Effectively working interface.

Fortune for phash's current commit: Great blessing − 大吉

Cargo.toml

@@ -6,9 +6,9 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-atomic_refcell = "0.1.8"
+#atomic_refcell = "0.1.8"
+bytes = "1.1.0"
 digest = "0.10.3"
-parking_lot = { version = "0.12.0", features = ["hardware-lock-elision", "arc_lock"] }
+#parking_lot = { version = "0.12.0", features = ["hardware-lock-elision", "arc_lock"] }
 rayon = "1.5.2"
 sha2 = "0.10.2"
-smallmap = "1.3.3"

src/encode.rs

@@ -3,10 +3,7 @@ use std::fmt::{
     self,
     Write,
 };
-use smallmap::{
+
-    Primitive,
-    Map,
-};
 pub trait Encoder
 {
     fn encode_byte<W: Write + ?Sized>(&self, byte: u8, f: &mut W) -> fmt::Result;

src/ext.rs

@@ -0,0 +1,49 @@
+//! Extensions
+use bytes::Buf;
+use std::io::BufRead;
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct BufIter<B: ?Sized>(B);
+
+pub trait BufIterExt
+{
+    fn chunks_iter(self) -> BufIter<Self>;
+}
+
+impl<T: ?Sized + Buf> Iterator for BufIter<T>
+{
+    type Item = bytes::Bytes;
+    fn next(&mut self) -> Option<Self::Item>
+    {
+	if self.0.has_remaining() {
+	    Some(self.0.copy_to_bytes(self.0.chunk().len()))
+	} else {
+	    None
+	}
+    }
+}
+
+impl<B: Buf> BufIterExt for B
+{
+    fn chunks_iter(self) -> BufIter<Self> {
+	BufIter(self)
+    }
+}
+
+/*
+pub struct BufReadIter<B: ?Sized>(usize, B);
+
+pub trait BufReadExt
+{
+    fn chunks_iter(self, sz: usize) -> BufReadIter<Self>;
+}
+
+impl<B: ?Sized + BufRead> Iterator for BufReadIter<B>
+{
+    type Item = bytes::Bytes;
+    fn next(&mut self) -> Option<Self::Item>
+    {
+	self.1.read_exact(buf)
+    }
+}
+*/

src/hash.rs

@@ -2,18 +2,150 @@
 //use super::pool;
 use digest::{
     Digest,
-    DynDigest,
     Output,
 };
-use std::marker::PhantomData;
+use std::fmt;
-use std::{
+use bytes::Buf;
-    fmt,
-};
 
 #[derive(Debug, Clone, PartialEq, Eq)]
-pub struct ParallelDigest<D: Digest + Send + Sync>(usize, PhantomData<fn () -> D>);
+pub struct ParallelDigest<D: Digest + Send + Sync>{
+    chunk_size: usize,
+    completed: ParallelHash<D>,
+    last_slice: Vec<u8>,
+}
+
+#[derive(Debug, Clone, Hash)]
+pub struct ParallelHash<D: Digest>(Vec<Output<D>>, usize);
+
+
+impl<D: Digest> Eq for ParallelHash<D>{}
+impl<D: Digest> PartialEq for ParallelHash<D>
+{
+    fn eq(&self, other: &Self) -> bool
+    {
+	self.1 == other.1 && self.0.iter().map(|x| &x[..]).eq(other.0.iter().map(|x| &x[..]))
+    }
+}
+
+
+#[derive(Debug, Clone, Hash)]
+pub struct ParallelHashOutput<D: Digest>(usize, Output<D>);
+
+impl<D: Digest> Eq for ParallelHashOutput<D>{}
+impl<D: Digest> PartialEq for ParallelHashOutput<D>
+{
+    fn eq(&self, other: &Self) -> bool
+    {
+	self.0 == other.0 && &self.1[..] == &other.1[..]
+    }
+}
+
+impl<D: Digest> ParallelHashOutput<D>
+{
+    #[inline] 
+    pub fn chunk_size(&self) -> usize
+    {
+	self.0
+    }
+    #[inline] 
+    pub fn condensed_hash(&self) -> &Output<D>
+    {
+	&self.1
+    }
+    pub fn into_bytes(self) -> bytes::Bytes
+    {
+	let mut bytes = bytes::BytesMut::with_capacity(self.1.len() + std::mem::size_of::<u64>());
+	use bytes::BufMut;
+	bytes.put_u64(self.0.try_into().unwrap());
+	bytes.extend(self.1.into_iter());
+	bytes.freeze()
+    }
+    pub fn from_bytes(mut bytes: impl bytes::Buf) -> Self
+    {
+	let mut output = Output::<D>::default();
+	Self(bytes.get_u64().try_into().unwrap(), {
+	    bytes.copy_to_slice(&mut output[..]);
+	    output
+	})
+    }
+}
+
+impl<D: Digest> From<ParallelHashOutput<D>> for bytes::Bytes
+{
+    #[inline] 
+    fn from(from: ParallelHashOutput<D>) -> Self
+    {
+	from.into_bytes()
+    }
+}
 
