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unchecked.h
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1 // Copyright 2006 Nemanja Trifunovic
2 
3 /*
4 Permission is hereby granted, free of charge, to any person or organization
5 obtaining a copy of the software and accompanying documentation covered by
6 this license (the "Software") to use, reproduce, display, distribute,
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10 
11 The copyright notices in the Software and this entire statement, including
12 the above license grant, this restriction and the following disclaimer,
13 must be included in all copies of the Software, in whole or in part, and
14 all derivative works of the Software, unless such copies or derivative
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16 a source language processor.
17 
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
21 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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26 
27 
28 #ifndef UTF8_FOR_CPP_UNCHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
29 #define UTF8_FOR_CPP_UNCHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
30 
31 #include "core.h"
32 
33 namespace utf8
34 {
35  namespace unchecked
36  {
37  template <typename octet_iterator>
38  octet_iterator append(uint32_t cp, octet_iterator result)
39  {
40  if (cp < 0x80) // one octet
41  *(result++) = static_cast<uint8_t>(cp);
42  else if (cp < 0x800) { // two octets
43  *(result++) = static_cast<uint8_t>((cp >> 6) | 0xc0);
44  *(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
45  }
46  else if (cp < 0x10000) { // three octets
47  *(result++) = static_cast<uint8_t>((cp >> 12) | 0xe0);
48  *(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f) | 0x80);
49  *(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
50  }
51  else { // four octets
52  *(result++) = static_cast<uint8_t>((cp >> 18) | 0xf0);
53  *(result++) = static_cast<uint8_t>(((cp >> 12) & 0x3f)| 0x80);
54  *(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f) | 0x80);
55  *(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
56  }
57  return result;
58  }
59 
60  template <typename octet_iterator>
61  uint32_t next(octet_iterator& it)
62  {
64  typename std::iterator_traits<octet_iterator>::difference_type length = utf8::internal::sequence_length(it);
65  switch (length) {
66  case 1:
67  break;
68  case 2:
69  it++;
70  cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);
71  break;
72  case 3:
73  ++it;
74  cp = ((cp << 12) & 0xffff) + ((utf8::internal::mask8(*it) << 6) & 0xfff);
75  ++it;
76  cp += (*it) & 0x3f;
77  break;
78  case 4:
79  ++it;
80  cp = ((cp << 18) & 0x1fffff) + ((utf8::internal::mask8(*it) << 12) & 0x3ffff);
81  ++it;
82  cp += (utf8::internal::mask8(*it) << 6) & 0xfff;
83  ++it;
84  cp += (*it) & 0x3f;
85  break;
86  }
87  ++it;
88  return cp;
89  }
90 
91  template <typename octet_iterator>
92  uint32_t peek_next(octet_iterator it)
93  {
94  return utf8::unchecked::next(it);
95  }
96 
97  template <typename octet_iterator>
98  uint32_t prior(octet_iterator& it)
99  {
100  while (utf8::internal::is_trail(*(--it))) ;
101  octet_iterator temp = it;
102  return utf8::unchecked::next(temp);
103  }
104 
105  // Deprecated in versions that include prior, but only for the sake of consistency (see utf8::previous)
106  template <typename octet_iterator>
107  inline uint32_t previous(octet_iterator& it)
108  {
109  return utf8::unchecked::prior(it);
110  }
111 
112  template <typename octet_iterator, typename distance_type>
113  void advance (octet_iterator& it, distance_type n)
114  {
115  for (distance_type i = 0; i < n; ++i)
117  }
118 
119  template <typename octet_iterator>
120  typename std::iterator_traits<octet_iterator>::difference_type
121  distance (octet_iterator first, octet_iterator last)
122  {
123  typename std::iterator_traits<octet_iterator>::difference_type dist;
124  for (dist = 0; first < last; ++dist)
125  utf8::unchecked::next(first);
126  return dist;
127  }
128 
129  template <typename u16bit_iterator, typename octet_iterator>
130  octet_iterator utf16to8 (u16bit_iterator start, u16bit_iterator end, octet_iterator result)
131  {
132  while (start != end) {
133  uint32_t cp = utf8::internal::mask16(*start++);
134  // Take care of surrogate pairs first
136  uint32_t trail_surrogate = utf8::internal::mask16(*start++);
137  cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
