Add huffman encoding
This commit is contained in:
Carl Lerche
519
util/genhuff/src/main.rs
Normal file
519
util/genhuff/src/main.rs
Normal file
@@ -0,0 +1,519 @@
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use std::cell::RefCell;
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struct Node {
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id: Option<usize>,
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left: Option<Box<Node>>,
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right: Option<Box<Node>>,
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terminal: Option<usize>,
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maybe_eos: bool,
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transitions: RefCell<Vec<Transition>>,
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}
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#[derive(Debug, Default, Copy, Clone)]
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struct Transition {
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target: Option<usize>,
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byte: Option<usize>,
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maybe_eos: bool,
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}
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impl Node {
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fn new(byte: usize, code: &[bool]) -> Box<Node> {
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let mut node = Box::new(Node {
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id: None,
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left: None,
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right: None,
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terminal: None,
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maybe_eos: false,
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transitions: Default::default(),
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});
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node.insert(byte, code);
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node
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}
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fn insert(&mut self, byte: usize, code: &[bool]) {
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if code.is_empty() {
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self.terminal = Some(byte);
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return;
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}
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let (head, rest) = code.split_at(1);
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if !head[0] {
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match self.left {
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Some(ref mut node) => {
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node.insert(byte, rest);
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}
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None => {
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self.left = Some(Node::new(byte, rest));
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}
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}
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} else {
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match self.right {
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Some(ref mut node) => {
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node.insert(byte, rest);
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}
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None => {
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self.right = Some(Node::new(byte, rest));
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}
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}
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}
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}
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fn set_id(&mut self, next_id: &mut usize, prefix: &mut Vec<bool>) {
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if self.terminal.is_some() {
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return;
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}
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if prefix.len() <= 7 && prefix.iter().all(|i| *i) {
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self.maybe_eos = true;
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}
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let id = *next_id;
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*next_id = id + 1;
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self.id = Some(id);
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if let Some(ref mut node) = self.left {
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prefix.push(false);
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node.set_id(next_id, prefix);
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prefix.pop();
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}
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if let Some(ref mut node) = self.right {
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prefix.push(true);
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node.set_id(next_id, prefix);
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prefix.pop();
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}
