mirror of https://github.com/ArduPilot/ardupilot
81 lines
2.7 KiB
C++
81 lines
2.7 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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#pragma once
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#include "AP_Filesystem_backend.h"
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#if HAVE_FILESYSTEM_SUPPORT
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#include <AP_Param/AP_Param.h>
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class AP_Filesystem_Param : public AP_Filesystem_Backend
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{
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public:
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// functions that closely match the equivalent posix calls
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int open(const char *fname, int flags) override;
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int close(int fd) override;
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ssize_t read(int fd, void *buf, size_t count) override;
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ssize_t write(int fd, const void *buf, size_t count) override;
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int fsync(int fd) override;
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off_t lseek(int fd, off_t offset, int whence) override;
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int stat(const char *pathname, struct stat *stbuf) override;
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int unlink(const char *pathname) override;
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int mkdir(const char *pathname) override;
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void *opendir(const char *pathname) override;
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struct dirent *readdir(void *dirp) override;
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int closedir(void *dirp) override;
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// return free disk space in bytes, -1 on error
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int64_t disk_free(const char *path) override;
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// return total disk space in bytes, -1 on error
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int64_t disk_space(const char *path) override;
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// set modification time on a file
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bool set_mtime(const char *filename, const time_t mtime_sec) override;
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private:
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// we maintain two cursors per open file to minimise seeking
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// when filling in gaps
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static constexpr uint8_t num_cursors = 2;
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// only allow up to 4 files at a time
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static constexpr uint8_t max_open_file = 4;
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// maximum size of one packed parameter
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static constexpr uint8_t max_pack_len = AP_MAX_NAME_SIZE + 2 + 4;
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struct cursor {
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AP_Param::ParamToken token;
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uint32_t token_ofs;
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char last_name[AP_MAX_NAME_SIZE+1];
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uint8_t trailer_len;
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uint8_t trailer[max_pack_len];
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};
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struct rfile {
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bool open;
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uint32_t file_ofs;
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struct cursor *cursors;
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} file[max_open_file];
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bool token_seek(const struct rfile &r, struct cursor &c);
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uint8_t pack_param(const AP_Param *ap, const char *pname, const char *last_name,
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enum ap_var_type ptype, uint8_t *buf, uint8_t buflen);
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};
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#endif // HAVE_FILESYSTEM_SUPPORT
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