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437 lines
11 KiB
437 lines
11 KiB
//! Extensions
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use std::{
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fmt,
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error,
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pin::Pin,
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task::{Poll,Context,},
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};
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use tokio::{
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io::AsyncRead,
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prelude::*,
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};
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use futures::future::Future;
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pub trait JoinStrsExt: Sized
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{
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/// Join an iterator of `str` with a seperator
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fn join(self, with: &str) -> String;
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}
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impl<T,I> JoinStrsExt for I
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where I: Iterator<Item=T>,
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T: AsRef<str>
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{
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fn join(self, with: &str) -> String
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{
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let mut output = String::new();
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let mut first=true;
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for string in self
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{
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if !first {
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output.push_str(with);
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}
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let string = string.as_ref();
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output.push_str(string);
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first=false;
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}
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output
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}
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}
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/*macro_rules! typed_swap {
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(@ [] $($reversed:tt)*) => {
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fn swap(self) -> ($($reversed)*);
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};
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(@ [$first:tt $($rest:tt)*] $($reversed:tt)*) => {
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typed_swap!{@ [$($rest)*] $first $($reversed)*}
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};
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(@impl {$($body:tt)*} [] $($reversed:tt)*) => {
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fn swap(self) -> ($($reversed)*)
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{
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$($body)*
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}
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};
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(@impl {$($body:tt)*} [$first:tt $($rest:tt)*] $($reversed:tt)*) => {
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typed_swap!{@impl {$($body)*} [$($rest)*] $first $($reversed)*}
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};
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() => {};
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({$($params:tt)*} $($rest:tt)*) => {
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mod swap {
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pub trait SwapTupleExt<$($params)*>: Sized
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{
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typed_swap!(@ [$($params)*]);
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}
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impl<$($params)*> SwapTupleExt<$($params)*> for ($($params)*)
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{
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typed_swap!(@impl {
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todo!()
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} [$($params)*]);
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}
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typed_swap!($($rest)*);
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}
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pub use swap::*;
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};
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(all $first:tt $($params:tt)+) => {
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typed_swap!({$first, $($params),+});
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mod nswap {
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typed_swap!(all $($params)+);
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}
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};
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(all $($one:tt)?) => {};
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}
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typed_swap!(all A B C D E F G H I J K L M N O P Q R S T U V W X Y Z);
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pub use swap::*;
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fn test()
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{
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let sw = (1, 2).swap();
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}*/
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// ^ unfortunately not lol
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pub trait SwapTupleExt<T,U>: Sized
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{
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fn swap(self) -> (U,T);
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}
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impl<T,U> SwapTupleExt<T,U> for (T,U)
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{
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#[inline(always)] fn swap(self) -> (U,T) {
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(self.1, self.0)
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}
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}
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/*typed_swap!({A, B}
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{A, U, V}
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{T, U, V, W});*/
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const ASCII_MAP: [char; 256] = [
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'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.',
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'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.',
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'.', '!', '"', '#', '$', '%', '&', '\'', '(', ')', '*', '+', ',', '-', '.', '/',
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?',
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'@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '[', '\\', ']', '^', '_',
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'`', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
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'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '{', '|', '}', '~', '.',
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'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.',
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'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.',
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'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.',
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'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.',
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'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.',
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'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.',
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'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.',
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'.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.',
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];
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pub struct HexStringIter<'a, I>(&'a I, bool);
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pub struct HexView<'a, I>(&'a I);
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const SPLIT_EVERY: usize = 16;
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impl<'a, I: AsRef<[u8]>> fmt::Display for HexView<'a, I>
