| // Copyright (C) 2011 The Libphonenumber Authors |
| // |
| // 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 I18N_PHONENUMBERS_ENCODING_UTILS_H_ |
| #define I18N_PHONENUMBERS_ENCODING_UTILS_H_ |
| |
| #include "phonenumbers/base/basictypes.h" |
| #include "phonenumbers/utf/unilib.h" |
| #include "phonenumbers/utf/utf.h" |
| |
| namespace i18n { |
| namespace phonenumbers { |
| |
| class EncodingUtils { |
| public: |
| // Decodes one Unicode code-point value from a UTF-8 array. Returns the number |
| // of bytes read from the array. If the array does not contain valid UTF-8, |
| // the function stores 0xFFFD in the output variable and returns 1. |
| static inline int DecodeUTF8Char(const char* in, char32* out) { |
| Rune r; |
| int len = chartorune(&r, in); |
| *out = r; |
| return len; |
| } |
| |
| static const char* AdvanceOneUTF8Character(const char* buf_utf8) { |
| return buf_utf8 + UniLib::OneCharLen(buf_utf8); |
| } |
| |
| static const char* BackUpOneUTF8Character(const char* start, |
| const char* end) { |
| while (start < end && UniLib::IsTrailByte(*--end)) {} |
| return end; |
| } |
| }; |
| |
| } // namespace phonenumbers |
| } // namespace i18n |
| |
| #endif // I18N_PHONENUMBERS_ENCODING_UTILS_H_ |