HRESULT CbSysStringSize(ULONG cchSize, BOOL isByteLen, ULONG *result)
{
if (result == NULL)
return E_INVALIDARG;
// +2 for the null terminator
// + DWORD_PTR to store the byte length of the string
int constant = sizeof(WCHAR) + sizeof(DWORD_PTR) + WIN32_ALLOC_ALIGN;
if (isByteLen)
{
if (SUCCEEDED(ULongAdd(constant, cchSize, result)))
{
*result = *result & ~WIN32_ALLOC_ALIGN;
return S_OK;
}
}
else
{
ULONG temp = 0; // should not use in-place addition in ULongAdd
if (SUCCEEDED(ULongMult(cchSize, sizeof(WCHAR), &temp)) &
SUCCEEDED(ULongAdd(temp, constant, result)))
{
*result = *result & ~WIN32_ALLOC_ALIGN;
return S_OK;
}
}
return INTSAFE_E_ARITHMETIC_OVERFLOW;
}
BOOLEAN
BufferDisplay_Init(
IN HWND hCB,
IN HWND hEB,
IN INT nBuffers,
IN INT iBufferSize,
IN HIDP_REPORT_TYPE RType,
__deref_out_opt PBUFFER_DISPLAY *ppBufferDisplay
)
/*++
Routine Description:
This routine initializes the buffer display mechanism for a given report type
The display mechanism maintains a list of list of nBuffers, where is each
is buffer is of iBufferSize and hCB and hEB are handles to the combo box and
edit box for displaying the buffer.
The variable ppBufferDisplay is allocated block which is passed into other
buffer routines and contains information about the buffer for the other
routines.
This function will return FALSE if there was a problem allocating memory
--*/
{
#pragma warning(push)
#pragma warning(disable:28197) // BufferDisplay_Destroy frees memory
PBUFFER_DISPLAY pNewDisplay;
UINT reportBuffersSize = 0;
CHAR *pszBufferHeader;
CHAR szBufferName[24];
UINT iIndex;
UINT iCBIndex;
pNewDisplay = (PBUFFER_DISPLAY) malloc(sizeof(BUFFER_DISPLAY));
*ppBufferDisplay = NULL;
if (NULL == pNewDisplay)
{
return (FALSE);
}
if(S_OK != ULongMult(sizeof(REPORT_BUFFER), nBuffers, &reportBuffersSize))
{
free(pNewDisplay);
return (FALSE);
}
pNewDisplay->ReportBuffers = (PREPORT_BUFFER) malloc(reportBuffersSize);
if (NULL == pNewDisplay -> ReportBuffers)
{
free(pNewDisplay);
return (FALSE);
}
memset(pNewDisplay -> ReportBuffers, 0x00, reportBuffersSize);
pNewDisplay -> hBufferComboBox = hCB;
pNewDisplay -> hBufferEditBox = hEB;
pNewDisplay -> nReportBuffers = nBuffers;
pNewDisplay -> iBufferSize = iBufferSize;
pNewDisplay -> ReportType = RType;
switch (pNewDisplay -> ReportType)
{
case HidP_Input:
pszBufferHeader = "Input";
break;
case HidP_Output:
pszBufferHeader = "Output";
break;
case HidP_Feature:
pszBufferHeader = "Feature";
break;
default:
pszBufferHeader = "Other";
break;
}
for (iIndex = 0; iIndex < pNewDisplay -> nReportBuffers; iIndex++)
{
if(FAILED(StringCbPrintf(szBufferName, sizeof(szBufferName),
"%s Buffer #%d", pszBufferHeader, iIndex)))
{
BufferDisplay_Destroy(pNewDisplay);
return (FALSE);
}
iCBIndex = (INT) SendMessage(pNewDisplay -> hBufferComboBox,
CB_ADDSTRING,
0,
(LPARAM) szBufferName);
if (CB_ERR == iCBIndex || CB_ERRSPACE == iCBIndex)
{
BufferDisplay_Destroy(pNewDisplay);
return (FALSE);
}
iCBIndex = (INT) SendMessage(pNewDisplay -> hBufferComboBox,
CB_SETITEMDATA,
iCBIndex,
iIndex);
if (CB_ERR == iCBIndex || CB_ERRSPACE == iCBIndex)
{
BufferDisplay_Destroy(pNewDisplay);
return (FALSE);
}
}
SendMessage(pNewDisplay -> hBufferComboBox, CB_SETCURSEL, 0, 0);
BufferDisplay_ChangeSelection(pNewDisplay);
*ppBufferDisplay = pNewDisplay;
return (TRUE);
#pragma warning(pop) // 28197
}
