diff --git a/androscalpel_serializer/src/constant.rs b/androscalpel_serializer/src/constant.rs
index ed322fd..ef36c2f 100644
--- a/androscalpel_serializer/src/constant.rs
+++ b/androscalpel_serializer/src/constant.rs
@@ -24,6 +24,8 @@ pub enum EndianConstant {
     EndianConstant,
     #[prefix(0x78563412)]
     ReverseEndianConstant,
+    #[default_variant]
+    Unknown(u32),
 }
 
 /// [no-index](https://source.android.com/docs/core/runtime/dex-format#no-index)
diff --git a/androscalpel_serializer/src/file_reader.rs b/androscalpel_serializer/src/file_reader.rs
new file mode 100644
index 0000000..fd11285
--- /dev/null
+++ b/androscalpel_serializer/src/file_reader.rs
@@ -0,0 +1,276 @@
+//! Parser for a .dex file.
+
+use crate::{
+    CallSiteIdItem, ClassDefItem, EndianConstant, Error, FieldIdItem, HeaderItem, MapItemType,
+    MapList, MethodHandleItem, MethodIdItem, ProtoIdItem, Result, Serializable, StringIdItem,
+    TypeIdItem,
+};
+use std::io::{Cursor, Seek, SeekFrom};
+
+pub struct DexFileReader<'a> {
+    data: &'a [u8],
+    header: HeaderItem,
+    string_ids: Vec<StringIdItem>,
+    type_ids: Vec<TypeIdItem>,
+    proto_ids: Vec<ProtoIdItem>,
+    field_ids: Vec<FieldIdItem>,
+    method_ids: Vec<MethodIdItem>,
+    class_defs: Vec<ClassDefItem>,
+    call_site_ids: Vec<CallSiteIdItem>,
+    method_handles: Vec<MethodHandleItem>,
+    map_list: MapList,
+}
+
+impl<'a> DexFileReader<'a> {
+    pub fn new(data: &'a [u8]) -> Result<Self> {
+        let mut buffer = Cursor::new(data);
+        let header = HeaderItem::deserialize(&mut buffer)?;
+        let mut tmp_file = Self {
+            data,
+            header,
+            // Default values before population
+            string_ids: vec![],
+            type_ids: vec![],
+            proto_ids: vec![],
+            field_ids: vec![],
+            method_ids: vec![],
+            class_defs: vec![],
+            call_site_ids: vec![],
+            method_handles: vec![],
+            map_list: MapList { list: vec![] },
+        };
+        tmp_file.map_list = tmp_file.get_struct_at_offset(tmp_file.header.map_off)?;
+        tmp_file.string_ids = tmp_file.get_item_list::<StringIdItem>(
+            tmp_file.header.string_ids_off,
+            tmp_file.header.string_ids_size,
+        )?;
+        tmp_file.type_ids = tmp_file.get_item_list::<TypeIdItem>(
+            tmp_file.header.type_ids_off,
+            tmp_file.header.type_ids_size,
+        )?;
+        tmp_file.proto_ids = tmp_file.get_item_list::<ProtoIdItem>(
+            tmp_file.header.proto_ids_off,
+            tmp_file.header.proto_ids_size,
+        )?;
+        tmp_file.field_ids = tmp_file.get_item_list::<FieldIdItem>(
+            tmp_file.header.field_ids_off,
+            tmp_file.header.field_ids_size,
+        )?;
+        tmp_file.method_ids = tmp_file.get_item_list::<MethodIdItem>(
+            tmp_file.header.method_ids_off,
+            tmp_file.header.method_ids_size,
+        )?;
+        tmp_file.class_defs = tmp_file.get_item_list::<ClassDefItem>(
+            tmp_file.header.class_defs_off,
+            tmp_file.header.class_defs_size,
+        )?;
+        if let Some(item) = tmp_file
+            .map_list
+            .list
+            .iter()
+            .find(|item| item.type_ == MapItemType::CallSiteIdItem)
+        {
+            tmp_file.call_site_ids =
+                tmp_file.get_item_list::<CallSiteIdItem>(item.offset, item.size)?
+        }
+        if let Some(item) = tmp_file
+            .map_list
+            .list
+            .iter()
+            .find(|item| item.type_ == MapItemType::CallSiteIdItem)
+        {
+            tmp_file.method_handles =
+                tmp_file.get_item_list::<MethodHandleItem>(item.offset, item.size)?
+        }
+        tmp_file.sanity_check()?;
+        Ok(tmp_file)
+    }
+
+    /// Return the file [`HeaderItem`].
