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https://github.com/reactos/reactos.git
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437 lines
12 KiB
C
437 lines
12 KiB
C
/*
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* Notepad (text.c)
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*
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* Copyright 1998,99 Marcel Baur <mbaur@g26.ethz.ch>
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* Copyright 2002 Sylvain Petreolle <spetreolle@yahoo.fr>
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* Copyright 2002 Andriy Palamarchuk
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* Copyright 2019 Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "notepad.h"
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static BOOL Append(LPWSTR *ppszText, DWORD *pdwTextLen, LPCWSTR pszAppendText, DWORD dwAppendLen)
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{
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LPWSTR pszNewText;
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if (dwAppendLen > 0)
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{
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if (*ppszText)
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{
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pszNewText = (LPWSTR) HeapReAlloc(GetProcessHeap(), 0, *ppszText, (*pdwTextLen + dwAppendLen) * sizeof(WCHAR));
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}
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else
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{
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pszNewText = (LPWSTR) HeapAlloc(GetProcessHeap(), 0, dwAppendLen * sizeof(WCHAR));
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}
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if (!pszNewText)
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return FALSE;
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memcpy(pszNewText + *pdwTextLen, pszAppendText, dwAppendLen * sizeof(WCHAR));
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*ppszText = pszNewText;
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*pdwTextLen += dwAppendLen;
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}
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return TRUE;
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}
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BOOL IsTextNonZeroASCII(const void *pText, DWORD dwSize)
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{
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const signed char *pBytes = pText;
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while (dwSize-- > 0)
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{
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if (*pBytes <= 0)
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return FALSE;
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++pBytes;
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}
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return TRUE;
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}
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ENCODING AnalyzeEncoding(const char *pBytes, DWORD dwSize)
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{
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INT flags = IS_TEXT_UNICODE_STATISTICS;
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if (dwSize <= 1)
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return ENCODING_ANSI;
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if (IsTextNonZeroASCII(pBytes, dwSize))
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{
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return ENCODING_ANSI;
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}
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if (IsTextUnicode(pBytes, dwSize, &flags))
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{
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return ENCODING_UTF16LE;
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}
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if ((flags & IS_TEXT_UNICODE_REVERSE_MASK) && !(flags & IS_TEXT_UNICODE_ILLEGAL_CHARS))
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{
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return ENCODING_UTF16BE;
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}
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/* is it UTF-8? */
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if (MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, pBytes, dwSize, NULL, 0))
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{
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return ENCODING_UTF8;
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}
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return ENCODING_ANSI;
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}
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BOOL
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ReadText(HANDLE hFile, LPWSTR *ppszText, DWORD *pdwTextLen, ENCODING *pencFile, int *piEoln)
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{
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DWORD dwSize;
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LPBYTE pBytes = NULL;
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LPWSTR pszText;
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LPWSTR pszAllocText = NULL;
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DWORD dwPos, i;
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DWORD dwCharCount;
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BOOL bSuccess = FALSE;
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BYTE b = 0;
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ENCODING encFile = ENCODING_ANSI;
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int iCodePage = 0;
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WCHAR szCrlf[2] = {'\r', '\n'};
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DWORD adwEolnCount[3] = {0, 0, 0};
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*ppszText = NULL;
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*pdwTextLen = 0;
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dwSize = GetFileSize(hFile, NULL);
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if (dwSize == INVALID_FILE_SIZE)
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goto done;
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pBytes = HeapAlloc(GetProcessHeap(), 0, dwSize + 2);
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if (!pBytes)
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goto done;
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if (!ReadFile(hFile, pBytes, dwSize, &dwSize, NULL))
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goto done;
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dwPos = 0;
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/* Make sure that there is a NUL character at the end, in any encoding */
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pBytes[dwSize + 0] = '\0';
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pBytes[dwSize + 1] = '\0';
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/* Look for Byte Order Marks */
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if ((dwSize >= 2) && (pBytes[0] == 0xFF) && (pBytes[1] == 0xFE))
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{
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encFile = ENCODING_UTF16LE;
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dwPos += 2;
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}
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else if ((dwSize >= 2) && (pBytes[0] == 0xFE) && (pBytes[1] == 0xFF))
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{
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encFile = ENCODING_UTF16BE;
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dwPos += 2;
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}
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else if ((dwSize >= 3) && (pBytes[0] == 0xEF) && (pBytes[1] == 0xBB) && (pBytes[2] == 0xBF))
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{
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encFile = ENCODING_UTF8;
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dwPos += 3;
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}
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else
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{
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encFile = AnalyzeEncoding((const char *)pBytes, dwSize);
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}
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switch(encFile)
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{
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case ENCODING_UTF16BE:
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for (i = dwPos; i < dwSize-1; i += 2)
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{
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b = pBytes[i+0];
