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93 lines
3.4 KiB
C++
93 lines
3.4 KiB
C++
// Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
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// See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.
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//
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// Copyright(c) 2016 YamaArashi
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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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 AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#include <cstdint>
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#include "utf8.h"
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static const unsigned char s_byteTypeTable[] =
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{
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 00..1f
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 20..3f
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 40..5f
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, // 60..7f
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1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9, // 80..9f
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, // a0..bf
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8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, // c0..df
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0xa,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x3,0x4,0x3,0x3, // e0..ef
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0xb,0x6,0x6,0x6,0x5,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8,0x8, // f0..ff
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};
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const unsigned char s0 = 0 * 12;
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const unsigned char s1 = 1 * 12;
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const unsigned char s2 = 2 * 12;
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const unsigned char s3 = 3 * 12;
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const unsigned char s4 = 4 * 12;
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const unsigned char s5 = 5 * 12;
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const unsigned char s6 = 6 * 12;
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const unsigned char s7 = 7 * 12;
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const unsigned char s8 = 8 * 12;
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static const unsigned char s_transitionTable[] =
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{
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s0,s1,s2,s3,s5,s8,s7,s1,s1,s1,s4,s6, // s0
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s1,s1,s1,s1,s1,s1,s1,s1,s1,s1,s1,s1, // s1
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s1,s0,s1,s1,s1,s1,s1,s0,s1,s0,s1,s1, // s2
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s1,s2,s1,s1,s1,s1,s1,s2,s1,s2,s1,s1, // s3
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s1,s1,s1,s1,s1,s1,s1,s2,s1,s1,s1,s1, // s4
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s1,s2,s1,s1,s1,s1,s1,s1,s1,s2,s1,s1, // s5
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s1,s1,s1,s1,s1,s1,s1,s3,s1,s3,s1,s1, // s6
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s1,s3,s1,s1,s1,s1,s1,s3,s1,s3,s1,s1, // s7
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s1,s3,s1,s1,s1,s1,s1,s1,s1,s1,s1,s1, // s8
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};
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// Decodes UTF-8 encoded Unicode code point at "s".
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UnicodeChar DecodeUtf8(const char* s)
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{
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UnicodeChar unicodeChar;
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int state = s0;
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auto start = s;
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do
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{
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unsigned char byte = *s++;
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int type = s_byteTypeTable[byte];
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if (state == s0)
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unicodeChar.code = (0xFF >> type) & byte;
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else
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unicodeChar.code = (unicodeChar.code << 6) | (byte & 0x3F);
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state = s_transitionTable[state + type];
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if (state == s1)
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{
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unicodeChar.code = -1;
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return unicodeChar;
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}
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} while (state != s0);
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unicodeChar.encodingLength = s - start;
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return unicodeChar;
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}
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