Upstream "nsurl_util.{h,mm}" from Chrome on iOS repository.

net/base/escape.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.
 
 #include "net/base/escape.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 300 matching lines @@
   0xffffffffL, 0xfc00987dL, 0x78000001L, 0xb8000001L,
   0xffffffffL, 0xffffffffL, 0xffffffffL, 0xffffffffL
 }};
 
 // non-printable, non-7bit, and (including space)  "#%:<>?[\]^`{|}
 static const Charmap kPathCharmap = {{
   0xffffffffL, 0xd400002dL, 0x78000000L, 0xb8000001L,
   0xffffffffL, 0xffffffffL, 0xffffffffL, 0xffffffffL
 }};
 
+// non-printable, non-7bit, and (including space)  "#%<>[\]^`{|}
+static const Charmap kNSURLCharmap = {{
+  0xffffffffL, 0x5000002dL, 0x78000000L, 0xb8000001L,
+  0xffffffffL, 0xffffffffL, 0xffffffffL, 0xffffffffL
+}};
+
 // non-printable, non-7bit, and (including space) ?>=<;+'&%$#"![\]^`{|}
 static const Charmap kUrlEscape = {{
   0xffffffffL, 0xf80008fdL, 0x78000001L, 0xb8000001L,
   0xffffffffL, 0xffffffffL, 0xffffffffL, 0xffffffffL
 }};
 
 // non-7bit
 static const Charmap kNonASCIICharmap = {{
   0x00000000L, 0x00000000L, 0x00000000L, 0x00000000L,
   0xffffffffL, 0xffffffffL, 0xffffffffL, 0xffffffffL
 }};
 
 // Everything except alphanumerics, the reserved characters(;/?:@&=+$,) and
 // !'()*-._~#[]
 static const Charmap kExternalHandlerCharmap = {{
   0xffffffffL, 0x50000025L, 0x50000000L, 0xb8000001L,
   0xffffffffL, 0xffffffffL, 0xffffffffL, 0xffffffffL
 }};
 
 }  // namespace
 
 std::string EscapeQueryParamValue(const std::string& text, bool use_plus) {
   return Escape(text, kQueryCharmap, use_plus);
 }
 
 std::string EscapePath(const std::string& path) {
   return Escape(path, kPathCharmap, false);
 }
 
+std::string EscapeNSURLPrecursor(const std::string& precursor) {
+  return Escape(precursor, kNSURLCharmap, false, true);
+}
+
 std::string EscapeUrlEncodedData(const std::string& path, bool use_plus) {
   return Escape(path, kUrlEscape, use_plus);
 }
 
 std::string EscapeNonASCII(const std::string& input) {
   return Escape(input, kNonASCIICharmap, false);
 }
 
 std::string EscapeExternalHandlerValue(const std::string& text) {
   return Escape(text, kExternalHandlerCharmap, false, true);
@@ skipping 80 matching lines @@
                        1, kEscapeToChars[i].replacement);
           break;
         }
       }
     }
   }
   return text;
 }
 
 }  // namespace net