Dynamically choose static or streaming based on size.

Previously, all invocations with `-f`, to give a file as input, would default to streaming. Now,
though, it will try to statically turn it into a qr code, and failing that, will stream it as raptor
packets.

.rustfmt.toml

@@ -0,0 +1,4 @@
+imports_granularity = "Crate"
+group_imports = "StdExternalCrate"
+wrap_comments = true
+edition = "2021"

src/lib.rs

@@ -1,39 +1,85 @@
-use std::fmt::Debug;
+use std::{fmt::Debug, time::Duration};
 
+use eframe::egui;
+use egui_extras::RetainedImage;
+use fast_qr::convert::image::ImageBuilder;
+use rand::seq::SliceRandom;
+use raptorq::{Encoder, ObjectTransmissionInformation};
 use rkyv::{Archive, Deserialize, Serialize};
 
-#[derive(Archive, Deserialize, Serialize, PartialEq, Eq, Clone)]
+pub const STREAMING_MTU: u16 = 776;
-pub enum MessageData {
-    Text(String),
-    Data(Vec<u8>),
-}
 
-impl Debug for MessageData {
+pub type Receiver = std::sync::mpsc::Receiver<Vec<u8>>;
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+pub type Sender = std::sync::mpsc::SyncSender<Vec<u8>>;
-        match self {
-            Self::Text(msg_txt) => f.debug_tuple("Text").field(msg_txt).finish(),
-            Self::Data(data) => f
-                .debug_tuple("Data")
-                .field(&format!("{} bytes", data.len()))
-                .finish(),
-        }
-    }
-}
 
-#[derive(Archive, Deserialize, Serialize, Debug, PartialEq, Eq, Clone)]
+#[derive(Debug, Clone, PartialEq, Eq, Archive, Serialize, Deserialize)]
-pub struct Message {
+pub struct TxConfig {
+    pub len: u64,
+    pub mtu: u16,
     pub description: String,
-    pub data: MessageData,
 }
 
-impl Message {
+pub fn mk_img(bytes: &[u8]) -> RetainedImage {
-    pub fn new(data: MessageData, desc: Option<&str>) -> Self {
+    let qr = fast_qr::QRBuilder::new(bytes).build().unwrap();
-        let description = if let Some(desc) = desc {
+    let bytes = ImageBuilder::default()
-            desc.to_owned()
+        .fit_width(1100)
+        .to_pixmap(&qr)
+        .encode_png()
+        .unwrap();
+
+    RetainedImage::from_image_bytes("generated qr code", &bytes).unwrap()
+}
+
+pub fn stream_bytes(bytes: Vec<u8>, tx: Sender, rate: u64) {
+    let sleep = (1000.0 / rate as f64) as u64;
+
+    std::thread::spawn(move || {
+        let rng = &mut rand::thread_rng();
+        let config =
+            ObjectTransmissionInformation::with_defaults(bytes.len() as u64, STREAMING_MTU);
+        let encoder = Encoder::new(&bytes, config);
+        let mut packets = encoder
+            .get_encoded_packets(10)
+            .iter()
+            .map(|p| p.serialize())
+            .collect::<Vec<_>>();
+        packets.shuffle(rng);
+
+        for (_counter, packet) in packets.iter().cycle().enumerate() {
+            tx.send(packet.clone()).unwrap();
+            std::thread::sleep(Duration::from_millis(sleep));
+        }
+    });
+}
+
+pub struct Flasher {
+    pub heading: String,
+    pub content: Content,
+    pub rate: u64,
+}
+
+pub enum Content {
+    Static(&'static [u8]),
+    Streaming(Receiver),
+}
+
+impl eframe::App for Flasher {
+    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
+        let sleep = 1000.0 / self.rate as f64;
+        ctx.request_repaint_after(Duration::from_millis(sleep as u64));
+        egui::CentralPanel::default().show(ctx, |ui| {
+            ui.heading(&self.heading);
+            let img = match self.content {
+                Content::Static(bytes) => mk_img(bytes),
+                Content::Streaming(ref rx) => {
+                    if let Ok(bytes) = rx.try_recv() {
+                        mk_img(&bytes)
                     } else {
-            "none".to_owned()
+                        return;
+                    }
+                }
             };
-
+            img.show(ui);
-        Message { description, data }
+        });
     }
 }

src/main.rs

@@ -1,13 +1,8 @@
-use std::{ffi::OsString, time::Duration};
+use std::ffi::OsString;
 
 use clap::Parser;
+use cuttle::{stream_bytes, Content, Flasher};
 use eframe::egui;
-use egui_extras::RetainedImage;
-use fast_qr::convert::image::ImageBuilder;
-use rand::seq::SliceRandom;
-use raptorq::{Encoder, ObjectTransmissionInformation};
-
-pub const MTU: u16 = 776;
 
