tcpflow  1.6.1
About: tcpflow is a TCP/IP packet demultiplexer that captures data transmitted as part of TCP connections (flows), and stores the data in a way that is convenient for protocol analysis and debugging.
  Fossies Dox: tcpflow-1.6.1.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

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,
7 execute, and transmit the Software, and to prepare derivative works of the
8 Software, and to permit third-parties to whom the Software is furnished to
9 do so, all subject to the following:
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
15 works are solely in the form of machine-executable object code generated by
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
22 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
23 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24 DEALINGS IN THE SOFTWARE.
25 */
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  {
63  uint32_t cp = internal::mask8(*it);
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) + ((internal::mask8(*it) << 6) & 0xfff);
75  ++it;
76  cp += (*it) & 0x3f;
77  break;
78  case 4:
79  ++it;
80  cp = ((cp << 18) & 0x1fffff) + ((internal::mask8(*it) << 12) & 0x3ffff);
81  ++it;
82  cp += (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 next(it);
95  }
96 
97  template <typename octet_iterator>
98  uint32_t prior(octet_iterator& it)
99  {
100  while (internal::is_trail(*(--it))) ;
101  octet_iterator temp = it;
102  return 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 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)
116  next(it);
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  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 = internal::mask16(*start++);
134  // Take care of surrogate pairs first
135  if (internal::is_lead_surrogate(cp)) {
136  uint32_t trail_surrogate = internal::mask16(*start++);
137  cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
138  }
139  result = 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 = 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 = 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++) = 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 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  {
212  prior(it);
213  return *this;
214  }
216  {
217  iterator temp = *this;
218  prior(it);
219  return temp;
220  }
221  }; // class iterator
222 
223  } // namespace utf8::unchecked
224 } // namespace utf8
225 
226 
227 #endif // header guard
228 
iterator & operator++()
Definition: unchecked.h:199
iterator(const octet_iterator &octet_it)
Definition: unchecked.h:183
uint32_t operator*() const
Definition: unchecked.h:186
bool operator!=(const iterator &rhs) const
Definition: unchecked.h:195
octet_iterator base() const
Definition: unchecked.h:185
iterator & operator--()
Definition: unchecked.h:210
bool operator==(const iterator &rhs) const
Definition: unchecked.h:191
bool is_lead_surrogate(u16 cp)
Definition: core.h:75
const uint32_t SURROGATE_OFFSET
Definition: core.h:53
const uint16_t LEAD_OFFSET
Definition: core.h:52
const uint16_t TRAIL_SURROGATE_MIN
Definition: core.h:50
std::iterator_traits< octet_iterator >::difference_type sequence_length(octet_iterator lead_it)
Definition: core.h:100
uint16_t mask16(u16_type oc)
Definition: core.h:64
bool is_trail(octet_type oc)
Definition: core.h:69
uint8_t mask8(octet_type oc)
Definition: core.h:59
std::iterator_traits< octet_iterator >::difference_type distance(octet_iterator first, octet_iterator last)
Definition: unchecked.h:121
uint32_t previous(octet_iterator &it)
Definition: unchecked.h:107
void advance(octet_iterator &it, distance_type n)
Definition: unchecked.h:113
u32bit_iterator utf8to32(octet_iterator start, octet_iterator end, u32bit_iterator result)
Definition: unchecked.h:169
uint32_t peek_next(octet_iterator it)
Definition: unchecked.h:92
uint32_t next(octet_iterator &it)
Definition: unchecked.h:61
octet_iterator append(uint32_t cp, octet_iterator result)
Definition: unchecked.h:38
uint32_t prior(octet_iterator &it)
Definition: unchecked.h:98
octet_iterator utf16to8(u16bit_iterator start, u16bit_iterator end, octet_iterator result)
Definition: unchecked.h:130
u16bit_iterator utf8to16(octet_iterator start, octet_iterator end, u16bit_iterator result)
Definition: unchecked.h:145
octet_iterator utf32to8(u32bit_iterator start, u32bit_iterator end, octet_iterator result)
Definition: unchecked.h:160
Definition: checked.h:35
unsigned int uint32_t
Definition: core.h:40
unsigned char uint8_t
Definition: core.h:38
unsigned short uint16_t
Definition: core.h:39