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WindowsXP-SP1/base/wmi/bmof/bmof.c

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First commit
2001-01-01 00:00:00 +01:00
//***************************************************************************
//
// Copyright (c) 1997 by Microsoft Corporation
//
// bmof.c
//
// a-davj 14-April-97 Created.
//
// Structures and helper functions for naviagating a BMOF file.
//
//***************************************************************************
#include "wmiump.h"
#include <string.h>
#include <ole2.h>
#include <oleauto.h>
#include "bmof.h"
#define VT_EMBEDDED_OBJECT VT_UNKNOWN
//***************************************************************************
//
// BOOL LookupFlavor
//
// DESCRIPTION:
//
// Looks in the flavor table to see if a qualifier has a flavor.
//
// PARAMETERS:
//
// pQual Pointer to the qualifier.
// pdwFlavor Pointer to where the return value is put
// pBuff Pointer to the main buffer. I.e. "BMOF...."
//
//
// RETURN VALUE:
//
// TRUE if there is a flavor. Note that failure is normal
//
//***************************************************************************
BOOL LookupFlavor(BYTE * pQual, DWORD * pdwFlavor, BYTE * pBuff)
{
DWORD * pTemp;
BYTE * pFlavorBlob;
DWORD dwNumPairs;
DWORD * pOffset;
DWORD * pFlavor;
DWORD dwMyOffset;
DWORD dwCnt;
*pdwFlavor = 0;
// Calculate the pointer of the start of the flavor data
pTemp = (DWORD * )pBuff;
pTemp++; // point to the original blob size
pFlavorBlob = pBuff + *pTemp;
// Check if the flavor blob is valid, it should start off with the
// characters "BMOFQUALFLAVOR11"
if(memcmp(pFlavorBlob, "BMOFQUALFLAVOR11", 16))
return FALSE; // Not really a problem since it may be old file
// The flavor part of the file has the format
// DWORD dwNumPair, followed by pairs of dwords;
// offset, flavor
// Determine the number of pairs
pFlavorBlob+= 16;
pTemp = (DWORD *)pFlavorBlob;
dwNumPairs = *pTemp; // Number of offset/value pairs
if(dwNumPairs < 1)
return FALSE;
// point to the first offset/flavor pair
pOffset = pTemp+1;
pFlavor = pOffset+1;
// Determine the offset we are looking for. That is the pointer to the qualifier minus
// the pointer to the start of the block;
dwMyOffset = (DWORD)(pQual - pBuff);
for(dwCnt = 0; dwCnt < dwNumPairs; dwCnt++)
{
if(dwMyOffset == *pOffset)
{
*pdwFlavor = *pFlavor;
}
if(dwMyOffset < *pOffset)
return FALSE;
pOffset += 2;
pFlavor += 2;
}
return FALSE;
}
//***************************************************************************
//
// int ITypeSize
//
// DESCRIPTION:
//
// Gets the number of bytes acutally used to store
// a variant type. 0 if the type is unknown
//
// PARAMETERS:
//
// vtTest Type in question.
//
//
// RETURN VALUE:
//
// see description
//
//***************************************************************************
int iTypeSize(
IN DWORD vtTest)
{
int iRet;
vtTest &= ~ VT_ARRAY; // get rid of possible array bit
vtTest &= ~ VT_BYREF; // get rid of possible byref bit
switch (vtTest) {
case VT_UI1:
case VT_LPSTR:
iRet = 1;
break;
case VT_LPWSTR:
case VT_BSTR:
case VT_I2:
iRet = 2;
break;
case VT_I4:
case VT_R4:
iRet = 4;
break;
case VT_R8:
iRet = 8;
break;
case VT_BOOL:
iRet = sizeof(VARIANT_BOOL);
break;
case VT_ERROR:
iRet = sizeof(SCODE);
break;
case VT_CY:
iRet = sizeof(CY);
break;
case VT_DATE:
iRet = sizeof(DATE);
break;
default:
iRet = 0;
}
return iRet;
}
//***************************************************************************
//
// CBMOFQualList * CreateQualList
//
// DESCRIPTION:
//
// Create a CBMOFQualList object which serves as a wrapper.
