diff --git a/crates/shen-nbt4/Cargo.toml b/crates/shen-nbt4/Cargo.toml
new file mode 100644
index 0000000..843eae6
--- /dev/null
+++ b/crates/shen-nbt4/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "shen-nbt4"
+version = "0.1.0"
+edition = "2021"
+
+[features]
+default = []
+internal_opt = []
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[profile.release]
+debug = true
\ No newline at end of file
diff --git a/crates/shen-nbt4/src/lib.rs b/crates/shen-nbt4/src/lib.rs
new file mode 100644
index 0000000..0f85f0b
--- /dev/null
+++ b/crates/shen-nbt4/src/lib.rs
@@ -0,0 +1,465 @@
+use std::borrow::Cow;
+#[cfg(feature = "internal_opt")]
+use std::intrinsics::unlikely;
+
+pub struct NbtData {
+    pub head: usize,
+    pub data: Vec<u8>,
+}
+
+impl NbtData {
+    pub fn new(data: Vec<u8>) -> Self { Self { head: 0, data } }
+    pub fn get_mut(&mut self) -> &mut [u8] {
+        let (_, data) = self.data.split_at_mut(self.head);
+        data
+    }
+    pub fn push_head(&mut self, length: usize) -> usize {
+        self.head += length;
+        self.head
+    }
+    pub fn read_byte(&mut self) -> i8 {
+        let value = self.data[self.head] as i8;
+        self.head += 1;
+        value
+    }
+    pub fn read_short(&mut self) -> i16 {
+        let value = i16::from_be_bytes([self.data[self.head], self.data[self.head + 1]]);
+        self.head += 2;
+        value
+    }
+    pub fn read_int(&mut self) -> i32 {
+        let value = i32::from_be_bytes([
+            self.data[self.head],
+            self.data[self.head + 1],
+            self.data[self.head + 2],
+            self.data[self.head + 3],
+        ]);
+        self.head += 4;
+        value
+    }
+    pub fn read_long(&mut self) -> i64 {
+        let value = i64::from_be_bytes([
+            self.data[self.head],
+            self.data[self.head + 1],
+            self.data[self.head + 2],
+            self.data[self.head + 3],
+            self.data[self.head + 4],
+            self.data[self.head + 5],
+            self.data[self.head + 6],
+            self.data[self.head + 7],
+        ]);
+        self.head += 8;
+        value
+    }
+    pub fn read_float(&mut self) -> f32 {
+        let value = f32::from_be_bytes([
+            self.data[self.head],
+            self.data[self.head + 1],
+            self.data[self.head + 2],
+            self.data[self.head + 3],
+        ]);
+        self.head += 4;
+        value
+    }
+    pub fn read_double(&mut self) -> f64 {
+        let value = f64::from_be_bytes([
+            self.data[self.head],
+            self.data[self.head + 1],
+            self.data[self.head + 2],
+            self.data[self.head + 3],
+            self.data[self.head + 4],
+            self.data[self.head + 5],
+            self.data[self.head + 6],
+            self.data[self.head + 7],
+        ]);
+        self.head += 8;
+        value
+    }
+    pub fn read_bytes(&mut self, length: usize) -> Vec<u8> {
+        let value = self.data[self.head..self.head + length].to_vec();
+        self.head += length;
+        value
+    }
+}
+
+pub mod raw_reading {
+    #[cfg(feature = "internal_opt")]
+    use std::intrinsics::unlikely;
+
+    /// 多少有点脱裤子放屁
+    #[inline(always)]
+    pub fn slice_as_byte_array(slice: &[u8]) -> Vec<i8> {
+        slice.to_vec().into_iter().map(|x| x as i8).collect()
+    }
+    /// unsafe 从这里开始
+    #[inline(always)]
+    pub fn slice_as_short_array(slice: &[u8]) -> Option<Vec<i16>> {
+        #[cfg(feature = "internal_opt")]
+        let length = if unlikely(slice.len() % 2 != 0) {
+            return None;
+        } else {
+            (slice.len() / 2) as usize
+        };
+        #[cfg(not(feature = "internal_opt"))]
+        let length = if slice.len() % 2 != 0 {
+            return None;
+        } else {
+            (slice.len() / 2) as usize
+        };
+        Some(unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut i16, length).to_vec() })
+    }
+    /// 开始 unsafe 了
+    /// unsafe rust, 小子!
