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windows-nt/Source/XPSP1/NT/admin/wmi/wbem/winmgmt/stdprov/general.cpp

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/*++
Copyright (C) 1995-2001 Microsoft Corporation
Module Name:
GENERAL.CPP
Abstract:
Containes some general purpose classes
which are of use to serveral providers.
Specifically, this contains the code for
the classes used to cache open handles and
the classes used to parse the mapping strings.
History:
a-davj 11-Nov-95 Created.
--*/
#include "precomp.h"
#include <tchar.h>
//***************************************************************************
//
// CEntry::CEntry()
//
// DESCRIPTION:
//
// Constructor.
//
//***************************************************************************
CEntry::CEntry()
{
hHandle = NULL;
sPath.Empty();
}
//***************************************************************************
//
// CEntry::~CEntry()
//
// DESCRIPTION:
//
// Destructor.
//
//***************************************************************************
CEntry::~CEntry()
{
sPath.Empty();
}
//***************************************************************************
//
// CHandleCache::~CHandleCache
//
// DESCRIPTION:
//
// Destructor.
//
//***************************************************************************
CHandleCache::~CHandleCache()
{
Delete(0);
}
//***************************************************************************
//
// CHandleCache::lAddToList
//
// DESCRIPTION:
//
// Adds an entry to the handle list.
//
//
// PARAMETERS:
//
// pAdd Name that will be used to retrieve the handle
// hAdd handle to be added
//
// RETURN VALUE:
//
// S_OK all is well.
// WBEM_E_OUT_OF_MEMORY out of memory
//
//***************************************************************************
long int CHandleCache::lAddToList(
IN const TCHAR * pAdd,
IN HANDLE hAdd)
{
CEntry * pNew = new CEntry();
if(pNew == NULL)
return WBEM_E_OUT_OF_MEMORY;
pNew->hHandle = hAdd;
pNew->sPath = pAdd;
if(CFlexArray::no_error != List.Add(pNew))
return WBEM_E_OUT_OF_MEMORY;
return S_OK;
}
//***************************************************************************
//
// CHandleCache::lGetNumMatch
//
// DESCRIPTION:
//
// Returns the number of entries which match the path tokens. For example,
// the path might be HKEY_LOCAL_MACHINE, hardware, description, xyz, and
// if the tokens, were, HKEY_LOCAL_MACHINE, hardware, devicemap, xyz then a
// two would be returned since the first two parts matched.
//
// PARAMETERS:
//
// iEntry Entry to start checking at
// iToken Token to start checking
// Path This object supplies the tokens to be checked.
//
// RETURN VALUE:
//
// see description.
//
//***************************************************************************
long int CHandleCache::lGetNumMatch(
IN int iEntry,
IN int iToken,
IN CProvObj & Path)
{
int iMatch = 0;
for(;iEntry < List.Size() && iToken < Path.iGetNumTokens();
iEntry++, iToken++, iMatch++)
{
CEntry * pCurr = (CEntry *)List.GetAt(iEntry);
TString sTemp = Path.sGetFullToken(iToken);
if(lstrcmpi(pCurr->sPath,sTemp))
break;
}
return iMatch;
}
//***************************************************************************
//
// CHandleCache::Delete
//
// DESCRIPTION:
//
// Empties all or part of the cache.
//
// PARAMETERS:
//
// lStart Indicates first element to delete. To empty entire cache,
// a zero should be entered.
//
//***************************************************************************
void CHandleCache::Delete(
IN long int lStart)
{
int iCurr;
for(iCurr = List.Size()-1; iCurr >= lStart; iCurr--)
{
CEntry * pCurr = (CEntry *)List.GetAt(iCurr);
delete pCurr;
List.RemoveAt(iCurr);
}
}
//***************************************************************************
//
// CHandleCache::hGetHandle
//
// DESCRIPTION:
//
// Gets a handle.
//
// PARAMETERS:
//
// lIndex Indicates which handle to get. 0 is the first.
//
// RETURN VALUE:
// handle retuested, NULL only if bad index is entered.
