ardupilot/libraries/AP_Filesystem/AP_Filesystem_ROMFS.h

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/*
This program 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.
This program 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/>.
*/
#pragma once
#include "AP_Filesystem_backend.h"
class AP_Filesystem_ROMFS : public AP_Filesystem_Backend
{
public:
// functions that closely match the equivalent posix calls
int open(const char *fname, int flags, bool allow_absolute_paths = false) override;
int close(int fd) override;
int32_t read(int fd, void *buf, uint32_t count) override;
int32_t write(int fd, const void *buf, uint32_t count) override;
int fsync(int fd) override;
int32_t lseek(int fd, int32_t offset, int whence) override;
int stat(const char *pathname, struct stat *stbuf) override;
int unlink(const char *pathname) override;
int mkdir(const char *pathname) override;
void *opendir(const char *pathname) override;
struct dirent *readdir(void *dirp) override;
int closedir(void *dirp) override;
// return free disk space in bytes, -1 on error
int64_t disk_free(const char *path) override;
// return total disk space in bytes, -1 on error
int64_t disk_space(const char *path) override;
// set modification time on a file
bool set_mtime(const char *filename, const uint32_t mtime_sec) override;
/*
load a full file. Use delete to free the data
*/
FileData *load_file(const char *filename) override;
// unload data from load_file()
void unload_file(FileData *fd) override;
private:
// only allow up to 4 files at a time
static constexpr uint8_t max_open_file = 4;
static constexpr uint8_t max_open_dir = 4;
struct rfile {
const uint8_t *data;
uint32_t size;
uint32_t ofs;
} file[max_open_file];
// allow up to 4 directory opens
struct rdir {
char *path;
uint16_t ofs;
struct dirent de;
} dir[max_open_dir];
};