mirror of https://github.com/ArduPilot/ardupilot
98 lines
3.2 KiB
C++
98 lines
3.2 KiB
C++
/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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ArduPilot filesystem backend interface.
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*/
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#pragma once
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#include <stdint.h>
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#include <AP_HAL/AP_HAL_Boards.h>
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#include "AP_Filesystem_config.h"
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#include <AP_InternalError/AP_InternalError.h>
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// returned structure from a load_file() call
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class FileData {
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public:
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uint32_t length;
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const uint8_t *data;
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FileData(void *_backend) :
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backend(_backend) {}
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// destructor to free data
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~FileData();
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private:
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const void *backend;
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};
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class AP_Filesystem_Backend {
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public:
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// functions that closely match the equivalent posix calls
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virtual int open(const char *fname, int flags, bool allow_absolute_paths = false) {
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return -1;
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}
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virtual int close(int fd) { return -1; }
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virtual int32_t read(int fd, void *buf, uint32_t count) { return -1; }
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virtual int32_t write(int fd, const void *buf, uint32_t count) { return -1; }
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virtual int fsync(int fd) { return 0; }
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virtual int32_t lseek(int fd, int32_t offset, int whence) { return -1; }
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virtual int stat(const char *pathname, struct stat *stbuf) { return -1; }
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virtual int unlink(const char *pathname) { return -1; }
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virtual int mkdir(const char *pathname) { return -1; }
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virtual void *opendir(const char *pathname) { return nullptr; }
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virtual struct dirent *readdir(void *dirp) { return nullptr; }
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virtual int closedir(void *dirp) { return -1; }
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// return free disk space in bytes, -1 on error
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virtual int64_t disk_free(const char *path) { return 0; }
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// return total disk space in bytes, -1 on error
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virtual int64_t disk_space(const char *path) { return 0; }
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// set modification time on a file
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virtual bool set_mtime(const char *filename, const uint32_t mtime_sec) { return false; }
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// retry mount of filesystem if needed
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virtual bool retry_mount(void) { return true; }
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// unmount filesystem for reboot
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virtual void unmount(void) {}
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// format sdcard
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virtual bool format(void) { return false; }
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/*
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load a full file. Use delete to free the data
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*/
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virtual FileData *load_file(const char *filename);
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// unload data from load_file()
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virtual void unload_file(FileData *fd);
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protected:
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// return true if file operations are allowed
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bool file_op_allowed(void) const;
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};
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#if CONFIG_HAL_BOARD == HAL_BOARD_SITL
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#define FS_CHECK_ALLOWED(retfail) do { if (!file_op_allowed()) { INTERNAL_ERROR(AP_InternalError::error_t::flow_of_control); return retfail; } } while(0)
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#else
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#define FS_CHECK_ALLOWED(retfail) do { if (!file_op_allowed()) { return retfail; } } while(0)
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#endif
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