599 lines
19 KiB
C++
599 lines
19 KiB
C++
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//---------------------------------------------------------------------------
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//
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// Copyright (c) Microsoft Corporation
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//
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// File: findapp.cpp
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//
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// Implements hueristics to find the folder of an application
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//
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// History:
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// 2-17-98 by dli implemented FindAppFolder
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// 5-01-98 added lots of little functioins
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//------------------------------------------------------------------------
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#include "priv.h"
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// Do not build this file if on Win9X or NT4
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#ifndef DOWNLEVEL_PLATFORM
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#include "appwiz.h"
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#include "appsize.h"
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#include "findapp.h"
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#include "util.h"
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// Things to do:
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// 1. Move special strings into the RC file
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/*-------------------------------------------------------------------------
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Purpose: This function searches and returns the sub word (if one is found).
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pszStr is the big string, pszSrch is the candidate substring used
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in the search.
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Returns NULL if no subword is found.
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*/
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LPCTSTR FindSubWord(LPCTSTR pszStr, LPCTSTR pszSrch)
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{
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LPCTSTR pszRet = NULL;
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LPCTSTR pszBegin = pszStr;
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// Search for the sub string from the beginning
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LPCTSTR pszSub;
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while (NULL != (pszSub = StrStrI(pszBegin, pszSrch)))
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{
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LPCTSTR pszPrev;
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LPCTSTR pszEnd = pszSub + lstrlen(pszSrch);
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// Is the previous character alphanumeric?
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if (pszSub != pszBegin)
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{
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ASSERT(pszSub > pszBegin);
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pszPrev = CharPrev(pszBegin, pszSub);
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ASSERT(pszPrev >= pszBegin);
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if (IsCharAlphaNumeric(*pszPrev))
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{
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// yes, go on searching
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pszBegin = pszEnd;
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continue;
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}
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}
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// Is the character after the sub string we found
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// alpha numeric?
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if (IsCharAlphaNumeric(*pszEnd))
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{
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// yes, go on searching
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pszBegin = pszEnd;
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continue;
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}
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// No to both questions above, it is a sub word!!
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pszRet = pszSub;
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break;
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}
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return pszRet;
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}
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int MatchMultipleSubWords(LPCTSTR pszStr, LPCTSTR pszSubWords)
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{
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if (!StrChrI(pszSubWords, TEXT(' ')))
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return 0;
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TCHAR szSubWords[MAX_PATH];
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lstrcpy(szSubWords, pszSubWords);
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LPTSTR pszStart = szSubWords;
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LPTSTR pszSpace;
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int iNumMatches = 0;
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while (pszSpace = StrChrI(pszStart, TEXT(' ')))
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{
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*pszSpace = 0;
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if (FindSubWord(pszStr, pszStart))
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iNumMatches++;
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pszStart = ++pszSpace;
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}
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if (FindSubWord(pszStr, pszStart))
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iNumMatches++;
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return iNumMatches;
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}
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/*-------------------------------------------------------------------------
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Purpose: Removes the spaces from pszPath, including spaces in the middle
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of the folder or filespec. The resulting string is placed in
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pszBuf.
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Example:
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(before)
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"C:\Program Files\Microsoft Office\Word.exe"
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(after)
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"C:\ProgramFiles\MicrosoftOffice\Word.exe"
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*/
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void PathRemoveSpaces(LPCTSTR pszPath, LPTSTR pszBuf, int cchBuf)
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{
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ASSERT(IS_VALID_STRING_PTR(pszPath, -1));
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ASSERT(IS_VALID_WRITE_BUFFER(pszBuf, TCHAR, cchBuf));
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--cchBuf; // Leave room for terminating NUL.
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while(0 < cchBuf && TEXT('\0') != *pszPath)
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{
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//
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// Skip beyond spaces.
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//
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while(TEXT(' ') == *pszPath)
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++pszPath;
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if (TEXT('\0') != *pszPath)
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{
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//
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// Copy to output.
