| /** |
| * Copyright 2010 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| #ifndef STRINGS_ESCAPING_H_ |
| #define STRINGS_ESCAPING_H_ |
| |
| #include "base/logging.h" |
| |
| namespace strings { |
| |
| inline int hex_digit_to_int(char c) { |
| /* Assume ASCII. */ |
| DCHECK('0' == 0x30 && 'A' == 0x41 && 'a' == 0x61); |
| DCHECK(isxdigit(c)); |
| int x = static_cast<unsigned char>(c); |
| if (x > '9') { |
| x += 9; |
| } |
| return x & 0xf; |
| } |
| |
| } // namespace strings |
| |
| #endif // STRINGS_ESCAPING_H_ |
