Implement splash screen feature.

deps/simd-adler32/src/hash.rs

@@ -0,0 +1,156 @@
+use crate::{Adler32, Adler32Hash};
+
+impl Adler32Hash for &[u8] {
+  fn hash(&self) -> u32 {
+    let mut hash = Adler32::new();
+
+    hash.write(self);
+    hash.finish()
+  }
+}
+
+impl Adler32Hash for &str {
+  fn hash(&self) -> u32 {
+    let mut hash = Adler32::new();
+
+    hash.write(self.as_bytes());
+    hash.finish()
+  }
+}
+
+#[cfg(feature = "const-generics")]
+impl<const SIZE: usize> Adler32Hash for [u8; SIZE] {
+  fn hash(&self) -> u32 {
+    let mut hash = Adler32::new();
+
+    hash.write(self);
+    hash.finish()
+  }
+}
+
+macro_rules! array_impl {
+  ($s:expr, $($size:expr),+) => {
+    array_impl!($s);
+    $(array_impl!{$size})*
+  };
+  ($size:expr) => {
+    #[cfg(not(feature = "const-generics"))]
+    impl Adler32Hash for [u8; $size] {
+      fn hash(&self) -> u32 {
+        let mut hash = Adler32::new();
+
+        hash.write(self);
+        hash.finish()
+      }
+    }
+  };
+}
+
+array_impl!(
+  0,
+  1,
+  2,
+  3,
+  4,
+  5,
+  6,
+  7,
+  8,
+  9,
+  10,
+  11,
+  12,
+  13,
+  14,
+  15,
+  16,
+  17,
+  18,
+  19,
+  20,
+  21,
+  22,
+  23,
+  24,
+  25,
+  26,
+  27,
+  28,
+  29,
+  30,
+  31,
+  32,
+  33,
+  34,
+  35,
+  36,
+  37,
+  38,
+  39,
+  40,
+  41,
+  42,
+  43,
+  44,
+  45,
+  46,
+  47,
+  48,
+  49,
+  50,
+  51,
+  52,
+  53,
+  54,
+  55,
+  56,
+  57,
+  58,
+  59,
+  60,
+  61,
+  62,
+  63,
+  64,
+  65,
+  66,
+  67,
+  68,
+  69,
+  70,
+  71,
+  72,
+  73,
+  74,
+  75,
+  76,
+  77,
+  78,
+  79,
+  80,
+  81,
+  82,
+  83,
+  84,
+  85,
+  86,
+  87,
+  88,
+  89,
+  90,
+  91,
+  92,
+  93,
+  94,
+  95,
+  96,
+  97,
+  98,
+  99,
+  100,
+  1024,
+  1024 * 1024,
+  1024 * 1024 * 1024,
+  2048,
+  4096
+);

deps/simd-adler32/src/imp/mod.rs

@@ -0,0 +1,13 @@
+pub mod scalar;
+
+pub type Adler32Imp = fn(u16, u16, &[u8]) -> (u16, u16);
+
+#[inline]
+#[allow(non_snake_case)]
+pub const fn _MM_SHUFFLE(z: u32, y: u32, x: u32, w: u32) -> i32 {
+  ((z << 6) | (y << 4) | (x << 2) | w) as i32
+}
+
+pub fn get_imp() -> Adler32Imp {
+  scalar::update
+}

