| # Licensed to the Apache Software Foundation (ASF) under one | |
| # or more contributor license agreements. See the NOTICE file | |
| # distributed with this work for additional information | |
| # regarding copyright ownership. The ASF licenses this file | |
| # to you under the Apache License, Version 2.0 (the | |
| # "License"); you may not use this file except in compliance | |
| # with the License. You may obtain a copy of the License at | |
| # | |
| # http://www.apache.org/licenses/LICENSE-2.0 | |
| # | |
| # Unless required by applicable law or agreed to in writing, | |
| # software distributed under the License is distributed on an | |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
| # KIND, either express or implied. See the License for the | |
| # specific language governing permissions and limitations | |
| # under the License. | |
| from __future__ import annotations | |
| import zlib | |
| from pyiceberg.avro.codecs.codec import Codec | |
| class DeflateCodec(Codec): | |
| 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) | |
| 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) | |