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//
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*pszBuf++ = *pszPath++;
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--cchBuf;
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}
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}
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*pszBuf = TEXT('\0');
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}
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// Returns TRUE if all chars in pszCharGroup is in pszString
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BOOL AllCharsInString(LPCTSTR pszString, LPCTSTR pszCharGroup)
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{
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if (!pszCharGroup || !pszCharGroup[0])
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return FALSE;
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LPCTSTR pszT = pszCharGroup;
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while (*pszT && StrChrI(pszString, *pszT))
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pszT++;
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return (*pszT == 0) ? TRUE : FALSE;
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}
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/*-------------------------------------------------------------------------
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Purpose: Given the full name (and sometimes the short name) of the app,
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this function determines whether the given pszName is a match.
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If bStrict is TRUE, the heuristic skips the slinky checks.
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Returns a ranking of the accuracy of the match:
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MATCH_LEVEL_NOMATCH - pszName does not match whatsoever
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MATCH_LEVEL_LOW - pszName somewhat matches
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MATCH_LEVEL_NORMAL - pszName matches pretty good
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MATCH_LEVEL_HIGH - pszName definitely matches
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*/
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int MatchAppNameExact(
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LPCTSTR pszName,
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LPCTSTR pszAppFullName,
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LPCTSTR pszAppShortName,
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BOOL bStrict)
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{
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TraceMsg(TF_FINDAPP, "MatchAppName ---- %s | %s | %s ", pszName, pszAppShortName, pszAppFullName);
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ASSERT(IS_VALID_STRING_PTR(pszName, -1));
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// In the heuristic below, we never degrade from a better match
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// to a lower match.
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int iMatch = MATCH_LEVEL_NOMATCH;
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// Since the long fullname has the most accuracy, check that first.
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if (pszAppFullName && *pszAppFullName)
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{
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// Is pszName equivalent to the full name of the app?
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if (!lstrcmpi(pszAppFullName, pszName))
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iMatch = MATCH_LEVEL_HIGH; // Yes, definitely a high match
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else
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{
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// No, okay let's see if there are multiple (> 1) number of sub
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// words from pszName that match the subwords in the app's full name
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int iSubMatches = MatchMultipleSubWords(pszAppFullName, pszName);
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// More than three matches, definitely high match
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// NOTE: there could be a risk here, but I have not found a
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// counter example yet.
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if (iSubMatches > 3)
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iMatch = MATCH_LEVEL_HIGH;
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// NOTE: there is a risk here. For example:
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//
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// Microsoft Internet Explorer Setup Files vs.
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// Microsoft Internet Explorer ...
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else if ((iSubMatches > 1) && (!bStrict || (iSubMatches > 2)))
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iMatch = MATCH_LEVEL_NORMAL;
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// All these are turned off if we have a strict matching
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else if (!bStrict)
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{
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// If the potential folder name is a subset of the full name or
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// if all of the characters of the potential folder name can
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// be found in the full name, we have a low match
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// (Counter Ex: Microsoft vs. Microsoft Office)
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// NOTE: The reason for AllCharsInString is to detect case like
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// Ex: "PM65 vs. Adobe Page Maker 6.5"
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// There might be a risk in this, but I have not found a counter
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// example, yet.
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if (StrStrI(pszAppFullName, pszName) || AllCharsInString(pszAppFullName, pszName))
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iMatch = MATCH_LEVEL_LOW;
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}
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}
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}
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// Association between folder name and the reg key name(short name)
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// This is given second priority because the reg key name is unreliable (could be an ID)
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if (MATCH_LEVEL_HIGH > iMatch && pszAppShortName && *pszAppShortName)
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{
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// Does the string exactly match the app's shortname?
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if (!lstrcmpi(pszAppShortName, pszName))
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iMatch = MATCH_LEVEL_HIGH; // yes
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// All these are turned off if we have strict matching
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else if (!bStrict)
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{
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// Does the string contain the app's shortname?
