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use memchr::Memchr; use rand::prelude::*; use std::{ cmp, convert::TryInto, fs::File, io, io::{prelude::*, Seek, SeekFrom}, path::PathBuf, }; pub struct Strfile { file: File, metadata: Vec<u8>, rng: SmallRng, } impl Strfile { pub fn new(strfile: &PathBuf, datfile: &PathBuf) -> io::Result<Self> { let mut datfile = File::open(datfile)?; let mut metadata = Vec::new(); datfile.read_to_end(&mut metadata)?; let file = File::open(strfile)?; let rng = SmallRng::from_entropy(); assert!(metadata.len() >= 32); Ok(Self { metadata, file, rng, }) } pub fn version(&self) -> u32 { u32::from_be_bytes(self.metadata[0..4].try_into().unwrap()) } pub fn count(&self) -> u32 { cmp::min( u32::from_be_bytes(self.metadata[4..8].try_into().unwrap()), (((self.metadata.len() - 24) / 4) - 1).try_into().unwrap(), ) } pub fn max_length(&self) -> u32 { u32::from_be_bytes(self.metadata[8..12].try_into().unwrap()) } pub fn min_length(&self) -> u32 { u32::from_be_bytes(self.metadata[12..14].try_into().unwrap()) } pub fn is_encrypted(&self) -> bool { u32::from_be_bytes(self.metadata[14..16].try_into().unwrap()) == 0x4 } pub fn delim(&self) -> char { char::from(self.metadata[20]) } pub fn random_quote(&mut self) -> io::Result<String> { let index = self.rng.gen_range(0, self.count() as usize); self.get_quote(index) } pub fn get_quote(&mut self, index: usize) -> io::Result<String> { let index = index * 4 + 24; let start = u32::from_be_bytes(self.metadata[index..index + 4].try_into().unwrap()) as usize; let end = u32::from_be_bytes(self.metadata[index + 4..index + 8].try_into().unwrap()) as usize; self.file.seek(SeekFrom::Start(start as u64))?; let mut buf = vec![0; end - start]; self.file.read_exact(&mut buf)?; let quote = String::from_utf8_lossy(&buf); Ok(quote .trim_matches(|c: char| self.delim() == c || c.is_whitespace()) .into()) } } pub fn build_dat_file(strfile: &[u8], delim: u8, flags: u32) -> Vec<u8> { let mut pointers: Vec<u32> = vec![0]; let mut x: Vec<u32> = Memchr::new(delim, strfile).map(|i| i as u32).collect(); pointers.append(&mut x); pointers.push(strfile.len() as u32); let mut max_length: u32 = 0; let mut min_length: u32 = std::u32::MAX; let mut x: Vec<u32> = pointers .iter() .zip(pointers.iter().skip(1)) .filter_map(|(a, b)| { let a = *a; let b = *b; if b > a && !String::from_utf8_lossy(&strfile[a as usize..b as usize]) .chars() .all(|c: char| delim as char == c || c.is_whitespace()) { let diff = (b - a) as u32; if diff > max_length { max_length = diff; } if diff < min_length { min_length = diff; } return Some(b); }; None }) .collect(); let mut pointers = vec![0]; pointers.append(&mut x); let version = u32::to_be_bytes(2); let count = u32::to_be_bytes(pointers.len() as u32); let max_length = u32::to_be_bytes(max_length); let min_length = u32::to_be_bytes(min_length); let flags = u32::to_be_bytes(flags); let del = [delim, 0, 0, 0]; let mut out = Vec::new(); out.extend_from_slice(&version); out.extend_from_slice(&count); out.extend_from_slice(&max_length); out.extend_from_slice(&min_length); out.extend_from_slice(&flags); out.extend_from_slice(&del); pointers .iter() .for_each(|i| out.extend_from_slice(&u32::to_be_bytes(*i))); out }