Merge pull request 'fix(#16): remove panic = abort to enable backtraces' (#29) from fix/issue-16 into master

Cargo.toml

@@ -2,6 +2,7 @@
 name = "photo_editor"
 version = "0.1.0"
 edition = "2024"
+license = "MIT"
 
 [dependencies]
 libraw-sys = "0.1.1"
@@ -17,4 +18,3 @@ path = "src/main.rs"
 opt-level = "z"  # Optimize for size
 lto = true       # Enable link-time optimization
 codegen-units = 1
-panic = "abort"

src/main.rs

@@ -55,6 +55,44 @@ fn sanitize_path(
     }
 }
 
+/// Map libraw error codes to human-readable strings.
+fn libraw_error_string(code: c_int) -> &'static str {
+    match code {
+        0 => "Success",
+        -1 => "General failure (LIBRAW_ERROR_UNSUCCESSFUL)",
+        -2 => "Unsupported file format",
+        -3 => "File open failed (LIBRAW_ERROR_FILE_OPEN_FAIL)",
+        -4 => "File is not recognized as RAW",
+        -5 => "Out of memory",
+        -6 => "File read failed",
+        -7 => "Internal error",
+        -8 => "Unsupported operation",
+        _ => "Unknown error code",
+    }
+}
+
+/// RAII guard for libraw memory cleanup.
+/// Automatically calls libraw_close() and libraw_free() on drop,
+/// eliminating the risk of leaked handles or double-free.
+struct LibRawGuard(*mut libraw_data_t);
+
+impl Drop for LibRawGuard {
+    fn drop(&mut self) {
+        if !self.0.is_null() {
+            unsafe {
+                libraw_close(self.0);
+                libraw_free(self.0);
+            }
+        }
+    }
+}
+
+impl LibRawGuard {
+    fn ptr(&self) -> *mut libraw_data_t {
+        self.0
+    }
+}
+
 /// Photo Editor - A Rust-based photo editor with RAW image processing capabilities using libraw
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
@@ -210,12 +248,14 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     println!("\n[INFO] Attempting RAW image processing with libraw integration...");
 
-    // Initialize libraw
-    let lr = unsafe { libraw_init(LIBRAW_OPTIONS_NONE) };
-    if lr.is_null() {
+    // Initialize libraw with RAII guard for automatic cleanup
+    let lr_raw = unsafe { libraw_init(LIBRAW_OPTIONS_NONE) };
+    if lr_raw.is_null() {
         eprintln!("Error: Failed to initialize libraw");
         return Err("Failed to initialize libraw".into());
     }
+    let lr_guard = LibRawGuard(lr_raw);
+    let lr = lr_guard.ptr();
 
     // Open the RAW file
     let input_cstr = CString::new(input_path.to_string_lossy().as_bytes())
@@ -223,8 +263,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     let ret = unsafe { libraw_open_file(lr, input_cstr.as_ptr()) };
 
     if ret != LIBRAW_SUCCESS {
-        eprintln!("Error: Failed to open file. Error code: {}", ret);
-        unsafe { libraw_close(lr) };
+        eprintln!("Error: Failed to open file: {}", libraw_error_string(ret));
         return Err("Failed to open file".into());
     }
 
@@ -233,8 +272,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // Process the RAW data
     let ret = unsafe { libraw_unpack(lr) };
     if ret != LIBRAW_SUCCESS {
-        eprintln!("Error: Failed to unpack RAW data. Error code: {}", ret);
-        unsafe { libraw_close(lr) };
+        eprintln!("Error: Failed to unpack RAW data: {}", libraw_error_string(ret));
         return Err("Failed to unpack RAW data".into());
     }
 
@@ -248,8 +286,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     // Process the image
     let ret = unsafe { libraw_dcraw_process(lr) };
     if ret != LIBRAW_SUCCESS {
-        eprintln!("Error: Failed to process image. Error code: {}", ret);
-        unsafe { libraw_close(lr) };
+        eprintln!("Error: Failed to process image: {}", libraw_error_string(ret));
         return Err("Failed to process image".into());
     }
 
@@ -300,18 +337,12 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     };
 
     if ret != LIBRAW_SUCCESS {
-        eprintln!("Error: Failed to write output file. Error code: {}", ret);
-        unsafe { libraw_close(lr) };
+        eprintln!("Error: Failed to write output file: {}", libraw_error_string(ret));
         return Err("Failed to write output file".into());
     }
 
     println!("[INFO] Processed image written to disk");
 
-    // Clean up
-    unsafe {
-        libraw_close(lr);
-    }
-
     println!("\n[SUCCESS] Photo editing completed successfully with libraw integration!");
     println!(
         "[NOTICE] The edited image has been saved as: {}",
@@ -331,7 +362,9 @@ fn apply_image_parameters(lr: *mut libraw_data_t, args: &Args) {
 
         // Apply exposure adjustment
         if args.exposure != 0.0 && !lr.is_null() {
-            libraw_set_bright(lr, args.exposure);
+            // Convert EV stops to brightness multiplier: EV 1.0 → 2x, EV -1.0 → 0.5x
+            let multiplier = 2.0f32.powf(args.exposure);
+            libraw_set_bright(lr, multiplier);
         }
 
         // Apply contrast (map to brightness multiplier for tonal range)