Use bbp crate.

src/bbp.rs

@@ -1,102 +0,0 @@
-pub fn get_byte(id: i32) -> u8 {
-    let pid: f64 = 4.0 * series(1, id) - 2.0 * series(4, id) - series(5, id) - series(6, id);
-
-    let y: f64 = (pid - f64::from(pid as i32) + 1.0).abs();
-    let y = 16.0 * (y - y.floor());
-
-    ((y as u8) << 4) | (16.0 * (y - y.floor())) as u8
-}
-
-fn series(m: i32, id: i32) -> f64 {
-    const EPS: f64 = 1e-17;
-
-    let mut ak: f64;
-    let mut t: f64;
-    let mut s: f64 = 0.0;
-
-    for k in 0..id {
-        ak = f64::from(8 * k + m);
-        t = expm(f64::from(id - k), ak);
-
-        s += t / ak;
-        s -= s.trunc();
-    }
-
-    for k in id..id + 101 {
-        ak = f64::from(8 * k + m);
-        t = 16f64.powi(id - k) / ak;
-
-        if t < EPS {
-            break;
-        }
-
-        s += t;
-        s -= s.trunc();
-    }
-
-    s
-}
-
-fn expm(p: f64, ak: f64) -> f64 {
-    if ak == 1.0 {
-        return 0.0;
-    }
-
-    const NTP: usize = 25;
-
-    lazy_static! {
-        static ref TP: [f64; NTP] = {
-            let mut v = [1f64; NTP];
-
-            for i in 1..NTP {
-                v[i] = 2.0 * v[i - 1];
-            }
-
-            v
-        };
-    }
-
-    let mut i: usize = 0;
-
-    while TP[i] <= p {
-        i += 1;
-    }
-
-    let mut pt = TP[i - 1];
-    let mut p = p;
-    let mut r: f64 = 1.0;
-
-    for _ in 1..i + 1 {
-        if p >= pt {
-            r *= 16.0;
-            r -= (r / ak).trunc() * ak;
-
-            p -= pt;
-        }
-
-        pt *= 0.5;
-
-        if pt >= 1.0 {
-            r *= r;
-            r -= (r / ak).trunc() * ak;
-        }
-    }
-
-    r
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_get_byte() {
-        assert_eq!(36, get_byte(0));
-        assert_eq!(67, get_byte(1));
-        assert_eq!(63, get_byte(2));
-
-        assert_eq!(163, get_byte(10));
-
-        assert_eq!(41, get_byte(100));
-    }
-}

src/lib.rs

@@ -1 +0,0 @@
-

src/main.rs

@@ -1,11 +1,8 @@
-
+extern crate bbp;
 extern crate byteorder;
 extern crate getopts;
-#[macro_use]
-extern crate lazy_static;
 extern crate pbr;
 
-
 use std::env;
 use std::fs;
 use std::io::BufReader;
@@ -18,10 +15,6 @@ use getopts::Options;
 use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 use pbr::{ProgressBar, Units};
 
-
-mod bbp;
-
-
 struct Pi {
     next: i32,
     map: BTreeMap<u8, i32>,
@@ -40,7 +33,7 @@ impl Pi {
             self.map[&byte]
         } else {
             for i in self.next..i32::MAX {
-                if byte == bbp::get_byte(i) {
+                if byte == bbp::byte_at(i) {
                     self.map.insert(byte, i);
 
                     return i;
@@ -52,7 +45,6 @@ impl Pi {
     }
 }
 
-
 fn print_usage(program: &str, opts: &Options) {
     let brief = format!("Usage: {} [option] INPUT OUTPUT", program);
     print!("{}", opts.usage(&brief));
@@ -156,7 +148,7 @@ fn extract(input: &str, output: &str) {
         let mut c = Cursor::new(&buf);
         let index = c.read_i32::<LittleEndian>().unwrap();
 
-        output_file.write_all(&[bbp::get_byte(index)]).unwrap();
+        output_file.write_all(&[bbp::byte_at(index)]).unwrap();
 
         pb.add(size as u64);
     }