base/applications/notepad/text.c

   1 /*
   2  *  Notepad (text.c)
   3  *
   4  *  Copyright 1998,99 Marcel Baur <mbaur@g26.ethz.ch>
   5  *  Copyright 2002 Sylvain Petreolle <spetreolle@yahoo.fr>
   6  *  Copyright 2002 Andriy Palamarchuk
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with this library; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <notepad.h>
  24
  25 static BOOL Append(LPWSTR *ppszText, DWORD *pdwTextLen, LPCWSTR pszAppendText, DWORD dwAppendLen)
  26 {
  27         LPWSTR pszNewText;
  28
  29         if (dwAppendLen > 0)
  30         {
  31                 if (*ppszText)
  32                 {
  33                         pszNewText = (LPWSTR) HeapReAlloc(GetProcessHeap(), 0, *ppszText, (*pdwTextLen + dwAppendLen) * sizeof(WCHAR));
  34                 }
  35                 else
  36                 {
  37                         pszNewText = (LPWSTR) HeapAlloc(GetProcessHeap(), 0, dwAppendLen * sizeof(WCHAR));
  38                 }
  39
  40                 if (!pszNewText)
  41                         return FALSE;
  42
  43                 memcpy(pszNewText + *pdwTextLen, pszAppendText, dwAppendLen * sizeof(WCHAR));
  44                 *ppszText = pszNewText;
  45                 *pdwTextLen += dwAppendLen;
  46         }
  47         return TRUE;
  48 }
  49
  50 BOOL ReadText(HANDLE hFile, LPWSTR *ppszText, DWORD *pdwTextLen, int *piEncoding, int *piEoln)
  51 {
  52         DWORD dwSize;
  53         LPBYTE pBytes = NULL;
  54         LPCWSTR pszText;
  55         LPWSTR pszAllocText = NULL;
  56         DWORD dwPos, i;
  57         DWORD dwCharCount;
  58         BOOL bSuccess = FALSE;
  59         BYTE b = 0;
  60         int iEncoding = ENCODING_ANSI;
  61         int iCodePage;
  62         WCHAR szCrlf[2] = { '\r', '\n' };
  63         DWORD adwEolnCount[3] = { 0, 0, 0 };
  64
  65         *ppszText = NULL;
  66         *pdwTextLen = 0;
  67
  68         dwSize = GetFileSize(hFile, NULL);
  69         if (dwSize == INVALID_FILE_SIZE)
  70                 goto done;
  71
  72         pBytes = HeapAlloc(GetProcessHeap(), 0, dwSize + 2);
  73         if (!pBytes)
  74                 goto done;
  75
  76         if (!ReadFile(hFile, pBytes, dwSize, &dwSize, NULL))
  77                 goto done;
  78         dwPos = 0;
  79
  80         /* Make sure that there is a NUL character at the end, in any encoding */
  81         pBytes[dwSize + 0] = '\0';
  82         pBytes[dwSize + 1] = '\0';
  83
  84         /* Look for Byte Order Marks */
  85         if ((dwSize >= 2) && (pBytes[0] == 0xFF) && (pBytes[1] == 0xFE))
  86         {
  87                 iEncoding = ENCODING_UNICODE;
  88                 dwPos += 2;
  89         }
  90         else if ((dwSize >= 2) && (pBytes[0] == 0xFE) && (pBytes[1] == 0xFF))
  91         {
  92                 iEncoding = ENCODING_UNICODE_BE;
  93                 dwPos += 2;
  94         }
  95         else if ((dwSize >= 3) && (pBytes[0] == 0xEF) && (pBytes[1] == 0xBB) && (pBytes[2] == 0xBF))
  96         {
  97                 iEncoding = ENCODING_UTF8;
  98                 dwPos += 3;
  99         }
 100
 101         switch(iEncoding)
 102         {
 103         case ENCODING_UNICODE_BE:
 104                 for (i = dwPos; i < dwSize-1; i += 2)
 105                 {
 106                         b = pBytes[i+0];
 107                         pBytes[i+0] = pBytes[i+1];
 108                         pBytes[i+1] = b;
 109                 }
 110                 /* fall through */
 111
 112         case ENCODING_UNICODE:
 113                 pszText = (LPCWSTR) &pBytes[dwPos];
 114                 dwCharCount = (dwSize - dwPos) / sizeof(WCHAR);
 115                 break;
 116
 117         case ENCODING_ANSI:
 118         case ENCODING_UTF8:
 119                 if (iEncoding == ENCODING_ANSI)
 120                         iCodePage = CP_ACP;
 121                 else if (iEncoding == ENCODING_UTF8)
 122                         iCodePage = CP_UTF8;
 123                 else
 124                         goto done;
 125
 126                 if ((dwSize - dwPos) > 0)
 127                 {
 128                         dwCharCount = MultiByteToWideChar(iCodePage, 0, (LPCSTR)&pBytes[dwPos], dwSize - dwPos, NULL, 0);
 129                         if (dwCharCount == 0)
 130                                 goto done;
 131                 }
 132                 else
 133                 {
 134                         /* special case for files with no characters (other than BOMs) */
 135                         dwCharCount = 0;
 136                 }
 137
 138                 pszAllocText = (LPWSTR) HeapAlloc(GetProcessHeap(), 0, (dwCharCount + 1) * sizeof(WCHAR));
 139                 if (!pszAllocText)
 140                         goto done;
 141
 142                 if ((dwSize - dwPos) > 0)
 143                 {
 144                         if (!MultiByteToWideChar(iCodePage, 0, (LPCSTR)&pBytes[dwPos], dwSize - dwPos, pszAllocText, dwCharCount))
 145                                 goto done;