//
//***************************************************************************
HANDLE CHandleCache::hGetHandle(
IN long int lIndex)
{
if(lIndex < List.Size())
{
CEntry * pCurr = (CEntry *)List.GetAt(lIndex);
if(pCurr)
return pCurr->hHandle;
}
return NULL;
}
//***************************************************************************
//
// CHandleCache::sGetString
//
// DESCRIPTION:
//
// Gets the string associated with a cache entry.
//
// PARAMETERS:
//
// lIndex Index in cache, 0 is the first element.
//
// RETURN VALUE:
//
// Returns a pointer to the string. NULL if bad index.
//
//***************************************************************************
const TCHAR * CHandleCache::sGetString(
IN long int lIndex)
{
if(lIndex < List.Size()) {
CEntry * pCurr = (CEntry *)List.GetAt(lIndex);
if(pCurr)
return pCurr->sPath;
}
return NULL;
}
//***************************************************************************
//
// CToken::CToken
//
// DESCRIPTION:
//
// constructor.
//
// PARAMETERS:
//
// cpStart String to be parsed.
// cDelim Token delimeter.
// bUsesEscapes If true, then need to look for special characters
//
//***************************************************************************
#define MAX_TEMP 150
CToken::CToken(
IN const TCHAR * cpStart,
IN const OLECHAR cDelim,
bool bUsesEscapes)
{
const TCHAR * cpCurr; //atoi
iOriginalLength = -1;
TString *psExp;
int iNumQuote;
BOOL bLastWasEsc, bInExp, bInString;
bLastWasEsc = bInExp = bInString = FALSE;
// Before doing an elaborate parse, first check for the simple case where there
// are no quotes, escapes, commas, etc
bool bGotSpecialChar = false;
for(cpCurr = cpStart; *cpCurr && *cpCurr != cDelim; cpCurr++)
{
if(*cpCurr == ESC || *cpCurr == '\"' || *cpCurr == '(')
bGotSpecialChar = true;
}
if(!bUsesEscapes || cDelim != MAIN_DELIM || *cpCurr == cDelim || !bGotSpecialChar)
{
// Simple case do it quickly
iOriginalLength = cpCurr - cpStart;
if(iOriginalLength < MAX_TEMP)
{
TCHAR tcTemp[MAX_TEMP];
lstrcpyn(tcTemp, cpStart, iOriginalLength + 1);
sFullData = tcTemp;
sData = tcTemp;
if(*cpCurr)
iOriginalLength++;
return;
}
}
for(cpCurr = cpStart; *cpCurr; cpCurr++) {
// check if end of token
if(*cpCurr == cDelim && !bLastWasEsc) {
cpCurr++;
break;
}
// full data stores everything. Check if character
// is the escape which means that the following
// character should be interpreted as a literal
sFullData += *cpCurr;
if(*cpCurr == ESC && !bLastWasEsc) {
bLastWasEsc = TRUE;
continue;
}
// tokens can include indexs of the form
// (xxx) or ("xxx"). If an index is detected,
// then store the characters between () separately
if((*cpCurr == '(' && !bInExp && !bLastWasEsc)||
(*cpCurr == ',' && bInExp && !bLastWasEsc)) {
// start of index expression. Allocate a new
// string to store it and store the string
// in the expression collection.
psExp = new (TString);
if(psExp) {
Expressions.Add((CObject *)psExp);
bInExp = TRUE;
iNumQuote = 0;
}
}
else if(*cpCurr == ')' && bInExp && !bInString && !bLastWasEsc)
bInExp = FALSE; // end of index expression
else if (*cpCurr == '\"' && bInExp && !bLastWasEsc) {
iNumQuote++;
if(iNumQuote == 1) {
bInString = TRUE;
*psExp += *cpCurr;
}
else if(iNumQuote == 2)
bInString = FALSE;
else
return;
}
else if (bInExp)
*psExp += *cpCurr;
else
sData += *cpCurr;
bLastWasEsc = FALSE;
}
if(bInString || bInExp)
return; // got junk!!!
iOriginalLength = cpCurr - cpStart;
return;
}
//***************************************************************************
//
// CToken::~CToken
//
// DESCRIPTION:
//
// Destructor.
