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is_binary_content

perl_parser::compat::source_file

Function is_binary_content 

Source 
pub fn is_binary_content(text: &str) -> bool
Expand description

Returns true if text appears to contain binary (non-text) content.

The heuristic checks the first [BINARY_PROBE_BYTES] bytes for null bytes (\0). A single null byte is sufficient to classify the content as binary: valid Perl (or any UTF-8 text) never contains null bytes outside of raw string literals, and real-world binary formats (ELF, PE/COFF, ZIP, PNG, …) all begin with or contain null bytes in their headers.

§Why null bytes?

  • Fast: a single memchr-style scan of at most 4 KB.
  • Low false-positive rate: Perl source virtually never contains \0.
  • High true-positive rate: every common compiled binary contains \0.