voxj-codec 0.1.1

Encodes voxj types into .voxj / .voxjz documents.
Documentation 
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use crate::{Error, Result};
use flate2::read::DeflateDecoder;
use std::io::Read;

/// Inflates the single deflate member of a `.voxjz` archive back to its `.voxj`
/// bytes: the inverse of [`wrap_voxjz`](crate::wrap_voxjz). The deflate stream
/// ends itself, so any trailing zip central-directory bytes are ignored.
pub fn unwrap_voxjz(bytes: &[u8]) -> Result<Vec<u8>> {
    let invalid = || Error::Invalid("malformed .voxjz archive".to_owned());
    if bytes.len() < 30 || bytes[0..4] != [0x50, 0x4b, 0x03, 0x04] {
        return Err(invalid());
    }
    let name_len = u16::from_le_bytes([bytes[26], bytes[27]]) as usize;
    let extra_len = u16::from_le_bytes([bytes[28], bytes[29]]) as usize;
    let compressed = bytes.get(30 + name_len + extra_len..).ok_or_else(invalid)?;
    let mut out = Vec::new();
    DeflateDecoder::new(compressed)
        .read_to_end(&mut out)
        .map_err(|e| Error::Invalid(format!("malformed .voxjz deflate stream: {e}")))?;
    Ok(out)
}