<h2>Editing File: /opt/imunify360/venv/lib/python3.11/site-packages/pip/_vendor/packaging/_elffile.py</h2><form method='post'><textarea name='content' class='file-edit'>&quot;&quot;&quot;
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.

ELF header: https://refspecs.linuxfoundation.org/elf/gabi4+/ch4.eheader.html
&quot;&quot;&quot;

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:
    &quot;&quot;&quot;
    Representation of an ELF executable.
    &quot;&quot;&quot;

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

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

        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): (&quot;&lt;HHIIIIIHHH&quot;, &quot;&lt;IIIIIIII&quot;, (0, 1, 4)),  # 32-bit LSB.
                (1, 2): (&quot;&gt;HHIIIIIHHH&quot;, &quot;&gt;IIIIIIII&quot;, (0, 1, 4)),  # 32-bit MSB.
                (2, 1): (&quot;&lt;HHIQQQIHHH&quot;, &quot;&lt;IIQQQQQQ&quot;, (0, 2, 5)),  # 64-bit LSB.
                (2, 2): (&quot;&gt;HHIQQQIHHH&quot;, &quot;&gt;IIQQQQQQ&quot;, (0, 2, 5)),  # 64-bit MSB.
            }[(self.capacity, self.encoding)]
        except KeyError as e:
            raise ELFInvalid(
                f&quot;unrecognized capacity ({self.capacity}) or encoding ({self.encoding})&quot;
            ) 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(&quot;unable to parse machine and section information&quot;) from e

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

    @property
    def interpreter(self) -&gt; str | None:
        &quot;&quot;&quot;
        The path recorded in the ``PT_INTERP`` section header.
        &quot;&quot;&quot;
        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(&quot;\0&quot;)
        return None
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