//
//***************************************************************************
CToken::~CToken()
{
int iCnt;
TString * pCurr;
for (iCnt = 0; iCnt < Expressions.Size(); iCnt++) {
pCurr = (TString *)Expressions.GetAt(iCnt);
delete pCurr;
}
Expressions.Empty();
sData.Empty();
sFullData.Empty();
}
//***************************************************************************
//
// CToken::iConvOprand
//
// DESCRIPTION:
//
// Converts the characters in a string into an integer.
//
// PARAMETERS:
//
// tpCurr String to be converted.
// iArray Not used anymore.
// dwValue where the result is set.
//
// RETURN VALUE:
//
// Number of digits converted.
//
//***************************************************************************
long int CToken::iConvOprand(
IN const TCHAR * tpCurr,
IN int iArray,
OUT long int & dwValue)
{
TString sTemp;
long int iRet = 0;
// Build up a string containing
// all characters upto the first non didgit
for(;*tpCurr; tpCurr++)
if(iswdigit(*tpCurr))
{
sTemp += *tpCurr;
iRet++;
}
else
break;
// Convert and return the length
dwValue = _ttoi(sTemp);
return iRet;
}
//***************************************************************************
//
// CToken::GetIntExp
//
// DESCRIPTION:
//
// Converts the expression into an integer. The expression
// can only be made up of integers, '+', '-' and a special
// character ('#' as of now)for substituting iArray. Examples,
// (23) (#+3) (#-4)
//
// PARAMETERS:
//
// iExp which integer to retrieve in the case where you have 2,5,8
// iArray Not used anymore
//
// RETURN VALUE:
//
// -1 if error.
//
//***************************************************************************
long int CToken::GetIntExp(int iExp,int iArray)
{
TString * psTest;
TString sNoBlanks;
TCHAR const * tpCurr;
long int lOpSize;
int iCnt;
long int lAccum = 0, lOperand;
TCHAR tUnary = ' ';
TCHAR tBinary = '+';
BOOL bNeedOperator = FALSE; // Start off needing operand
// Do some intial check such as making sure the expression
// exists and that it isnt a string expression
if(Expressions.Size() <= iExp)
return -1;
if(IsExpString(iExp))
return -1;
psTest = (TString *)Expressions.GetAt(iExp);
if(psTest == NULL) {
return -1;
}
// Get rid of any blanks
for(iCnt = 0; iCnt < psTest->Length(); iCnt++)
if(psTest->GetAt(iCnt) != ' ')
sNoBlanks += psTest->GetAt(iCnt);
// Evalate the expression
for(tpCurr = sNoBlanks; *tpCurr; tpCurr++)
{
if(*tpCurr == '+' || *tpCurr == '-')
{
// got an operator. Note that if an operator is not needed,
// such as before the first operand, then it must be a unary
// operator. Only one unary operator in a row is valid.
if(bNeedOperator)
{
tBinary = *tpCurr;
bNeedOperator = FALSE;
}
else
{
if(tUnary != ' ') // Gratuitous unary operator
return -1;
tUnary = *tpCurr;
}
}
else
{
// got an operand
if(bNeedOperator) // Gratuitous unary operand
return -1;
lOpSize = iConvOprand(tpCurr,iArray,lOperand);
if(lOpSize > 1)
tpCurr += lOpSize-1;
if(tUnary == '-')
lOperand = -lOperand;
if(tBinary == '+')
lAccum = lAccum + lOperand;
else
lAccum = lAccum - lOperand;
bNeedOperator = TRUE;
tUnary = ' ';
}
}
return lAccum;
}
//***************************************************************************
//
// CToken::GetStringExp
//
// DESCRIPTION:
//
// Returns a string expression.
//
// PARAMETERS:
//
// iExp Which string to use when they are separated by commans
//
// RETURN VALUE:
//
// Pointer to string, NULL if iExp is bogus.
