Move sanity checks to separate file

src/lib.rs

@@ -60,6 +60,8 @@ mod headers;
 mod interlace;
 mod png;
 mod reduction;
+#[cfg(feature = "sanity-checks")]
+mod sanity_checks;
 
 /// Private to oxipng; don't use outside tests and benches
 #[doc(hidden)]
@@ -70,6 +72,8 @@ pub mod internal_tests {
     pub use crate::headers::*;
     pub use crate::png::*;
     pub use crate::reduction::*;
+    #[cfg(feature = "sanity-checks")]
+    pub use crate::sanity_checks::*;
 }
 
 #[derive(Clone, Debug)]
@@ -597,7 +601,7 @@ fn optimize_png(
     }
 
     #[cfg(feature = "sanity-checks")]
-    debug_assert!(sanity_checks::validate_output(&output, original_data));
+    assert!(sanity_checks::validate_output(&output, original_data));
 
     Ok(output)
 }
@@ -1070,55 +1074,3 @@ fn copy_times(input_path_meta: &Metadata, out_path: &Path) -> PngResult<()> {
         ))
     })
 }
-
-#[cfg(feature = "sanity-checks")]
-mod sanity_checks {
-    use super::*;
-    use image::{DynamicImage, GenericImageView, ImageFormat, Pixel};
-    use log::error;
-    use std::io::Cursor;
-
-    /// Validate that the output png data still matches the original image
-    pub(super) fn validate_output(output: &[u8], original_data: &[u8]) -> bool {
-        let (old_png, new_png) = rayon::join(
-            || load_png_image_from_memory(original_data),
-            || load_png_image_from_memory(output),
-        );
-
-        match (new_png, old_png) {
-            (Err(new_err), _) => {
-                error!("Failed to read output image for validation: {}", new_err);
-                false
-            }
-            (_, Err(old_err)) => {
-                // The original image might be invalid if, for example, there is a CRC error,
-                // and we set fix_errors to true. In that case, all we can do is check that the
-                // new image is decodable.
-                warn!("Failed to read input image for validation: {}", old_err);
-                true
-            }
-            (Ok(new_png), Ok(old_png)) => images_equal(&old_png, &new_png),
-        }
-    }
-
-    /// Loads a PNG image from memory to a [DynamicImage]
-    fn load_png_image_from_memory(png_data: &[u8]) -> Result<DynamicImage, image::ImageError> {
-        let mut reader = image::io::Reader::new(Cursor::new(png_data));
-        reader.set_format(ImageFormat::Png);
-        reader.no_limits();
-        reader.decode()
-    }
-
-    /// Compares images pixel by pixel for equivalent content
-    fn images_equal(old_png: &DynamicImage, new_png: &DynamicImage) -> bool {
-        let a = old_png.pixels().filter(|x| {
-            let p = x.2.channels();
-            !(p.len() == 4 && p[3] == 0)
-        });
-        let b = new_png.pixels().filter(|x| {
-            let p = x.2.channels();
-            !(p.len() == 4 && p[3] == 0)
-        });
-        a.eq(b)
-    }
-}

src/sanity_checks.rs

@@ -0,0 +1,47 @@
+use image::{DynamicImage, GenericImageView, ImageFormat, Pixel};
+use log::{error, warn};
+use std::io::Cursor;
+
+/// Validate that the output png data still matches the original image
+pub fn validate_output(output: &[u8], original_data: &[u8]) -> bool {
+    let (old_png, new_png) = rayon::join(
+        || load_png_image_from_memory(original_data),
+        || load_png_image_from_memory(output),
+    );
+
+    match (new_png, old_png) {
+        (Err(new_err), _) => {
+            error!("Failed to read output image for validation: {}", new_err);
+            false
+        }
+        (_, Err(old_err)) => {
+            // The original image might be invalid if, for example, there is a CRC error,
+            // and we set fix_errors to true. In that case, all we can do is check that the
+            // new image is decodable.
+            warn!("Failed to read input image for validation: {}", old_err);
+            true
+        }
+        (Ok(new_png), Ok(old_png)) => images_equal(&old_png, &new_png),
+    }
+}
+
+/// Loads a PNG image from memory to a [DynamicImage]
+fn load_png_image_from_memory(png_data: &[u8]) -> Result<DynamicImage, image::ImageError> {
+    let mut reader = image::io::Reader::new(Cursor::new(png_data));
+    reader.set_format(ImageFormat::Png);
+    reader.no_limits();
+    reader.decode()
+}
+
+/// Compares images pixel by pixel for equivalent content
+fn images_equal(old_png: &DynamicImage, new_png: &DynamicImage) -> bool {
+    let a = old_png.pixels().filter(|x| {
+        let p = x.2.channels();
+        !(p.len() == 4 && p[3] == 0)
+    });
+    let b = new_png.pixels().filter(|x| {
+        let p = x.2.channels();
+        !(p.len() == 4 && p[3] == 0)
+    });
+    a.eq(b)
+}