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https://github.com/minio/minio.git
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129 lines
3.1 KiB
Go
129 lines
3.1 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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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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