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}
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fn compute_transitions(&self, root: &Node) {
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self.compute_transition(None, self, root, 4);
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if let Some(ref node) = self.left {
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node.compute_transitions(root);
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}
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if let Some(ref node) = self.right {
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node.compute_transitions(root);
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}
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}
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fn compute_transition(&self,
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byte: Option<usize>,
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start: &Node,
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root: &Node,
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steps_remaining: usize)
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{
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if steps_remaining == 0 {
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let (byte, target) = match byte {
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Some(256) => (None, None),
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_ => {
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(byte, Some(self.id.unwrap_or(0)))
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}
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};
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start.transitions.borrow_mut().push(Transition {
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target: target,
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byte: byte,
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maybe_eos: self.maybe_eos,
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});
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return;
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}
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let mut next = self;
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if self.terminal.is_some() {
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next = root;
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}
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assert!(next.left.is_some());
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assert!(next.right.is_some());
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for node in &[next.left.as_ref().unwrap(), next.right.as_ref().unwrap()] {
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let byte = match node.terminal {
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Some(b) => {
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assert!(byte.is_none());
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Some(b)
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}
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None => byte,
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};
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node.compute_transition(byte, start, root, steps_remaining - 1);
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}
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}
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fn print(&self) {
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const MAYBE_EOS: u8 = 1;
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const DECODED: u8 = 2;
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const ERROR: u8 = 4;
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if self.terminal.is_some() {
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return;
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}
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println!(" // {}", self.id.unwrap());
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println!(" [");
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for transition in self.transitions.borrow().iter() {
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let mut flags = 0;
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let mut out = 0;
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let target = match transition.target {
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Some(target) => target,
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None => {
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flags |= ERROR;
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0
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}
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};
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if let Some(byte) = transition.byte {
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out = byte;
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flags |= DECODED;
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// TODO: Add other flags
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}
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if transition.maybe_eos {
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flags |= MAYBE_EOS;
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}
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println!(" ({}, {}, 0x{:02x}),", target, out, flags);
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}
