stfs 0.1.0

Parser for Xbox 360 STFS (Secure Transacted File System) packages
Documentation 
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use std::ops::Range;

use crate::error::StfsError;

pub trait ReadAt {
	fn read_at(&self, range: Range<usize>) -> Result<impl AsRef<[u8]>, StfsError>;
}

pub struct SliceReader<'a>(pub &'a [u8]);

impl<'a> ReadAt for SliceReader<'a> {
	fn read_at(&self, range: Range<usize>) -> Result<impl AsRef<[u8]>, StfsError> {
		if range.end > self.0.len() {
			return Err(StfsError::ReadError {
				offset: range.start,
				message: format!("read range {}..{} exceeds data length {}", range.start, range.end, self.0.len()),
			});
		}
		Ok(&self.0[range])
	}
}

impl ReadAt for Vec<u8> {
	fn read_at(&self, range: Range<usize>) -> Result<impl AsRef<[u8]>, StfsError> {
		if range.end > self.len() {
			return Err(StfsError::ReadError {
				offset: range.start,
				message: format!("read range {}..{} exceeds data length {}", range.start, range.end, self.len()),
			});
		}
		Ok(&self[range])
	}
}