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-rw-r--r--lib/utfcpp/v4/source/utf8/checked.h359
-rw-r--r--lib/utfcpp/v4/source/utf8/core.h492
-rw-r--r--lib/utfcpp/v4/source/utf8/cpp11.h70
-rw-r--r--lib/utfcpp/v4/source/utf8/cpp17.h96
-rw-r--r--lib/utfcpp/v4/source/utf8/cpp20.h124
-rw-r--r--lib/utfcpp/v4/source/utf8/unchecked.h287
6 files changed, 1428 insertions, 0 deletions
diff --git a/lib/utfcpp/v4/source/utf8/checked.h b/lib/utfcpp/v4/source/utf8/checked.h
new file mode 100644
index 00000000..98949f8b
--- /dev/null
+++ b/lib/utfcpp/v4/source/utf8/checked.h
@@ -0,0 +1,359 @@
+// Copyright 2006-2016 Nemanja Trifunovic
+
+/*
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+
+#ifndef UTF8_FOR_CPP_CHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
+#define UTF8_FOR_CPP_CHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
+
+#include "core.h"
+#include <stdexcept>
+
+namespace utf8
+{
+ // Base for the exceptions that may be thrown from the library
+ class exception : public ::std::exception {
+ };
+
+ // Exceptions that may be thrown from the library functions.
+ class invalid_code_point : public exception {
+ utfchar32_t cp;
+ public:
+ invalid_code_point(utfchar32_t codepoint) : cp(codepoint) {}
+ virtual const char* what() const UTF_CPP_NOEXCEPT UTF_CPP_OVERRIDE { return "Invalid code point"; }
+ utfchar32_t code_point() const {return cp;}
+ };
+
+ class invalid_utf8 : public exception {
+ utfchar8_t u8;
+ public:
+ invalid_utf8 (utfchar8_t u) : u8(u) {}
+ invalid_utf8 (char c) : u8(static_cast<utfchar8_t>(c)) {}
+ virtual const char* what() const UTF_CPP_NOEXCEPT UTF_CPP_OVERRIDE { return "Invalid UTF-8"; }
+ utfchar8_t utf8_octet() const {return u8;}
+ };
+
+ class invalid_utf16 : public exception {
+ utfchar16_t u16;
+ public:
+ invalid_utf16 (utfchar16_t u) : u16(u) {}
+ virtual const char* what() const UTF_CPP_NOEXCEPT UTF_CPP_OVERRIDE { return "Invalid UTF-16"; }
+ utfchar16_t utf16_word() const {return u16;}
+ };
+
+ class not_enough_room : public exception {
+ public:
+ virtual const char* what() const UTF_CPP_NOEXCEPT UTF_CPP_OVERRIDE { return "Not enough space"; }
+ };
+
+ /// The library API - functions intended to be called by the users
+
+ template <typename octet_iterator>
+ octet_iterator append(utfchar32_t cp, octet_iterator result)
+ {
+ if (!utf8::internal::is_code_point_valid(cp))
+ throw invalid_code_point(cp);
+
+ return internal::append(cp, result);
+ }
+
+ inline void append(utfchar32_t cp, std::string& s)
+ {
+ append(cp, std::back_inserter(s));
+ }
+
+ template <typename word_iterator>
+ word_iterator append16(utfchar32_t cp, word_iterator result)
+ {
+ if (!utf8::internal::is_code_point_valid(cp))
+ throw invalid_code_point(cp);
+
+ return internal::append16(cp, result);
+ }
+
+ template <typename octet_iterator, typename output_iterator>
+ output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out, utfchar32_t replacement)
+ {
+ while (start != end) {
+ octet_iterator sequence_start = start;
+ internal::utf_error err_code = utf8::internal::validate_next(start, end);
+ switch (err_code) {
+ case internal::UTF8_OK :
+ for (octet_iterator it = sequence_start; it != start; ++it)
+ *out++ = *it;
+ break;
+ case internal::NOT_ENOUGH_ROOM:
+ out = utf8::append (replacement, out);
+ start = end;
+ break;
+ case internal::INVALID_LEAD:
+ out = utf8::append (replacement, out);
+ ++start;
+ break;
+ case internal::INCOMPLETE_SEQUENCE:
+ case internal::OVERLONG_SEQUENCE:
+ case internal::INVALID_CODE_POINT:
+ out = utf8::append (replacement, out);
+ ++start;
+ // just one replacement mark for the sequence
+ while (start != end && utf8::internal::is_trail(*start))
+ ++start;
+ break;
+ }
+ }
+ return out;
+ }
+
+ template <typename octet_iterator, typename output_iterator>
+ inline output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out)
+ {
+ static const utfchar32_t replacement_marker = utf8::internal::mask16(0xfffd);
+ return utf8::replace_invalid(start, end, out, replacement_marker);
+ }
+
+ inline std::string replace_invalid(const std::string& s, utfchar32_t replacement)
+ {
+ std::string result;
+ replace_invalid(s.begin(), s.end(), std::back_inserter(result), replacement);
+ return result;
+ }
+
+ inline std::string replace_invalid(const std::string& s)
+ {
+ std::string result;
+ replace_invalid(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ template <typename octet_iterator>