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if (iMatch < MATCH_LEVEL_NORMAL && StrStrI(pszName, pszAppShortName))
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iMatch = MATCH_LEVEL_NORMAL; // yes
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// Or does the app's shortname contain the string?
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else if (iMatch < MATCH_LEVEL_LOW && StrStrI(pszAppShortName, pszName))
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iMatch = MATCH_LEVEL_LOW; // yes
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}
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}
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return iMatch;
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}
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/*-------------------------------------------------------------------------
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Purpose: This function tries some different heuristics to see how well
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pszCandidate matches the given variations of the app name
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(short and long names).
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If bStrict is TRUE, the heuristic skips the slinky checks.
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Returns a ranking of the accuracy of the match:
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MATCH_LEVEL_NOMATCH - pszName does not match whatsoever
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MATCH_LEVEL_LOW - pszName somewhat matches
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MATCH_LEVEL_NORMAL - pszName matches pretty good
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MATCH_LEVEL_HIGH - pszName definitely matches
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*/
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int MatchAppName(
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LPCTSTR pszCandidate,
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LPCTSTR pszAppFullName,
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LPCTSTR pszAppShortName, OPTIONAL
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BOOL bStrict)
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{
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int iMatch = MATCH_LEVEL_NOMATCH;
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if (pszCandidate && *pszCandidate)
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{
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// Clean up all the strings MAX_PATH+1, in this case, we only stick a
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// ' ' on
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TCHAR szCleanFolderName[MAX_PATH+1];
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InsertSpaceBeforeVersion(pszCandidate, szCleanFolderName);
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// Now match the exact name
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iMatch = MatchAppNameExact(szCleanFolderName, pszAppFullName, pszAppShortName, bStrict);
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// Is there still no match, and do we have some flexibility to fudge?
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if (!bStrict)
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{
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int iNewMatch = MATCH_LEVEL_NOMATCH;
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// Yes; try finding it without the spaces in the filename and paths
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TCHAR szCandidate[MAX_PATH];
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TCHAR szFullName[MAX_PATH];
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TCHAR szShortName[MAX_PATH];
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PathRemoveSpaces(pszCandidate, szCandidate, ARRAYSIZE(szCandidate));
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PathRemoveSpaces(pszAppFullName, szFullName, ARRAYSIZE(szFullName));
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if (pszAppShortName && pszAppShortName[0])
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{
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PathRemoveSpaces(pszAppShortName, szShortName, ARRAYSIZE(szShortName));
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pszAppShortName = szShortName;
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}
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iNewMatch = MatchAppNameExact(szCandidate, szFullName, pszAppShortName, bStrict);
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if (iNewMatch > iMatch)
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iMatch = iNewMatch;
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}
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}
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return iMatch;
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}
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// This function returns a pointer to the beginning of the right most string
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// which looks like folder path. This only looks for paths with fixed drive
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// letters.
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//
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// NOTES:
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// 1. This funcion damages pszString
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// 2. We are really cracking the string, what happens
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// in localized versions? Are these going to be international char strings?
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//
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// Returns NULL if it could not find a legit-looking path.
