/usr/include/pegtl/internal/peek_utf16.hh is in pegtl-dev 1.3.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | // Copyright (c) 2014-2015 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/ColinH/PEGTL/
#ifndef PEGTL_INTERNAL_PEEK_UTF16_HH
#define PEGTL_INTERNAL_PEEK_UTF16_HH
#include <type_traits>
#include "input_pair.hh"
namespace pegtl
{
namespace internal
{
struct peek_utf16
{
using data_t = char32_t;
using pair_t = input_pair< char32_t >;
using short_t = std::make_unsigned< char16_t >::type;
static_assert( sizeof( short_t ) == 2, "expected size 2 for 16bit value" );
static_assert( sizeof( char16_t ) == 2, "expected size 2 for 16bit value" );
template< typename Input >
static pair_t peek( Input & in )
{
const std::size_t s = in.size();
if ( s >= 2 ) {
const char32_t t = * reinterpret_cast< const short_t * >( in.begin() );
if ( ( t < 0xd800 ) || ( t > 0xdbff ) || ( s < 4 ) ) {
return { t, 2 };
}
const char32_t u = * reinterpret_cast< const short_t * >( in.begin() + 2 );
if ( ( u < 0xdc00 ) || ( u > 0xdfff ) ) {
return { t, 2 };
}
return { ( ( ( t & 0x03ff ) << 10 ) | ( u & 0x03ff ) ) + 0x10000, 4 };
}
return { 0, 0 };
}
};
} // internal
} // pegtl
#endif
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