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use crate::read::EbmlSize;
use self::read::EbmlReader;
use anyhow::{bail, Result};
use log::debug;
pub mod matroska;
pub mod read;
pub mod write;
#[derive(Debug, Clone)]
pub enum Master {
Start,
End,
}
#[derive(Debug, Clone)]
pub enum MatroskaTag {
Ebml(Master),
EbmlVersion(u64),
EbmlReadVersion(u64),
EbmlMaxIdLength(u64),
EbmlMaxSizeLength(u64),
DocType(String),
DocTypeVersion(u64),
DocTypeReadVersion(u64),
DocTypeExtension(Master),
}
impl EbmlReader {
pub fn read_tag(&mut self) -> Result<MatroskaTag> {
let id = self.read_tag_id()?;
let size = EbmlSize::from_vint(self.read_vint_len()?);
debug!("tag id={id:x}, size={size:?}");
Ok(match id {
0x1a45dfa3 => MatroskaTag::Ebml(Master::Start),
0x4286 => MatroskaTag::EbmlVersion(self.read_vint()?),
0x42f7 => MatroskaTag::EbmlReadVersion(self.read_vint()?),
0x42f2 => MatroskaTag::EbmlMaxIdLength(self.read_vint()?),
0x42f3 => MatroskaTag::EbmlMaxSizeLength(self.read_vint()?),
0x4282 => MatroskaTag::DocType(self.read_utf8(size)?),
0x4287 => MatroskaTag::DocTypeVersion(self.read_vint()?),
0x4285 => MatroskaTag::DocTypeReadVersion(self.read_vint()?),
0x4281 => MatroskaTag::DocTypeExtension(Master::Start),
_ => bail!("thats not a tag we know..."),
})
}
}
pub trait ValueFromBuf: Sized {
fn from_buf(buf: &[u8]) -> anyhow::Result<Self>;
}
impl ValueFromBuf for u64 {
fn from_buf(buf: &[u8]) -> anyhow::Result<Self> {
if buf.len() != 8 {
bail!("u64 is not 64 bits long")
}
Ok((buf[0] as u64) << 24
| (buf[1] as u64) << 16
| (buf[2] as u64) << 8
| (buf[3] as u64) << 0)
}
}
impl ValueFromBuf for Vec<u8> {
fn from_buf(buf: &[u8]) -> anyhow::Result<Self> {
Ok(buf.to_vec())
}
}
impl ValueFromBuf for String {
fn from_buf(buf: &[u8]) -> anyhow::Result<Self> {
Ok(String::from_utf8(Vec::from(buf))?)
}
}
impl ValueFromBuf for Master {
fn from_buf(_buf: &[u8]) -> anyhow::Result<Self> {
Ok(Master::Start)
}
}
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