add some comments for captcha

2014-01-16 21:34:59 +08:00
parent f419c12427
commit 91cbe1f29b
2 changed files with 80 additions and 10 deletions
--- a/utils/captcha/image.go
+++ b/utils/captcha/image.go
@@ -1,3 +1,4 @@
+// modifiy and integrated to Beego from https://github.com/dchest/captcha
 package captcha

 import (
@@ -240,10 +241,16 @@ func getrand() *rand.Rand {
 }

 func randIntn(max int) int {
+	if max <= 0 {
+		return 0
+	}
 	return getrand().Intn(max)
 }

 func randInt(min, max int) int {
+	if max-min <= 0 {
+		return 0
+	}
 	return getrand().Intn(max-min) + min
 }