Add support for reading float arrays

benches/main.rs

@@ -1,5 +1,5 @@
 use criterion::{Criterion, criterion_group, criterion_main};
-use eccodes::FallibleIterator;
+use eccodes::{FallibleIterator, KeyRead};
 use eccodes::codes_file::{CodesFile, ProductKind};
 use std::hint::black_box;
 use std::path::Path;
@@ -28,6 +28,14 @@ pub fn key_reading(c: &mut Criterion) {
         b.iter(|| msg.read_key_dynamic(black_box("values")).unwrap())
     });
 
+    c.bench_function("static double array reading", |b| {
+        b.iter(|| -> Vec<f64> { msg.read_key(black_box("values")).unwrap() })
+    });
+
+    c.bench_function("static float array reading", |b| {
+        b.iter(|| -> Vec<f32> { msg.read_key(black_box("values")).unwrap() })
+    });
+
     c.bench_function("string reading", |b| {
         b.iter(|| msg.read_key_dynamic(black_box("name")).unwrap())
     });

src/codes_message/read.rs

@@ -4,8 +4,9 @@ use crate::{
     codes_message::CodesMessage,
     errors::CodesError,
     intermediate_bindings::{
-        NativeKeyType, codes_get_bytes, codes_get_double, codes_get_double_array, codes_get_long,
-        codes_get_long_array, codes_get_native_type, codes_get_size, codes_get_string,
+        NativeKeyType, codes_get_bytes, codes_get_double, codes_get_double_array,
+        codes_get_float_array, codes_get_long, codes_get_long_array, codes_get_native_type,
+        codes_get_size, codes_get_string,
     },
 };
 
@@ -113,6 +114,13 @@ macro_rules! key_size_check {
 
 impl_key_read!(scalar, codes_get_long, NativeKeyType::Long, i64);
 impl_key_read!(scalar, codes_get_double, NativeKeyType::Double, f64);
+// Double-typed ecCodes arrays can be decoded directly into f32.
+impl_key_read!(
+    array,
+    codes_get_float_array,
+    NativeKeyType::Double,
+    Vec<f32>
+);
 impl_key_read!(array, codes_get_string, NativeKeyType::Str, String);
 impl_key_read!(array, codes_get_bytes, NativeKeyType::Bytes, Vec<u8>);
 impl_key_read!(array, codes_get_long_array, NativeKeyType::Long, Vec<i64>);

src/intermediate_bindings/codes_get.rs

@@ -95,6 +95,30 @@ pub unsafe fn codes_get_double_array(
     }
 }
 
+pub unsafe fn codes_get_float_array(
+    handle: *const codes_handle,
+    key: &str,
+) -> Result<Vec<f32>, CodesError> {
+    unsafe {
+        pointer_guard::non_null!(handle);
+
+        let mut key_size = codes_get_size(handle, key)?;
+        let key = CString::new(key).unwrap();
+
+        let mut key_values: Vec<f32> = vec![0.0; key_size];
+
+        let error_code = eccodes_sys::codes_get_float_array(
+            handle,
+            key.as_ptr(),
+            key_values.as_mut_ptr().cast(),
+            &raw mut key_size,
+        );
+        error_code_to_result(error_code)?;
+
+        Ok(key_values)
+    }
+}
+
 pub unsafe fn codes_get_long_array(
     handle: *const codes_handle,
     key: &str,

src/intermediate_bindings/mod.rs

@@ -26,8 +26,8 @@ pub enum NativeKeyType {
 }
 
 pub use codes_get::{
-    codes_get_bytes, codes_get_double, codes_get_double_array, codes_get_long,
-    codes_get_long_array, codes_get_message, codes_get_native_type, codes_get_size,
+    codes_get_bytes, codes_get_double, codes_get_double_array, codes_get_float_array,
+    codes_get_long, codes_get_long_array, codes_get_message, codes_get_native_type, codes_get_size,
     codes_get_string,
 };
 pub use codes_handle::{codes_handle_clone, codes_handle_delete, codes_handle_new_from_file};