+    #[inline(always)]
+    pub fn slice_as_int_array(slice: &[u8]) -> Option<Vec<i32>> {
+        #[cfg(feature = "internal_opt")]
+        let length = if unlikely(slice.len() % 4 != 0) {
+            return None;
+        } else {
+            (slice.len() / 4) as usize
+        };
+        #[cfg(not(feature = "internal_opt"))]
+        let length = if slice.len() % 4 != 0 {
+            return None;
+        } else {
+            (slice.len() / 4) as usize
+        };
+        Some(unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut i32, length).to_vec() })
+    }
+    /// 这边也是 unsafe 捏
+    #[inline(always)]
+    pub fn slice_as_long_array(slice: &[u8]) -> Option<Vec<i64>> {
+        let length = if slice.len() % 8 != 0 {
+            return None;
+        } else {
+            (slice.len() / 8) as usize
+        };
+        Some(unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut i64, length).to_vec() })
+    }
+    /// 这边也是 unsafe 捏
+    #[inline(always)]
+    pub fn slice_as_float_array(slice: &[u8]) -> Option<Vec<f32>> {
+        let length = if slice.len() % 4 != 0 {
+            return None;
+        } else {
+            (slice.len() / 4) as usize
+        };
+        Some(unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut f32, length).to_vec() })
+    }
+    /// 这边也是 unsafe 捏
+    #[inline(always)]
+    pub fn slice_as_double_array(slice: &[u8]) -> Option<Vec<f64>> {
+        let length = if slice.len() % 8 != 0 {
+            return None;
+        } else {
+            (slice.len() / 8) as usize
+        };
+        Some(unsafe { std::slice::from_raw_parts(slice.as_ptr() as *mut f64, length).to_vec() })
+    }
+}
+
+#[derive(Debug)]
+pub enum Value<'value> {
+    // 还有一个 End: 0
+    /// 1
+    Byte(i8),
+    /// 2
+    Short(i16),
+    /// 3
+    Int(i32),
+    /// 4
+    Long(i64),
+    /// 5
+    Float(f32),
+    /// 6
+    Double(f64),
+    /// 8
+    String(Cow<'value, str>),
+    /// 7
+    ByteArray(Vec<i8>),
+    /// 11
+    IntArray(Vec<i32>),
+    /// 12
+    LongArray(Vec<i64>),
+    /// 9
+    List(Vec<Value>),
+    /// 10
+    Compound(Vec<(String, Value<'value>)>),
+}
+
+impl<'value> Value<'value> {
+    #[inline(always)]
+    pub fn read_byte(data: &mut NbtData) -> Self { Self::Byte(data.read_byte()) }
+    #[inline(always)]
+    pub fn read_short(data: &mut NbtData) -> Self { Self::Short(data.read_short()) }
+    #[inline(always)]
+    pub fn read_int(data: &mut NbtData) -> Self { Self::Int(data.read_int()) }
+    #[inline(always)]
+    pub fn read_long(data: &mut NbtData) -> Self { Self::Long(data.read_long()) }
+    #[inline(always)]
+    pub fn read_float(data: &mut NbtData) -> Self { Self::Float(data.read_float()) }
+    #[inline(always)]
+    pub fn read_double(data: &mut NbtData) -> Self { Self::Double(data.read_double()) }
+    #[inline(always)]
+    pub fn read_string(data: &mut NbtData) -> Self {
+        let length = data.read_short();
+        let value = data.read_bytes(length as usize);
+        Self::String(std::str::from_utf8(value.as_slice()).unwrap().to_owned().into())
+    }
+    pub fn read_list(data: &mut NbtData) -> Self {
+        // 内容类型
+        let type_id = data.read_byte();
+        // 内容长度
+        let length = data.read_int();
+        match type_id {
+            0 => panic!("WTF, type_id = 0"),
+            1 => {
+                let raw_data = data.read_bytes(length as usize);
+                let list = raw_reading::slice_as_byte_array(raw_data.as_slice());
+                Self::List(list)
+            }
+            2 => {
+                let raw_data = data.read_bytes(length as usize * 2);
+                let list = raw_reading::slice_as_short_array(raw_data.as_slice()).unwrap();
+                Self::List(list)
+            }
+            3 => {
+                let raw_data = data.read_bytes(length as usize * 4);
+                let list = raw_reading::slice_as_int_array(raw_data.as_slice()).unwrap();
+                Self::List(list)
+            }
+            4 => {
+                let raw_data = data.read_bytes(length as usize * 8);
+                let list = raw_reading::slice_as_long_array(raw_data.as_slice()).unwrap();
+                Self::List(list)
+            }
+            5 => {
+                let raw_data = data.read_bytes(length as usize * 4);
+                let list = raw_reading::slice_as_float_array(raw_data.as_slice()).unwrap();
