forked from cerc-io/plugeth
71 lines
2.1 KiB
Go
71 lines
2.1 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package bitutil
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import (
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"bytes"
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"github.com/ethereum/go-ethereum/common/bitutil"
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)
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// Fuzz implements a go-fuzz fuzzer method to test various encoding method
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// invocations.
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func Fuzz(data []byte) int {
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if len(data) == 0 {
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return 0
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}
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if data[0]%2 == 0 {
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return fuzzEncode(data[1:])
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}
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return fuzzDecode(data[1:])
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}
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// fuzzEncode implements a go-fuzz fuzzer method to test the bitset encoding and
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// decoding algorithm.
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func fuzzEncode(data []byte) int {
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proc, _ := bitutil.DecompressBytes(bitutil.CompressBytes(data), len(data))
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if !bytes.Equal(data, proc) {
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panic("content mismatch")
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}
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return 1
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}
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// fuzzDecode implements a go-fuzz fuzzer method to test the bit decoding and
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// reencoding algorithm.
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func fuzzDecode(data []byte) int {
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blob, err := bitutil.DecompressBytes(data, 1024)
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if err != nil {
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return 0
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}
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// re-compress it (it's OK if the re-compressed differs from the
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// original - the first input may not have been compressed at all)
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comp := bitutil.CompressBytes(blob)
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if len(comp) > len(blob) {
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// After compression, it must be smaller or equal
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panic("bad compression")
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}
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// But decompressing it once again should work
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decomp, err := bitutil.DecompressBytes(data, 1024)
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if err != nil {
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panic(err)
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}
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if !bytes.Equal(decomp, blob) {
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panic("content mismatch")
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}
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return 1
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}
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