2 * Copyright (c) 2015 Samsung Electronics Co., Ltd.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include <dali-toolkit/internal/text/character-set-conversion.h>
32 const static uint8_t U1 = 1u;
33 const static uint8_t U2 = 2u;
34 const static uint8_t U3 = 3u;
35 const static uint8_t U4 = 4u;
36 const static uint8_t U0 = 0u;
37 const static uint8_t UTF8_LENGTH[256] = {
38 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
39 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
40 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
41 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
42 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
43 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
44 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
45 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
46 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, // lead byte = 0xxx xxxx (U+0000 - U+007F + some extended ascii characters)
47 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
48 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
49 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
50 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
51 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
52 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
53 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
54 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
55 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
56 U1, U1, U1, U1, U1, U1, U1, U1, U1, U1, //
59 U2, U2, U2, U2, U2, U2, U2, U2, U2, U2, //
60 U2, U2, U2, U2, U2, U2, U2, U2, U2, U2, // lead byte = 110x xxxx (U+0080 - U+07FF)
61 U2, U2, U2, U2, U2, U2, U2, U2, U2, U2, //
64 U3, U3, U3, U3, U3, U3, U3, U3, U3, U3, // lead byte = 1110 xxxx (U+0800 - U+FFFF)
65 U3, U3, U3, U3, U3, U3, //
67 U4, U4, U4, U4, U4, U4, U4, U4, // lead byte = 1111 0xxx (U+10000 - U+1FFFFF)
69 U0, U0, U0, U0, // Non valid.
70 U0, U0, U0, U0, // Non valid.
74 uint32_t GetNumberOfUtf8Characters( const uint8_t* const utf8, uint32_t length )
76 uint32_t numberOfCharacters = 0u;
78 const uint8_t* begin = utf8;
79 const uint8_t* end = utf8 + length;
81 for( ; begin < end ; begin += UTF8_LENGTH[*begin], ++numberOfCharacters );
83 return numberOfCharacters;
86 uint32_t GetNumberOfUtf8Bytes( const uint32_t* const utf32, uint32_t numberOfCharacters )
88 uint32_t numberOfBytes = 0u;
90 const uint32_t* begin = utf32;
91 const uint32_t* end = utf32 + numberOfCharacters;
93 for( ; begin < end; ++begin )
95 const uint32_t code = *begin;
101 else if( code < 0x800u )
105 else if( code < 0x10000u )
109 else if( code < 0x200000u )
115 return numberOfBytes;
118 uint32_t Utf8ToUtf32( const uint8_t* const utf8, uint32_t length, uint32_t* utf32 )
120 uint32_t numberOfCharacters = 0u;
122 const uint8_t* begin = utf8;
123 const uint8_t* end = utf8 + length;
125 for( ; begin < end ; ++numberOfCharacters )
127 const uint8_t leadByte = *begin;
129 switch( UTF8_LENGTH[leadByte] )
140 uint32_t& code = *utf32++;
141 code = leadByte & 0x1fu;
144 code |= *begin++ & 0x3fu;
150 uint32_t& code = *utf32++;
151 code = leadByte & 0x0fu;
154 code |= *begin++ & 0x3fu;
156 code |= *begin++ & 0x3fu;
162 uint32_t& code = *utf32++;
163 code = leadByte & 0x07u;
166 code |= *begin++ & 0x3fu;
168 code |= *begin++ & 0x3fu;
170 code |= *begin++ & 0x3fu;
176 return numberOfCharacters;
179 uint32_t Utf32ToUtf8( const uint32_t* const utf32, uint32_t numberOfCharacters, uint8_t* utf8 )
181 const uint32_t* begin = utf32;
182 const uint32_t* end = utf32 + numberOfCharacters;
184 uint8_t* utf8Begin = utf8;
186 for( ; begin < end; ++begin )
188 const uint32_t code = *begin;
194 else if( code < 0x800u )
196 *utf8++ = static_cast<uint8_t>( code >> 6u ) | 0xc0u; // lead byte for 2 byte sequence
197 *utf8++ = static_cast<uint8_t>( code & 0x3f ) | 0x80u; // continuation byte
199 else if( code < 0x10000u )
201 *utf8++ = static_cast<uint8_t>( code >> 12u ) | 0xe0u; // lead byte for 2 byte sequence
202 *utf8++ = static_cast<uint8_t>( ( code >> 6u ) & 0x3f ) | 0x80u; // continuation byte
203 *utf8++ = static_cast<uint8_t>( code & 0x3f ) | 0x80u; // continuation byte
205 else if( code < 0x200000u )
207 *utf8++ = static_cast<uint8_t>( code >> 18u ) | 0xf0u; // lead byte for 2 byte sequence
208 *utf8++ = static_cast<uint8_t>( ( code >> 12u ) & 0x3f ) | 0x80u; // continuation byte
209 *utf8++ = static_cast<uint8_t>( ( code >> 6u ) & 0x3f ) | 0x80u; // continuation byte
210 *utf8++ = static_cast<uint8_t>( code & 0x3f ) | 0x80u; // continuation byte
214 return utf8 - utf8Begin;
217 void Utf32ToUtf8( const uint32_t* const utf32, uint32_t numberOfCharacters, std::string& utf8 )
221 uint32_t numberOfBytes = GetNumberOfUtf8Bytes( &utf32[0], numberOfCharacters );
222 utf8.resize( numberOfBytes );
224 // This is a bit horrible but std::string returns a (signed) char*
225 Utf32ToUtf8( utf32, numberOfCharacters, reinterpret_cast<uint8_t*>(&utf8[0]) );
230 } // namespace Toolkit