utf_core.c

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/* wstring to UTF conversion
 * (based on ConvertUTF.c free implementation from Unicode, Inc)
 */

#include "fb.h"

const UTF_8 __fb_utf8_bmarkTb[7] = 
        { 
                0x00, 0x00, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC        
        };

const char __fb_utf8_trailingTb[256] =
        {
                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,
                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,
                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,
                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,
                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,
                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,
                1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
                2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,4,4,4,4,5,5,5,5
        };

const UTF_32 __fb_utf8_offsetsTb[6] =
        {
                0x00000000UL, 0x00003080UL, 0x000E2080UL, 0x03C82080UL, 0xFA082080UL, 0x82082080UL
        };

void fb_hCharToUTF8( const char *src, ssize_t chars, char *dst, ssize_t *total_bytes )
{
        UTF_8 c;

        *total_bytes = 0;
        while( chars > 0 )
        {
                c = *src++;
                if( c < 0x80 )
                {
                        *dst++ = c;
                        *total_bytes += 1;
                }
                else
                {
                        *dst++ = 0xC0 | (c >> 6);
                        *dst++ = ((c | UTF8_BYTEMARK) & UTF8_BYTEMASK);
                        *total_bytes += 2;
                }

                --chars;
        }
}