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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| // go-api - Client for the Cacophony API server. | ||
| // Copyright (C) 2018, The Cacophony Project | ||
| // | ||
| //Licensed under the Apache License, Version 2.0 (the "License"); | ||
| //you may not use this file except in compliance with the License. | ||
| //You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| //Unless required by applicable law or agreed to in writing, software | ||
| //distributed under the License is distributed on an "AS IS" BASIS, | ||
| //WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| //See the License for the specific language governing permissions and | ||
| //limitations under the License. | ||
|
|
||
| package api | ||
|
|
||
| import ( | ||
| "math/rand" | ||
| "time" | ||
| ) | ||
|
|
||
| const ( | ||
| chars = "abcdefghijklmnopqrstuvwxyz0123456789" | ||
| charIdxBits = 6 // 6 bits to represent a char index | ||
| charIdxMax = 63 / charIdxBits // # of char indices fitting in 63 bits | ||
| charIdxMask = 1<<charIdxBits - 1 // All 1-bits, as many as charIdxBits | ||
| ) | ||
|
|
||
| var randSrc = rand.NewSource(time.Now().UnixNano()) | ||
|
|
||
| func randString(n int) string { | ||
| b := make([]byte, n) | ||
| // A randSrc.Int63() generates 63 random bits, enough for charIdxMax characters! | ||
| for i, cache, remain := n-1, randSrc.Int63(), charIdxMax; i >= 0; { | ||
| if remain == 0 { | ||
| cache, remain = randSrc.Int63(), charIdxMax | ||
| } | ||
| if idx := int(cache & charIdxMask); idx < len(chars) { | ||
| b[i] = chars[idx] | ||
| i-- | ||
| } | ||
| cache >>= charIdxBits | ||
| remain-- | ||
| } | ||
| return string(b) | ||
| } |
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