vcl/win/dtrans/TxtCnvtHlp.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 <osl/diagnose.h>
  21
  22 #include "TxtCnvtHlp.hxx"
  23 #include "DTransHelper.hxx"
  24 #include "ImplHelper.hxx"
  25
  26 using namespace ::com::sun::star::datatransfer;
  27 using namespace ::com::sun::star::uno;
  28
  29 // assuming a '\0' terminated string if no length specified
  30
  31 static int CalcBuffSizeForTextConversion( UINT code_page, LPCSTR lpMultiByteString, int nLen = -1 )
  32 {
  33     return ( MultiByteToWideChar( code_page,
  34                                 0,
  35                                 lpMultiByteString,
  36                                 nLen,
  37                                 nullptr,
  38                                 0 ) * sizeof( sal_Unicode ) );
  39 }
  40
  41 // assuming a '\0' terminated string if no length specified
  42
  43 static int CalcBuffSizeForTextConversion( UINT code_page, LPCWSTR lpWideCharString, int nLen = -1 )
  44 {
  45     return WideCharToMultiByte( code_page,
  46                                 0,
  47                                 lpWideCharString,
  48                                 nLen,
  49                                 nullptr,
  50                                 0,
  51                                 nullptr,
  52                                 nullptr );
  53 }
  54
  55 // converts text in one code page into unicode text
  56 // automatically calculates the necessary buffer size and allocates
  57 // the buffer
  58
  59 int MultiByteToWideCharEx( UINT cp_src,
  60                            LPCSTR lpMultiByteString,
  61                            int lenStr,
  62                            CStgTransferHelper& refDTransHelper,
  63                            BOOL bEnsureTrailingZero )
  64 {
  65     OSL_ASSERT( IsValidCodePage( cp_src ) );
  66     OSL_ASSERT( nullptr != lpMultiByteString );
  67
  68     // calculate the required buff size
  69     int reqSize = CalcBuffSizeForTextConversion( cp_src, lpMultiByteString, lenStr );
  70
  71     if ( bEnsureTrailingZero )
  72         reqSize += sizeof( sal_Unicode );
  73
  74     // initialize the data-transfer helper
  75     refDTransHelper.init( reqSize );
  76
  77     // setup a global memory pointer
  78     CRawHGlobalPtr ptrHGlob( refDTransHelper );
  79
  80     // do the conversion and return
  81     return MultiByteToWideChar( cp_src,
  82                                 0,
  83                                 lpMultiByteString,
  84                                 lenStr,
  85                                 static_cast< LPWSTR >( ptrHGlob.GetMemPtr( ) ),
  86                                 ptrHGlob.MemSize( ) );
  87 }
  88
  89 // converts unicode text into text of the specified code page
  90 // automatically calculates the necessary buffer size and allocates
  91 // the buffer
  92
  93 int WideCharToMultiByteEx( UINT cp_dest,
  94                            LPCWSTR lpWideCharString,
  95                            int lenStr,
  96                            CStgTransferHelper& refDTransHelper,
  97                            BOOL bEnsureTrailingZero )
  98 {
  99     OSL_ASSERT( IsValidCodePage( cp_dest ) );
 100     OSL_ASSERT( nullptr != lpWideCharString );
 101
 102     // calculate the required buff size
 103     int reqSize = CalcBuffSizeForTextConversion( cp_dest, lpWideCharString, lenStr );
 104
 105     if ( bEnsureTrailingZero )
 106         reqSize += sizeof( sal_Int8 );
 107
 108     // initialize the data-transfer helper
 109     refDTransHelper.init( reqSize );
 110
 111     // setup a global memory pointer
 112     CRawHGlobalPtr ptrHGlob( refDTransHelper );
 113
 114     // do the conversion and return
 115     return WideCharToMultiByte( cp_dest,
 116                                 0,
 117                                 lpWideCharString,
 118                                 lenStr,
 119                                 static_cast< LPSTR >( ptrHGlob.GetMemPtr( ) ),
 120                                 ptrHGlob.MemSize( ),
 121                                 nullptr,
 122                                 nullptr );
 123 }
 124
 125 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */