mp4-edit 0.1.1

mp4 read/write library designed with audiobooks in mind
Documentation 
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use derive_more::Deref;
use std::fmt;

#[derive(Default, Clone, Copy, Deref, PartialEq, Eq)]
pub struct FourCC(pub(crate) [u8; 4]);

impl FourCC {
    pub const fn new(typ: &[u8; 4]) -> Self {
        Self(*typ)
    }

    pub fn into_bytes(self) -> [u8; 4] {
        self.0
    }

    pub fn as_bytes(&self) -> &[u8; 4] {
        &self.0
    }

    pub fn as_str(&self) -> &str {
        std::str::from_utf8(&self.0).unwrap_or("????")
    }
}

impl From<[u8; 4]> for FourCC {
    fn from(value: [u8; 4]) -> Self {
        FourCC(value)
    }
}

impl PartialEq<&[u8; 4]> for FourCC {
    fn eq(&self, other: &&[u8; 4]) -> bool {
        &self.0 == *other
    }
}

impl PartialEq<[u8; 4]> for FourCC {
    fn eq(&self, other: &[u8; 4]) -> bool {
        &self.0 == other
    }
}

impl fmt::Display for FourCC {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let fourcc = std::str::from_utf8(&self.0)
            .map_or_else(|_| convert_mac_roman_to_utf8(&self.0), ToOwned::to_owned);
        if fourcc
            .trim_matches(|c| !char::is_ascii_alphanumeric(&c))
            .is_empty()
        {
            // show bytes when not valid
            fmt::Debug::fmt(&self.0, f)
        } else {
            write!(f, "{fourcc}")
        }
    }
}

impl fmt::Debug for FourCC {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "FourCC({self})")
    }
}

fn convert_mac_roman_to_utf8(bytes: &[u8]) -> String {
    let mut result = String::new();
    for &byte in bytes {
        match byte {
            0xA9 => result.push('©'), // Copyright symbol
            0xAE => result.push('®'), // Registered trademark symbol
            0x99 => result.push('™'), // Trademark symbol
            // For other bytes, treat as ASCII if valid, otherwise use replacement char
            b if b.is_ascii() => result.push(b as char),
            _ => result.push('�'),
        }
    }
    result
}