diff --git a/cz/src/common.rs b/cz/src/common.rs
index 6b00e1d..aa5eb5d 100644
--- a/cz/src/common.rs
+++ b/cz/src/common.rs
@@ -341,7 +341,8 @@ pub fn rgba_to_indexed(input: &[u8], palette: &[[u8; 4]]) -> Result<Vec<u8>, CzE
     let mut output_map = Vec::new();
 
     for rgba in input.windows(4).step_by(4) {
-        dbg!(rgba);
+        let index = palette.iter().position(|e| e == rgba).unwrap_or_default();
+        output_map.push(index as u8);
     }
 
     Ok(output_map)
diff --git a/cz/src/compression.rs b/cz/src/compression.rs
index fb8fb82..2f2abde 100644
--- a/cz/src/compression.rs
+++ b/cz/src/compression.rs
@@ -1,7 +1,6 @@
-use byteorder::{LittleEndian, ReadBytesExt};
-use image::RgbaImage;
+use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
 use std::{
-    collections::BTreeMap,
+    collections::{BTreeMap, HashMap},
     io::{Read, Seek, Write},
 };
 
@@ -37,6 +36,34 @@ pub struct CompressionInfo {
     pub length: usize,
 }
 
+impl Default for CompressionInfo {
+    fn default() -> Self {
+        Self {
+            chunk_count: 0,
+            total_size_compressed: 0,
+            total_size_raw: 0,
+            chunks: Vec::new(),
+            length: 0
+        }
+    }
+}
+
+impl CompressionInfo {
+    pub fn write_into<T: WriteBytesExt + Write>(
+        &self,
+        output: &mut T,
+    ) -> Result<(), std::io::Error> {
+        output.write_u32::<LittleEndian>(self.chunk_count as u32)?;
+
+        for chunk in &self.chunks {
+            output.write_u32::<LittleEndian>(chunk.size_compressed as u32)?;
+            output.write_u32::<LittleEndian>(chunk.size_raw as u32)?;
+        }
+
+        Ok(())
+    }
+}
+
 /// Get info about the compression chunks
 ///
 /// These are defined by a length value, followed by the number of data chunks
@@ -123,7 +150,7 @@ pub fn decompress_2<T: Seek + ReadBytesExt + Read>(
 pub fn decompress_lzw2(input_data: &[u8], size: usize) -> Vec<u8> {
     let mut data = input_data.to_vec();
     data[0..2].copy_from_slice(&[0, 0]);
-    let mut dictionary = BTreeMap::new();
+    let mut dictionary = HashMap::new();
     for i in 0..256 {
         dictionary.insert(i as u64, vec![i as u8]);
     }
@@ -174,7 +201,12 @@ fn get_offset(input: &[u8], src: usize) -> usize {
     (((input[src] as usize) | (input[src + 1] as usize) << 8) - 0x101) * 2
 }
 
-fn copy_range(bitmap: &mut Vec<u8>, input: &[u8], src: usize, dst: usize) -> usize {
+fn copy_range(
+    bitmap: &mut Vec<u8>,
+    input: &[u8],
+    src: usize,
+    dst: usize
+) -> usize {
     let mut dst = dst;
     let start_pos = dst;
 
@@ -257,45 +289,101 @@ pub fn line_diff<T: CzHeader>(header: &T, data: &[u8]) -> Vec<u8> {
     output_buf
 }
 
-pub fn line_diff_cz4(picture: &mut RgbaImage, pixel_byte_count: usize, data: &[u8]) {
-    let width = picture.width();
-    let height = picture.height();
-    let block_height = (f32::ceil(height as f32 / 3.0) as u16) as u32;
 
