70 lines
1.9 KiB
Python
70 lines
1.9 KiB
Python
# core/archive.py
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import os
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import zipfile
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import rarfile
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import shutil
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class ArchiveError(Exception):
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pass
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def detect_real_format(path: str) -> str | None:
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"""Devuelve 'zip', 'rar' o None según los magic bytes del archivo."""
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try:
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zipfile.ZipFile(path).close()
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return "zip"
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except Exception:
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pass
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try:
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rarfile.RarFile(path).close()
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return "rar"
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except Exception:
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pass
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return None
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def open_archive(path: str):
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"""Devuelve un ZipFile o RarFile abierto en modo lectura."""
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fmt = detect_real_format(path)
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if fmt == "zip":
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return zipfile.ZipFile(path, "r")
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if fmt == "rar":
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return rarfile.RarFile(path, "r")
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raise ArchiveError(f"Formato desconocido o archivo corrupto: {path}")
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def extract_archive(path: str, dest_dir: str) -> str:
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"""Extrae el archivo en dest_dir. Devuelve dest_dir."""
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archive = open_archive(path)
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try:
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archive.extractall(dest_dir)
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finally:
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archive.close()
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return dest_dir
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def repack_as_cbz(source_dir: str, target_path: str) -> None:
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"""Empaqueta todos los archivos de source_dir en un CBZ (ZIP deflated).
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Escribe primero a un fichero temporal (.tmp) en el mismo directorio y
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hace un os.replace() atómico al final, de modo que una interrupción
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nunca deja un CBZ parcial ni destruye el original.
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"""
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tmp_path = target_path + ".tmp"
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try:
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with zipfile.ZipFile(tmp_path, "w", zipfile.ZIP_DEFLATED) as zf:
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for root, _, files in os.walk(source_dir):
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for f in files:
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full = os.path.join(root, f)
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rel = os.path.relpath(full, source_dir)
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zf.write(full, rel)
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os.replace(tmp_path, target_path)
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except BaseException:
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if os.path.exists(tmp_path):
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os.remove(tmp_path)
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raise
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