pyiceberg/avro/codecs/zstandard_codec.py

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# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
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from __future__ import annotations

from io import BytesIO

from pyiceberg.avro.codecs.codec import Codec

try:
    from zstandard import ZstdCompressor, ZstdDecompressor

    class ZStandardCodec(Codec):
        @staticmethod
        def compress(data: bytes) -> tuple[bytes, int]:
            compressed_data = ZstdCompressor().compress(data)
            return compressed_data, len(compressed_data)

        @staticmethod
        def decompress(data: bytes) -> bytes:
            uncompressed = bytearray()
            dctx = ZstdDecompressor()
            with dctx.stream_reader(BytesIO(data)) as reader:
                while True:
                    chunk = reader.read(16384)
                    if not chunk:
                        break
                    uncompressed.extend(chunk)
            return uncompressed

except ImportError:

    class ZStandardCodec(Codec):  # type: ignore
        @staticmethod
        def compress(data: bytes) -> tuple[bytes, int]:
            raise ImportError("Zstandard support not installed, please install using `pip install pyiceberg[zstandard]`")

        @staticmethod
        def decompress(data: bytes) -> bytes:
            raise ImportError("Zstandard support not installed, please install using `pip install pyiceberg[zstandard]`")