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https://github.com/storytold/craft-libs.git
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aiongg
2eca9b3a53
hayro-postscript 0.1.0 is the token scanner hayro-cmap uses for the CMap streams PDFs embed. Its object reader skipped each `<<` or `>>` by calling itself again, so a stream holding a long run of `<` or `>` bytes recursed once per pair and aborted the process with a stack overflow. Vendor the crates.io package unchanged and patch `object::read` to skip those runs in a loop, returning the same next object as before. Wire it in like the other Hayro crates: workspace exclude, [patch.crates-io] entry, SOURCE.json with registry and local hashes, the backend test script, NOTICE, ATTRIBUTION.md and the reader README. Tests cover a million `<` and a million `>` bytes, `<< /A 1 >>` and nested `<<<< /X >>>>` runs.
31 lines
950 B
Rust
31 lines
950 B
Rust
//! Error types for the PostScript scanner.
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use core::fmt;
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/// A specialized [`Result`] type for PostScript scanner operations.
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pub type Result<T> = core::result::Result<T, Error>;
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/// An error encountered while scanning a PostScript token stream.
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#[derive(Debug, Clone, PartialEq, Eq)]
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pub enum Error {
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/// A syntax error in the input.
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SyntaxError,
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/// A numeric value exceeded implementation limits.
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LimitCheck,
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/// An unsupported PostScript type was encountered (like dictionaries or
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/// procedures, which will be added in the future).
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UnsupportedType,
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}
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match self {
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Self::SyntaxError => f.write_str("syntaxerror"),
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Self::LimitCheck => f.write_str("limitcheck"),
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Self::UnsupportedType => f.write_str("unsupported type"),
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}
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}
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}
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impl core::error::Error for Error {}
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