Module io 

Enums

FileData

Holds file data — either zero-copy mmap or an owned Vec. Dereferences to &[u8] for transparent use.

Functions

file_size

Get file size without reading it (for byte-count-only optimization).

read_file

Read a file with zero-copy mmap for large files or read() for small files. Opens once with O_NOATIME, uses fstat for metadata to save a syscall.

read_stdin

Read all bytes from stdin into a Vec. Pre-allocates 16MB to avoid the repeated reallocation overhead of Vec’s default growth strategy (which doubles from 0 -> 8K -> 16K -> …), causing multiple memcpy of already-read data for large piped inputs.