| // Copyright (c) HashiCorp, Inc. |
| // SPDX-License-Identifier: MPL-2.0 |
| |
| package hashcode |
| |
| import ( |
| "bytes" |
| "fmt" |
| "hash/crc32" |
| ) |
| |
| // String hashes a string to a unique hashcode. |
| // |
| // crc32 returns a uint32, but for our use we need |
| // a non negative integer. Here we cast to an integer |
| // and invert it if the result is negative. |
| func String(s string) int { |
| v := int(crc32.ChecksumIEEE([]byte(s))) |
| if v >= 0 { |
| return v |
| } |
| if -v >= 0 { |
| return -v |
| } |
| // v == MinInt |
| return 0 |
| } |
| |
| // Strings hashes a list of strings to a unique hashcode. |
| func Strings(strings []string) string { |
| var buf bytes.Buffer |
| |
| for _, s := range strings { |
| buf.WriteString(fmt.Sprintf("%s-", s)) |
| } |
| |
| return fmt.Sprintf("%d", String(buf.String())) |
| } |
