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use std::iter;
use std::io::{Read,Error,ErrorKind};
static NSTRS: &'static str = "C C#D D#E F F#G G#A A#B ";
pub fn note_num_to_name(num: u32) -> String {
let oct = (num as f32 /12 as f32).floor()-1.0;
let nmt = ((num%12)*2) as usize;
let slice =
if NSTRS.as_bytes()[nmt+1] == ' ' as u8{
&NSTRS[nmt..(nmt+1)]
} else {
&NSTRS[nmt..(nmt+2)]
};
format!("{}{}",slice,oct)
}
pub fn read_byte(reader: &mut Read) -> Result<u8,Error> {
let mut b = [0; 1];
try!(reader.read(&mut b));
Ok(b[0])
}
pub fn fill_buf(reader: &mut Read, buf: &mut [u8]) -> Result<(),Error> {
let mut read = 0;
while read < buf.len() {
read += try!(reader.read(&mut buf[read..]));
}
Ok(())
}
pub fn read_amount(reader: &mut Read, dest: &mut Vec<u8>, amt: usize) -> Result<(),Error> {
let start_len = dest.len();
let mut len = start_len;
if dest.capacity() < start_len + amt {
dest.extend(iter::repeat(0).take(amt));
}
let mut ret = Ok(());
while (len-start_len) < amt {
match reader.read(&mut dest[len..]) {
Ok(0) => {
ret = Err(Error::new(ErrorKind::InvalidData,
"Stream ended before specified number of bytes could be read"));
},
Ok(n) => len += n,
Err(ref e) if e.kind() == ErrorKind::Interrupted => {}
Err(e) => {
ret = Err(e);
break;
}
}
}
dest.truncate(len);
ret
}
#[test]
fn test_note_num_to_name() {
assert_eq!(¬e_num_to_name(48)[..],"C3");
assert_eq!(¬e_num_to_name(49)[..],"C#3");
assert_eq!(¬e_num_to_name(65)[..],"F4");
assert_eq!(¬e_num_to_name(104)[..],"G#7");
}