/usr/share/gocode/src/github.com/tendermint/go-common/test/mutate.go is in golang-github-tendermint-go-common-dev 0~20161202~0gitf40b1b6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | package test
import (
. "github.com/tendermint/go-common"
)
// Contract: !bytes.Equal(input, output) && len(input) >= len(output)
func MutateByteSlice(bytez []byte) []byte {
// If bytez is empty, panic
if len(bytez) == 0 {
panic("Cannot mutate an empty bytez")
}
// Copy bytez
mBytez := make([]byte, len(bytez))
copy(mBytez, bytez)
bytez = mBytez
// Try a random mutation
switch RandInt() % 2 {
case 0: // Mutate a single byte
bytez[RandInt()%len(bytez)] += byte(RandInt()%255 + 1)
case 1: // Remove an arbitrary byte
pos := RandInt() % len(bytez)
bytez = append(bytez[:pos], bytez[pos+1:]...)
}
return bytez
}
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