Bitmap font format for the GRUB 2 bootloader.
This page hosts a formal specification of GRUB 2 font using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
All parsing code for Python generated by Kaitai Struct depends on the Python runtime library. You have to install it before you can parse data.
The Python runtime library can be installed from PyPI:
python3 -m pip install kaitaistructParse a local file and get structure in memory:
data = Grub2Font.from_file("path/to/local/file.pf2")
Or parse structure from a bytes:
from kaitaistruct import KaitaiStream, BytesIO
raw = b"\x00\x01\x02..."
data = Grub2Font(KaitaiStream(BytesIO(raw)))
After that, one can get various attributes from the structure by invoking getter methods like:
data.sections # => The "DATA" section acts as a terminator. The documentation says:
"A marker that indicates the remainder of the file is data accessed
via the character index (CHIX) section. When reading this font file,
the rest of the file can be ignored when scanning the sections."
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
import kaitaistruct
from kaitaistruct import KaitaiStruct, KaitaiStream, BytesIO
if getattr(kaitaistruct, 'API_VERSION', (0, 9)) < (0, 9):
raise Exception("Incompatible Kaitai Struct Python API: 0.9 or later is required, but you have %s" % (kaitaistruct.__version__))
class Grub2Font(KaitaiStruct):
"""Bitmap font format for the GRUB 2 bootloader.
.. seealso::
Source - https://grub.gibibit.com/New_font_format
"""
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.magic = self._io.read_bytes(12)
if not self.magic == b"\x46\x49\x4C\x45\x00\x00\x00\x04\x50\x46\x46\x32":
raise kaitaistruct.ValidationNotEqualError(b"\x46\x49\x4C\x45\x00\x00\x00\x04\x50\x46\x46\x32", self.magic, self._io, u"/seq/0")
self.sections = []
i = 0
while True:
_ = Grub2Font.Section(self._io, self, self._root)
self.sections.append(_)
if _.section_type == u"DATA":
break
i += 1
class PtszSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.font_point_size = self._io.read_u2be()
class FamiSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.font_family_name = (self._io.read_bytes_term(0, False, True, True)).decode(u"ASCII")
class WeigSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.font_weight = (self._io.read_bytes_term(0, False, True, True)).decode(u"ASCII")
class MaxwSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.maximum_character_width = self._io.read_u2be()
class DescSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.descent_in_pixels = self._io.read_u2be()
class Section(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.section_type = (self._io.read_bytes(4)).decode(u"ASCII")
self.len_body = self._io.read_u4be()
if self.section_type != u"DATA":
_on = self.section_type
if _on == u"MAXH":
self._raw_body = self._io.read_bytes(self.len_body)
_io__raw_body = KaitaiStream(BytesIO(self._raw_body))
self.body = Grub2Font.MaxhSection(_io__raw_body, self, self._root)
elif _on == u"FAMI":
self._raw_body = self._io.read_bytes(self.len_body)
_io__raw_body = KaitaiStream(BytesIO(self._raw_body))
self.body = Grub2Font.FamiSection(_io__raw_body, self, self._root)
elif _on == u"PTSZ":
self._raw_body = self._io.read_bytes(self.len_body)
_io__raw_body = KaitaiStream(BytesIO(self._raw_body))
self.body = Grub2Font.PtszSection(_io__raw_body, self, self._root)
elif _on == u"MAXW":
self._raw_body = self._io.read_bytes(self.len_body)
_io__raw_body = KaitaiStream(BytesIO(self._raw_body))
self.body = Grub2Font.MaxwSection(_io__raw_body, self, self._root)
elif _on == u"SLAN":
self._raw_body = self._io.read_bytes(self.len_body)
_io__raw_body = KaitaiStream(BytesIO(self._raw_body))
self.body = Grub2Font.SlanSection(_io__raw_body, self, self._root)
elif _on == u"WEIG":
self._raw_body = self._io.read_bytes(self.len_body)
_io__raw_body = KaitaiStream(BytesIO(self._raw_body))
self.body = Grub2Font.WeigSection(_io__raw_body, self, self._root)
elif _on == u"CHIX":
self._raw_body = self._io.read_bytes(self.len_body)
_io__raw_body = KaitaiStream(BytesIO(self._raw_body))
self.body = Grub2Font.ChixSection(_io__raw_body, self, self._root)
elif _on == u"DESC":
self._raw_body = self._io.read_bytes(self.len_body)
_io__raw_body = KaitaiStream(BytesIO(self._raw_body))
self.body = Grub2Font.DescSection(_io__raw_body, self, self._root)
elif _on == u"NAME":
self._raw_body = self._io.read_bytes(self.len_body)
_io__raw_body = KaitaiStream(BytesIO(self._raw_body))
self.body = Grub2Font.NameSection(_io__raw_body, self, self._root)
elif _on == u"ASCE":
self._raw_body = self._io.read_bytes(self.len_body)
_io__raw_body = KaitaiStream(BytesIO(self._raw_body))
self.body = Grub2Font.AsceSection(_io__raw_body, self, self._root)
else:
self.body = self._io.read_bytes(self.len_body)
class AsceSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.ascent_in_pixels = self._io.read_u2be()
class ChixSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.characters = []
i = 0
while not self._io.is_eof():
self.characters.append(Grub2Font.ChixSection.Character(self._io, self, self._root))
i += 1
class Character(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.code_point = self._io.read_u4be()
self.flags = self._io.read_u1()
self.ofs_definition = self._io.read_u4be()
@property
def definition(self):
if hasattr(self, '_m_definition'):
return self._m_definition
io = self._root._io
_pos = io.pos()
io.seek(self.ofs_definition)
self._m_definition = Grub2Font.ChixSection.CharacterDefinition(io, self, self._root)
io.seek(_pos)
return getattr(self, '_m_definition', None)
class CharacterDefinition(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.width = self._io.read_u2be()
self.height = self._io.read_u2be()
self.x_offset = self._io.read_s2be()
self.y_offset = self._io.read_s2be()
self.device_width = self._io.read_s2be()
self.bitmap_data = self._io.read_bytes(((self.width * self.height) + 7) // 8)
class MaxhSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.maximum_character_height = self._io.read_u2be()
class NameSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.font_name = (self._io.read_bytes_term(0, False, True, True)).decode(u"ASCII")
class SlanSection(KaitaiStruct):
def __init__(self, _io, _parent=None, _root=None):
self._io = _io
self._parent = _parent
self._root = _root if _root else self
self._read()
def _read(self):
self.font_slant = (self._io.read_bytes_term(0, False, True, True)).decode(u"ASCII")