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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/bcd.py | |
| parent | 4039a800349dcd587833d3e27d9137e4649818f4 (diff) | |
Remove snippet and kaitai plugin. Note their individual links.
Diffstat (limited to 'python/examples/kaitai/bcd.py')
| -rw-r--r-- | python/examples/kaitai/bcd.py | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/python/examples/kaitai/bcd.py b/python/examples/kaitai/bcd.py deleted file mode 100644 index 3f2afb80..00000000 --- a/python/examples/kaitai/bcd.py +++ /dev/null @@ -1,110 +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 Bcd(KaitaiStruct): - """BCD (Binary Coded Decimals) is a common way to encode integer - numbers in a way that makes human-readable output somewhat - simpler. In this encoding scheme, every decimal digit is encoded as - either a single byte (8 bits), or a nibble (half of a byte, 4 - bits). This obviously wastes a lot of bits, but it makes translation - into human-readable string much easier than traditional - binary-to-decimal conversion process, which includes lots of - divisions by 10. - - For example, encoding integer 31337 in 8-digit, 8 bits per digit, - big endian order of digits BCD format yields - - ``` - 00 00 00 03 01 03 03 07 - ``` - - Encoding the same integer as 8-digit, 4 bits per digit, little - endian order BCD format would yield: - - ``` - 73 31 30 00 - ``` - - Using this type of encoding in Kaitai Struct is pretty - straightforward: one calls for this type, specifying desired - encoding parameters, and gets result using either `as_int` or - `as_str` attributes. - """ - SEQ_FIELDS = ["digits"] - def __init__(self, num_digits, bits_per_digit, is_le, _io, _parent=None, _root=None): - self._io = _io - self._parent = _parent - self._root = _root if _root else self - self.num_digits = num_digits - self.bits_per_digit = bits_per_digit - self.is_le = is_le - self._debug = collections.defaultdict(dict) - - def _read(self): - self._debug['digits']['start'] = self._io.pos() - self.digits = [None] * (self.num_digits) - for i in range(self.num_digits): - if not 'arr' in self._debug['digits']: - self._debug['digits']['arr'] = [] - self._debug['digits']['arr'].append({'start': self._io.pos()}) - _on = self.bits_per_digit - if _on == 4: - if not 'arr' in self._debug['digits']: - self._debug['digits']['arr'] = [] - self._debug['digits']['arr'].append({'start': self._io.pos()}) - self.digits[i] = self._io.read_bits_int(4) - self._debug['digits']['arr'][i]['end'] = self._io.pos() - elif _on == 8: - if not 'arr' in self._debug['digits']: - self._debug['digits']['arr'] = [] - self._debug['digits']['arr'].append({'start': self._io.pos()}) - self.digits[i] = self._io.read_u1() - self._debug['digits']['arr'][i]['end'] = self._io.pos() - self._debug['digits']['arr'][i]['end'] = self._io.pos() - - self._debug['digits']['end'] = self._io.pos() - - @property - def as_int(self): - """Value of this BCD number as integer. Endianness would be selected based on `is_le` parameter given.""" - if hasattr(self, '_m_as_int'): - return self._m_as_int if hasattr(self, '_m_as_int') else None - - self._m_as_int = (self.as_int_le if self.is_le else self.as_int_be) - return self._m_as_int if hasattr(self, '_m_as_int') else None - - @property - def as_int_le(self): - """Value of this BCD number as integer (treating digit order as little-endian).""" - if hasattr(self, '_m_as_int_le'): - return self._m_as_int_le if hasattr(self, '_m_as_int_le') else None - - self._m_as_int_le = (self.digits[0] + (0 if self.num_digits < 2 else ((self.digits[1] * 10) + (0 if self.num_digits < 3 else ((self.digits[2] * 100) + (0 if self.num_digits < 4 else ((self.digits[3] * 1000) + (0 if self.num_digits < 5 else ((self.digits[4] * 10000) + (0 if self.num_digits < 6 else ((self.digits[5] * 100000) + (0 if self.num_digits < 7 else ((self.digits[6] * 1000000) + (0 if self.num_digits < 8 else (self.digits[7] * 10000000))))))))))))))) - return self._m_as_int_le if hasattr(self, '_m_as_int_le') else None - - @property - def last_idx(self): - """Index of last digit (0-based).""" - if hasattr(self, '_m_last_idx'): - return self._m_last_idx if hasattr(self, '_m_last_idx') else None - - self._m_last_idx = (self.num_digits - 1) - return self._m_last_idx if hasattr(self, '_m_last_idx') else None - - @property - def as_int_be(self): - """Value of this BCD number as integer (treating digit order as big-endian).""" - if hasattr(self, '_m_as_int_be'): - return self._m_as_int_be if hasattr(self, '_m_as_int_be') else None - - self._m_as_int_be = (self.digits[self.last_idx] + (0 if self.num_digits < 2 else ((self.digits[(self.last_idx - 1)] * 10) + (0 if self.num_digits < 3 else ((self.digits[(self.last_idx - 2)] * 100) + (0 if self.num_digits < 4 else ((self.digits[(self.last_idx - 3)] * 1000) + (0 if self.num_digits < 5 else ((self.digits[(self.last_idx - 4)] * 10000) + (0 if self.num_digits < 6 else ((self.digits[(self.last_idx - 5)] * 100000) + (0 if self.num_digits < 7 else ((self.digits[(self.last_idx - 6)] * 1000000) + (0 if self.num_digits < 8 else (self.digits[(self.last_idx - 7)] * 10000000))))))))))))))) - return self._m_as_int_be if hasattr(self, '_m_as_int_be') else None - - |
