car-utils 0.1.0

This crate is the ipfs car file reader writer and utils.
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use std::{path::Path, fs::File};

use crate::error::UtilError;
use rust_car::reader::{self as car_reader, CarReader};
use rust_car::utils::extract_ipld;

/// extract car file to local file system.
/// `car` the car file for extract.
/// `target` target directory to extract.
pub(crate) fn extract_car(
    car: impl AsRef<Path>,
    target: Option<&String>
) -> Result<(), UtilError> {
    let path = car.as_ref();
    if !path.exists() {
        return Err(UtilError::new(format!("car file [{}] is not exist.", path.to_str().unwrap())));
    }
    let file = File::open(path)?;
    let mut reader = car_reader::new_v1(file)?;
    let roots = reader.header().roots();
    for cid in roots {
        extract_ipld(&mut reader, cid, target)?;
    }
    Ok(())
}