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feat(zstd): backport replacement of DataDog's zstd with Klauspost's zstd
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| /* | ||
| * Copyright 2019 Dgraph Labs, Inc. and Contributors | ||
| * | ||
| * 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 | ||
| * | ||
| * 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 y | ||
|
|
||
| import ( | ||
| "sync" | ||
|
|
||
| "github.com/klauspost/compress/zstd" | ||
| ) | ||
|
|
||
| var ( | ||
| decoder *zstd.Decoder | ||
| encoder *zstd.Encoder | ||
|
|
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| encOnce, decOnce sync.Once | ||
| ) | ||
|
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| // ZSTDDecompress decompresses a block using ZSTD algorithm. | ||
| func ZSTDDecompress(dst, src []byte) ([]byte, error) { | ||
| decOnce.Do(func() { | ||
| var err error | ||
| decoder, err = zstd.NewReader(nil) | ||
| Check(err) | ||
| }) | ||
| return decoder.DecodeAll(src, dst[:0]) | ||
| } | ||
|
|
||
| // ZSTDCompress compresses a block using ZSTD algorithm. | ||
| func ZSTDCompress(dst, src []byte, compressionLevel int) ([]byte, error) { | ||
| encOnce.Do(func() { | ||
| var err error | ||
| level := zstd.EncoderLevelFromZstd(compressionLevel) | ||
| encoder, err = zstd.NewWriter(nil, zstd.WithEncoderLevel(level)) | ||
| Check(err) | ||
| }) | ||
| return encoder.EncodeAll(src, dst[:0]), nil | ||
| } | ||
|
|
||
| // ZSTDCompressBound returns the worst case size needed for a destination buffer. | ||
| // Klauspost ZSTD library does not provide any API for Compression Bound. This | ||
| // calculation is based on the DataDog ZSTD library. | ||
| // See https://pkg.go.dev/github.com/DataDog/zstd#CompressBound | ||
| func ZSTDCompressBound(srcSize int) int { | ||
| lowLimit := 128 << 10 // 128 kB | ||
| var margin int | ||
| if srcSize < lowLimit { | ||
| margin = (lowLimit - srcSize) >> 11 | ||
| } | ||
| return srcSize + (srcSize >> 8) + margin | ||
| } |
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