 146                 }
 147
 148                 pszAllocText[dwCharCount] = '\0';
 149                 pszText = pszAllocText;
 150                 break;
 151         }
 152
 153         dwPos = 0;
 154         for (i = 0; i < dwCharCount; i++)
 155         {
 156                 switch(pszText[i])
 157                 {
 158                 case '\r':
 159                         if ((i < dwCharCount-1) && (pszText[i+1] == '\n'))
 160                         {
 161                                 i++;
 162                                 adwEolnCount[EOLN_CRLF]++;
 163                                 break;
 164                         }
 165                         /* fall through */
 166
 167                 case '\n':
 168                         if (!Append(ppszText, pdwTextLen, &pszText[dwPos], i - dwPos))
 169                                 return FALSE;
 170                         if (!Append(ppszText, pdwTextLen, szCrlf, sizeof(szCrlf) / sizeof(szCrlf[0])))
 171                                 return FALSE;
 172                         dwPos = i + 1;
 173
 174                         if (pszText[i] == '\r')
 175                                 adwEolnCount[EOLN_CR]++;
 176                         else
 177                                 adwEolnCount[EOLN_LF]++;
 178                         break;
 179                 }
 180         }
 181
 182         if (!*ppszText && (pszText == pszAllocText))
 183         {
 184                 /* special case; don't need to reallocate */
 185                 *ppszText = pszAllocText;
 186                 *pdwTextLen = dwCharCount;
 187                 pszAllocText = NULL;
 188         }
 189         else
 190         {
 191                 /* append last remaining text */
 192                 if (!Append(ppszText, pdwTextLen, &pszText[dwPos], i - dwPos + 1))
 193                         return FALSE;
 194         }
 195
 196         /* chose which eoln to use */
 197         *piEoln = EOLN_CRLF;
 198         if (adwEolnCount[EOLN_LF] > adwEolnCount[*piEoln])
 199                 *piEoln = EOLN_LF;
 200         if (adwEolnCount[EOLN_CR] > adwEolnCount[*piEoln])
 201                 *piEoln = EOLN_CR;
 202         *piEncoding = iEncoding;
 203
 204         bSuccess = TRUE;
 205
 206 done:
 207         if (pBytes)
 208                 HeapFree(GetProcessHeap(), 0, pBytes);
 209         if (pszAllocText)
 210                 HeapFree(GetProcessHeap(), 0, pszAllocText);
 211
 212         if (!bSuccess && *ppszText)
 213         {
 214                 HeapFree(GetProcessHeap(), 0, *ppszText);
 215                 *ppszText = NULL;
 216                 *pdwTextLen = 0;
 217         }
 218         return bSuccess;
 219 }
 220
 221 static BOOL WriteEncodedText(HANDLE hFile, LPCWSTR pszText, DWORD dwTextLen, int iEncoding)
 222 {
 223         LPBYTE pBytes = NULL;
 224         LPBYTE pAllocBuffer = NULL;
 225         DWORD dwPos = 0;
 226         DWORD dwByteCount;
 227         BYTE buffer[1024];
 228         UINT iCodePage;
 229         DWORD dwDummy, i;
 230         BOOL bSuccess = FALSE;
 231         int iBufferSize, iRequiredBytes;
 232         BYTE b;
 233
 234         while(dwPos < dwTextLen)
 235         {
 236                 switch(iEncoding)
 237                 {
 238                         case ENCODING_UNICODE:
 239                                 pBytes = (LPBYTE) &pszText[dwPos];
 240                                 dwByteCount = (dwTextLen - dwPos) * sizeof(WCHAR);
 241                                 dwPos = dwTextLen;
 242                                 break;
 243
 244                         case ENCODING_UNICODE_BE:
 245                                 dwByteCount = (dwTextLen - dwPos) * sizeof(WCHAR);
 246                                 if (dwByteCount > sizeof(buffer))
 247                                         dwByteCount = sizeof(buffer);
 248
 249                                 memcpy(buffer, &pszText[dwPos], dwByteCount);
 250                                 for (i = 0; i < dwByteCount; i += 2)
 251                                 {
 252                                         b = buffer[i+0];
 253                                         buffer[i+0] = buffer[i+1];
 254                                         buffer[i+1] = b;
 255                                 }
 256                                 pBytes = (LPBYTE) &buffer[dwPos];
 257                                 dwPos += dwByteCount / sizeof(WCHAR);
 258                                 break;
 259
 260                         case ENCODING_ANSI:
 261                         case ENCODING_UTF8:
 262                                 if (iEncoding == ENCODING_ANSI)
 263                                         iCodePage = CP_ACP;
 264                                 else if (iEncoding == ENCODING_UTF8)
 265                                         iCodePage = CP_UTF8;
 266                                 else
 267                                         goto done;
 268
