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

net/http/http_response_headers.cc

 // Copyright (c) 2012 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.
 
 // The rules for header parsing were borrowed from Firefox:
 // http://lxr.mozilla.org/seamonkey/source/netwerk/protocol/http/src/nsHttpResponseHead.cpp
 // The rules for parsing content-types were also borrowed from Firefox:
 // http://lxr.mozilla.org/mozilla/source/netwerk/base/src/nsURLHelper.cpp#834
 
 #include "net/http/http_response_headers.h"
@@ skipping 637 matching lines @@
 
   std::string::const_iterator dot = std::find(p, line_end, '.');
   if (dot == line_end) {
     DVLOG(1) << "malformed version";
     return HttpVersion();
   }
 
   ++p;  // from / to first digit.
   ++dot;  // from . to second digit.
 
-  if (!(*p >= '0' && *p <= '9' && *dot >= '0' && *dot <= '9')) {
+  if (!(base::IsAsciiDigit(*p) && base::IsAsciiDigit(*dot))) {
     DVLOG(1) << "malformed version number";
     return HttpVersion();
   }
 
   uint16_t major = *p - '0';
   uint16_t minor = *dot - '0';
 
   return HttpVersion(major, minor);
 }
 
@@ skipping 34 matching lines @@
     raw_headers_.append(" 200 OK");
     response_code_ = 200;
     return;
   }
 
   // Skip whitespace.
   while (p < line_end && *p == ' ')
     ++p;
 
   std::string::const_iterator code = p;
-  while (p < line_end && *p >= '0' && *p <= '9')
+  while (p < line_end && base::IsAsciiDigit(*p))
     ++p;
 
   if (p == code) {
     DVLOG(1) << "missing response status number; assuming 200";
     raw_headers_.append(" 200");
     response_code_ = 200;
     return;
   }
   raw_headers_.push_back(' ');
   raw_headers_.append(code, p);
@@ skipping 740 matching lines @@
   return true;
 }
 
 bool HttpResponseHeaders::IsChunkEncoded() const {
   // Ignore spurious chunked responses from HTTP/1.0 servers and proxies.
   return GetHttpVersion() >= HttpVersion(1, 1) &&
       HasHeaderValue("Transfer-Encoding", "chunked");
 }
 
 }  // namespace net