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| author | Xusheng <xusheng@vector35.com> | 2021-07-01 12:34:30 +0800 |
|---|---|---|
| committer | Xusheng Li <xushengli@protonmail.com> | 2021-07-05 10:11:47 +0800 |
| commit | 13ff200ba134b8704f37eca99c42b70dab0d17dc (patch) | |
| tree | 876b3db3c53f704b31152aeaede1f2edc9d27b24 /python/examples/kaitai/vlq_base128_le.py | |
| parent | 4039a800349dcd587833d3e27d9137e4649818f4 (diff) | |
Remove snippet and kaitai plugin. Note their individual links.
Diffstat (limited to 'python/examples/kaitai/vlq_base128_le.py')
| -rw-r--r-- | python/examples/kaitai/vlq_base128_le.py | 108 |
1 files changed, 0 insertions, 108 deletions
diff --git a/python/examples/kaitai/vlq_base128_le.py b/python/examples/kaitai/vlq_base128_le.py deleted file mode 100644 index 6fa8d43b..00000000 --- a/python/examples/kaitai/vlq_base128_le.py +++ /dev/null @@ -1,108 +0,0 @@ -# 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 -import collections - - -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 - consist of 1-bit flag of continuation and 7-bit value chunk, 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. - """ - SEQ_FIELDS = ["groups"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['groups']['start'] = self._io.pos() - self.groups = [] - i = 0 - while True: - if not 'arr' in self._debug['groups']: - self._debug['groups']['arr'] = [] - self._debug['groups']['arr'].append({'start': self._io.pos()}) - _t_groups = self._root.Group(self._io, self, self._root) - _t_groups._read() - _ = _t_groups - self.groups.append(_) - self._debug['groups']['arr'][len(self.groups) - 1]['end'] = self._io.pos() - if not (_.has_next): - break - i += 1 - self._debug['groups']['end'] = self._io.pos() - - class Group(KaitaiStruct): - """One byte group, clearly divided into 7-bit "value" chunk and 1-bit "continuation" flag. - """ - SEQ_FIELDS = ["b"] - def __init__(self, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['b']['start'] = self._io.pos() - self.b = self._io.read_u1() - self._debug['b']['end'] = self._io.pos() - - @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 chunk 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 - - |
