pngchat 1.0.1

Hide messages in the PNG file
Documentation 
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//! Hide messages in the PNG file.
//!
//! The intent of this little project is to learn how to encode PNG file and add some messages inside it
//!
//! Idea come from [PNGme: An Intermediate Rust Project](https://picklenerd.github.io/pngme_book/introduction.html)
//!
//! # Goal
//! Making a command line program that lets you hide secret messages in PNG files.
//!
//! The main tasks of `pngchat` are:
//! * Encode a message into a PNG file
//! * Decode a message stored in a PNG file
//! * Remove a message from a PNG file
//! * Print a list of PNG chunks that can be searched for messages
//!
//! # Uasge
//!
//! ```bash
//! # Encodes a message into a PNG file and saves the result
//! pngchat encode ./test.png ruSt "This is a hidden message"
//!
//! # Searches for a message hidden in a PNG file and prints the message if one is found
//! pngchat decode ./test.png ruSt
//!
//! # Removes a chunk from a PNG file and saves the result
//! pngchat remove ./test.png ruSt
//!
//! # Prints all of the chunks in a PNG file
//! pngchat print ./test.png
//! ```
//!
//!
//! # Links
//! See the [PNG file structure spec](http://www.libpng.org/pub/png/spec/1.2/PNG-Structure.html) for more details about how PNG file structured

pub mod args;
pub mod commands;

mod chunk;
mod chunk_type;
mod png;

mod error;
mod utils;

pub use error::{Error, Result};
pub use png::Png;

pub use utils::{checksum_32, u8_4_from_slice};

/// 4 bytes size
pub const CHUNK_SIZE: usize = 4;