-    let mut curr_line;
-    let mut prev_line = vec![0u8; width as usize * pixel_byte_count];
-
-    let mut i = 0;
-    for y in 0..height {
-        curr_line = data[i..i + width as usize * pixel_byte_count].to_vec();
-
-        if y % block_height != 0 {
-            for x in 0..(width as usize * pixel_byte_count) {
-                curr_line[x] = u8::wrapping_add(curr_line[x], prev_line[x])
-            }
-        }
-
-        for x in 0..width as usize {
-            if pixel_byte_count == 1 {
-                picture.get_pixel_mut(x as u32, y).0[3] = curr_line[x];
-            } else if pixel_byte_count == 4 {
-                picture.get_pixel_mut(x as u32, y).0 = [
-                    curr_line[x * pixel_byte_count],
-                    curr_line[x * pixel_byte_count + 1],
-                    curr_line[x * pixel_byte_count + 2],
-                    curr_line[x * pixel_byte_count + 3],
-                ];
-            } else if pixel_byte_count == 3 {
-                picture.get_pixel_mut(x as u32, y).0 = [
-                    curr_line[x * pixel_byte_count],
-                    curr_line[x * pixel_byte_count + 1],
-                    curr_line[x * pixel_byte_count + 2],
-                    0xFF,
-                ];
-            }
-        }
-
-        prev_line.clone_from(&curr_line);
-        i += width as usize * pixel_byte_count;
+pub fn compress(
+    data: &[u8],
+    size: usize,
+) -> (Vec<u8>, CompressionInfo) {
+    let mut size = size;
+    if size == 0 {
+        size = 0xFEFD
     }
+
+    let mut part_data;
+
+    let mut offset = 0;
+    let mut count = 0;
+    let mut last = String::new();
+
+    let mut output_buf: Vec<u8> = vec![];
+    let mut output_info = CompressionInfo {
+        total_size_raw: data.len(),
+        ..Default::default()
+    };
+
+    loop {
+        (count, part_data, last) = compress_lzw(&data[offset..], size, last);
+        if count == 0 {
+            break
+        }
+        offset += count;
+
+        for d in &part_data {
+            output_buf.write(&d.to_le_bytes()).unwrap();
+        }
+
+        output_info.chunks.push(ChunkInfo {
+            size_compressed: part_data.len(),
+            size_raw: count
+        });
+
+        output_info.chunk_count += 1;
+    }
+
+    output_info.total_size_compressed = output_buf.len() / 2;
+
+    (output_buf, output_info)
+}
+
+fn compress_lzw(data: &[u8], size: usize, last: String) -> (usize, Vec<u16>, String) {
+    let mut count = 0;
+    let mut dictionary = HashMap::new();
+    for i in 0..256 {
+        dictionary.insert(i.to_string(), i as u16);
+    }
+    let mut dictionary_count = (dictionary.len() + 1) as u16;
+
+
+    let mut element = String::new();
+    if last.len() != 0 {
+        element = last.clone()
+    }
+
+    let mut compressed = Vec::with_capacity(size);
+    for c in data {
+        let mut entry = element.clone();
+        entry.push_str(&c.to_string());
+
+        if dictionary.get(&entry).is_some() {
+            element = entry
+        } else {
+            compressed.push(*dictionary.get(&element).unwrap());
+            dictionary.insert(entry, dictionary_count);
+            element = c.to_string();
+            dictionary_count += 1;
+        }
+
+        count += 1;
+
+        if size > 0 && compressed.len() == size {
+            break
+        }
+    }
+
+    let last_element = element;
+    if compressed.len() == 0 {
+        if last_element.len() != 0 {
+            for c in last_element.bytes() {
+                compressed.push(*dictionary.get(&c.to_string()).unwrap());
+            }
+        }
+        return (count, compressed, String::new())
+    } else if compressed.len() < size {
+        if last_element.len() != 0 {
+            compressed.push(*dictionary.get(&last_element).unwrap());
+        }
+        return (count, compressed, String::new())
+    }
+
+    (count, compressed, last_element)
 }
diff --git a/cz/src/dynamic.rs b/cz/src/dynamic.rs
index 7b9454b..c210b43 100644
--- a/cz/src/dynamic.rs
+++ b/cz/src/dynamic.rs
@@ -99,14 +99,18 @@ impl DynamicCz {
         let output_bitmap;
         match &self.palette {
             Some(pal) if self.header_common.depth() <= 8 => {
-                output_bitmap = rgba_to_indexed(&self.bitmap(), &pal)?
+                output_bitmap = rgba_to_indexed(&self.bitmap(), &pal)?;
+
+                for rgba in pal {
+                    out_file.write_all(rgba)?;
+                }
             },
             _ => output_bitmap = self.bitmap().clone()
         }
 
         match self.header_common.version() {
-            CzVersion::CZ0 => cz0::encode(&mut out_file, &self.bitmap)?,
-            CzVersion::CZ1 => todo!(),
+            CzVersion::CZ0 => cz0::encode(&mut out_file, &output_bitmap)?,
+            CzVersion::CZ1 => cz1::encode(&mut out_file, &output_bitmap)?,
             CzVersion::CZ2 => todo!(),
             CzVersion::CZ3 => todo!(),
             CzVersion::CZ4 => todo!(),
diff --git a/cz/src/formats/cz1.rs b/cz/src/formats/cz1.rs
index 2265165..b52b44b 100644
--- a/cz/src/formats/cz1.rs
+++ b/cz/src/formats/cz1.rs
@@ -2,13 +2,15 @@ use byteorder::{ReadBytesExt, WriteBytesExt};
 use std::io::{Read, Seek, SeekFrom, Write};
 
 use crate::common::CzError;
-use crate::compression::{decompress, get_chunk_info};
+use crate::compression::{compress, decompress, get_chunk_info};
 
 pub fn decode<T: Seek + ReadBytesExt + Read>(bytes: &mut T) -> Result<Vec<u8>, CzError> {
     // Get the information about the compressed chunks
     let block_info = get_chunk_info(bytes)?;
     bytes.seek(SeekFrom::Start(block_info.length as u64))?;
 
