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Reformat all code to coding standard
This commit is contained in:
Andrew Hutchings
@ -36,286 +36,304 @@ namespace utf8
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// Helper code - not intended to be directly called by the library users. May be changed at any time
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namespace internal
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{
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// Unicode constants
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// Leading (high) surrogates: 0xd800 - 0xdbff
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// Trailing (low) surrogates: 0xdc00 - 0xdfff
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const uint16_t LEAD_SURROGATE_MIN = 0xd800u;
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const uint16_t LEAD_SURROGATE_MAX = 0xdbffu;
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const uint16_t TRAIL_SURROGATE_MIN = 0xdc00u;
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const uint16_t TRAIL_SURROGATE_MAX = 0xdfffu;
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const uint16_t LEAD_OFFSET = LEAD_SURROGATE_MIN - (0x10000 >> 10);
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const uint32_t SURROGATE_OFFSET = 0x10000u - (LEAD_SURROGATE_MIN << 10) - TRAIL_SURROGATE_MIN;
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// Unicode constants
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// Leading (high) surrogates: 0xd800 - 0xdbff
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// Trailing (low) surrogates: 0xdc00 - 0xdfff
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const uint16_t LEAD_SURROGATE_MIN = 0xd800u;
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const uint16_t LEAD_SURROGATE_MAX = 0xdbffu;
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const uint16_t TRAIL_SURROGATE_MIN = 0xdc00u;
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const uint16_t TRAIL_SURROGATE_MAX = 0xdfffu;
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const uint16_t LEAD_OFFSET = LEAD_SURROGATE_MIN - (0x10000 >> 10);
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const uint32_t SURROGATE_OFFSET = 0x10000u - (LEAD_SURROGATE_MIN << 10) - TRAIL_SURROGATE_MIN;
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// Maximum valid value for a Unicode code point
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const uint32_t CODE_POINT_MAX = 0x0010ffffu;
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// Maximum valid value for a Unicode code point
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const uint32_t CODE_POINT_MAX = 0x0010ffffu;
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template<typename octet_type>
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inline uint8_t mask8(octet_type oc)
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template<typename octet_type>
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inline uint8_t mask8(octet_type oc)
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{
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return static_cast<uint8_t>(0xff & oc);
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}
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template<typename u16_type>
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inline uint16_t mask16(u16_type oc)
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{
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return static_cast<uint16_t>(0xffff & oc);
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}
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template<typename octet_type>
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inline bool is_trail(octet_type oc)
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{
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return ((utf8::internal::mask8(oc) >> 6) == 0x2);
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}
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template <typename u16>
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inline bool is_lead_surrogate(u16 cp)
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{
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return (cp >= LEAD_SURROGATE_MIN && cp <= LEAD_SURROGATE_MAX);
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}
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template <typename u16>
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inline bool is_trail_surrogate(u16 cp)
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{
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return (cp >= TRAIL_SURROGATE_MIN && cp <= TRAIL_SURROGATE_MAX);
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}
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template <typename u16>
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inline bool is_surrogate(u16 cp)
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{
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return (cp >= LEAD_SURROGATE_MIN && cp <= TRAIL_SURROGATE_MAX);
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}
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template <typename u32>
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inline bool is_code_point_valid(u32 cp)
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{
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return (cp <= CODE_POINT_MAX && !utf8::internal::is_surrogate(cp));
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}
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template <typename octet_iterator>
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inline typename std::iterator_traits<octet_iterator>::difference_type
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sequence_length(octet_iterator lead_it)
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{
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uint8_t lead = utf8::internal::mask8(*lead_it);
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if (lead < 0x80)
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return 1;
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else if ((lead >> 5) == 0x6)
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return 2;
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else if ((lead >> 4) == 0xe)
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return 3;
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else if ((lead >> 3) == 0x1e)
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return 4;
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else
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return 0;
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}
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template <typename octet_difference_type>
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inline bool is_overlong_sequence(uint32_t cp, octet_difference_type length)
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{
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if (cp < 0x80)
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{
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return static_cast<uint8_t>(0xff & oc);
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if (length != 1)
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return true;
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}
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template<typename u16_type>
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inline uint16_t mask16(u16_type oc)
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else if (cp < 0x800)
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{
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return static_cast<uint16_t>(0xffff & oc);
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if (length != 2)
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return true;
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}
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template<typename octet_type>
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inline bool is_trail(octet_type oc)
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else if (cp < 0x10000)
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{
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return ((utf8::internal::mask8(oc) >> 6) == 0x2);
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if (length != 3)
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return true;
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}
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template <typename u16>
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inline bool is_lead_surrogate(u16 cp)
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return false;
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}
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enum utf_error {UTF8_OK, NOT_ENOUGH_ROOM, INVALID_LEAD, INCOMPLETE_SEQUENCE, OVERLONG_SEQUENCE, INVALID_CODE_POINT};
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/// Helper for get_sequence_x
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template <typename octet_iterator>
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utf_error increase_safely(octet_iterator& it, octet_iterator end)
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{
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if (++it == end)
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return NOT_ENOUGH_ROOM;
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if (!utf8::internal::is_trail(*it))