//
//***************************************************************************
TCHAR const * CToken::GetStringExp(
IN int iExp)
{
TString * psTest;
TCHAR const * tp;
// start by making sure expression exists.
if(Expressions.Size() <= iExp)
return NULL;
psTest = (TString *)Expressions.GetAt(iExp);
if(psTest != NULL)
{
int iIndex;
iIndex = psTest->Find('\"');
if(iIndex != -1)
{
// All is well. Return a pointer one passed
// the initial \" whose only purpose is to
// indicate that this is a string expression.
tp = *psTest;
return tp + iIndex + 1;
}
}
return NULL;
}
//***************************************************************************
//
// CToken::IsExpString
//
// DESCRIPTION:
//
// Tests if the token contains a string
//
// PARAMETERS:
//
// iExp Indicates which substring for when the strings are divided
// by commas
//
// RETURN VALUE:
// Returns true if the expression is a string.
//
//***************************************************************************
BOOL CToken::IsExpString(int iExp)
{
TString * psTest;
// make sure that the expression exists.
if(Expressions.Size() <= iExp)
return FALSE;
psTest = (TString *)Expressions.GetAt(iExp);
if(psTest != NULL) {
int iIndex;
// String expressions always contain at least one \"
iIndex = psTest->Find('\"');
if(iIndex != -1)
return TRUE;
}
return FALSE;
}
//***************************************************************************
//
// CProvObj::CProvObj(const char * ProviderString,const TCHAR cDelim)
//
// DESCRIPTION:
//
// Constructor.
//
// PARAMETERS:
//
// ProviderString String passed from wbem
// cDelim Token delimeter
// bUsesEscapes True if we need to treat escapes in a special way.
//
//***************************************************************************
#ifndef UNICODE
CProvObj::CProvObj(
IN const char * ProviderString,
IN const TCHAR cDelim, bool bUsesEscapes)
{
m_bUsesEscapes = bUsesEscapes;
Init(ProviderString,cDelim);
return;
}
#endif
//***************************************************************************
//
// CProvObj::CProvObj(const WCHAR * ProviderString,const TCHAR cDelim)
//
// DESCRIPTION:
//
// Constructor.
//
// PARAMETERS:
//
// ProviderString String passed from wbem
// cDelim Token delimeter
//
//***************************************************************************
CProvObj::CProvObj(
IN const WCHAR * ProviderString,
IN const TCHAR cDelim, bool bUsesEscapes)
{
m_bUsesEscapes = bUsesEscapes;
#ifdef UNICODE
Init(ProviderString,cDelim);
#else
char * pTemp = WideToNarrowA(ProviderString);
if(pTemp == NULL)
dwStatus = WBEM_E_FAILED;
else {
Init(pTemp,cDelim);
delete pTemp;
}
#endif
return;
}
//***************************************************************************
//
// void CProvObj::Init
//
// DESCRIPTION:
//
// Doest the acutal work for the various constructors.
//
// PARAMETERS:
// ProviderString String passed from wbem
// cDelim Token delimeter
//
//***************************************************************************
void CProvObj::Init(
IN const TCHAR * ProviderString,
IN const TCHAR cDelim)
{
CToken * pNewToken;
const TCHAR * cpCurr;
m_cDelim = cDelim;
// Create a list of tokens
for(cpCurr = ProviderString; *cpCurr;cpCurr+=pNewToken->GetOrigLength())
{
int iRet = 0;
pNewToken = new CToken(cpCurr,cDelim, m_bUsesEscapes);
if(pNewToken)
iRet = myTokens.Add(pNewToken);
if(pNewToken == NULL || iRet != CFlexArray::no_error)
{
dwStatus = WBEM_E_OUT_OF_MEMORY;
return;
}
if(pNewToken->GetOrigLength() == -1)
{
dwStatus = WBEM_E_INVALID_PARAMETER;
return;
}
}
dwStatus = WBEM_NO_ERROR;
return;
}
//***************************************************************************
//
// CProvObj::Empty
//
// DESCRIPTION:
//
// frees up all the data
//
//***************************************************************************
void CProvObj::Empty(void)
{
int iCnt;
CToken * pCurr;
for (iCnt = 0; iCnt < myTokens.Size(); iCnt++) {
pCurr = (CToken *)myTokens.GetAt(iCnt);
delete pCurr;
}
myTokens.Empty();
}
//***************************************************************************
//
// BOOL CProvObj::Update
//
// DESCRIPTION:
//
// Resets the value with a new provider string.