//
// PARAMETERS:
//
// pwql pointer to the WBEM_Qualifier structure in the binary
// MOF.
//
// RETURN VALUE:
//
// Pointer to CBMOFQualList structure that servers as a wrapper. NULL
// if error. This must be freed via BMOFFree() when no longer needed.
//
//
//***************************************************************************
CBMOFQualList * CreateQualList(WBEM_QualifierList *pwql)
{
CBMOFQualList * pRet = NULL;
if(pwql == NULL)
return NULL;
pRet = (CBMOFQualList *)BMOFAlloc(sizeof (CBMOFQualList));
if(pRet != NULL)
{
pRet->m_pql = pwql;
pRet->m_pInfo = (WBEM_Qualifier *)
((BYTE *)pRet->m_pql + sizeof(WBEM_QualifierList));;
ResetQualList(pRet);
}
return pRet;
}
//***************************************************************************
//
// void ResetQualList
//
// DESCRIPTION:
//
// Resets CBMOFQualList stucture to point to the first entry.
//
// PARAMETERS:
//
// pql structure to be reset
//
//***************************************************************************
void ResetQualList(CBMOFQualList * pql)
{
if(pql)
{
pql->m_CurrQual = 0;
pql->m_pCurr = pql->m_pInfo;
}
}
//***************************************************************************
//
// BOOL NextQual
//
// DESCRIPTION:
//
// Gets the name and value of the next qualifier in the list.
//
// PARAMETERS:
//
// pql Input, points to CBMOFQualList object with data
// ppName Output, if functions succeeds, this points to a
// WCHAR string that the caller must free. May be
// NULL if caller doesnt want name.
// pItem Input/Output, if set, points to a data item structure
// which will be updated to point to the qualifier data.
//
// RETURN VALUE:
//
// TRUE if OK.
//
//
//***************************************************************************
BOOL NextQual(CBMOFQualList * pql,WCHAR ** ppName, CBMOFDataItem * pItem)
{
return NextQualEx(pql, ppName, pItem, NULL, NULL);
}
//***************************************************************************
//
// BOOL NextQualEx
//
// DESCRIPTION:
//
// Gets the name and value of the next qualifier in the list.
//
// PARAMETERS:
//
// pql Input, points to CBMOFQualList object with data
// ppName Output, if functions succeeds, this points to a
// WCHAR string that the caller must free. May be
// NULL if caller doesnt want name.
// pItem Input/Output, if set, points to a data item structure
// which will be updated to point to the qualifier data.
// pdwFlavor optional, pointer to where the flavor value is to be copied
// if not null, then pBuff must be set!
// pBuff Pointer to the starting byte of the whole blob. Same as
// whats copied to CreateObjList.
//
// RETURN VALUE:
//
// TRUE if OK.
//
//
//***************************************************************************
BOOL NextQualEx(CBMOFQualList * pql,WCHAR ** ppName, CBMOFDataItem * pItem,
DWORD * pdwFlavor, BYTE * pBuff)
{
BYTE * pInfo;
BOOL bRet = TRUE;
if(pql == NULL || pql->m_CurrQual++ >= pql->m_pql->dwNumQualifiers)
return FALSE;
if(pdwFlavor && pBuff)
LookupFlavor((BYTE *)pql->m_pCurr, pdwFlavor, pBuff);
pInfo = (BYTE *)pql->m_pCurr + sizeof(WBEM_Qualifier);
if (ppName)
{
SetName(ppName, pInfo, pql->m_pCurr->dwOffsetName);
if (*ppName == NULL)
{
return(FALSE);
}
}
if(pInfo)
bRet = SetValue(pItem, pInfo, pql->m_pCurr->dwOffsetValue,
pql->m_pCurr->dwType);
// advance to next
pql->m_pCurr = (WBEM_Qualifier *)((BYTE *)pql->m_pCurr + pql->m_pCurr->dwLength);
return bRet;
}
//***************************************************************************
//
// BOOL FindQual
//
// DESCRIPTION:
//
// Searches for a qualifier with a given name. The search is case
// insensitive
//
// PARAMETERS:
//
// pql Input, pointer to qualifier list
// pName Input, Name to be searched for.
// pItem Input/Output, if successful set to point to the data.