+    dbg!(&block_info);
+
     // Get the bitmap
     let bitmap = decompress(bytes, &block_info).unwrap();
 
@@ -19,7 +21,13 @@ pub fn encode<T: WriteBytesExt + Write>(
     output: &mut T,
     bitmap: &[u8]
 ) -> Result<(), CzError> {
-    output.write_all(bitmap)?;
+    let (compressed_data, compressed_info) = compress(bitmap, 65277);
+
+    dbg!(&compressed_info);
+
+    compressed_info.write_into(output)?;
+
+    output.write_all(&compressed_data)?;
 
     Ok(())
 }
diff --git a/cz/src/formats/cz4.rs b/cz/src/formats/cz4.rs
index 7dff272..ab02f55 100644
--- a/cz/src/formats/cz4.rs
+++ b/cz/src/formats/cz4.rs
@@ -1,8 +1,9 @@
 use std::io::{Read, Seek, SeekFrom};
 use byteorder::ReadBytesExt;
+use image::RgbaImage;
 
 use crate::common::{CommonHeader, CzError, CzHeader};
-use crate::compression::{decompress, line_diff_cz4, get_chunk_info};
+use crate::compression::{decompress, get_chunk_info};
 
 pub fn decode<T: Seek + ReadBytesExt + Read>(bytes: &mut T, header: &CommonHeader) -> Result<Vec<u8>, CzError> {
     let block_info = get_chunk_info(bytes)?;
@@ -22,3 +23,49 @@ pub fn decode<T: Seek + ReadBytesExt + Read>(bytes: &mut T, header: &CommonHeade
 
     Ok(picture.into_raw())
 }
+
+pub fn line_diff_cz4(
+    picture: &mut RgbaImage,
+    pixel_byte_count: usize, data: &[u8]
+) {
+    let width = picture.width();
+    let height = picture.height();
+    let block_height = (f32::ceil(height as f32 / 3.0) as u16) as u32;
+
+    let mut curr_line;
+    let mut prev_line = vec![0u8; width as usize * pixel_byte_count];
+
+    let mut i = 0;
+    for y in 0..height {
+        curr_line = data[i..i + width as usize * pixel_byte_count].to_vec();
+
+        if y % block_height != 0 {
+            for x in 0..(width as usize * pixel_byte_count) {
+                curr_line[x] = u8::wrapping_add(curr_line[x], prev_line[x])
+            }
+        }
+
+        for x in 0..width as usize {
+            if pixel_byte_count == 1 {
+                picture.get_pixel_mut(x as u32, y).0[3] = curr_line[x];
+            } else if pixel_byte_count == 4 {
+                picture.get_pixel_mut(x as u32, y).0 = [
+                    curr_line[x * pixel_byte_count],
+                    curr_line[x * pixel_byte_count + 1],
+                    curr_line[x * pixel_byte_count + 2],
+                    curr_line[x * pixel_byte_count + 3],
+                ];
+            } else if pixel_byte_count == 3 {
+                picture.get_pixel_mut(x as u32, y).0 = [
+                    curr_line[x * pixel_byte_count],
+                    curr_line[x * pixel_byte_count + 1],
+                    curr_line[x * pixel_byte_count + 2],
+                    0xFF,
+                ];
+            }
+        }
+
+        prev_line.clone_from(&curr_line);
+        i += width as usize * pixel_byte_count;
+    }
+}
diff --git a/utils/src/main.rs b/utils/src/main.rs
index 3cbe0ee..59f5e94 100644
--- a/utils/src/main.rs
+++ b/utils/src/main.rs
@@ -1,35 +1,7 @@
-use std::{fs::DirBuilder, time::{Duration, Instant}};
-
 use cz::dynamic::DynamicCz;
-use walkdir::WalkDir;
 
 fn main() {
-    let _ = DirBuilder::new().create("test");
+    let img = DynamicCz::open("../../test_files/x5a3bvy.cz1").unwrap();
 
-    let mut total_time = Duration::default();
-    let mut num_images = 0;
-    for entry in WalkDir::new("../../test_files/") {
-        let entry = entry.unwrap();
-        if entry.path().is_dir() {
-            continue;
-        }
-
-        let timer = Instant::now();
-        let img = match DynamicCz::open(entry.path()) {
-            Ok(img) => img,
-            Err(err) => {
-                println!("{}: {:?}", entry.path().file_name().unwrap().to_string_lossy(), err);
-                continue;
-            },
-        };
-        let elapsed = timer.elapsed();
-        total_time += elapsed;
-        num_images += 1;
-
-        img.save_as_png(
-            &format!("test/{}.png", entry.path().file_name().unwrap().to_string_lossy())
-        ).unwrap();
-    }
-
-    dbg!(total_time / num_images);
+    img.save_as_cz("test.cz1").unwrap();
 }