138  }
139  result = utf8::unchecked::append(cp, result);
140  }
141  return result;
142  }
143 
144  template <typename u16bit_iterator, typename octet_iterator>
145  u16bit_iterator utf8to16 (octet_iterator start, octet_iterator end, u16bit_iterator result)
146  {
147  while (start < end) {
148  uint32_t cp = utf8::unchecked::next(start);
149  if (cp > 0xffff) { //make a surrogate pair
150  *result++ = static_cast<uint16_t>((cp >> 10) + internal::LEAD_OFFSET);
151  *result++ = static_cast<uint16_t>((cp & 0x3ff) + internal::TRAIL_SURROGATE_MIN);
152  }
153  else
154  *result++ = static_cast<uint16_t>(cp);
155  }
156  return result;
157  }
158 
159  template <typename octet_iterator, typename u32bit_iterator>
160  octet_iterator utf32to8 (u32bit_iterator start, u32bit_iterator end, octet_iterator result)
161  {
162  while (start != end)
163  result = utf8::unchecked::append(*(start++), result);
164 
165  return result;
166  }
167 
168  template <typename octet_iterator, typename u32bit_iterator>
169  u32bit_iterator utf8to32 (octet_iterator start, octet_iterator end, u32bit_iterator result)
170  {
171  while (start < end)
172  (*result++) = utf8::unchecked::next(start);
173 
174  return result;
175  }
176 
177  // The iterator class
178  template <typename octet_iterator>
179  class iterator : public std::iterator <std::bidirectional_iterator_tag, uint32_t> {
180  octet_iterator it;
181  public:
182  iterator () {}
183  explicit iterator (const octet_iterator& octet_it): it(octet_it) {}
184  // the default "big three" are OK
185  octet_iterator base () const { return it; }
187  {
188  octet_iterator temp = it;
189  return utf8::unchecked::next(temp);
190  }
191  bool operator == (const iterator& rhs) const
192  {
193  return (it == rhs.it);
194  }
195  bool operator != (const iterator& rhs) const
196  {
197  return !(operator == (rhs));
198  }
200  {
202  return *this;
203  }
205  {
206  iterator temp = *this;
208  return temp;
209  }
211  {
213  return *this;
214  }
216  {
217  iterator temp = *this;
219  return temp;
220  }
221  }; // class iterator
222 
223  } // namespace utf8::unchecked
224 } // namespace utf8
225 
226 
227 #endif // header guard
228 
Definition: unchecked.h:179
octet_iterator append(uint32_t cp, octet_iterator result)
Definition: unchecked.h:38
std::iterator_traits< octet_iterator >::difference_type sequence_length(octet_iterator lead_it)
Definition: core.h:100
octet_iterator it
Definition: unchecked.h:180
const uint16_t TRAIL_SURROGATE_MIN
Definition: core.h:50
u32bit_iterator utf8to32(octet_iterator start, octet_iterator end, u32bit_iterator result)
Definition: unchecked.h:169
bool operator!=(const iterator &rhs) const
Definition: unchecked.h:195
uint32_t peek_next(octet_iterator it)
Definition: unchecked.h:92
iterator & operator++()
Definition: unchecked.h:199
std::iterator_traits< octet_iterator >::difference_type distance(octet_iterator first, octet_iterator last)
Definition: unchecked.h:121
iterator()
Definition: unchecked.h:182
uint32_t next(octet_iterator &it)
Definition: unchecked.h:61
octet_iterator utf32to8(u32bit_iterator start, u32bit_iterator end, octet_iterator result)
Definition: unchecked.h:160
bool is_lead_surrogate(u16 cp)
Definition: core.h:75
u16bit_iterator utf8to16(octet_iterator start, octet_iterator end, u16bit_iterator result)
Definition: unchecked.h:145
iterator & operator--()
Definition: unchecked.h:210
uint32_t previous(octet_iterator &it)
Definition: unchecked.h:107
uint8_t mask8(octet_type oc)
Definition: core.h:59
octet_iterator base() const
Definition: unchecked.h:185
iterator(const octet_iterator &octet_it)
Definition: unchecked.h:183
const uint32_t SURROGATE_OFFSET
Definition: core.h:53
bool operator==(const iterator &rhs) const
Definition: unchecked.h:191
octet_iterator utf16to8(u16bit_iterator start, u16bit_iterator end, octet_iterator result)
Definition: unchecked.h:130
uint16_t mask16(u16_type oc)
Definition: core.h:64
unsigned short uint16_t
Definition: core.h:39
Definition: checked.h:34
float length(float v)
Definition: vectorMath.h:208
void advance(octet_iterator &it, distance_type n)
Definition: unchecked.h:113
unsigned int uint32_t
Definition: core.h:40
bool is_trail(octet_type oc)
Definition: core.h:69
const uint16_t LEAD_OFFSET
Definition: core.h:52
uint32_t prior(octet_iterator &it)
Definition: unchecked.h:98
uint32_t operator*() const
Definition: unchecked.h:186