diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..82f9275
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,162 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/latest/usage/project/#working-with-version-control
+.pdm.toml
+.pdm-python
+.pdm-build/
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
diff --git a/igelfs/__init__.py b/igelfs/__init__.py
new file mode 100644
index 0000000..fbd9080
--- /dev/null
+++ b/igelfs/__init__.py
@@ -0,0 +1,36 @@
+"""
+Python interface for the IGEL filesystem.
+
+For a standard IGEL OS disk image, the layout is similar to the below:
+- Partition 1
+  - IGEL FS
+- Partition 2
+  - FAT32, ESP #1
+- Partition 3
+  - FAT32, ESP #2
+
+IGEL FS has the following layout:
+- Section #0
+  - Boot Registry
+    - Boot Registry Entries
+  - Directory
+    - Partition Descriptors
+    - Fragment Descriptors
+- Section #1...
+  - Section Header
+  - Partition
+    - Partition Header
+    - Partition Payload
+"""
+
+from igelfs.filesystem import Filesystem, Section
+from igelfs.models import BootRegistryHeader, Directory, PartitionHeader, SectionHeader
+
+__all__ = [
+    "BootRegistryHeader",
+    "Directory",
+    "Filesystem",
+    "PartitionHeader",
+    "Section",
+    "SectionHeader",
+]
diff --git a/igelfs/base.py b/igelfs/base.py
new file mode 100644
index 0000000..42d2cc3
--- /dev/null
+++ b/igelfs/base.py
@@ -0,0 +1,98 @@
+"""Abstract base classes for various data models."""
+
+import io
+from abc import ABC
+from dataclasses import dataclass, fields
+from typing import ClassVar, get_args, get_origin
+
+
+@dataclass
+class BaseDataModel(ABC):
+    """Abstract base class for data model."""
+
+    MODEL_ATTRIBUTE_SIZES: ClassVar[dict[str, int]]
+
+    def __len__(self) -> int:
+        """Implement __len__ data model method."""
+        return self.size
+
+    def to_bytes(self) -> bytes:
+        """Return bytes of all data."""
+        with io.BytesIO() as fd:
+            for attribute, size in self.MODEL_ATTRIBUTE_SIZES.items():
+                data = getattr(self, attribute)
+                match data:
+                    case bytes():
+                        fd.write(data)
+                    case int():
+                        fd.write(data.to_bytes(size))
+                    case str():
+                        fd.write(data.encode())
+                    case BaseDataModel() | DataModelCollection():
+                        fd.write(data.to_bytes())
+            fd.seek(0)
+            return fd.read()
+
+    @property
+    def size(self) -> int:
+        """Return actual size of all data."""
+        return len(self.to_bytes())
+
+    @classmethod
+    def get_model_size(cls) -> int:
+        """Return expected total size of data for model."""
+        return sum(cls.MODEL_ATTRIBUTE_SIZES.values())
+
+    def verify(self) -> bool:
+        """Verify data model integrity."""
+        return self.size == self.get_model_size()
+
+    @classmethod
+    def from_bytes_to_dict(cls, data: bytes) -> dict[str, bytes]:
+        """Return dictionary from bytes."""
+        model = {}
+        with io.BytesIO(data) as fd:
+            for attribute, size in cls.MODEL_ATTRIBUTE_SIZES.items():
+                model[attribute] = fd.read(size)
+        return model
+
+    @classmethod
+    def from_bytes(cls, data: bytes) -> "BaseDataModel":
+        """Return data model instance from bytes."""
+        model = cls.from_bytes_to_dict(data)
+        for field in fields(cls):
+            if get_origin(field.type) == DataModelCollection:
+                inner = get_args(field.type)[0]
+                model[field.name] = DataModelCollection(
+                    inner.from_bytes(chunk)
+                    for chunk in [
+                        model[field.name][i : i + inner.get_model_size()]
+                        for i in range(
+                            0, len(model[field.name]), inner.get_model_size()
+                        )
+                    ]
+                )
+            elif field.type == str:
+                model[field.name] = model[field.name].decode()
+            elif field.type == int:
+                model[field.name] = int.from_bytes(model[field.name])
+            else:
+                model[field.name] = field.type(model[field.name])
+        return cls(**model)
+
+
+class DataModelCollection(list):
+    """List subclass to provide additional helper methods."""
