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zstd.go
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zstd.go
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//
// Copyright (C) 2019-2022 vdaas.org vald team <vald@vdaas.org>
//
// Licensed 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
//
// https://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 zstd
import (
"github.com/klauspost/compress/zstd"
"github.com/vdaas/vald/internal/io"
)
type (
// EOption is type alias of zstd.EOption.
EOption = zstd.EOption
// DOption is type alias of zstd.DOption.
DOption = zstd.DOption
)
// Encoder represents an interface for Encoder of zstd.
type Encoder interface {
io.WriteCloser
ReadFrom(r io.Reader) (n int64, err error)
}
// Decoder represents an interface for Decoder of zstd.
type Decoder interface {
io.Reader
Close()
WriteTo(w io.Writer) (int64, error)
}
// Zstd is an interface to create Writer and Reader implementation.
type Zstd interface {
NewWriter(w io.Writer, opts ...EOption) (Encoder, error)
NewReader(r io.Reader, opts ...DOption) (Decoder, error)
}
type compress struct{}
// New returns Zstd implementation.
func New() Zstd {
return new(compress)
}
// NewWriter returns Encoder implementation.
func (*compress) NewWriter(w io.Writer, opts ...EOption) (Encoder, error) {
return zstd.NewWriter(w, opts...)
}
// NewReader returns Decoder implementation.
func (*compress) NewReader(r io.Reader, opts ...DOption) (Decoder, error) {
return zstd.NewReader(r, opts...)
}