utf.cc revision cc2f2393e69a9b1425bad1a89f41aaaf8c38f9e2 
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
24namespace art {
25
26size_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
47void 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
53void 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
71int32_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
80int32_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
88int32_t ComputeUtf8Hash(const char* chars) {
89  int32_t hash = 0;
90  while (*chars != '\0') {
91    hash = hash * 31 + GetUtf16FromUtf8(&chars);
92  }
93  return hash;
94}
95
96int 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
113size_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