+                Self::List(list)
+            }
+            6 => {
+                let raw_data = data.read_bytes(length as usize * 8);
+                let list = raw_reading::slice_as_double_array(raw_data.as_slice()).unwrap();
+                Self::List(list)
+            }
+            7 => {
+                let mut list = Vec::with_capacity(length as usize);
+                for _ in 0..length {
+                    let length = data.read_int();
+                    let raw_data = data.read_bytes(length as usize);
+                    let value = raw_reading::slice_as_byte_array(raw_data.as_slice());
+                    list.push(value);
+                }
+                Self::List(list)
+            }
+            8 => {
+                let mut list = Vec::with_capacity(length as usize);
+                for _ in 0..length {
+                    let length = data.read_int();
+                    let value = std::str::from_utf8(data.read_bytes(length as usize).as_slice())
+                        .unwrap()
+                        .to_owned();
+                    list.push(value);
+                }
+                Self::List(list)
+            }
+            9 => {
+                // 好好好, list 嵌套 list 是吧
+                let mut list = Vec::with_capacity(length as usize);
+                for _ in 0..length {
+                    let inner_list = Self::read_list(data);
+                    let value = inner_list.into_list().unwrap();
+                    list.push(value);
+                }
+                Self::List(list)
+            }
+            10 => {
+                let mut list = Vec::with_capacity(length as usize);
+                for _ in 0..length {
+                    let inner_compound = Self::read_compound(data);
+                    let value = inner_compound.into_compound().unwrap();
+                    list.push(value);
+                }
+                Self::List(list)
+            }
+            11 => {
+                let mut list = Vec::with_capacity(length as usize);
+                for _ in 0..length {
+                    let length = data.read_int();
+                    let raw_data = data.read_bytes(length as usize * 4);
+                    let value = raw_reading::slice_as_int_array(raw_data.as_slice()).unwrap();
+                    list.push(value);
+                }
+                Self::List(list)
+            }
+            12 => {
+                let mut list = Vec::with_capacity(length as usize);
+                for _ in 0..length {
+                    let length = data.read_int();
+                    let raw_data = data.read_bytes(length as usize * 8);
+                    let value = raw_reading::slice_as_long_array(raw_data.as_slice()).unwrap();
+                    list.push(value);
+                }
+                Self::List(list)
+            }
+            _ => panic!("WTF, type_id = {}", type_id),
+        }
+    }
+    pub fn read_compound(data: &mut NbtData) -> Self {
+        let mut type_id = 1;
+        let mut list = Vec::with_capacity(10);
+        while type_id != 0 {
+            type_id = data.read_byte();
+            #[cfg(feature = "internal_opt")]
+            if unlikely(type_id == 0) {
+                break;
+            }
+            #[cfg(not(feature = "internal_opt"))]
+            if type_id == 0 {
+                break;
+            }
+            let name_len = data.read_short();
+            let name = if name_len != 0 {
+                let name = String::from_utf8(data.read_bytes(name_len as usize)).unwrap();
+                name
+            } else {
+                String::new()
+            };
+            let value = match type_id {
+                0 => break,
+                1 => Self::read_byte(data),
+                2 => Self::read_short(data),
+                3 => Self::read_int(data),
+                4 => Self::read_long(data),
+                5 => Self::read_float(data),
+                6 => Self::read_double(data),
+                7 => Self::read_byte_array(data),
+                8 => Self::read_string(data),
+                9 => Self::read_list(data),
+                10 => Self::read_compound(data),
+                11 => Self::read_int_array(data),
+                12 => Self::read_long_array(data),
+                _ => panic!("WTF, type_id = {}", type_id),
+            };
+            list.push((name, value));
+        }
+        Self::Compound(list)
