diff --git a/cz/src/common.rs b/cz/src/common.rs
index 540d130..23280dc 100644
--- a/cz/src/common.rs
+++ b/cz/src/common.rs
@@ -26,6 +26,14 @@ pub enum CzError {
     DecodeError,
 }
 
+pub enum CzVersion {
+    CZ0,
+    CZ1,
+    CZ2,
+    CZ3,
+    CZ4,
+}
+
 pub trait CzHeader {
     fn new<T: Seek + ReadBytesExt + Read>(bytes: &mut T) -> Result<Self, CzError>
     where
@@ -37,21 +45,34 @@ pub trait CzHeader {
     /// Turn the header into bytes equivalent to the original header from the file
     fn to_bytes(&self) -> Result<Vec<u8>, io::Error>;
 
-    /// The version of the [CzImage] file
+    /// The version of the image
     fn version(&self) -> u8;
 
+    /// Set the version of the image
+    fn set_version(&mut self);
+
     /// The length of the header in bytes
     fn length(&self) -> usize;
 
     /// The width of the image
     fn width(&self) -> u16;
 
+    /// Set the width of the image
+    fn set_width(&mut self);
+
     /// The height of the image
     fn height(&self) -> u16;
 
+    /// Set the height of the image
+    fn set_height(&mut self);
+
     /// The bit depth of the image (BPP)
     fn depth(&self) -> u16;
 
+    fn set_depth(&mut self) {
+        unimplemented!()
+    }
+
     /// An unknown value?
     fn color_block(&self) -> u8;
 }
@@ -157,6 +178,8 @@ pub trait CzImage {
     /// Get the header for metadata
     fn header(&self) -> &Self::Header;
 
+    fn header_mut(&mut self) -> &mut Self::Header;
+
     /// Set the header with its metadata
     fn set_header(&mut self, header: &Self::Header);
 
diff --git a/cz/src/dynamic.rs b/cz/src/dynamic.rs
index 42cd705..46c85de 100644
--- a/cz/src/dynamic.rs
+++ b/cz/src/dynamic.rs
@@ -1,8 +1,11 @@
-use std::{io::{Read, Seek}, path::{Path, PathBuf}};
+use std::{
+    io::{BufReader, Read, Seek},
+    path::Path
+};
 use byteorder::ReadBytesExt;
 
 use crate::{
-    common::{CommonHeader, CzError, CzHeader},
+    common::{CommonHeader, CzError, CzVersion, CzHeader},
     Cz0Image,
     Cz1Image,
     Cz2Image,
@@ -11,17 +14,15 @@ use crate::{
     CzImage
 };
 
-pub enum DynamicCz {
-    CZ0(Cz0Image),
-    CZ1(Cz1Image),
-    CZ2(Cz2Image),
-    CZ3(Cz3Image),
-    CZ4(Cz4Image),
+struct DynamicCz {
+    cz_type: CzVersion,
+    bitmap: Vec<u8>,
+    header_common: CommonHeader,
 }
 
 impl DynamicCz {
     pub fn open<P: ?Sized + AsRef<Path>>(path: &P) -> Result<Self, CzError> {
-        let mut img_file = std::fs::File::open(path)?;
+        let mut img_file = BufReader::new(std::fs::File::open(path)?);
 
         Self::decode(&mut img_file)
     }
@@ -84,6 +85,10 @@ impl CzImage for DynamicCz {
         }
     }
 
+    fn header_mut(&mut self) -> &mut Self::Header {
+        todo!()
+    }
+
     fn set_header(&mut self, header: &Self::Header) {
         todo!()
     }
diff --git a/cz/src/formats/cz1.rs b/cz/src/formats/cz1.rs
index 6364bb5..d41a3a0 100644
--- a/cz/src/formats/cz1.rs
+++ b/cz/src/formats/cz1.rs
@@ -11,9 +11,8 @@ use crate::compression::{decompress, parse_chunk_info};
 #[derive(Debug, Clone)]
 pub struct Cz1Image {
     header: CommonHeader,
-    raw_bitmap: Option<Vec<u8>>,
     bitmap: Vec<u8>,
-    palette: Vec<[u8; 4]>,
+    palette: Option<Vec<[u8; 4]>>,
 }
 
 impl CzImage for Cz1Image {
@@ -40,25 +39,21 @@ impl CzImage for Cz1Image {
             palette = Some(parse_colormap(bytes, 1 << header.depth())?);
         }
 
+        // Get the information about the compressed chunks
         let chunk_info = parse_chunk_info(bytes)?;
 
+        // Get the bitmap
         let mut bitmap = decompress(bytes, &chunk_info).unwrap();
-        let mut raw_bitmap = None;
 
         // Apply the palette if it exists
         if let Some(pal) = &palette {
-            if let Some(raw) = &mut raw_bitmap {
-                bitmap.clone_into(raw);
-            }
-
             bitmap = apply_palette(&mut bitmap.as_slice(), pal);
         }
 
         let image = Self {
             header,
             bitmap,
-            raw_bitmap,
-            palette: palette.unwrap(),
+            palette,
         };
 
         Ok(image)
@@ -68,6 +63,10 @@ impl CzImage for Cz1Image {
         &self.header
     }
 
+    fn header_mut(&mut self) -> &mut Self::Header {
+        &mut self.header
+    }
+
     fn set_header(&mut self, header:& Self::Header) {
         self.header = *header
     }
diff --git a/cz/src/formats/cz4.rs b/cz/src/formats/cz4.rs
index 9d9b72e..56d46ee 100644
--- a/cz/src/formats/cz4.rs
+++ b/cz/src/formats/cz4.rs
@@ -98,6 +98,10 @@ impl CzImage for Cz4Image {
         &self.header
     }
 
+    fn header_mut(&mut self) -> &mut Self::Header {
+        &mut self.header
+    }
+
     fn set_header(&mut self, header: &Self::Header) {
         self.header = *header
     }