-pub struct ParallelHash<D: Digest>(Vec<Output<D>>);
+
+impl<D: Digest> From<ParallelHash<D>> for ParallelHashOutput<D>
+{
+    #[inline] 
+    fn from(from: ParallelHash<D>) -> Self
+    {
+	from.finalize()
+    }
+}
+
+impl<D: Digest> ParallelHash<D>
+{
+    pub fn finalize(self) -> ParallelHashOutput<D>
+    {
+	let mut digest = D::new();
+	for buf in self.0.into_iter() {
+	    digest.update(buf);
+	}
+	ParallelHashOutput(self.1, digest.finalize())
+    }
+    
+    #[inline(always)] 
+    fn digest_single_chunk(slice: impl AsRef<[u8]>) -> Output<D>
+    {
+	D::digest(slice)
+    }
+    
+    /// # Safety
+    /// `last` must either be:
+    /// * the last slice written to `self`
+    /// * a full chunk
+    #[inline] 
+    unsafe fn append_slice_unchecked(&mut self, last: impl AsRef<[u8]>)
+    {
+	self.0.push(Self::digest_single_chunk(last));
+    }
+
+    #[inline] 
+    pub(crate) fn append_chunks(&mut self, chunks: impl rayon::iter::IndexedParallelIterator<Item=Output<D>>) -> usize
+    {
+	let mut temp = Vec::new();
+	chunks.collect_into_vec(&mut temp);
+	self.0.extend_from_slice(&temp[..]);
+	temp.len()
+    }
+    
+    fn append_chunks_unzipped<E: Send>(&mut self, chunks: impl rayon::iter::IndexedParallelIterator<Item= (Option<Output<D>>, Option<E>)>) -> (usize, impl std::iter::Iterator<Item=E>)
+    {
+	let (mut ok, mut err) = (Vec::new(), Vec::new());
+	chunks.unzip_into_vecs(&mut ok, &mut err);
+	let l = self.0.len();
+	self.0.extend(ok.into_iter().filter_map(std::convert::identity));
+	(self.0.len() - l, err.into_iter().filter_map(std::convert::identity))
+    }
+}
+
+
+impl<D: Digest> fmt::Display for ParallelHashOutput<D>
+{
+    #[inline] 
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
+    {
+	use crate::encode::*;
+	write!(f, "{}:", self.0)?;
+	HexEncoder::encode_slice(&HexEncoder, &self.1, f)
+    }
+}
 
 impl<D: Digest> fmt::Display for ParallelHash<D>
 {
@@ -21,7 +153,7 @@ impl<D: Digest> fmt::Display for ParallelHash<D>
     {
 	use crate::encode::*;
 	let mut d = D::new();
-	write!(f, "{}:", self.0.len())?;
+	write!(f, "{}:", self.1)?;
 