+ utfchar32_t next(octet_iterator& it, octet_iterator end)
+ {
+ utfchar32_t cp = 0;
+ internal::utf_error err_code = utf8::internal::validate_next(it, end, cp);
+ switch (err_code) {
+ case internal::UTF8_OK :
+ break;
+ case internal::NOT_ENOUGH_ROOM :
+ throw not_enough_room();
+ case internal::INVALID_LEAD :
+ case internal::INCOMPLETE_SEQUENCE :
+ case internal::OVERLONG_SEQUENCE :
+ throw invalid_utf8(static_cast<utfchar8_t>(*it));
+ case internal::INVALID_CODE_POINT :
+ throw invalid_code_point(cp);
+ }
+ return cp;
+ }
+
+ template <typename word_iterator>
+ utfchar32_t next16(word_iterator& it, word_iterator end)
+ {
+ utfchar32_t cp = 0;
+ internal::utf_error err_code = utf8::internal::validate_next16(it, end, cp);
+ if (err_code == internal::NOT_ENOUGH_ROOM)
+ throw not_enough_room();
+ return cp;
+ }
+
+ template <typename octet_iterator>
+ utfchar32_t peek_next(octet_iterator it, octet_iterator end)
+ {
+ return utf8::next(it, end);
+ }
+
+ template <typename octet_iterator>
+ utfchar32_t prior(octet_iterator& it, octet_iterator start)
+ {
+ // can't do much if it == start
+ if (it == start)
+ throw not_enough_room();
+
+ octet_iterator end = it;
+ // Go back until we hit either a lead octet or start
+ while (utf8::internal::is_trail(*(--it)))
+ if (it == start)
+ throw invalid_utf8(*it); // error - no lead byte in the sequence
+ return utf8::peek_next(it, end);
+ }
+
+ template <typename octet_iterator, typename distance_type>
+ void advance (octet_iterator& it, distance_type n, octet_iterator end)
+ {
+ const distance_type zero(0);
+ if (n < zero) {
+ // backward
+ for (distance_type i = n; i < zero; ++i)
+ utf8::prior(it, end);
+ } else {
+ // forward
+ for (distance_type i = zero; i < n; ++i)
+ utf8::next(it, end);
+ }
+ }
+
+ template <typename octet_iterator>
+ typename std::iterator_traits<octet_iterator>::difference_type
+ distance (octet_iterator first, octet_iterator last)
+ {
+ typename std::iterator_traits<octet_iterator>::difference_type dist;
+ for (dist = 0; first < last; ++dist)
+ utf8::next(first, last);
+ return dist;
+ }
+
+ template <typename u16bit_iterator, typename octet_iterator>
+ octet_iterator utf16to8 (u16bit_iterator start, u16bit_iterator end, octet_iterator result)
+ {
+ while (start != end) {
+ utfchar32_t cp = utf8::internal::mask16(*start++);
+ // Take care of surrogate pairs first
+ if (utf8::internal::is_lead_surrogate(cp)) {
+ if (start != end) {
+ const utfchar32_t trail_surrogate = utf8::internal::mask16(*start++);
+ if (utf8::internal::is_trail_surrogate(trail_surrogate))
+ cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
+ else
+ throw invalid_utf16(static_cast<utfchar16_t>(trail_surrogate));
+ }
+ else
+ throw invalid_utf16(static_cast<utfchar16_t>(cp));
+
+ }
+ // Lone trail surrogate
+ else if (utf8::internal::is_trail_surrogate(cp))
+ throw invalid_utf16(static_cast<utfchar16_t>(cp));
+
+ result = utf8::append(cp, result);
+ }
+ return result;
+ }
+
+ template <typename u16bit_iterator, typename octet_iterator>
+ u16bit_iterator utf8to16 (octet_iterator start, octet_iterator end, u16bit_iterator result)
+ {
+ while (start < end) {
+ const utfchar32_t cp = utf8::next(start, end);
+ if (cp > 0xffff) { //make a surrogate pair
+ *result++ = static_cast<utfchar16_t>((cp >> 10) + internal::LEAD_OFFSET);
+ *result++ = static_cast<utfchar16_t>((cp & 0x3ff) + internal::TRAIL_SURROGATE_MIN);
+ }
+ else
+ *result++ = static_cast<utfchar16_t>(cp);
+ }
+ return result;
+ }
+
+ template <typename octet_iterator, typename u32bit_iterator>
+ octet_iterator utf32to8 (u32bit_iterator start, u32bit_iterator end, octet_iterator result)
+ {
+ while (start != end)
+ result = utf8::append(*(start++), result);
+
+ return result;
+ }
+
+ template <typename octet_iterator, typename u32bit_iterator>
+ u32bit_iterator utf8to32 (octet_iterator start, octet_iterator end, u32bit_iterator result)
+ {
+ while (start < end)
+ (*result++) = utf8::next(start, end);
+
+ return result;
+ }
+
+ // The iterator class
+ template <typename octet_iterator>
+ class iterator {
+ octet_iterator it;
+ octet_iterator range_start;
+ octet_iterator range_end;
+ public:
+ typedef utfchar32_t value_type;
+ typedef utfchar32_t* pointer;
+ typedef utfchar32_t& reference;
+ typedef std::ptrdiff_t difference_type;
+ typedef std::bidirectional_iterator_tag iterator_category;
+ iterator () {}
+ explicit iterator (const octet_iterator& octet_it,
+ const octet_iterator& rangestart,
+ const octet_iterator& rangeend) :
+ it(octet_it), range_start(rangestart), range_end(rangeend)
+ {
+ if (it < range_start || it > range_end)
+ throw std::out_of_range("Invalid utf-8 iterator position");
+ }
+ // the default "big three" are OK
+ octet_iterator base () const { return it; }
+ utfchar32_t operator * () const
+ {
+ octet_iterator temp = it;
+ return utf8::next(temp, range_end);
+ }
+ bool operator == (const iterator& rhs) const
+ {
+ if (range_start != rhs.range_start || range_end != rhs.range_end)
+ throw std::logic_error("Comparing utf-8 iterators defined with different ranges");
+ return (it == rhs.it);
+ }
+ bool operator != (const iterator& rhs) const
+ {
+ return !(operator == (rhs));
+ }
+ iterator& operator ++ ()
+ {
+ utf8::next(it, range_end);
+ return *this;
+ }
+ iterator operator ++ (int)
+ {
+ iterator temp = *this;
+ utf8::next(it, range_end);
+ return temp;
+ }
+ iterator& operator -- ()
+ {
+ utf8::prior(it, range_start);
+ return *this;
+ }
+ iterator operator -- (int)
+ {
+ iterator temp = *this;
+ utf8::prior(it, range_start);
+ return temp;
+ }
+ }; // class iterator
+
+} // namespace utf8
+
+#if UTF_CPP_CPLUSPLUS >= 202002L // C++ 20 or later
+#include "cpp20.h"
+#elif UTF_CPP_CPLUSPLUS >= 201703L // C++ 17 or later
+#include "cpp17.h"
+#elif UTF_CPP_CPLUSPLUS >= 201103L // C++ 11 or later
+#include "cpp11.h"
+#endif // C++ 11 or later
+
+#endif //header guard
+
diff --git a/lib/utfcpp/v4/source/utf8/core.h b/lib/utfcpp/v4/source/utf8/core.h
new file mode 100644
index 00000000..4494c538
--- /dev/null
+++ b/lib/utfcpp/v4/source/utf8/core.h
@@ -0,0 +1,492 @@
+// Copyright 2006 Nemanja Trifunovic
+
+/*
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+
+#ifndef UTF8_FOR_CPP_CORE_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
+#define UTF8_FOR_CPP_CORE_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
+
+#include <iterator>
+#include <cstring>
+#include <string>
+
+// Determine the C++ standard version.
+// If the user defines UTF_CPP_CPLUSPLUS, use that.
+// Otherwise, trust the unreliable predefined macro __cplusplus
+
+#if !defined UTF_CPP_CPLUSPLUS
+ #define UTF_CPP_CPLUSPLUS __cplusplus
+#endif
+
+#if UTF_CPP_CPLUSPLUS >= 201103L // C++ 11 or later
+ #define UTF_CPP_OVERRIDE override
+ #define UTF_CPP_NOEXCEPT noexcept
+#else // C++ 98/03
+ #define UTF_CPP_OVERRIDE
+ #define UTF_CPP_NOEXCEPT throw()
+#endif // C++ 11 or later
+
+
+namespace utf8
+{
+// The typedefs for 8-bit, 16-bit and 32-bit code units
+#if UTF_CPP_CPLUSPLUS >= 201103L // C++ 11 or later
+ #if UTF_CPP_CPLUSPLUS >= 202002L // C++ 20 or later
+ typedef char8_t utfchar8_t;
+ #else // C++ 11/14/17
+ typedef unsigned char utfchar8_t;
+ #endif
+ typedef char16_t utfchar16_t;
+ typedef char32_t utfchar32_t;
+#else // C++ 98/03
+ typedef unsigned char utfchar8_t;
+ typedef unsigned short utfchar16_t;
+ typedef unsigned int utfchar32_t;
+#endif // C++ 11 or later
+
+// Helper code - not intended to be directly called by the library users. May be changed at any time
+namespace internal
+{
+ // Unicode constants
+ // Leading (high) surrogates: 0xd800 - 0xdbff
+ // Trailing (low) surrogates: 0xdc00 - 0xdfff
+ const utfchar16_t LEAD_SURROGATE_MIN = 0xd800u;
+ const utfchar16_t LEAD_SURROGATE_MAX = 0xdbffu;
+ const utfchar16_t TRAIL_SURROGATE_MIN = 0xdc00u;
+ const utfchar16_t TRAIL_SURROGATE_MAX = 0xdfffu;
+ const utfchar16_t LEAD_OFFSET = 0xd7c0u; // LEAD_SURROGATE_MIN - (0x10000 >> 10)
+ const utfchar32_t SURROGATE_OFFSET = 0xfca02400u; // 0x10000u - (LEAD_SURROGATE_MIN << 10) - TRAIL_SURROGATE_MIN
+
+ // Maximum valid value for a Unicode code point
+ const utfchar32_t CODE_POINT_MAX = 0x0010ffffu;
+
+ template<typename octet_type>
+ inline utfchar8_t mask8(octet_type oc)
+ {
+ return static_cast<utfchar8_t>(0xff & oc);
+ }
+ template<typename u16_type>
+ inline utfchar16_t mask16(u16_type oc)
+ {
+ return static_cast<utfchar16_t>(0xffff & oc);
+ }
+
+ template<typename octet_type>
+ inline bool is_trail(octet_type oc)
+ {
+ return ((utf8::internal::mask8(oc) >> 6) == 0x2);
+ }
+
+ inline bool is_lead_surrogate(utfchar32_t cp)
+ {
+ return (cp >= LEAD_SURROGATE_MIN && cp <= LEAD_SURROGATE_MAX);
+ }
+
+ inline bool is_trail_surrogate(utfchar32_t cp)
+ {
+ return (cp >= TRAIL_SURROGATE_MIN && cp <= TRAIL_SURROGATE_MAX);
+ }
+
+ inline bool is_surrogate(utfchar32_t cp)
+ {
+ return (cp >= LEAD_SURROGATE_MIN && cp <= TRAIL_SURROGATE_MAX);
+ }
+
+ inline bool is_code_point_valid(utfchar32_t cp)
+ {
+ return (cp <= CODE_POINT_MAX && !utf8::internal::is_surrogate(cp));
+ }
+
+ inline bool is_in_bmp(utfchar32_t cp)
+ {
+ return cp < utfchar32_t(0x10000);
+ }
+
+ template <typename octet_iterator>
+ int sequence_length(octet_iterator lead_it)
+ {
+ const utfchar8_t lead = utf8::internal::mask8(*lead_it);
+ if (lead < 0x80)
+ return 1;
+ else if ((lead >> 5) == 0x6)
+ return 2;
+ else if ((lead >> 4) == 0xe)
+ return 3;
+ else if ((lead >> 3) == 0x1e)
+ return 4;
+ else
+ return 0;
+ }
+
+ inline bool is_overlong_sequence(utfchar32_t cp, int length)
+ {
+ if (cp < 0x80) {
+ if (length != 1)
+ return true;
+ }
+ else if (cp < 0x800) {
+ if (length != 2)
+ return true;
+ }
+ else if (cp < 0x10000) {
+ if (length != 3)
+ return true;
+ }
+ return false;
+ }
+
+ enum utf_error {UTF8_OK, NOT_ENOUGH_ROOM, INVALID_LEAD, INCOMPLETE_SEQUENCE, OVERLONG_SEQUENCE, INVALID_CODE_POINT};
+
+ /// Helper for get_sequence_x
+ template <typename octet_iterator>
+ utf_error increase_safely(octet_iterator& it, const octet_iterator end)
+ {
+ if (++it == end)
+ return NOT_ENOUGH_ROOM;
+
+ if (!utf8::internal::is_trail(*it))
+ return INCOMPLETE_SEQUENCE;
+
+ return UTF8_OK;
+ }
+
+ #define UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(IT, END) {utf_error ret = increase_safely(IT, END); if (ret != UTF8_OK) return ret;}
+
+ /// get_sequence_x functions decode utf-8 sequences of the length x
+ template <typename octet_iterator>
+ utf_error get_sequence_1(octet_iterator& it, octet_iterator end, utfchar32_t& code_point)
+ {
+ if (it == end)
+ return NOT_ENOUGH_ROOM;
+
+ code_point = utf8::internal::mask8(*it);
+
+ return UTF8_OK;
+ }
+
+ template <typename octet_iterator>
+ utf_error get_sequence_2(octet_iterator& it, octet_iterator end, utfchar32_t& code_point)
+ {
+ if (it == end)
+ return NOT_ENOUGH_ROOM;
+
+ code_point = utf8::internal::mask8(*it);
+
+ UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
+
+ code_point = ((code_point << 6) & 0x7ff) + ((*it) & 0x3f);
+
+ return UTF8_OK;
+ }
+
+ template <typename octet_iterator>
+ utf_error get_sequence_3(octet_iterator& it, octet_iterator end, utfchar32_t& code_point)
+ {
+ if (it == end)
+ return NOT_ENOUGH_ROOM;
+
+ code_point = utf8::internal::mask8(*it);
+
+ UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
+
+ code_point = ((code_point << 12) & 0xffff) + ((utf8::internal::mask8(*it) << 6) & 0xfff);
+
+ UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
+
+ code_point += (*it) & 0x3f;
+
+ return UTF8_OK;
+ }
+
+ template <typename octet_iterator>
+ utf_error get_sequence_4(octet_iterator& it, octet_iterator end, utfchar32_t& code_point)
+ {
+ if (it == end)
+ return NOT_ENOUGH_ROOM;
+
+ code_point = utf8::internal::mask8(*it);
+
+ UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
+
+ code_point = ((code_point << 18) & 0x1fffff) + ((utf8::internal::mask8(*it) << 12) & 0x3ffff);
+
+ UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
+
+ code_point += (utf8::internal::mask8(*it) << 6) & 0xfff;
+
+ UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
+
+ code_point += (*it) & 0x3f;
+
+ return UTF8_OK;
+ }
+
+ #undef UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR
+
+ template <typename octet_iterator>
+ utf_error validate_next(octet_iterator& it, octet_iterator end, utfchar32_t& code_point)
+ {
+ if (it == end)
+ return NOT_ENOUGH_ROOM;
+
+ // Save the original value of it so we can go back in case of failure
+ // Of course, it does not make much sense with i.e. stream iterators
+ octet_iterator original_it = it;
+
+ utfchar32_t cp = 0;
+ // Determine the sequence length based on the lead octet
+ const int length = utf8::internal::sequence_length(it);
+
+ // Get trail octets and calculate the code point
+ utf_error err = UTF8_OK;
+ switch (length) {
+ case 0:
+ return INVALID_LEAD;
+ case 1:
+ err = utf8::internal::get_sequence_1(it, end, cp);
+ break;
+ case 2:
+ err = utf8::internal::get_sequence_2(it, end, cp);
+ break;
+ case 3:
+ err = utf8::internal::get_sequence_3(it, end, cp);
+ break;
+ case 4:
+ err = utf8::internal::get_sequence_4(it, end, cp);
+ break;
+ }
+
+ if (err == UTF8_OK) {
+ // Decoding succeeded. Now, security checks...
+ if (utf8::internal::is_code_point_valid(cp)) {
+ if (!utf8::internal::is_overlong_sequence(cp, length)){
+ // Passed! Return here.