 269                                 iRequiredBytes = WideCharToMultiByte(iCodePage, 0, &pszText[dwPos], dwTextLen - dwPos, NULL, 0, NULL, NULL);
 270                                 if (iRequiredBytes <= 0)
 271                                 {
 272                                         goto done;
 273                                 }
 274                                 else if (iRequiredBytes < sizeof(buffer))
 275                                 {
 276                                         pBytes = buffer;
 277                                         iBufferSize = sizeof(buffer);
 278                                 }
 279                                 else
 280                                 {
 281                                         pAllocBuffer = (LPBYTE) HeapAlloc(GetProcessHeap(), 0, iRequiredBytes);
 282                                         if (!pAllocBuffer)
 283                                                 return FALSE;
 284                                         pBytes = pAllocBuffer;
 285                                         iBufferSize = iRequiredBytes;
 286                                 }
 287
 288                                 dwByteCount = WideCharToMultiByte(iCodePage, 0, &pszText[dwPos], dwTextLen - dwPos, (LPSTR) pBytes, iBufferSize, NULL, NULL);
 289                                 if (!dwByteCount)
 290                                         goto done;
 291
 292                                 dwPos = dwTextLen;
 293                                 break;
 294
 295                         default:
 296                                 goto done;
 297                 }
 298
 299                 if (!WriteFile(hFile, pBytes, dwByteCount, &dwDummy, NULL))
 300                         goto done;
 301
 302                 /* free the buffer, if we have allocated one */
 303                 if (pAllocBuffer)
 304                 {
 305                         HeapFree(GetProcessHeap(), 0, pAllocBuffer);
 306                         pAllocBuffer = NULL;
 307                 }
 308         }
 309         bSuccess = TRUE;
 310
 311 done:
 312         if (pAllocBuffer)
 313                 HeapFree(GetProcessHeap(), 0, pAllocBuffer);
 314         return bSuccess;
 315 }
 316
 317 BOOL WriteText(HANDLE hFile, LPCWSTR pszText, DWORD dwTextLen, int iEncoding, int iEoln)
 318 {
 319         WCHAR wcBom;
 320         WCHAR wcEoln;
 321         BYTE bEoln;
 322         LPBYTE pbEoln = NULL;
 323         DWORD dwDummy, dwPos, dwNext, dwEolnSize = 0;
 324
 325         /* Write the proper byte order marks if not ANSI */
 326         if (iEncoding != ENCODING_ANSI)
 327         {
 328                 wcBom = 0xFEFF;
 329                 if (!WriteEncodedText(hFile, &wcBom, 1, iEncoding))
 330                         return FALSE;
 331         }
 332
 333         /* Identify the proper eoln to use */
 334         switch(iEoln)
 335         {
 336         case EOLN_LF:
 337                 bEoln = '\n';
 338                 pbEoln = &bEoln;
 339                 dwEolnSize = sizeof(bEoln);
 340                 break;
 341         case EOLN_CR:
 342                 bEoln = '\r';
 343                 pbEoln = &bEoln;
 344                 dwEolnSize = sizeof(bEoln);
 345                 break;
 346         }
 347
 348         /* If we have an eoln, make sure it is of the proper encoding */
 349         if (pbEoln && ((iEncoding == ENCODING_UNICODE) || (iEncoding == ENCODING_UNICODE_BE)))
 350         {
 351                 wcEoln = bEoln;
 352                 pbEoln = (LPBYTE) &wcEoln;
 353                 dwEolnSize = sizeof(wcEoln);
 354         }
 355
 356         dwPos = 0;
 357
 358         while(dwPos < dwTextLen)
 359         {
 360                 if (pbEoln)
 361                 {
 362                         /* Find the next eoln */
 363                         dwNext = dwPos;
 364                         while(dwNext < dwTextLen-1)
 365                         {
 366                                 if ((pszText[dwNext] == '\r') && (pszText[dwNext+1] == '\n'))
 367                                         break;
 368                                 dwNext++;
 369                         }
 370                 }
 371                 else
 372                 {
 373                         /* No eoln conversion is necessary */
 374                         dwNext = dwTextLen;
 375                 }
 376
 377                 if (!WriteEncodedText(hFile, &pszText[dwPos], dwNext - dwPos, iEncoding))
 378                         return FALSE;
 379                 dwPos = dwNext;
 380
 381                 /* are we at an eoln? */
 382                 while ((dwPos < dwTextLen-1) &&
 383                         ((pszText[dwPos] == '\r') && (pszText[dwPos+1] == '\n')))
 384                 {
 385                         if (!WriteFile(hFile, pbEoln, dwEolnSize, &dwDummy, NULL))
 386                                 return FALSE;
 387                         dwPos += 2;
 388                 }
 389         }
 390         while(dwPos < dwTextLen);
 391
 392         return TRUE;
 393 }
 394