pezkuwichain
b6d35f6faf
Updated 4763 files with dual copyright: - Parity Technologies (UK) Ltd. - Dijital Kurdistan Tech Institute
70 lines
2.3 KiB
Rust
70 lines
2.3 KiB
Rust
// This file is part of Bizinikiwi.
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// Copyright (C) Parity Technologies (UK) Ltd. and Dijital Kurdistan Tech Institute
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! # Running
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//! Running this fuzzer can be done with `cargo hfuzz run per_thing_mult_fraction`. `honggfuzz` CLI
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//! options can be used by setting `HFUZZ_RUN_ARGS`, such as `-n 4` to use 4 threads.
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//!
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//! # Debugging a panic
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//! Once a panic is found, it can be debugged with
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//! `cargo hfuzz run-debug per_thing_mult_fraction hfuzz_workspace/per_thing_mult_fraction/*.fuzz`.
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use honggfuzz::fuzz;
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use pezsp_arithmetic::{PerThing, Perbill, Percent, Perquintill, *};
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/// Tries to disprove `(n / d) * d <= n` for any `PerThing`s.
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fn main() {
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loop {
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fuzz!(|data: (u128, u128)| {
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let (n, d) = (data.0.min(data.1), data.0.max(data.1).max(1));
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check_mul::<PerU16>(n, d);
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check_mul::<Percent>(n, d);
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check_mul::<Perbill>(n, d);
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check_mul::<Perquintill>(n, d);
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check_reciprocal_mul::<PerU16>(n, d);
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check_reciprocal_mul::<Percent>(n, d);
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check_reciprocal_mul::<Perbill>(n, d);
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check_reciprocal_mul::<Perquintill>(n, d);
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})
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}
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}
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/// Checks that `(n / d) * d <= n`.
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fn check_mul<P: PerThing>(n: u128, d: u128)
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where
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P: PerThing + core::ops::Mul<u128, Output = u128>,
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{
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let q = P::from_rational_with_rounding(n, d, Rounding::Down).unwrap();
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assert!(q * d <= n, "{:?} * {:?} <= {:?}", q, d, n);
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}
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/// Checks that `n / (n / d) >= d`.
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fn check_reciprocal_mul<P: PerThing>(n: u128, d: u128)
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where
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P: PerThing + core::ops::Mul<u128, Output = u128>,
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{
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let q = P::from_rational_with_rounding(n, d, Rounding::Down).unwrap();
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if q.is_zero() {
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return;
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}
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let r = q.saturating_reciprocal_mul_floor(n);
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assert!(r >= d, "{} / ({} / {}) != {} but {}", n, n, d, d, r);
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}
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