rusdu 0.1.1

Rust rewrite of ncdu — NCurses Disk Usage analyzer
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use anyhow::{Context, Result};
use std::fs::File;
use std::io::{Read, Write};
use std::path::Path;

pub fn read_file_maybe_compressed(path: &Path) -> Result<Vec<u8>> {
    let mut file = File::open(path).with_context(|| format!("Failed to open file {:?}", path))?;
    let mut buffer = Vec::new();
    file.read_to_end(&mut buffer)?;

    // Check if the file starts with the Zstandard magic header (0x28B52FFD)
    if buffer.len() >= 4 && &buffer[0..4] == &[0x28, 0xB5, 0x2F, 0xFD] {
        let decompressed =
            zstd::stream::decode_all(&buffer[..]).context("Failed to decompress Zstandard file")?;
        return Ok(decompressed);
    }

    Ok(buffer)
}

pub fn write_compressed_file(path: &Path, data: &[u8], level: i32) -> Result<()> {
    let file = File::create(path).with_context(|| format!("Failed to create file {:?}", path))?;
    let mut encoder = zstd::stream::Encoder::new(file, level)
        .context("Failed to initialize Zstandard encoder")?;
    encoder.write_all(data)?;
    encoder.finish()?;
    Ok(())
}