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println!(" ],");
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self.left.as_ref().unwrap().print();
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self.right.as_ref().unwrap().print();
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}
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}
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/// Returns root of tree
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fn load_table() -> (Vec<(usize, String)>, Box<Node>) {
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let mut lines = TABLE.lines();
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let mut root: Option<Box<Node>> = None;
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let mut encode = vec![];
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// Skip the first line, which is empty
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lines.next();
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for (i, line) in lines.enumerate() {
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let mut bits: Vec<bool> = vec![];
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for &b in &line.as_bytes()[12..45] {
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match b {
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b'1' => bits.push(true),
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b'0' => bits.push(false),
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b'|' | b' ' => {}
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_ => panic!("unexpected byte; {:?}", b),
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}
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}
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let hex = line[50..59].trim();
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encode.push((bits.len(), hex.to_string()));
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match root {
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Some(ref mut node) => {
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node.insert(i, &bits);
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}
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None => {
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root = Some(Node::new(i, &bits));
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}
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}
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}
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// Assign IDs to all state transition nodes
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let mut root = root.unwrap();
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let mut id = 0;
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root.set_id(&mut id, &mut vec![]);
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// Compute transitions for each node
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root.compute_transitions(&root);
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(encode, root)
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}
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pub fn main() {
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let (encode, decode) = load_table();
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println!("// !!! DO NOT EDIT !!! Generated by util/genhuff/src/main.rs");
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println!("");
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println!("// (num-bits, bits)");
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println!("pub const ENCODE_TABLE: [(usize, u64); 257] = [");
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for (nbits, val) in encode {
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println!(" ({}, 0x{}),", nbits, val);
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}
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println!("];");
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println!("");
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println!("// (next-state, byte, flags)");
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println!("pub const DECODE_TABLE: [[(usize, u8, u8); 16]; 256] = [");
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decode.print();
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println!("];");
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}
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const TABLE: &'static str = r##"
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( 0) |11111111|11000 1ff8 [13]
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( 1) |11111111|11111111|1011000 7fffd8 [23]
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( 2) |11111111|11111111|11111110|0010 fffffe2 [28]
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( 3) |11111111|11111111|11111110|0011 fffffe3 [28]
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( 4) |11111111|11111111|11111110|0100 fffffe4 [28]
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( 5) |11111111|11111111|11111110|0101 fffffe5 [28]
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( 6) |11111111|11111111|11111110|0110 fffffe6 [28]
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( 7) |11111111|11111111|11111110|0111 fffffe7 [28]
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( 8) |11111111|11111111|11111110|1000 fffffe8 [28]
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( 9) |11111111|11111111|11101010 ffffea [24]
