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// =============================================================================
// Copyright (c) 2025 - 2026 Haixing Hu.
//
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0.
// =============================================================================
//! Validation errors for HTTP body budgets.
use std::{
error::Error,
fmt::{
self,
Display,
Formatter,
},
};
/// Reports which hard body-budget invariant was violated.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum BodyBudgetError {
/// The input byte limit was zero.
ZeroInput,
/// The output limit cannot contain the complete truncation marker.
OutputTooSmall {
/// Smallest accepted output limit in bytes.
minimum: usize,
/// Rejected output limit in bytes.
actual: usize,
},
}
impl Display for BodyBudgetError {
/// Writes a concise description of the violated budget invariant.
///
/// # Parameters
///
/// * `formatter` - Destination formatting context.
///
/// # Returns
///
/// The formatter result from writing the error description.
///
/// # Errors
///
/// Returns [`fmt::Error`] when the destination rejects a write.
#[inline]
fn fmt(&self, formatter: &mut Formatter<'_>) -> fmt::Result {
match self {
Self::ZeroInput => formatter
.write_str("body input budget must be greater than zero"),
Self::OutputTooSmall { minimum, actual } => write!(
formatter,
"body output budget must be at least {minimum} bytes, got {actual}",
),
}
}
}
impl Error for BodyBudgetError {}