reactos/base/applications/notepad/text.c
2018-06-29 18:49:44 +02:00

388 lines
11 KiB
C

/*
* Notepad (text.c)
*
* Copyright 1998,99 Marcel Baur <mbaur@g26.ethz.ch>
* Copyright 2002 Sylvain Petreolle <spetreolle@yahoo.fr>
* Copyright 2002 Andriy Palamarchuk
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "notepad.h"
static BOOL Append(LPWSTR *ppszText, DWORD *pdwTextLen, LPCWSTR pszAppendText, DWORD dwAppendLen)
{
LPWSTR pszNewText;
if (dwAppendLen > 0)
{
if (*ppszText)
{
pszNewText = (LPWSTR) HeapReAlloc(GetProcessHeap(), 0, *ppszText, (*pdwTextLen + dwAppendLen) * sizeof(WCHAR));
}
else
{
pszNewText = (LPWSTR) HeapAlloc(GetProcessHeap(), 0, dwAppendLen * sizeof(WCHAR));
}
if (!pszNewText)
return FALSE;
memcpy(pszNewText + *pdwTextLen, pszAppendText, dwAppendLen * sizeof(WCHAR));
*ppszText = pszNewText;
*pdwTextLen += dwAppendLen;
}
return TRUE;
}
BOOL
ReadText(HANDLE hFile, LPWSTR *ppszText, DWORD *pdwTextLen, ENCODING *pencFile, int *piEoln)
{
DWORD dwSize;
LPBYTE pBytes = NULL;
LPWSTR pszText;
LPWSTR pszAllocText = NULL;
DWORD dwPos, i;
DWORD dwCharCount;
BOOL bSuccess = FALSE;
BYTE b = 0;
ENCODING encFile = ENCODING_ANSI;
int iCodePage = 0;
WCHAR szCrlf[2] = {'\r', '\n'};
DWORD adwEolnCount[3] = {0, 0, 0};
*ppszText = NULL;
*pdwTextLen = 0;
dwSize = GetFileSize(hFile, NULL);
if (dwSize == INVALID_FILE_SIZE)
goto done;
pBytes = HeapAlloc(GetProcessHeap(), 0, dwSize + 2);
if (!pBytes)
goto done;
if (!ReadFile(hFile, pBytes, dwSize, &dwSize, NULL))
goto done;
dwPos = 0;
/* Make sure that there is a NUL character at the end, in any encoding */
pBytes[dwSize + 0] = '\0';
pBytes[dwSize + 1] = '\0';
/* Look for Byte Order Marks */
if ((dwSize >= 2) && (pBytes[0] == 0xFF) && (pBytes[1] == 0xFE))
{
encFile = ENCODING_UNICODE;
dwPos += 2;
}
else if ((dwSize >= 2) && (pBytes[0] == 0xFE) && (pBytes[1] == 0xFF))
{
encFile = ENCODING_UNICODE_BE;
dwPos += 2;
}
else if ((dwSize >= 3) && (pBytes[0] == 0xEF) && (pBytes[1] == 0xBB) && (pBytes[2] == 0xBF))
{
encFile = ENCODING_UTF8;
dwPos += 3;
}
switch(encFile)
{
case ENCODING_UNICODE_BE:
for (i = dwPos; i < dwSize-1; i += 2)
{
b = pBytes[i+0];
pBytes[i+0] = pBytes[i+1];
pBytes[i+1] = b;
}
/* fall through */
case ENCODING_UNICODE:
pszText = (LPWSTR) &pBytes[dwPos];
dwCharCount = (dwSize - dwPos) / sizeof(WCHAR);
break;
case ENCODING_ANSI:
case ENCODING_UTF8:
if (encFile == ENCODING_ANSI)
iCodePage = CP_ACP;
else if (encFile == ENCODING_UTF8)
iCodePage = CP_UTF8;
if ((dwSize - dwPos) > 0)
{
dwCharCount = MultiByteToWideChar(iCodePage, 0, (LPCSTR)&pBytes[dwPos], dwSize - dwPos, NULL, 0);
if (dwCharCount == 0)
goto done;
}
else
{
/* special case for files with no characters (other than BOMs) */
dwCharCount = 0;
}
pszAllocText = (LPWSTR) HeapAlloc(GetProcessHeap(), 0, (dwCharCount + 1) * sizeof(WCHAR));
if (!pszAllocText)
goto done;
if ((dwSize - dwPos) > 0)
{
if (!MultiByteToWideChar(iCodePage, 0, (LPCSTR)&pBytes[dwPos], dwSize - dwPos, pszAllocText, dwCharCount))
goto done;
}
pszAllocText[dwCharCount] = '\0';
pszText = pszAllocText;
break;
DEFAULT_UNREACHABLE;
}
dwPos = 0;
for (i = 0; i < dwCharCount; i++)
{
switch(pszText[i])
{
case '\r':
if ((i < dwCharCount-1) && (pszText[i+1] == '\n'))
{
i++;
adwEolnCount[EOLN_CRLF]++;
break;
}
/* fall through */
case '\n':
if (!Append(ppszText, pdwTextLen, &pszText[dwPos], i - dwPos))
return FALSE;
if (!Append(ppszText, pdwTextLen, szCrlf, ARRAY_SIZE(szCrlf)))
return FALSE;
dwPos = i + 1;
if (pszText[i] == '\r')
adwEolnCount[EOLN_CR]++;
else
adwEolnCount[EOLN_LF]++;
break;
case '\0':
pszText[i] = ' ';
break;
}
}
if (!*ppszText && (pszText == pszAllocText))
{
/* special case; don't need to reallocate */
*ppszText = pszAllocText;
*pdwTextLen = dwCharCount;
pszAllocText = NULL;
}
else
{
/* append last remaining text */
if (!Append(ppszText, pdwTextLen, &pszText[dwPos], i - dwPos + 1))
