FM / packaging

/opt/imh-python/lib/python3.9/site-packages/packaging/

/opt/imh-python/lib/python3.9/site-packages/packaging

Name	Size	Mode	Actions
licenses/	-	0755	rm
__pycache__/	-	0755	rm
markers.py	12049	0644	edit dl rm
metadata.py	34739	0644	edit dl rm
py.typed	0	0644	edit dl rm
requirements.py	2947	0644	edit dl rm
specifiers.py	40055	0644	edit dl rm
tags.py	22745	0644	edit dl rm
utils.py	5050	0644	edit dl rm
version.py	16676	0644	edit dl rm
_elffile.py	3286	0644	edit dl rm
_manylinux.py	9596	0644	edit dl rm
_musllinux.py	2694	0644	edit dl rm
_parser.py	10221	0644	edit dl rm
_structures.py	1431	0644	edit dl rm
_tokenizer.py	5310	0644	edit dl rm
__init__.py	494	0644	edit dl rm

Edit: /opt/imh-python/lib/python3.9/site-packages/packaging/_elffile.py (3286B)

"""
ELF file parser.

This provides a class ``ELFFile`` that parses an ELF executable in a similar
interface to ``ZipFile``. Only the read interface is implemented.

Based on: https://gist.github.com/lyssdod/f51579ae8d93c8657a5564aefc2ffbca
ELF header: https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.eheader.html
"""

from __future__ import annotations

import enum
import os
import struct
from typing import IO

class ELFInvalid(ValueError):
    pass

class EIClass(enum.IntEnum):
    C32 = 1
    C64 = 2

class EIData(enum.IntEnum):
    Lsb = 1
    Msb = 2

class EMachine(enum.IntEnum):
    I386 = 3
    S390 = 22
    Arm = 40
    X8664 = 62
    AArc64 = 183

class ELFFile:
    """
    Representation of an ELF executable.
    """

def __init__(self, f: IO[bytes]) -> None:
        self._f = f

try:
            ident = self._read("16B")
        except struct.error as e:
            raise ELFInvalid("unable to parse identification") from e
        magic = bytes(ident[:4])
        if magic != b"\x7fELF":
            raise ELFInvalid(f"invalid magic: {magic!r}")

self.capacity = ident[4]  # Format for program header (bitness).
        self.encoding = ident[5]  # Data structure encoding (endianness).

try:
            # e_fmt: Format for program header.
            # p_fmt: Format for section header.
            # p_idx: Indexes to find p_type, p_offset, and p_filesz.
            e_fmt, self._p_fmt, self._p_idx = {
                (1, 1): ("<HHIIIIIHHH", "<IIIIIIII", (0, 1, 4)),  # 32-bit LSB.
                (1, 2): (">HHIIIIIHHH", ">IIIIIIII", (0, 1, 4)),  # 32-bit MSB.
                (2, 1): ("<HHIQQQIHHH", "<IIQQQQQQ", (0, 2, 5)),  # 64-bit LSB.
                (2, 2): (">HHIQQQIHHH", ">IIQQQQQQ", (0, 2, 5)),  # 64-bit MSB.
            }[(self.capacity, self.encoding)]
        except KeyError as e:
            raise ELFInvalid(
                f"unrecognized capacity ({self.capacity}) or encoding ({self.encoding})"
            ) from e

try:
            (
                _,
                self.machine,  # Architecture type.
                _,
                _,
                self._e_phoff,  # Offset of program header.
                _,
                self.flags,  # Processor-specific flags.
                _,
                self._e_phentsize,  # Size of section.
                self._e_phnum,  # Number of sections.
            ) = self._read(e_fmt)
        except struct.error as e:
            raise ELFInvalid("unable to parse machine and section information") from e

def _read(self, fmt: str) -> tuple[int, ...]:
        return struct.unpack(fmt, self._f.read(struct.calcsize(fmt)))

@property
    def interpreter(self) -> str | None:
        """
        The path recorded in the ``PT_INTERP`` section header.
        """
        for index in range(self._e_phnum):
            self._f.seek(self._e_phoff + self._e_phentsize * index)
            try:
                data = self._read(self._p_fmt)
            except struct.error:
                continue
            if data[self._p_idx[0]] != 3:  # Not PT_INTERP.
                continue
            self._f.seek(data[self._p_idx[1]])
            return os.fsdecode(self._f.read(data[self._p_idx[2]])).strip("\0")
        return None

cmd: