// Copyright 2015-2017 Parity Technologies
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use std::fmt;
use std::error::Error as StdError;

#[derive(Debug, PartialEq, Eq)]
/// Error concerning the RLP decoder.
pub enum DecoderError {
	/// Data has additional bytes at the end of the valid RLP fragment.
	RlpIsTooBig,
	/// Data has too few bytes for valid RLP.
	RlpIsTooShort,
	/// Expect an encoded list, RLP was something else.
	RlpExpectedToBeList,
	/// Expect encoded data, RLP was something else.
	RlpExpectedToBeData,
	/// Expected a different size list.
	RlpIncorrectListLen,
	/// Data length number has a prefixed zero byte, invalid for numbers.
	RlpDataLenWithZeroPrefix,
	/// List length number has a prefixed zero byte, invalid for numbers.
	RlpListLenWithZeroPrefix,
	/// Non-canonical (longer than necessary) representation used for data or list.
	RlpInvalidIndirection,
	/// Declared length is inconsistent with data specified after.
	RlpInconsistentLengthAndData,
	/// Custom rlp decoding error.
	Custom(&'static str),
}

impl StdError for DecoderError {
	fn description(&self) -> &str {
		"builder error"
	}
}

impl fmt::Display for DecoderError {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
		fmt::Debug::fmt(&self, f)
	}
}