//
// RETURN VALUE:
//
// True if OK.
//
//***************************************************************************
BOOL FindQual(CBMOFQualList * pql,WCHAR * pName, CBMOFDataItem * pItem)
{
return FindQualEx(pql, pName, pItem, NULL, NULL);
}
//***************************************************************************
//
// BOOL FindQualEx
//
// DESCRIPTION:
//
// Searches for a qualifier with a given name. The search is case
// insensitive
//
// PARAMETERS:
//
// pql Input, pointer to qualifier list
// pName Input, Name to be searched for.
// pItem Input/Output, if successful set to point to the data.
// pdwFlavor optional, pointer to where the flavor value is to be copied
// if not null, then pBuff must be set!
// pBuff Pointer to the starting byte of the whole blob. Same as
// whats copied to CreateObjList.
//
// RETURN VALUE:
//
// True if OK.
//
//***************************************************************************
BOOL FindQualEx(CBMOFQualList * pql,WCHAR * pName, CBMOFDataItem * pItem,
DWORD * pdwFlavor, BYTE * pBuff)
{
DWORD dwCnt;
WBEM_Qualifier * pQual = pql->m_pInfo;
for(dwCnt = 0; dwCnt < pql->m_pql->dwNumQualifiers; dwCnt++)
{
WCHAR * pTest;
BOOL bMatch;
BYTE * pInfo = (BYTE *)pQual + sizeof(WBEM_Qualifier);
if(!SetName(&pTest, pInfo, pQual->dwOffsetName))
return FALSE;
bMatch = !_wcsicmp(pTest, pName);
BMOFFree(pTest);
if(bMatch)
{
if(pdwFlavor && pBuff)
LookupFlavor((BYTE *)pQual, pdwFlavor, pBuff);
return SetValue(pItem, pInfo, pQual->dwOffsetValue, pQual->dwType);
}
pQual = (WBEM_Qualifier *)((BYTE *)pQual + pQual->dwLength);
}
return FALSE;
}
//***************************************************************************
//
// BOOL SetValue
//
// DESCRIPTION:
//
// Sets up a CBMOFDataItem structure to point to a value in the BMOF.
//
// PARAMETERS:
//
// pItem Input/Output, item to be set
// pInfo Input, start of information block
// dwOffset Input, offset to actual data.
// dwType Input data type.
//
// RETURN VALUE:
//
// TRUE if OK.
//
//***************************************************************************
BOOL SetValue(CBMOFDataItem * pItem, BYTE * pInfo, DWORD dwOffset, DWORD dwType)
{
if(pItem == NULL || pInfo == NULL)
return FALSE;
pItem->m_dwType = dwType;
// Check for NULL case. This is how uninitialized data is stored.
if(dwOffset == 0xffffffff)
pItem->m_pData = NULL;
else
pItem->m_pData = pInfo + dwOffset;
return TRUE;
}
//***************************************************************************
//
// BOOL SetName
//
// DESCRIPTION:
//
// Gets a name out of an information block.
//
// PARAMETERS:
//
// ppName Input/Output. On successful return, will point to a
// WCHAR string containing the name. This MUST be freed
// by the caller via BMOFFree()!
// pInfo Input, start of information block
// dwOffset Input, offset to actual data.
//
// RETURN VALUE:
//
// TRUE if OK.
//***************************************************************************
BOOL SetName(WCHAR ** ppName, BYTE * pInfo, DWORD dwOffset)
{
WCHAR * pName;
if(ppName == NULL || pInfo == NULL || dwOffset == 0xffffffff)
return FALSE;
pName = (WCHAR *)(pInfo + dwOffset); // point to string in info block
*ppName = (WCHAR *)BMOFAlloc(2*(wcslen(pName) + 1));
if(*ppName == NULL)
return FALSE;
wcscpy(*ppName, pName);
return TRUE;
}
//***************************************************************************
//
// CBMOFObj * CreateObj
//
// DESCRIPTION:
//
// Create a CBMOFObj structure which wraps a WBEM_Object
//
// PARAMETERS:
//
// pwob Input, structure to be wrapped
//
// RETURN VALUE:
//
// pointer to wrapper structure. NULL if error. This must be freed via
// BMOFFree() when no longer needed.