 	for output in self.0.iter() {
 	    d.update(&output[..]);
@@ -34,21 +166,107 @@ impl<D: Digest> fmt::Display for ParallelHash<D>
 impl<D: Digest + Send + Sync> ParallelDigest<D>
 {
     /// Create a new digest
-    pub const fn new(chunk: usize) -> Self
+    pub fn new(chunk_size: usize) -> Self
     {
-	Self(chunk, PhantomData)
+	Self{
+	    chunk_size,
+	    completed: ParallelHash(Vec::new(), chunk_size),
+	    last_slice: Vec::with_capacity(chunk_size),
+	}
+    }
+
+    fn append_slice_raw<'s>(&mut self, slice: &'s [u8]) -> Option<&'s [u8]>
+    {
+	use rayon::prelude::*;
+	let (_, mut rest) = self
+	    .completed
+	    .append_chunks_unzipped(slice
+				    .par_chunks(self.chunk_size)
+				    .map(|slice| if slice.len() == self.chunk_size {
+					(Some(ParallelHash::<D>::digest_single_chunk(slice)), None)
+				    } else {
+					(None, Some(slice))
+				    }));
+	rest.next() // We know there will only be one of these
+    }
+
+    fn fill_and_take_buf(&mut self, slice: &mut &[u8]) -> Option<bytes::Bytes>
+    {
+	if !self.last_slice.is_empty() {
+	    let rest = self.chunk_size - self.last_slice.len();
+	    let rest = std::cmp::min(slice.len(), rest);
+	    self.last_slice.extend_from_slice(&slice[..rest]); //XXX: This is probably quite slow...
+	    if slice.len() != rest {
+		*slice = &slice[rest..];
+	    } else {
+		*slice = &[];
+	    }
+
+	    if self.last_slice.len() == self.chunk_size {
+		let output = (&mut &self.last_slice[..]).copy_to_bytes(self.chunk_size);
+		self.last_slice.clear();
+		Some(output)
+	    } else {
+		None
+	    }
+	} else {
+	    None
+	}
+    }
+    
+    pub fn append_buf(&mut self, buf: &mut (impl Buf + ?Sized))
+    {
+	while buf.has_remaining() {
+	    let cs = {
+		let chunk = buf.chunk();
+		self.append_slice(chunk);
+		chunk.len()
+	    };
+	    buf.advance(cs);
+	}
+    }
+    
+    pub fn append_slice(&mut self, slice: impl AsRef<[u8]>)
+    {
+	let mut slice = slice.as_ref();
+	if let Some(chunk0) = self.fill_and_take_buf(&mut slice) {
+	    debug_assert_eq!(chunk0.len(), self.chunk_size, "internal buffer release not chunk_size long");
+	    // SAFETY: we know `chunk0` is a full chunk.
+	    unsafe {
+		self.completed.append_slice_unchecked(chunk0)
+	    }
+	}
+	if slice.len() > 0 {
+	    if let Some(rest) = self.append_slice_raw(slice) {
+		self.last_slice.extend_from_slice(rest);
+	    }
+	}
+    }
+
+    pub fn complete(self) -> ParallelHash<D>
+    {
+	if self.last_slice.is_empty() {
+	    self.completed
+	} else {
+	    let mut output = self.completed;
+	    // SAFETY: This is the final slice written to `output`.
+	    unsafe {
+		output.append_slice_unchecked(self.last_slice);
+	    }
+	    output
+	}
     }
     
-    /// Compute a parallel digest from `data`.
+    /// Compute a parallel digest from `data` only.
     #[inline]
-    pub fn digest(&self, data: impl AsRef<[u8]>) -> ParallelHash<D>
+    pub fn digest_slice(chunk_size: usize, data: impl AsRef<[u8]>) -> ParallelHash<D>
     {
-	ParallelHash(phash_digest_into::<D>(data.as_ref(), self.0))
+	ParallelHash(phash_digest_into::<D>(data.as_ref(), chunk_size), chunk_size)
     }
 }
 
 #[inline(always)]
-fn phash_raw<'a, T: Send, F: 'a>(data: &'a [u8], chunk: usize, digest: F) -> impl rayon::iter::IndexedParallelIterator<Item = T> + 'a
+pub(crate) fn phash_raw<'a, T: Send, F: 'a>(data: &'a [u8], chunk: usize, digest: F) -> impl rayon::iter::IndexedParallelIterator<Item = T> + 'a
 where F: Fn(&[u8]) -> T + Send + Sync
 {
     use rayon::prelude::*;
@@ -57,7 +275,7 @@ where F: Fn(&[u8]) -> T + Send + Sync
 }
 
 #[inline(always)]
-fn into_output<'a, T,F, U>(data: &'a [u8], chunk: usize, func: F) -> Vec<T>
+pub(crate) fn into_output<'a, T,F, U>(data: &'a [u8], chunk: usize, func: F) -> Vec<T>
 where F: FnOnce(&'a [u8], usize) -> U,
       U: rayon::iter::IndexedParallelIterator<Item = T> + 'a
 {
@@ -118,3 +336,15 @@ fn phash<D: Digest + Send + Sync>(data: impl AsRef<[u8]>, chunk: usize) -> Paral
 {
 
