src/TortoiseMerge/libsvn_diff/win32_xlate.c

   1 /*
   2  * win32_xlate.c : Windows xlate stuff.
   3  *
   4  * ====================================================================
   5  *    Licensed to the Apache Software Foundation (ASF) under one
   6  *    or more contributor license agreements.  See the NOTICE file
   7  *    distributed with this work for additional information
   8  *    regarding copyright ownership.  The ASF licenses this file
   9  *    to you under the Apache License, Version 2.0 (the
  10  *    "License"); you may not use this file except in compliance
  11  *    with the License.  You may obtain a copy of the License at
  12  *
  13  *      http://www.apache.org/licenses/LICENSE-2.0
  14  *
  15  *    Unless required by applicable law or agreed to in writing,
  16  *    software distributed under the License is distributed on an
  17  *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  18  *    KIND, either express or implied.  See the License for the
  19  *    specific language governing permissions and limitations
  20  *    under the License.
  21  * ====================================================================
  22  */
  23
  24 /* prevent "empty compilation unit" warning on e.g. UNIX */
  25 typedef int win32_xlate__dummy;
  26
  27 #ifdef WIN32
  28
  29 /* Define _WIN32_DCOM for CoInitializeEx(). */
  30 #define _WIN32_DCOM
  31
  32 /* We must include windows.h ourselves or apr.h includes it for us with
  33    many ignore options set. Including Winsock is required to resolve IPv6
  34    compilation errors. APR_HAVE_IPV6 is only defined after including
  35    apr.h, so we can't detect this case here. */
  36
  37 /* winsock2.h includes windows.h */
  38 #include <winsock2.h>
  39 #include <Ws2tcpip.h>
  40 #include <mlang.h>
  41
  42 #include <apr.h>
  43 #include <apr_errno.h>
  44 #include <apr_portable.h>
  45
  46 #include "svn_pools.h"
  47 #include "svn_string.h"
  48 #include "svn_utf.h"
  49 #include "private/svn_atomic.h"
  50
  51 #include "win32_xlate.h"
  52
  53 static svn_atomic_t com_initialized = 0;
  54
  55 /* Initializes COM and keeps COM available until process exit.
  56    Implements svn_atomic__init_once init_func */
  57 static svn_error_t *
  58 initialize_com(void *baton, apr_pool_t* pool)
  59 {
  60   /* Try to initialize for apartment-threaded object concurrency. */
  61   HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
  62
  63   if (hr == RPC_E_CHANGED_MODE)
  64     {
  65       /* COM already initalized for multi-threaded object concurrency. We are
  66          neutral to object concurrency so try to initalize it in the same way
  67          for us, to keep an handle open. */
  68       hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
  69     }
  70
  71   if (FAILED(hr))
  72     return svn_error_create(APR_EGENERAL, NULL, NULL);
  73
  74   return SVN_NO_ERROR;
  75 }
  76
  77 typedef struct win32_xlate_t
  78 {
  79   UINT from_page_id;
  80   UINT to_page_id;
  81 } win32_xlate_t;
  82
  83 static apr_status_t
  84 get_page_id_from_name(UINT *page_id_p, const char *page_name, apr_pool_t *pool)
  85 {
  86   IMultiLanguage * mlang = NULL;
  87   HRESULT hr;
  88   MIMECSETINFO page_info;
  89   WCHAR ucs2_page_name[128];
  90   svn_error_t *err;
  91
  92   if (page_name == SVN_APR_DEFAULT_CHARSET)
  93     {
  94         *page_id_p = CP_ACP;
  95         return APR_SUCCESS;
  96     }
  97   else if (page_name == SVN_APR_LOCALE_CHARSET)
  98     {
  99       *page_id_p = CP_THREAD_ACP; /* Valid on Windows 2000+ */
 100       return APR_SUCCESS;
 101     }
 102   else if (!strcmp(page_name, "UTF-8"))
 103     {
 104       *page_id_p = CP_UTF8;
 105       return APR_SUCCESS;
 106     }
 107
 108   /* Use codepage identifier nnn if the codepage name is in the form
 109      of "CPnnn".