//
//***************************************************************************
CBMOFObj * CreateObj(WBEM_Object * pwob)
{
CBMOFObj * pRet = (CBMOFObj *)BMOFAlloc(sizeof(CBMOFObj));
if(pRet)
{
pRet->m_pob = pwob;
pRet->m_pInfo = ((BYTE *)pwob) + sizeof(WBEM_Object);
pRet->m_ppl = (WBEM_PropertyList*)(pRet->m_pInfo +
pwob->dwOffsetPropertyList);
pRet->m_pml = (WBEM_PropertyList*)(pRet->m_pInfo +
pwob->dwOffsetMethodList);
ResetObj(pRet);
}
return pRet;
}
//***************************************************************************
//
// void ResetObj
//
// DESCRIPTION:
//
// Resets a CBMOFObj structure so that it points to its first property.
//
// PARAMETERS:
//
// pob Input/Output, stucture to be reset.
//
//***************************************************************************
void ResetObj(CBMOFObj * pob)
{
if(pob)
{
pob->m_CurrProp = 0;
pob->m_pCurrProp = (WBEM_Property *) ((BYTE *)pob->m_ppl +
sizeof(WBEM_PropertyList));
pob->m_CurrMeth = 0;
pob->m_pCurrMeth = (WBEM_Property *) ((BYTE *)pob->m_pml +
sizeof(WBEM_PropertyList));
}
}
//***************************************************************************
//
// CBMOFQualList * GetQualList
//
// DESCRIPTION:
//
// Returns a CBMOFQualList structure which wraps the objects qualifier list.
//
// PARAMETERS:
//
// pob Input. Structure which wraps the object.
//
// RETURN VALUE:
//
// Pointer to CBMOFQualList stucture. NULL if error. Note that this must
// be freed by the caller via BMOFFree()
//
//***************************************************************************
CBMOFQualList * GetQualList(CBMOFObj * pob)
{
WBEM_QualifierList *pql;
if(pob->m_pob->dwOffsetQualifierList == 0xffffffff)
return NULL;
pql = (WBEM_QualifierList *)((BYTE *)pob->m_pInfo+
pob->m_pob->dwOffsetQualifierList);
return CreateQualList(pql);
}
//***************************************************************************
//
// CBMOFQualList * GetPropQualList
// CBMOFQualList * GetMethQualList
//
// DESCRIPTION:
//
// Returns a CBMOFQualList structure which wraps a property or
// methods qualifier list.
//
// PARAMETERS:
//
// pob Input. Structure which wraps the object.
// pName Input. Property name. Note that this is case
// insensitive.
//
// RETURN VALUE:
//
// Pointer to CBMOFQualList stucture. NULL if error. Note that this must
// be freed by the caller via BMOFFree()
//
//***************************************************************************
CBMOFQualList * GetPropOrMethQualList(WBEM_Property * pProp)
{
if(pProp == NULL)
return NULL;
if(pProp->dwOffsetQualifierSet == 0xffffffff)
return NULL;
return CreateQualList((WBEM_QualifierList *)(
(BYTE *)pProp + sizeof(WBEM_Property)+
pProp->dwOffsetQualifierSet));
}
CBMOFQualList * GetPropQualList(CBMOFObj * pob, WCHAR * pName)
{
WBEM_Property * pProp = FindPropPtr(pob, pName);
return GetPropOrMethQualList(pProp);
}
CBMOFQualList * GetMethQualList(CBMOFObj * pob, WCHAR * pName)
{
WBEM_Property * pProp = FindMethPtr(pob, pName);
return GetPropOrMethQualList(pProp);
}
//***************************************************************************
//
// BOOL NextProp
// BOOL NextMet
//
// DESCRIPTION:
//
//
// PARAMETERS:
//
// pob Input. Structure which wraps the object.
// ppName Output, if functions succeeds, this points to a
// WCHAR string that the caller must free. May be
// NULL if caller doesnt want name.
// pItem Input/Output, if set, points to a data item structure
// which will be updated to point to the qualifier data.
///
// RETURN VALUE:
//
// TRUE if OK.