 }*/
+
+#[cfg(test)]
+mod tests
+{
+    use super::*;
+    #[test]
+    fn paralell_hashing()
+    {
+	let mut zeros = [0u8; 512];
+	//ParallelDigest::new(10).digest(data)
+    }
+}

src/lib.rs

@@ -1,4 +1,117 @@
 
-//mod pool; A)JR AOISJOAIJOIA JODIJAOSI JDFUCK THIS DOESN@T WORK FUCK ATOMICREFCELL FUCK YOU FFUCK EVERYTHING AAAAAAAAAAAAA
+//mod ext; use ext::*; 
-pub mod encode;
+mod encode;
-pub mod hash;
+mod hash;
+
+pub use digest;
+
+pub use hash::{
+    ParallelHashOutput,
+    ParallelHash,
+    ParallelDigest,
+};
+
+pub type DefaultDigest = sha2::Sha256;
+
+#[derive(Debug, Clone, PartialEq, Eq, Default)]
+pub struct Builder<D= DefaultDigest>
+{
+    digest: std::marker::PhantomData<D>,
+    chunk_size: Option<std::num::NonZeroUsize>,
+}
+
+impl Builder<DefaultDigest>
+{
+    #[inline] 
+    pub fn create_default() -> ParallelDigest<DefaultDigest>
+    {
+	Self::new().create()
+    }
+    pub const fn new_default() -> Self
+    {
+	Self {
+	    digest: std::marker::PhantomData,
+	    chunk_size: None
+	}
+    }
+}
+
+impl<D: digest::Digest> Builder<D>
+{
+    //pub type Digest = D;
+    pub const fn new() -> Self
+    {
+	Self {
+	    digest: std::marker::PhantomData,
+	    chunk_size: None
+	}
+    }
+    pub const fn with_digest<N: digest::Digest>(self) -> Builder<N>
+    {
+	Builder {
+	    chunk_size: self.chunk_size,
+	    digest: std::marker::PhantomData,
+	}
+    }
+    pub const fn with_chunk_size(self, chunk_size: usize) -> Self
+    {
+	Self {
+	    chunk_size: std::num::NonZeroUsize::new(chunk_size),
+	    ..self
+	}
+    }
+}
+impl<D: digest::Digest + Send + Sync> Builder<D>
+{
+    #[inline] 
+    pub fn chunk_size(&self) -> usize
+    {
+	extern "C" {
+	    fn getpagesize() -> std::os::raw::c_int;
+	}
+	self.chunk_size
+	    .or_else(|| unsafe { std::num::NonZeroUsize::new(getpagesize().try_into().expect("Failed to get page size")) })
+	    .expect("Failed to get page size: cannot be zero")
+	    .get()
+    }
+    #[inline] 
+    pub fn create(self) -> ParallelDigest<D>
+    {
+	ParallelDigest::<D>::new(self.chunk_size())
+    }
+    #[inline] 
+    pub fn digest_slice(self, slice: impl AsRef<[u8]>) -> ParallelHash<D>
+    {
+	ParallelDigest::<D>::digest_slice(self.chunk_size(), slice)
+    }
+}
+
+impl<D: digest::Digest + Send + Sync> From<Builder<D>> for ParallelDigest<D>
+{
+    #[inline] 
+    fn from(from: Builder<D>) -> Self
+    {
+	from.create()
+    }
+}
+
+#[cfg(test)]
+mod tests
+{
+    use super::*;
+    #[test]
+    fn parallel_hash_specific_cs()
+    {
+	const CHUNK_SIZE: usize = 0;
+	let slice = [10u8; 4096 << 2];//b"One two three for fize size seven eight.";
+	let mut digest = Builder::new().with_chunk_size(CHUNK_SIZE).create();
+	digest.append_slice(slice);
+	let digest=  digest.complete().finalize();
+	println!("digest: {digest}");
+	
+	assert_eq!(digest, Builder::new_default().with_chunk_size(CHUNK_SIZE).digest_slice(slice).finalize(), "phash of same input produced different output");
+	
+	assert_ne!(digest, Builder::new_default().with_chunk_size(CHUNK_SIZE).digest_slice(&slice[..8]).finalize(), "phash of differing input produced same output");
+    }
+}
+