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compression.go
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compression.go
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/*
* 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.
*/
package util
import (
"strings"
"github.com/klauspost/compress/zstd"
)
// BytesCompression is an interface of algorithm for compressing bytes.
type BytesCompression interface {
Compress([]byte) ([]byte, error)
Decompress([]byte) ([]byte, error)
// String returns name of the algorithm.
String() string
}
// NewCompression returns nil if the given name is invalid.
func NewCompression(name string) BytesCompression {
name = strings.ToLower(name)
switch name {
case "zstd":
return newZstdCompression()
default:
return nil
}
}
type zstdCompression struct {
encoder *zstd.Encoder
decoder *zstd.Decoder
}
func (z *zstdCompression) Compress(data []byte) ([]byte, error) {
return z.encoder.EncodeAll(data, make([]byte, 0, len(data))), nil
}
func (z *zstdCompression) Decompress(data []byte) ([]byte, error) {
return z.decoder.DecodeAll(data, nil)
}
func (z *zstdCompression) String() string {
return "zstd"
}
func newZstdCompression() BytesCompression {
decoder, _ := zstd.NewReader(nil)
encoder, _ := zstd.NewWriter(nil)
return &zstdCompression{
encoder: encoder,
decoder: decoder,
}
}