40 lines
1 KiB
Go
40 lines
1 KiB
Go
package network
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import (
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"encoding/binary"
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"errors"
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"github.com/nspcc-dev/neo-go/pkg/network/payload"
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"github.com/pierrec/lz4"
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)
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// compress compresses bytes using lz4.
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func compress(source []byte) ([]byte, error) {
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dest := make([]byte, 4+lz4.CompressBlockBound(len(source)))
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size, err := lz4.CompressBlock(source, dest[4:], nil)
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if err != nil {
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return nil, err
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}
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binary.LittleEndian.PutUint32(dest[:4], uint32(len(source)))
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return dest[:size+4], nil
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}
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// decompress decompresses bytes using lz4.
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func decompress(source []byte) ([]byte, error) {
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if len(source) < 4 {
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return nil, errors.New("invalid compressed payload")
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}
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length := binary.LittleEndian.Uint32(source[:4])
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if length > payload.MaxSize {
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return nil, errors.New("invalid uncompressed payload length")
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}
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dest := make([]byte, length)
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size, err := lz4.UncompressBlock(source[4:], dest)
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if err != nil {
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return nil, err
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}
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if uint32(size) != length {
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return nil, errors.New("decompressed payload size doesn't match header")
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}
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return dest, nil
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}
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