mirror of
https://github.com/reactos/reactos.git
synced 2024-08-30 23:28:58 +00:00
464 lines
13 KiB
C
464 lines
13 KiB
C
/*
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* PROJECT: ReactOS Notepad
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* LICENSE: LGPL-2.1-or-later (https://spdx.org/licenses/LGPL-2.1-or-later)
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* PURPOSE: Providing a Windows-compatible simple text editor for ReactOS
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* COPYRIGHT: 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 2019-2023 Katayama Hirofumi MZ <katayama.hirofumi.mz@gmail.com>
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*/
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#include "notepad.h"
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#include <assert.h>
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static BOOL IsTextNonZeroASCII(LPCVOID pText, DWORD dwSize)
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{
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const signed char *pch = pText;
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while (dwSize-- > 0)
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{
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if (*pch <= 0)
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return FALSE;
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++pch;
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}
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return TRUE;
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}
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static ENCODING AnalyzeEncoding(const BYTE *pBytes, DWORD dwSize)
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{
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INT flags = IS_TEXT_UNICODE_STATISTICS | IS_TEXT_UNICODE_REVERSE_STATISTICS;
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if (IsTextNonZeroASCII(pBytes, dwSize))
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return ENCODING_DEFAULT;
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if (IsTextUnicode(pBytes, dwSize, &flags))
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return ENCODING_UTF16LE;
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if (((flags & IS_TEXT_UNICODE_REVERSE_MASK) == IS_TEXT_UNICODE_REVERSE_STATISTICS))
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return ENCODING_UTF16BE;
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/* is it UTF-8? */
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if (MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, (LPCSTR)pBytes, dwSize, NULL, 0))
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return ENCODING_UTF8;
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return ENCODING_ANSI;
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}
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static VOID
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ReplaceNewLines(LPWSTR pszNew, SIZE_T cchNew, LPCWSTR pszOld, SIZE_T cchOld)
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{
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BOOL bPrevCR = FALSE;
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SIZE_T ichNew, ichOld;
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for (ichOld = ichNew = 0; ichOld < cchOld; ++ichOld)
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{
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WCHAR ch = pszOld[ichOld];
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if (ch == L'\n')
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{
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if (!bPrevCR)
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{
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pszNew[ichNew++] = L'\r';
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pszNew[ichNew++] = L'\n';
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}
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}
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else if (ch == '\r')
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{
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pszNew[ichNew++] = L'\r';
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pszNew[ichNew++] = L'\n';
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}
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else
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{
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pszNew[ichNew++] = ch;
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}
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bPrevCR = (ch == L'\r');
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}
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pszNew[ichNew] = UNICODE_NULL;
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assert(ichNew == cchNew);
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}
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static BOOL
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ProcessNewLinesAndNulls(HLOCAL *phLocal, LPWSTR *ppszText, SIZE_T *pcchText, EOLN *piEoln)
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{
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SIZE_T ich, cchText = *pcchText, adwEolnCount[3] = { 0, 0, 0 }, cNonCRLFs;
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LPWSTR pszText = *ppszText;
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EOLN iEoln;
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BOOL bPrevCR = FALSE;
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/* Replace '\0' with SPACE. Count newlines. */
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for (ich = 0; ich < cchText; ++ich)
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{
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WCHAR ch = pszText[ich];
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if (ch == UNICODE_NULL)
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pszText[ich] = L' ';
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if (ch == L'\n')
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{
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if (bPrevCR)
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{
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adwEolnCount[EOLN_CR]--;
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adwEolnCount[EOLN_CRLF]++;
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}
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else
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{
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adwEolnCount[EOLN_LF]++;
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}
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}
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else if (ch == '\r')
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{
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adwEolnCount[EOLN_CR]++;
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}
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bPrevCR = (ch == L'\r');
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}
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/* Choose the newline code */
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if (adwEolnCount[EOLN_CR] > adwEolnCount[EOLN_CRLF])
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iEoln = EOLN_CR;
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else if (adwEolnCount[EOLN_LF] > adwEolnCount[EOLN_CRLF])
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iEoln = EOLN_LF;
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else
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iEoln = EOLN_CRLF;
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cNonCRLFs = adwEolnCount[EOLN_CR] + adwEolnCount[EOLN_LF];
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if (cNonCRLFs != 0)
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{
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/* Allocate a buffer for EM_SETHANDLE */
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SIZE_T cchNew = cchText + cNonCRLFs;
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HLOCAL hLocal = LocalAlloc(LMEM_MOVEABLE, (cchNew + 1) * sizeof(WCHAR));
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LPWSTR pszNew = LocalLock(hLocal);
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if (!pszNew)
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{
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LocalFree(hLocal);
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return FALSE; /* Failure */
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}
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ReplaceNewLines(pszNew, cchNew, pszText, cchText);
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/* Replace with new data */
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LocalUnlock(*phLocal);
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LocalFree(*phLocal);
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*phLocal = hLocal;
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*ppszText = pszNew;
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*pcchText = cchNew;
