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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 
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20 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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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 
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
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
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
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