+ code_point = cp;
+ ++it;
+ return UTF8_OK;
+ }
+ else
+ err = OVERLONG_SEQUENCE;
+ }
+ else
+ err = INVALID_CODE_POINT;
+ }
+
+ // Failure branch - restore the original value of the iterator
+ it = original_it;
+ return err;
+ }
+
+ template <typename octet_iterator>
+ inline utf_error validate_next(octet_iterator& it, octet_iterator end) {
+ utfchar32_t ignored;
+ return utf8::internal::validate_next(it, end, ignored);
+ }
+
+ template <typename word_iterator>
+ utf_error validate_next16(word_iterator& it, word_iterator end, utfchar32_t& code_point)
+ {
+ if (it == end)
+ return NOT_ENOUGH_ROOM;
+ // Save the original value of it so we can go back in case of failure
+ // Of course, it does not make much sense with i.e. stream iterators
+ word_iterator original_it = it;
+
+ utf_error err = UTF8_OK;
+
+ const utfchar16_t first_word = *it++;
+ if (!is_surrogate(first_word)) {
+ code_point = first_word;
+ return UTF8_OK;
+ }
+ else {
+ if (it == end)
+ err = NOT_ENOUGH_ROOM;
+ else if (is_lead_surrogate(first_word)) {
+ const utfchar16_t second_word = *it++;
+ if (is_trail_surrogate(second_word)) {
+ code_point = (first_word << 10) + second_word + SURROGATE_OFFSET;
+ return UTF8_OK;
+ } else
+ err = INCOMPLETE_SEQUENCE;
+
+ } else {
+ err = INVALID_LEAD;
+ }
+ }
+ // error branch
+ it = original_it;
+ return err;
+ }
+
+ // Internal implementation of both checked and unchecked append() function
+ // This function will be invoked by the overloads below, as they will know
+ // the octet_type.
+ template <typename octet_iterator, typename octet_type>
+ octet_iterator append(utfchar32_t cp, octet_iterator result) {
+ if (cp < 0x80) // one octet
+ *(result++) = static_cast<octet_type>(cp);
+ else if (cp < 0x800) { // two octets
+ *(result++) = static_cast<octet_type>((cp >> 6) | 0xc0);
+ *(result++) = static_cast<octet_type>((cp & 0x3f) | 0x80);
+ }
+ else if (cp < 0x10000) { // three octets
+ *(result++) = static_cast<octet_type>((cp >> 12) | 0xe0);
+ *(result++) = static_cast<octet_type>(((cp >> 6) & 0x3f) | 0x80);
+ *(result++) = static_cast<octet_type>((cp & 0x3f) | 0x80);
+ }
+ else { // four octets
+ *(result++) = static_cast<octet_type>((cp >> 18) | 0xf0);
+ *(result++) = static_cast<octet_type>(((cp >> 12) & 0x3f)| 0x80);
+ *(result++) = static_cast<octet_type>(((cp >> 6) & 0x3f) | 0x80);
+ *(result++) = static_cast<octet_type>((cp & 0x3f) | 0x80);
+ }
+ return result;
+ }
+
+ // One of the following overloads will be invoked from the API calls
+
+ // A simple (but dangerous) case: the caller appends byte(s) to a char array
+ inline char* append(utfchar32_t cp, char* result) {
+ return append<char*, char>(cp, result);
+ }
+
+ // Hopefully, most common case: the caller uses back_inserter
+ // i.e. append(cp, std::back_inserter(str));
+ template<typename container_type>
+ std::back_insert_iterator<container_type> append
+ (utfchar32_t cp, std::back_insert_iterator<container_type> result) {
+ return append<std::back_insert_iterator<container_type>,
+ typename container_type::value_type>(cp, result);
+ }
+
+ // The caller uses some other kind of output operator - not covered above
+ // Note that in this case we are not able to determine octet_type
+ // so we assume it's utfchar8_t; that can cause a conversion warning if we are wrong.
+ template <typename octet_iterator>
+ octet_iterator append(utfchar32_t cp, octet_iterator result) {
+ return append<octet_iterator, utfchar8_t>(cp, result);
+ }
+
+ // Internal implementation of both checked and unchecked append16() function
+ // This function will be invoked by the overloads below, as they will know
+ // the word_type.
+ template <typename word_iterator, typename word_type>
+ word_iterator append16(utfchar32_t cp, word_iterator result) {
+ if (is_in_bmp(cp))
+ *(result++) = static_cast<word_type>(cp);
+ else {
+ // Code points from the supplementary planes are encoded via surrogate pairs
+ *(result++) = static_cast<word_type>(LEAD_OFFSET + (cp >> 10));
+ *(result++) = static_cast<word_type>(TRAIL_SURROGATE_MIN + (cp & 0x3FF));
+ }
+ return result;
+ }
+
+ // Hopefully, most common case: the caller uses back_inserter
+ // i.e. append16(cp, std::back_inserter(str));
+ template<typename container_type>
+ std::back_insert_iterator<container_type> append16
+ (utfchar32_t cp, std::back_insert_iterator<container_type> result) {
+ return append16<std::back_insert_iterator<container_type>,
+ typename container_type::value_type>(cp, result);
+ }
+
+ // The caller uses some other kind of output operator - not covered above
+ // Note that in this case we are not able to determine word_type
+ // so we assume it's utfchar16_t; that can cause a conversion warning if we are wrong.