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LPTSTR GetRightMostFolderPathInString(LPTSTR pszString)
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{
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// Reverse find the ':' in the path
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LPTSTR pszRoot = StrRChr(pszString, NULL, TEXT(':'));
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// Make sure what we found is not at the beginning of the whole
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// string or the last character of the string
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if (pszRoot && (pszRoot > pszString) && (*CharNext(pszRoot) == TEXT('\\')))
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{
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// Okay, now move back one, we should be pointing to the drive letter
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pszRoot--; // Don't have to use CharPrev since we're on a ':'
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TCHAR szDrive[2];
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szDrive[0] = *pszRoot;
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szDrive[1] = 0;
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CharUpper(szDrive);
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if ((szDrive[0] >= TEXT('C')) && (szDrive[0] <= TEXT('Z')))
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{
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// Yes, it is a real drive letter
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TCHAR atch[4];
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wsprintf(atch, TEXT("%c:\\"), *pszRoot);
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// We are only interested in fixed drives and let's check the path
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if (GetDriveType(atch) == DRIVE_FIXED)
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{
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PathRemoveFileSpec(pszRoot);
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return pszRoot;
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}
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}
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}
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return NULL;
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}
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// Given a full path, an app name, an app short name, finds the best match in this path
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// EX: App Name: Microsoft Office Short Name: Office
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// C:\Microsoft Office\Office --> C:\Microsoft Office
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int FindBestMatch(
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LPCTSTR pszFolder,
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LPCTSTR pszAppFullName,
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LPCTSTR pszAppShortName,
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BOOL bStrict,
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LPTSTR pszResult)
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{
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// This can't be a root directory
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ASSERT(!PathIsRoot(pszFolder));
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int iBest = MATCH_LEVEL_NOMATCH;
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int iPre = MATCH_LEVEL_NOMATCH;
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int iThis = MATCH_LEVEL_NOMATCH;
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TCHAR szPrefix[MAX_PATH];
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lstrcpy(szPrefix, pszFolder);
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if (PathRemoveFileSpec(szPrefix) && !PathIsRoot(szPrefix))
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iPre = FindBestMatch(szPrefix, pszAppFullName, pszAppShortName, bStrict, pszResult);
|
||
|
|
|
||
|
|
LPTSTR pszName = PathFindFileName(pszFolder);
|
||
|
|
if (pszName)
|
||
|
|
iThis = MatchAppName(pszName, pszAppFullName, pszAppShortName, bStrict);
|
||
|
|
|
||
|
|
iBest = (iPre > iThis) ? iPre : iThis;
|
||
|
|
|
||
|
|
// In case there is both match in the current folder and the previous folder
|
||
|
|
// take this current one because:
|
||
|
|
// 1. This folder is closer to the "Uninstall" or "Modify" string
|
||
|
|
// 2. It costs less to walk this folder;
|
||
|
|
if ((iThis > MATCH_LEVEL_NOMATCH) && (iThis >= iPre))
|
||
|
|
lstrcpy(pszResult, pszFolder);
|
||
|
|
|
||
|
|
return iBest;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/*--------------------------------------------------------------------------
|
||
|
|
Purpose: Given a file name or a folder name, compare it with our list of setup
|
||
|
|
app names.
|
||
|
|
|
||
|
|
NOTE: the comparason are done as the following: We compare the name with the first portion
|
||
|
|
and the last portion of our setup name EX:
|
||
|
|
name --> myuninst.exe or uninstall.exe
|
||
|
|
Setup Name --> uninst
|
||
|
|
|
||
|
|
should bother return TRUE
|
||
|
|
*/
|
||
|
|
BOOL IsFileOrFolderSetup(LPTSTR pszName, LPCTSTR pszDoubleString)
|
||
|
|
{
|
||
|
|
ASSERT(pszName);
|
||
|
|
ASSERT(pszDoubleString);
|
||
|
|
|
||
|
|
BOOL bRet = FALSE;
|
||
|
|
|
||
|
|
// Neither pszName of pszDoubleString should be NULL
|
||
|
|
if (pszName && pszDoubleString)
|
||
|
|
{
|
||
|
|
PathRemoveExtension(pszName);
|
||
|
|
int cchName = lstrlen(pszName);
|
||
|
|
LPCTSTR pszT = pszDoubleString;
|
||
|
|
while (*pszT)
|
||
|
|
{
|
||
|
|
int cch = lstrlen(pszT);
|
||
|
|
// NOTE: we compare from the beginning and from the end
|
||
|
|
if (!StrCmpNI(pszName, pszT, cch) ||
|
||
|
|
((cchName > cch) && !StrCmpNI(pszName + cchName - cch, pszT, cch)))
|
||
|
|
{
|
||
|
|
bRet = TRUE;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
pszT += lstrlen(pszT) + 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return bRet;
|
||
|
|
}
|
||
|
|
/*-------------------------------------------------------------------------
|
||
|
|
Purpose: Sniffs the pszFolder for any signs that the path refers to a setup
|
||
|
|
program. Paths that have foldernames or filespecs with the word
|
||
|
|
"setup" or "install" are suspect. Returns TRUE if it looks like
|
||
|
|
it might be a setup app or folder.
