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Member "tcpflow-1.6.1/src/be13_api/utf8/unchecked.h" (19 Feb 2021, 8640 Bytes) of package /linux/misc/tcpflow-1.6.1.tar.gz:


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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; }
  186             uint32_t operator * () const
  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             }
  199             iterator& operator ++ () 
  200             {
  201                 std::advance(it, internal::sequence_length(it));
  202                 return *this;
  203             }
  204             iterator operator ++ (int)
  205             {
  206                 iterator temp = *this;
  207                 std::advance(it, internal::sequence_length(it));
  208                 return temp;
  209             }  
  210             iterator& operator -- ()
  211             {
  212                 prior(it);
  213                 return *this;
  214             }
  215             iterator operator -- (int)
  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