+    pub fn get_header(&self) -> &HeaderItem {
+        &self.header
+    }
+
+    fn sanity_check(&self) -> Result<()> {
+        if self.header.magic.version != [0x30, 0x33, 0x39] {
+            println!(
+                "DEX 039 is the only verion currently supported, found {}",
+                std::str::from_utf8(self.header.magic.version.as_slice())
+                    .unwrap_or(&format!("{:x?}", self.header.magic.version))
+            ); // TODO: use proper logging
+        }
+        // TODO: check checksum
+        // TODO: check signature
+        if self.header.file_size as usize != self.data.len() {
+            println!(
+                "Unexpected file size found: {}, expected {}",
+                self.header.file_size,
+                self.data.len()
+            ); // TODO: use proper logging
+        }
+        if self.header.header_size != 0x70 {
+            println!(
+                "Unexpected header size found: 0x{:x}",
+                self.header.header_size
+            ); // TODO: use proper logging
+        }
+        if self.header.endian_tag != EndianConstant::EndianConstant {
+            println!("Wrong endian_tag found: {:x?}", self.header.endian_tag); // TODO: use proper logging
+        }
+        if self.header.link_off != 0 || self.header.link_size != 0 {
+            println!("Found non empty link section"); // TODO: use proper logging
+        }
+        for item in &self.map_list.list {
+            match item.type_ {
+                MapItemType::HeaderItem if item.offset != 0 || item.size != 1 => {
+                    return Err(Error::InconsistantStruct(format!(
+                        "Inconsistant Header Mapping info found in map_list: {item:x?}"
+                    )))
+                }
+                MapItemType::StringIdItem
+                    if item.offset != self.header.string_ids_off
+                        || item.size != self.header.string_ids_size =>
+                {
+                    return Err(Error::InconsistantStruct(format!(
+                        "Inconsistant MapList Mapping info found in map_list: {item:x?}, \
+                        header.string_ids_off: 0x{:x}, header.string_ids_size: {}",
+                        self.header.string_ids_off, self.header.string_ids_size
+                    )))
+                }
+                MapItemType::TypeIdItem
+                    if item.offset != self.header.type_ids_off
+                        || item.size != self.header.type_ids_size =>
+                {
+                    return Err(Error::InconsistantStruct(format!(
+                        "Inconsistant MapList Mapping info found in map_list: {item:x?}, \
+                        header.type_ids_off: 0x{:x}, header.type_ids_size: {}",
+                        self.header.type_ids_off, self.header.type_ids_size
+                    )))
+                }
+                MapItemType::ProtoIdItem
+                    if item.offset != self.header.proto_ids_off
+                        || item.size != self.header.proto_ids_size =>
+                {
+                    return Err(Error::InconsistantStruct(format!(
+                        "Inconsistant MapList Mapping info found in map_list: {item:x?}, \
+                        header.proto_ids_off: 0x{:x}, header.proto_ids_size: {}",
+                        self.header.proto_ids_off, self.header.proto_ids_size
+                    )))
+                }
+                MapItemType::FieldIdItem
+                    if item.offset != self.header.field_ids_off
+                        || item.size != self.header.field_ids_size =>
+                {
+                    return Err(Error::InconsistantStruct(format!(
+                        "Inconsistant MapList Mapping info found in map_list: {item:x?}, \
+                        header.field_ids_off: 0x{:x}, header.field_ids_size: {}",
+                        self.header.field_ids_off, self.header.field_ids_size
+                    )))
+                }
+                MapItemType::MethodIdItem
+                    if item.offset != self.header.method_ids_off
+                        || item.size != self.header.method_ids_size =>
+                {
+                    return Err(Error::InconsistantStruct(format!(
+                        "Inconsistant MapList Mapping info found in map_list: {item:x?}, \
+                        header.method_ids_off: 0x{:x}, header.method_ids_size: {}",
+                        self.header.method_ids_off, self.header.method_ids_size
+                    )))
+                }
+                MapItemType::ClassDefItem
+                    if item.offset != self.header.class_defs_off
+                        || item.size != self.header.class_defs_size =>
+                {
+                    return Err(Error::InconsistantStruct(format!(
+                        "Inconsistant MapList Mapping info found in map_list: {item:x?}, \
+                        header.class_defs_off: 0x{:x}, header.class_defs_size: {}",
+                        self.header.class_defs_off, self.header.class_defs_size