//
// PARAMETERS:
//
// pwcProvider New provider string
//
// RETURN VALUE:
//
// TRUE if ok.
//***************************************************************************
BOOL CProvObj::Update(
IN WCHAR * pwcProvider)
{
// Do a quick check to see if the "fast" update can be used
BOOL bComplex = FALSE;
int iDelim = 0;
WCHAR * pwcCurr;
for(pwcCurr = pwcProvider; *pwcCurr; pwcCurr++)
{
if(*pwcCurr == m_cDelim)
iDelim++;
else if(*pwcCurr == ESC || *pwcCurr == L'\"' || *pwcCurr == L'(')
{
bComplex = TRUE;
break;
}
}
// If the number of tokens changed, or there is some embedded junk
// just empty and retry.
if(bComplex || iDelim != myTokens.Size()-1)
{
Empty();
#ifdef UNICODE
Init(pwcProvider,m_cDelim);
#else
char * pTemp = WideToNarrowA(pwcProvider);
if(pTemp == NULL)
return FALSE;
Init(pTemp,m_cDelim);
delete pTemp;
#endif
return TRUE;
}
// We can take the shortcut. Start by creating a TCHAR temp version
int iLen = 2*wcslen(pwcProvider) + 1;
TCHAR * pTemp = new TCHAR[iLen];
if(pTemp == NULL)
return FALSE;
#ifdef UNICODE
wcscpy(pTemp,pwcProvider);
#else
wcstombs(pTemp, pwcProvider, iLen);
#endif
TCHAR * ptcCurr;
TCHAR * pStart;
BOOL bTheEnd = FALSE;
iDelim = 0;
for(pStart = ptcCurr = pTemp;!bTheEnd;ptcCurr++)
{
if(*ptcCurr == m_cDelim || *ptcCurr == NULL)
{
bTheEnd = (*ptcCurr == NULL);
*ptcCurr = NULL;
CToken * pToken = (CToken *)myTokens.GetAt(iDelim);
if(pToken && lstrcmpi(pStart,pToken->sFullData))
{
pToken->sFullData = pStart;
pToken->sData = pStart;
}
iDelim++;
pStart = ptcCurr+1;
}
}
delete pTemp;
return TRUE;
}
//***************************************************************************
//
// CProvObj::GetTokenPointer
//
// DESCRIPTION:
//
// Gets a pointer to a token
//
// PARAMETERS:
//
// iToken Which token to get
//
// RETURN VALUE:
//
// pointer to token, or NULL if bad request.
//
//***************************************************************************
CToken * CProvObj::GetTokenPointer(
IN int iToken)
{
if(iToken >= myTokens.Size() || iToken < 0)
return NULL;
return (CToken *)myTokens.GetAt(iToken);
}
//***************************************************************************
//
// CProvObj::dwGetStatus
//
// DESCRIPTION:
//
// Gets status and also checks to make sure a minimum number of tokens
// exist.
//
// PARAMETERS:
//
// iMin minimum number of tokens.
//
// RETURN VALUE:
//
// Returns S_OK if OK, WBEM_E_FAILED otherwise.
//
//***************************************************************************
DWORD CProvObj::dwGetStatus(
IN int iMin)
{
if(dwStatus)
return dwStatus;
else
return (iMin <= myTokens.Size()) ? S_OK : WBEM_E_FAILED;
}
//***************************************************************************
//
// CProvObj::sGetToken
//
// DESCRIPTION:
//
// Gets a token. Note that the token will not include embleded "(stuff)"
//
// PARAMETERS:
//
// iToken which token to get
//
// RETURN VALUE:
//
// pointer to token, NULL if invalid argument
//***************************************************************************
const TCHAR * CProvObj::sGetToken(
IN int iToken)
{
CToken * pCurr = GetTokenPointer(iToken);
return (pCurr) ? pCurr->GetStringValue() : NULL;
}
//***************************************************************************
//
// const TCHAR * CProvObj::sGetFullToken
//
// DESCRIPTION:
//
// Gets a full and unadulterated token.
