173 lines
5.5 KiB
C
173 lines
5.5 KiB
C
|
/*
|
||
|
|
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
|
||
|
|
2011,2012,2013 Giovanni Di Sirio.
|
||
|
|
|
||
|
|
This file is part of ChibiOS/RT.
|
||
|
|
|
||
|
|
ChibiOS/RT is free software; you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 3 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
ChibiOS/RT is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||
|
|
|
||
|
|
---
|
||
|
|
|
||
|
|
A special exception to the GPL can be applied should you wish to distribute
|
||
|
|
a combined work that includes ChibiOS/RT, without being obliged to provide
|
||
|
|
the source code for any proprietary components. See the file exception.txt
|
||
|
|
for full details of how and when the exception can be applied.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @file chfiles.h
|
||
|
|
* @brief Data files.
|
||
|
|
* @details This header defines abstract interfaces useful to access generic
|
||
|
|
* data files in a standardized way.
|
||
|
|
*
|
||
|
|
* @addtogroup data_files
|
||
|
|
* @details This module define an abstract interface for generic data files by
|
||
|
|
* extending the @p BaseSequentialStream interface. Note that no code
|
||
|
|
* is present, data files are just abstract interface-like structures,
|
||
|
|
* you should look at the systems as to a set of abstract C++ classes
|
||
|
|
* (even if written in C). This system has the advantage to make the
|
||
|
|
* access to streams independent from the implementation logic.<br>
|
||
|
|
* The data files interface can be used as base class for high level
|
||
|
|
* object types such as an API for a File System implementation.
|
||
|
|
* @{
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef _CHFILES_H_
|
||
|
|
#define _CHFILES_H_
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief No error return code.
|
||
|
|
*/
|
||
|
|
#define FILE_OK 0
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Error code from the file stream methods.
|
||
|
|
*/
|
||
|
|
#define FILE_ERROR 0xFFFFFFFFUL
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief File offset type.
|
||
|
|
*/
|
||
|
|
typedef uint32_t fileoffset_t;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief BaseFileStream specific methods.
|
||
|
|
*/
|
||
|
|
#define _base_file_stream_methods \
|
||
|
|
_base_sequential_stream_methods \
|
||
|
|
/* File close method.*/ \
|
||
|
|
uint32_t (*close)(void *instance); \
|
||
|
|
/* Get last error code method.*/ \
|
||
|
|
int (*geterror)(void *instance); \
|
||
|
|
/* File get size method.*/ \
|
||
|
|
fileoffset_t (*getsize)(void *instance); \
|
||
|
|
/* File get current position method.*/ \
|
||
|
|
fileoffset_t (*getposition)(void *instance); \
|
||
|
|
/* File seek method.*/ \
|
||
|
|
uint32_t (*lseek)(void *instance, fileoffset_t offset);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief @p BaseFileStream specific data.
|
||
|
|
* @note It is empty because @p BaseFileStream is only an interface
|
||
|
|
* without implementation.
|
||
|
|
*/
|
||
|
|
#define _base_file_stream_data \
|
||
|
|
_base_sequential_stream_data
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @extends BaseSequentialStreamVMT
|
||
|
|
*
|
||
|
|
* @brief @p BaseFileStream virtual methods table.
|
||
|
|
*/
|
||
|
|
struct BaseFileStreamVMT {
|
||
|
|
_base_file_stream_methods
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @extends BaseSequentialStream
|
||
|
|
*
|
||
|
|
* @brief Base file stream class.
|
||
|
|
* @details This class represents a generic file data stream.
|
||
|
|
*/
|
||
|
|
typedef struct {
|
||
|
|
/** @brief Virtual Methods Table.*/
|
||
|
|
const struct BaseFileStreamVMT *vmt;
|
||
|
|
_base_file_stream_data
|
||
|
|
} BaseFileStream;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @name Macro Functions (BaseFileStream)
|
||
|
|
* @{
|
||
|
|
*/
|
||
|
|
/**
|
||
|
|
* @brief Base file Stream close.
|
||
|
|
* @details The function closes a file stream.
|
||
|
|
*
|
||
|
|
* @param[in] ip pointer to a @p BaseFileStream or derived class
|
||
|
|
* @return The operation status.
|
||
|
|
* @retval FILE_OK no error.
|
||
|
|
* @retval FILE_ERROR operation failed.
|
||
|
|
*
|
||
|
|
* @api
|
||
|
|
*/
|
||
|
|
#define chFileStreamClose(ip) ((ip)->vmt->close(ip))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Returns an implementation dependent error code.
|
||
|
|
*
|
||
|
|
* @param[in] ip pointer to a @p BaseFileStream or derived class
|
||
|
|
* @return Implementation dependent error code.
|
||
|
|
*
|
||
|
|
* @api
|
||
|
|
*/
|
||
|
|
#define chFileStreamGetError(ip) ((ip)->vmt->geterror(ip))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Returns the current file size.
|
||
|
|
*
|
||
|
|
* @param[in] ip pointer to a @p BaseFileStream or derived class
|
||
|
|
* @return The file size.
|
||
|
|
*
|
||
|
|
* @api
|
||
|
|
*/
|
||
|
|
#define chFileStreamGetSize(ip) ((ip)->vmt->getsize(ip))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Returns the current file pointer position.
|
||
|
|
*
|
||
|
|
* @param[in] ip pointer to a @p BaseFileStream or derived class
|
||
|
|
* @return The current position inside the file.
|
||
|
|
*
|
||
|
|
* @api
|
||
|
|
*/
|
||
|
|
#define chFileStreamGetPosition(ip) ((ip)->vmt->getposition(ip))
|
||
|
|
|
||
|
|
/**
|
||
|
|
* @brief Moves the file current pointer to an absolute position.
|
||
|
|
*
|
||
|
|
* @param[in] ip pointer to a @p BaseFileStream or derived class
|
||
|
|
* @param[in] offset new absolute position
|
||
|
|
* @return The operation status.
|
||
|
|
* @retval FILE_OK no error.
|
||
|
|
* @retval FILE_ERROR operation failed.
|
||
|
|
*
|
||
|
|
* @api
|
||
|
|
*/
|
||
|
|
#define chFileStreamSeek(ip, offset) ((ip)->vmt->lseek(ip, offset))
|
||
|
|
/** @} */
|
||
|
|
|
||
|
|
#endif /* _CHFILES_H_ */
|
||
|
|
|
||
|
|
/** @} */
|