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return INCOMPLETE_SEQUENCE;
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return UTF8_OK;
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}
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#define UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(IT, END) {utf_error ret = increase_safely(IT, END); if (ret != UTF8_OK) return ret;}
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/// get_sequence_x functions decode utf-8 sequences of the length x
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template <typename octet_iterator>
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utf_error get_sequence_1(octet_iterator& it, octet_iterator end, uint32_t& code_point)
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{
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if (it == end)
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return NOT_ENOUGH_ROOM;
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code_point = utf8::internal::mask8(*it);
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return UTF8_OK;
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}
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template <typename octet_iterator>
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utf_error get_sequence_2(octet_iterator& it, octet_iterator end, uint32_t& code_point)
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{
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if (it == end)
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return NOT_ENOUGH_ROOM;
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code_point = utf8::internal::mask8(*it);
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point = ((code_point << 6) & 0x7ff) + ((*it) & 0x3f);
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return UTF8_OK;
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}
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template <typename octet_iterator>
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utf_error get_sequence_3(octet_iterator& it, octet_iterator end, uint32_t& code_point)
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{
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if (it == end)
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return NOT_ENOUGH_ROOM;
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code_point = utf8::internal::mask8(*it);
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point = ((code_point << 12) & 0xffff) + ((utf8::internal::mask8(*it) << 6) & 0xfff);
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point += (*it) & 0x3f;
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return UTF8_OK;
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}
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template <typename octet_iterator>
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utf_error get_sequence_4(octet_iterator& it, octet_iterator end, uint32_t& code_point)
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{
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if (it == end)
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return NOT_ENOUGH_ROOM;
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code_point = utf8::internal::mask8(*it);
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point = ((code_point << 18) & 0x1fffff) + ((utf8::internal::mask8(*it) << 12) & 0x3ffff);
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point += (utf8::internal::mask8(*it) << 6) & 0xfff;
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point += (*it) & 0x3f;
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return UTF8_OK;
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}
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#undef UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR
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template <typename octet_iterator>
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utf_error validate_next(octet_iterator& it, octet_iterator end, uint32_t& code_point)
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{
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// Save the original value of it so we can go back in case of failure
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// Of course, it does not make much sense with i.e. stream iterators
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octet_iterator original_it = it;
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uint32_t cp = 0;
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// Determine the sequence length based on the lead octet
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typedef typename std::iterator_traits<octet_iterator>::difference_type octet_difference_type;
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const octet_difference_type length = utf8::internal::sequence_length(it);
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// Get trail octets and calculate the code point
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utf_error err = UTF8_OK;
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switch (length)
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{
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return (cp >= LEAD_SURROGATE_MIN && cp <= LEAD_SURROGATE_MAX);
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}
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case 0:
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return INVALID_LEAD;
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template <typename u16>
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inline bool is_trail_surrogate(u16 cp)
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{
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return (cp >= TRAIL_SURROGATE_MIN && cp <= TRAIL_SURROGATE_MAX);
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}
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template <typename u16>
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inline bool is_surrogate(u16 cp)
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{
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return (cp >= LEAD_SURROGATE_MIN && cp <= TRAIL_SURROGATE_MAX);
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}
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template <typename u32>
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inline bool is_code_point_valid(u32 cp)
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{
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return (cp <= CODE_POINT_MAX && !utf8::internal::is_surrogate(cp));
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}
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template <typename octet_iterator>
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inline typename std::iterator_traits<octet_iterator>::difference_type
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sequence_length(octet_iterator lead_it)
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{
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uint8_t lead = utf8::internal::mask8(*lead_it);
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if (lead < 0x80)
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return 1;
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else if ((lead >> 5) == 0x6)
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return 2;
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else if ((lead >> 4) == 0xe)
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return 3;
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else if ((lead >> 3) == 0x1e)
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return 4;
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else
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return 0;
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}
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template <typename octet_difference_type>
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inline bool is_overlong_sequence(uint32_t cp, octet_difference_type length)
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{
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if (cp < 0x80) {
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if (length != 1)
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return true;
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}
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else if (cp < 0x800) {
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if (length != 2)
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return true;
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}
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else if (cp < 0x10000) {
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if (length != 3)
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return true;
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}
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return false;
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}
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enum utf_error {UTF8_OK, NOT_ENOUGH_ROOM, INVALID_LEAD, INCOMPLETE_SEQUENCE, OVERLONG_SEQUENCE, INVALID_CODE_POINT};
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/// Helper for get_sequence_x
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template <typename octet_iterator>
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utf_error increase_safely(octet_iterator& it, octet_iterator end)
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{
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if (++it == end)
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return NOT_ENOUGH_ROOM;
