sp3 1.4.1

IGS SP3 file parser
Documentation 
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use std::{io::Write, str::from_utf8};

#[derive(Debug)]
pub struct Utf8Buffer {
    pub inner: Vec<u8>,
}

impl Write for Utf8Buffer {
    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
        for b in buf {
            self.inner.push(*b);
        }
        Ok(buf.len())
    }

    fn flush(&mut self) -> std::io::Result<()> {
        self.inner.clear();
        Ok(())
    }
}

impl Utf8Buffer {
    pub fn new(capacity: usize) -> Self {
        Self {
            inner: Vec::with_capacity(capacity),
        }
    }

    pub fn to_ascii_utf8(&self) -> String {
        from_utf8(&self.inner).unwrap().to_string()
    }
}