| // 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 compression |
| |
| import ( |
| "bytes" |
| "github.com/klauspost/compress/zstd" |
| "github.com/pkg/errors" |
| ) |
| |
| type zstdProvider struct { |
| encoder *zstd.Encoder |
| } |
| |
| func NewZStdProvider() Provider { |
| p := &zstdProvider{} |
| p.encoder, _ = zstd.NewWriter(nil) |
| return p |
| } |
| |
| func (p *zstdProvider) CanCompress() bool { |
| return true |
| } |
| |
| func (p *zstdProvider) Compress(data []byte) []byte { |
| return p.encoder.EncodeAll(data, []byte{}) |
| } |
| |
| func (p* zstdProvider) Decompress(compressedData []byte, originalSize int) ([]byte, error) { |
| d, err := zstd.NewReader(bytes.NewReader(compressedData)) |
| if err != nil { |
| return nil, err |
| } |
| |
| uncompressed := make([]byte, originalSize) |
| size, err := d.Read(uncompressed) |
| if err != nil { |
| return nil, err |
| } else if size != originalSize { |
| return nil, errors.New("Invalid uncompressed size") |
| } else { |
| return uncompressed, nil |
| } |
| } |