239 lines
7.5 KiB
C
239 lines
7.5 KiB
C
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/*
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ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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/**
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* @file hal_files.h
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* @brief Data files.
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* @details This header defines abstract interfaces useful to access generic
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* data files in a standardized way.
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*
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* @addtogroup HAL_FILES
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* @details This module define an abstract interface for generic data files by
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* extending the @p BaseSequentialStream interface. Note that no code
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* is present, data files are just abstract interface-like structures,
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* you should look at the systems as to a set of abstract C++ classes
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* (even if written in C). This system has the advantage to make the
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* access to streams independent from the implementation logic.<br>
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* The data files interface can be used as base class for high level
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* object types such as an API for a File System implementation.
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* @{
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*/
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#ifndef HAL_FILES_H
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#define HAL_FILES_H
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/**
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* @name Files return codes
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* @{
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*/
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/**
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* @brief No error return code.
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*/
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#define FILE_OK STM_OK
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/**
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* @brief Error code from the file stream methods.
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*/
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#define FILE_ERROR STM_TIMEOUT
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/**
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* @brief End-of-file condition for file get/put methods.
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*/
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#define FILE_EOF STM_RESET
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/** @} */
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/**
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* @brief File offset type.
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*/
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typedef uint32_t fileoffset_t;
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/**
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* @brief FileStream specific methods.
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*/
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#define _file_stream_methods \
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_base_sequential_stream_methods \
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/* File close method.*/ \
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msg_t (*close)(void *instance); \
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/* Get last error code method.*/ \
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msg_t (*geterror)(void *instance); \
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/* File get size method.*/ \
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msg_t (*getsize)(void *instance); \
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/* File get current position method.*/ \
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msg_t (*getposition)(void *instance); \
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/* File seek method.*/ \
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msg_t (*lseek)(void *instance, fileoffset_t offset);
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/**
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* @brief @p FileStream specific data.
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* @note It is empty because @p FileStream is only an interface
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* without implementation.
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*/
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#define _file_stream_data \
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_base_sequential_stream_data
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/**
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* @extends BaseSequentialStreamVMT
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*
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* @brief @p FileStream virtual methods table.
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*/
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struct FileStreamVMT {
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_file_stream_methods
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};
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/**
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* @extends BaseSequentialStream
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*
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* @brief Base file stream class.
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* @details This class represents a generic file data stream.
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*/
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typedef struct {
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/** @brief Virtual Methods Table.*/
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const struct FileStreamVMT *vmt;
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_file_stream_data
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} FileStream;
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/**
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* @name Macro Functions (FileStream)
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* @{
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*/
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/**
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* @brief File stream write.
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* @details The function writes data from a buffer to a file stream.
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*
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* @param[in] ip pointer to a @p FileStream or derived class
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* @param[in] bp pointer to the data buffer
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* @param[in] n the maximum amount of data to be transferred
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* @return The number of bytes transferred. The return value can
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* be less than the specified number of bytes if an
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* end-of-file condition has been met.
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* @retval FILE_ERROR operation failed.
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*
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* @api
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*/
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#define fileStreamWrite(ip, bp, n) streamWrite(ip, bp, n)
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/**
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* @brief File stream read.
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* @details The function reads data from a file stream into a buffer.
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*
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* @param[in] ip pointer to a @p FileStream or derived class
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* @param[out] bp pointer to the data buffer
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* @param[in] n the maximum amount of data to be transferred
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* @return The number of bytes transferred. The return value can
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* be less than the specified number of bytes if an
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* end-of-file condition has been met.
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* @retval FILE_ERROR operation failed.
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*
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* @api
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*/
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#define fileStreamRead(ip, bp, n) streamRead(ip, bp, n)
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/**
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* @brief File stream blocking byte write.
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* @details This function writes a byte value to a channel. If the channel
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* is not ready to accept data then the calling thread is suspended.
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*
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* @param[in] ip pointer to a @p FileStream or derived class
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* @param[in] b the byte value to be written to the channel
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*
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* @return The operation status.
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* @retval FILE_OK if the operation succeeded.
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* @retval FILE_ERROR operation failed.
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* @retval FILE_EOF if an end-of-file condition has been met.
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*
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* @api
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*/
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#define fileStreamPut(ip, b) streamPut(ip, b)
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/**
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* @brief File stream blocking byte read.
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* @details This function reads a byte value from a channel. If the data
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* is not available then the calling thread is suspended.
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*
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* @param[in] ip pointer to a @p FileStream or derived class
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*
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* @return A byte value from the queue.
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* @retval FILE_ERROR operation failed.
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* @retval FILE_EOF if an end-of-file condition has been met.
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*
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* @api
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*/
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#define fileStreamGet(ip) streamGet(ip)
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/**
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* @brief File Stream close.
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* @details The function closes a file stream.
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*
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* @param[in] ip pointer to a @p FileStream or derived class
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* @return The operation status.
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* @retval FILE_OK no error.
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* @retval FILE_ERROR operation failed.
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*
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* @api
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*/
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#define fileStreamClose(ip) ((ip)->vmt->close(ip))
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/**
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* @brief Returns an implementation dependent error code.
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* @pre The previously called function must have returned @p FILE_ERROR.
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*
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* @param[in] ip pointer to a @p FileStream or derived class
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* @return Implementation dependent error code.
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*
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* @api
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*/
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#define fileStreamGetError(ip) ((ip)->vmt->geterror(ip))
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/**
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* @brief Returns the current file size.
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*
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* @param[in] ip pointer to a @p FileStream or derived class
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* @return The file size.
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* @retval FILE_ERROR operation failed.
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*
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* @api
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*/
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#define fileStreamGetSize(ip) ((ip)->vmt->getsize(ip))
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/**
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* @brief Returns the current file pointer position.
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*
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* @param[in] ip pointer to a @p FileStream or derived class
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* @return The current position inside the file.
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* @retval FILE_ERROR operation failed.
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*
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* @api
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*/
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#define fileStreamGetPosition(ip) ((ip)->vmt->getposition(ip))
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/**
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* @brief Moves the file current pointer to an absolute position.
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*
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* @param[in] ip pointer to a @p FileStream or derived class
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* @param[in] offset new absolute position
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* @return The operation status.
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* @retval FILE_OK no error.
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* @retval FILE_ERROR operation failed.
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*
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* @api
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*/
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#define fileStreamSeek(ip, offset) ((ip)->vmt->lseek(ip, offset))
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/** @} */
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#endif /* HAL_FILES_H */
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/** @} */
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