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if (!utf8::internal::is_trail(*it))
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return INCOMPLETE_SEQUENCE;
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return UTF8_OK;
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}
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#define UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(IT, END) {utf_error ret = increase_safely(IT, END); if (ret != UTF8_OK) return ret;}
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/// get_sequence_x functions decode utf-8 sequences of the length x
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template <typename octet_iterator>
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utf_error get_sequence_1(octet_iterator& it, octet_iterator end, uint32_t& code_point)
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{
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if (it == end)
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return NOT_ENOUGH_ROOM;
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code_point = utf8::internal::mask8(*it);
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return UTF8_OK;
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}
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template <typename octet_iterator>
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utf_error get_sequence_2(octet_iterator& it, octet_iterator end, uint32_t& code_point)
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{
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if (it == end)
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return NOT_ENOUGH_ROOM;
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code_point = utf8::internal::mask8(*it);
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point = ((code_point << 6) & 0x7ff) + ((*it) & 0x3f);
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return UTF8_OK;
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}
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template <typename octet_iterator>
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utf_error get_sequence_3(octet_iterator& it, octet_iterator end, uint32_t& code_point)
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{
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if (it == end)
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return NOT_ENOUGH_ROOM;
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code_point = utf8::internal::mask8(*it);
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point = ((code_point << 12) & 0xffff) + ((utf8::internal::mask8(*it) << 6) & 0xfff);
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point += (*it) & 0x3f;
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return UTF8_OK;
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}
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template <typename octet_iterator>
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utf_error get_sequence_4(octet_iterator& it, octet_iterator end, uint32_t& code_point)
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{
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if (it == end)
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return NOT_ENOUGH_ROOM;
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code_point = utf8::internal::mask8(*it);
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point = ((code_point << 18) & 0x1fffff) + ((utf8::internal::mask8(*it) << 12) & 0x3ffff);
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point += (utf8::internal::mask8(*it) << 6) & 0xfff;
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UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR(it, end)
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code_point += (*it) & 0x3f;
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return UTF8_OK;
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}
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#undef UTF8_CPP_INCREASE_AND_RETURN_ON_ERROR
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template <typename octet_iterator>
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utf_error validate_next(octet_iterator& it, octet_iterator end, uint32_t& code_point)
|
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{
|
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// Save the original value of it so we can go back in case of failure
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// Of course, it does not make much sense with i.e. stream iterators
|
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octet_iterator original_it = it;
|
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|
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uint32_t cp = 0;
|
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// Determine the sequence length based on the lead octet
|
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typedef typename std::iterator_traits<octet_iterator>::difference_type octet_difference_type;
|
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const octet_difference_type length = utf8::internal::sequence_length(it);
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// Get trail octets and calculate the code point
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utf_error err = UTF8_OK;
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switch (length) {
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case 0:
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return INVALID_LEAD;
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case 1:
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err = utf8::internal::get_sequence_1(it, end, cp);
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break;
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case 2:
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err = utf8::internal::get_sequence_2(it, end, cp);
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case 1:
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err = utf8::internal::get_sequence_1(it, end, cp);
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break;
|
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case 3:
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err = utf8::internal::get_sequence_3(it, end, cp);
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break;
|
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case 4:
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err = utf8::internal::get_sequence_4(it, end, cp);
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break;
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}
|
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if (err == UTF8_OK) {
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// Decoding succeeded. Now, security checks...
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if (utf8::internal::is_code_point_valid(cp)) {
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if (!utf8::internal::is_overlong_sequence(cp, length)){
|
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// Passed! Return here.
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code_point = cp;
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||||
++it;
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return UTF8_OK;
|
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}
|
||||
else
|
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err = OVERLONG_SEQUENCE;
|
||||
case 2:
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||||
err = utf8::internal::get_sequence_2(it, end, cp);
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break;
|
||||
|
||||
case 3:
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||||
err = utf8::internal::get_sequence_3(it, end, cp);
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||||
break;
|
||||
|
||||
case 4:
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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
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||||
err = INVALID_CODE_POINT;
|
||||
else
|
||||
err = OVERLONG_SEQUENCE;
|
||||
}
|
||||
|
||||
// Failure branch - restore the original value of the iterator
|
||||
it = original_it;
|
||||
return err;
|
||||
else
|
||||
err = INVALID_CODE_POINT;
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
// 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
|
||||
/// The library API - functions intended to be called by the users
|
||||
|
||||
// Byte order mark
|
||||
const uint8_t bom[] = {0xef, 0xbb, 0xbf};
|
||||
// Byte order mark
|
||||
const uint8_t bom[] = {0xef, 0xbb, 0xbf};
|
||||
|
||||
template <typename octet_iterator>
|
||||
octet_iterator find_invalid(octet_iterator start, octet_iterator end)
|
||||
template <typename octet_iterator>
|
||||
octet_iterator find_invalid(octet_iterator start, octet_iterator end)
|
||||
{
|
||||
octet_iterator result = start;
|
||||
|
||||
while (result != 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;
|
||||
utf8::internal::utf_error err_code = utf8::internal::validate_next(result, end);
|
||||
|
||||
if (err_code != internal::UTF8_OK)
|
||||
return result;
|
||||
}
|
||||
|
||||
template <typename octet_iterator>
|
||||
inline bool is_valid(octet_iterator start, octet_iterator end)
|
||||
{
|
||||
return (utf8::find_invalid(start, end) == end);
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
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])
|
||||
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]
|
||||
}
|
||||
|
||||
//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
|
||||
|
||||
Reference in New Issue
Block a user