//***************************************************************************
BOOL Info(WBEM_Property * pPropOrMeth, WCHAR ** ppName, CBMOFDataItem * pItem)
{
BYTE * pInfo;
BOOL bRet = TRUE;
if(pPropOrMeth == NULL)
return FALSE;
pInfo = (BYTE *)pPropOrMeth + sizeof(WBEM_Property);
if(ppName)
bRet = SetName(ppName, pInfo, pPropOrMeth->dwOffsetName);
if (bRet && (pItem))
bRet = SetValue(pItem, pInfo,
pPropOrMeth->dwOffsetValue,
pPropOrMeth->dwType);
return bRet;
}
BOOL NextProp(CBMOFObj * pob, WCHAR ** ppName, CBMOFDataItem * pItem)
{
BOOL bRet = TRUE;
if(pob == FALSE || pob->m_CurrProp++ >= pob->m_ppl->dwNumberOfProperties)
return FALSE;
bRet = Info(pob->m_pCurrProp, ppName, pItem);
// advance pointer to next property.
pob->m_pCurrProp = (WBEM_Property *)
((BYTE *)pob->m_pCurrProp + pob->m_pCurrProp->dwLength);
return bRet;
}
BOOL NextMeth(CBMOFObj * pob, WCHAR ** ppName, CBMOFDataItem * pItem)
{
BOOL bRet = TRUE;
if(pob == FALSE || pob->m_CurrMeth++ >= pob->m_pml->dwNumberOfProperties)
return FALSE;
bRet = Info(pob->m_pCurrMeth, ppName, pItem);
// advance pointer to next method.
pob->m_pCurrMeth = (WBEM_Property *)
((BYTE *)pob->m_pCurrMeth + pob->m_pCurrMeth->dwLength);
return bRet;
}
//***************************************************************************
//
// BOOL FindProp
// BOOL FindMeth
//
// DESCRIPTION:
//
// Sets a CBMOFDataItem structure to point to a properties data.
//
// PARAMETERS:
//
// pob Input. Structure which wraps the object.
// pName Input. Name to be use for case insensitve search.
// pItem Input/Output. Data item stucture to be updated.
//
// RETURN VALUE:
//
// True if found.
//
//***************************************************************************
BOOL FindProp(CBMOFObj * pob, WCHAR * pName, CBMOFDataItem * pItem)
{
WBEM_Property * pProp = FindPropPtr(pob, pName);
return Info(pProp, NULL, pItem);
}
BOOL FindMeth(CBMOFObj * pob, WCHAR * pName, CBMOFDataItem * pItem)
{
WBEM_Property * pProp = FindMethPtr(pob, pName);
return Info(pProp, NULL, pItem);
}
//***************************************************************************
//
// BOOL GetName
//
// DESCRIPTION:
//
// Gets the name of an object. This is works be returning the "__Class"
// property.
//
// PARAMETERS:
//
// pob Input. Structure which wraps the object.
// ppName Input/Output. Points to a WCHAR string which
// has the name. The caller MUST free this via
// BMOFFree()
//
// RETURN VALUE:
//
// TRUE if OK.
//
//***************************************************************************
BOOL GetName(CBMOFObj * pob, WCHAR ** ppName)
{
CBMOFDataItem Item;
BOOL bRet = FALSE, bFound;
if(pob == NULL || ppName == NULL)
return FALSE;
bFound = FindProp(pob, L"__Class", &Item);
if(!bFound)
return FALSE;
if(Item.m_dwType == VT_BSTR && ppName)
{
bRet = GetData(&Item, (BYTE *)ppName, NULL);
}
return bRet;
}
//***************************************************************************
//
// DWORD GetType
//
// DESCRIPTION:
//
// Returns an objects type. A 0 indicates a class while a 1 indicates an
// instance. A 0xffffffff if passed a null pointer.
//
// PARAMETERS:
//
// pob Input. Structure which wraps the object.
//
//
// RETURN VALUE:
//
// See description.
//
//***************************************************************************
DWORD GetType(CBMOFObj * pob)
{
if(pob)
return pob->m_pob->dwType;
else
return 0xFFFFFFFF;
}
//***************************************************************************
//
// WBEM_Property * FindPropPtr
// WBEM_Property * FindMethPtr
//
// DESCRIPTION:
//
// Returns a WBEM_Property stucture pointer for a particular property or
// method given its name.
