pyiceberg/avro/codecs/deflate.py

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from __future__ import annotations

import zlib

from pyiceberg.avro.codecs.codec import Codec


class DeflateCodec(Codec):
    @staticmethod
    def compress(data: bytes) -> tuple[bytes, int]:
        # The first two characters and last character are zlib
        # wrappers around deflate data.
        compressed_data = zlib.compress(data)[2:-1]
        return compressed_data, len(compressed_data)

    @staticmethod
    def decompress(data: bytes) -> bytes:
        # -15 is the log of the window size; negative indicates
        # "raw" (no zlib headers) decompression.  See zlib.h.
        return zlib.decompress(data, -15)