+ template <typename word_iterator>
+ word_iterator append16(utfchar32_t cp, word_iterator result) {
+ return append16<word_iterator, utfchar16_t>(cp, result);
+ }
+
+} // namespace internal
+
+ /// The library API - functions intended to be called by the users
+
+ // Byte order mark
+ const utfchar8_t bom[] = {0xef, 0xbb, 0xbf};
+
+ template <typename octet_iterator>
+ octet_iterator find_invalid(octet_iterator start, octet_iterator end)
+ {
+ octet_iterator result = start;
+ while (result != end) {
+ utf8::internal::utf_error err_code = utf8::internal::validate_next(result, end);
+ if (err_code != internal::UTF8_OK)
+ return result;
+ }
+ return result;
+ }
+
+ inline const char* find_invalid(const char* str)
+ {
+ const char* end = str + std::strlen(str);
+ return find_invalid(str, end);
+ }
+
+ inline std::size_t find_invalid(const std::string& s)
+ {
+ std::string::const_iterator invalid = find_invalid(s.begin(), s.end());
+ return (invalid == s.end()) ? std::string::npos : static_cast<std::size_t>(invalid - s.begin());
+ }
+
+ template <typename octet_iterator>
+ inline bool is_valid(octet_iterator start, octet_iterator end)
+ {
+ return (utf8::find_invalid(start, end) == end);
+ }
+
+ inline bool is_valid(const char* str)
+ {
+ return (*(utf8::find_invalid(str)) == '\0');
+ }
+
+ inline bool is_valid(const std::string& s)
+ {
+ return is_valid(s.begin(), s.end());
+ }
+
+
+
+ template <typename octet_iterator>
+ inline bool starts_with_bom (octet_iterator it, octet_iterator end)
+ {
+ return (
+ ((it != end) && (utf8::internal::mask8(*it++)) == bom[0]) &&
+ ((it != end) && (utf8::internal::mask8(*it++)) == bom[1]) &&
+ ((it != end) && (utf8::internal::mask8(*it)) == bom[2])
+ );
+ }
+
+ inline bool starts_with_bom(const std::string& s)
+ {
+ return starts_with_bom(s.begin(), s.end());
+ }
+} // namespace utf8
+
+#endif // header guard
+
+
diff --git a/lib/utfcpp/v4/source/utf8/cpp11.h b/lib/utfcpp/v4/source/utf8/cpp11.h
new file mode 100644
index 00000000..691633c8
--- /dev/null
+++ b/lib/utfcpp/v4/source/utf8/cpp11.h
@@ -0,0 +1,70 @@
+// Copyright 2018 Nemanja Trifunovic
+
+/*
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+
+#ifndef UTF8_FOR_CPP_a184c22c_d012_11e8_a8d5_f2801f1b9fd1
+#define UTF8_FOR_CPP_a184c22c_d012_11e8_a8d5_f2801f1b9fd1
+
+#include "checked.h"
+
+namespace utf8
+{
+ inline void append16(utfchar32_t cp, std::u16string& s)
+ {
+ append16(cp, std::back_inserter(s));
+ }
+
+ inline std::string utf16to8(const std::u16string& s)
+ {
+ std::string result;
+ utf16to8(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u16string utf8to16(const std::string& s)
+ {
+ std::u16string result;
+ utf8to16(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::string utf32to8(const std::u32string& s)
+ {
+ std::string result;
+ utf32to8(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u32string utf8to32(const std::string& s)
+ {
+ std::u32string result;
+ utf8to32(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+} // namespace utf8
+
+#endif // header guard
+
diff --git a/lib/utfcpp/v4/source/utf8/cpp17.h b/lib/utfcpp/v4/source/utf8/cpp17.h
new file mode 100644
index 00000000..6e2fcc23
--- /dev/null
+++ b/lib/utfcpp/v4/source/utf8/cpp17.h
@@ -0,0 +1,96 @@
+// Copyright 2018 Nemanja Trifunovic
+
+/*
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+
+#ifndef UTF8_FOR_CPP_7e906c01_03a3_4daf_b420_ea7ea952b3c9
+#define UTF8_FOR_CPP_7e906c01_03a3_4daf_b420_ea7ea952b3c9
+
+#include "cpp11.h"
+
+namespace utf8
+{
+ inline std::string utf16to8(std::u16string_view s)
+ {
+ std::string result;
+ utf16to8(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u16string utf8to16(std::string_view s)
+ {
+ std::u16string result;
+ utf8to16(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::string utf32to8(std::u32string_view s)
+ {
+ std::string result;
+ utf32to8(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u32string utf8to32(std::string_view s)
+ {
+ std::u32string result;
+ utf8to32(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::size_t find_invalid(std::string_view s)
+ {
+ std::string_view::const_iterator invalid = find_invalid(s.begin(), s.end());
+ return (invalid == s.end()) ? std::string_view::npos : static_cast<std::size_t>(invalid - s.begin());
+ }
+
+ inline bool is_valid(std::string_view s)
+ {
+ return is_valid(s.begin(), s.end());
+ }
+
+ inline std::string replace_invalid(std::string_view s, char32_t replacement)
+ {
+ std::string result;
+ replace_invalid(s.begin(), s.end(), std::back_inserter(result), replacement);
+ return result;
+ }
+
+ inline std::string replace_invalid(std::string_view s)
+ {
+ std::string result;
+ replace_invalid(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline bool starts_with_bom(std::string_view s)
+ {
+ return starts_with_bom(s.begin(), s.end());
+ }
+
+} // namespace utf8
+
+#endif // header guard
+
