Updated docs

10 files changed, 716 insertions, 30 deletions

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diff --git a/Cargo.toml b/Cargo.toml
index 9a471d6..10ab85a 100644
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diff --git a/LICENSE-APACHE b/LICENSE-APACHE
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index 0000000..2ad6853
--- /dev/null
+++ b/LICENSE-APACHE
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+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
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+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
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+   Copyright 2024 Silas Bartha
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..dcc255f
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Silas Bartha
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/src/codec.rs b/src/codec.rs
index 03cdf15..8b38a9b 100644
--- a/src/codec.rs
+++ b/src/codec.rs
@@ -1,14 +1,26 @@
+/// Codecs enable the concealment of payload data inside the data of a carrier.
 pub trait Codec {
+    /// Data type representing the carrier.
     type Carrier;
+
+    /// Data type representing the payload.
     type Payload;
+
+    /// Data type representing encoder output/decoder input (usually the same as the carrier).
     type Output;
+
+    /// Type of errors produced by this codec.
     type Error;
 
-    fn encode(
-        &self,
-        carrier: impl Into<Self::Carrier>,
-        payload: impl Into<Self::Payload>,
-    ) -> Result<Self::Output, Self::Error>;
+    /// Embeds payload data inside carrier, returning the result.
+    fn encode<C, P>(&self, carrier: C, payload: P) -> Result<Self::Output, Self::Error>
+    where
+        C: Into<Self::Carrier>,
+        P: Into<Self::Payload>;
 
-    fn decode(&self, encoded: impl Into<Self::Output>) -> Result<(Self::Carrier, Self::Payload), Self::Error>;
+    /// Extracts payload data from an encoded carrier, returning the carrier with data removed and the
+    /// payload data.
+    fn decode<E>(&self, encoded: E) -> Result<(Self::Carrier, Self::Payload), Self::Error>
+    where
+        E: Into<Self::Output>;
 }
diff --git a/src/jpg/mod.rs b/src/jpeg/mod.rs
index 3d6bdc3..3d6bdc3 100644
--- a/src/jpg/mod.rs
+++ b/src/jpeg/mod.rs
diff --git a/src/jpg/segment.rs b/src/jpeg/segment.rs
index f54d0e2..b20ba3b 100644
--- a/src/jpg/segment.rs
+++ b/src/jpeg/segment.rs
@@ -5,8 +5,11 @@ use thiserror::Error;
 
 use crate::codec::Codec;
 
+/// Codec for storing payload data in JPEG comment (COM) segments. Can store an arbitrary amount of
+/// data, as long as the number of comment segments does not exceed u64::MAX.
 #[derive(Debug, PartialEq, Eq)]
 pub struct JpegSegmentCodec {
+    /// Index of segment to insert comments at.
     pub start_index: usize,
 }
 
@@ -16,7 +19,11 @@ impl Codec for JpegSegmentCodec {
     type Output = Self::Carrier;
     type Error = JpegSegmentError;
 
-    fn encode(&self, carrier: impl Into<Self::Carrier>, payload: impl Into<Self::Payload>) -> Result<Self::Output, Self::Error> {
+    fn encode<C, P>(&self, carrier: C, payload: P) -> Result<Self::Output, Self::Error>
+    where
+        C: Into<Self::Carrier>,
+        P: Into<Self::Payload>,
+    {
         let mut jpeg = match Jpeg::from_bytes(carrier.into().into()) {
             Ok(image) => image,
             Err(err) => return Err(JpegSegmentError::ParseFailed { inner: err })
@@ -31,7 +38,10 @@ impl Codec for JpegSegmentCodec {
         Ok(jpeg.encoder().bytes().to_vec())
     }
 
-    fn decode(&self, encoded: impl Into<Self::Output>) -> Result<(Self::Carrier, Self::Payload), Self::Error> {
+    fn decode<E>(&self, encoded: E) -> Result<(Self::Carrier, Self::Payload), Self::Error>
+    where
+        E: Into<Self::Output>,
+    {
         let mut jpeg = match Jpeg::from_bytes(encoded.into().into()) {
             Ok(image) => image,
             Err(err) => return Err(JpegSegmentError::ParseFailed { inner: err })
@@ -59,8 +69,13 @@ impl Default for JpegSegmentCodec {
     }
 }
 
+/// Errors thrown by the JPEG segment codec.
 #[derive(Error, Debug)]
 pub enum JpegSegmentError {
+    /// Parsing JPEG data failed.
     #[error("Failed to parse JPEG data: {inner:?}")]
-    ParseFailed { inner: img_parts::Error }
+    ParseFailed { 
+        /// Error thrown by parser.
+        inner: img_parts::Error,
+    }
 }
diff --git a/src/lib.rs b/src/lib.rs
index a1ed909..7cbae7c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,15 @@
-pub mod codec;
+#![warn(missing_docs)]
 
-#[cfg(feature = "jpg")]
-pub mod jpg;
+//! Library providing steganography codecs for various carrier and payload types, designed to be
+//! extensible.
 
