static bool skipUTF8MultiByte()

in source/core_json.c [186:238]

• 39 lines of code
• 10 McCabe index (conditional complexity)

static bool skipUTF8MultiByte( const char * buf,
                               size_t * start,
                               size_t max )
{
    bool ret = false;
    size_t i, bitCount, j;
    uint32_t value = 0;
    char_ c;

    assert( ( buf != NULL ) && ( start != NULL ) && ( max > 0U ) );

    i = *start;
    assert( i < max );
    assert( !isascii_( buf[ i ] ) );

    c.c = buf[ i ];

    if( ( c.u > 0xC1U ) && ( c.u < 0xF5U ) )
    {
        bitCount = countHighBits( c.u );
        value = ( ( uint32_t ) c.u ) & ( ( ( uint32_t ) 1 << ( 7U - bitCount ) ) - 1U );

        /* The bit count is 1 greater than the number of bytes,
         * e.g., when j is 2, we skip one more byte. */
        for( j = bitCount - 1U; j > 0U; j-- )
        {
            i++;

            if( i >= max )
            {
                break;
            }

            c.c = buf[ i ];

            /* Additional bytes must match 10xxxxxx. */
            if( ( c.u & 0xC0U ) != 0x80U )
            {
                break;
            }

            value = ( value << 6U ) | ( c.u & 0x3FU );
        }

        if( ( j == 0U ) && ( shortestUTF8( bitCount, value ) == true ) )
        {
            *start = i + 1U;
            ret = true;
        }
    }

    return ret;
}