mirror of
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128 lines
3.0 KiB
Go
128 lines
3.0 KiB
Go
/*
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* Minio Cloud Storage, (C) 2018 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package parquet
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"sync"
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"github.com/klauspost/compress/gzip"
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"github.com/klauspost/compress/snappy"
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"github.com/klauspost/compress/zstd"
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"github.com/minio/minio/pkg/s3select/internal/parquet-go/gen-go/parquet"
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"github.com/pierrec/lz4"
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)
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type compressionCodec parquet.CompressionCodec
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var zstdOnce sync.Once
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var zstdEnc *zstd.Encoder
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var zstdDec *zstd.Decoder
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func initZstd() {
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zstdOnce.Do(func() {
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zstdEnc, _ = zstd.NewWriter(nil, zstd.WithZeroFrames(true))
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zstdDec, _ = zstd.NewReader(nil)
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})
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}
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func (c compressionCodec) compress(buf []byte) ([]byte, error) {
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switch parquet.CompressionCodec(c) {
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case parquet.CompressionCodec_UNCOMPRESSED:
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return buf, nil
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case parquet.CompressionCodec_SNAPPY:
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return snappy.Encode(nil, buf), nil
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case parquet.CompressionCodec_GZIP:
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byteBuf := new(bytes.Buffer)
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writer := gzip.NewWriter(byteBuf)
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n, err := writer.Write(buf)
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if err != nil {
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return nil, err
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}
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if n != len(buf) {
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return nil, fmt.Errorf("short writes")
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}
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if err = writer.Flush(); err != nil {
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return nil, err
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}
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if err = writer.Close(); err != nil {
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return nil, err
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}
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return byteBuf.Bytes(), nil
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case parquet.CompressionCodec_LZ4:
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byteBuf := new(bytes.Buffer)
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writer := lz4.NewWriter(byteBuf)
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n, err := writer.Write(buf)
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if err != nil {
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return nil, err
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}
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if n != len(buf) {
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return nil, fmt.Errorf("short writes")
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}
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if err = writer.Flush(); err != nil {
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return nil, err
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}
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if err = writer.Close(); err != nil {
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return nil, err
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}
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return byteBuf.Bytes(), nil
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case parquet.CompressionCodec_ZSTD:
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initZstd()
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return zstdEnc.EncodeAll(buf, nil), nil
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}
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return nil, fmt.Errorf("invalid compression codec %v", c)
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}
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func (c compressionCodec) uncompress(buf []byte) ([]byte, error) {
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switch parquet.CompressionCodec(c) {
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case parquet.CompressionCodec_UNCOMPRESSED:
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return buf, nil
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case parquet.CompressionCodec_SNAPPY:
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return snappy.Decode(nil, buf)
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case parquet.CompressionCodec_GZIP:
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reader, err := gzip.NewReader(bytes.NewReader(buf))
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if err != nil {
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return nil, err
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}
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defer reader.Close()
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return ioutil.ReadAll(reader)
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case parquet.CompressionCodec_LZ4:
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return ioutil.ReadAll(lz4.NewReader(bytes.NewReader(buf)))
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case parquet.CompressionCodec_ZSTD:
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initZstd()
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return zstdDec.DecodeAll(buf, nil)
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}
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return nil, fmt.Errorf("invalid compression codec %v", c)
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}
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