     95     env->ReleaseStringUTFChars(keyPrefixObj, keyPrefixUTF);
     96 }
     97 
     98 static const JNINativeMethod g_methods[] = {
     99     { "ctor", "(Ljava/io/FileDescriptor;)J", (void*)ctor_native },
    100     { "dtor", "(J)V", (void*)dtor_native },
    101     { "writeEntityHeader_native", "(JLjava/lang/String;I)I", (void*)writeEntityHeader_native },
    102     { "writeEntityData_native", "(J[BI)I", (void*)writeEntityData_native },
    103     { "setKeyPrefix_native", "(JLjava/lang/String;)V", (void*)setKeyPrefix_native },
    104 };
    105 
    106 int register_android_backup_BackupDataOutput(JNIEnv* env)
    107 {
    108     //ALOGD("register_android_backup_BackupDataOutput");
    109     return RegisterMethodsOrDie(env, "android/app/backup/BackupDataOutput",
    110             g_methods, NELEM(g_methods));
    111 }
    112 
    113 }
    114