Return nonnegative hash if int is 32 bits
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@ -11,9 +11,12 @@ import (
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// and invert it if the result is negative.
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func String(s string) int {
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v := int(crc32.ChecksumIEEE([]byte(s)))
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if v < 0 {
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if v >= 0 {
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return v
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}
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if -v >= 0 {
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return -v
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}
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return v
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// v == MinInt
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return 0
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}
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@ -16,7 +16,8 @@ func TestString(t *testing.T) {
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}
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func TestString_positiveIndex(t *testing.T) {
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ips := []string{"192.168.1.3", "192.168.1.5"}
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// "2338615298" hashes to uint32(2147483648) which is math.MinInt32
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ips := []string{"192.168.1.3", "192.168.1.5", "2338615298"}
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for _, ip := range ips {
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if index := String(ip); index < 0 {
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t.Fatalf("Bad Index %#v for ip %s", index, ip)
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