Implement IsAsciiUpper and IsAsciiLower in base/strings/string_util.h

net/cert/internal/verify_name_match.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/cert/internal/verify_name_match.h"
 
+#include "base/strings/string_util.h"
 #include "base/tuple.h"
 #include "net/cert/internal/parse_name.h"
 #include "net/der/input.h"
 #include "net/der/parser.h"
 #include "net/der/tag.h"
 
 namespace net {
 
 namespace {
 
@@ skipping 55 matching lines @@
 
   for (; read_iter != output->end(); ++read_iter) {
     const unsigned char c = *read_iter;
     if (c == ' ') {
       // If there are non-whitespace characters remaining in input, compress
       // multiple whitespace chars to a single space, otherwise ignore trailing
       // whitespace.
       std::string::const_iterator next_iter = read_iter + 1;
       if (next_iter != output->end() && *next_iter != ' ')
         *(write_iter++) = ' ';
-    } else if (c >= 'A' && c <= 'Z') {
+    } else if (base::IsAsciiUpper(c)) {
       // Fold case.
       *(write_iter++) = c + ('a' - 'A');
     } else {
       // Note that these checks depend on the characters allowed by earlier
       // conditions also being valid for the enforced charset.
       switch (charset_enforcement) {
         case ENFORCE_PRINTABLE_STRING:
           // See NormalizePrintableStringValue comment for the acceptable list
           // of characters.
-          if (!((c >= 'a' && c <= 'z') || (c >= '\'' && c <= ':') || c == '=' ||
+          if (!(base::IsAsciiLower(c) || (c >= '\'' && c <= ':') || c == '=' ||
                 c == '?'))
             return false;
           break;
         case ENFORCE_ASCII:
           if (c > 0x7F)
             return false;
           break;
         case NO_ENFORCEMENT:
           break;
       }
@@ skipping 209 matching lines @@
         return true;
       }
     }
   }
 
   *contained_email_address = false;
   return true;
 }
 
 }  // namespace net