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//! sha256 crypto digest util
//!
//! ```rust
//!
//! use sha256::{digest,digest_bytes,digest_file};
//!
//! //sha256 digest string
//! let input = "hello";
//! let val = digest(input);
//! assert_eq!(val,"2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824");
//!
//! //sha256 digest bytes
//! let input = b"hello";
//! let val = digest_bytes(input);
//! assert_eq!(val,"2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824");
//!
//! //sha256 digest file
//! use std::path::Path;
//! let input = Path::new("./foo.file");
//! let val = digest_file(input).unwrap();
//! assert_eq!(val,"433855b7d2b96c23a6f60e70c655eb4305e8806b682a9596a200642f947259b1");
//!
//! ```

use sha2::Digest;
use std::fs;
use std::io;
use std::path::Path;

/// sha256 digest string
///
/// # Examples
///
/// ```rust
/// use sha256::digest;
/// let input = "hello";
/// let val = digest(input);
/// assert_eq!(val,"2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824")
/// ```
///
pub fn digest<S: Into<String>>(input: S) -> String {
    __digest__(input.into().as_bytes())
}

/// sha256 digest bytes
///
/// # Examples
///
/// ```rust
/// use sha256::digest_bytes;
/// let input = b"hello";
/// let val = digest_bytes(input);
/// assert_eq!(val,"2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824")
/// ```
///
pub fn digest_bytes(input: &[u8]) -> String {
    __digest__(input)
}

/// sha256 digest file
///
/// # Examples
///
/// ```rust
/// use sha256::digest_file;
/// use std::path::Path;
/// let input = Path::new("./foo.file");
/// let val = digest_file(input).unwrap();
/// assert_eq!(val,"433855b7d2b96c23a6f60e70c655eb4305e8806b682a9596a200642f947259b1")
/// ```
///
pub fn digest_file<P: AsRef<Path>>(path: P) -> Result<String, io::Error> {
    let bytes = fs::read(path)?;
    Ok(__digest__(&bytes))
}

fn __digest__(data: &[u8]) -> String {
    hex::encode(sha2::Sha256::digest(data))
}