489 lines
18 KiB
C++
489 lines
18 KiB
C++
// Copyright (c) 2006 Nemanja Trifunovic
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/*
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifndef UTF8_FOR_CPP_2675DCD0_9480_4c0c_B92A_CC14C027B731
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#define UTF8_FOR_CPP_2675DCD0_9480_4c0c_B92A_CC14C027B731
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#include <iterator>
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#include <exception>
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namespace utf8
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{
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// The typedefs for 8-bit, 16-bit and 32-bit unsigned integers
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// You may need to change them to match your system.
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// These typedefs have the same names as ones from cstdint, or boost/cstdint
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typedef unsigned char uint8_t;
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typedef unsigned short uint16_t;
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typedef unsigned int uint32_t;
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// Exceptions that may be thrown from the library functions.
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class invalid_code_point : public std::exception {
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uint32_t cp;
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public:
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invalid_code_point(uint32_t cp) : cp(cp) {}
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const char* what() { return "Invalid code point"; }
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uint32_t code_point() const {return cp;}
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};
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class invalid_utf8 : public std::exception {
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uint8_t u8;
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public:
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invalid_utf8 (uint8_t u) : u8(u) {}
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const char* what() { return "Invalid UTF-8"; }
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uint8_t utf8_octet() const {return u8;}
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};
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class invalid_utf16 : public std::exception {
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uint16_t u16;
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public:
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invalid_utf16 (uint16_t u) : u16(u) {}
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const char* what() { return "Invalid UTF-16"; }
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uint16_t utf16_word() const {return u16;}
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};
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class not_enough_room : public std::exception {
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public:
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const char* what() { return "Not enough space"; }
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};
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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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// 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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{
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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 ((mask8(oc) >> 6) == 0x2);
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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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enum utf_error {OK, NOT_ENOUGH_ROOM, INVALID_LEAD, INCOMPLETE_SEQUENCE, OVERLONG_SEQUENCE, INVALID_CODE_POINT};
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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 = 0)
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{
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uint32_t cp = mask8(*it);
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// Check the lead octet
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size_t sequence_length;
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if (cp < 80)
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sequence_length = 1;
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else if ((cp >> 5) == 0x6)
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sequence_length = 2;
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else if ((cp >> 4) == 0xe)
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sequence_length = 3;
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else if ((cp >> 3) == 0x1e)
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sequence_length = 4;
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else
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return INVALID_LEAD;
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// Do we have enough memory?
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if (size_t(end - it) < sequence_length)
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return NOT_ENOUGH_ROOM;
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// Check trail octets and calculate the code point
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switch (sequence_length) {
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case 2:
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if (is_trail(*(++it))) {
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cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);
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}
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else
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return INCOMPLETE_SEQUENCE;
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break;
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case 3:
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if (is_trail(*(++it))) {
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cp = ((cp << 12) & 0xffff) + ((mask8(*it) << 6) & 0xfff);
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if (is_trail(*(++it))) {
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cp += (*it) & 0x3f;
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}
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else
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return INCOMPLETE_SEQUENCE;
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}
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else
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return INCOMPLETE_SEQUENCE;
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break;
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case 4:
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if (is_trail(*(++it))) {
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cp = ((cp << 18) & 0x1fffff) + (mask8(*it) << 12) & 0x3ffff;
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if (is_trail(*(++it))) {
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cp += (mask8(*it) << 6) & 0xfff;
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if (is_trail(*(++it))) {
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cp += (*it) & 0x3f;
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}
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else
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return INCOMPLETE_SEQUENCE;
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}
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else
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return INCOMPLETE_SEQUENCE;
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}
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else
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return INCOMPLETE_SEQUENCE;
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break;
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}
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// Is the code point valid?
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if (cp > CODE_POINT_MAX || is_surrogate(cp) || mask8(cp) == 0xff || mask8(cp) == 0xfe)
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return INVALID_CODE_POINT;
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if (code_point)
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*code_point = cp;
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// Overlong sequence?
