exact-read

The exact-read crate is an IO buffering library that provides reservation-based buffering for efficient data reading from files. Reservation-based buffering allows deciding buffer size hand at any time. That allows minimum I/O operation for expensive systems like networks. Additionally, the crate supports virtually-concatenated files, allowing separated files to be treated and seek/read as if they were concatenated into one continuous stream.

Since MultiFile, File, and ExactReader use and implement Seek + Read, these structs can be used separately without requiring them to be chained.

```rust use std::io::{Cursor, Read};

use exact_reader::{MultiFile, File, ExactReader};

fn intofile(value: Cursor>) -> File>> { let len = value.getref().len(); File { file: value, size: len, filename: "cursor".to_string(), } }

fn main() { let a: Cursor> = Cursor::new(vec![1u8, 2, 3]); let b: Cursor> = Cursor::new(vec![4u8, 5, 6]);

let mut multifile = MultiFile::new(vec![into_file(a), into_file(b)]);
let mut reader = ExactReader::new_multi(multifile);
reader.reserve(6);

let mut buf = [0u8; 4];
reader.read(&mut buf).unwrap();

assert_eq!(buf, [1, 2, 3, 4])

} ```