#!/usr/bin/env python3
"""Verify exact companion payload bytes with the Python standard library."""
from pathlib import Path
import hashlib,json,sys

root=Path(__file__).resolve().parent
manifest=json.loads((root/'MANIFEST.json').read_text())
errors=[]
for name,entry in manifest['files'].items():
    p=root/name
    if not p.is_file():errors.append('Missing: '+name);continue
    data=p.read_bytes()
    if len(data)!=entry['bytes'] or hashlib.sha256(data).hexdigest()!=entry['sha256']:
        errors.append('Changed: '+name)
print(json.dumps({'status':'FAIL' if errors else 'PASS','payloads_checked':len(manifest['files']),'errors':errors},indent=2))
sys.exit(bool(errors))