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( 10) |11111111|11111111|11111111|111100 3ffffffc [30]
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( 11) |11111111|11111111|11111110|1001 fffffe9 [28]
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( 12) |11111111|11111111|11111110|1010 fffffea [28]
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( 13) |11111111|11111111|11111111|111101 3ffffffd [30]
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( 14) |11111111|11111111|11111110|1011 fffffeb [28]
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( 15) |11111111|11111111|11111110|1100 fffffec [28]
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( 16) |11111111|11111111|11111110|1101 fffffed [28]
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( 17) |11111111|11111111|11111110|1110 fffffee [28]
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( 18) |11111111|11111111|11111110|1111 fffffef [28]
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( 19) |11111111|11111111|11111111|0000 ffffff0 [28]
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( 20) |11111111|11111111|11111111|0001 ffffff1 [28]
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( 21) |11111111|11111111|11111111|0010 ffffff2 [28]
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( 22) |11111111|11111111|11111111|111110 3ffffffe [30]
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( 23) |11111111|11111111|11111111|0011 ffffff3 [28]
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( 24) |11111111|11111111|11111111|0100 ffffff4 [28]
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( 25) |11111111|11111111|11111111|0101 ffffff5 [28]
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( 26) |11111111|11111111|11111111|0110 ffffff6 [28]
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( 27) |11111111|11111111|11111111|0111 ffffff7 [28]
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( 28) |11111111|11111111|11111111|1000 ffffff8 [28]
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( 29) |11111111|11111111|11111111|1001 ffffff9 [28]
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( 30) |11111111|11111111|11111111|1010 ffffffa [28]
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( 31) |11111111|11111111|11111111|1011 ffffffb [28]
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' ' ( 32) |010100 14 [ 6]
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'!' ( 33) |11111110|00 3f8 [10]
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'"' ( 34) |11111110|01 3f9 [10]
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'#' ( 35) |11111111|1010 ffa [12]
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'$' ( 36) |11111111|11001 1ff9 [13]
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'%' ( 37) |010101 15 [ 6]
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'&' ( 38) |11111000 f8 [ 8]
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''' ( 39) |11111111|010 7fa [11]
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'(' ( 40) |11111110|10 3fa [10]
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')' ( 41) |11111110|11 3fb [10]
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'*' ( 42) |11111001 f9 [ 8]
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'+' ( 43) |11111111|011 7fb [11]
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',' ( 44) |11111010 fa [ 8]
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'-' ( 45) |010110 16 [ 6]
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'.' ( 46) |010111 17 [ 6]
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'/' ( 47) |011000 18 [ 6]
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'0' ( 48) |00000 0 [ 5]
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'1' ( 49) |00001 1 [ 5]
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'2' ( 50) |00010 2 [ 5]
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'3' ( 51) |011001 19 [ 6]
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'4' ( 52) |011010 1a [ 6]
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'5' ( 53) |011011 1b [ 6]
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'6' ( 54) |011100 1c [ 6]
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'7' ( 55) |011101 1d [ 6]
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'8' ( 56) |011110 1e [ 6]
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'9' ( 57) |011111 1f [ 6]
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':' ( 58) |1011100 5c [ 7]
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';' ( 59) |11111011 fb [ 8]
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'<' ( 60) |11111111|1111100 7ffc [15]
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'=' ( 61) |100000 20 [ 6]
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'>' ( 62) |11111111|1011 ffb [12]
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'?' ( 63) |11111111|00 3fc [10]
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'@' ( 64) |11111111|11010 1ffa [13]
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'A' ( 65) |100001 21 [ 6]
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'B' ( 66) |1011101 5d [ 7]
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'C' ( 67) |1011110 5e [ 7]
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'D' ( 68) |1011111 5f [ 7]
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'E' ( 69) |1100000 60 [ 7]
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'F' ( 70) |1100001 61 [ 7]