//
// PARAMETERS:
//
// pob Input. Structure which wraps the object.
// pName Input. Name of property. Comparison is case
// insensitive.
//
// RETURN VALUE:
//
// pointer to WBEM_Property, NULL if it cant be found.
//
//***************************************************************************
WBEM_Property * Search(BYTE * pList, DWORD dwListSize, WCHAR * pName)
{
DWORD dwCnt;
WBEM_Property * pProp = NULL;
// point to first property structure
pProp = (WBEM_Property *)(pList + sizeof(WBEM_PropertyList));
for(dwCnt = 0; dwCnt < dwListSize; dwCnt++)
{
WCHAR * pTest;
BOOL bMatch;
// point to the property's name and retrieve it
BYTE * pInfo = (BYTE *)pProp + sizeof(WBEM_Property);
if(!SetName(&pTest, pInfo, pProp->dwOffsetName))
return NULL;
bMatch = !_wcsicmp(pTest, pName);
BMOFFree(pTest);
// If we have a match, return
if(bMatch)
return pProp;
pProp = (WBEM_Property *)((BYTE *)pProp + pProp->dwLength);
}
return NULL;
}
WBEM_Property * FindPropPtr(CBMOFObj * pob, WCHAR * pName)
{
if(pob == NULL || pName == NULL)
return NULL;
// point to first property structure
return Search((BYTE *)pob->m_ppl, pob->m_ppl->dwNumberOfProperties, pName);
}
WBEM_Property * FindMethPtr(CBMOFObj * pob, WCHAR * pName)
{
if(pob == NULL || pName == NULL)
return NULL;
// point to first property structure
return Search((BYTE *)pob->m_pml, pob->m_pml->dwNumberOfProperties, pName);
}
//***************************************************************************
//
// CBMOFObjList * CreateObjList
//
// DESCRIPTION:
//
// Create a CBMOFObjList structure which wraps a BMOF file.
//
// PARAMETERS:
//
// pBuff Input, points to start of BMOF file.
//
// RETURN VALUE:
//
// pointer to wrapper structure. NULL if error. This must be freed via
// BMOFFree() when no longer needed.
//
//***************************************************************************
CBMOFObjList * CreateObjList(BYTE * pBuff)
{
CBMOFObjList * pRet = (CBMOFObjList * )BMOFAlloc(sizeof(CBMOFObjList));
if(pRet)
{
pRet->m_pol = (WBEM_Binary_MOF *)pBuff;
pRet->m_pInfo = (WBEM_Object *)
((BYTE *)pBuff + sizeof(WBEM_Binary_MOF));
ResetObjList(pRet);
}
return pRet;
}
//***************************************************************************
//
// void ResetObjList
//
// DESCRIPTION:
//
// Resets a CBMOFObjList structure so that it points to its first object.
//
// PARAMETERS:
//
// pol Input/Output, stucture to be reset.
//
//***************************************************************************
void ResetObjList(CBMOFObjList * pol)
{
if(pol)
{
pol->m_pCurrObj = pol->m_pInfo;
pol->m_CurrObj = 0;
}
}
//***************************************************************************
//
// CBMOFObj * NextObj
//
// DESCRIPTION:
//
// Gets the next object in the list.
//
// PARAMETERS:
//
// pol Input. Pointer to CBMOFObjList object
//
// RETURN VALUE:
//
// Pointer to a CBMOFObj stucture which can be use to access the object
// information. NULL if error. Note that the caller MUST Free this via
// BMOFFree().
//
//***************************************************************************
CBMOFObj * NextObj(CBMOFObjList *pol)
{
CBMOFObj * pRet;
if(pol == NULL || pol->m_CurrObj++ >= pol->m_pol->dwNumberOfObjects)
return NULL;
pRet = CreateObj(pol->m_pCurrObj);
pol->m_pCurrObj = (WBEM_Object *)((BYTE *)pol->m_pCurrObj + pol->m_pCurrObj->dwLength);
return pRet;
}
//***************************************************************************
//
// CBMOFObj * FindObj
//
// DESCRIPTION:
//
// Searches the object list for the first object which has a "__className"
// property. The search is case insensitive.