+
+    def to_bytes(self) -> bytes:
+        """Return bytes of all models."""
+        with io.BytesIO() as fd:
+            for model in self:
+                fd.write(model.to_bytes())
+            fd.seek(0)
+            return fd.read()
+
+    @property
+    def size(self) -> int:
+        """Return actual size of all data."""
+        return len(self.to_bytes())
diff --git a/igelfs/constants.py b/igelfs/constants.py
new file mode 100644
index 0000000..dece065
--- /dev/null
+++ b/igelfs/constants.py
@@ -0,0 +1,108 @@
+"""Python implementation of igelsdk.h sourced from igel-flash-driver."""
+
+import math
+from enum import IntEnum, IntFlag
+
+
+class SectionSize(IntEnum):
+    """Enumeration for section sizes."""
+
+    SECT_SIZE_64K = 0
+    SECT_SIZE_128K = 1
+    SECT_SIZE_256K = 2
+    SECT_SIZE_512K = 3
+    SECT_SIZE_1M = 4
+    SECT_SIZE_2M = 5
+    SECT_SIZE_4M = 6
+    SECT_SIZE_8M = 7
+    SECT_SIZE_16M = 8
+
+    @classmethod
+    def get(cls, size: int) -> "SectionSize":
+        """Get SectionSize for specified size."""
+        section_size = int(math.log2(size / 65536))
+        return cls(section_size)
+
+
+class PartitionType(IntEnum):
+    """Enumeration for partition types."""
+
+    EMPTY = 0  # partition descriptor is free
+    IGEL_RAW = 1  # an uncompressed an writable partition
+    IGEL_COMPRESSED = 2  # a compressed read-only partition
+    IGEL_FREELIST = 3  # only used by the partition directory
+    IGEL_RAW_RO = (
+        4  # an uncompressed read-only partition (so CRC is valid and should be checked)
+    )
+    IGEL_RAW_4K_ALIGNED = (
+        5  # an uncompressed an writable partition which is aligned to 4k sectors
+    )
+
+
+class PartitionFlag(IntFlag):
+    """Enumeration for partition flags."""
+
+    UPDATE_IN_PROGRESS = 0x100  # flag indicating a not yet to use partition
+    HAS_IGEL_HASH = (
+        0x200  # flag indicating the presence of a igel hash block after the header
+    )
+    HAS_CRYPT = 0x400  # flag indicating the presence of a encryption
+
+
+class ExtentType(IntEnum):
+    """Enumeration for extent types."""
+
+    KERNEL = 1
+    RAMDISK = 2
+    SPLASH = 3
+    CHECKSUMS = 4
+    SQUASHFS = 5
+    WRITEABLE = 6
+    LOGIN = 7
+
+
+LOG2_SECT_SIZE = SectionSize.SECT_SIZE_256K
+IGF_SECTION_SIZE = 0x10000 << (LOG2_SECT_SIZE & 0xF)
+IGF_SECTION_SHIFT = 16 + (LOG2_SECT_SIZE & 0xF)
+
+
+def get_start_of_section(n: int) -> int:
+    """Return start of section."""
+    return n << IGF_SECTION_SHIFT
+
+
+def get_section_of(x: int) -> int:
+    """Return section for specified number."""
+    return x >> IGF_SECTION_SHIFT
+
+
+def get_offset_of(x: int) -> int:
+    """Return offset for specified number."""
+    return x & (IGF_SECTION_SIZE - 1)
+
+
+IGF_SECT_HDR_LEN = 32
+IGF_SECT_DATA_LEN = IGF_SECTION_SIZE - IGF_SECT_HDR_LEN
+
+IGF_MAX_MINORS = 256
+
+DIRECTORY_MAGIC = 0x52494450  # PDIR
+CRC_DUMMY = 0x55555555
+
+IGEL_BOOTREG_OFFSET = 0x00000000
+IGEL_BOOTREG_SIZE = 0x00008000  # 32K size
+IGEL_BOOTREG_MAGIC = 0x4F4F42204C454749  # IGEL BOO
+
+DIR_OFFSET = IGEL_BOOTREG_OFFSET + IGEL_BOOTREG_SIZE  # Starts after the boot registry
+DIR_SIZE = (
+    IGF_SECTION_SIZE - DIR_OFFSET
+)  # Reserve the rest of section #0 for the directory
+
+DIR_MAX_MINORS = 512
+MAX_FRAGMENTS = 1404
+
+BOOTSPLASH_MAGIC = "IGELBootSplash"
+
+BOOTREG_MAGIC = "163L"
+BOOTREG_IDENT = "IGEL BOOTREGISTRY"
+BOOTREG_FLAG_LOCK = 0x0001
diff --git a/igelfs/filesystem.py b/igelfs/filesystem.py
new file mode 100644
index 0000000..c54be4e
--- /dev/null
+++ b/igelfs/filesystem.py
@@ -0,0 +1,106 @@
+"""Python implementation to handle IGEL filesystems."""
