//*****************************************************************************
// Search the cached RegMetas for a given scope.
//*****************************************************************************
HRESULT LOADEDMODULES::FindCachedReadOnlyEntry(
LPCWSTR szName, // Name of the desired file.
DWORD dwOpenFlags, // Flags the new file is opened with.
RegMeta ** ppMeta) // Put found RegMeta here.
{
RegMeta * pRegMeta = 0;
BOOL bWillBeCopyMemory; // Will the opened file be copied to memory?
DWORD dwLowFileSize; // Low bytes of this file's size
DWORD dwLowFileTime; // Low butes of this file's last write time
HRESULT hr;
ULONG ixHash = 0;
IfFailGo(InitializeStatics());
{
LOCKREAD();
hr = S_FALSE; // We haven't found a match yet.
// Avoid confusion.
*ppMeta = NULL;
bWillBeCopyMemory = IsOfCopyMemory(dwOpenFlags);
// The cache is locked for read, so the list will not change.
// Figure out the size and timestamp of this file
WIN32_FILE_ATTRIBUTE_DATA faData;
if (!WszGetFileAttributesEx(szName, GetFileExInfoStandard, &faData))
return E_FAIL;
dwLowFileSize = faData.nFileSizeLow;
dwLowFileTime = faData.ftLastWriteTime.dwLowDateTime;
// Check the hash first.
ixHash = HashFileName(szName);
if ((pRegMeta = m_HashedModules[ixHash]) != NULL)
{
_ASSERTE(pRegMeta->IsReadOnly());
// Only match if the IsOfCopyMemory() bit is the same in both. This is because
// when ofCopyMemory is set, the file is not locked on disk, and may become stale
// in memory.
//
// Also, only match if the date and size are the same
if (pRegMeta->IsCopyMemory() == bWillBeCopyMemory &&
pRegMeta->GetLowFileTimeOfDBFile() == dwLowFileTime &&
pRegMeta->GetLowFileSizeOfDBFile() == dwLowFileSize)
{
// If the name matches...
LPCWSTR pszName = pRegMeta->GetNameOfDBFile();
#ifdef FEATURE_CASE_SENSITIVE_FILESYSTEM
if (wcscmp(szName, pszName) == 0)
#else
if (SString::_wcsicmp(szName, pszName) == 0)
#endif
{
ULONG cRefs;
// Found it. Add a reference, and return it.
*ppMeta = pRegMeta;
cRefs = pRegMeta->AddRef();
LOG((LF_METADATA, LL_INFO10, "Disp::OpenScope found cached RegMeta in hash: %#8x, crefs: %d\n", pRegMeta, cRefs));
return S_OK;
}
}
}
// Not found in hash; loop through each loaded modules
int count = s_pLoadedModules->Count();
for (int index = 0; index < count; index++)
{
pRegMeta = (*s_pLoadedModules)[index];
// If the module is read-only, and the CopyMemory bit matches, and the date
// and size are the same....
if (pRegMeta->IsReadOnly() &&
pRegMeta->IsCopyMemory() == bWillBeCopyMemory &&
pRegMeta->GetLowFileTimeOfDBFile() == dwLowFileTime &&
pRegMeta->GetLowFileSizeOfDBFile() == dwLowFileSize)
{
// If the name matches...
LPCWSTR pszName = pRegMeta->GetNameOfDBFile();
#ifdef FEATURE_CASE_SENSITIVE_FILESYSTEM
if (wcscmp(szName, pszName) == 0)
#else
if (SString::_wcsicmp(szName, pszName) == 0)
#endif
{
ULONG cRefs;
// Found it. Add a reference, and return it.
*ppMeta = pRegMeta;
cRefs = pRegMeta->AddRef();
// Update the hash.
m_HashedModules[ixHash] = pRegMeta;
LOG((LF_METADATA, LL_INFO10, "Disp::OpenScope found cached RegMeta by search: %#8x, crefs: %d\n", pRegMeta, cRefs));
return S_OK;
}
}
}
}
ErrExit:
// Didn't find it.
LOG((LF_METADATA, LL_INFO10, "Disp::OpenScope did not find cached RegMeta\n"));
_ASSERTE(hr != S_OK);
return hr;
} // LOADEDMODULES::FindCachedReadOnlyEntry
