sal/textenc/unichars.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
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  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_SAL_TEXTENC_UNICHARS_HXX
  21 #define INCLUDED_SAL_TEXTENC_UNICHARS_HXX
  22
  23 #include <sal/config.h>
  24
  25 #include <cassert>
  26
  27 #include <rtl/character.hxx>
  28 #include <sal/types.h>
  29
  30 #define RTL_TEXTENC_UNICODE_REPLACEMENT_CHARACTER 0xFFFD
  31
  32 inline bool ImplIsNoncharacter(sal_uInt32 nUtf32)
  33 {
  34     return (nUtf32 >= 0xFDD0 && nUtf32 <= 0xFDEF)
  35            || (nUtf32 & 0xFFFF) >= 0xFFFE
  36            || !rtl::isUnicodeCodePoint(nUtf32);
  37 }
  38     // All code points that are noncharacters, as of Unicode 3.1.1.
  39
  40 bool ImplIsControlOrFormat(sal_uInt32 nUtf32);
  41
  42 inline bool ImplIsHighSurrogate(sal_uInt32 nUtf32)
  43 { return nUtf32 >= 0xD800 && nUtf32 <= 0xDBFF; }
  44     // All code points that are high-surrogates, as of Unicode 3.1.1.
  45
  46 inline bool ImplIsLowSurrogate(sal_uInt32 nUtf32)
  47 { return nUtf32 >= 0xDC00 && nUtf32 <= 0xDFFF; }
  48     // All code points that are low-surrogates, as of Unicode 3.1.1.
  49
  50 bool ImplIsPrivateUse(sal_uInt32 nUtf32);
  51
  52 bool ImplIsZeroWidth(sal_uInt32 nUtf32);
  53
  54 inline sal_uInt32 ImplGetHighSurrogate(sal_uInt32 nUtf32)
  55 {
  56     assert(nUtf32 >= 0x10000);
  57     return ((nUtf32 - 0x10000) >> 10) | 0xD800;
  58 }
  59
  60 inline sal_uInt32 ImplGetLowSurrogate(sal_uInt32 nUtf32)
  61 {
  62     assert(nUtf32 >= 0x10000);
  63     return ((nUtf32 - 0x10000) & 0x3FF) | 0xDC00;
  64 }
  65
  66 inline sal_uInt32 ImplCombineSurrogates(sal_uInt32 nHigh, sal_uInt32 nLow)
  67 {
  68     assert(ImplIsHighSurrogate(nHigh) && ImplIsLowSurrogate(nLow));
  69     return (((nHigh & 0x3FF) << 10) | (nLow & 0x3FF)) + 0x10000;
  70 }
  71
  72 #endif
  73
  74 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */