From 8c7b6199f720f3c67235888848e3a1d35efcd88f Mon Sep 17 00:00:00 2001
From: Felipe Zimmerle <fcosta@trustwave.com>
Date: Thu, 7 Jan 2016 09:16:06 -0300
Subject: [PATCH] Optimization on the tolower function

---
 src/assay.cc |  7 ++++---
 src/utils.cc | 10 ++++++----
 2 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/assay.cc b/src/assay.cc
index dae61909..1bcee838 100644
--- a/src/assay.cc
+++ b/src/assay.cc
@@ -433,12 +433,13 @@ int Assay::addRequestHeader(const std::string& key,
 
     this->m_collections.store("REQUEST_HEADERS:" + key, value);
 
-    if (tolower(key) == tolower("Authorization")) {
+    std::string keyl = tolower(key);
+    if (keyl == "authorization") {
         std::vector<std::string> type = split(value, ' ');
         this->m_collections.store("AUTH_TYPE", type[0]);
     }
 
-    if (tolower(key) == "cookie") {
+    if (keyl == "cookie") {
         std::vector<std::string> cookies = split(value, ';');
         while (cookies.empty() == false) {
             std::vector<std::string> s = split(cookies.back(), '=');
@@ -461,7 +462,7 @@ int Assay::addRequestHeader(const std::string& key,
      *
      */
 
-    if (tolower(key) == "content-type") {
+    if (keyl == "content-type") {
         std::string multipart("multipart/form-data");
         std::string l = tolower(value);
 
diff --git a/src/utils.cc b/src/utils.cc
index 21b89310..20842ade 100644
--- a/src/utils.cc
+++ b/src/utils.cc
@@ -25,7 +25,7 @@
 #include <stdint.h>
 #include <inttypes.h>
 
-
+#include <algorithm>
 #include <random>
 #include <memory>
 #include <functional>
@@ -126,10 +126,12 @@ void chomp(std::string *str) {
 std::string tolower(std::string str) {
     std::locale loc;
     std::string value;
+    value.resize(str.length());
 
-    for (std::string::size_type i=0; i < str.length(); ++i) {
-        value.assign(value + std::tolower(str[i], loc));
-    }
+    std::transform(str.begin(),
+            str.end(),
+            value.begin(),
+            ::tolower);
 
     return value;
 }