165 lines
4.5 KiB
C++
165 lines
4.5 KiB
C++
/*
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* Copyright (C) 2009 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "FileBackupHelper_native"
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#include <utils/Log.h>
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#include "JNIHelp.h"
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#include <android_runtime/AndroidRuntime.h>
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#include <utils/BackupHelpers.h>
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namespace android
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{
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// java.io.FileDescriptor
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static jfieldID s_descriptorField = 0;
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// android.app.backup.BackupDataInput$EntityHeader
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static jfieldID s_keyField = 0;
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static jfieldID s_dataSizeField = 0;
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static int
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ctor_native(JNIEnv* env, jobject clazz, jobject fileDescriptor)
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{
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int err;
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int fd = env->GetIntField(fileDescriptor, s_descriptorField);
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if (fd == -1) {
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return NULL;
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}
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return (int)new BackupDataReader(fd);
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}
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static void
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dtor_native(JNIEnv* env, jobject clazz, int r)
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{
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delete (BackupDataReader*)r;
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}
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static jint
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readNextHeader_native(JNIEnv* env, jobject clazz, int r, jobject entity)
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{
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int err;
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bool done;
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BackupDataReader* reader = (BackupDataReader*)r;
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int type = 0;
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err = reader->ReadNextHeader(&done, &type);
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if (done) {
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return 1;
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}
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if (err != 0) {
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return err < 0 ? err : -1;
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}
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switch (type) {
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case BACKUP_HEADER_ENTITY_V1:
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{
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String8 key;
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size_t dataSize;
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err = reader->ReadEntityHeader(&key, &dataSize);
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if (err != 0) {
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return err < 0 ? err : -1;
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}
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// TODO: Set the fields in the entity object
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jstring keyStr = env->NewStringUTF(key.string());
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env->SetObjectField(entity, s_keyField, keyStr);
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env->SetIntField(entity, s_dataSizeField, dataSize);
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return 0;
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}
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default:
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LOGD("Unknown header type: 0x%08x\n", type);
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return -1;
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}
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// done
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return 1;
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}
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static jint
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readEntityData_native(JNIEnv* env, jobject clazz, int r, jbyteArray data, int offset, int size)
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{
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int err;
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BackupDataReader* reader = (BackupDataReader*)r;
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if (env->GetArrayLength(data) < (size+offset)) {
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// size mismatch
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return -1;
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}
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jbyte* dataBytes = env->GetByteArrayElements(data, NULL);
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if (dataBytes == NULL) {
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return -2;
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}
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err = reader->ReadEntityData(dataBytes+offset, size);
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env->ReleaseByteArrayElements(data, dataBytes, 0);
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return err;
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}
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static jint
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skipEntityData_native(JNIEnv* env, jobject clazz, int r)
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{
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int err;
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BackupDataReader* reader = (BackupDataReader*)r;
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err = reader->SkipEntityData();
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return err;
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}
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static const JNINativeMethod g_methods[] = {
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{ "ctor", "(Ljava/io/FileDescriptor;)I", (void*)ctor_native },
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{ "dtor", "(I)V", (void*)dtor_native },
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{ "readNextHeader_native", "(ILandroid/app/backup/BackupDataInput$EntityHeader;)I",
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(void*)readNextHeader_native },
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{ "readEntityData_native", "(I[BII)I", (void*)readEntityData_native },
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{ "skipEntityData_native", "(I)I", (void*)skipEntityData_native },
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};
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int register_android_backup_BackupDataInput(JNIEnv* env)
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{
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//LOGD("register_android_backup_BackupDataInput");
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jclass clazz;
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clazz = env->FindClass("java/io/FileDescriptor");
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LOG_FATAL_IF(clazz == NULL, "Unable to find class java.io.FileDescriptor");
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s_descriptorField = env->GetFieldID(clazz, "descriptor", "I");
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LOG_FATAL_IF(s_descriptorField == NULL,
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"Unable to find descriptor field in java.io.FileDescriptor");
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clazz = env->FindClass("android/app/backup/BackupDataInput$EntityHeader");
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LOG_FATAL_IF(clazz == NULL, "Unable to find class android.app.backup.BackupDataInput.EntityHeader");
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s_keyField = env->GetFieldID(clazz, "key", "Ljava/lang/String;");
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LOG_FATAL_IF(s_keyField == NULL,
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"Unable to find key field in android.app.backup.BackupDataInput.EntityHeader");
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s_dataSizeField = env->GetFieldID(clazz, "dataSize", "I");
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LOG_FATAL_IF(s_dataSizeField == NULL,
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"Unable to find dataSize field in android.app.backup.BackupDataInput.EntityHeader");
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return AndroidRuntime::registerNativeMethods(env, "android/app/backup/BackupDataInput",
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g_methods, NELEM(g_methods));
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}
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}
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