| """Verify a mirror against (possibly partial) chunks of the official ZIP release. |
| |
| Scans the official split-zip chunks for local file headers (PK\\x03\\x04), reads each entry's name, CRC-32 and |
| uncompressed size, and compares them with the same relative paths in the mirror directory. |
| |
| python scripts/verify_zip_mirror.py --chunks data/dl/ddr/DDR-dataset.zip.00[1-5] --mirror data/dl/ddr_hf \ |
| --strip-prefix DDR-dataset/ --only-prefix DR_grading/ --out data/bench/ddr_mirror_verification.csv |
| """ |
| import argparse |
| import struct |
| import zlib |
| from pathlib import Path |
|
|
| import pandas as pd |
|
|
| SIG = b"PK\x03\x04" |
|
|
|
|
| def local_headers(chunks): |
| """Yield (name, crc32, uncompressed_size) for every local header found in the concatenated chunks.""" |
| data = b"".join(Path(c).read_bytes() for c in chunks) |
| pos = data.find(SIG) |
| while pos != -1 and pos + 30 <= len(data): |
| flags, method, _, _, crc, csize, usize, nlen, xlen = struct.unpack("<HHHHIIIHH", data[pos + 6:pos + 30]) |
| name = data[pos + 30:pos + 30 + nlen].decode("utf-8", "replace") |
| if not flags & 0x08 and not name.endswith("/"): |
| yield name, crc, usize |
| pos = data.find(SIG, pos + 30 + nlen + xlen + (csize if not flags & 0x08 else 0)) |
|
|
|
|
| def crc32_file(p): |
| c = 0 |
| with open(p, "rb") as f: |
| while b := f.read(1 << 20): |
| c = zlib.crc32(b, c) |
| return c & 0xFFFFFFFF |
|
|
|
|
| def main(argv=None): |
| ap = argparse.ArgumentParser() |
| ap.add_argument("--chunks", nargs="+", required=True) |
| ap.add_argument("--mirror", required=True) |
| ap.add_argument("--strip-prefix", default="") |
| ap.add_argument("--only-prefix", default="") |
| ap.add_argument("--out", required=True) |
| a = ap.parse_args(argv) |
| rows = [] |
| for name, crc, usize in local_headers(sorted(a.chunks)): |
| rel = name[len(a.strip_prefix):] if name.startswith(a.strip_prefix) else name |
| if not rel.startswith(a.only_prefix): |
| continue |
| p = Path(a.mirror) / rel |
| if not p.is_file(): |
| rows.append([rel, "missing_in_mirror"]) |
| elif p.stat().st_size != usize: |
| rows.append([rel, "size_mismatch"]) |
| else: |
| rows.append([rel, "match" if crc32_file(p) == crc else "crc_mismatch"]) |
| df = pd.DataFrame(rows, columns=["path", "status"]) |
| df.to_csv(a.out, index=False) |
| print(df.status.value_counts().to_string()) |
|
|
|
|
| if __name__ == "__main__": |
| main() |
|
|
