vcl/source/fontsubset/xlat.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  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 #include <rtl/textcvt.h>
  21 #include "xlat.hxx"
  22
  23 namespace {
  24
  25 #define MAX_CVT_SELECT 6
  26
  27 class ConverterCache
  28 {
  29 public:
  30     explicit    ConverterCache();
  31                 ~ConverterCache();
  32     sal_uInt16  convertOne( int nSelect, sal_Unicode );
  33 private:
  34     void        ensureConverter( int nSelect );
  35     rtl_UnicodeToTextConverter maConverterCache[ MAX_CVT_SELECT+1 ];
  36     rtl_UnicodeToTextContext maContexts[ MAX_CVT_SELECT+1 ];
  37 };
  38
  39 ConverterCache::ConverterCache()
  40 {
  41     for( int i = 0; i <= MAX_CVT_SELECT; ++i)
  42     {
  43         maConverterCache[i] = nullptr;
  44         maContexts[i] = nullptr;
  45     }
  46 }
  47
  48 ConverterCache::~ConverterCache()
  49 {
  50     for( int i = 0; i <= MAX_CVT_SELECT; ++i)
  51     {
  52         if( !maContexts[i] )
  53             continue;
  54         rtl_destroyUnicodeToTextContext( maConverterCache[i], maContexts[i] );
  55         rtl_destroyUnicodeToTextConverter( maConverterCache[i] );
  56     }
  57 }
  58
  59 void ConverterCache::ensureConverter( int nSelect )
  60 {
  61     // SAL_WARN_IF( (2>nSelect) || (nSelect>MAX_CVT_SELECT)), "vcl", "invalid XLAT.Converter requested" );
  62     rtl_UnicodeToTextContext aContext = maContexts[ nSelect ];
  63     if( !aContext )
  64     {
  65         rtl_TextEncoding eRecodeFrom = RTL_TEXTENCODING_UNICODE;
  66         switch( nSelect )
  67         {
  68             default: nSelect = 1; [[fallthrough]]; // to unicode recoding
  69             case 1: eRecodeFrom = RTL_TEXTENCODING_UNICODE; break;
  70             case 2: eRecodeFrom = RTL_TEXTENCODING_SHIFT_JIS; break;
  71             case 3: eRecodeFrom = RTL_TEXTENCODING_GB_2312; break;
  72             case 4: eRecodeFrom = RTL_TEXTENCODING_BIG5; break;
  73             case 5: eRecodeFrom = RTL_TEXTENCODING_MS_949; break;
  74             case 6: eRecodeFrom = RTL_TEXTENCODING_MS_1361; break;
  75         }
  76         rtl_UnicodeToTextConverter aRecodeConverter = rtl_createUnicodeToTextConverter( eRecodeFrom );
  77         maConverterCache[ nSelect ] = aRecodeConverter;
  78
  79         aContext = rtl_createUnicodeToTextContext( aRecodeConverter );
  80         maContexts[ nSelect ] = aContext;
  81     }
  82
  83     rtl_resetUnicodeToTextContext( maConverterCache[ nSelect ], aContext );
  84 }
  85
  86 sal_uInt16 ConverterCache::convertOne( int nSelect, sal_Unicode aChar )
  87 {
  88     ensureConverter( nSelect );
  89
  90     sal_Unicode aUCS2Char = aChar;
  91     sal_Char aTempArray[8];
  92     sal_Size nTempSize;
  93     sal_uInt32 nCvtInfo;
  94
  95     // TODO: use direct unicode->mbcs converter should there ever be one
  96     int nCodeLen = rtl_convertUnicodeToText(
  97             maConverterCache[ nSelect ], maContexts[ nSelect ],
  98             &aUCS2Char, 1, aTempArray, sizeof(aTempArray),
  99             RTL_UNICODETOTEXT_FLAGS_UNDEFINED_0
 100             | RTL_UNICODETOTEXT_FLAGS_INVALID_0,
 101             &nCvtInfo, &nTempSize );
 102
 103     sal_uInt16 aCode = aTempArray[0];
 104     for( int i = 1; i < nCodeLen; ++i )
 105         aCode = (aCode << 8) + (aTempArray[i] & 0xFF);
 106     return aCode;
 107 }
 108
 109 } // anonymous namespace
 110
 111 namespace vcl
 112 {
 113
 114 static ConverterCache aCC;
 115
 116 sal_uInt16 TranslateChar12(sal_uInt16 src)
 117 {
 118     return aCC.convertOne( 2, src);
 119 }
 120
 121 sal_uInt16 TranslateChar13(sal_uInt16 src)
 122 {
 123     return aCC.convertOne( 3, src);
 124 }
 125
 126 sal_uInt16 TranslateChar14(sal_uInt16 src)
 127 {
 128     return aCC.convertOne( 4, src);
 129 }
 130
 131 sal_uInt16 TranslateChar15(sal_uInt16 src)
 132 {
 133     return aCC.convertOne( 5, src);
 134 }
 135
 136 sal_uInt16 TranslateChar16(sal_uInt16 src)
 137 {
 138     return aCC.convertOne( 6, src);
 139 }
 140
 141
 142 } // namespace vcl
 143
 144 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */