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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//*****************************************************************************
// StgPoolReadOnly.cpp
//
//
// Read only pools are used to reduce the amount of data actually required in the database.
//
//*****************************************************************************
#include "stdafx.h" // Standard include.
#include <stgpool.h> // Our interface definitions.
#include "metadatatracker.h"
//
//
// StgPoolReadOnly
//
//
#if METADATATRACKER_ENABLED
MetaDataTracker *MetaDataTracker::m_MDTrackers = NULL;
BOOL MetaDataTracker::s_bEnabled = FALSE;
void (*MetaDataTracker::s_IBCLogMetaDataAccess)(const void *addr) = NULL;
void (*MetaDataTracker::s_IBCLogMetaDataSearch)(const void *result) = NULL;
#endif // METADATATRACKER_ENABLED
const BYTE StgPoolSeg::m_zeros[64] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
//*****************************************************************************
// Free any memory we allocated.
//*****************************************************************************
StgPoolReadOnly::~StgPoolReadOnly()
{
LIMITED_METHOD_CONTRACT;
}
//*****************************************************************************
// Init the pool from existing data.
//*****************************************************************************
HRESULT StgPoolReadOnly::InitOnMemReadOnly(// Return code.
void *pData, // Predefined data.
ULONG iSize) // Size of data.
{
CONTRACTL
{
NOTHROW;
INJECT_FAULT(return E_OUTOFMEMORY);
}
CONTRACTL_END
// Make sure we aren't stomping anything and are properly initialized.
_ASSERTE(m_pSegData == m_zeros);
// Create case requires no further action.
if (pData == NULL)
return E_INVALIDARG;
// Keep m_zeros data pointer if there's no content of the pool
if (iSize != 0)
{
m_pSegData = reinterpret_cast<BYTE*>(pData);
}
m_cbSegSize = iSize;
m_cbSegNext = iSize;
return S_OK;
}
//*****************************************************************************
// Prepare to shut down or reinitialize.
//*****************************************************************************
void StgPoolReadOnly::Uninit()
{
LIMITED_METHOD_CONTRACT;
m_pSegData = (BYTE*)m_zeros;
m_pNextSeg = 0;
}
//*****************************************************************************
// Convert a string to UNICODE into the caller's buffer.
//*****************************************************************************
HRESULT StgPoolReadOnly::GetStringW( // Return code.
ULONG iOffset, // Offset of string in pool.
__out_ecount(cchBuffer) LPWSTR szOut, // Output buffer for string.
int cchBuffer) // Size of output buffer.
{
STATIC_CONTRACT_NOTHROW;
STATIC_CONTRACT_FAULT;
HRESULT hr;
LPCSTR pString; // The string in UTF8.
int iChars;
IfFailRet(GetString(iOffset, &pString));
iChars = ::WszMultiByteToWideChar(CP_UTF8, 0, pString, -1, szOut, cchBuffer);
if (iChars == 0)
return (BadError(HRESULT_FROM_NT(GetLastError())));
return S_OK;
}
//*****************************************************************************
// Return a pointer to a null terminated blob given an offset previously
// handed out by Addblob or Findblob.
//*****************************************************************************
HRESULT
StgPoolReadOnly::GetBlob(
UINT32 nOffset, // Offset of blob in pool.
MetaData::DataBlob *pData)
{
STATIC_CONTRACT_NOTHROW;
STATIC_CONTRACT_FORBID_FAULT;
HRESULT hr;
UINT32 cbBlobContentSize;
// This should not be a necessary special case. The zero byte at the
// start of the pool will code for a length of zero. We will return
// a pointer to the next length byte, but the caller should notice that
// the size is zero, and should not look at any bytes.
// [SL] Yes, but we don't need all further computations and checks if iOffset==0
if (nOffset == 0)
{
pData->Clear();
return S_OK;
}
// Is the offset within this heap?
if (!IsValidOffset(nOffset))
{
Debug_ReportError("Invalid blob offset.");
IfFailGo(CLDB_E_INDEX_NOTFOUND);
}
IfFailGo(GetDataReadOnly(nOffset, pData));
if (!pData->GetCompressedU(&cbBlobContentSize))
{
Debug_ReportError("Invalid blob - size compression.");
IfFailGo(COR_E_BADIMAGEFORMAT);
}
if (!pData->TruncateToExactSize(cbBlobContentSize))
{
Debug_ReportError("Invalid blob - reaches behind the end of data block.");
IfFailGo(COR_E_BADIMAGEFORMAT);
}
return S_OK;
ErrExit:
pData->Clear();
return hr;
} // StgPoolReadOnly::GetBlob
//*****************************************************************************
// code:StgPoolReadOnly::GetBlob specialization with inlined check for valid offsets to avoid redundant code:StgPoolReadOnly::GetDataReadOnly calls.
// code:StgPoolReadOnly::GetDataReadOnly is not cheap because of it performs binary lookup in hot metadata.
//*****************************************************************************
HRESULT
StgBlobPoolReadOnly::GetBlob(
UINT32 nOffset, // Offset of blob in pool.
MetaData::DataBlob *pData)
{
STATIC_CONTRACT_NOTHROW;
STATIC_CONTRACT_FORBID_FAULT;
HRESULT hr;
UINT32 cbBlobContentSize;
// This should not be a necessary special case. The zero byte at the
// start of the pool will code for a length of zero. We will return
// a pointer to the next length byte, but the caller should notice that
// the size is zero, and should not look at any bytes.
// [SL] Yes, but we don't need all further computations and checks if iOffset==0
if (nOffset == 0)
{
pData->Clear();
return S_OK;
}
if (m_pSegData == m_zeros)
{
Debug_ReportError("Invalid blob offset.");
IfFailGo(CLDB_E_INDEX_NOTFOUND);
}
IfFailGo(GetDataReadOnly(nOffset, pData));
if (!pData->GetCompressedU(&cbBlobContentSize))
{
Debug_ReportError("Invalid blob - size compression.");
IfFailGo(CLDB_E_INDEX_NOTFOUND);
}
if (!pData->TruncateToExactSize(cbBlobContentSize))
{
Debug_ReportError("Invalid blob - reaches behind the end of data block.");
IfFailGo(CLDB_E_INDEX_NOTFOUND);
}
return S_OK;
ErrExit:
pData->Clear();
return hr;
} // StgBlobPoolReadOnly::GetBlob
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