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if (cp < 0x80) {
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if (sequence_length != 1)
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return OVERLONG_SEQUENCE;
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}
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else if (cp < 0x800) {
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if (sequence_length != 2)
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return OVERLONG_SEQUENCE;
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}
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else if (cp < 0x10000) {
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if (sequence_length != 3)
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return OVERLONG_SEQUENCE;
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}
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++it;
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return OK;
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}
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} // namespace internal
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/// The library API - functions intended to be called by the users
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// Byte order mark
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const uint8_t bom[] = {0xef, 0xbb, 0xbf};
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template <typename octet_iterator>
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octet_iterator find_invalid(octet_iterator start, octet_iterator end)
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{
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octet_iterator result = start;
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while (result != end) {
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internal::utf_error err_code = internal::validate_next(result, end);
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if (err_code != internal::OK)
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return result;
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}
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return result;
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}
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template <typename octet_iterator>
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bool is_valid(octet_iterator start, octet_iterator end)
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{
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return (find_invalid(start, end) == end);
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}
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template <typename octet_iterator>
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bool is_bom (octet_iterator it)
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{
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return (
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(internal::mask8(*it++)) == bom[0] &&
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(internal::mask8(*it++)) == bom[1] &&
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(internal::mask8(*it)) == bom[2]
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);
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}
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template <typename octet_iterator>
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octet_iterator append(uint32_t cp, octet_iterator result)
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{
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if (cp < 0x80) // one octet
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*(result++) = static_cast<uint8_t>(cp);
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else if (cp < 0x800) { // two octets
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if (internal::is_surrogate(cp))
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throw invalid_code_point(cp);
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*(result++) = static_cast<uint8_t>((cp >> 6) | 0xc0);
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*(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
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}
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else if (cp < 0x10000) { // three octets
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*(result++) = static_cast<uint8_t>((cp >> 12) | 0xe0);
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*(result++) = static_cast<uint8_t>((cp >> 6) | 0x80);
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*(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
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}
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else if (cp <= internal::CODE_POINT_MAX) { // four octets
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*(result++) = static_cast<uint8_t>((cp >> 18) | 0xf0);
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*(result++) = static_cast<uint8_t>((cp >> 12) | 0x80);
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*(result++) = static_cast<uint8_t>((cp >> 6) | 0x80);
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*(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
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}
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else
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throw invalid_code_point(cp);
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return result;
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}
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template <typename octet_iterator>
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uint32_t next(octet_iterator& it, octet_iterator end)
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{
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uint32_t cp = 0;
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internal::utf_error err_code = internal::validate_next(it, end, &cp);
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switch (err_code) {
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case internal::OK :
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break;
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case internal::NOT_ENOUGH_ROOM :
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throw not_enough_room();
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case internal::INVALID_LEAD :
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case internal::INCOMPLETE_SEQUENCE :
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case internal::OVERLONG_SEQUENCE :
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throw invalid_utf8(*it);
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case internal::INVALID_CODE_POINT :
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throw invalid_code_point(cp);
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}
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return cp;
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}
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template <typename octet_iterator>
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uint32_t previous(octet_iterator& it, octet_iterator pass_start)
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{
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octet_iterator end = it;
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while (internal::is_trail(*(--it)))
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if (it == pass_start)
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throw invalid_utf8(*it); // error - no lead byte in the sequence
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octet_iterator temp = it;
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return next(temp, end);
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}
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template <typename octet_iterator, typename distance_type>
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void advance (octet_iterator& it, distance_type n, octet_iterator end)
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{
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for (distance_type i = 0; i < n; ++i)
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next(it, end);
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}
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template <typename octet_iterator>
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typename std::iterator_traits<octet_iterator>::difference_type
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distance (octet_iterator first, octet_iterator last)
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{
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typename std::iterator_traits<octet_iterator>::difference_type dist;
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for (dist = 0; first < last; ++dist)
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next(first, last);
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return dist;
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}
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template <typename u16bit_iterator, typename octet_iterator>
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void utf16to8 (u16bit_iterator start, u16bit_iterator end, octet_iterator result)
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{
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while (start != end) {
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uint32_t cp = internal::mask16(*start++);
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// Take care of surrogate pairs first
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if (cp >= internal::LEAD_SURROGATE_MIN && cp <= internal::LEAD_SURROGATE_MAX) {
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if (start != end) {
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uint32_t trail_surrogate = internal::mask16(*start++);
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if (trail_surrogate >= internal::TRAIL_SURROGATE_MIN && trail_surrogate <= internal::TRAIL_SURROGATE_MAX)
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cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
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else
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throw invalid_utf16(static_cast<uint16_t>(trail_surrogate));
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}
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else
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throw invalid_utf16(static_cast<uint16_t>(*start));
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}
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*result = append(cp, result);
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}
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}
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template <typename u16bit_iterator, typename octet_iterator>
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void utf8to16 (octet_iterator start, octet_iterator end, u16bit_iterator result)
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{
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while (start != end) {
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uint32_t cp = next(start, end);