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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use std::iter;
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let mut abuf = ['\0'; SPLIT_EVERY];
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let mut last_n =0 ;
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for (i, (n, &byte)) in (0..).zip(iter::repeat(0..SPLIT_EVERY).flatten().zip(self.0.as_ref().iter()))
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{
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if n== 0 {
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write!(f,"0x{:016x}\t", i)?;
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}
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abuf[n] = ASCII_MAP[byte as usize];
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write!(f, "{:02x} ", byte)?;
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if n==SPLIT_EVERY-1 {
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write!(f, "\t\t")?;
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for ch in abuf.iter().filter(|&x| *x!= '\0')
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{
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write!(f, "{}", ch)?;
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}
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writeln!(f)?;
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abuf = ['\0'; SPLIT_EVERY];
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}
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last_n = n;
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}
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if last_n != SPLIT_EVERY-1
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{
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for _ in 0..(SPLIT_EVERY-last_n)
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{
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write!(f, " ")?;
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}
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write!(f, "\t\t")?;
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for ch in abuf.iter().filter(|&x| *x!= '\0')
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{
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write!(f, "{}", ch)?;
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}
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writeln!(f)?;
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}
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Ok(())
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}
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}
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impl<'a, I: AsRef<[u8]>> fmt::Display for HexStringIter<'a, I>
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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if self.1 {
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let mut iter = self.0.as_ref().iter();
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if let Some(byte) = iter.next()
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{
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write!(f, "{:02}", byte)?;
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} else {
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return Ok(())
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}
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for byte in iter {
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write!(f, " {:02x}", byte)?;
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}
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} else {
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for byte in self.0.as_ref().iter() {
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write!(f, "{:02x}", byte)?;
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}
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}
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Ok(())
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}
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}
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pub trait HexStringExt: Sized + AsRef<[u8]>
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{
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fn fmt_view(&self) -> HexView<'_, Self>;
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fn fmt_hex(&self) -> HexStringIter<'_, Self>;
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fn to_hex_string(&self) -> String
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{
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let mut string = String::with_capacity(self.as_ref().len()*2);
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use fmt::Write;
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write!(&mut string, "{}", self.fmt_hex()).unwrap();
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string
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}
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fn to_broken_hex_string(&self) -> String
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{
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let fmt = HexStringIter(
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self.fmt_hex().0,
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true
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);
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let mut string = String::with_capacity(self.as_ref().len()*3);
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use fmt::Write;
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write!(&mut string, "{}", fmt).unwrap();
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string
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}
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}
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impl<T: AsRef<[u8]>> HexStringExt for T
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{
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fn fmt_hex(&self) -> HexStringIter<'_, Self>
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{
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HexStringIter(&self, false)
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}
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fn fmt_view(&self) -> HexView<'_, Self>
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{
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HexView(&self)
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}
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}
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#[pin_project]
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pub struct ReadAllBytes<'a, T: AsyncRead+Unpin+?Sized>(#[pin] &'a mut T, Option<usize>);
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impl<'a, T: AsyncRead+Unpin+?Sized> Future for ReadAllBytes<'a, T>
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{
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type Output = std::io::Result<Vec<u8>>;
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fn poll(self: Pin<&mut Self>, ctx: &mut Context) -> Poll<Self::Output>
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{
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let fut = async move {
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let this = self.project();
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let mut output = Vec::with_capacity(4096*10);
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let mut input = this.0;
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let max = *this.1;
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let mut buffer =[0u8; 4096];
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let mut read;
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while {read = input.read(&mut buffer[..]).await?; read!=0} {
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output.extend_from_slice(&buffer[..read]);
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if let Some(max) = max {
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if output.len() >=max {
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return Err(std::io::Error::new(std::io::ErrorKind::Other, format!("Attempted to read more than allowed max {} bytes", max)));
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}
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}
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}
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Ok(output)
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};
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tokio::pin!(fut);
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fut.poll(ctx)
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}
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}
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pub trait ReadAllBytesExt: AsyncRead+Unpin
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{
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/// Attempt to read the whole stream to a new `Vec<u8>`.
