2 files changed, 33 insertions, 5 deletions
diff --git a/src/qhyccd/QHYCCDCam.rs b/src/qhyccd/QHYCCDCam.rs
index 37deef9..8419bb7 100644
--- a/src/qhyccd/QHYCCDCam.rs
+++ b/src/qhyccd/QHYCCDCam.rs
@@ -106,6 +106,7 @@ extern "C" {
     pub fn InitQHYCCD(id: *mut os::raw::c_void) -> os::raw::c_int;
     pub fn IsQHYCCDControlAvailable(handle: *mut os::raw::c_void, control: os::raw::c_int) -> os::raw::c_int;
     pub fn SetQHYCCDParam(handle: *mut os::raw::c_void, control: os::raw::c_int, value: os::raw::c_double) -> os::raw::c_int;
+    pub fn GetQHYCCDParamMinMaxStep(handle: *mut os::raw::c_void, control: os::raw::c_int, min: *mut os::raw::c_double, max: *mut os::raw::c_double, step: *mut os::raw::c_double) -> os::raw::c_int;
     pub fn GetQHYCCDParam(handle: *mut os::raw::c_void, control: os::raw::c_int) -> os::raw::c_double;
     pub fn GetQHYCCDEffectiveArea(handle: *mut os::raw::c_void, startx: *mut os::raw::c_int, starty: *mut os::raw::c_int, sizex: *mut os::raw::c_int, sizey: *mut os::raw::c_int) -> os::raw::c_int;
     pub fn GetQHYCCDOverScanArea(handle: *mut os::raw::c_void, startx: *mut os::raw::c_int, starty: *mut os::raw::c_int, sizex: *mut os::raw::c_int, sizey: *mut os::raw::c_int) -> os::raw::c_int;
diff --git a/src/qhyccd/mod.rs b/src/qhyccd/mod.rs
index 0ce31e2..a7fb784 100644
--- a/src/qhyccd/mod.rs
+++ b/src/qhyccd/mod.rs
@@ -105,6 +105,26 @@ impl Camera {
         }
         }
     }
+    pub fn get_param_limits(&self, control: Control) -> Result<(f64, f64, f64)> {
+        unsafe {
+            if self.has_param(control) {
+                let mut min = 0f64;
+                let mut max = 0f64;
+                let mut step = 0f64;
+                match check(QHYCCDCam::GetQHYCCDParamMinMaxStep(self.handle, control as i32, &mut min, &mut max, &mut step)) {
+                    Ok(_) => {
+                        Ok((min, max, step))
+                    },
+                    Err(_) => {
+                        Err(CameraError::QHYError)
+                    }
+                }
+            } else {
+                Err(CameraError::InvalidControl)
+            }
+        }
+    }
+
     pub fn get_param(&self, control: Control) -> f64 {
         unsafe {
             QHYCCDCam::GetQHYCCDParam(self.handle, control as i32)
@@ -228,15 +248,22 @@ impl Camera {
         let ref mut w = BufWriter::new(file);
         let mut encoder = png::Encoder::new(w, castediw as u32, castedih as u32);
         encoder.set(png::ColorType::RGB).set(png::BitDepth::Sixteen);
-        let mut writer = encoder.write_header().unwrap();
-        writer.write_image_data(
+        // crazy theory, endianness might be wrong...
+        // so flip the bytes first
+        let mut dataslice: &mut [u8] = 
             unsafe {
-                std::slice::from_raw_parts(
+                std::slice::from_raw_parts_mut(
                     data,
                     bufsize as usize
                 )
-            }
-        ).unwrap();
+            };
+        for i in 0..(bufsize as usize / 2) {
+            let tmp = dataslice[i * 2];
+            dataslice[i * 2] = dataslice[i * 2 + 1];
+            dataslice[i * 2 + 1] = tmp;
+        }
+        let mut writer = encoder.write_header().unwrap();
+        writer.write_image_data(dataslice).unwrap();
         dealloc(data as *mut u8, data_layout);
         Ok(())
     }