deps/simd-adler32/src/imp/scalar.rs

@@ -0,0 +1,69 @@
+const MOD: u32 = 65521;
+const NMAX: usize = 5552;
+
+pub fn update(a: u16, b: u16, data: &[u8]) -> (u16, u16) {
+  let mut a = a as u32;
+  let mut b = b as u32;
+
+  let chunks = data.chunks_exact(NMAX);
+  let remainder = chunks.remainder();
+
+  for chunk in chunks {
+    for byte in chunk {
+      a = a.wrapping_add(*byte as _);
+      b = b.wrapping_add(a);
+    }
+
+    a %= MOD;
+    b %= MOD;
+  }
+
+  for byte in remainder {
+    a = a.wrapping_add(*byte as _);
+    b = b.wrapping_add(a);
+  }
+
+  a %= MOD;
+  b %= MOD;
+
+  (a as u16, b as u16)
+}
+
+#[cfg(test)]
+mod tests {
+  #[test]
+  fn zeroes() {
+    assert_eq!(adler32(&[]), 1);
+    assert_eq!(adler32(&[0]), 1 | 1 << 16);
+    assert_eq!(adler32(&[0, 0]), 1 | 2 << 16);
+    assert_eq!(adler32(&[0; 100]), 0x00640001);
+    assert_eq!(adler32(&[0; 1024]), 0x04000001);
+    assert_eq!(adler32(&[0; 1024 * 1024]), 0x00f00001);
+  }
+
+  #[test]
+  fn ones() {
+    assert_eq!(adler32(&[0xff; 1024]), 0x79a6fc2e);
+    assert_eq!(adler32(&[0xff; 1024 * 1024]), 0x8e88ef11);
+  }
+
+  #[test]
+  fn mixed() {
+    assert_eq!(adler32(&[1]), 2 | 2 << 16);
+    assert_eq!(adler32(&[40]), 41 | 41 << 16);
+
+    assert_eq!(adler32(&[0xA5; 1024 * 1024]), 0xd5009ab1);
+  }
+
+  /// Example calculation from https://en.wikipedia.org/wiki/Adler-32.
+  #[test]
+  fn wiki() {
+    assert_eq!(adler32(b"Wikipedia"), 0x11E60398);
+  }
+
+  fn adler32(data: &[u8]) -> u32 {
+    let (a, b) = super::update(1, 0, data);
+
+    u32::from(b) << 16 | u32::from(a)
+  }
+}

