You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
31 lines
644 B
31 lines
644 B
package testutil |
|
|
|
import ( |
|
"encoding/binary" |
|
"math/rand" |
|
) |
|
|
|
// ZeroRand is zero random source. |
|
type ZeroRand struct{} |
|
|
|
// Read implements io.Reader. |
|
func (ZeroRand) Read(p []byte) (n int, err error) { return len(p), nil } |
|
|
|
func randSeed(data []byte) int64 { |
|
if len(data) == 0 { |
|
return 0 |
|
} |
|
|
|
seedBuf := make([]byte, 64/8) |
|
copy(seedBuf, data) |
|
|
|
return int64(binary.BigEndian.Uint64(seedBuf)) |
|
} |
|
|
|
// Rand returns a new rand.Rand with source deterministically initialized |
|
// from seed byte slice. |
|
// |
|
// Zero length seed (or nil) is valid input. |
|
func Rand(seed []byte) *rand.Rand { |
|
return rand.New(rand.NewSource(randSeed(seed))) // #nosec |
|
}
|
|
|