 110      We need this code since apr_os_locale_encoding() and svn_cmdline_init()
 111      generates such codepage names even if they are not valid IANA charset
 112      name. */
 113   if ((page_name[0] == 'c' || page_name[0] == 'C')
 114       && (page_name[1] == 'p' || page_name[1] == 'P'))
 115     {
 116       *page_id_p = atoi(page_name + 2);
 117       return APR_SUCCESS;
 118     }
 119
 120   err = svn_atomic__init_once(&com_initialized, initialize_com, NULL, pool);
 121
 122   if (err)
 123     {
 124       svn_error_clear(err);
 125       return APR_EGENERAL;
 126     }
 127
 128   hr = CoCreateInstance(&CLSID_CMultiLanguage, NULL, CLSCTX_INPROC_SERVER,
 129                         &IID_IMultiLanguage, (void **) &mlang);
 130
 131   if (FAILED(hr))
 132     return APR_EGENERAL;
 133
 134   /* Convert page name to wide string. */
 135   MultiByteToWideChar(CP_UTF8, 0, page_name, -1, ucs2_page_name,
 136                       sizeof(ucs2_page_name) / sizeof(ucs2_page_name[0]));
 137   memset(&page_info, 0, sizeof(page_info));
 138   hr = mlang->lpVtbl->GetCharsetInfo(mlang, ucs2_page_name, &page_info);
 139   if (FAILED(hr))
 140     {
 141       mlang->lpVtbl->Release(mlang);
 142       return APR_EINVAL;
 143     }
 144
 145   if (page_info.uiInternetEncoding)
 146     *page_id_p = page_info.uiInternetEncoding;
 147   else
 148     *page_id_p = page_info.uiCodePage;
 149
 150   mlang->lpVtbl->Release(mlang);
 151
 152   return APR_SUCCESS;
 153 }
 154
 155 apr_status_t
 156 svn_subr__win32_xlate_open(win32_xlate_t **xlate_p, const char *topage,
 157                            const char *frompage, apr_pool_t *pool)
 158 {
 159   UINT from_page_id, to_page_id;
 160   apr_status_t apr_err = APR_SUCCESS;
 161   win32_xlate_t *xlate;
 162
 163   apr_err = get_page_id_from_name(&to_page_id, topage, pool);
 164   if (apr_err == APR_SUCCESS)
 165     apr_err = get_page_id_from_name(&from_page_id, frompage, pool);
 166
 167   if (apr_err == APR_SUCCESS)
 168     {
 169       xlate = apr_palloc(pool, sizeof(*xlate));
 170       xlate->from_page_id = from_page_id;
 171       xlate->to_page_id = to_page_id;
 172
 173       *xlate_p = xlate;
 174     }
 175
 176   return apr_err;
 177 }
 178
 179 apr_status_t
 180 svn_subr__win32_xlate_to_stringbuf(win32_xlate_t *handle,
 181                                    const char *src_data,
 182                                    apr_size_t src_length,
 183                                    svn_stringbuf_t **dest,
 184                                    apr_pool_t *pool)
 185 {
 186   WCHAR * wide_str;
 187   int retval, wide_size;
 188
 189   if (src_length == 0)
 190   {
 191     *dest = svn_stringbuf_create_empty(pool);
 192     return APR_SUCCESS;
 193   }
 194
 195   retval = MultiByteToWideChar(handle->from_page_id, 0, src_data, src_length,
 196                                NULL, 0);
 197   if (retval == 0)
 198     return apr_get_os_error();
 199
 200   wide_size = retval;
 201
 202   /* Allocate temporary buffer for small strings on stack instead of heap. */
 203   if (wide_size <= MAX_PATH)
 204     {
 205       wide_str = _alloca(wide_size * sizeof(WCHAR));
 206     }
 207   else
 208     {
 209       wide_str = apr_palloc(pool, wide_size * sizeof(WCHAR));
 210     }
 211
 212   retval = MultiByteToWideChar(handle->from_page_id, 0, src_data, src_length,
 213                                wide_str, wide_size);
 214
 215   if (retval == 0)
 216     return apr_get_os_error();
 217
 218   retval = WideCharToMultiByte(handle->to_page_id, 0, wide_str, wide_size,
 219                                NULL, 0, NULL, NULL);
 220
 221   if (retval == 0)
 222     return apr_get_os_error();
 223
 224   /* Ensure that buffer is enough to hold result string and termination
 225      character. */
 226   *dest = svn_stringbuf_create_ensure(retval + 1, pool);
 227   (*dest)->len = retval;
 228
 229   retval = WideCharToMultiByte(handle->to_page_id, 0, wide_str, wide_size,
 230                                (*dest)->data, (*dest)->len, NULL, NULL);
 231   if (retval == 0)
 232     return apr_get_os_error();
 233
 234   (*dest)->len = retval;
 235   return APR_SUCCESS;
 236 }
 237
 238 #endif /* WIN32 */