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29 lines
688 B
29 lines
688 B
// nolint:gosec // G404: Use of weak random number generator
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package test
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import (
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mrand "math/rand"
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)
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// Contract: !bytes.Equal(input, output) && len(input) >= len(output)
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func MutateByteSlice(bytez []byte) []byte {
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// If bytez is empty, panic
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if len(bytez) == 0 {
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panic("Cannot mutate an empty bytez")
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}
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// Copy bytez
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mBytez := make([]byte, len(bytez))
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copy(mBytez, bytez)
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bytez = mBytez
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// Try a random mutation
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switch mrand.Int() % 2 {
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case 0: // Mutate a single byte
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bytez[mrand.Int()%len(bytez)] += byte(mrand.Int()%255 + 1)
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case 1: // Remove an arbitrary byte
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pos := mrand.Int() % len(bytez)
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bytez = append(bytez[:pos], bytez[pos+1:]...)
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}
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return bytez
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}
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