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Return nonnegative hash if int is 32 bits

This commit is contained in:
David Tolnay 2016-07-01 14:40:07 -07:00
parent 3b732131d2
commit 7096e4d3da
2 changed files with 8 additions and 4 deletions
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9
helper/hashcode/hashcode.go
View File

@ -11,9 +11,12 @@ import (
// and invert it if the result is negative.
func String(s string) int {
v := int(crc32.ChecksumIEEE([]byte(s)))
if v < 0 {
if v >= 0 {
return v
}
if -v >= 0 {
return -v
}
return v
// v == MinInt
return 0
}

3
helper/hashcode/hashcode_test.go
View File

@ -16,7 +16,8 @@ func TestString(t *testing.T) {
}
func TestString_positiveIndex(t *testing.T) {
ips := []string{"192.168.1.3", "192.168.1.5"}
// "2338615298" hashes to uint32(2147483648) which is math.MinInt32
ips := []string{"192.168.1.3", "192.168.1.5", "2338615298"}
for _, ip := range ips {
if index := String(ip); index < 0 {
t.Fatalf("Bad Index %#v for ip %s", index, ip)