android_backup_BackupDataInput.cpp revision 4528186e0d65fc68ef0dd1941aa2ac8aefcd55a3
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 25namespace android 26{ 27 28// java.io.FileDescriptor 29static jfieldID s_descriptorField = 0; 30 31// android.app.backup.BackupDataInput$EntityHeader 32static jfieldID s_keyField = 0; 33static jfieldID s_dataSizeField = 0; 34 35static int 36ctor_native(JNIEnv* env, jobject clazz, jobject fileDescriptor) 37{ 38 int err; 39 40 int fd = env->GetIntField(fileDescriptor, s_descriptorField); 41 if (fd == -1) { 42 return NULL; 43 } 44 45 return (int)new BackupDataReader(fd); 46} 47 48static void 49dtor_native(JNIEnv* env, jobject clazz, int r) 50{ 51 delete (BackupDataReader*)r; 52} 53 54static jint 55readNextHeader_native(JNIEnv* env, jobject clazz, int r, jobject entity) 56{ 57 int err; 58 bool done; 59 BackupDataReader* reader = (BackupDataReader*)r; 60 61 int type = 0; 62 63 err = reader->ReadNextHeader(&done, &type); 64 if (done) { 65 return 1; 66 } 67 68 if (err != 0) { 69 return err < 0 ? err : -1; 70 } 71 72 switch (type) { 73 case BACKUP_HEADER_ENTITY_V1: 74 { 75 String8 key; 76 size_t dataSize; 77 err = reader->ReadEntityHeader(&key, &dataSize); 78 if (err != 0) { 79 return err < 0 ? err : -1; 80 } 81 // TODO: Set the fields in the entity object 82 jstring keyStr = env->NewStringUTF(key.string()); 83 env->SetObjectField(entity, s_keyField, keyStr); 84 env->SetIntField(entity, s_dataSizeField, dataSize); 85 return 0; 86 } 87 default: 88 LOGD("Unknown header type: 0x%08x\n", type); 89 return -1; 90 } 91 92 // done 93 return 1; 94} 95 96static jint 97readEntityData_native(JNIEnv* env, jobject clazz, int r, jbyteArray data, int offset, int size) 98{ 99 int err; 100 BackupDataReader* reader = (BackupDataReader*)r; 101 102 if (env->GetArrayLength(data) < (size+offset)) { 103 // size mismatch 104 return -1; 105 } 106 107 jbyte* dataBytes = env->GetByteArrayElements(data, NULL); 108 if (dataBytes == NULL) { 109 return -2; 110 } 111 112 err = reader->ReadEntityData(dataBytes+offset, size); 113 114 env->ReleaseByteArrayElements(data, dataBytes, 0); 115 116 return err; 117} 118 119static jint 120skipEntityData_native(JNIEnv* env, jobject clazz, int r) 121{ 122 int err; 123 BackupDataReader* reader = (BackupDataReader*)r; 124 125 err = reader->SkipEntityData(); 126 127 return err; 128} 129 130static const JNINativeMethod g_methods[] = { 131 { "ctor", "(Ljava/io/FileDescriptor;)I", (void*)ctor_native }, 132 { "dtor", "(I)V", (void*)dtor_native }, 133 { "readNextHeader_native", "(ILandroid/app/backup/BackupDataInput$EntityHeader;)I", 134 (void*)readNextHeader_native }, 135 { "readEntityData_native", "(I[BII)I", (void*)readEntityData_native }, 136 { "skipEntityData_native", "(I)I", (void*)skipEntityData_native }, 137}; 138 139int register_android_backup_BackupDataInput(JNIEnv* env) 140{ 141 //LOGD("register_android_backup_BackupDataInput"); 142 143 jclass clazz; 144 145 clazz = env->FindClass("java/io/FileDescriptor"); 146 LOG_FATAL_IF(clazz == NULL, "Unable to find class java.io.FileDescriptor"); 147 s_descriptorField = env->GetFieldID(clazz, "descriptor", "I"); 148 LOG_FATAL_IF(s_descriptorField == NULL, 149 "Unable to find descriptor field in java.io.FileDescriptor"); 150 151 clazz = env->FindClass("android/app/backup/BackupDataInput$EntityHeader"); 152 LOG_FATAL_IF(clazz == NULL, "Unable to find class android.app.backup.BackupDataInput.EntityHeader"); 153 s_keyField = env->GetFieldID(clazz, "key", "Ljava/lang/String;"); 154 LOG_FATAL_IF(s_keyField == NULL, 155 "Unable to find key field in android.app.backup.BackupDataInput.EntityHeader"); 156 s_dataSizeField = env->GetFieldID(clazz, "dataSize", "I"); 157 LOG_FATAL_IF(s_dataSizeField == NULL, 158 "Unable to find dataSize field in android.app.backup.BackupDataInput.EntityHeader"); 159 160 return AndroidRuntime::registerNativeMethods(env, "android/app/backup/BackupDataInput", 161 g_methods, NELEM(g_methods)); 162} 163 164} 165