9cda3e02c6
because they'll always go in the same order, and this lets us not have to write headers to keep them paired.
157 lines
3.6 KiB
C++
157 lines
3.6 KiB
C++
/*
|
|
* Copyright (C) 2009 The Android Open Source Project
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#ifndef _UTILS_BACKUP_HELPERS_H
|
|
#define _UTILS_BACKUP_HELPERS_H
|
|
|
|
#include <utils/Errors.h>
|
|
#include <utils/String8.h>
|
|
#include <utils/KeyedVector.h>
|
|
|
|
namespace android {
|
|
|
|
enum {
|
|
BACKUP_HEADER_ENTITY_V1 = 0x61746144, // Data (little endian)
|
|
};
|
|
|
|
typedef struct {
|
|
int type; // BACKUP_HEADER_ENTITY_V1
|
|
int keyLen; // length of the key name, not including the null terminator
|
|
int dataSize; // size of the data, not including the padding, -1 means delete
|
|
} entity_header_v1;
|
|
|
|
struct SnapshotHeader {
|
|
int magic0;
|
|
int fileCount;
|
|
int magic1;
|
|
int totalSize;
|
|
};
|
|
|
|
struct FileState {
|
|
int modTime_sec;
|
|
int modTime_nsec;
|
|
int size;
|
|
int crc32;
|
|
int nameLen;
|
|
};
|
|
|
|
struct FileRec {
|
|
String8 file;
|
|
bool deleted;
|
|
FileState s;
|
|
};
|
|
|
|
|
|
/**
|
|
* Writes the data.
|
|
*
|
|
* If an error occurs, it poisons this object and all write calls will fail
|
|
* with the error that occurred.
|
|
*/
|
|
class BackupDataWriter
|
|
{
|
|
public:
|
|
BackupDataWriter(int fd);
|
|
// does not close fd
|
|
~BackupDataWriter();
|
|
|
|
status_t WriteEntityHeader(const String8& key, size_t dataSize);
|
|
status_t WriteEntityData(const void* data, size_t size);
|
|
|
|
void SetKeyPrefix(const String8& keyPrefix);
|
|
|
|
private:
|
|
explicit BackupDataWriter();
|
|
status_t write_padding_for(int n);
|
|
|
|
int m_fd;
|
|
status_t m_status;
|
|
ssize_t m_pos;
|
|
int m_entityCount;
|
|
String8 m_keyPrefix;
|
|
};
|
|
|
|
/**
|
|
* Reads the data.
|
|
*
|
|
* If an error occurs, it poisons this object and all write calls will fail
|
|
* with the error that occurred.
|
|
*/
|
|
class BackupDataReader
|
|
{
|
|
public:
|
|
BackupDataReader(int fd);
|
|
// does not close fd
|
|
~BackupDataReader();
|
|
|
|
status_t Status();
|
|
status_t ReadNextHeader(bool* done, int* type);
|
|
|
|
bool HasEntities();
|
|
status_t ReadEntityHeader(String8* key, size_t* dataSize);
|
|
status_t SkipEntityData(); // must be called with the pointer at the begining of the data.
|
|
ssize_t ReadEntityData(void* data, size_t size);
|
|
|
|
private:
|
|
explicit BackupDataReader();
|
|
status_t skip_padding();
|
|
|
|
int m_fd;
|
|
bool m_done;
|
|
status_t m_status;
|
|
ssize_t m_pos;
|
|
ssize_t m_dataEndPos;
|
|
int m_entityCount;
|
|
union {
|
|
int type;
|
|
entity_header_v1 entity;
|
|
} m_header;
|
|
String8 m_key;
|
|
};
|
|
|
|
int back_up_files(int oldSnapshotFD, BackupDataWriter* dataStream, int newSnapshotFD,
|
|
char const* const* files, char const* const *keys, int fileCount);
|
|
|
|
class RestoreHelperBase
|
|
{
|
|
public:
|
|
RestoreHelperBase();
|
|
~RestoreHelperBase();
|
|
|
|
status_t WriteFile(const String8& filename, BackupDataReader* in);
|
|
status_t WriteSnapshot(int fd);
|
|
|
|
private:
|
|
void* m_buf;
|
|
KeyedVector<String8,FileRec> m_files;
|
|
};
|
|
|
|
#define TEST_BACKUP_HELPERS 1
|
|
|
|
#if TEST_BACKUP_HELPERS
|
|
int backup_helper_test_empty();
|
|
int backup_helper_test_four();
|
|
int backup_helper_test_files();
|
|
int backup_helper_test_null_base();
|
|
int backup_helper_test_missing_file();
|
|
int backup_helper_test_data_writer();
|
|
int backup_helper_test_data_reader();
|
|
#endif
|
|
|
|
} // namespace android
|
|
|
|
#endif // _UTILS_BACKUP_HELPERS_H
|