From 534992ff3816e5066f6b8c53b4bc877c7c7afdef Mon Sep 17 00:00:00 2001
From: 2ndbeam <2ndbeam@disroot.org>
Date: Wed, 17 Sep 2025 10:49:23 +0300
Subject: [PATCH] initial

---
 .gitignore  |   1 +
 Cargo.lock  | 511 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |  10 +
 src/lib.rs  |  74 ++++++++
 src/main.rs |  10 +
 5 files changed, 606 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/lib.rs
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a85ac13
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,511 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
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+ "memchr",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..9297ac4
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,10 @@
+[package]
+name = "geotiff_parser"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+byteorder = "1.5.0"
+clap = { version = "4.5.47", features = ["derive"] }
+geo-types = "0.7.17"
+geotiff = "0.1.0"
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..d0eb486
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,74 @@
+use byteorder::{LittleEndian, WriteBytesExt};
+use clap::Parser;
+use std::{error::Error, fs::{read_to_string, File}, path::PathBuf};
+use geotiff::GeoTiff;
+use geo_types::Coord;
+
+
+/// Parse GeoTIFF to use with KtHeightMap
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+pub struct Args {
+    /// Path to GeoTIFF
+    #[arg(short, long)]
+    tiff: PathBuf,
+    /// Path to TFW World File
+    #[arg(short, long)]
+    world: PathBuf,
+}
+
+pub fn parse_geotiff(args: Args) -> Result<(), Box<dyn Error>> {
+    let out_path: PathBuf = PathBuf::from("out.khm");
+    
+    let tiff = File::open(args.tiff)?;
+    let geotiff = GeoTiff::read(tiff)?;
+    
+    let tfw: Vec<f64> = read_to_string(args.world)?
+        .trim()
+        .split('\n')
+        .map(|val| val.trim().parse::<f64>().unwrap())
+        .collect();
+    
+    let min_lon = tfw[4];
+    let max_lon = min_lon + tfw[0] * geotiff.raster_height as f64;
+
+    let min_lat = tfw[5];
+    let max_lat = min_lat + tfw[3] * geotiff.raster_width as f64;
+
+    println!("Upper Left Corner: ({},{})\nLower Right Corner: ({},{})",
+        min_lon, min_lat, max_lon, max_lat);
+    
+    let mut buffer = File::create(out_path.clone())?;
+
+    // Header:
+    // f32 min_lon
+    // f32 min_lat
+    // f32 lon_per_pixel
+    // f32 lat_per_pixel
+    // u32 raster_width
+    // u32 raster_height
+    buffer.write_f32::<LittleEndian>(min_lon as f32)?;
+    buffer.write_f32::<LittleEndian>(min_lat as f32)?;
+    buffer.write_f32::<LittleEndian>(tfw[0] as f32)?;
+    buffer.write_f32::<LittleEndian>(tfw[3] as f32)?;
+    buffer.write_u32::<LittleEndian>(geotiff.raster_width as u32)?;
+    buffer.write_u32::<LittleEndian>(geotiff.raster_height as u32)?;
+
+    // Body: u16 height
+    for x in 0..geotiff.raster_width {
+        let lon = min_lon + tfw[0] * x as f64;
+        for y in 0..geotiff.raster_height {
+            let lat = min_lat + tfw[3] * y as f64;
+            let height = geotiff
+                .get_value_at::<i16>(&Coord {x: lon, y: lat}, 0)
+                .unwrap_or(0);
+            let bufheight = if height >= 0 {height as u16} else {0u16};
+            buffer.write_u16::<LittleEndian>(bufheight)?;
+            println!("Written {}%", (x as f64 * 100 as f64 / geotiff.raster_width as f64) as u8);
+        }
+    }
+
+    println!("Data was written to {}", out_path.display());
+
+    Ok(())
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..922fb5e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,10 @@
+use clap::Parser;
+use geotiff_parser::{parse_geotiff, Args};
+
+fn main() {
+    let args = Args::parse();
+
+    if let Err(error) = parse_geotiff(args) {
+        eprintln!("Error happened: {error}");
+    }
+}