Function truncateAtValueBoundary

json_fuzz_test.go:571–583

truncateAtValueBoundary cuts the document right after a ':' (before the value starts). This is the OSS-Fuzz 4649128545288192 / sentinel_value_boundary class: the parser must not dereference past the cut when looking for the value token.

(r *rand.Rand, data []byte)

// sentinel_value_boundary class: the parser must not dereference past the
// cut when looking for the value token.
func truncateAtValueBoundary(r *rand.Rand, data []byte) []byte {
	pos := findStructuralBytes(data, ':')
	if len(pos) == 0 {
		return data
	}
	cut := pos[r.Intn(len(pos))] + 1
	if cut > len(data) {
		cut = len(data)
	}
	out := make([]byte, cut)
	copy(out, data[:cut])
	return out
}

// truncateMidKey cuts inside a string key. The cut is placed between the
// opening '"' of a key and its closing '"'. This is the truncated_mid_key