+
+from dataclasses import dataclass
+from pathlib import Path
+
+from igelfs.constants import (
+    DIR_OFFSET,
+    DIR_SIZE,
+    IGEL_BOOTREG_OFFSET,
+    IGEL_BOOTREG_SIZE,
+    IGF_SECT_DATA_LEN,
+    IGF_SECT_HDR_LEN,
+    IGF_SECTION_SIZE,
+    SectionSize,
+    get_section_of,
+    get_start_of_section,
+)
+from igelfs.models import BootRegistryHeader, Directory, SectionHeader
+
+
+@dataclass
+class Section:
+    """Dataclass to handle section of an image."""
+
+    path: str | Path
+    offset: int
+    data: bytes
+    index: int | None = None
+
+    def __post_init__(self) -> None:
+        """Handle post-initialisation of dataclass instance."""
+        if self.index is None:
+            self.index = get_section_of(self.offset)
+
+    @property
+    def size(self) -> int:
+        """Return size of data."""
+        return len(self.data)
+
+    @property
+    def header(self) -> bytes:
+        """Return header of data."""
+        return SectionHeader.from_bytes(self.data[:IGF_SECT_HDR_LEN])
+
+    @property
+    def payload(self) -> bytes:
+        """Return header of data."""
+        return self.data[IGF_SECT_HDR_LEN:IGF_SECT_DATA_LEN]
+
+    def write(self, path: str | Path) -> Path:
+        """Write data of section to specified path and return Path."""
+        path = Path(path).absolute()
+        with open(path, "wb") as fd:
+            fd.write(self.data)
+        return path
+
+
+class Filesystem:
+    """IGEL filesystem class to handle properties and methods."""
+
+    def __init__(self, path: str | Path) -> None:
+        """Initialise instance."""
+        self.path = Path(path).absolute()
+
+    def __getitem__(self, index: int) -> Section:
+        """Implement getitem method."""
+        return self.get_section_by_index(index)
+
+    @property
+    def size(self) -> int:
+        """Return size of image."""
+        return self.path.stat().st_size
+
+    @property
+    def section_size(self) -> SectionSize:
+        """Return SectionSize for image."""
+        return SectionSize.get(self.size)
+
+    @property
+    def bootreg(self) -> BootRegistryHeader:
+        """Return bootreg Section for image."""
+        data = self.get_data(IGEL_BOOTREG_OFFSET, IGEL_BOOTREG_SIZE)
+        return BootRegistryHeader.from_bytes(data)
+
+    @property
+    def directory(self) -> Directory:
+        """Return directory Section for image."""
+        data = self.get_data(DIR_OFFSET, DIR_SIZE)
+        return Directory.from_bytes(data)
+
+    def get_data(self, offset: int = 0, size: int = -1):
+        """Return data for specified offset and size."""
+        with open(self.path, "rb") as fd:
+            fd.seek(offset)
+            return fd.read(size)
+
+    def get_section_by_offset(self, offset: int, size: int) -> Section:
+        """Return section of image by offset and size."""
+        data = self.get_data(offset, size)
+        return Section(path=self.path, offset=offset, data=data)
+
+    def get_section_by_index(self, index: int) -> Section:
+        """Return section of image by index."""
+        offset = get_start_of_section(index)
+        data = self.get_data(offset, IGF_SECTION_SIZE)
+        return Section(path=self.path, index=index, offset=offset, data=data)
diff --git a/igelfs/models.py b/igelfs/models.py
new file mode 100644
index 0000000..8ef51be
--- /dev/null
+++ b/igelfs/models.py
@@ -0,0 +1,190 @@
+"""Data models for the IGEL filesystem."""
