runtime/utf-inl.h

/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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 ART_RUNTIME_UTF_INL_H_
#define ART_RUNTIME_UTF_INL_H_

#include "utf.h"

namespace art {

inline uint16_t GetUtf16FromUtf8(const char** utf8_data_in) {
  uint8_t one = *(*utf8_data_in)++;
  if ((one & 0x80) == 0) {
    // one-byte encoding
    return one;
  }
  // two- or three-byte encoding
  uint8_t two = *(*utf8_data_in)++;
  if ((one & 0x20) == 0) {
    // two-byte encoding
    return ((one & 0x1f) << 6) | (two & 0x3f);
  }
  // three-byte encoding
  uint8_t three = *(*utf8_data_in)++;
  return ((one & 0x0f) << 12) | ((two & 0x3f) << 6) | (three & 0x3f);
}

inline int CompareModifiedUtf8ToModifiedUtf8AsUtf16CodePointValues(const char* utf8_1,
                                                                   const char* utf8_2) {
  for (;;) {
    if (*utf8_1 == '\0') {
      return (*utf8_2 == '\0') ? 0 : -1;
    } else if (*utf8_2 == '\0') {
      return 1;
    }

    int c1 = GetUtf16FromUtf8(&utf8_1);
    int c2 = GetUtf16FromUtf8(&utf8_2);

    if (c1 != c2) {
      return c1 > c2 ? 1 : -1;
    }
  }
}

}  // namespace art

#endif  // ART_RUNTIME_UTF_INL_H_