|
||
|
|
|
||
|
|
An example is "c:\program files\microsoft office\office\setup\outlook\olmaint.exe".
|
||
|
|
This function will return TRUE because "setup" is one of the parent
|
||
|
|
folder names.
|
||
|
|
|
||
|
|
cStripLevel means how many levels we will go up the directory ladder
|
||
|
|
*/
|
||
|
|
BOOL PathIsSetup(LPCTSTR pszFolder, int cStripLevel)
|
||
|
|
{
|
||
|
|
ASSERT(IS_VALID_STRING_PTR(pszFolder, -1));
|
||
|
|
ASSERT(cStripLevel > 0);
|
||
|
|
|
||
|
|
BOOL bRet = FALSE;
|
||
|
|
TCHAR szPath[MAX_PATH];
|
||
|
|
TCHAR szName[MAX_PATH];
|
||
|
|
lstrcpy(szPath, pszFolder);
|
||
|
|
|
||
|
|
static TCHAR s_szNames[MAX_PATH];
|
||
|
|
static BOOL s_bNamesLoaded = FALSE;
|
||
|
|
|
||
|
|
if (!s_bNamesLoaded)
|
||
|
|
{
|
||
|
|
LoadAndStrip(IDS_SETUPAPPNAMES, s_szNames, ARRAYSIZE(s_szNames));
|
||
|
|
s_bNamesLoaded = TRUE;
|
||
|
|
}
|
||
|
|
|
||
|
|
LPTSTR pszName;
|
||
|
|
int iStripLevel = cStripLevel;
|
||
|
|
while ((iStripLevel-- > 0) && (NULL != (pszName = PathFindFileName(szPath))))
|
||
|
|
{
|
||
|
|
lstrcpy(szName, pszName);
|
||
|
|
if (IsFileOrFolderSetup(szName, s_szNames))
|
||
|
|
{
|
||
|
|
bRet = TRUE;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
else if (!PathRemoveFileSpec(szPath) || PathIsRoot(szPath))
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return bRet;
|
||
|
|
}
|
||
|
|
|
||
|
|
BOOL PathIsCommonFiles(LPCTSTR pszPath)
|
||
|
|
{
|
||
|
|
TCHAR szCommonFiles[MAX_PATH];
|
||
|
|
TCHAR szShortCommonFiles[MAX_PATH];
|
||
|
|
|
||
|
|
ASSERT(IS_VALID_STRING_PTR(pszPath, -1));
|
||
|
|
|
||
|
|
// This definitely need to be put in the RC file
|
||
|
|
wsprintf(szCommonFiles, TEXT("%c:\\Program Files\\Common Files"), pszPath[0]);
|
||
|
|
|
||
|
|
BOOL bShort = GetShortPathName(szCommonFiles, szShortCommonFiles, ARRAYSIZE(szShortCommonFiles));
|
||
|
|
if (bShort)
|
||
|
|
{
|
||
|
|
ASSERT(szShortCommonFiles[0] == szCommonFiles[0]);
|
||
|
|
}
|
||
|
|
|
||
|
|
return PathIsPrefix(szCommonFiles, pszPath) || (bShort && PathIsPrefix(szShortCommonFiles, pszPath));
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// returns TRUE if windows directory is the prefix of pszPath
|
||
|
|
BOOL PathIsUnderWindows(LPCTSTR pszPath)
|
||
|
|
{
|
||
|
|
TCHAR szWindows[MAX_PATH];
|
||
|
|
|
||
|
|
if (GetWindowsDirectory(szWindows, ARRAYSIZE(szWindows)))
|
||
|
|
{
|
||
|
|
// Is this path somewhere below the windows directory?
