From f29951c8990f0d31d1bacc27393ac88e3edf7e21 Mon Sep 17 00:00:00 2001
From: Vladimir Mihailenco <vladimir.webdev@gmail.com>
Date: Fri, 2 Jun 2017 16:19:43 +0300
Subject: [PATCH] Speedup ScanSlice

---
 internal/proto/scan.go |  2 +-
 internal/safe.go       |  4 ++++
 internal/unsafe.go     | 15 ++++++++++++++-
 3 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/internal/proto/scan.go b/internal/proto/scan.go
index a73a369..3ab40b9 100644
--- a/internal/proto/scan.go
+++ b/internal/proto/scan.go
@@ -122,7 +122,7 @@ func ScanSlice(data []string, slice interface{}) error {
 
 	for i, s := range data {
 		elem := internal.SliceNextElem(v)
-		if err := Scan([]byte(s), elem.Addr().Interface()); err != nil {
+		if err := Scan(internal.StringToBytes(s), elem.Addr().Interface()); err != nil {
 			return fmt.Errorf("redis: ScanSlice(index=%d value=%q) failed: %s", i, s, err)
 		}
 	}
diff --git a/internal/safe.go b/internal/safe.go
index dc5f4cc..870fe54 100644
--- a/internal/safe.go
+++ b/internal/safe.go
@@ -5,3 +5,7 @@ package internal
 func BytesToString(b []byte) string {
 	return string(b)
 }
+
+func StringToBytes(s string) []byte {
+	return []byte(s)
+}
diff --git a/internal/unsafe.go b/internal/unsafe.go
index 94e4a9d..c18b25c 100644
--- a/internal/unsafe.go
+++ b/internal/unsafe.go
@@ -9,6 +9,19 @@ import (
 
 func BytesToString(b []byte) string {
 	bytesHeader := (*reflect.SliceHeader)(unsafe.Pointer(&b))
-	strHeader := reflect.StringHeader{bytesHeader.Data, bytesHeader.Len}
+	strHeader := reflect.StringHeader{
+		Data: bytesHeader.Data,
+		Len:  bytesHeader.Len,
+	}
 	return *(*string)(unsafe.Pointer(&strHeader))
 }
+
+func StringToBytes(s string) []byte {
+	sh := (*reflect.StringHeader)(unsafe.Pointer(&s))
+	bh := reflect.SliceHeader{
+		Data: sh.Data,
+		Len:  sh.Len,
+		Cap:  sh.Len,
+	}
+	return *(*[]byte)(unsafe.Pointer(&bh))
+}