Simple dhash calc

.gitignore

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+target/
+*.png

Cargo.lock

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Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "dhash"
+version = "0.1.0"
+authors = ["Julio Biason <julio.biason@pm.me>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+image = "0.23"

src/dhash.rs

@@ -0,0 +1,31 @@
+use image;
+
+pub enum DhashError {
+    FileDoesNotExist,
+}
+
+impl std::convert::From<image::error::ImageError> for DhashError {
+    fn from(_: image::error::ImageError) -> DhashError {
+        DhashError::FileDoesNotExist
+    }
+}
+
+pub fn dhash(filename: &str) -> Result<String, DhashError> {
+    let image = image::open(filename)?
+        .resize_exact(9, 8, image::imageops::FilterType::Nearest)
+        .grayscale();
+    let image_bytes = image
+        .to_bytes();
+    let mut all_hash: u64 = 0;
+    for byte in 0..8 {
+        let line = byte * 9;
+        for bits in 0..8 {
+            all_hash <<= 1;
+            if image_bytes[line + bits] > image_bytes[line + bits + 1] {
+                all_hash = all_hash | 0b00000001;
+            }
+        }
+    }
+
+    Ok(format!("{:#018x}", all_hash).into())
+}

src/main.rs

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+use std::env;
+
+mod dhash;
+
+fn main() {
+    let filename = env::args().nth(1).expect("Need a filename");
+    println!("{}: {}", dhash::dhash(&filename).unwrap_or("FAILURE".to_string()), filename);
+}