forked from apache/pulsar-client-go
/
zstd_cgo.go
82 lines (67 loc) · 2.07 KB
/
zstd_cgo.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.
//go:build cgo
// +build cgo
// If CGO is enabled, use ZSTD library that links with official
// C based zstd which provides better performance compared with
// respect to the native Go implementation of ZStd.
package compression
import (
"github.com/DataDog/zstd"
log "github.com/sirupsen/logrus"
)
type zstdCGoProvider struct {
ctx zstd.Ctx
level Level
zstdLevel int
}
func newCGoZStdProvider(level Level) Provider {
z := &zstdCGoProvider{
ctx: zstd.NewCtx(),
}
switch level {
case Default:
z.zstdLevel = zstd.DefaultCompression
case Faster:
z.zstdLevel = zstd.BestSpeed
case Better:
z.zstdLevel = 9
}
return z
}
func NewZStdProvider(level Level) Provider {
return newCGoZStdProvider(level)
}
func (z *zstdCGoProvider) CompressMaxSize(originalSize int) int {
return zstd.CompressBound(originalSize)
}
func (z *zstdCGoProvider) Compress(dst, src []byte) []byte {
out, err := z.ctx.CompressLevel(dst, src, z.zstdLevel)
if err != nil {
log.WithError(err).Fatal("Failed to compress")
}
return out
}
func (z *zstdCGoProvider) Decompress(dst, src []byte, originalSize int) ([]byte, error) {
return z.ctx.Decompress(dst, src)
}
func (z *zstdCGoProvider) Close() error {
return nil
}
func (z *zstdCGoProvider) Clone() Provider {
return newCGoZStdProvider(z.level)
}