diff --git a/lib/utfcpp/v4/source/utf8/cpp20.h b/lib/utfcpp/v4/source/utf8/cpp20.h
new file mode 100644
index 00000000..07b61d0f
--- /dev/null
+++ b/lib/utfcpp/v4/source/utf8/cpp20.h
@@ -0,0 +1,124 @@
+// Copyright 2022 Nemanja Trifunovic
+
+/*
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+
+#ifndef UTF8_FOR_CPP_207e906c01_03a3_4daf_b420_ea7ea952b3c9
+#define UTF8_FOR_CPP_207e906c01_03a3_4daf_b420_ea7ea952b3c9
+
+#include "cpp17.h"
+
+namespace utf8
+{
+ inline std::u8string utf16tou8(const std::u16string& s)
+ {
+ std::u8string result;
+ utf16to8(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u8string utf16tou8(std::u16string_view s)
+ {
+ std::u8string result;
+ utf16to8(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u16string utf8to16(const std::u8string& s)
+ {
+ std::u16string result;
+ utf8to16(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u16string utf8to16(const std::u8string_view& s)
+ {
+ std::u16string result;
+ utf8to16(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u8string utf32tou8(const std::u32string& s)
+ {
+ std::u8string result;
+ utf32to8(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u8string utf32tou8(const std::u32string_view& s)
+ {
+ std::u8string result;
+ utf32to8(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u32string utf8to32(const std::u8string& s)
+ {
+ std::u32string result;
+ utf8to32(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::u32string utf8to32(const std::u8string_view& s)
+ {
+ std::u32string result;
+ utf8to32(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline std::size_t find_invalid(const std::u8string& s)
+ {
+ std::u8string::const_iterator invalid = find_invalid(s.begin(), s.end());
+ return (invalid == s.end()) ? std::string_view::npos : static_cast<std::size_t>(invalid - s.begin());
+ }
+
+ inline bool is_valid(const std::u8string& s)
+ {
+ return is_valid(s.begin(), s.end());
+ }
+
+ inline std::u8string replace_invalid(const std::u8string& s, char32_t replacement)
+ {
+ std::u8string result;
+ replace_invalid(s.begin(), s.end(), std::back_inserter(result), replacement);
+ return result;
+ }
+
+ inline std::u8string replace_invalid(const std::u8string& s)
+ {
+ std::u8string result;
+ replace_invalid(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ inline bool starts_with_bom(const std::u8string& s)
+ {
+ return starts_with_bom(s.begin(), s.end());
+ }
+
+} // namespace utf8
+
+#endif // header guard
+
diff --git a/lib/utfcpp/v4/source/utf8/unchecked.h b/lib/utfcpp/v4/source/utf8/unchecked.h
new file mode 100644
index 00000000..65d4948f
--- /dev/null
+++ b/lib/utfcpp/v4/source/utf8/unchecked.h
@@ -0,0 +1,287 @@
+// Copyright 2006 Nemanja Trifunovic
+
+/*
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+*/
+
+
+#ifndef UTF8_FOR_CPP_UNCHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
+#define UTF8_FOR_CPP_UNCHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
+
+#include "core.h"
+
+namespace utf8
+{
+ namespace unchecked
+ {
+ template <typename octet_iterator>
+ octet_iterator append(utfchar32_t cp, octet_iterator result)
+ {
+ return internal::append(cp, result);
+ }
+
+ template <typename word_iterator>
+ word_iterator append16(utfchar32_t cp, word_iterator result)
+ {
+ return internal::append16(cp, result);
+ }
+
+ template <typename octet_iterator, typename output_iterator>
+ output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out, utfchar32_t replacement)
+ {
+ while (start != end) {
+ octet_iterator sequence_start = start;
+ internal::utf_error err_code = utf8::internal::validate_next(start, end);
+ switch (err_code) {
+ case internal::UTF8_OK :
+ for (octet_iterator it = sequence_start; it != start; ++it)
+ *out++ = *it;
+ break;
+ case internal::NOT_ENOUGH_ROOM:
+ out = utf8::unchecked::append(replacement, out);
+ start = end;
+ break;
+ case internal::INVALID_LEAD:
+ out = utf8::unchecked::append(replacement, out);
+ ++start;
+ break;
+ case internal::INCOMPLETE_SEQUENCE:
+ case internal::OVERLONG_SEQUENCE:
+ case internal::INVALID_CODE_POINT:
+ out = utf8::unchecked::append(replacement, out);
+ ++start;
+ // just one replacement mark for the sequence
+ while (start != end && utf8::internal::is_trail(*start))
+ ++start;
+ break;
+ }
+ }
+ return out;
+ }
+
+ template <typename octet_iterator, typename output_iterator>
+ inline output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out)
+ {
+ static const utfchar32_t replacement_marker = utf8::internal::mask16(0xfffd);
+ return utf8::unchecked::replace_invalid(start, end, out, replacement_marker);
+ }
+
+ inline std::string replace_invalid(const std::string& s, utfchar32_t replacement)
+ {
+ std::string result;
+ replace_invalid(s.begin(), s.end(), std::back_inserter(result), replacement);
+ return result;
+ }
+
+ inline std::string replace_invalid(const std::string& s)
+ {
+ std::string result;
+ replace_invalid(s.begin(), s.end(), std::back_inserter(result));
