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// Copyright 2017, Igor Shaula
// Licensed under the MIT License <LICENSE or
// http://opensource.org/licenses/MIT>. This file
// may not be copied, modified, or distributed
// except according to those terms.
use super::enums::*;
use super::RegKey;
use std::error::Error;
use std::fmt;
use std::io;
use winapi::shared::minwindef::DWORD;
macro_rules! read_value {
($s:ident) => {
match mem::replace(&mut $s.f_name, None) {
Some(ref s) => $s.key.get_value(s).map_err(DecoderError::IoError),
None => Err(DecoderError::NoFieldName),
}
};
}
macro_rules! parse_string {
($s:ident) => {{
let s: String = read_value!($s)?;
s.parse()
.map_err(|e| DecoderError::ParseError(format!("{:?}", e)))
}};
}
macro_rules! no_impl {
($e:expr) => {
Err(DecoderError::DecodeNotImplemented($e.to_owned()))
};
}
#[cfg(feature = "serialization-serde")]
mod serialization_serde;
#[derive(Debug)]
pub enum DecoderError {
DecodeNotImplemented(String),
DeserializerError(String),
IoError(io::Error),
ParseError(String),
NoFieldName,
}
impl fmt::Display for DecoderError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self)
}
}
impl Error for DecoderError {}
impl From<io::Error> for DecoderError {
fn from(err: io::Error) -> DecoderError {
DecoderError::IoError(err)
}
}
pub type DecodeResult<T> = Result<T, DecoderError>;
#[derive(Debug)]
enum DecoderReadingState {
WaitingForKey,
WaitingForValue,
}
#[derive(Debug)]
enum DecoderEnumerationState {
EnumeratingKeys(DWORD),
EnumeratingValues(DWORD),
}
#[derive(Debug)]
pub struct Decoder {
key: RegKey,
f_name: Option<String>,
reading_state: DecoderReadingState,
enumeration_state: DecoderEnumerationState,
}
const DECODER_SAM: DWORD = KEY_QUERY_VALUE | KEY_ENUMERATE_SUB_KEYS;
impl Decoder {
pub fn from_key(key: &RegKey) -> DecodeResult<Decoder> {
key.open_subkey_with_flags("", DECODER_SAM)
.map(Decoder::new)
.map_err(DecoderError::IoError)
}
fn new(key: RegKey) -> Decoder {
Decoder {
key,
f_name: None,
reading_state: DecoderReadingState::WaitingForKey,
enumeration_state: DecoderEnumerationState::EnumeratingKeys(0),
}
}
}
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