//
// PARAMETERS:
//
// iToken token to get
//
// RETURN VALUE:
//
// pointer to token, NULL if invalid argument
//***************************************************************************
const TCHAR * CProvObj::sGetFullToken(
IN int iToken)
{
CToken * pCurr = GetTokenPointer(iToken);
return (pCurr) ? pCurr->GetFullStringValue() : NULL;
}
//***************************************************************************
//
// const TCHAR * CProvObj::sGetStringExp
//
// DESCRIPTION:
//
// Gets a substring for a particular token
//
// PARAMETERS:
//
// iToken token to get
// iExp substring to get
//
// RETURN VALUE:
//
// pointer to substring, NULL if invalid argument
//***************************************************************************
const TCHAR * CProvObj::sGetStringExp(
IN int iToken,
IN int iExp)
{
CToken * pCurr = GetTokenPointer(iToken);
return (pCurr) ? pCurr->GetStringExp(iExp) : NULL;
}
//***************************************************************************
//
// long int CProvObj::iGetIntExp
//
// DESCRIPTION:
//
// For a particular token, gets the integer value of a substring.
//
// PARAMETERS:
//
// iToken token to get
// iExp substring
// iArray no longer used
//
// RETURN VALUE:
//
// int value, or -1 if bad argument
//***************************************************************************
long int CProvObj::iGetIntExp(
IN int iToken,
IN int iExp,
IN int iArray)
{
CToken * pCurr = GetTokenPointer(iToken);
return (pCurr) ? pCurr->GetIntExp(iExp,iArray) : -1;
}
//***************************************************************************
//
// BOOL CProvObj::IsExpString
//
// DESCRIPTION:
//
// Tests a substring to see if it is a string, or numeric
//
// PARAMETERS:
//
// iToken token to get
// iExp substring
//
//
// RETURN VALUE:
//
// True if arguments are valid and it is not numeric
//***************************************************************************
BOOL CProvObj::IsExpString(
IN int iToken,
IN int iExp)
{
CToken * pCurr = GetTokenPointer(iToken);
return (pCurr) ? pCurr->IsExpString(iExp) : FALSE;
}
//***************************************************************************
//
// long int CProvObj::iGetNumExp
//
// DESCRIPTION:
//
// Gets the number of subexpressions
//
// PARAMETERS:
//
// iToken token to check
//
// RETURN VALUE:
//
// number of substrings (subexpressions) or -1 if invalid argument
//***************************************************************************
long int CProvObj::iGetNumExp(
IN int iToken)
{
CToken * pCurr = GetTokenPointer(iToken);
return (pCurr) ? pCurr->GetNumExp() : -1;
}
//***************************************************************************
//
// IWbemClassObject * GetNotifyObj
//
// DESCRIPTION:
//
// This utility is useful for setting notify objects
// at the end of async calls.
//
// PARAMETERS:
//
// pServices pointer back into WBEM
// lRet status code to set in notify object
//
// RETURN VALUE:
//
// Class object. Null if failure.
//***************************************************************************
IWbemClassObject * GetNotifyObj(
IN IWbemServices * pServices,
IN long lRet,
IN IWbemContext *pCtx)
{
if(pServices == NULL)
return NULL;
IWbemClassObject * pInst = NULL;
IWbemClassObject * pClass = NULL;
SCODE sc = pServices->GetObject(L"__ExtendedStatus", 0, pCtx, &pClass, NULL);
if(sc != S_OK)
return NULL;
sc = pClass->SpawnInstance(0, &pInst);
pClass->Release();
if(sc == S_OK && pInst)
{
VARIANT v;
v.vt = VT_I4;
v.lVal = lRet;
sc = pInst->Put(L"StatusCode", 0, &v, 0);
if(sc != S_OK)
{
pInst->Release();
return NULL;
}
else
return pInst;
}
return NULL;
}
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