 #[derive(Parser, Debug)]
 #[clap(author, version, trailing_var_arg = true)]
@@ -34,33 +29,24 @@ fn main() -> Result<(), eframe::Error> {
 
     let cli = Cli::parse();
 
-    let flasher = if let Some(ref file) = cli.file {
+    let description = if let Some(ref file) = cli.file {
-        let (tx, rx) = std::sync::mpsc::sync_channel(1);
+        let text = cli.text().join(" ");
-        let content = Content::Streaming(rx);
+        let sep = if text.is_empty() { "" } else { ": " };
-        let heading = if cli.text.is_empty() {
+        let file = std::path::Path::new(&file)
-            file.to_string_lossy().to_string()
+            .file_name()
+            .unwrap_or_default()
+            .to_string_lossy();
+        format!("{file}{sep}{text}")
     } else {
-            cli.text().join(" ")
+        "text message".to_string()
     };
 
-        stream_file(file, tx, cli.rate);
+    let content: Content = get_content(&cli);
 
-        Flasher {
+    let flasher = Flasher {
-            heading,
+        heading: description,
         content,
         rate: cli.rate,
-        }
-    } else {
-        let heading = "text message".to_string();
-        let bytes: Vec<u8> = cli.text().join(" ").bytes().collect();
-        let bytes = bytes.leak();
-        let content = Content::Static(bytes);
-
-        Flasher {
-            heading,
-            content,
-            rate: cli.rate,
-        }
     };
 
     let options = eframe::NativeOptions {
@@ -77,69 +63,19 @@ fn main() -> Result<(), eframe::Error> {
     )
 }
 
-struct Flasher {
+fn get_content(cli: &Cli) -> Content {
-    pub heading: String,
+    let bytes = if let Some(ref file) = cli.file {
-    pub content: Content,
+        std::fs::read(file).unwrap_or_else(|e| panic!("tried to open {file:?}, got {e:?}"))
-    pub rate: u64,
-}
-
-enum Content {
-    Static(&'static [u8]),
-    Streaming(std::sync::mpsc::Receiver<Vec<u8>>),
-}
-
-impl eframe::App for Flasher {
-    fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
-        let sleep = 1000.0 / self.rate as f64;
-        ctx.request_repaint_after(Duration::from_millis(sleep as u64));
-        egui::CentralPanel::default().show(ctx, |ui| {
-            ui.heading(&self.heading);
-            let img = match self.content {
-                Content::Static(bytes) => mk_img(bytes),
-                Content::Streaming(ref rx) => {
-                    if let Ok(bytes) = rx.try_recv() {
-                        mk_img(&bytes)
     } else {
-                        return;
+        cli.text().join(" ").bytes().collect()
-                    }
-                }
     };
-            img.show(ui);
+
-        });
+    if bytes.len() < 1700 && fast_qr::QRBuilder::new(bytes.clone()).build().is_ok() {
+        let bytes = bytes.leak();
+        Content::Static(bytes)
+    } else {
+        let (tx, rx) = std::sync::mpsc::sync_channel(2);
+        stream_bytes(bytes, tx, cli.rate);
+        Content::Streaming(rx)
     }
 }
-
-fn mk_img(bytes: &[u8]) -> RetainedImage {
-    let qr = fast_qr::QRBuilder::new(bytes).build().unwrap();
-    let bytes = ImageBuilder::default()
-        .fit_width(1100)
-        .to_pixmap(&qr)
-        .encode_png()
-        .unwrap();
-
-    RetainedImage::from_image_bytes("generated qr code", &bytes).unwrap()
-}
-
-fn stream_file(file: &OsString, tx: std::sync::mpsc::SyncSender<Vec<u8>>, rate: u64) {
-    let bytes = std::fs::read(file).unwrap_or_else(|e| panic!("tried to open {file:?}, got {e:?}"));
-
-    let sleep = (1000.0 / rate as f64) as u64;
-
-    std::thread::spawn(move || {
-        let rng = &mut rand::thread_rng();
-        let config = ObjectTransmissionInformation::with_defaults(bytes.len() as u64, MTU);
-        let encoder = Encoder::new(&bytes, config);
-        let mut packets = encoder
-            .get_encoded_packets(10)
-            .iter()
-            .map(|p| p.serialize())
-            .collect::<Vec<_>>();
-        packets.shuffle(rng);
-        dbg!(&packets.len());
-
-        for (_counter, packet) in packets.iter().cycle().enumerate() {
-            tx.send(packet.clone()).unwrap();
-            std::thread::sleep(Duration::from_millis(sleep));
-        }
-    });
-}