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pBytes[i+0] = pBytes[i+1];
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pBytes[i+1] = b;
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}
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/* fall through */
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case ENCODING_UTF16LE:
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pszText = (LPWSTR) &pBytes[dwPos];
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dwCharCount = (dwSize - dwPos) / sizeof(WCHAR);
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break;
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case ENCODING_ANSI:
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case ENCODING_UTF8:
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if (encFile == ENCODING_ANSI)
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iCodePage = CP_ACP;
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else if (encFile == ENCODING_UTF8)
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iCodePage = CP_UTF8;
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if ((dwSize - dwPos) > 0)
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{
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dwCharCount = MultiByteToWideChar(iCodePage, 0, (LPCSTR)&pBytes[dwPos], dwSize - dwPos, NULL, 0);
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if (dwCharCount == 0)
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goto done;
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}
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else
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{
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/* special case for files with no characters (other than BOMs) */
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dwCharCount = 0;
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}
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pszAllocText = (LPWSTR) HeapAlloc(GetProcessHeap(), 0, (dwCharCount + 1) * sizeof(WCHAR));
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if (!pszAllocText)
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goto done;
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if ((dwSize - dwPos) > 0)
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{
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if (!MultiByteToWideChar(iCodePage, 0, (LPCSTR)&pBytes[dwPos], dwSize - dwPos, pszAllocText, dwCharCount))
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goto done;
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}
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pszAllocText[dwCharCount] = '\0';
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pszText = pszAllocText;
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break;
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DEFAULT_UNREACHABLE;
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}
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dwPos = 0;
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for (i = 0; i < dwCharCount; i++)
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{
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switch(pszText[i])
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{
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case '\r':
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if ((i < dwCharCount-1) && (pszText[i+1] == '\n'))
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{
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i++;
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adwEolnCount[EOLN_CRLF]++;
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break;
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}
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/* fall through */
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case '\n':
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if (!Append(ppszText, pdwTextLen, &pszText[dwPos], i - dwPos))
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return FALSE;
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if (!Append(ppszText, pdwTextLen, szCrlf, ARRAY_SIZE(szCrlf)))
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return FALSE;
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dwPos = i + 1;
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if (pszText[i] == '\r')
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adwEolnCount[EOLN_CR]++;
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else
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adwEolnCount[EOLN_LF]++;
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break;
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case '\0':
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pszText[i] = ' ';
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break;
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}
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}
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if (!*ppszText && (pszText == pszAllocText))
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{
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/* special case; don't need to reallocate */
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*ppszText = pszAllocText;
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*pdwTextLen = dwCharCount;
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pszAllocText = NULL;
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}
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else
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{
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/* append last remaining text */
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if (!Append(ppszText, pdwTextLen, &pszText[dwPos], i - dwPos + 1))
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return FALSE;
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}
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/* chose which eoln to use */
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*piEoln = EOLN_CRLF;
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if (adwEolnCount[EOLN_LF] > adwEolnCount[*piEoln])
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*piEoln = EOLN_LF;
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if (adwEolnCount[EOLN_CR] > adwEolnCount[*piEoln])
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*piEoln = EOLN_CR;
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*pencFile = encFile;
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bSuccess = TRUE;
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done:
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if (pBytes)
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HeapFree(GetProcessHeap(), 0, pBytes);
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if (pszAllocText)
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HeapFree(GetProcessHeap(), 0, pszAllocText);
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if (!bSuccess && *ppszText)
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{
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HeapFree(GetProcessHeap(), 0, *ppszText);
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*ppszText = NULL;
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*pdwTextLen = 0;
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}
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return bSuccess;
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}
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static BOOL WriteEncodedText(HANDLE hFile, LPCWSTR pszText, DWORD dwTextLen, ENCODING encFile)
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{
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LPBYTE pBytes = NULL;
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LPBYTE pAllocBuffer = NULL;
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DWORD dwPos = 0;
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DWORD dwByteCount;
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BYTE buffer[1024];
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UINT iCodePage = 0;
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DWORD dwDummy, i;
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BOOL bSuccess = FALSE;
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int iBufferSize, iRequiredBytes;
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BYTE b;
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while(dwPos < dwTextLen)
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{
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switch(encFile)
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{
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case ENCODING_UTF16LE:
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pBytes = (LPBYTE) &pszText[dwPos];
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dwByteCount = (dwTextLen - dwPos) * sizeof(WCHAR);
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dwPos = dwTextLen;
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break;
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case ENCODING_UTF16BE:
