github.com/xxRanger/go-ethereum@v1.8.23/common/bitutil/compress_fuzz.go (about)

     1  // Copyright 2017 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  // +build gofuzz
    18  
    19  package bitutil
    20  
    21  import "bytes"
    22  
    23  // Fuzz implements a go-fuzz fuzzer method to test various encoding method
    24  // invocations.
    25  func Fuzz(data []byte) int {
    26  	if len(data) == 0 {
    27  		return -1
    28  	}
    29  	if data[0]%2 == 0 {
    30  		return fuzzEncode(data[1:])
    31  	}
    32  	return fuzzDecode(data[1:])
    33  }
    34  
    35  // fuzzEncode implements a go-fuzz fuzzer method to test the bitset encoding and
    36  // decoding algorithm.
    37  func fuzzEncode(data []byte) int {
    38  	proc, _ := bitsetDecodeBytes(bitsetEncodeBytes(data), len(data))
    39  	if !bytes.Equal(data, proc) {
    40  		panic("content mismatch")
    41  	}
    42  	return 0
    43  }
    44  
    45  // fuzzDecode implements a go-fuzz fuzzer method to test the bit decoding and
    46  // reencoding algorithm.
    47  func fuzzDecode(data []byte) int {
    48  	blob, err := bitsetDecodeBytes(data, 1024)
    49  	if err != nil {
    50  		return 0
    51  	}
    52  	if comp := bitsetEncodeBytes(blob); !bytes.Equal(comp, data) {
    53  		panic("content mismatch")
    54  	}
    55  	return 0
    56  }