//*****************************************************************************
// Get info about the MD stream.
// Low level access to stream data. Intended for metainfo, and such.
//*****************************************************************************
__checkReturn
STDMETHODIMP
CLiteWeightStgdbRW::GetRawStreamInfo(
ULONG ix, // [IN] Stream ordinal desired.
const char **ppchName, // [OUT] put pointer to stream name here.
const void **ppv, // [OUT] put pointer to MD stream here.
ULONG *pcb) // [OUT] put size of the stream here.
{
HRESULT hr = NOERROR;
STORAGEHEADER sHdr; // Header for the storage.
PSTORAGESTREAM pStream; // Pointer to each stream.
ULONG i; // Loop control.
void *pData;
ULONG cbData;
#ifdef FEATURE_METADATA_CUSTOM_DATA_SOURCE
if (m_pStgIO == NULL)
IfFailGo(COR_E_NOTSUPPORTED);
#endif
pData = m_pStgIO->m_pData;
cbData = m_pStgIO->m_cbData;
// Validate the signature of the format, or it isn't ours.
IfFailGo(MDFormat::VerifySignature((PSTORAGESIGNATURE) pData, cbData));
// Get back the first stream.
pStream = MDFormat::GetFirstStream(&sHdr, pData);
if (pStream == NULL)
{
Debug_ReportError("Invalid MetaData storage signature - cannot get the first stream header.");
IfFailGo(CLDB_E_FILE_CORRUPT);
}
// Check that the requested stream exists.
if (ix >= sHdr.GetiStreams())
return S_FALSE;
// Skip to the desired stream.
for (i = 0; i < ix; i++)
{
PSTORAGESTREAM pNext = pStream->NextStream();
// Check that stream header is within the buffer.
if (((LPBYTE)pStream >= ((LPBYTE)pData + cbData)) ||
((LPBYTE)pNext > ((LPBYTE)pData + cbData)))
{
Debug_ReportError("Stream header is not within MetaData block.");
hr = CLDB_E_FILE_CORRUPT;
goto ErrExit;
}
// Check that the stream data starts and fits within the buffer.
// need two checks on size because of wraparound.
if ((pStream->GetOffset() > cbData) ||
(pStream->GetSize() > cbData) ||
((pStream->GetSize() + pStream->GetOffset()) > cbData))
{
Debug_ReportError("Stream data are not within MetaData block.");
hr = CLDB_E_FILE_CORRUPT;
goto ErrExit;
}
// Pick off the next stream if there is one.
pStream = pNext;
}
if (pStream != NULL)
{
*ppv = (const void *)((const BYTE *)pData + pStream->GetOffset());
*pcb = pStream->GetSize();
*ppchName = pStream->GetName();
}
else
{
*ppv = NULL;
*pcb = 0;
*ppchName = NULL;
// Invalid input to the method
hr = CLDB_E_FILE_CORRUPT;
}
ErrExit:
return hr;
} // CLiteWeightStgdbRW::GetRawStreamInfo
HRESULT CLiteWeightStgdb<MiniMd>::InitOnMem(
ULONG cbData, // count of bytes in pData
LPCVOID pData) // points to meta data section in memory
{
STORAGEHEADER sHdr; // Header for the storage.
PSTORAGESTREAM pStream; // Pointer to each stream.
int bFoundMd = false; // true when compressed data found.
int i; // Loop control.
HRESULT hr = S_OK;
// Don't double open.
_ASSERTE(m_pvMd == NULL && m_cbMd == 0);
// Validate the signature of the format, or it isn't ours.
if (FAILED(hr = MDFormat::VerifySignature((PSTORAGESIGNATURE) pData, cbData)))
goto ErrExit;
m_MiniMd.m_hotTableDirectory = NULL;
// Get back the first stream.
pStream = MDFormat::GetFirstStream(&sHdr, pData);
if (pStream == NULL)
IfFailGo(CLDB_E_FILE_CORRUPT);
// Loop through each stream and pick off the ones we need.
