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35 lines
1.1 KiB
Go
35 lines
1.1 KiB
Go
// Copyright 2021 The LevelDB-Go and Pebble Authors. All rights reserved. Use
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// of this source code is governed by a BSD-style license that can be found in
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// the LICENSE file.
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//go:build cgo
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// +build cgo
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package sstable
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import (
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"bytes"
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"github.com/DataDog/zstd"
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)
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// decodeZstd decompresses b with the Zstandard algorithm.
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// It reuses the preallocated capacity of decodedBuf if it is sufficient.
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// On success, it returns the decoded byte slice.
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func decodeZstd(decodedBuf, b []byte) ([]byte, error) {
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return zstd.Decompress(decodedBuf, b)
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}
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// encodeZstd compresses b with the Zstandard algorithm at default compression
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// level (level 3). It reuses the preallocated capacity of compressedBuf if it
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// is sufficient. The subslice `compressedBuf[:varIntLen]` should already encode
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// the length of `b` before calling encodeZstd. It returns the encoded byte
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// slice, including the `compressedBuf[:varIntLen]` prefix.
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func encodeZstd(compressedBuf []byte, varIntLen int, b []byte) []byte {
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buf := bytes.NewBuffer(compressedBuf[:varIntLen])
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writer := zstd.NewWriterLevel(buf, 3)
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writer.Write(b)
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writer.Close()
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return buf.Bytes()
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}
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