net/url: add upperhex const instead of using string literal

The mime and strconv packages already have a const with this name & value.

Change-Id: Ibd7837f854ac8ec3f57943a9d1db07f4cf6db858
GitHub-Last-Rev: 775cdce3b75350aa3b9a6f31f04cfdd0033e9ac3
GitHub-Pull-Request: golang/go#34389
Reviewed-on: https://go-review.googlesource.com/c/go/+/196437
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/net/url/url.go b/src/net/url/url.go
index bd706eac84aab72265cb0e7c558c1854be45a5c5..6f4d5a1ce773437333cbeb17865afaa000b3c65e 100644 (file)
--- a/src/net/url/url.go
+++ b/src/net/url/url.go
@@ -42,6 +42,8 @@ func (e *Error) Temporary() bool {
        return ok && t.Temporary()
 }
 
+const upperhex = "0123456789ABCDEF"
+
 func ishex(c byte) bool {
        switch {
        case '0' <= c && c <= '9':
@@ -324,8 +326,8 @@ func escape(s string, mode encoding) string {
                        j++
                case shouldEscape(c, mode):
                        t[j] = '%'
-                       t[j+1] = "0123456789ABCDEF"[c>>4]
-                       t[j+2] = "0123456789ABCDEF"[c&15]
+                       t[j+1] = upperhex[c>>4]
+                       t[j+2] = upperhex[c&15]
                        j += 3
                default:
                        t[j] = s[i]