return FALSE;
}
/* chose which eoln to use */
*piEoln = EOLN_CRLF;
if (adwEolnCount[EOLN_LF] > adwEolnCount[*piEoln])
*piEoln = EOLN_LF;
if (adwEolnCount[EOLN_CR] > adwEolnCount[*piEoln])
*piEoln = EOLN_CR;
*pencFile = encFile;
bSuccess = TRUE;
done:
if (pBytes)
HeapFree(GetProcessHeap(), 0, pBytes);
if (pszAllocText)
HeapFree(GetProcessHeap(), 0, pszAllocText);
if (!bSuccess && *ppszText)
{
HeapFree(GetProcessHeap(), 0, *ppszText);
*ppszText = NULL;
*pdwTextLen = 0;
}
return bSuccess;
}
static BOOL WriteEncodedText(HANDLE hFile, LPCWSTR pszText, DWORD dwTextLen, ENCODING encFile)
{
LPBYTE pBytes = NULL;
LPBYTE pAllocBuffer = NULL;
DWORD dwPos = 0;
DWORD dwByteCount;
BYTE buffer[1024];
UINT iCodePage = 0;
DWORD dwDummy, i;
BOOL bSuccess = FALSE;
int iBufferSize, iRequiredBytes;
BYTE b;
while(dwPos < dwTextLen)
{
switch(encFile)
{
case ENCODING_UNICODE:
pBytes = (LPBYTE) &pszText[dwPos];
dwByteCount = (dwTextLen - dwPos) * sizeof(WCHAR);
dwPos = dwTextLen;
break;
case ENCODING_UNICODE_BE:
dwByteCount = (dwTextLen - dwPos) * sizeof(WCHAR);
if (dwByteCount > sizeof(buffer))
dwByteCount = sizeof(buffer);
memcpy(buffer, &pszText[dwPos], dwByteCount);
for (i = 0; i < dwByteCount; i += 2)
{
b = buffer[i+0];
buffer[i+0] = buffer[i+1];
buffer[i+1] = b;
}
pBytes = (LPBYTE) &buffer[dwPos];
dwPos += dwByteCount / sizeof(WCHAR);
break;
case ENCODING_ANSI:
case ENCODING_UTF8:
if (encFile == ENCODING_ANSI)
iCodePage = CP_ACP;
else if (encFile == ENCODING_UTF8)
iCodePage = CP_UTF8;
iRequiredBytes = WideCharToMultiByte(iCodePage, 0, &pszText[dwPos], dwTextLen - dwPos, NULL, 0, NULL, NULL);
if (iRequiredBytes <= 0)
{
goto done;
}
else if (iRequiredBytes < sizeof(buffer))
{
pBytes = buffer;
iBufferSize = sizeof(buffer);
}
else
{
pAllocBuffer = (LPBYTE) HeapAlloc(GetProcessHeap(), 0, iRequiredBytes);
if (!pAllocBuffer)
return FALSE;
pBytes = pAllocBuffer;
iBufferSize = iRequiredBytes;
}
dwByteCount = WideCharToMultiByte(iCodePage, 0, &pszText[dwPos], dwTextLen - dwPos, (LPSTR) pBytes, iBufferSize, NULL, NULL);
if (!dwByteCount)
goto done;
dwPos = dwTextLen;
break;
default:
goto done;
}
if (!WriteFile(hFile, pBytes, dwByteCount, &dwDummy, NULL))
goto done;
/* free the buffer, if we have allocated one */
if (pAllocBuffer)
{
HeapFree(GetProcessHeap(), 0, pAllocBuffer);
pAllocBuffer = NULL;
}
}
bSuccess = TRUE;
done:
if (pAllocBuffer)
HeapFree(GetProcessHeap(), 0, pAllocBuffer);
return bSuccess;
}
BOOL WriteText(HANDLE hFile, LPCWSTR pszText, DWORD dwTextLen, ENCODING encFile, int iEoln)
{
WCHAR wcBom;
LPCWSTR pszLF = L"\n";
DWORD dwPos, dwNext;
/* Write the proper byte order marks if not ANSI */
if (encFile != ENCODING_ANSI)
{
wcBom = 0xFEFF;
if (!WriteEncodedText(hFile, &wcBom, 1, encFile))
return FALSE;
}
dwPos = 0;
/* pszText eoln are always \r\n */
do
{
/* Find the next eoln */
dwNext = dwPos;
while(dwNext < dwTextLen)
{
if (pszText[dwNext] == '\r' && pszText[dwNext + 1] == '\n')
break;
dwNext++;
}
if (dwNext != dwTextLen)
{
switch (iEoln)
{
case EOLN_LF:
/* Write text (without eoln) */
if (!WriteEncodedText(hFile, &pszText[dwPos], dwNext - dwPos, encFile))
return FALSE;
/* Write eoln */
if (!WriteEncodedText(hFile, pszLF, 1, encFile))
return FALSE;
break;
case EOLN_CR:
/* Write text (including \r as eoln) */
if (!WriteEncodedText(hFile, &pszText[dwPos], dwNext - dwPos + 1, encFile))
return FALSE;
break;
case EOLN_CRLF:
/* Write text (including \r\n as eoln) */
if (!WriteEncodedText(hFile, &pszText[dwPos], dwNext - dwPos + 2, encFile))
return FALSE;
break;
default:
return FALSE;
}
}
else
{
/* Write text (without eoln, since this is the end of the file) */
if (!WriteEncodedText(hFile, &pszText[dwPos], dwNext - dwPos, encFile))
return FALSE;
}
/* Skip \r\n */
dwPos = dwNext + 2;
}
while (dwPos < dwTextLen);
return TRUE;
}