deps/simd-adler32/src/lib.rs

@@ -0,0 +1,309 @@
+//! # simd-adler32
+//!
+//! A SIMD-accelerated Adler-32 hash algorithm implementation.
+//!
+//! ## Features
+//!
+//! - No dependencies
+//! - Support `no_std` (with `default-features = false`)
+//! - Runtime CPU feature detection (when `std` enabled)
+//! - Blazing fast performance on as many targets as possible (currently only x86 and x86_64)
+//! - Default to scalar implementation when simd not available
+//!
+//! ## Quick start
+//!
+//! > Cargo.toml
+//!
+//! ```toml
+//! [dependencies]
+//! simd-adler32 = "*"
+//! ```
+//!
+//! > example.rs
+//!
+//! ```rust
+//! use simd_adler32::Adler32;
+//!
+//! let mut adler = Adler32::new();
+//! adler.write(b"rust is pretty cool, man");
+//! let hash = adler.finish();
+//!
+//! println!("{}", hash);
+//! // 1921255656
+//! ```
+//!
+//! ## Feature flags
+//!
+//! * `std` - Enabled by default
+//!
+//! Enables std support, see [CPU Feature Detection](#cpu-feature-detection) for runtime
+//! detection support.
+//! * `nightly`
+//!
+//! Enables nightly features required for avx512 support.
+//!
+//! * `const-generics` - Enabled by default
+//!
+//! Enables const-generics support allowing for user-defined array hashing by value.  See
+//! [`Adler32Hash`] for details.
+//!
+//! ## Support
+//!
+//! **CPU Features**
+//!
+//! | impl | arch             | feature |
+//! | ---- | ---------------- | ------- |
+//! | ✅   | `x86`, `x86_64`  | avx512  |
+//! | ✅   | `x86`, `x86_64`  | avx2    |
+//! | ✅   | `x86`, `x86_64`  | ssse3   |
+//! | ✅   | `x86`, `x86_64`  | sse2    |
+//! | 🚧   | `arm`, `aarch64` | neon    |
+//! |      | `wasm32`         | simd128 |
+//!
+//! **MSRV** `1.36.0`\*\*
+//!
+//! Minimum supported rust version is tested before a new version is published. [**] Feature
+//! `const-generics` needs to disabled to build on rustc versions `<1.51` which can be done
+//! by updating your dependency definition to the following.
+//!
+//! ## CPU Feature Detection
+//! simd-adler32 supports both runtime and compile time CPU feature detection using the
+//! `std::is_x86_feature_detected` macro when the `Adler32` struct is instantiated with
+//! the `new` fn.  
+//!
+//! Without `std` feature enabled simd-adler32 falls back to compile time feature detection
+//! using `target-feature` or `target-cpu` flags supplied to rustc. See [https://rust-lang.github.io/packed_simd/perf-guide/target-feature/rustflags.html](https://rust-lang.github.io/packed_simd/perf-guide/target-feature/rustflags.html)
+//! for more information.
+//!
+//! Feature detection tries to use the fastest supported feature first.
+#![cfg_attr(not(feature = "std"), no_std)]
+#![cfg_attr(feature = "nightly", feature(stdsimd, avx512_target_feature))]
+
+#[doc(hidden)]
+pub mod hash;
+#[doc(hidden)]
+pub mod imp;
+
+use imp::{get_imp, Adler32Imp};
+
+/// An adler32 hash generator type.
+#[derive(Clone)]
+pub struct Adler32 {
+  a: u16,
+  b: u16,
+  update: Adler32Imp,
+}
+
+impl Adler32 {
+  /// Constructs a new `Adler32`.
+  ///
+  /// Potential overhead here due to runtime feature detection although in testing on 100k
+  /// and 10k random byte arrays it was not really noticeable.
+  ///
+  /// # Examples
+  /// ```rust
+  /// use simd_adler32::Adler32;
+  ///
+  /// let mut adler = Adler32::new();
+  /// ```
+  pub fn new() -> Self {
+    Default::default()
+  }
+
+  /// Constructs a new `Adler32` using existing checksum.
+  ///
+  /// Potential overhead here due to runtime feature detection although in testing on 100k
+  /// and 10k random byte arrays it was not really noticeable.
+  ///
+  /// # Examples
+  /// ```rust
+  /// use simd_adler32::Adler32;
+  ///
+  /// let mut adler = Adler32::from_checksum(0xdeadbeaf);
+  /// ```
+  pub fn from_checksum(checksum: u32) -> Self {
+    Self {
+      a: checksum as u16,
+      b: (checksum >> 16) as u16,
+      update: get_imp(),
+    }
+  }
+
+  /// Computes hash for supplied data and stores results in internal state.
+  pub fn write(&mut self, data: &[u8]) {
+    let (a, b) = (self.update)(self.a, self.b, data);
+
+    self.a = a;
+    self.b = b;
+  }
+