+    }
+    #[inline(always)]
+    pub fn read_byte_array(data: &mut NbtData) -> Self {
+        let length = data.read_int();
+        let raw_data = data.read_bytes(length as usize);
+        let value = raw_reading::slice_as_byte_array(raw_data.as_slice());
+        Self::ByteArray(value)
+    }
+    #[inline(always)]
+    pub fn read_int_array(data: &mut NbtData) -> Self {
+        let length = data.read_int();
+        let raw_data = data.read_bytes(length as usize * 4);
+        let value = raw_reading::slice_as_int_array(raw_data.as_slice()).unwrap();
+        Self::IntArray(value)
+    }
+    #[inline(always)]
+    pub fn read_long_array(data: &mut NbtData) -> Self {
+        let length = data.read_int();
+        let raw_data = data.read_bytes(length as usize * 8);
+        let value = raw_reading::slice_as_long_array(raw_data.as_slice()).unwrap();
+        Self::LongArray(value)
+    }
+    pub fn as_byte(&self) -> Option<i8> {
+        match self {
+            Self::Byte(value) => Some(*value),
+            _ => None,
+        }
+    }
+    pub fn as_short(&self) -> Option<i16> {
+        match self {
+            Self::Short(value) => Some(*value),
+            _ => None,
+        }
+    }
+    pub fn as_int(&self) -> Option<i32> {
+        match self {
+            Self::Int(value) => Some(*value),
+            _ => None,
+        }
+    }
+    pub fn as_long(&self) -> Option<i64> {
+        match self {
+            Self::Long(value) => Some(*value),
+            _ => None,
+        }
+    }
+    pub fn as_float(&self) -> Option<f32> {
+        match self {
+            Self::Float(value) => Some(*value),
+            _ => None,
+        }
+    }
+    pub fn as_double(&self) -> Option<f64> {
+        match self {
+            Self::Double(value) => Some(*value),
+            _ => None,
+        }
+    }
+    pub fn as_string(&self) -> Option<&str> {
+        match self {
+            Self::String(value) => Some(value.as_ref()),
+            _ => None,
+        }
+    }
+    pub fn as_list(&self) -> Option<&ListContent> {
+        match self {
+            Self::List(value) => Some(value),
+            _ => None,
+        }
+    }
+    pub fn as_compound(&self) -> Option<&Vec<(String, Value<'value>)>> {
+        match self {
+            Self::Compound(value) => Some(value),
+            _ => None,
+        }
+    }
+    pub fn as_byte_array(&self) -> Option<&Vec<i8>> {
+        match self {
+            Self::ByteArray(value) => Some(value),
+            _ => None,
+        }
+    }
+    pub fn as_int_array(&self) -> Option<&Vec<i32>> {
+        match self {
+            Self::IntArray(value) => Some(value),
+            _ => None,
+        }
+    }
+    pub fn as_long_array(&self) -> Option<&Vec<i64>> {
+        match self {
+            Self::LongArray(value) => Some(value),
+            _ => None,
+        }
+    }
+    #[inline(always)]
+    pub fn into_list(self) -> Option<ListContent<'value>> {
+        match self {
+            Self::List(value) => Some(value),
+            _ => None,
+        }
+    }
+    #[inline(always)]
+    pub fn into_compound(self) -> Option<Vec<(String, Value<'value>)>> {
+        match self {
+            Self::Compound(value) => Some(value),
+            _ => None,
+        }
+    }
+    pub fn from_vec(data: Vec<u8>) -> Self {
+        let mut nbt_data = NbtData::new(data);
+        let _type_id = nbt_data.read_byte();
+        let _name_len = nbt_data.read_short();
+        println!("{} {}", _type_id, _name_len);
+        let name = String::from_utf8(nbt_data.read_bytes(_name_len as usize)).unwrap();
+        println!("{}", name);
+        Value::read_compound(&mut nbt_data)
+    }
+}
diff --git a/crates/shen-nbt4/src/rustfmt.toml b/crates/shen-nbt4/src/rustfmt.toml
new file mode 100644
index 0000000..550e299
--- /dev/null
+++ b/crates/shen-nbt4/src/rustfmt.toml
@@ -0,0 +1,23 @@
+# cargo fmt config
+
+# 最大行长
+max_width = 100
+# 链式调用的最大长度
+chain_width = 80
+# 数组的最大长度
+array_width = 80
+# 函数参数的最大长度
+attr_fn_like_width = 80
+# 函数调用参数的最大长度
+fn_call_width = 80
+# 简单函数格式化为单行
+fn_single_line = true
+
+# 自动对齐最大长度
+enum_discrim_align_threshold = 5
+# 字段初始化使用简写
+use_field_init_shorthand = true
+# 是否使用彩色输出
+color = "Always"
+
+edition = "2021"
diff --git a/test-data/NA.Nbt-cli.exe b/test-data/NA.Nbt-cli.exe
new file mode 100644
index 0000000..487fcae
Binary files /dev/null and b/test-data/NA.Nbt-cli.exe differ