214 lines
5.5 KiB
C
214 lines
5.5 KiB
C
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/**
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* @file cm_fs.h
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* @brief 文件系统通用API接口
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* @copyright Copyright © 2021 China Mobile IOT. All rights reserved.
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* @author By WangPeng
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* @date 2021/4/7
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*
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* @defgroup fs
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* @ingroup fs
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* @{
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*/
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#ifndef __CM_FS_H__
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#define __CM_FS_H__
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <stdint.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* 模组使用LittleFS文件系统，请按照下文描述的文件打开方式使用。错误使用时文件系统无法保证文件功能正常 */
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#define CM_FS_RB (0) /*!< rb，打开一个二进制文件，文件必须存在，只允许读 */
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#define CM_FS_WB (1) /*!< wb，新建一个二进制文件，已存在的文件内容清空，只允许写 */
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#define CM_FS_AB (2) /*!< ab，打开或新建一个二进制文件，只允许在文件末尾追写 */
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#define CM_FS_WBPLUS (3) /*!< wb+，新建一个二进制文件，已存在的文件内容清空，允许读写 */
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#define CM_FS_ABPLUS (4) /*!< ab+，打开或新建一个二进制文件，可读，只允许在文件末尾追写 */
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#define CM_FS_RBPLUS (5) /*!< rb+，打开一个二进制文件，文件必须存在，允许读写 */
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#define CM_FS_SEEK_SET (0) /*!< SEEK_SET，文件开头 */
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#define CM_FS_SEEK_CUR (1) /*!< SEEK_CUR，当前位置 */
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#define CM_FS_SEEK_END (2) /*!< SEEK_END，文件结尾 */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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typedef struct
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{
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uint32_t free_size; /*!< 当前可用文件系统大小 */
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uint32_t total_size; /*!< 文件系统总大小 */
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} cm_fs_system_info_t;
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C" {
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************/
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/**
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* @brief 打开一个文件
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*
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* @param [in] filename 文件名称
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* @param [in] flag 打开参数
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*
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* @return
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* >= 0 - 文件描述符 \n
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* < 0 - 错误
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*
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* @details 文件系统中无路径/文件夹功能，勿在filename入参中传入路径信息
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*/
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int32_t cm_fs_open(const char *filename, int32_t flag);
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/**
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* @brief 关闭一个文件
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*
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* @param [in] fd 文件描述符
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*
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* @return
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* = 0 - 成功 \n
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* < 0 - 失败
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*/
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int32_t cm_fs_close(int32_t fd);
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/**
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* @brief 读取文件内容
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*
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* @param [in] fd 文件描述符
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* @param [out] buf 存储数据的缓冲区指针
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* @param [in] size 要读取的数据长度
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*
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* @return
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* >= 0 - 实际的读取长度 \n
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* < 0 - 读取失败
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*/
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int32_t cm_fs_read(int32_t fd, void *buf, uint32_t size);
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/**
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* @brief 写入文件内容
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*
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* @param [in] fd 文件描述符
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* @param [in] buf 存储数据的缓冲区指针
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* @param [in] size 要写入的数据长度
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*
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* @return
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* >= 0 - 实际的写入长度 \n
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* < 0 - 写入失败
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*/
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int32_t cm_fs_write(int32_t fd, const void *buf, uint32_t size);
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#if 0
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/**
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* @brief 将处于堆栈状态的文件与存储设备中的文件同步
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*
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* @param [in] fd 文件描述符
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*
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* @return
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* = 0 - 同步成功 \n
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* < 0 - 同步失败
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*
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* @details 本平台不支持该接口
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*/
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int32_t cm_fs_sync(int32_t fd);
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#endif
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/**
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* @brief 文件指针定位
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*
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* @param [in] fd 文件描述符
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* @param [in] offset 指针偏移量
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* @param [in] base 偏移起始点，CM_FS_SEEK_SET：文件开头 CM_FS_SEEK_CUR：当前位置 CM_FS_SEEK_END：文件末尾
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*
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* @return
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* = 0 - 成功 \n
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* < 0 - 失败
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*
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* @details offset不支持为负数
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*/
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int32_t cm_fs_seek(int32_t fd, int32_t offset, int32_t base);
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/**
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* @brief 删除文件
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*
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* @param [in] file_name 文件路径
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*
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* @return
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* >= 0 - 成功 \n
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* < 0 - 失败
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*/
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int32_t cm_fs_delete(const char *file_name);
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/**
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* @brief 更改文件名
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*
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* @param [in] src 原文件名
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* @param [in] dest 新文件名
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*
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* @return
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* = 0 - 成功 \n
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* < 0 - 失败
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*/
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int32_t cm_fs_move(const char *src, const char *dest);
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/**
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* @brief 检查文件是否存在
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*
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* @param [in] file_name 文件名称
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*
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* @return
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* = 1 - 存在 \n
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* = 0 - 不存在
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*
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* @details 文件系统中无路径/文件夹功能，勿在path入参中传入路径信息
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*/
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int32_t cm_fs_exist(const char *file_name);
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/**
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* @brief 获取文件大小
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*
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* @param [in] file_name 文件路径
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* @return
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*
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* >= 0 - 文件长度 \n
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* < 0 - 操作失败
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*
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* @details More details
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*/
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int32_t cm_fs_filesize(const char *file_name);
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/**
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* @brief 获取文件系统信息
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*
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* @param [out] info 文件系统信息
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*
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* @return
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* = 0 - 成功 \n
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* < 0 - 失败
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*/
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int32_t cm_fs_getinfo(cm_fs_system_info_t *info);
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __CM_FS_H__ */
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/** @}*/
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