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}
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*piEoln = iEoln;
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return TRUE;
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}
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BOOL
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ReadText(HANDLE hFile, HLOCAL *phLocal, ENCODING *pencFile, EOLN *piEoln)
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{
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LPBYTE pBytes = NULL;
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LPWSTR pszText, pszNewText = NULL;
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DWORD dwSize, dwPos;
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SIZE_T i, cchText, cbContent;
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BOOL bSuccess = FALSE;
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ENCODING encFile;
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UINT iCodePage;
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HANDLE hMapping = INVALID_HANDLE_VALUE;
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HLOCAL hNewLocal;
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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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if (dwSize == 0) // If file is empty
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{
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hNewLocal = LocalReAlloc(*phLocal, sizeof(UNICODE_NULL), LMEM_MOVEABLE);
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pszNewText = LocalLock(hNewLocal);
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if (hNewLocal == NULL || pszNewText == NULL)
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goto done;
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*pszNewText = UNICODE_NULL;
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LocalUnlock(hNewLocal);
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*phLocal = hNewLocal;
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*piEoln = EOLN_CRLF;
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*pencFile = ENCODING_DEFAULT;
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return TRUE;
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}
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hMapping = CreateFileMappingW(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
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if (hMapping == NULL)
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goto done;
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pBytes = MapViewOfFile(hMapping, FILE_MAP_READ, 0, 0, dwSize);
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if (!pBytes)
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goto done;
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/* Look for Byte Order Marks */
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dwPos = 0;
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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_UTF8BOM;
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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(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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case ENCODING_UTF16LE:
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{
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/* Re-allocate the buffer for EM_SETHANDLE */
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pszText = (LPWSTR) &pBytes[dwPos];
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cchText = (dwSize - dwPos) / sizeof(WCHAR);
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hNewLocal = LocalReAlloc(*phLocal, (cchText + 1) * sizeof(WCHAR), LMEM_MOVEABLE);
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pszNewText = LocalLock(hNewLocal);
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if (pszNewText == NULL)
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goto done;
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*phLocal = hNewLocal;
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CopyMemory(pszNewText, pszText, cchText * sizeof(WCHAR));
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if (encFile == ENCODING_UTF16BE) /* big endian; Swap bytes */
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{
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BYTE tmp, *pb = (LPBYTE)pszNewText;
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for (i = 0; i < cchText * 2; i += 2)
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{
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tmp = pb[i];
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pb[i] = pb[i + 1];
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pb[i + 1] = tmp;
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}
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}
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break;
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}
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case ENCODING_ANSI:
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case ENCODING_UTF8:
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case ENCODING_UTF8BOM:
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{
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iCodePage = ((encFile == ENCODING_UTF8 || encFile == ENCODING_UTF8BOM) ? CP_UTF8 : CP_ACP);
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/* Get ready for ANSI-to-Wide conversion */
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cbContent = dwSize - dwPos;
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cchText = 0;
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if (cbContent > 0)
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{
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cchText = MultiByteToWideChar(iCodePage, 0, (LPCSTR)&pBytes[dwPos], (INT)cbContent, NULL, 0);
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if (cchText == 0)
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goto done;
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}
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/* Re-allocate the buffer for EM_SETHANDLE */
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hNewLocal = LocalReAlloc(*phLocal, (cchText + 1) * sizeof(WCHAR), LMEM_MOVEABLE);
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pszNewText = LocalLock(hNewLocal);
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if (!pszNewText)
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goto done;
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*phLocal = hNewLocal;
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/* Do ANSI-to-Wide conversion */
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if (cbContent > 0)
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{
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if (!MultiByteToWideChar(iCodePage, 0, (LPCSTR)&pBytes[dwPos], (INT)cbContent,
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pszNewText, (INT)cchText))
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{
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goto done;
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}
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}
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break;
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}
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DEFAULT_UNREACHABLE;
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}
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pszNewText[cchText] = UNICODE_NULL;
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if (!ProcessNewLinesAndNulls(phLocal, &pszNewText, &cchText, piEoln))
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goto done;
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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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UnmapViewOfFile(pBytes);
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if (hMapping != INVALID_HANDLE_VALUE)
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CloseHandle(hMapping);
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if (pszNewText)
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LocalUnlock(*phLocal);
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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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case ENCODING_UTF8BOM:
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if (encFile == ENCODING_UTF8 || encFile == ENCODING_UTF8BOM)
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iCodePage = CP_UTF8;
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else
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iCodePage = CP_ACP;
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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, EOLN 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 or UTF-8 without BOM */
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if (encFile != ENCODING_ANSI && encFile != ENCODING_UTF8)
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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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