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-// 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>
-
-namespace utf8
-{
- // The typedefs for 8-bit, 16-bit and 32-bit unsigned integers
- // You may need to change them to match your system.
- // These typedefs have the same names as ones from cstdint, or boost/cstdint
- typedef unsigned char uint8_t;
- typedef unsigned short uint16_t;
- typedef unsigned int uint32_t;
-
-// 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 uint16_t LEAD_SURROGATE_MIN = 0xd800u;
- const uint16_t LEAD_SURROGATE_MAX = 0xdbffu;
- const uint16_t TRAIL_SURROGATE_MIN = 0xdc00u;
- const uint16_t TRAIL_SURROGATE_MAX = 0xdfffu;
- const uint16_t LEAD_OFFSET = LEAD_SURROGATE_MIN - (0x10000 >> 10);
- const uint32_t SURROGATE_OFFSET = 0x10000u - (LEAD_SURROGATE_MIN << 10) - TRAIL_SURROGATE_MIN;
-
- // Maximum valid value for a Unicode code point
- const uint32_t CODE_POINT_MAX = 0x0010ffffu;
-
- template<typename octet_type>
- inline uint8_t mask8(octet_type oc)
- {
- return static_cast<uint8_t>(0xff & oc);
- }
- template<typename u16_type>
- inline uint16_t mask16(u16_type oc)
- {
- return static_cast<uint16_t>(0xffff & oc);
- }
- template<typename octet_type>
- inline bool is_trail(octet_type oc)
- {
- return ((utf8::internal::mask8(oc) >> 6) == 0x2);
- }
-
- template <typename u16>
- inline bool is_lead_surrogate(u16 cp)
- {
- return (cp >= LEAD_SURROGATE_MIN && cp <= LEAD_SURROGATE_MAX);
- }
-
- template <typename u16>
- inline bool is_trail_surrogate(u16 cp)
- {
- return (cp >= TRAIL_SURROGATE_MIN && cp <= TRAIL_SURROGATE_MAX);
- }
-
- template <typename u16>
- inline bool is_surrogate(u16 cp)
- {
- return (cp >= LEAD_SURROGATE_MIN && cp <= TRAIL_SURROGATE_MAX);
- }
-
- template <typename u32>
- inline bool is_code_point_valid(u32 cp)
- {
- return (cp <= CODE_POINT_MAX && !utf8::internal::is_surrogate(cp));
- }
-
- template <typename octet_iterator>
- inline typename std::iterator_traits<octet_iterator>::difference_type
- sequence_length(octet_iterator lead_it)
- {
- uint8_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;
- }
-
- template <typename octet_difference_type>
- inline bool is_overlong_sequence(uint32_t cp, octet_difference_type 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, 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, uint32_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, uint32_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, uint32_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, uint32_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, uint32_t& code_point)
- {
- // 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;
-
- uint32_t cp = 0;
- // Determine the sequence length based on the lead octet
- typedef typename std::iterator_traits<octet_iterator>::difference_type octet_difference_type;
- const octet_difference_type 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) {
- uint32_t ignored;
- return utf8::internal::validate_next(it, end, ignored);
- }
-
-} // namespace internal
-
- /// The library API - functions intended to be called by the users
-
- // Byte order mark
- const uint8_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;
- }
-
- template <typename octet_iterator>
- inline bool is_valid(octet_iterator start, octet_iterator end)
- {
- return (utf8::find_invalid(start, end) == 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])
- );
- }
-
- //Deprecated in release 2.3
- template <typename octet_iterator>
- inline bool is_bom (octet_iterator it)
- {
- return (
- (utf8::internal::mask8(*it++)) == bom[0] &&
- (utf8::internal::mask8(*it++)) == bom[1] &&
- (utf8::internal::mask8(*it)) == bom[2]
- );
- }
-} // namespace utf8
-
-#endif // header guard
-
-
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