48 lines
1.8 KiB
Rust
48 lines
1.8 KiB
Rust
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#![no_main]
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//! Fuzz market-breadth `Indicator<Input = CrossSection>` implementations with
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//! arbitrary cross-section streams.
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//!
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//! Each iteration consumes a byte stream, interprets it as a sequence of `f64`
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//! values (8 bytes each), packs consecutive pairs into [`Member`]s (a `change`
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//! and a `volume`, with the high/low flags taken from the value bit parity), and
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//! groups the members into bounded-size [`CrossSection`] ticks. Cross-sections
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//! are built with `new_unchecked` so the fuzzer can explore degenerate values
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//! (non-finite changes, negative volumes, empty-adjacent groups) that the
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//! validating constructor would reject — the indicators must never panic,
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//! streaming or batched.
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use libfuzzer_sys::fuzz_target;
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use wickra_core::{AdvanceDecline, BatchExt, CrossSection, Indicator, Member};
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#[inline(never)]
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fn drive<I>(make: impl Fn() -> I, sections: &[CrossSection])
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where
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I: Indicator<Input = CrossSection, Output = f64> + BatchExt,
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{
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let mut streaming = make();
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for section in sections {
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let _ = streaming.update(section.clone());
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}
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let _ = make().batch(sections);
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}
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fuzz_target!(|data: &[u8]| {
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let floats: Vec<f64> = data
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.chunks_exact(8)
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.map(|c| f64::from_le_bytes(c.try_into().expect("8 bytes")))
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.collect();
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let members: Vec<Member> = floats
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.chunks_exact(2)
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.map(|c| Member::new(c[0], c[1], c[0].to_bits() & 1 == 1, c[1].to_bits() & 1 == 1))
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.collect();
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// Group members into cross-sections of up to eight symbols each so a single
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// input yields a stream of ragged universes.
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let sections: Vec<CrossSection> = members
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.chunks(8)
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.filter(|chunk| !chunk.is_empty())
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.map(|chunk| CrossSection::new_unchecked(chunk.to_vec(), 0))
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.collect();
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drive(AdvanceDecline::new, §ions);
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});
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