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'G' ( 71) |1100010 62 [ 7]
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'H' ( 72) |1100011 63 [ 7]
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'I' ( 73) |1100100 64 [ 7]
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'J' ( 74) |1100101 65 [ 7]
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'K' ( 75) |1100110 66 [ 7]
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'L' ( 76) |1100111 67 [ 7]
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'M' ( 77) |1101000 68 [ 7]
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'N' ( 78) |1101001 69 [ 7]
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'O' ( 79) |1101010 6a [ 7]
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'P' ( 80) |1101011 6b [ 7]
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'Q' ( 81) |1101100 6c [ 7]
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'R' ( 82) |1101101 6d [ 7]
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'S' ( 83) |1101110 6e [ 7]
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'T' ( 84) |1101111 6f [ 7]
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'U' ( 85) |1110000 70 [ 7]
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'V' ( 86) |1110001 71 [ 7]
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'W' ( 87) |1110010 72 [ 7]
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'X' ( 88) |11111100 fc [ 8]
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'Y' ( 89) |1110011 73 [ 7]
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'Z' ( 90) |11111101 fd [ 8]
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'[' ( 91) |11111111|11011 1ffb [13]
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'\' ( 92) |11111111|11111110|000 7fff0 [19]
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']' ( 93) |11111111|11100 1ffc [13]
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'^' ( 94) |11111111|111100 3ffc [14]
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'_' ( 95) |100010 22 [ 6]
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'`' ( 96) |11111111|1111101 7ffd [15]
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'a' ( 97) |00011 3 [ 5]
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'b' ( 98) |100011 23 [ 6]
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'c' ( 99) |00100 4 [ 5]
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'd' (100) |100100 24 [ 6]
|
||||
'e' (101) |00101 5 [ 5]
|
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'f' (102) |100101 25 [ 6]
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||||
'g' (103) |100110 26 [ 6]
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'h' (104) |100111 27 [ 6]
|
||||
'i' (105) |00110 6 [ 5]
|
||||
'j' (106) |1110100 74 [ 7]
|
||||
'k' (107) |1110101 75 [ 7]
|
||||
'l' (108) |101000 28 [ 6]
|
||||
'm' (109) |101001 29 [ 6]
|
||||
'n' (110) |101010 2a [ 6]
|
||||
'o' (111) |00111 7 [ 5]
|
||||
'p' (112) |101011 2b [ 6]
|
||||
'q' (113) |1110110 76 [ 7]
|
||||
'r' (114) |101100 2c [ 6]
|
||||
's' (115) |01000 8 [ 5]
|
||||
't' (116) |01001 9 [ 5]
|
||||
'u' (117) |101101 2d [ 6]
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||||
'v' (118) |1110111 77 [ 7]
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||||
'w' (119) |1111000 78 [ 7]
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||||
'x' (120) |1111001 79 [ 7]
|
||||
'y' (121) |1111010 7a [ 7]
|
||||
'z' (122) |1111011 7b [ 7]
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'{' (123) |11111111|1111110 7ffe [15]
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'|' (124) |11111111|100 7fc [11]
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'}' (125) |11111111|111101 3ffd [14]
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'~' (126) |11111111|11101 1ffd [13]
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(127) |11111111|11111111|11111111|1100 ffffffc [28]
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(128) |11111111|11111110|0110 fffe6 [20]
|
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(129) |11111111|11111111|010010 3fffd2 [22]
|
||||
(130) |11111111|11111110|0111 fffe7 [20]
|
||||
(131) |11111111|11111110|1000 fffe8 [20]
|
||||
(132) |11111111|11111111|010011 3fffd3 [22]
|
||||
(133) |11111111|11111111|010100 3fffd4 [22]
|
||||
(134) |11111111|11111111|010101 3fffd5 [22]
|
||||
(135) |11111111|11111111|1011001 7fffd9 [23]
|
||||
(136) |11111111|11111111|010110 3fffd6 [22]
|
||||
(137) |11111111|11111111|1011010 7fffda [23]
|
||||
(138) |11111111|11111111|1011011 7fffdb [23]
|
||||
(139) |11111111|11111111|1011100 7fffdc [23]
|
||||
(140) |11111111|11111111|1011101 7fffdd [23]
|
||||
(141) |11111111|11111111|1011110 7fffde [23]
|
||||
(142) |11111111|11111111|11101011 ffffeb [24]
|
||||
(143) |11111111|11111111|1011111 7fffdf [23]
|
||||
(144) |11111111|11111111|11101100 ffffec [24]
|
||||
(145) |11111111|11111111|11101101 ffffed [24]
|
||||
(146) |11111111|11111111|010111 3fffd7 [22]
|
||||
(147) |11111111|11111111|1100000 7fffe0 [23]
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||||
(148) |11111111|11111111|11101110 ffffee [24]
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||||
(149) |11111111|11111111|1100001 7fffe1 [23]
|
||||
(150) |11111111|11111111|1100010 7fffe2 [23]
|
||||
(151) |11111111|11111111|1100011 7fffe3 [23]
|
||||
(152) |11111111|11111111|1100100 7fffe4 [23]
|
||||
(153) |11111111|11111110|11100 1fffdc [21]
|
||||
(154) |11111111|11111111|011000 3fffd8 [22]