+
+from dataclasses import dataclass
+from typing import ClassVar
+
+from igelfs.base import BaseDataModel, DataModelCollection
+from igelfs.constants import DIR_MAX_MINORS, MAX_FRAGMENTS
+
+
+@dataclass
+class BootRegistryEntry(BaseDataModel):
+    """Dataclass to describe each entry of boot registry."""
+
+    MODEL_ATTRIBUTE_SIZES: ClassVar[dict[str, int]] = {"flag": 2, "data": 62}
+
+    flag: int  # first 9 bits next, 1 bit next present, 6 bit len key
+    data: bytes
+
+
+@dataclass
+class BootRegistryHeader(BaseDataModel):
+    """Dataclass to handle boot registry header data."""
+
+    MODEL_ATTRIBUTE_SIZES: ClassVar[dict[str, int]] = {
+        "ident_legacy": 17,
+        "magic": 4,
+        "hdr_version": 1,
+        "boot_id": 21,
+        "enc_alg": 1,
+        "flags": 2,
+        "empty": 82,
+        "free": 64,
+        "used": 64,
+        "dir": 252,
+        "reserve": 4,
+        "entry": 504 * BootRegistryEntry.get_model_size(),
+    }
+
+    ident_legacy: str  # "IGEL BOOTREGISTRY"
+    magic: str  # BOOTREG_MAGIC
+    hdr_version: int  # 0x01 for the first
+    boot_id: str  # boot_id
+    enc_alg: int  # encryption algorithm
+    flags: int  # flags
+    empty: bytes  # placeholder
+    free: bytes  # bitmap with free 64 byte blocks
+    used: bytes  # bitmap with used 64 byte blocks
+    dir: bytes  # directory bitmap (4 bits for each block -> key len)
+    reserve: bytes  # placeholder
+    entry: DataModelCollection[BootRegistryEntry]  # real data
+
+
+@dataclass
+class SectionHeader(BaseDataModel):
+    """Dataclass to handle section header data."""
+
+    MODEL_ATTRIBUTE_SIZES: ClassVar[dict[str, int]] = {
+        "crc": 4,
+        "magic": 4,
+        "section_type": 2,
+        "section_size": 2,
+        "partition_minor": 4,
+        "generation": 2,
+        "section_in_minor": 4,
+        "next_section": 4,
+    }
+
+    crc: int  # crc of the rest of the section         */
+    magic: int  # magic number (erase count long ago)
+    section_type: int
+    section_size: int  # log2((section size in bytes) / 65536)
+    partition_minor: int  # partition number (driver minor number)
+    generation: int  # update generation count
+    section_in_minor: int  # n = 0,...,(number of sect.-1)
+    next_section: int  # index of the next section or 0xffffffff = end of chain
+
+
+@dataclass
+class PartitionHeader(BaseDataModel):
+    """Dataclass to handle partition header data."""
+
+    MODEL_ATTRIBUTE_SIZES: ClassVar[dict[str, int]] = {
+        "type": 2,
+        "hdrlen": 2,
+        "partlen": 8,
+        "n_blocks": 8,
+        "offset_blocktable": 8,
+        "offset_blocks": 8,
+        "n_clusters": 4,
+        "cluster_shift": 2,
+        "n_extents": 2,
+        "name": 16,
+        "update_hash": 64,
+    }
+
+    type: int  # partition type
+    hdrlen: int  # length of the complete partition header
+    partlen: int  # length of this partition (incl. header)
+    n_blocks: int  # number of uncompressed 1k blocks
+    offset_blocktable: int  # needed for compressed partitions
+    offset_blocks: int  # start of the compressed block clusters
+    n_clusters: int  # number of clusters
+    cluster_shift: int  # 2^x blocks make up a cluster
+    n_extents: int  # number of extents, if any
+    name: bytes  # optional character code (for pdir)
+    # A high level hash over almost all files, used to determine if an update is needed
+    update_hash: bytes
+
+
+@dataclass
+class FragmentDescriptor(BaseDataModel):
+    """Dataclass to handle fragment descriptors."""
+
+    MODEL_ATTRIBUTE_SIZES: ClassVar[dict[str, int]] = {"first_section": 4, "length": 4}
+
+    first_section: int
+    length: int  # number of sections
+
+
+@dataclass
+class PartitionDescriptor(BaseDataModel):
+    """Dataclass to handle partition descriptors."""
