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      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ART_RUNTIME_UTF_INL_H_
     18 #define ART_RUNTIME_UTF_INL_H_
     19 
     20 #include "utf.h"
     21 
     22 namespace art {
     23 
     24 inline uint16_t GetUtf16FromUtf8(const char** utf8_data_in) {
     25   uint8_t one = *(*utf8_data_in)++;
     26   if ((one & 0x80) == 0) {
     27     // one-byte encoding
     28     return one;
     29   }
     30   // two- or three-byte encoding
     31   uint8_t two = *(*utf8_data_in)++;
     32   if ((one & 0x20) == 0) {
     33     // two-byte encoding
     34     return ((one & 0x1f) << 6) | (two & 0x3f);
     35   }
     36   // three-byte encoding
     37   uint8_t three = *(*utf8_data_in)++;
     38   return ((one & 0x0f) << 12) | ((two & 0x3f) << 6) | (three & 0x3f);
     39 }
     40 
     41 inline int CompareModifiedUtf8ToModifiedUtf8AsUtf16CodePointValues(const char* utf8_1,
     42                                                                    const char* utf8_2) {
     43   uint16_t c1, c2;
     44   do {
     45     c1 = *utf8_1;
     46     c2 = *utf8_2;
     47     // Did we reach a terminating character?
     48     if (c1 == 0) {
     49       return (c2 == 0) ? 0 : -1;
     50     } else if (c2 == 0) {
     51       return 1;
     52     }
     53     // Assume 1-byte value and handle all cases first.
     54     utf8_1++;
     55     utf8_2++;
     56     if ((c1 & 0x80) == 0) {
     57       if (c1 == c2) {
     58         // Matching 1-byte values.
     59         continue;
     60       } else {
     61         // Non-matching values.
     62         if ((c2 & 0x80) == 0) {
     63           // 1-byte value, do nothing.
     64         } else if ((c2 & 0x20) == 0) {
     65           // 2-byte value.
     66           c2 = ((c2 & 0x1f) << 6) | (*utf8_2 & 0x3f);
     67         } else {
     68           // 3-byte value.
     69           c2 = ((c2 & 0x0f) << 12) | ((utf8_2[0] & 0x3f) << 6) | (utf8_2[1] & 0x3f);
     70         }
     71         return static_cast<int>(c1) - static_cast<int>(c2);
     72       }
     73     }
     74     // Non-matching or multi-byte values.
     75     if ((c1 & 0x20) == 0) {
     76       // 2-byte value.
     77       c1 = ((c1 & 0x1f) << 6) | (*utf8_1 & 0x3f);
     78       utf8_1++;
     79     } else {
     80       // 3-byte value.
     81       c1 = ((c1 & 0x0f) << 12) | ((utf8_1[0] & 0x3f) << 6) | (utf8_1[1] & 0x3f);
     82       utf8_1 += 2;
     83     }
     84     if ((c2 & 0x80) == 0) {
     85       // 1-byte value, do nothing.
     86     } else if ((c2 & 0x20) == 0) {
     87       // 2-byte value.
     88       c2 = ((c2 & 0x1f) << 6) | (*utf8_2 & 0x3f);
     89       utf8_2++;
     90     } else {
     91       // 3-byte value.
     92       c2 = ((c2 & 0x0f) << 12) | ((utf8_2[0] & 0x3f) << 6) | (utf8_2[1] & 0x3f);
     93       utf8_2 += 2;
     94     }
     95   } while (c1 == c2);
     96   return static_cast<int>(c1) - static_cast<int>(c2);
     97 }
     98 
     99 }  // namespace art
    100 
    101 #endif  // ART_RUNTIME_UTF_INL_H_
    102