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fn read_whole_stream(&mut self, max: Option<usize>) -> ReadAllBytes<'_, Self>
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{
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ReadAllBytes(self, max)
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}
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}
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impl<T: AsyncRead+Unpin+?Sized> ReadAllBytesExt for T{}
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pub trait FromHexExt
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{
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fn repl_with_hex<U: AsRef<[u8]>>(&mut self, input: U) -> Result<(), HexDecodeError>;
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}
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impl<T: AsMut<[u8]>+?Sized> FromHexExt for T
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{
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fn repl_with_hex<U: AsRef<[u8]>>(&mut self, input: U) -> Result<(), HexDecodeError> {
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let out = self.as_mut();
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#[inline] fn val(c: u8, idx: usize) -> Result<u8, HexDecodeError> {
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match c {
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b'A'..=b'F' => Ok(c - b'A' + 10),
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b'a'..=b'f' => Ok(c - b'a' + 10),
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b'0'..=b'9' => Ok(c - b'0'),
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_ => Err(HexDecodeError{
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chr: c as char,
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idx,
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}),
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}
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}
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for (i, (byte, digits)) in (0..).zip(out.iter_mut().zip(input.as_ref().chunks_exact(2)))
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{
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*byte = val(digits[0], 2*i)? << 4 | val(digits[1], 2 * i + 1)?;
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}
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Ok(())
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}
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}
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#[derive(Debug)]
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pub struct HexDecodeError {
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idx: usize,
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chr: char,
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}
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impl error::Error for HexDecodeError{}
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impl fmt::Display for HexDecodeError
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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write!(f, "Invalid hex at index {} (character was {:?})", self.idx, self.chr)
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}
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}
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#[cfg(test)]
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mod tests
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{
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use super::*;
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fn format()
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{
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let bytes = b"hello world one two three \x142!";
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panic!("\n{}\n", bytes.fmt_view());
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}
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#[test]
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fn hex()
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{
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const INPUT_HEX: [u8; 32] = hex_literal::hex!("d0a2404173bac722b29282652f2c457b573261e3c8701b908bb0bd3ada3d7f2d");
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const INPUT_STR: &str = "d0a2404173bac722b29282652f2c457b573261e3c8701b908bb0bd3ada3d7f2d";
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let mut output = [0u8; 32];
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output.repl_with_hex(INPUT_STR).expect("Failed!");
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assert_eq!(&INPUT_HEX[..], &output[..]);
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}
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#[cfg(nightly)]
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mod benchmarks
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{
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use super::*;
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use test::{Bencher, black_box};
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#[bench]
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fn hex_via_val(b: &mut Bencher)
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{
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fn repl_with_hex<U: AsRef<[u8]>>(out: &mut [u8], input: U) -> Result<(), HexDecodeError> {
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#[inline] fn val(c: u8, idx: usize) -> Result<u8, HexDecodeError> {
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match c {
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b'A'..=b'F' => Ok(c - b'A' + 10),
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b'a'..=b'f' => Ok(c - b'a' + 10),
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b'0'..=b'9' => Ok(c - b'0'),
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_ => Err(HexDecodeError{
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chr: c as char,
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idx,
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}),
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}
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}
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for (i, (byte, digits)) in (0..).zip(out.iter_mut().zip(input.as_ref().chunks_exact(2)))
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{
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*byte = val(digits[0], 2*i)? << 4 | val(digits[1], 2 * i + 1)?;
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}
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Ok(())
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}
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const INPUT_HEX: [u8; 32] = hex_literal::hex!("d0a2404173bac722b29282652f2c457b573261e3c8701b908bb0bd3ada3d7f2d");
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const INPUT_STR: &str = "d0a2404173bac722b29282652f2c457b573261e3c8701b908bb0bd3ada3d7f2d";
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let mut output = [0u8; 32];
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b.iter(|| {
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black_box(repl_with_hex(&mut output[..], INPUT_STR).unwrap());
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});
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assert_eq!(&INPUT_HEX[..], &output[..]);
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}
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#[bench]
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fn hex_via_lazy(b: &mut Bencher)
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{
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fn repl_with_hex<U: AsRef<[u8]>>(out: &mut [u8], input: U) -> Result<(), HexDecodeError> {
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use smallmap::Map;
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lazy_static::lazy_static! {
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static ref MAP: Map<u8, u8> = {
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let mut map = Map::new();
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for c in 0..=255u8
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{
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map.insert(c, match c {
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b'A'..=b'F' => c - b'A' + 10,
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b'a'..=b'f' => c - b'a' + 10,
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b'0'..=b'9' => c - b'0',
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_ => continue,
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});
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}
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map
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};
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}
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#[inline(always)] fn val(c: u8, idx: usize) -> Result<u8, HexDecodeError> {
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MAP.get(&c).copied()
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.ok_or_else(|| HexDecodeError{idx, chr: c as char})
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}
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for (i, (byte, digits)) in (0..).zip(out.iter_mut().zip(input.as_ref().chunks_exact(2)))
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{
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*byte = val(digits[0], 2*i)? << 4 | val(digits[1], 2 * i + 1)?;
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}
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Ok(())
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}
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const INPUT_HEX: [u8; 32] = hex_literal::hex!("d0a2404173bac722b29282652f2c457b573261e3c8701b908bb0bd3ada3d7f2d");
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const INPUT_STR: &str = "d0a2404173bac722b29282652f2c457b573261e3c8701b908bb0bd3ada3d7f2d";
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let mut output = [0u8; 32];
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b.iter(|| {
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black_box(repl_with_hex(&mut output[..], INPUT_STR).unwrap());
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});
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assert_eq!(&INPUT_HEX[..], &output[..]);
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}
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}
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}
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