+  /// Returns the hash value for the values written so far.
+  ///
+  /// Despite its name, the method does not reset the hasher’s internal state. Additional
+  /// writes will continue from the current value. If you need to start a fresh hash
+  /// value, you will have to use `reset`.
+  pub fn finish(&self) -> u32 {
+    (u32::from(self.b) << 16) | u32::from(self.a)
+  }
+
+  /// Resets the internal state.
+  pub fn reset(&mut self) {
+    self.a = 1;
+    self.b = 0;
+  }
+}
+
+/// Compute Adler-32 hash on `Adler32Hash` type.
+///
+/// # Arguments
+/// * `hash` - A Adler-32 hash-able type.
+///
+/// # Examples
+/// ```rust
+/// use simd_adler32::adler32;
+///
+/// let hash = adler32(b"Adler-32");
+/// println!("{}", hash); // 800813569
+/// ```
+pub fn adler32<H: Adler32Hash>(hash: &H) -> u32 {
+  hash.hash()
+}
+
+/// A Adler-32 hash-able type.
+pub trait Adler32Hash {
+  /// Feeds this value into `Adler32`.
+  fn hash(&self) -> u32;
+}
+
+impl Default for Adler32 {
+  fn default() -> Self {
+    Self {
+      a: 1,
+      b: 0,
+      update: get_imp(),
+    }
+  }
+}
+
+#[cfg(feature = "std")]
+pub mod read {
+  //! Reader-based hashing.
+  //!
+  //! # Example
+  //! ```rust
+  //! use std::io::Cursor;
+  //! use simd_adler32::read::adler32;
+  //!
+  //! let mut reader = Cursor::new(b"Hello there");
+  //! let hash = adler32(&mut reader).unwrap();
+  //!
+  //! println!("{}", hash) // 800813569
+  //! ```
+  use crate::Adler32;
+  use std::io::{Read, Result};
+
+  /// Compute Adler-32 hash on reader until EOF.
+  ///
+  /// # Example
+  /// ```rust
+  /// use std::io::Cursor;
+  /// use simd_adler32::read::adler32;
+  ///
+  /// let mut reader = Cursor::new(b"Hello there");
+  /// let hash = adler32(&mut reader).unwrap();
+  ///
+  /// println!("{}", hash) // 800813569
+  /// ```
+  pub fn adler32<R: Read>(reader: &mut R) -> Result<u32> {
+    let mut hash = Adler32::new();
+    let mut buf = [0; 4096];
+
+    loop {
+      match reader.read(&mut buf) {
+        Ok(0) => return Ok(hash.finish()),
+        Ok(n) => {
+          hash.write(&buf[..n]);
+        }
+        Err(err) => return Err(err),
+      }
+    }
+  }
+}
+
+#[cfg(feature = "std")]
+pub mod bufread {
+  //! BufRead-based hashing.
+  //!
+  //! Separate `BufRead` trait implemented to allow for custom buffer size optimization.
+  //!
+  //! # Example
+  //! ```rust
+  //! use std::io::{Cursor, BufReader};
+  //! use simd_adler32::bufread::adler32;
+  //!
+  //! let mut reader = Cursor::new(b"Hello there");
+  //! let mut reader = BufReader::new(reader);
+  //! let hash = adler32(&mut reader).unwrap();
+  //!
+  //! println!("{}", hash) // 800813569
+  //! ```
+  use crate::Adler32;
+  use std::io::{BufRead, ErrorKind, Result};
+
+  /// Compute Adler-32 hash on buf reader until EOF.
+  ///
+  /// # Example
+  /// ```rust
+  /// use std::io::{Cursor, BufReader};
+  /// use simd_adler32::bufread::adler32;
+  ///
+  /// let mut reader = Cursor::new(b"Hello there");
+  /// let mut reader = BufReader::new(reader);
+  /// let hash = adler32(&mut reader).unwrap();
+  ///
+  /// println!("{}", hash) // 800813569
+  /// ```
+  pub fn adler32<R: BufRead>(reader: &mut R) -> Result<u32> {
+    let mut hash = Adler32::new();
+
+    loop {
+      let consumed = match reader.fill_buf() {
+        Ok(buf) => {
+          if buf.is_empty() {
+            return Ok(hash.finish());
+          }
+
+          hash.write(buf);
+          buf.len()
+        }
+        Err(err) => match err.kind() {
+          ErrorKind::Interrupted => continue,
+          ErrorKind::UnexpectedEof => return Ok(hash.finish()),
+          _ => return Err(err),
+        },
+      };
+
+      reader.consume(consumed);
+    }
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  #[test]
+  fn test_from_checksum() {
+    let buf = b"rust is pretty cool man";
+    let sum = 0xdeadbeaf;
+
+    let mut simd = super::Adler32::from_checksum(sum);
+    let mut adler = adler::Adler32::from_checksum(sum);
+
+    simd.write(buf);
+    adler.write_slice(buf);
+
+    let simd = simd.finish();
+    let scalar = adler.checksum();
+
+    assert_eq!(simd, scalar);
+  }
+}