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f20080305d
Определение специфических рекомендаций (матрица профилей §8):
1. Ж/д слой (закрыт мёртвый railway ×2.5 у РАС):
- /api/v1/water/{case_id} отдаёт railway=rail как LineString
(без service/industrial/military веток), кэш общий v2;
- railway_warning «перекрыть/проверить немедленно» по профилям;
- SearchMap: Polyline слой ж/д (тёмно-красный), счётчики 💧/🚂.
2. cant_swim → профиль не_умеет_плавать (water ×3.0, без изменения
радиуса, critical_warning «обследовать водоёмы НЕМЕДЛЕННО»):
- раньше чекбокс влиял только на текст, в скоринге был пробел;
- derive в analyze._derive_profiles — работает и для closed_cases.
3. unmodeled_profiles: ДЦП/слабое зрение/слух — честная пометка
«вне поведенческой модели» с пояснением (vector_tasks B12:
профили без аналога не выдавать за учтённые); блок на фронте
в карточке здоровья.
Площадь воды: сферический эксцесс, проверен на квадрате 53° (744017 м²
vs 743272 точного). Тесты: 202 passed (новый test_cant_swim_profile).
109 lines
3.2 KiB
Python
109 lines
3.2 KiB
Python
"""
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ELF file parser.
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This provides a class ``ELFFile`` that parses an ELF executable in a similar
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interface to ``ZipFile``. Only the read interface is implemented.
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ELF header: https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.eheader.html
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"""
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from __future__ import annotations
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import enum
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import os
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import struct
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from typing import IO
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class ELFInvalid(ValueError):
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pass
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class EIClass(enum.IntEnum):
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C32 = 1
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C64 = 2
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class EIData(enum.IntEnum):
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Lsb = 1
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Msb = 2
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class EMachine(enum.IntEnum):
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I386 = 3
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S390 = 22
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Arm = 40
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X8664 = 62
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AArch64 = 183
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class ELFFile:
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"""
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Representation of an ELF executable.
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"""
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def __init__(self, f: IO[bytes]) -> None:
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self._f = f
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try:
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ident = self._read("16B")
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except struct.error as e:
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raise ELFInvalid("unable to parse identification") from e
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magic = bytes(ident[:4])
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if magic != b"\x7fELF":
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raise ELFInvalid(f"invalid magic: {magic!r}")
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self.capacity = ident[4] # Format for program header (bitness).
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self.encoding = ident[5] # Data structure encoding (endianness).
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try:
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# e_fmt: Format for the ELF header.
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# p_fmt: Format for a program header.
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# p_idx: Indexes to find p_type, p_offset, and p_filesz.
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e_fmt, self._p_fmt, self._p_idx = {
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(1, 1): ("<HHIIIIIHHH", "<IIIIIIII", (0, 1, 4)), # 32-bit LSB.
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(1, 2): (">HHIIIIIHHH", ">IIIIIIII", (0, 1, 4)), # 32-bit MSB.
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(2, 1): ("<HHIQQQIHHH", "<IIQQQQQQ", (0, 2, 5)), # 64-bit LSB.
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(2, 2): (">HHIQQQIHHH", ">IIQQQQQQ", (0, 2, 5)), # 64-bit MSB.
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}[(self.capacity, self.encoding)]
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except KeyError as e:
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raise ELFInvalid(
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f"unrecognized capacity ({self.capacity}) or encoding ({self.encoding})"
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) from e
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try:
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(
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_,
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self.machine, # Architecture type.
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_,
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_,
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self._e_phoff, # Offset of program header.
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_,
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self.flags, # Processor-specific flags.
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_,
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self._e_phentsize, # Size of a program header entry.
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self._e_phnum, # Number of program headers.
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) = self._read(e_fmt)
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except struct.error as e:
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raise ELFInvalid("unable to parse machine and section information") from e
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def _read(self, fmt: str) -> tuple[int, ...]:
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return struct.unpack(fmt, self._f.read(struct.calcsize(fmt)))
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@property
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def interpreter(self) -> str | None:
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"""
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The path recorded in the ``PT_INTERP`` section header.
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"""
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for index in range(self._e_phnum):
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self._f.seek(self._e_phoff + self._e_phentsize * index)
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try:
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data = self._read(self._p_fmt)
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except struct.error:
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continue
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if data[self._p_idx[0]] != 3: # Not PT_INTERP.
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continue
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self._f.seek(data[self._p_idx[1]])
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return os.fsdecode(self._f.read(data[self._p_idx[2]])).strip("\0")
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return None
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