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use anyhow::{bail, Result};
use std::io::Write;
pub struct EbmlWriter<T> {
inner: T,
position: usize,
}
impl<T: Write> EbmlWriter<T> {
pub fn new(inner: T, position: usize) -> Self {
Self { inner, position }
}
pub fn write(&mut self, data: &[u8]) -> Result<()> {
self.inner.write_all(data)?;
self.position += data.len();
Ok(())
}
pub fn write_vint(&mut self, i: u64) -> Result<()> {
if i > (1 << 56) - 1 {
bail!("vint does not fit");
}
let mut len = 1;
while len <= 8 {
if i < (1 << ((7 * len) - 1)) {
break;
}
len += 1;
}
let mut bytes = i.to_be_bytes();
bytes[0] |= 1 << (8 - len);
self.write(&bytes)
}
}
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