libconfig/src/lib.rs

@@ -11,17 +11,17 @@ pub mod net_settings;
 pub mod bootgen;
 
 #[derive(Debug)]
-pub enum Error {
+pub enum Error<'a> {
     SdError(sdio::sd_card::CardInitializationError),
     IoError(io::Error),
     Utf8Error(FromUtf8Error),
-    KeyNotFoundError(String),
+    KeyNotFoundError(&'a str),
     NoConfig,
 }
 
-pub type Result<T> = core::result::Result<T, Error>;
+pub type Result<'a, T> = core::result::Result<T, Error<'a>>;
 
-impl fmt::Display for Error {
+impl<'a> fmt::Display for Error<'a> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
             Error::SdError(error) => write!(f, "SD error: {}", error),
@@ -33,29 +33,29 @@ impl fmt::Display for Error {
     }
 }
 
-impl From<sdio::sd_card::CardInitializationError> for Error {
+impl<'a> From<sdio::sd_card::CardInitializationError> for Error<'a> {
     fn from(error: sdio::sd_card::CardInitializationError) -> Self {
         Error::SdError(error)
     }
 }
 
-impl From<io::Error> for Error {
+impl<'a> From<io::Error> for Error<'a> {
     fn from(error: io::Error) -> Self {
         Error::IoError(error)
     }
 }
 
-impl From<FromUtf8Error> for Error {
+impl<'a> From<FromUtf8Error> for Error<'a> {
     fn from(error: FromUtf8Error) -> Self {
         Error::Utf8Error(error)
     }
 }
 
-fn parse_config(
+fn parse_config<'a>(
-    key: &str,
+    key: &'a str,
     buffer: &mut Vec<u8>,
     file: fatfs::File<sd_reader::SdReader>,
-) -> Result<()> {
+) -> Result<'a, ()> {
     let prefix = [key, "="].concat().to_ascii_lowercase();
     for line in BufReader::new(file).lines() {
         let line = line?.to_ascii_lowercase();
@@ -64,7 +64,7 @@ fn parse_config(
             return Ok(());
         }
     }
-    Err(Error::KeyNotFoundError(key.into()))
+    Err(Error::KeyNotFoundError(key))
 }
 
 pub struct Config {
@@ -74,7 +74,7 @@ pub struct Config {
 const NEWLINE: &[u8] = b"\n";
 
 impl Config {
-    pub fn new() -> Result<Self> {
+    pub fn new() -> Result<'static, Self> {
         let sdio = sdio::Sdio::sdio0(true);
         if !sdio.is_card_inserted() {
             Err(sdio::sd_card::CardInitializationError::NoCardInserted)?;
@@ -94,7 +94,7 @@ impl Config {
         Config { fs: None }
     }
 
-    pub fn read(&self, key: &str) -> Result<Vec<u8>> {
+    pub fn read<'b>(&self, key: &'b str) -> Result<'b, Vec<u8>> {
         if let Some(fs) = &self.fs {
             let root_dir = fs.root_dir();
             let mut buffer: Vec<u8> = Vec::new();
@@ -102,7 +102,7 @@ impl Config {
                 Ok(mut f) => f.read_to_end(&mut buffer).map(|_| ())?,
                 Err(_) => match root_dir.open_file("/CONFIG.TXT") {
                     Ok(f) => parse_config(key, &mut buffer, f)?,
-                    Err(_) => return Err(Error::KeyNotFoundError(key.into())),
+                    Err(_) => return Err(Error::KeyNotFoundError(key)),
                 },
             };
             Ok(buffer)
@@ -111,11 +111,11 @@ impl Config {
         }
     }
 
-    pub fn read_str(&self, key: &str) -> Result<String> {
+    pub fn read_str<'b>(&self, key: &'b str) -> Result<'b, String> {
         Ok(String::from_utf8(self.read(key)?)?)
     }
 
-    pub fn remove(&self, key: &str) -> Result<()> {
+    pub fn remove<'b>(&self, key: &'b str) -> Result<'b, ()> {
         if let Some(fs) = &self.fs {
             let root_dir = fs.root_dir();
             match root_dir.remove(&["/CONFIG/", key, ".BIN"].concat()) {
@@ -136,7 +136,7 @@ impl Config {
                             }
                             Ok(())
                         },
-                        Err(_) => Err(Error::KeyNotFoundError(key.into()))
+                        Err(_) => Err(Error::KeyNotFoundError(key))
                     }
                 }
             }
@@ -145,7 +145,7 @@ impl Config {
         }
     }
 
-    pub fn write(&self, key: &str, value: Vec<u8>) -> Result<()> {
+    pub fn write<'b>(&self, key: &'b str, value: Vec<u8>) -> Result<'b, ()> {
         if self.fs.is_none() {
             return Err(Error::NoConfig);
         }

libconfig/src/sd_reader.rs

@@ -1,6 +1,6 @@
 use core_io::{BufRead, Error, ErrorKind, Read, Result as IoResult, Seek, SeekFrom, Write};
 use fatfs;
-use libboard_zynq::sdio::sd_card::SdCard;
+use libboard_zynq::sdio::{sd_card::SdCard, CmdTransferError};
 use log::debug;
 use alloc::vec::Vec;
 
@@ -12,6 +12,10 @@ const PARTID_FAT32: u8 = 0x0B;
 const PARTID_FAT32_LBA: u8 = 0x0C;
 const PARTID_FAT16_LBA: u8 = 0x0E;
 
+fn cmd_error_to_io_error(_: CmdTransferError) -> Error {
+    Error::new(ErrorKind::Other, "Command transfer error")
+}
+
 const BLOCK_SIZE: usize = 512;
 
 /// SdReader struct implementing `Read + BufRead + Write + Seek` traits for `core_io`.
@@ -217,7 +221,7 @@ impl BufRead for SdReader {
             // reload buffer
             self.sd
                 .read_block(self.byte_addr / (BLOCK_SIZE as u32), 1, &mut self.buffer)
-                .map_err(|_| Error::new(ErrorKind::Other, "Command transfer error"))?;
+                .map_err(cmd_error_to_io_error)?;
             self.index = (self.byte_addr as usize) % BLOCK_SIZE;
         }
         Ok(&self.buffer[self.index..])
@@ -256,7 +260,7 @@ impl Write for SdReader {
             let block_addr = (self.byte_addr - self.index as u32) / (BLOCK_SIZE as u32);
             self.sd
                 .write_block(block_addr, 1, &self.buffer)
-                .map_err(|_| Error::new(ErrorKind::Other, "Command transfer error"))?;
+                .map_err(cmd_error_to_io_error)?;
             self.dirty = false;
         }
         Ok(())