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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.
//
// File: HotMetaData.cpp
//
//
// Class code:MetaData::HotMetaData represents a reader of hot data in MetaData hot stream.
//
// ======================================================================================
#include "external.h"
#include "hotmetadata.h"
#include "hotdataformat.h"
#include "hotheapsdirectoryiterator.h"
namespace MetaData
{
// --------------------------------------------------------------------------------------
//
// Class code:MetaData::HotMetaData represents a reader of hot data in MetaData hot stream.
//
__checkReturn
HRESULT
HotMetaData::Initialize(
DataBuffer data)
{
m_Data = data;
return S_OK;
} // HotMetaData::Initialize
// --------------------------------------------------------------------------------------
//
// Returns iterator of stored hot heaps (code:HotHeap).
//
__checkReturn
HRESULT
HotMetaData::GetHeapsDirectoryIterator(
HotHeapsDirectoryIterator *pHeapsDirectoryIterator)
{
if (m_Data.GetSize() < sizeof(struct HotMetaDataHeader))
{
Debug_ReportError("Invalid hot MetaData format - header doesn't fit into the hot data.");
return METADATA_E_INVALID_FORMAT;
}
struct HotMetaDataHeader *pHeader;
if (!m_Data.PeekDataAt<struct HotMetaDataHeader>(
m_Data.GetSize() - sizeof(struct HotMetaDataHeader),
&pHeader))
{
Debug_ReportInternalError("There's a bug, because previous size check succeeded.");
return METADATA_E_INTERNAL_ERROR;
}
// Get rid of the read header
DataBuffer heapsData = m_Data;
if (!heapsData.TruncateBySize(sizeof(struct HotMetaDataHeader)))
{
Debug_ReportInternalError("There's a bug, because previous size check succeeded.");
return METADATA_E_INTERNAL_ERROR;
}
DataBuffer heapsDirectoryData = heapsData;
if (!heapsDirectoryData.SkipToExactSize(pHeader->m_nHeapsDirectoryStart_NegativeOffset))
{
Debug_ReportError("Invalid hot MetaData format - heaps directory offset reaches in front of hot data.");
return METADATA_E_INVALID_FORMAT;
}
if (!heapsData.TruncateBySize(pHeader->m_nHeapsDirectoryStart_NegativeOffset))
{
Debug_ReportInternalError("There's a bug, because previous call to SkipToExactSize succeeded.");
return METADATA_E_INVALID_FORMAT;
}
pHeapsDirectoryIterator->Initialize(
heapsDirectoryData,
heapsData);
return S_OK;
} // HotMetaData::GetHeapsDirectoryIterator
}; // namespace MetaData
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