+mod codec;
+pub use codec::*;
+
+/// Codecs for carriers in JPEG format.
+#[cfg(feature = "jpeg")]
+pub mod jpeg;
+
+/// Codecs for carriers in lossless image formats (PNG, WebP, etc.).
 #[cfg(feature = "lossless")]
 pub mod lossless;
diff --git a/src/lossless/champleve.rs b/src/lossless/lsb.rs
index 948408c..59dcc0b 100644
--- a/src/lossless/champleve.rs
+++ b/src/lossless/lsb.rs
@@ -5,21 +5,29 @@ use thiserror::Error;
 
 use crate::codec::Codec;
 
+/// Least-significant bit (LSB) steganography encodes data in the least-significant bits of colors
+/// in an image. This implementation reduces the colors in the carrier (irreversibly) in order to
+/// allow a byte of data to fit in each pixel of the image. 3 bits of data are encoded per pixel,
+/// and the 9th bit is used to signal the end of data.
 #[derive(Debug)]
-pub struct ChampleveCodec;
+pub struct LsbCodec;
 
-impl Codec for ChampleveCodec {
+impl Codec for LsbCodec {
     type Carrier = DynamicImage;
     type Payload = Vec<u8>;
     type Output = Self::Carrier;
-    type Error = ChampleveError;
+    type Error = LsbError;
 
-    fn encode(&self, carrier: impl Into<Self::Carrier>, payload: impl Into<Self::Payload>) -> Result<Self::Output, Self::Error> {
+    fn encode<C, P>(&self, carrier: C, payload: P) -> Result<Self::Output, Self::Error>
+    where
+        C: Into<Self::Carrier>,
+        P: Into<Self::Payload>,
+    {
         let mut image: DynamicImage = carrier.into();
         let payload: Vec<u8> = payload.into();
 
         if image.pixels().count() < payload.len() {
-            return Err(ChampleveError::PayloadTooBig);
+            return Err(LsbError::PayloadTooBig);
         }
 
         let mut payload_iter = payload.iter();
@@ -43,13 +51,16 @@ impl Codec for ChampleveCodec {
                     }
                 }
             },
-            _ => return Err(ChampleveError::UnsupportedFormat { format: image.color() })
+            _ => return Err(LsbError::UnsupportedFormat { format: image.color() })
         }
 
         Ok(image)
     }
 
-    fn decode(&self, carrier: impl Into<Self::Output>) -> Result<(Self::Carrier, Self::Payload), ChampleveError> {
+    fn decode<E>(&self, carrier: E) -> Result<(Self::Carrier, Self::Payload), LsbError>
+    where
+        E: Into<Self::Output>,
+    {
         let mut image: DynamicImage = carrier.into();
         let mut payload: Vec<u8> = Vec::new();
 
@@ -72,7 +83,7 @@ impl Codec for ChampleveCodec {
                     }
                 }
             },
-            _ => return Err(ChampleveError::UnsupportedFormat { format: image.color() })
+            _ => return Err(LsbError::UnsupportedFormat { format: image.color() })
         }
         
         Ok((image, payload))
@@ -128,12 +139,18 @@ fn decode_pixel<P: Pixel<Subpixel = u8>>(pixel: &mut P) -> Option<u8> {
     Some(payload_byte)
 }
 
+/// Errors thrown by the LSB Codec.
 #[derive(Error, Debug)]
-pub enum ChampleveError {
+pub enum LsbError {
+
+    /// Error thrown when payload is too big for the carrier.
     #[error("Payload is too big for the carrier. Choose a smaller payload or an image with greater pixel dimensions.")]
     PayloadTooBig,
+
+    /// Error thrown when pixel format is unsupported.
     #[error("Specified image format ({format:?}) is unsupported.")]
     UnsupportedFormat {
+        /// Provided (invalid) format.
         format: ColorType
     },
 }
diff --git a/src/lossless/mod.rs b/src/lossless/mod.rs
index a9ae225..a6bda54 100644
--- a/src/lossless/mod.rs
+++ b/src/lossless/mod.rs
@@ -1,2 +1,2 @@
-mod champleve;
-pub use champleve::*;
+mod lsb;
+pub use lsb::*;