1 files changed, 62 insertions, 33 deletions
diff --git a/src/block/screendescriptor.rs b/src/block/screendescriptor.rs
index d53d252..ff70896 100644
--- a/src/block/screendescriptor.rs
+++ b/src/block/screendescriptor.rs
@@ -1,40 +1,69 @@
+use std::convert::TryInto;
+
 pub struct ScreenDescriptor {
-	pub width: u16,
-	pub height: u16,
-	pub packed: u8,
-	pub background_color_index: u8,
-	pub pixel_aspect_ratio: u8
+    pub width: u16,
+    pub height: u16,
+    pub packed: u8,
+    pub background_color_index: u8,
+    pub pixel_aspect_ratio: u8,
 }
 
 impl ScreenDescriptor {
-	pub fn color_table_present(&mut self, is_present: bool) {
-		if is_present {
-			self.packed |= 0b1000_0000;
-		} else {
-			self.packed &= 0b0111_1111;
-		}
-	}
-
-	pub fn color_table_size(&mut self, size: u8) {
-		// GCT size is calulated by raising two to this number plus one,
-		// so we have to work backwards.
-		let size = (size as f32).log2().ceil() - 1f32;
-		self.packed |= size as u8;
-	}
-
-	//TODO: Setter for sort flag in packed field
-	//TODO: Setter for color resolution in packed field
+    pub fn set_color_table_present(&mut self, is_present: bool) {
+        if is_present {
+            self.packed |= 0b1000_0000;
+        } else {
+            self.packed &= 0b0111_1111;
+        }
+    }
+
+    pub fn set_color_table_size(&mut self, size: u8) {
+        println!("scts: {}", size);
+        // GCT size is calulated by raising two to this number plus one,
+        // so we have to work backwards.
+        let size = (size as f32).log2().ceil() - 1f32;
+        self.packed |= size as u8;
+    }
+
+    //TODO: Setter for sort flag in packed field
+    //TODO: Setter for color resolution in packed field
+
+    pub fn color_table_present(&self) -> bool {
+        self.packed & 0b1000_0000 != 0
+    }
+
+    pub fn color_table_len(&self) -> usize {
+        crate::packed_to_color_table_length(self.packed & 0b0000_0111)
+    }
 }
 
 impl From<&ScreenDescriptor> for Box<[u8]> {
-	fn from(lsd: &ScreenDescriptor) -> Self {
-		let mut vec = vec![];
-		vec.extend_from_slice(&lsd.width.to_le_bytes());
-		vec.extend_from_slice(&lsd.height.to_le_bytes());
-		vec.push(lsd.packed);
-		vec.push(lsd.background_color_index);
-		vec.push(lsd.pixel_aspect_ratio);
-
-		vec.into_boxed_slice()
-	}
-}
\ No newline at end of file
+    fn from(lsd: &ScreenDescriptor) -> Self {
+        let mut vec = vec![];
+        vec.extend_from_slice(&lsd.width.to_le_bytes());
+        vec.extend_from_slice(&lsd.height.to_le_bytes());
+        vec.push(lsd.packed);
+        vec.push(lsd.background_color_index);
+        vec.push(lsd.pixel_aspect_ratio);
+
+        vec.into_boxed_slice()
+    }
+}
+
+impl From<[u8; 7]> for ScreenDescriptor {
+    fn from(arr: [u8; 7]) -> Self {
+        let width = u16::from_le_bytes(arr[0..2].try_into().unwrap());
+        let height = u16::from_le_bytes(arr[2..4].try_into().unwrap());
+        let packed = arr[4];
+        let background_color_index = arr[5];
+        let pixel_aspect_ratio = arr[6];
+
+        Self {
+            width,
+            height,
+            packed,
+            background_color_index,
+            pixel_aspect_ratio,
+        }
+    }
+}