//
// PARAMETERS:
//
// pol Input. Pointer to CBMOFObjList object
// pName Input. Name of object being searched for
//
// RETURN VALUE:
//
// Pointer to a CBMOFObj stucture which can be use to access the object
// information. NULL if error. Note that the caller MUST Free this via
// BMOFFree().
//
//***************************************************************************
CBMOFObj * FindObj(CBMOFObjList *pol, WCHAR * pName)
{
DWORD dwCnt;
WBEM_Object * pob;
if(pol->m_pol == NULL || pName == NULL)
return NULL;
pob = pol->m_pInfo;
for(dwCnt = 0; dwCnt < pol->m_pol->dwNumberOfObjects; dwCnt)
{
WCHAR * pwcName = NULL;
BOOL bMatch = FALSE;
CBMOFObj * pRet = CreateObj(pob);
if(pRet == NULL)
return NULL;
if(GetName(pRet,&pwcName))
bMatch = TRUE;
if(pwcName)
BMOFFree(pwcName);
// If we found it, return it, otherwise free object and advance
if(bMatch)
return pRet;
BMOFFree(pRet);
pob = (WBEM_Object *)((BYTE *)pob + pob->dwLength);
}
return NULL;
}
//***************************************************************************
//
// int GetNumDimensions
//
// DESCRIPTION:
//
// Returns the number of dimensions for a data item.
//
// PARAMETERS:
//
// pItem Input. Item in question.
//
// RETURN VALUE:
// -1 if bogus argument, or if the data item doesnt hold data which would
// be the case for uninitialized properties.
// 0 if non array argument
// n Number of dimensions. Currently only single dimension arrays are
// supported.
//
//***************************************************************************
int GetNumDimensions(CBMOFDataItem * pItem)
{
unsigned long * pdwTemp;
if(pItem == NULL)
return -1;
if(!(pItem->m_dwType & VT_ARRAY))
return 0;
if(pItem->m_pData == NULL)
return -1;
pdwTemp = (unsigned long *)pItem->m_pData;
pdwTemp++; // skip past total size
return *pdwTemp;
}
//***************************************************************************
//
// int GetNumElements
//
// DESCRIPTION:
//
// Gets the number of elements for an array dimension. Note that 1 is the
// first dimenstion. Currently, only scalars and 1 dimensional arrays are
// supported.
//
// PARAMETERS:
//
// pItem Input. Data item in question.
// lDim Input. Dimension in question. The most significent
// (and for now only) dimension is 0.
//
// RETURN VALUE:
//
// Number of array elements. Note that scalars will return -1.
//
//***************************************************************************
int GetNumElements(CBMOFDataItem * pItem, long lDim)
{
int iCnt; DWORD * pdwTemp;
int lNumDim = GetNumDimensions(pItem);
if(lNumDim == -1 || lDim > lNumDim)
return -1;
pdwTemp = (unsigned long *)pItem->m_pData;
pdwTemp++; // skip total size
pdwTemp++; // skip number of dimensions
for(iCnt = 0; iCnt < lDim; iCnt++)
pdwTemp++;
return *pdwTemp;
}
//***************************************************************************
//
// BYTE * GetDataElemPtr
//
// DESCRIPTION:
//
// Used to get the pointer to a particular data element. Note that this is
// usually used internally.
//
// PARAMETERS:
//
// pItem Input. Data item to use.
// plDims Input. Pointer to array of dimension values. Note
// that currenly only a single dimension is supported.
// vtSimple Input. Variant type of the data with the VT_ARRAY
// and VT_BYREF bits cleared.
//
// RETURN VALUE:
//
// pointer to the data.
