dtrans/source/win32/dtobj/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 #include "TxtCnvtHlp.hxx"
  22 #include "DTransHelper.hxx"
  23 #include "../misc/ImplHelper.hxx"
  24
  25 using namespace ::com::sun::star::datatransfer;
  26 using namespace ::com::sun::star::uno;
  27
  28 // assuming a '\0' terminated string if no length specified
  29
  30 static int CalcBuffSizeForTextConversion( UINT code_page, LPCSTR lpMultiByteString, int nLen = -1 )
  31 {
  32     return ( MultiByteToWideChar( code_page,
  33                                 0,
  34                                 lpMultiByteString,
  35                                 nLen,
  36                                 nullptr,
  37                                 0 ) * sizeof( sal_Unicode ) );
  38 }
  39
  40 // assuming a '\0' terminated string if no length specified
  41
  42 static int CalcBuffSizeForTextConversion( UINT code_page, LPCWSTR lpWideCharString, int nLen = -1 )
  43 {
  44     return WideCharToMultiByte( code_page,
  45                                 0,
  46                                 lpWideCharString,
  47                                 nLen,
  48                                 nullptr,
  49                                 0,
  50                                 nullptr,
  51                                 nullptr );
  52 }
  53
  54 // converts text in one code page into unicode text
  55 // automatically calculates the necessary buffer size and allocates
  56 // the buffer
  57
  58 int MultiByteToWideCharEx( UINT cp_src,
  59                            LPCSTR lpMultiByteString,
  60                            sal_uInt32 lenStr,
  61                            CStgTransferHelper& refDTransHelper,
  62                            BOOL bEnsureTrailingZero )
  63 {
  64     OSL_ASSERT( IsValidCodePage( cp_src ) );
  65     OSL_ASSERT( nullptr != lpMultiByteString );
  66
  67     // calculate the required buff size
  68     int reqSize = CalcBuffSizeForTextConversion( cp_src, lpMultiByteString, lenStr );
  69
  70     if ( bEnsureTrailingZero )
  71         reqSize += sizeof( sal_Unicode );
  72
  73     // initialize the data-transfer helper
  74     refDTransHelper.init( reqSize );
  75
  76     // setup a global memory pointer
  77     CRawHGlobalPtr ptrHGlob( refDTransHelper );
  78
  79     // do the conversion and return
  80     return MultiByteToWideChar( cp_src,
  81                                 0,
  82                                 lpMultiByteString,
  83                                 lenStr,
  84                                 static_cast< LPWSTR >( ptrHGlob.GetMemPtr( ) ),
  85                                 ptrHGlob.MemSize( ) );
  86 }
  87
  88 // converts unicode text into text of the specified code page
  89 // automatically calculates the necessary buffer size and allocates
  90 // the buffer
  91
  92 int WideCharToMultiByteEx( UINT cp_dest,
  93                            LPCWSTR lpWideCharString,
  94                            sal_uInt32 lenStr,
  95                            CStgTransferHelper& refDTransHelper,
  96                            BOOL bEnsureTrailingZero )
  97 {
  98     OSL_ASSERT( IsValidCodePage( cp_dest ) );
  99     OSL_ASSERT( nullptr != lpWideCharString );
 100
 101     // calculate the required buff size
 102     int reqSize = CalcBuffSizeForTextConversion( cp_dest, lpWideCharString, lenStr );
 103
 104     if ( bEnsureTrailingZero )
 105         reqSize += sizeof( sal_Int8 );
 106
 107     // initialize the data-transfer helper
 108     refDTransHelper.init( reqSize );
 109
 110     // setup a global memory pointer
 111     CRawHGlobalPtr ptrHGlob( refDTransHelper );
 112
 113     // do the conversion and return
 114     return WideCharToMultiByte( cp_dest,
 115                                 0,
 116                                 lpWideCharString,
 117                                 lenStr,
 118                                 static_cast< LPSTR >( ptrHGlob.GetMemPtr( ) ),
 119                                 ptrHGlob.MemSize( ),
 120                                 nullptr,
 121                                 nullptr );
 122 }
 123
 124 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */