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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 #include "utf.h"
     18 
     19 #include "base/logging.h"
     20 #include "mirror/array.h"
     21 #include "mirror/object-inl.h"
     22 #include "utf-inl.h"
     23 
     24 namespace art {
     25 
     26 size_t CountModifiedUtf8Chars(const char* utf8) {
     27   size_t len = 0;
     28   int ic;
     29   while ((ic = *utf8++) != '\0') {
     30     len++;
     31     if ((ic & 0x80) == 0) {
     32       // one-byte encoding
     33       continue;
     34     }
     35     // two- or three-byte encoding
     36     utf8++;
     37     if ((ic & 0x20) == 0) {
     38       // two-byte encoding
     39       continue;
     40     }
     41     // three-byte encoding
     42     utf8++;
     43   }
     44   return len;
     45 }
     46 
     47 void ConvertModifiedUtf8ToUtf16(uint16_t* utf16_data_out, const char* utf8_data_in) {
     48   while (*utf8_data_in != '\0') {
     49     *utf16_data_out++ = GetUtf16FromUtf8(&utf8_data_in);
     50   }
     51 }
     52 
     53 void ConvertUtf16ToModifiedUtf8(char* utf8_out, const uint16_t* utf16_in, size_t char_count) {
     54   while (char_count--) {
     55     uint16_t ch = *utf16_in++;
     56     if (ch > 0 && ch <= 0x7f) {
     57       *utf8_out++ = ch;
     58     } else {
     59       if (ch > 0x07ff) {
     60         *utf8_out++ = (ch >> 12) | 0xe0;
     61         *utf8_out++ = ((ch >> 6) & 0x3f) | 0x80;
     62         *utf8_out++ = (ch & 0x3f) | 0x80;
     63       } else /*(ch > 0x7f || ch == 0)*/ {
     64         *utf8_out++ = (ch >> 6) | 0xc0;
     65         *utf8_out++ = (ch & 0x3f) | 0x80;
     66       }
     67     }
     68   }
     69 }
     70 
     71 int32_t ComputeUtf16Hash(mirror::CharArray* chars, int32_t offset,
     72                          size_t char_count) {
     73   int32_t hash = 0;
     74   for (size_t i = 0; i < char_count; i++) {
     75     hash = hash * 31 + chars->Get(offset + i);
     76   }
     77   return hash;
     78 }
     79 
     80 int32_t ComputeUtf16Hash(const uint16_t* chars, size_t char_count) {
     81   int32_t hash = 0;
     82   while (char_count--) {
     83     hash = hash * 31 + *chars++;
     84   }
     85   return hash;
     86 }
     87 
     88 size_t ComputeModifiedUtf8Hash(const char* chars) {
     89   size_t hash = 0;
     90   while (*chars != '\0') {
     91     hash = hash * 31 + *chars++;
     92   }
     93   return hash;
     94 }
     95 
     96 int CompareModifiedUtf8ToUtf16AsCodePointValues(const char* utf8_1, const uint16_t* utf8_2) {
     97   for (;;) {
     98     if (*utf8_1 == '\0') {
     99       return (*utf8_2 == '\0') ? 0 : -1;
    100     } else if (*utf8_2 == '\0') {
    101       return 1;
    102     }
    103 
    104     int c1 = GetUtf16FromUtf8(&utf8_1);
    105     int c2 = *utf8_2;
    106 
    107     if (c1 != c2) {
    108       return c1 > c2 ? 1 : -1;
    109     }
    110   }
    111 }
    112 
    113 size_t CountUtf8Bytes(const uint16_t* chars, size_t char_count) {
    114   size_t result = 0;
    115   while (char_count--) {
    116     uint16_t ch = *chars++;
    117     if (ch > 0 && ch <= 0x7f) {
    118       ++result;
    119     } else {
    120       if (ch > 0x7ff) {
    121         result += 3;
    122       } else {
    123         result += 2;
    124       }
    125     }
    126   }
    127   return result;
    128 }
    129 
    130 }  // namespace art
    131