Struct DctJpeg 

pub struct DctJpeg;

DCT-based JPEG steganography adapter (STUB).

NOT YET IMPLEMENTED: Requires a pure-Rust JPEG library that exposes DCT coefficients without unsafe code. Current Rust JPEG libraries either:

• Decode to pixels only (jpeg-decoder, image crate)
• Require unsafe bindings (mozjpeg-sys, libjpeg-turbo-sys)

TODO(T12): Implement DCT coefficient access and modification:

• Parse JPEG to access non-zero AC DCT coefficients
• Embed payload in LSBs of coefficients (skip DC and zeros)
• Preserve quantization and Huffman tables
• Re-encode JPEG with modified coefficients

Implementations

impl DctJpeg

pub const fn new() -> Self

Create a new DCT JPEG embedder.

Trait Implementations

impl Debug for DctJpeg

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for DctJpeg

fn default() -> DctJpeg

Returns the “default value” for a type.

impl EmbedTechnique for DctJpeg

fn technique(&self) -> StegoTechnique

The technique identifier for this implementation.

fn capacity(&self, _cover: &CoverMedia) -> Result<Capacity, StegoError>

Estimate how many payload bytes cover can hold.

fn embed( &self, _cover: CoverMedia, _payload: &Payload, ) -> Result<CoverMedia, StegoError>

Embed payload into cover, returning the stego cover.

impl ExtractTechnique for DctJpeg

fn technique(&self) -> StegoTechnique

The technique identifier for this implementation.

fn extract(&self, _cover: &CoverMedia) -> Result<Payload, StegoError>

Extract a hidden payload from stego.