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_elffile.py

"""
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
"""

import enum
import os
import struct
from typing import IO, Optional, Tuple

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:
            raise ELFInvalid("unable to parse identification")
        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:
            raise ELFInvalid(
                f"unrecognized capacity ({self.capacity}) or "
                f"encoding ({self.encoding})"
            )

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) -> Optional[str]:
        """
        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

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/linksafe	0755	2025-01-15 08:11:29
..	dir	-	root/linksafe	0755	2025-01-15 08:11:29
__pycache__	dir	-	root/linksafe	0755	2025-01-15 08:11:29
__init__.py	text/plain	501 B	root/linksafe	0644	2024-12-01 12:53:25
_elffile.py	text/plain	3.19 KB	root/linksafe	0644	2024-12-01 12:53:25
_manylinux.py	text/x-script.python	8.72 KB	root/linksafe	0644	2024-12-01 12:53:25
_musllinux.py	text/plain	2.46 KB	root/linksafe	0644	2024-12-01 12:53:25
_parser.py	text/plain	9.96 KB	root/linksafe	0644	2024-12-01 12:53:25
_structures.py	text/x-script.python	1.4 KB	root/linksafe	0644	2024-12-01 12:53:25
_tokenizer.py	text/x-script.python	5.17 KB	root/linksafe	0644	2024-12-01 12:53:25
markers.py	text/x-script.python	8.02 KB	root/linksafe	0644	2024-12-01 12:53:25
metadata.py	text/x-script.python	16.01 KB	root/linksafe	0644	2024-12-01 12:53:25
py.typed	application/x-empty	0 B	root/linksafe	0644	2024-12-01 12:53:25
requirements.py	text/x-script.python	3.21 KB	root/linksafe	0644	2024-12-01 12:53:25
specifiers.py	text/x-script.python	38.29 KB	root/linksafe	0644	2024-12-01 12:53:25
tags.py	text/x-script.python	17.68 KB	root/linksafe	0644	2024-12-01 12:53:25
utils.py	text/x-script.python	4.25 KB	root/linksafe	0644	2024-12-01 12:53:25
version.py	text/x-script.python	15.94 KB	root/linksafe	0644	2024-12-01 12:53:25

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