Implement --no-strip-subchannel

src/main.rs

@@ -53,7 +53,6 @@ fn main() {
     process::exit(main_main());
 }
 
-
 fn main_main() -> i32 {
     let args: Vec<String> = env::args().collect();
     let prog_name = &args.first().expect("Can't retrieve program's name");
@@ -67,6 +66,8 @@ fn main_main() -> i32 {
                  "extract cue sheet from the NRG metadata");
     opts.optflag("r", "extract-raw",
                  "extract the raw audio tracks");
+    opts.optflag("S", "no-strip-subchannel",
+                 "don't strip the 96-bit subchannel if present");
     opts.optflag("h", "help",
                  "print this help message");
     opts.optflag("V", "version",
@@ -90,6 +91,8 @@ fn main_main() -> i32 {
         return 0;
     }
 
+    let strip_subchannel = !options.opt_present("no-strip-subchannel");
+
     // Get input NRG image name
     if options.free.len() != 1 {
         // We need exactly one input file!
@@ -143,8 +146,9 @@ fn main_main() -> i32 {
     // Extract raw audio data
     if action_raw {
         println!("\nExtracting raw audio data...");
-        if let Err(err) = raw_audio::extract_nrg_raw_audio(&mut fd, &img_path,
-                                                           &metadata) {
+        if let Err(err) =
+            raw_audio::extract_nrg_raw_audio(&mut fd, &img_path,
+                                             &metadata, strip_subchannel) {
             println!("Error extracting raw audio data: {}", err);
         }
         println!("OK!");

src/raw_audio.rs

@@ -42,7 +42,8 @@ const RAW96_SEC_SIZE: u16 = 2448;
 /// The output file's name is derived from `img_path`.
 pub fn extract_nrg_raw_audio(in_fd: &mut File,
                              img_path: &str,
-                             metadata: &NrgMetadata)
+                             metadata: &NrgMetadata,
+                             strip_subchannel: bool)
                              -> Result<(), NrgError> {
     // Seek to the first audio byte
     let first_audio_byte = metadata.first_audio_byte();
@@ -54,11 +55,15 @@ pub fn extract_nrg_raw_audio(in_fd: &mut File,
 
     // Copy the audio data
     let count = metadata.last_audio_byte() - first_audio_byte;
-    let bytes_read = match metadata.sector_size() {
-        RAW96_SEC_SIZE => try!(copy_raw96_audio(in_fd, &mut out_fd, count)),
-        0              => return Err(NrgError::AudioReadError),
-        _              => try!(copy_raw_audio(in_fd, &mut out_fd, count)),
-    };
+    if metadata.sector_size() == 0 {
+        return Err(NrgError::AudioReadError);
+    }
+    let bytes_read =
+        if strip_subchannel && metadata.sector_size() == RAW96_SEC_SIZE {
+            try!(copy_raw96_audio(in_fd, &mut out_fd, count))
+        } else {
+            try!(copy_raw_audio(in_fd, &mut out_fd, count))
+        };
 
     assert_eq!(count, bytes_read);
     Ok(())