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utf8-utils.c
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utf8-utils.c
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/* =========================================================================
* Freetype GL - A C OpenGL Freetype engine
* Platform: Any
* WWW: https://github.com/rougier/freetype-gl
* -------------------------------------------------------------------------
* Copyright 2011,2012 Nicolas P. Rougier. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NICOLAS P. ROUGIER ''AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL NICOLAS P. ROUGIER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are
* those of the authors and should not be interpreted as representing official
* policies, either expressed or implied, of Nicolas P. Rougier.
* ========================================================================= */
#include <string.h>
#include "utf8-utils.h"
// ----------------------------------------------------- utf8_surrogate_len ---
size_t
utf8_surrogate_len( const char* character )
{
size_t result = 0;
char test_char;
if (!character)
return 0;
test_char = character[0];
if ((test_char & 0x80) == 0)
return 1;
while (test_char & 0x80)
{
test_char <<= 1;
result++;
}
return result;
}
// ------------------------------------------------------------ utf8_strlen ---
size_t
utf8_strlen( const char* string )
{
const char* ptr = string;
size_t result = 0;
while (*ptr)
{
ptr += utf8_surrogate_len(ptr);
result++;
}
return result;
}
uint32_t
utf8_to_utf32( const char * character )
{
uint32_t result = -1;
if( !character )
{
return result;
}
if( ( character[0] & 0x80 ) == 0x0 )
{
result = character[0];
}
if( ( character[0] & 0xC0 ) == 0xC0 )
{
result = ( ( character[0] & 0x3F ) << 6 ) | ( character[1] & 0x3F );
}
if( ( character[0] & 0xE0 ) == 0xE0 )
{
result = ( ( character[0] & 0x1F ) << ( 6 + 6 ) ) | ( ( character[1] & 0x3F ) << 6 ) | ( character[2] & 0x3F );
}
if( ( character[0] & 0xF0 ) == 0xF0 )
{
result = ( ( character[0] & 0x0F ) << ( 6 + 6 + 6 ) ) | ( ( character[1] & 0x3F ) << ( 6 + 6 ) ) | ( ( character[2] & 0x3F ) << 6 ) | ( character[3] & 0x3F );
}
if( ( character[0] & 0xF8 ) == 0xF8 )
{
result = ( ( character[0] & 0x07 ) << ( 6 + 6 + 6 + 6 ) ) | ( ( character[1] & 0x3F ) << ( 6 + 6 + 6 ) ) | ( ( character[2] & 0x3F ) << ( 6 + 6 ) ) | ( ( character[3] & 0x3F ) << 6 ) | ( character[4] & 0x3F );
}
return result;
}