for (i=0; i<sHdr.GetiStreams(); i++)
{
// Pick off the location and size of the data.
void *pvCurrentData = (void *) ((BYTE *) pData + pStream->GetOffset());
ULONG cbCurrentData = pStream->GetSize();
// Get next stream
PSTORAGESTREAM pNext = pStream->NextStream();
// Range check
if ((LPBYTE) pStream >= (LPBYTE) pData + cbData ||
(LPBYTE) pNext > (LPBYTE) pData + cbData )
{
IfFailGo( CLDB_E_FILE_CORRUPT );
}
if ( (LPBYTE) pvCurrentData >= (LPBYTE) pData + cbData ||
(LPBYTE) pvCurrentData + cbCurrentData > (LPBYTE) pData + cbData )
{
IfFailGo( CLDB_E_FILE_CORRUPT );
}
// String pool.
if (strcmp(pStream->GetName(), STRING_POOL_STREAM_A) == 0)
{
METADATATRACKER_ONLY(MetaDataTracker::NoteSection(TBL_COUNT + MDPoolStrings, pvCurrentData, cbCurrentData, 1));
IfFailGo( m_MiniMd.m_Strings.InitOnMemReadOnly(pvCurrentData, cbCurrentData) );
}
// Literal String Blob pool.
else if (strcmp(pStream->GetName(), US_BLOB_POOL_STREAM_A) == 0)
{
METADATATRACKER_ONLY(MetaDataTracker::NoteSection(TBL_COUNT + MDPoolUSBlobs, pvCurrentData, cbCurrentData, 1));
IfFailGo( m_MiniMd.m_USBlobs.InitOnMemReadOnly(pvCurrentData, cbCurrentData) );
}
// GUID pool.
else if (strcmp(pStream->GetName(), GUID_POOL_STREAM_A) == 0)
{
METADATATRACKER_ONLY(MetaDataTracker::NoteSection(TBL_COUNT + MDPoolGuids, pvCurrentData, cbCurrentData, 1));
IfFailGo( m_MiniMd.m_Guids.InitOnMemReadOnly(pvCurrentData, cbCurrentData) );
}
// Blob pool.
else if (strcmp(pStream->GetName(), BLOB_POOL_STREAM_A) == 0)
{
METADATATRACKER_ONLY(MetaDataTracker::NoteSection(TBL_COUNT + MDPoolBlobs, pvCurrentData, cbCurrentData, 1));
IfFailGo( m_MiniMd.m_Blobs.InitOnMemReadOnly(pvCurrentData, cbCurrentData) );
}
// Found the compressed meta data stream.
else if (strcmp(pStream->GetName(), COMPRESSED_MODEL_STREAM_A) == 0)
{
IfFailGo( m_MiniMd.InitOnMem(pvCurrentData, cbCurrentData) );
bFoundMd = true;
}
// Found the hot meta data stream
else if (strcmp(pStream->GetName(), HOT_MODEL_STREAM_A) == 0)
{
BYTE * hotStreamEnd = reinterpret_cast< BYTE * >( pvCurrentData ) + cbCurrentData;
ULONG * hotMetadataDir = reinterpret_cast< ULONG * >( hotStreamEnd ) - 2;
ULONG hotPoolsSize = *hotMetadataDir;
m_MiniMd.m_hotTableDirectory = (CMiniMd::HotTableDirectory *)
( reinterpret_cast< BYTE* >( hotMetadataDir ) - hotPoolsSize - sizeof(CMiniMd::HotTableDirectory) );
m_MiniMd.m_hotTableDirectory->CheckTables();
InitHotPools( hotMetadataDir );
}
// Pick off the next stream if there is one.
pStream = pNext;
}
// If the meta data wasn't found, we can't handle this file.
if (!bFoundMd)
{
IfFailGo( CLDB_E_FILE_CORRUPT );
}
else
{ // Validate sensible heaps.
IfFailGo( m_MiniMd.PostInit(0) );
}
// Save off the location.
m_pvMd = pData;
m_cbMd = cbData;
ErrExit:
return (hr);
}