utf_convfrom_char.c

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/* ascii to UTF conversion */

#include "fb.h"

static char *hToUTF8( const char *src, ssize_t chars, char *dst, ssize_t *bytes )
{
        if( chars > 0 )
        {
                if( dst == NULL )
                {
                        dst = malloc( chars * 2 );
                        if( dst == NULL )
                                return NULL;
                }

                fb_hCharToUTF8( src, chars, dst, bytes );
        }
        else
                *bytes = 0;

        return dst;
}

static char *hToUTF16( const char *src, ssize_t chars, char *dst, ssize_t *bytes )
{
        UTF_16 *p;

        /* !!!FIXME!!! only litle-endian supported */

        *bytes = chars * sizeof( UTF_16 );

        if( chars > 0 )
        {
                if( dst == NULL )
                {
                        dst = malloc( chars * sizeof( UTF_16 ) );
                        if( dst == NULL )
                                return NULL;
                }
        }

        p = (UTF_16 *)dst;
        while( chars > 0 )
        {
                *p++ = (unsigned char)*src++;
                --chars;
        }

        return dst;
}

static char *hToUTF32( const char *src, ssize_t chars, char *dst, ssize_t *bytes )
{
        UTF_32 *p;

        /* !!!FIXME!!! only litle-endian supported */

        *bytes = chars * sizeof( UTF_32 );

        if( chars > 0 )
        {
                if( dst == NULL )
                {
                        dst = malloc( chars * sizeof( UTF_32 ) );
                        if( dst == NULL )
                                return NULL;
                }
        }

        p = (UTF_32 *)dst;
        while( chars > 0 )
        {
                *p++ = (unsigned char)*src++;
                --chars;
        }

        return dst;
}

char *fb_CharToUTF
        (
                FB_FILE_ENCOD encod,
                const char *src,
                ssize_t chars,
                char *dst,
                ssize_t *bytes
        )
{
        switch( encod )
        {
        case FB_FILE_ENCOD_UTF8:
                return hToUTF8( src, chars, dst, bytes );

        case FB_FILE_ENCOD_UTF16:
                return hToUTF16( src, chars, dst, bytes );

        case FB_FILE_ENCOD_UTF32:
                return hToUTF32( src, chars, dst, bytes );

        default:
                return NULL;
        }
}