github.com/vicanso/pike@v1.0.1-0.20210630235453-9099e041f6ec/compress/zstd.go (about)

     1  // MIT License
     2  
     3  // Copyright (c) 2020 Tree Xie
     4  
     5  // Permission is hereby granted, free of charge, to any person obtaining a copy
     6  // of this software and associated documentation files (the "Software"), to deal
     7  // in the Software without restriction, including without limitation the rights
     8  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     9  // copies of the Software, and to permit persons to whom the Software is
    10  // furnished to do so, subject to the following conditions:
    11  
    12  // The above copyright notice and this permission notice shall be included in all
    13  // copies or substantial portions of the Software.
    14  
    15  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    16  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    17  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    18  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    19  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    20  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    21  // SOFTWARE.
    22  
    23  package compress
    24  
    25  import (
    26  	"github.com/klauspost/compress/zstd"
    27  )
    28  
    29  func doZSTDEncode(data []byte, level int) ([]byte, error) {
    30  	l := zstd.EncoderLevel(level)
    31  	if l < zstd.SpeedFastest || l > zstd.SpeedBestCompression {
    32  		l = zstd.SpeedDefault
    33  	}
    34  	encoder, err := zstd.NewWriter(nil, zstd.WithEncoderLevel(l))
    35  	if err != nil {
    36  		return nil, err
    37  	}
    38  	return encoder.EncodeAll(data, make([]byte, 0, len(data))), nil
    39  }
    40  
    41  func doZSTDDecode(buf []byte) ([]byte, error) {
    42  	decoder, err := zstd.NewReader(nil)
    43  	if err != nil {
    44  		return nil, err
    45  	}
    46  	return decoder.DecodeAll(buf, nil)
    47  }