+ return result;
+ }
+
+ template <typename octet_iterator>
+ utfchar32_t next(octet_iterator& it)
+ {
+ utfchar32_t cp = utf8::internal::mask8(*it);
+ switch (utf8::internal::sequence_length(it)) {
+ case 1:
+ break;
+ case 2:
+ it++;
+ cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);
+ break;
+ case 3:
+ ++it;
+ cp = ((cp << 12) & 0xffff) + ((utf8::internal::mask8(*it) << 6) & 0xfff);
+ ++it;
+ cp += (*it) & 0x3f;
+ break;
+ case 4:
+ ++it;
+ cp = ((cp << 18) & 0x1fffff) + ((utf8::internal::mask8(*it) << 12) & 0x3ffff);
+ ++it;
+ cp += (utf8::internal::mask8(*it) << 6) & 0xfff;
+ ++it;
+ cp += (*it) & 0x3f;
+ break;
+ }
+ ++it;
+ return cp;
+ }
+
+ template <typename octet_iterator>
+ utfchar32_t peek_next(octet_iterator it)
+ {
+ return utf8::unchecked::next(it);
+ }
+
+ template <typename word_iterator>
+ utfchar32_t next16(word_iterator& it)
+ {
+ utfchar32_t cp = utf8::internal::mask16(*it++);
+ if (utf8::internal::is_lead_surrogate(cp))
+ return (cp << 10) + *it++ + utf8::internal::SURROGATE_OFFSET;
+ return cp;
+ }
+
+ template <typename octet_iterator>
+ utfchar32_t prior(octet_iterator& it)
+ {
+ while (utf8::internal::is_trail(*(--it))) ;
+ octet_iterator temp = it;
+ return utf8::unchecked::next(temp);
+ }
+
+ template <typename octet_iterator, typename distance_type>
+ void advance(octet_iterator& it, distance_type n)
+ {
+ const distance_type zero(0);
+ if (n < zero) {
+ // backward
+ for (distance_type i = n; i < zero; ++i)
+ utf8::unchecked::prior(it);
+ } else {
+ // forward
+ for (distance_type i = zero; i < n; ++i)
+ utf8::unchecked::next(it);
+ }
+ }
+
+ template <typename octet_iterator>
+ typename std::iterator_traits<octet_iterator>::difference_type
+ distance(octet_iterator first, octet_iterator last)
+ {
+ typename std::iterator_traits<octet_iterator>::difference_type dist;
+ for (dist = 0; first < last; ++dist)
+ utf8::unchecked::next(first);
+ return dist;
+ }
+
+ template <typename u16bit_iterator, typename octet_iterator>
+ octet_iterator utf16to8(u16bit_iterator start, u16bit_iterator end, octet_iterator result)
+ {
+ while (start != end) {
+ utfchar32_t cp = utf8::internal::mask16(*start++);
+ // Take care of surrogate pairs first
+ if (utf8::internal::is_lead_surrogate(cp)) {
+ if (start == end)
+ return result;
+ utfchar32_t trail_surrogate = utf8::internal::mask16(*start++);
+ cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
+ }
+ result = utf8::unchecked::append(cp, result);
+ }
+ return result;
+ }
+
+ template <typename u16bit_iterator, typename octet_iterator>
+ u16bit_iterator utf8to16(octet_iterator start, octet_iterator end, u16bit_iterator result)
+ {
+ while (start < end) {
+ utfchar32_t cp = utf8::unchecked::next(start);
+ if (cp > 0xffff) { //make a surrogate pair
+ *result++ = static_cast<utfchar16_t>((cp >> 10) + internal::LEAD_OFFSET);
+ *result++ = static_cast<utfchar16_t>((cp & 0x3ff) + internal::TRAIL_SURROGATE_MIN);
+ }
+ else
+ *result++ = static_cast<utfchar16_t>(cp);
+ }
+ return result;
+ }
+
+ template <typename octet_iterator, typename u32bit_iterator>
+ octet_iterator utf32to8(u32bit_iterator start, u32bit_iterator end, octet_iterator result)
+ {
+ while (start != end)
+ result = utf8::unchecked::append(*(start++), result);
+
+ return result;
+ }
+
+ template <typename octet_iterator, typename u32bit_iterator>
+ u32bit_iterator utf8to32(octet_iterator start, octet_iterator end, u32bit_iterator result)
+ {
+ while (start < end)
+ (*result++) = utf8::unchecked::next(start);
+
+ return result;
+ }
+
+ // The iterator class
+ template <typename octet_iterator>
+ class iterator {
+ octet_iterator it;
+ public:
+ typedef utfchar32_t value_type;
+ typedef utfchar32_t* pointer;
+ typedef utfchar32_t& reference;
+ typedef std::ptrdiff_t difference_type;
+ typedef std::bidirectional_iterator_tag iterator_category;
+ iterator () {}
+ explicit iterator (const octet_iterator& octet_it): it(octet_it) {}
+ // the default "big three" are OK
+ octet_iterator base () const { return it; }
+ utfchar32_t operator * () const
+ {
+ octet_iterator temp = it;
+ return utf8::unchecked::next(temp);
+ }
+ bool operator == (const iterator& rhs) const
+ {
+ return (it == rhs.it);
+ }
+ bool operator != (const iterator& rhs) const
+ {
+ return !(operator == (rhs));
+ }
+ iterator& operator ++ ()
+ {
+ ::std::advance(it, utf8::internal::sequence_length(it));
+ return *this;
+ }
+ iterator operator ++ (int)
+ {
+ iterator temp = *this;
+ ::std::advance(it, utf8::internal::sequence_length(it));
+ return temp;
+ }
+ iterator& operator -- ()
+ {
+ utf8::unchecked::prior(it);
+ return *this;
+ }
+ iterator operator -- (int)
+ {
+ iterator temp = *this;
+ utf8::unchecked::prior(it);
+ return temp;
+ }
+ }; // class iterator
+
+ } // namespace utf8::unchecked
+} // namespace utf8
+
+
+#endif // header guard
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-29 17:11:09 +0000