github.com/core-coin/go-core/v2@v2.1.9/common/bitutil/compress_fuzz.go (about)

     1  // Copyright 2017 by the Authors
     2  // This file is part of the go-core library.
     3  //
     4  // The go-core 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-core 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-core library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  //go:build gofuzz
    18  // +build gofuzz
    19  
    20  package bitutil
    21  
    22  import "bytes"
    23  
    24  // Fuzz implements a go-fuzz fuzzer method to test various encoding method
    25  // invocations.
    26  func Fuzz(data []byte) int {
    27  	if len(data) == 0 {
    28  		return 0
    29  	}
    30  	if data[0]%2 == 0 {
    31  		return fuzzEncode(data[1:])
    32  	}
    33  	return fuzzDecode(data[1:])
    34  }
    35  
    36  // fuzzEncode implements a go-fuzz fuzzer method to test the bitset encoding and
    37  // decoding algorithm.
    38  func fuzzEncode(data []byte) int {
    39  	proc, _ := bitsetDecodeBytes(bitsetEncodeBytes(data), len(data))
    40  	if !bytes.Equal(data, proc) {
    41  		panic("content mismatch")
    42  	}
    43  	return 1
    44  }
    45  
    46  // fuzzDecode implements a go-fuzz fuzzer method to test the bit decoding and
    47  // reencoding algorithm.
    48  func fuzzDecode(data []byte) int {
    49  	blob, err := bitsetDecodeBytes(data, 1024)
    50  	if err != nil {
    51  		return 0
    52  	}
    53  	if comp := bitsetEncodeBytes(blob); !bytes.Equal(comp, data) {
    54  		panic("content mismatch")
    55  	}
    56  	return 1
    57  }