+                    )))
+                }
+                MapItemType::CallSiteIdItem => todo!(),
+                MapItemType::MethodHandleItem => todo!(),
+                MapItemType::MapList if item.offset != self.header.map_off || item.size != 0 => {
+                    return Err(Error::InconsistantStruct(format!(
+                        "Inconsistant MapList Mapping info found in map_list: {item:x?}, \
+                        header.map_list_off: 0x{:x}",
+                        self.header.map_off
+                    )))
+                }
+                /*
+                MapItemType::TypeList => todo!(),
+                MapItemType::AnnotationSetRefList => todo!(),
+                MapItemType::AnnotationSetItem => todo!(),
+                MapItemType::ClassDataItem => todo!(),
+                MapItemType::CodeItem => todo!(),
+                MapItemType::StringDataItem => todo!(),
+                MapItemType::DebugInfoItem => todo!(),
+                MapItemType::AnnotationItem => todo!(),
+                MapItemType::EncodedArrayItem => todo!(),
+                MapItemType::AnnotationsDirectoryItem => todo!(),
+                MapItemType::HiddenapiClassDataItem => todo!(),
+                */
+                MapItemType::UnkownType(ty) => {
+                    println!("Unknown Type found in map_list: 0x{ty:04x}"); // TODO: use proper
+                                                                            // loggin
+                }
+                _ => (),
+            }
+            let mut occurences = std::collections::HashMap::new();
+            for ty in self.map_list.list.iter().map(|val| val.type_) {
+                *occurences.entry(ty).or_insert(0) += 1;
+            }
+            let mut duplicate = false;
+            for (ty, val) in occurences {
+                if val > 1 {
+                    println!("Found multiple {} occurence of {:?} in map_list", val, ty);
+                    // TODO: use proper loggin
+                    duplicate = true;
+                }
+            }
+            if duplicate {
+                return Err(Error::InconsistantStruct(
+                    "Found multiple occurence of the same item type in map_list".into(),
+                ));
+            }
+        }
+        Ok(())
+    }
+
+    fn get_item_list<T: Serializable>(&self, offset: u32, size: u32) -> Result<Vec<T>> {
+        let mut buffer = Cursor::new(self.data);
+        buffer.seek(SeekFrom::Start(offset as u64)).map_err(|err| {
+            Error::DeserializationError(format!("Failed to seek 0x{offset:x} position: {err}"))
+        })?;
+        let mut list = vec![];
+        for _ in 0..size {
+            let pos = buffer.stream_position().map_err(|err| {
+                Error::DeserializationError(format!("Failled to read buffer position: {err}"))
+            })?;
+            list.push(T::deserialize(&mut buffer).map_err(|err| {
+                Error::DeserializationError(format!(
+                    "Failed to deserialize {} at 0x{:x}: {err}",
+                    std::any::type_name::<T>(),
+                    pos
+                ))
+            })?);
+        }
+        Ok(list)
+    }
+
+    /// Return the structure `T` located at `offset` in the file.
+    ///
+    /// # Warning
+    ///
+    /// If the offset is invalid, UB.
+    pub fn get_struct_at_offset<T: Serializable>(&self, offset: u32) -> Result<T> {
+        let mut buffer = Cursor::new(self.data);
+        buffer.seek(SeekFrom::Start(offset as u64)).unwrap();
+        T::deserialize(&mut buffer).map_err(|err| {
+            Error::DeserializationError(format!(
+                "Failed to deserialize {} at 0x{:x}: {err}",
+                std::any::type_name::<T>(),
+                offset
+            ))
+        })
+    }
+}
diff --git a/androscalpel_serializer/src/items/map.rs b/androscalpel_serializer/src/items/map.rs
index ba71ac8..10ea0d6 100644
--- a/androscalpel_serializer/src/items/map.rs
+++ b/androscalpel_serializer/src/items/map.rs
@@ -22,7 +22,7 @@ pub struct MapItem {
 }
 
 /// The type of the items refered by a [`MapItem`]: <https://source.android.com/docs/core/runtime/dex-format#type-codes>
-#[derive(Serializable, Clone, Copy, PartialEq, Eq, Debug)]
+#[derive(Serializable, Clone, Copy, PartialEq, Eq, Debug, Hash)]
 #[prefix_type(u16)]
 pub enum MapItemType {
     #[prefix(0x0000)]
@@ -67,6 +67,8 @@ pub enum MapItemType {
     AnnotationsDirectoryItem,
     #[prefix(0xF000)]
     HiddenapiClassDataItem,
+    #[default_variant]
+    UnkownType(u16),
 }
 
 impl MapList {
diff --git a/androscalpel_serializer/src/lib.rs b/androscalpel_serializer/src/lib.rs
index 44a449e..5778f9f 100644
--- a/androscalpel_serializer/src/lib.rs
+++ b/androscalpel_serializer/src/lib.rs
@@ -3,6 +3,7 @@ pub mod array;
 pub mod constant;
 pub mod core;
 pub mod debug;
+pub mod file_reader;
 pub mod items;
 pub mod value;
 
@@ -15,3 +16,5 @@ pub use constant::*;
 pub use debug::*;
 pub use items::*;
 pub use value::*;
+
+pub use file_reader::*;