rename + readme

1 files changed, 0 insertions, 190 deletions

diff --git a/lvc/codec/src/huff.rs b/lvc/codec/src/huff.rs
deleted file mode 100644
index 6d74c42..0000000
--- a/lvc/codec/src/huff.rs
+++ /dev/null
@@ -1,190 +0,0 @@
-use std::io::{Read, Result, Write};
-
-#[derive(Debug, Clone)]
-enum HT {
-    Branch(Box<HT>, Box<HT>),
-    Terminal(u8),
-}
-
-pub fn write_huff(buf: &[u8], w: &mut impl Write) -> Result<usize> {
-    let mut w = BitIO::new(w);
-    assert!(buf.len() <= 0xffffff, "huff frame too big");
-    w.wbyte((buf.len() & 0xff) as u8)?;
-    w.wbyte(((buf.len() >> 8) & 0xff) as u8)?;
-    w.wbyte(((buf.len() >> 16) & 0xff) as u8)?;
-
-    let mut probs = [0usize; 256];
-    for b in buf {
-        probs[*b as usize] += 1;
-    }
-    let tree = HT::from_probabilities(probs);
-    let mut table = [0u32; 256];
-    tree.create_lut(&mut table, 1);
-    tree.write(&mut w)?;
-
-
-    for b in buf {
-        let mut k = table[*b as usize];
-        while k != 1 {
-            w.wbit((k & 1) == 1)?;
-            k >>= 1;
-        }
-    }
-    
-    w.flush()?;
-    Ok(w.position)
-}
-
-pub fn read_huff(r: &mut impl Read, buf: &mut Vec<u8>) -> Result<usize> {
-    let mut r = BitIO::new(r);
-
-    let mut len = 0usize;
-    len |= r.rbyte()? as usize;
-    len |= (r.rbyte()? as usize) << 8;
-    len |= (r.rbyte()? as usize) << 16;
-
-    let root = HT::read(&mut r)?;
-    let root = match &root {
-        HT::Branch(a, b) => [a, b],
-        _ => panic!("no!"),
-    };
-
-    let mut cursor = root;
-    while buf.len() != len {
-        let v = r.rbit()?;
-        match cursor[v as usize].as_ref() {
-            HT::Branch(a, b) => {
-                cursor = [a, b];
-            }
-            HT::Terminal(n) => {
-                buf.push(*n);
-                cursor = root;
-            }
-        }
-    }
-    Ok(r.position)
-}
-
-impl HT {
-    pub fn from_probabilities(ps: [usize; 256]) -> Self {
-        let mut parts = ps
-            .into_iter()
-            .enumerate()
-            .map(|(n, p)| (p, HT::Terminal(n as u8)))
-            .collect::<Vec<_>>();
-
-        while parts.len() != 1 {
-            parts.sort_by_key(|e| -(e.0 as isize));
-            let ((ap, at), (bp, bt)) = (parts.pop().unwrap(), parts.pop().unwrap());
-            parts.push((ap + bp + 1, HT::Branch(box at, box bt)))
-        }
-        parts[0].1.clone()
-    }
-    pub fn create_lut(&self, table: &mut [u32; 256], mut prefix: u32) {
-        assert!(self.depth() < 30, "too deep! doesnt fit {}", self.depth());
-        match self {
-            HT::Branch(a, b) => {
-                let pz = 32 - prefix.leading_zeros();
-                prefix ^= 1 << pz;
-                prefix ^= 1 << (pz - 1);
-                a.create_lut(table, prefix);
-                prefix ^= 1 << (pz - 1);
-                b.create_lut(table, prefix);
-            }
-            HT::Terminal(n) => {
-                assert_eq!(table[*n as usize], 0);
-                table[*n as usize] = prefix
-            }
-        }
-    }
-    pub fn depth(&self) -> usize {
-        match self {
-            HT::Branch(a, b) => a.depth().max(b.depth()) + 1,
-            HT::Terminal(_) => 0,
-        }
-    }
-    pub fn write(&self, w: &mut BitIO<impl Write>) -> Result<()> {
-        match self {
-            HT::Branch(a, b) => {
-                w.wbit(false)?;
-                a.write(w)?;
-                b.write(w)?;
-            }
-            HT::Terminal(n) => {
-                w.wbit(true)?;
-                w.wbyte(*n)?;
-            }
-        }
-        Ok(())
-    }
-    pub fn read(r: &mut BitIO<impl Read>) -> Result<Self> {
-        match r.rbit()? {
-            false => Ok(Self::Branch(box Self::read(r)?, box Self::read(r)?)),
-            true => Ok(Self::Terminal(r.rbyte()?)),
-        }
-    }
-}
-
-pub struct BitIO<T> {
-    inner: T,
-    byte: u8,
-    position: usize,
-}
-impl<T> BitIO<T> {
-    pub fn new(inner: T) -> Self {
-        Self {
-            inner,
-            byte: 0,
-            position: 0,
-        }
-    }
-}
-impl<T: Write> BitIO<T> {
-    #[inline]
-    pub fn wbit(&mut self, b: bool) -> Result<()> {
-        self.byte <<= 1;
-        self.byte |= b as u8;
-        self.position += 1;
-        if self.position & 0b111 == 0 {
-            self.inner.write_all(&[self.byte])?;
-        }
-        Ok(())
-    }
-    #[inline]
-    pub fn wbyte(&mut self, v: u8) -> Result<()> {
-        for i in 0..8 {
-            self.wbit((v & (1 << i)) != 0)?;
-        }
-        Ok(())
-    }
-    pub fn flush(&mut self) -> Result<()> {
-        while self.position & 0b111 != 0 {
-            self.wbit(false)?;
-        }
-        Ok(())
-    }
-}
-
-impl<T: Read> BitIO<T> {
-    #[inline]
-    pub fn rbit(&mut self) -> Result<bool> {
-        if self.position & 0b111 == 0 {
-            let mut buf = [0];
-            self.inner.read_exact(&mut buf)?;
-            self.byte = buf[0];
-        }
-
-        let v = (self.byte & 0b10000000) != 0;
-        self.byte <<= 1;
-        self.position += 1;
-        Ok(v)
-    }
-    #[inline]
-    pub fn rbyte(&mut self) -> Result<u8> {
-        let mut v = 0u8;
-        for i in 0..8 {
-            v |= (self.rbit()? as u8) << i;
-        }
-        Ok(v)
-    }
-}