From 35d5dc6b2de49e4363421765236bc9d506d6fb23 Mon Sep 17 00:00:00 2001
From: opencode <opencode@home.ms>
Date: Sun, 5 Jul 2026 14:50:40 +0000
Subject: [PATCH] fix(#12): human-readable libraw error messages

---
 src/main.rs | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 0610ca2..569793e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -55,6 +55,22 @@ 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",
+    }
+}
+
 /// Photo Editor - A Rust-based photo editor with RAW image processing capabilities using libraw
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
@@ -223,7 +239,7 @@ 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);
+        eprintln!("Error: Failed to open file: {}", libraw_error_string(ret));
         unsafe { libraw_close(lr) };
         return Err("Failed to open file".into());
     }
@@ -233,7 +249,7 @@ 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);
+        eprintln!("Error: Failed to unpack RAW data: {}", libraw_error_string(ret));
         unsafe { libraw_close(lr) };
         return Err("Failed to unpack RAW data".into());
     }
@@ -248,7 +264,7 @@ 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);
+        eprintln!("Error: Failed to process image: {}", libraw_error_string(ret));
         unsafe { libraw_close(lr) };
         return Err("Failed to process image".into());
     }
@@ -300,7 +316,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     };
 
     if ret != LIBRAW_SUCCESS {
-        eprintln!("Error: Failed to write output file. Error code: {}", ret);
+        eprintln!("Error: Failed to write output file: {}", libraw_error_string(ret));
         unsafe { libraw_close(lr) };
         return Err("Failed to write output file".into());
     }