Add config writing capability
Tested with short (less than 100 characters) and long data strings
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@ -3,7 +3,7 @@ extern crate alloc;
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use core::fmt;
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use alloc::{string::FromUtf8Error, string::String, vec::Vec, rc::Rc};
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use core_io::{self as io, BufRead, BufReader, Read};
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use core_io::{self as io, BufRead, BufReader, Read, Write, Seek, ErrorKind, SeekFrom};
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use libboard_zynq::sdio;
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pub mod sd_reader;
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@ -66,6 +66,38 @@ fn parse_config<'a>(
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}
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Err(Error::KeyNotFoundError(key))
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}
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fn delete_old_entry<'a>(
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key: &str,
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file: fatfs::File<sd_reader::SdReader>,
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mut file_tmp: fatfs::File<sd_reader::SdReader>,
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) -> Result<'a, ()> {
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let prefix = [key, "="].concat();
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let buf_reader = BufReader::new(file);
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for line in buf_reader.lines() {
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let line = line?;
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if !line.starts_with(&prefix) {
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file_tmp.write_all(&[line.as_str(), "\n"].concat().as_bytes())?;
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}
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}
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Ok(())
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}
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fn rename_file<'a>(dir: &fatfs::Dir<sd_reader::SdReader>, old_file_name: &str, new_file_name: &str) -> Result<'a, ()>{
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{
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let old_file = dir.open_file(old_file_name)?;
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let mut new_file = dir.create_file(new_file_name)?;
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new_file.truncate()?;
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for line in BufReader::new(old_file).lines() {
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let line = line?;
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new_file.write_all(&[line.as_str(), "\n"].concat().as_bytes())?;
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}
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}
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dir.remove(old_file_name)?;
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Ok(())
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}
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pub struct Config {
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fs: Option<Rc<fatfs::FileSystem<sd_reader::SdReader>>>,
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@ -112,4 +144,76 @@ impl Config {
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pub fn read_str<'b>(&self, key: &'b str) -> Result<'b, String> {
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Ok(String::from_utf8(self.read(key)?)?)
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}
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pub fn write_str<'b>(&mut self, key: &str, data: &str) -> Result<'b, ()>{
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if let Some(fs) = &self.fs {
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let root_dir = fs.root_dir();
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let config_key_bin = &["/CONFIG/", key, ".BIN"].concat();
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let config_txt_tmp = "/CONFIG.TMP";
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if data.is_ascii() & (data.len() <= 100) {
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match root_dir.create_file("/CONFIG.TXT") {
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Ok(file) => {
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let mut file_tmp = root_dir.create_file(config_txt_tmp)?;
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file_tmp.truncate()?;
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delete_old_entry(key, file, file_tmp)?;
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},
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Err(e) => {
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return Err(Error::IoError(e));
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}
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};
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rename_file(&root_dir, config_txt_tmp, "/CONFIG.TXT")?;
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let mut file = root_dir.open_file("/CONFIG.TXT")?;
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file.seek(SeekFrom::End(0))?;
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file.write_all(&["\n", key, "=", data, "\n"].concat().as_bytes())?;
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match root_dir.remove(config_key_bin) {
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Ok(_) => {},
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Err(e) => match e.kind() {
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ErrorKind::NotFound => {},
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_ => {
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return Err(Error::IoError(e));
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}
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}
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};
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} else {
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root_dir.create_dir("/CONFIG")?;
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match root_dir.create_file(config_key_bin) {
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Ok(mut file) => {
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file.truncate()?;
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file.write_all(&[data, "\n"].concat().as_bytes())?;
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},
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Err(e) => {
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return Err(Error::IoError(e));
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}
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};
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let mut need_to_rename = false;
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match root_dir.open_file("/CONFIG.TXT") {
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Ok(file) => {
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need_to_rename = true;
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let mut file_tmp = root_dir.create_file(config_txt_tmp)?;
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file_tmp.truncate()?;
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delete_old_entry(key, file, file_tmp)?;
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},
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Err(e) => match e.kind() {
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ErrorKind::NotFound => {},
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_ => {
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return Err(Error::IoError(e));
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}
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}
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};
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if need_to_rename { // docs: ensure no ref to files
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rename_file(&root_dir, config_txt_tmp, "/CONFIG.TXT")?;
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}
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}
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Ok(())
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} else {
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Err(Error::NoConfig)
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}
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}
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}
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