|
||||
(155) |11111111|11111111|1100101 7fffe5 [23]
|
||||
(156) |11111111|11111111|011001 3fffd9 [22]
|
||||
(157) |11111111|11111111|1100110 7fffe6 [23]
|
||||
(158) |11111111|11111111|1100111 7fffe7 [23]
|
||||
(159) |11111111|11111111|11101111 ffffef [24]
|
||||
(160) |11111111|11111111|011010 3fffda [22]
|
||||
(161) |11111111|11111110|11101 1fffdd [21]
|
||||
(162) |11111111|11111110|1001 fffe9 [20]
|
||||
(163) |11111111|11111111|011011 3fffdb [22]
|
||||
(164) |11111111|11111111|011100 3fffdc [22]
|
||||
(165) |11111111|11111111|1101000 7fffe8 [23]
|
||||
(166) |11111111|11111111|1101001 7fffe9 [23]
|
||||
(167) |11111111|11111110|11110 1fffde [21]
|
||||
(168) |11111111|11111111|1101010 7fffea [23]
|
||||
(169) |11111111|11111111|011101 3fffdd [22]
|
||||
(170) |11111111|11111111|011110 3fffde [22]
|
||||
(171) |11111111|11111111|11110000 fffff0 [24]
|
||||
(172) |11111111|11111110|11111 1fffdf [21]
|
||||
(173) |11111111|11111111|011111 3fffdf [22]
|
||||
(174) |11111111|11111111|1101011 7fffeb [23]
|
||||
(175) |11111111|11111111|1101100 7fffec [23]
|
||||
(176) |11111111|11111111|00000 1fffe0 [21]
|
||||
(177) |11111111|11111111|00001 1fffe1 [21]
|
||||
(178) |11111111|11111111|100000 3fffe0 [22]
|
||||
(179) |11111111|11111111|00010 1fffe2 [21]
|
||||
(180) |11111111|11111111|1101101 7fffed [23]
|
||||
(181) |11111111|11111111|100001 3fffe1 [22]
|
||||
(182) |11111111|11111111|1101110 7fffee [23]
|
||||
(183) |11111111|11111111|1101111 7fffef [23]
|
||||
(184) |11111111|11111110|1010 fffea [20]
|
||||
(185) |11111111|11111111|100010 3fffe2 [22]
|
||||
(186) |11111111|11111111|100011 3fffe3 [22]
|
||||
(187) |11111111|11111111|100100 3fffe4 [22]
|
||||
(188) |11111111|11111111|1110000 7ffff0 [23]
|
||||
(189) |11111111|11111111|100101 3fffe5 [22]
|
||||
(190) |11111111|11111111|100110 3fffe6 [22]
|
||||
(191) |11111111|11111111|1110001 7ffff1 [23]
|
||||
(192) |11111111|11111111|11111000|00 3ffffe0 [26]
|
||||
(193) |11111111|11111111|11111000|01 3ffffe1 [26]
|
||||
(194) |11111111|11111110|1011 fffeb [20]
|
||||
(195) |11111111|11111110|001 7fff1 [19]
|
||||
(196) |11111111|11111111|100111 3fffe7 [22]
|
||||
(197) |11111111|11111111|1110010 7ffff2 [23]
|
||||
(198) |11111111|11111111|101000 3fffe8 [22]
|
||||
(199) |11111111|11111111|11110110|0 1ffffec [25]
|
||||
(200) |11111111|11111111|11111000|10 3ffffe2 [26]
|
||||
(201) |11111111|11111111|11111000|11 3ffffe3 [26]
|
||||
(202) |11111111|11111111|11111001|00 3ffffe4 [26]
|
||||
(203) |11111111|11111111|11111011|110 7ffffde [27]
|
||||
(204) |11111111|11111111|11111011|111 7ffffdf [27]
|
||||
(205) |11111111|11111111|11111001|01 3ffffe5 [26]
|
||||
(206) |11111111|11111111|11110001 fffff1 [24]
|
||||
(207) |11111111|11111111|11110110|1 1ffffed [25]
|
||||
(208) |11111111|11111110|010 7fff2 [19]
|
||||
(209) |11111111|11111111|00011 1fffe3 [21]
|
||||
(210) |11111111|11111111|11111001|10 3ffffe6 [26]
|
||||
(211) |11111111|11111111|11111100|000 7ffffe0 [27]
|
||||
(212) |11111111|11111111|11111100|001 7ffffe1 [27]
|
||||
(213) |11111111|11111111|11111001|11 3ffffe7 [26]
|
||||
(214) |11111111|11111111|11111100|010 7ffffe2 [27]
|
||||
(215) |11111111|11111111|11110010 fffff2 [24]
|
||||
(216) |11111111|11111111|00100 1fffe4 [21]
|
||||
(217) |11111111|11111111|00101 1fffe5 [21]
|
||||
(218) |11111111|11111111|11111010|00 3ffffe8 [26]
|
||||
(219) |11111111|11111111|11111010|01 3ffffe9 [26]
|
||||
(220) |11111111|11111111|11111111|1101 ffffffd [28]
|
||||
(221) |11111111|11111111|11111100|011 7ffffe3 [27]
|
||||
(222) |11111111|11111111|11111100|100 7ffffe4 [27]
|
||||
(223) |11111111|11111111|11111100|101 7ffffe5 [27]
|
||||
(224) |11111111|11111110|1100 fffec [20]
|
||||
(225) |11111111|11111111|11110011 fffff3 [24]
|
||||
(226) |11111111|11111110|1101 fffed [20]
|
||||
(227) |11111111|11111111|00110 1fffe6 [21]
|
||||
(228) |11111111|11111111|101001 3fffe9 [22]
|
||||
(229) |11111111|11111111|00111 1fffe7 [21]
|
||||
(230) |11111111|11111111|01000 1fffe8 [21]
|
||||
(231) |11111111|11111111|1110011 7ffff3 [23]
|
||||
(232) |11111111|11111111|101010 3fffea [22]
|
||||
(233) |11111111|11111111|101011 3fffeb [22]
|
||||
(234) |11111111|11111111|11110111|0 1ffffee [25]
|
||||
(235) |11111111|11111111|11110111|1 1ffffef [25]
|
||||
(236) |11111111|11111111|11110100 fffff4 [24]
|
||||
(237) |11111111|11111111|11110101 fffff5 [24]
|
||||
(238) |11111111|11111111|11111010|10 3ffffea [26]
|
||||
(239) |11111111|11111111|1110100 7ffff4 [23]
|
||||
(240) |11111111|11111111|11111010|11 3ffffeb [26]
|
||||
(241) |11111111|11111111|11111100|110 7ffffe6 [27]
|
||||
(242) |11111111|11111111|11111011|00 3ffffec [26]
|
||||
(243) |11111111|11111111|11111011|01 3ffffed [26]
|
||||
(244) |11111111|11111111|11111100|111 7ffffe7 [27]
|
||||
(245) |11111111|11111111|11111101|000 7ffffe8 [27]
|
||||
(246) |11111111|11111111|11111101|001 7ffffe9 [27]
|
||||
(247) |11111111|11111111|11111101|010 7ffffea [27]
|
||||
(248) |11111111|11111111|11111101|011 7ffffeb [27]
|
||||
(249) |11111111|11111111|11111111|1110 ffffffe [28]
|
||||
(250) |11111111|11111111|11111101|100 7ffffec [27]
|
||||
(251) |11111111|11111111|11111101|101 7ffffed [27]
|
||||
(252) |11111111|11111111|11111101|110 7ffffee [27]
|
||||
(253) |11111111|11111111|11111101|111 7ffffef [27]
|
||||
(254) |11111111|11111111|11111110|000 7fffff0 [27]
|
||||
(255) |11111111|11111111|11111011|10 3ffffee [26]
|
||||
EOS (256) |11111111|11111111|11111111|111111 3fffffff [30]"##;
|
||||
Reference in New Issue
Block a user