github.com/matrixorigin/matrixone@v1.2.0/pkg/compress/compress.go (about)

     1  // Copyright 2021 Matrix Origin
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package compress
    16  
    17  import (
    18  	"github.com/pierrec/lz4/v4"
    19  )
    20  
    21  var Algorithms map[string]int = map[string]int{
    22  	"lz4":  Lz4,
    23  	"none": None,
    24  }
    25  
    26  func Compress(src, dst []byte, typ int) ([]byte, error) {
    27  	switch typ {
    28  	case Lz4:
    29  		n, err := lz4.CompressBlock(src, dst, nil)
    30  		if err != nil {
    31  			return nil, err
    32  		}
    33  		return dst[:n], nil
    34  	}
    35  	return nil, nil
    36  }
    37  
    38  func Decompress(src, dst []byte, typ int) ([]byte, error) {
    39  	switch typ {
    40  	case Lz4:
    41  		n, err := lz4.UncompressBlock(src, dst)
    42  		if err != nil {
    43  			return nil, err
    44  		}
    45  		return dst[:n], nil
    46  	}
    47  	return nil, nil
    48  }