2020-03-11 03:48:09 -03:00
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/*
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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 interface for ROMFS
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*/
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#include "AP_Filesystem.h"
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#include "AP_Filesystem_ROMFS.h"
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#include <AP_HAL/AP_HAL.h>
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#include <AP_Math/AP_Math.h>
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#include <AP_ROMFS/AP_ROMFS.h>
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#if defined(HAL_HAVE_AP_ROMFS_EMBEDDED_H) && HAVE_FILESYSTEM_SUPPORT
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int AP_Filesystem_ROMFS::open(const char *fname, int flags)
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{
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2020-03-12 02:35:22 -03:00
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if ((flags & O_ACCMODE) != O_RDONLY) {
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errno = EROFS;
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return -1;
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}
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2020-03-11 03:48:09 -03:00
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uint8_t idx;
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for (idx=0; idx<max_open_file; idx++) {
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if (file[idx].data == nullptr) {
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break;
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}
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}
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if (idx == max_open_file) {
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errno = ENFILE;
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return -1;
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}
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if (file[idx].data != nullptr) {
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errno = EBUSY;
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return -1;
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}
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file[idx].data = AP_ROMFS::find_decompress(fname, file[idx].size);
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if (file[idx].data == nullptr) {
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errno = ENOENT;
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return -1;
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}
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file[idx].ofs = 0;
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return idx;
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}
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int AP_Filesystem_ROMFS::close(int fd)
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{
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if (fd < 0 || fd >= max_open_file || file[fd].data == nullptr) {
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errno = EBADF;
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return -1;
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}
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AP_ROMFS::free(file[fd].data);
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file[fd].data = nullptr;
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return 0;
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}
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ssize_t AP_Filesystem_ROMFS::read(int fd, void *buf, size_t count)
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{
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if (fd < 0 || fd >= max_open_file || file[fd].data == nullptr) {
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errno = EBADF;
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return -1;
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}
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count = MIN(file[fd].size - file[fd].ofs, count);
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if (count == 0) {
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return 0;
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}
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memcpy(buf, &file[fd].data[file[fd].ofs], count);
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file[fd].ofs += count;
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return count;
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}
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ssize_t AP_Filesystem_ROMFS::write(int fd, const void *buf, size_t count)
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{
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errno = EROFS;
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return -1;
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}
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int AP_Filesystem_ROMFS::fsync(int fd)
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{
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return 0;
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}
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off_t AP_Filesystem_ROMFS::lseek(int fd, off_t offset, int seek_from)
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{
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if (fd < 0 || fd >= max_open_file || file[fd].data == nullptr) {
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errno = EBADF;
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return -1;
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}
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switch (seek_from) {
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case SEEK_SET:
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file[fd].ofs = MIN(file[fd].size, offset);
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break;
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case SEEK_CUR:
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file[fd].ofs = MIN(file[fd].size, offset+file[fd].ofs);
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break;
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case SEEK_END:
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file[fd].ofs = file[fd].size;
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break;
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}
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return file[fd].ofs;
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}
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int AP_Filesystem_ROMFS::stat(const char *name, struct stat *stbuf)
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{
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uint32_t size;
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const uint8_t *data = AP_ROMFS::find_decompress(name, size);
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if (data == nullptr) {
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errno = ENOENT;
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return -1;
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}
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AP_ROMFS::free(data);
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memset(stbuf, 0, sizeof(*stbuf));
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stbuf->st_size = size;
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return 0;
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}
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int AP_Filesystem_ROMFS::unlink(const char *pathname)
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{
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errno = EROFS;
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return -1;
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}
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int AP_Filesystem_ROMFS::mkdir(const char *pathname)
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{
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errno = EROFS;
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return -1;
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}
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void *AP_Filesystem_ROMFS::opendir(const char *pathname)
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{
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uint8_t idx;
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for (idx=0; idx<max_open_dir; idx++) {
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if (dir[idx].path == nullptr) {
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break;
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}
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}
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if (idx == max_open_dir) {
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errno = ENFILE;
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return nullptr;
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}
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dir[idx].ofs = 0;
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dir[idx].path = strdup(pathname);
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if (!dir[idx].path) {
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return nullptr;
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}
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return (void*)&dir[idx];
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}
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struct dirent *AP_Filesystem_ROMFS::readdir(void *dirp)
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{
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uint32_t idx = ((rdir*)dirp) - &dir[0];
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if (idx >= max_open_dir) {
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errno = EBADF;
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return nullptr;
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}
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const char *name = AP_ROMFS::dir_list(dir[idx].path, dir[idx].ofs);
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if (!name) {
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return nullptr;
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}
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const uint32_t plen = strlen(dir[idx].path);
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if (strncmp(name, dir[idx].path, plen) != 0 || name[plen] != '/') {
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return nullptr;
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}
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name += plen + 1;
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dir[idx].de.d_type = DT_REG;
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strncpy(dir[idx].de.d_name, name, sizeof(dir[idx].de.d_name));
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return &dir[idx].de;
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}
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int AP_Filesystem_ROMFS::closedir(void *dirp)
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{
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uint32_t idx = ((rdir *)dirp) - &dir[0];
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if (idx >= max_open_dir) {
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errno = EBADF;
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return -1;
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}
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free(dir[idx].path);
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dir[idx].path = nullptr;
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return 0;
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}
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// return free disk space in bytes
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int64_t AP_Filesystem_ROMFS::disk_free(const char *path)
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{
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return 0;
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}
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// return total disk space in bytes
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int64_t AP_Filesystem_ROMFS::disk_space(const char *path)
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{
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return 0;
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}
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/*
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set mtime on a file
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*/
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bool AP_Filesystem_ROMFS::set_mtime(const char *filename, const time_t mtime_sec)
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{
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return false;
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}
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#endif // HAL_HAVE_AP_ROMFS_EMBEDDED_H
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