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if (cp > 0xffff) { //make a surrogate pair
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*result++ = static_cast<uint16_t>((cp >> 10) + internal::LEAD_OFFSET);
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*result++ = static_cast<uint16_t>((cp & 0x3ff) + internal::TRAIL_SURROGATE_MIN);
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}
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else
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*result++ = static_cast<uint16_t>(cp);
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}
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}
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template <typename octet_iterator, typename u32bit_iterator>
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void utf32to8 (u32bit_iterator start, u32bit_iterator end, octet_iterator result)
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{
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while (start != end)
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*result = append(*(start++), result);
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}
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template <typename octet_iterator, typename u32bit_iterator>
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void utf8to32 (octet_iterator start, octet_iterator end, u32bit_iterator result)
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{
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while (start < end)
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(*result++) = next(start, end);
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}
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namespace unchecked
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{
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template <typename octet_iterator>
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octet_iterator append(uint32_t cp, octet_iterator result)
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{
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if (cp < 0x80) // one octet
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*(result++) = static_cast<uint8_t>(cp);
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else if (cp < 0x800) { // two octets
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*(result++) = static_cast<uint8_t>((cp >> 6) | 0xc0);
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*(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
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}
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else if (cp < 0x10000) { // three octets
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*(result++) = static_cast<uint8_t>((cp >> 12) | 0xe0);
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*(result++) = static_cast<uint8_t>((cp >> 6) | 0x80);
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*(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
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}
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else { // four octets
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*(result++) = static_cast<uint8_t>((cp >> 18) | 0xf0);
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*(result++) = static_cast<uint8_t>((cp >> 12) | 0x80);
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*(result++) = static_cast<uint8_t>((cp >> 6) | 0x80);
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*(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
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}
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return result;
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}
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template <typename octet_iterator>
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uint32_t next(octet_iterator& it)
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{
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uint32_t cp = internal::mask8(*it);
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if (cp < 0x80)
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;
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else if ((internal::mask8(*it) >> 5) == 0x6) {
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it++;
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cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);
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}
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else if ((internal::mask8(*it) >> 4) == 0xe) {
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++it;
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cp = ((cp << 12) & 0xffff) + ((internal::mask8(*it) << 6) & 0xfff);
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++it;
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cp += (*it) & 0x3f;
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}
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else if (((*it) >> 3) == 0x1e) {
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++it;
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cp = ((cp << 18) & 0x1fffff) + (internal::mask8(*it) << 12) & 0x3ffff;
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++it;
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cp += (internal::mask8(*it) << 6) & 0xfff;
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++it;
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cp += (*it) & 0x3f;
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}
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++it;
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return cp;
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}
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template <typename octet_iterator>
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uint32_t previous(octet_iterator& it)
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{
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while (internal::is_trail(*(--it))) ;
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octet_iterator temp = it;
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return next(temp);
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}
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template <typename octet_iterator, typename distance_type>
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void advance (octet_iterator& it, distance_type n)
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{
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for (distance_type i = 0; i < n; ++i)
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next(it);
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}
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template <typename octet_iterator>
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uint32_t get(octet_iterator it)
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{
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return next(it);
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}
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template <typename octet_iterator>
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typename std::iterator_traits<octet_iterator>::difference_type
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distance (octet_iterator first, octet_iterator last)
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{
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typename std::iterator_traits<octet_iterator>::difference_type dist;
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for (dist = 0; first < last; ++dist)
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next(first);
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return dist;
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}
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template <typename u16bit_iterator, typename octet_iterator>
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void utf16to8 (u16bit_iterator start, u16bit_iterator end, octet_iterator result)
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{
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while (start != end) {
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uint32_t cp = internal::mask16(*start++);
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// Take care of surrogate pairs first
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if (cp >= internal::LEAD_SURROGATE_MIN && cp <= internal::LEAD_SURROGATE_MAX) {
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uint32_t trail_surrogate = internal::mask16(*start++);
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cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
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}
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*result = append(cp, result);
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}
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}
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template <typename u16bit_iterator, typename octet_iterator>
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void utf8to16 (octet_iterator start, octet_iterator end, u16bit_iterator result)
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{
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while (start != end) {
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uint32_t cp = next(start);
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if (cp > 0xffff) { //make a surrogate pair
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*result++ = static_cast<uint16_t>((cp >> 10) + internal::LEAD_OFFSET);
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*result++ = static_cast<uint16_t>((cp & 0x3ff) + internal::TRAIL_SURROGATE_MIN);
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}
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else
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*result++ = static_cast<uint16_t>(cp);
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}
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}
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template <typename octet_iterator, typename u32bit_iterator>
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void utf32to8 (u32bit_iterator start, u32bit_iterator end, octet_iterator result)
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{
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while (start != end)
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*result = append(*(start++), result);
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}
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template <typename octet_iterator, typename u32bit_iterator>
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void utf8to32 (octet_iterator start, octet_iterator end, u32bit_iterator result)
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{
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while (start < end)
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(*result++) = next(start);
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}
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} // namespace utf8::unchecked
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} // namespace utf8
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#endif // header guard
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