+
+    MODEL_ATTRIBUTE_SIZES: ClassVar[dict[str, int]] = {
+        "minor": 4,
+        "type": 2,
+        "first_fragment": 2,
+        "n_fragments": 2,
+    }
+
+    minor: int  # a replication of igf_sect_hdr.partition
+    type: int  # partition type, a replication of igf_part_hdr.type
+    first_fragment: int  # index of the first fragment
+    n_fragments: int  # number of additional fragments
+
+
+@dataclass
+class Directory(BaseDataModel):
+    """Dataclass to handle directory header data."""
+
+    MODEL_ATTRIBUTE_SIZES: ClassVar[dict[str, int]] = {
+        "magic": 4,
+        "crc": 4,
+        "dir_type": 2,
+        "max_minors": 2,
+        "version": 2,
+        "dummy": 2,
+        "n_fragments": 4,
+        "max_fragments": 4,
+        "extension": 8,
+        "partition": DIR_MAX_MINORS * PartitionDescriptor.get_model_size(),
+        "fragment": MAX_FRAGMENTS * FragmentDescriptor.get_model_size(),
+    }
+
+    magic: str  # DIRECTORY_MAGIC
+    crc: int
+    dir_type: int  # allows for future extensions
+    max_minors: int  # redundant, allows for dynamic part table
+    version: int  # update count, never used so far
+    dummy: int  # for future extensions
+    n_fragments: int  # total number of fragments
+    max_fragments: int  # redundant, allows for dynamic frag table
+    extension: bytes  # unspecified, for future extensions
+    partition: DataModelCollection[PartitionDescriptor]
+    fragment: DataModelCollection[FragmentDescriptor]
+
+
+@dataclass
+class BootsplashHeader(BaseDataModel):
+    """Dataclass to handle bootsplash header data."""
+
+    MODEL_ATTRIBUTE_SIZES: ClassVar[dict[str, int]] = {"magic": 14, "num_splashs": 1}
+
+    magic: str  # BOOTSPLASH_MAGIC
+    num_splashs: int
+
+
+@dataclass
+class Bootsplash(BaseDataModel):
+    """Dataclass to handle bootsplash data."""
+
+    MODEL_ATTRIBUTE_SIZES: ClassVar[dict[str, int]] = {
+        "offset": 8,
+        "length": 8,
+        "ident": 8,
+    }
+
+    offset: int
+    length: int
+    ident: bytes
diff --git a/igelfs/tests/conftest.py b/igelfs/tests/conftest.py
new file mode 100644
index 0000000..16bb573
--- /dev/null
+++ b/igelfs/tests/conftest.py
@@ -0,0 +1,23 @@
+"""Testing configuration."""
+
+import pytest
+
+from igelfs.filesystem import Filesystem
+from igelfs.models import BootRegistryHeader
+
+
+def pytest_addoption(parser):
+    """Parse command-line arguments."""
+    parser.addoption("--path", action="store", default="default image path")
+
+
+@pytest.fixture(scope="session")
+def fs(pytestconfig) -> Filesystem:
+    """Return Filesystem instance for image."""
+    return Filesystem(pytestconfig.getoption("path"))
+
+
+@pytest.fixture(scope="session")
+def bootreg(fs: Filesystem) -> BootRegistryHeader:
+    """Return BootRegistryHeader instance."""
+    return fs.bootreg
diff --git a/igelfs/tests/test_bootreg.py b/igelfs/tests/test_bootreg.py
new file mode 100644
index 0000000..b858ffe
--- /dev/null
+++ b/igelfs/tests/test_bootreg.py
@@ -0,0 +1,23 @@
+"""Unit tests for the boot registry."""
+
+from igelfs.constants import BOOTREG_IDENT, BOOTREG_MAGIC, IGEL_BOOTREG_SIZE
+
+
+def test_bootreg_size(bootreg) -> None:
+    """Test size of boot registry."""
+    assert bootreg.size == IGEL_BOOTREG_SIZE
+
+
+def test_bootreg_verify(bootreg) -> None:
+    """Test verification of boot registry."""
+    assert bootreg.verify()
+
+
+def test_bootreg_ident_legacy(bootreg) -> None:
+    """Test ident_legacy attribute of boot registry."""
+    assert bootreg.ident_legacy == BOOTREG_IDENT
+
+
+def test_bootreg_magic(bootreg) -> None:
+    """Test magic attribute of boot registry."""
+    assert bootreg.magic == BOOTREG_MAGIC