Current File : //usr/lib/python3/dist-packages/mitmproxy/contrib/kaitaistruct/vlq_base128_le.py
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
from pkg_resources import parse_version
from kaitaistruct import __version__ as ks_version, KaitaiStruct, KaitaiStream, BytesIO
if parse_version(ks_version) < parse_version('0.7'):
raise Exception("Incompatible Kaitai Struct Python API: 0.7 or later is required, but you have %s" % (ks_version))
class VlqBase128Le(KaitaiStruct):
"""A variable-length unsigned integer using base128 encoding. 1-byte groups
consists of 1-bit flag of continuation and 7-bit value, and are ordered
"least significant group first", i.e. in "little-endian" manner.
This particular encoding is specified and used in:
* DWARF debug file format, where it's dubbed "unsigned LEB128" or "ULEB128".
http://dwarfstd.org/doc/dwarf-2.0.0.pdf - page 139
* Google Protocol Buffers, where it's called "Base 128 Varints".
https://developers.google.com/protocol-buffers/docs/encoding?csw=1#varints
* Apache Lucene, where it's called "VInt"
http://lucene.apache.org/core/3_5_0/fileformats.html#VInt
* Apache Avro uses this as a basis for integer encoding, adding ZigZag on
top of it for signed ints
http://avro.apache.org/docs/current/spec.html#binary_encode_primitive
More information on this encoding is available at https://en.wikipedia.org/wiki/LEB128
This particular implementation supports serialized values to up 8 bytes long.
"""
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.groups = []
while True:
_ = self._root.Group(self._io, self, self._root)
self.groups.append(_)
if not (_.has_next):
break
class Group(KaitaiStruct):
"""One byte group, clearly divided into 7-bit "value" and 1-bit "has continuation
in the next byte" flag.
"""
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.b = self._io.read_u1()
@property
def has_next(self):
"""If true, then we have more bytes to read."""
if hasattr(self, '_m_has_next'):
return self._m_has_next if hasattr(self, '_m_has_next') else None
self._m_has_next = (self.b & 128) != 0
return self._m_has_next if hasattr(self, '_m_has_next') else None
@property
def value(self):
"""The 7-bit (base128) numeric value of this group."""
if hasattr(self, '_m_value'):
return self._m_value if hasattr(self, '_m_value') else None
self._m_value = (self.b & 127)
return self._m_value if hasattr(self, '_m_value') else None
@property
def len(self):
if hasattr(self, '_m_len'):
return self._m_len if hasattr(self, '_m_len') else None
self._m_len = len(self.groups)
return self._m_len if hasattr(self, '_m_len') else None
@property
def value(self):
"""Resulting value as normal integer."""
if hasattr(self, '_m_value'):
return self._m_value if hasattr(self, '_m_value') else None
self._m_value = (((((((self.groups[0].value + ((self.groups[1].value << 7) if self.len >= 2 else 0)) + ((self.groups[2].value << 14) if self.len >= 3 else 0)) + ((self.groups[3].value << 21) if self.len >= 4 else 0)) + ((self.groups[4].value << 28) if self.len >= 5 else 0)) + ((self.groups[5].value << 35) if self.len >= 6 else 0)) + ((self.groups[6].value << 42) if self.len >= 7 else 0)) + ((self.groups[7].value << 49) if self.len >= 8 else 0))
return self._m_value if hasattr(self, '_m_value') else None
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