//***************************************************************************
BYTE * GetDataElemPtr(CBMOFDataItem * pItem, long * plDims, DWORD vtSimple)
{
int iNumDim;
DWORD dwTotalDataSize;
BYTE * pEndOfData;
DWORD * pdwCurr;
DWORD * pdwCurrObj;
BYTE * pRow;
int iCnt;
// first check the number of dimensions.
iNumDim = GetNumDimensions(pItem);
if(iNumDim == -1)
return NULL;
if(iNumDim == 0) // simple case of scalar argument
return pItem->m_pData;
// for arrays, the data block starts off with this form,
// dwtotalsize, dwNumDimenstions, dwMostSigDimension... dwLeastSigDimension
// Since currently only 1 dimensional arrays are supported, a 5 element
// array would start with
// dwSize, 1, 5
pdwCurr = (DWORD *)pItem->m_pData;
dwTotalDataSize = *pdwCurr;
pEndOfData = pItem->m_pData + dwTotalDataSize;
pdwCurr+= 2; // skip to dimension list
pdwCurr += iNumDim; // skip of dimension sizes.
while((BYTE *)pdwCurr < pEndOfData)
{
// Each row has the format
// dwSizeOfRow, MostSigDimension ... dwLeastSignificentDimension+1,data
// For a one dimensional array, it would just be
// dwSizeOfRow, data
DWORD dwRowSize = *pdwCurr;
// test if this row is ok. Each row of data will have
// a set of Indicies for each higher dimension.
for(iCnt = 0; iCnt < iNumDim-1; iCnt++)
{
DWORD * pRowInd = pdwCurr +1 + iCnt;
if((long)*pRowInd != plDims[iCnt])
break;
}
if(iCnt >= iNumDim -1)
{
break; // found the row.
}
// go to the next row
pdwCurr = (DWORD *)((BYTE *)pdwCurr + dwRowSize);
}
if((BYTE *)pdwCurr >= pEndOfData)
return NULL;
pRow = (BYTE *)(pdwCurr + 1 + iNumDim -1);
for(iCnt = 0; iCnt < plDims[iNumDim-1]; iCnt++)
{
if(vtSimple == VT_BSTR)
pRow += 2*(wcslen((WCHAR *)pRow)+1);
else if(vtSimple == VT_EMBEDDED_OBJECT)
{
// Each embedded object starts off with its own size
pdwCurrObj = (DWORD *)pRow;
pRow += *pdwCurrObj;
}
else
pRow += iTypeSize(vtSimple);
}
return pRow;
}
//***************************************************************************
//
// int GetData
//
// DESCRIPTION:
//
//
// PARAMETERS:
//
// pItem Input. Data item to use.
// pRet Input/Output. Pointer to where the data is to be
// copied. For simple data, such as ints, this can just
// be a pointer to an int. For BSTRs, or embedded
// objects, this is treated as a pointer to a pointer
// and it is the responsibility of the caller to free
// the strings via BMOFFree().
// plDims Input. Pointer to array of dimension values. Note
// that currenly only a single dimension is supported.
// The first element in any dimension is 0.
// RETURN VALUE:
//
// Number of bytes of data.
//***************************************************************************
int GetData(CBMOFDataItem * pItem, BYTE * pRet, long * plDims)
{
DWORD dwSimple;
BYTE * pData;
LONG_PTR UNALIGNED *pLong = (LONG_PTR *)pRet; // easier for returning strings and embedded objs.
dwSimple = pItem->m_dwType &~ VT_ARRAY &~VT_BYREF;
pData = GetDataElemPtr(pItem, plDims, dwSimple);
if(pData == NULL)
return 0;
if(dwSimple == VT_BSTR)
{
// For strings, a new WCHAR buffer is returned. Note that
// SysAllocString isnt used so as to avoid any Ole dependencies.
BYTE * pStr;
DWORD dwSize = 2*(wcslen((WCHAR *)pData)+1);
pStr = BMOFAlloc(dwSize);
if (pStr != NULL)
{
*pLong = (LONG_PTR)pStr;
wcscpy((WCHAR *)pStr, (WCHAR *)pData);
} else {
dwSize = 0;
}
return dwSize;
}
else if(dwSimple == VT_EMBEDDED_OBJECT)
{
DWORD dwSize;
// This is the embedded object case.
*pLong = (LONG_PTR) CreateObj((WBEM_Object *)pData);
if ((PVOID)*pLong != NULL)
{
dwSize = sizeof(long);
} else {
dwSize = 0;
}
return(dwSize);
}
else
{
memcpy((void *)pRet, (void *)pData, iTypeSize(dwSimple));
return iTypeSize(dwSimple);
}
}

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