feat: extract radar data to image

.gitignore

@@ -1 +1,4 @@
 /target
+
+input
+rv.png

Cargo.lock

@@ -0,0 +1,124 @@
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+# It is not intended for manual editing.
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+ "miniz_oxide",
+]
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+ "num-traits",
+ "png",
+]
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+ "miniz_oxide",
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+dependencies = [
+ "image",
+]

Cargo.toml

@@ -4,3 +4,4 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+image = { version = "0.25.6", default-features = false, features = ["png"] }

src/main.rs

@@ -1,3 +1,44 @@
-fn main() {
-    println!("Hello, world!");
+use std::fs;
+
+use image::imageops;
+use image::GrayAlphaImage;
+
+enum State {
+    Header,
+    Lsb,
+    Msb(u8),
+}
+
+fn main() {
+    let mut state = State::Header;
+    let mut data = Vec::with_capacity(1100 * 1200 * 2);
+
+    for b in fs::read("input").unwrap() {
+        match state {
+            State::Header if b == 3 => {
+                state = State::Lsb;
+            }
+            State::Header => (),
+            State::Lsb => {
+                state = State::Msb(b);
+            }
+            State::Msb(lsb) => {
+                let v = u16::from_le_bytes([lsb, b]);
+
+                if v == 0x29c4 {
+                    data.push(0);
+                    data.push(255);
+                } else {
+                    data.push(if v > 0 { 255 } else { 127 });
+                    data.push(255);
+                }
+
+                state = State::Lsb;
+            }
+        };
+    }
+
+    let mut img = GrayAlphaImage::from_raw(1100, 1200, data).unwrap();
+    imageops::flip_vertical_in_place(&mut img);
+    img.save("rv.png").unwrap();
 }