Skip to content

feat: Pre-compile struct #56

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Draft
wants to merge 1 commit into
base: main
Choose a base branch
from
Draft

feat: Pre-compile struct #56

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
97 changes: 40 additions & 57 deletions src/pybag/encoding/cdr.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -20,94 +20,77 @@ def __init__(self, data: bytes):
# Skip first 4 bytes
self._data = BytesReader(data[4:])

# Pre-compiled primitive struct parsers
self._primitive_parsers = {
'bool': struct.Struct('?'),
'int8': struct.Struct('<b' if self._is_little_endian else '>b'),
'uint8': struct.Struct('<B' if self._is_little_endian else '>B'),
'char': struct.Struct('<c' if self._is_little_endian else '>c'),
'int16': struct.Struct('<h' if self._is_little_endian else '>h'),
'uint16': struct.Struct('<H' if self._is_little_endian else '>H'),
'int32': struct.Struct('<i' if self._is_little_endian else '>i'),
'uint32': struct.Struct('<I' if self._is_little_endian else '>I'),
'int64': struct.Struct('<q' if self._is_little_endian else '>q'),
'uint64': struct.Struct('<Q' if self._is_little_endian else '>Q'),
'float32': struct.Struct('<f' if self._is_little_endian else '>f'),
'float64': struct.Struct('<d' if self._is_little_endian else '>d'),
}

def parse(self, type_str: str) -> Any:
return getattr(self, type_str)()

# Primitive parsers -------------------------------------------------

def bool(self) -> bool:
value = struct.unpack('?', self._data.align(1).read(1))[0]
return value
bool_data = self._data.align(1).read(1)
return self._primitive_parsers['bool'].unpack(bool_data)[0]

def int8(self) -> int:
value = struct.unpack(
'<b' if self._is_little_endian else '>b',
self._data.align(1).read(1)
)[0]
return value
int8_data = self._data.align(1).read(1)
return self._primitive_parsers['int8'].unpack(int8_data)[0]

def uint8(self) -> int:
value = struct.unpack(
'<B' if self._is_little_endian else '>B',
self._data.align(1).read(1)
)[0]
return value
uint8_data = self._data.align(1).read(1)
return self._primitive_parsers['uint8'].unpack(uint8_data)[0]

def byte(self) -> bytes:
return self._data.align(1).read(1)

def char(self) -> str:
value = struct.unpack(
'<c' if self._is_little_endian else '>c',
self._data.align(1).read(1)
)[0]
return value.decode()
char_data = self._data.align(1).read(1)
return self._primitive_parsers['char'].unpack(char_data)[0].decode()

def int16(self) -> int:
value = struct.unpack(
'<h' if self._is_little_endian else '>h',
self._data.align(2).read(2)
)[0]
return value
int16_data = self._data.align(2).read(2)
return self._primitive_parsers['int16'].unpack(int16_data)[0]

def uint16(self) -> int:
value = struct.unpack(
'<H' if self._is_little_endian else '>H',
self._data.align(2).read(2)
)[0]
return value
uint16_data = self._data.align(2).read(2)
return self._primitive_parsers['uint16'].unpack(uint16_data)[0]

def int32(self) -> int:
value = struct.unpack(
'<i' if self._is_little_endian else '>i',
self._data.align(4).read(4)
)[0]
return value
int32_data = self._data.align(4).read(4)
return self._primitive_parsers['int32'].unpack(int32_data)[0]

def uint32(self) -> int:
value = struct.unpack(
'<I' if self._is_little_endian else '>I',
self._data.align(4).read(4)
)[0]
return value
uint32_data = self._data.align(4).read(4)
return self._primitive_parsers['uint32'].unpack(uint32_data)[0]

def int64(self) -> int:
value = struct.unpack(
'<q' if self._is_little_endian else '>q',
self._data.align(8).read(8)
)[0]
return value
int64_data = self._data.align(8).read(8)
return self._primitive_parsers['int64'].unpack(int64_data)[0]

def uint64(self) -> int:
value = struct.unpack(
'<Q' if self._is_little_endian else '>Q',
self._data.align(8).read(8)
)[0]
return value
uint64_data = self._data.align(8).read(8)
return self._primitive_parsers['uint64'].unpack(uint64_data)[0]

def float32(self) -> float:
value = struct.unpack(
'<f' if self._is_little_endian else '>f',
self._data.align(4).read(4)
)[0]
return value
float32_data = self._data.align(4).read(4)
return self._primitive_parsers['float32'].unpack(float32_data)[0]

def float64(self) -> float:
value = struct.unpack(
'<d' if self._is_little_endian else '>d',
self._data.align(8).read(8)
)[0]
return value
float64_data = self._data.align(8).read(8)
return self._primitive_parsers['float64'].unpack(float64_data)[0]

def string(self) -> str:
# Strings are null-terminated
Expand Down