api: Added the extensions API call

Signed-off-by: Hubert Figuière <hub@figuiere.net>

3 files changed, 51 insertions, 3 deletions

diff --git a/examples/extensions.rs b/examples/extensions.rs
new file mode 100644
index 0000000..3d0c829
--- /dev/null
+++ b/examples/extensions.rs
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: LGPL-3.0-or-later
+/*
+ * libopenraw - examples/extensions.rs
+ *
+ * Copyright (C) 2024 Hubert Figuière
+ *
+ * This library is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+fn main() {
+    let exts = libopenraw::extensions();
+    println!("Extensions supported");
+    for ext in exts {
+        println!("{ext}");
+    }
+}
diff --git a/src/capi.rs b/src/capi.rs
index 4901470..bedcf6e 100644
--- a/src/capi.rs
+++ b/src/capi.rs
@@ -366,9 +366,9 @@ unsafe extern "C" fn or_get_extract_rawdata(
 /// The storage for the static strings. The CString array
 /// is just used to keep the pointers valid.
 static STATIC_EXTS: Lazy<Vec<CString>> = Lazy::new(|| {
-    crate::identify::EXT_TO_TYPE
-        .keys()
-        .map(|e| CString::new(*e).expect("static C string failed"))
+    crate::extensions()
+        .iter()
+        .map(|e| CString::new(e.as_bytes()).expect("static C string failed"))
         .collect()
 });
 
diff --git a/src/lib.rs b/src/lib.rs
index 6065517..a33eab5 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -23,6 +23,8 @@
 #[macro_use]
 extern crate log;
 
+use once_cell::sync::Lazy;
+
 #[macro_use]
 mod dump;
 #[macro_use]
@@ -320,6 +322,24 @@ impl From<TypeId> for u32 {
     }
 }
 
+static EXTENSIONS: Lazy<Vec<String>> = Lazy::new(|| {
+    crate::identify::EXT_TO_TYPE
+        .iter()
+        .filter_map(|(e, t)| {
+            if *t != Type::Jpeg {
+                Some(String::from(*e))
+            } else {
+                None
+            }
+        })
+        .collect()
+});
+
+/// Return the extensions for raw files (in lowercase).
+pub fn extensions() -> &'static [String] {
+    &EXTENSIONS
+}
+
 #[cfg(test)]
 mod test {
     use super::TypeId;