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/*******************************************************************************
*
* Copyright (c) 2026 Haixing Hu.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0.
*
******************************************************************************/
//! Policy hooks used by the default codec-backed buffered decoder.
use super::{
buffered_decode_hooks::BufferedDecodeHooks,
decode_action::DecodeAction,
decode_context::DecodeContext,
};
use crate::{
Codec,
CodecDecodeError,
};
/// Policy hooks for [`super::CodecBufferedDecoder`].
#[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
pub(super) struct CodecBufferedDecodeHooks;
impl<C> BufferedDecodeHooks<C> for CodecBufferedDecodeHooks
where
C: Codec,
{
type Error = CodecDecodeError<C::DecodeError>;
/// Converts codec decode failures into strict buffered decode errors.
///
/// # Parameters
///
/// - `_codec`: Low-level codec instance.
/// - `error`: Decode error produced by the low-level codec.
/// - `context`: Decoding context carrying input position.
///
/// # Returns
///
/// Returns a convert status action wrapped as `CodecDecodeError`.
#[inline(always)]
fn handle_decode_error(
&mut self,
_codec: &C,
error: C::DecodeError,
context: DecodeContext,
) -> Result<DecodeAction<C::Value>, Self::Error> {
Err(CodecDecodeError::decode(error, context.input_index))
}
/// Creates an invalid input index error.
///
/// # Parameters
///
/// - `_codec`: Low-level codec instance.
/// - `index`: Invalid absolute input index.
/// - `input_len`: Input slice length.
///
/// # Returns
///
/// Returns a codec decode error describing the invalid index.
#[inline(always)]
fn invalid_input_index(&mut self, _codec: &C, index: usize, input_len: usize) -> Self::Error {
CodecDecodeError::invalid_input_index(index, input_len)
}
/// Creates an invalid output index error.
///
/// # Parameters
///
/// - `_codec`: Low-level codec instance.
/// - `index`: Invalid absolute output index.
/// - `output_len`: Output slice length.
///
/// # Returns
///
/// Returns a codec decode error describing the invalid output index.
#[inline(always)]
fn invalid_output_index(&mut self, _codec: &C, index: usize, output_len: usize) -> Self::Error {
CodecDecodeError::invalid_output_index(index, output_len)
}
}