mod content_match;
mod content_search_result;
mod needle;
pub use {
crate::content_type::{self, extensions, magic_numbers},
content_match::ContentMatch,
content_search_result::ContentSearchResult,
needle::Needle,
std::io::{ BufRead, BufReader},
};
use {
memmap2::Mmap,
std::{
fs::File,
io,
path::Path,
},
};
pub const DEFAULT_MAX_FILE_SIZE: usize = 10 * 1024 * 1024;
pub fn get_mmap<P: AsRef<Path>>(hay_path: P) -> io::Result<Mmap> {
let file = File::open(hay_path.as_ref())?;
let hay = unsafe { Mmap::map(&file)? };
Ok(hay)
}
pub fn get_mmap_if_suitable<P: AsRef<Path>>(hay_path: P, max_size: usize) -> io::Result<Option<Mmap>> {
if let Some(ext) = hay_path.as_ref().extension().and_then(|s| s.to_str()) {
if extensions::is_known_binary(ext) {
return Ok(None);
}
}
let hay = get_mmap(&hay_path)?;
if hay.len() > max_size || magic_numbers::is_known_binary(&hay) {
return Ok(None);
}
Ok(Some(hay))
}
pub fn is_path_suitable<P: AsRef<Path>>(path: P, max_size: usize) -> bool {
let path = path.as_ref();
let Ok(metadata) = path.metadata() else {
return false;
};
if metadata.len() > max_size as u64 {
return false;
}
content_type::is_file_text(path).unwrap_or(false)
}
pub fn line_count_at_pos<P: AsRef<Path>>(path: P, pos: usize) -> io::Result<usize> {
let mut reader = BufReader::new(File::open(path)?);
let mut line = String::new();
let mut line_count = 1;
let mut bytes_count = 0;
while reader.read_line(&mut line)? > 0 {
bytes_count += line.len();
if bytes_count >= pos {
return Ok(line_count);
}
line_count += 1;
line.clear();
}
Err(io::Error::new(io::ErrorKind::UnexpectedEof, "too short".to_string()))
}