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dwByteCount = (dwTextLen - dwPos) * sizeof(WCHAR);
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if (dwByteCount > sizeof(buffer))
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dwByteCount = sizeof(buffer);
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memcpy(buffer, &pszText[dwPos], dwByteCount);
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for (i = 0; i < dwByteCount; i += 2)
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{
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b = buffer[i+0];
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buffer[i+0] = buffer[i+1];
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buffer[i+1] = b;
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}
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pBytes = (LPBYTE) &buffer[dwPos];
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dwPos += dwByteCount / sizeof(WCHAR);
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break;
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case ENCODING_ANSI:
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case ENCODING_UTF8:
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if (encFile == ENCODING_ANSI)
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iCodePage = CP_ACP;
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else if (encFile == ENCODING_UTF8)
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iCodePage = CP_UTF8;
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iRequiredBytes = WideCharToMultiByte(iCodePage, 0, &pszText[dwPos], dwTextLen - dwPos, NULL, 0, NULL, NULL);
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if (iRequiredBytes <= 0)
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{
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goto done;
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}
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else if (iRequiredBytes < sizeof(buffer))
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{
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pBytes = buffer;
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iBufferSize = sizeof(buffer);
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}
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else
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{
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pAllocBuffer = (LPBYTE) HeapAlloc(GetProcessHeap(), 0, iRequiredBytes);
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if (!pAllocBuffer)
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return FALSE;
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pBytes = pAllocBuffer;
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iBufferSize = iRequiredBytes;
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}
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dwByteCount = WideCharToMultiByte(iCodePage, 0, &pszText[dwPos], dwTextLen - dwPos, (LPSTR) pBytes, iBufferSize, NULL, NULL);
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if (!dwByteCount)
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goto done;
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dwPos = dwTextLen;
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break;
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default:
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goto done;
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}
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if (!WriteFile(hFile, pBytes, dwByteCount, &dwDummy, NULL))
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goto done;
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/* free the buffer, if we have allocated one */
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if (pAllocBuffer)
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{
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HeapFree(GetProcessHeap(), 0, pAllocBuffer);
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pAllocBuffer = NULL;
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}
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}
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bSuccess = TRUE;
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done:
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if (pAllocBuffer)
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HeapFree(GetProcessHeap(), 0, pAllocBuffer);
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return bSuccess;
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}
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BOOL WriteText(HANDLE hFile, LPCWSTR pszText, DWORD dwTextLen, ENCODING encFile, int iEoln)
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{
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WCHAR wcBom;
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LPCWSTR pszLF = L"\n";
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DWORD dwPos, dwNext;
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/* Write the proper byte order marks if not ANSI */
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if (encFile != ENCODING_ANSI)
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{
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wcBom = 0xFEFF;
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if (!WriteEncodedText(hFile, &wcBom, 1, encFile))
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return FALSE;
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}
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dwPos = 0;
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/* pszText eoln are always \r\n */
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do
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{
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/* Find the next eoln */
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dwNext = dwPos;
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while(dwNext < dwTextLen)
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{
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if (pszText[dwNext] == '\r' && pszText[dwNext + 1] == '\n')
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break;
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dwNext++;
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}
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if (dwNext != dwTextLen)
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{
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switch (iEoln)
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{
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case EOLN_LF:
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/* Write text (without eoln) */
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if (!WriteEncodedText(hFile, &pszText[dwPos], dwNext - dwPos, encFile))
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return FALSE;
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/* Write eoln */
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if (!WriteEncodedText(hFile, pszLF, 1, encFile))
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return FALSE;
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break;
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case EOLN_CR:
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/* Write text (including \r as eoln) */
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if (!WriteEncodedText(hFile, &pszText[dwPos], dwNext - dwPos + 1, encFile))
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return FALSE;
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break;
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case EOLN_CRLF:
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/* Write text (including \r\n as eoln) */
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if (!WriteEncodedText(hFile, &pszText[dwPos], dwNext - dwPos + 2, encFile))
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return FALSE;
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break;
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default:
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return FALSE;
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}
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}
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else
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{
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/* Write text (without eoln, since this is the end of the file) */
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if (!WriteEncodedText(hFile, &pszText[dwPos], dwNext - dwPos, encFile))
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return FALSE;
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}
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/* Skip \r\n */
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dwPos = dwNext + 2;
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}
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while (dwPos < dwTextLen);
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return TRUE;
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}
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