|
||
|
|
return PathIsPrefix(szWindows, pszPath);
|
||
|
|
}
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*-------------------------------------------------------------------------
|
||
|
|
Purpose: This function looks for a valid-looking path in the given pszInfo
|
||
|
|
string that may indicate where the app is installed. This attempts
|
||
|
|
to weed out suspect paths like references to setup programs in
|
||
|
|
other folders.
|
||
|
|
|
||
|
|
Returns TRUE if a useful path was found. pszOut will contain the
|
||
|
|
path.
|
||
|
|
*/
|
||
|
|
BOOL ParseInfoString(LPCTSTR pszInfo, LPCTSTR pszFullName, LPCTSTR pszShortName, LPTSTR pszOut)
|
||
|
|
{
|
||
|
|
ASSERT(IS_VALID_STRING_PTR(pszInfo, -1));
|
||
|
|
ASSERT(IS_VALID_STRING_PTR(pszFullName, -1));
|
||
|
|
ASSERT(pszOut);
|
||
|
|
|
||
|
|
*pszOut = 0;
|
||
|
|
|
||
|
|
// if it starts with rundll, forget it!
|
||
|
|
if (!StrCmpNI(pszInfo, TEXT("rundll"), SIZECHARS(TEXT("rundll"))))
|
||
|
|
return FALSE;
|
||
|
|
|
||
|
|
// more strings we bail on ...
|
||
|
|
|
||
|
|
TCHAR szInfoT[MAX_INFO_STRING];
|
||
|
|
lstrcpyn(szInfoT, pszInfo, SIZECHARS(szInfoT));
|
||
|
|
|
||
|
|
// The algorithm: we crack the string, and go from the right most path inside the string
|
||
|
|
// to the left most one by one and guess which one is a more reasonable
|
||
|
|
LPTSTR pszFolder;
|
||
|
|
while (NULL != (pszFolder = GetRightMostFolderPathInString(szInfoT)))
|
||
|
|
{
|
||
|
|
TCHAR szFullPath[MAX_PATH];
|
||
|
|
// GetLongPathName does not work on Win 95
|
||
|
|
if (StrChrI(pszFolder, TEXT('\\')) && GetLongPathName(pszFolder, szFullPath, ARRAYSIZE(szFullPath)))
|
||
|
|
{
|
||
|
|
// Make sure this actually is a path and not a root drive
|
||
|
|
if (PathIsDirectory(szFullPath) && !PathIsRoot(szFullPath) && !PathIsUnderWindows(szFullPath))
|
||
|
|
{
|
||
|
|
// No; then we'll consider it
|
||
|
|
|
||
|
|
LPTSTR pszFolderName;
|
||
|
|
BOOL bStop = FALSE;
|
||
|
|
// Find out the last folder name
|
||
|
|
// If it is "setup" or "install", move up until it's not or we can't move up any more
|
||
|
|
while(NULL != (pszFolderName = PathFindFileName(szFullPath)) &&
|
||
|
|
PathIsSetup(pszFolderName, 1))
|
||
|
|
{
|
||
|
|
// Have we reached the root of the path?
|
||
|
|
if (!PathRemoveFileSpec(szFullPath) || PathIsRoot(szFullPath))
|
||
|
|
{
|
||
|
|
// Yes; don't go any further
|
||
|
|
bStop = TRUE;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// We still reject those strings with "setup" or "install" in the middle,
|
||
|
|
// or those under the program files common files
|
||
|
|
if (!bStop && !PathIsRoot(szFullPath) &&
|
||
|
|
!PathIsSetup(szFullPath, 3) && !PathIsCommonFiles(szFullPath))
|
||
|
|
{
|
||
|
|
if (MATCH_LEVEL_NOMATCH < FindBestMatch(szFullPath, pszFullName, pszShortName, FALSE, pszOut))
|
||
|
|
return TRUE;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
*pszFolder = 0;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
return FALSE;
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif //DOWNLEVEL_PLATFORM
|