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Dylan M. Taylor
ee78a9bd46
PhotoCraft's `photocraft-psd` crate (crates/psd at storytold/photocraft 63b641b55e54bf8f5c83efd977fdb16a2c255431) as `craft-psd`: the lossless PSD/PSB model, reader, writer and builder, descriptors, the Photoshop resource files that share its primitives (.abr, .asl, .aco, .act, .ase, .grd, .pat, .atn, .csh, .shc) and the Photoshop blocks of a layered TIFF. The crate had no dependency on any other PhotoCraft crate. Code is unchanged apart from the crate name, craft-libs' rustfmt width, comments that named other PhotoCraft crates, issue references (now `photocraft#N`), and the corpus tests' directory (`CRAFT_PSD_CORPUS` or `corpus/` at the workspace root). Tests, proptests, fuzz targets and fixtures move with it. Part of #778, #786.
18 lines
1.0 KiB
Rust
18 lines
1.0 KiB
Rust
//! Fuzz the `shmd` (metadata setting) parser: any input must return `Ok` or `Err`, never panic.
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//!
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//! The `copy` field is a bool, so a non-canonical copy byte (anything but 0 or 1) normalises to 1
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//! on write; exact byte equality therefore cannot hold for arbitrary input, only for canonical
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//! files. The invariant that does hold, and that catches reader/writer drift, is that a
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//! parsed-then-written block re-parses to the *same items* (semantic equality, not just byte
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//! stability -- byte stability alone would also pass if the writer silently dropped a field).
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#![no_main]
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use libfuzzer_sys::fuzz_target;
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use craft_psd::metadata::{parse_shmd, write_shmd};
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fuzz_target!(|data: &[u8]| {
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let Ok(items) = parse_shmd(data) else { return };
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let out = write_shmd(&items);
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let back = parse_shmd(&out).expect("a written shmd block must re-parse");
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assert_eq!(back, items, "a written shmd block does not re-parse to the same items");
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assert_eq!(write_shmd(&back), out, "shmd is not byte-stable across a round trip");
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});
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