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Implement the C++ class to write the backed up file data.

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This commit is contained in:
Joe Onorato
2009-05-15 09:07:06 -04:00
parent eae850cefe
commit 4535e40544
6 changed files with 464 additions and 17 deletions
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32
include/utils/ByteOrder.h
View File

@ -38,6 +38,16 @@
* intent is to allow us to avoid byte swapping on the device.
*/
static inline uint32_t android_swap_long(uint32_t v)
{
return (v<<24) | ((v<<8)&0x00FF0000) | ((v>>8)&0x0000FF00) | (v>>24);
}
static inline uint16_t android_swap_short(uint16_t v)
{
return (v<<8) | (v>>8);
}
#define DEVICE_BYTE_ORDER LITTLE_ENDIAN
#if BYTE_ORDER == DEVICE_BYTE_ORDER
@ -49,16 +59,6 @@
#else
static inline uint32_t android_swap_long(uint32_t v)
{
return (v<<24) | ((v<<8)&0x00FF0000) | ((v>>8)&0x0000FF00) | (v>>24);
}
static inline uint16_t android_swap_short(uint16_t v)
{
return (v<<8) | (v>>8);
}
#define dtohl(x) (android_swap_long(x))
#define dtohs(x) (android_swap_short(x))
#define htodl(x) (android_swap_long(x))
@ -66,4 +66,16 @@ static inline uint16_t android_swap_short(uint16_t v)
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
#define fromlel(x) (x)
#define fromles(x) (x)
#define tolel(x) (x)
#define toles(x) (x)
#else
#define fromlel(x) (android_swap_long(x))
#define fromles(x) (android_swap_short(x))
#define tolel(x) (android_swap_long(x))
#define toles(x) (android_swap_short(x))
#endif
#endif // _LIBS_UTILS_BYTE_ORDER_H

54
include/utils/backup_helpers.h
View File

@ -1,15 +1,69 @@
/*
* 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>
namespace android {
int back_up_files(int oldSnapshotFD, int oldDataStream, int newSnapshotFD,
char const* fileBase, char const* const* files, int fileCount);
/**
* Reads 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 WriteAppHeader(const String8& packageName);
status_t WriteEntityHeader(const String8& key, size_t dataSize);
status_t WriteEntityData(const void* data, size_t size);
status_t WriteAppFooter();
private:
explicit BackupDataWriter();
status_t write_padding_for(int n);
int m_fd;
status_t m_status;
ssize_t m_pos;
int m_entityCount;
};
#define TEST_BACKUP_HELPERS 0
#if TEST_BACKUP_HELPERS
int backup_helper_test_empty();
int backup_helper_test_four();
int backup_helper_test_files();
int backup_helper_test_data_writer();
#endif
} // namespace android
#endif // _UTILS_BACKUP_HELPERS_H