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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.
//*****************************************************************************
// StgPooli.h
//
//
// This is helper code for the string and blob pools. It is here because it is
// secondary to the pooling interface and reduces clutter in the main file.
//
//*****************************************************************************
#ifndef __StgPooli_h__
#define __StgPooli_h__
#include "utilcode.h" // Base hashing code.
//
//
// CPackedLen
//
//
//*****************************************************************************
// Helper class to pack and unpack lengths.
//*****************************************************************************
struct CPackedLen
{
enum {MAX_LEN = 0x1fffffff};
static int Size(ULONG len)
{
LIMITED_METHOD_CONTRACT;
// Smallest.
if (len <= 0x7F)
return 1;
// Medium.
if (len <= 0x3FFF)
return 2;
// Large (too large?).
_ASSERTE(len <= MAX_LEN);
return 4;
}
// Get a pointer to the data, and store the length.
static void const *GetData(void const *pData, ULONG *pLength);
// Get the length value encoded at *pData. Update ppData to point past data.
static ULONG GetLength(void const *pData, void const **ppData=0);
// Get the length value encoded at *pData, and the size of that encoded value.
static ULONG GetLength(void const *pData, int *pSizeOfLength);
// Pack a length at *pData; return a pointer to the next byte.
static void* PutLength(void *pData, ULONG len);
// This is used for just getting an encoded length, and verifies that
// there is no buffer or integer overflow.
static HRESULT SafeGetLength( // S_OK, or error
void const *pDataSource, // First byte of length.
void const *pDataSourceEnd, // End of valid source data memory
ULONG *pLength, // Encoded value
void const **ppDataNext); // Pointer immediately following encoded length
static HRESULT SafeGetLength( // S_OK, or error
BYTE const *pDataSource, // First byte of length.
BYTE const *pDataSourceEnd, // End of valid source data memory
ULONG *pLength, // Encoded value
BYTE const **ppDataNext) // Pointer immediately following encoded length
{
return SafeGetLength(
reinterpret_cast<void const *>(pDataSource),
reinterpret_cast<void const *>(pDataSourceEnd),
pLength,
reinterpret_cast<void const **>(ppDataNext));
}
// This performs the same tasks as GetLength above in addition to checking
// that the value in *pcbData does not extend *ppData beyond pDataSourceEnd
// and does not cause an integer overflow.
static HRESULT SafeGetData(
void const *pDataSource, // First byte of length.
void const *pDataSourceEnd, // End of valid source data memory
ULONG *pcbData, // Length of data
void const **ppData); // Start of data
static HRESULT SafeGetData(
BYTE const *pDataSource, // First byte of length.
BYTE const *pDataSourceEnd, // End of valid source data memory
ULONG *pcbData, // Length of data
BYTE const **ppData) // Start of data
{
return SafeGetData(
reinterpret_cast<void const *>(pDataSource),
reinterpret_cast<void const *>(pDataSourceEnd),
pcbData,
reinterpret_cast<void const **>(ppData));
}
// This is the same as GetData above except it takes a byte count instead
// of pointer to determine the source data length.
static HRESULT SafeGetData( // S_OK, or error
void const *pDataSource, // First byte of data
ULONG cbDataSource, // Count of valid bytes in data source
ULONG *pcbData, // Length of data
void const **ppData); // Start of data
static HRESULT SafeGetData(
BYTE const *pDataSource, // First byte of length.
ULONG cbDataSource, // Count of valid bytes in data source
ULONG *pcbData, // Length of data
BYTE const **ppData) // Start of data
{
return SafeGetData(
reinterpret_cast<void const *>(pDataSource),
cbDataSource,
pcbData,
reinterpret_cast<void const **>(ppData));
}
};
class StgPoolReadOnly;
//*****************************************************************************
// This hash class will handle strings inside of a chunk of the pool.
//*****************************************************************************
struct STRINGHASH : HASHLINK
{
ULONG iOffset; // Offset of this item.
};
class CStringPoolHash : public CChainedHash<STRINGHASH>
{
friend class VerifyLayoutsMD;
public:
CStringPoolHash(StgPoolReadOnly *pool) : m_Pool(pool)
{
LIMITED_METHOD_CONTRACT;
}
virtual bool InUse(STRINGHASH *pItem)
{
LIMITED_METHOD_CONTRACT;
return (pItem->iOffset != 0xffffffff);
}
virtual void SetFree(STRINGHASH *pItem)
{
LIMITED_METHOD_CONTRACT;
pItem->iOffset = 0xffffffff;
}
virtual ULONG Hash(const void *pData)
{
WRAPPER_NO_CONTRACT;
return (HashStringA(reinterpret_cast<LPCSTR>(pData)));
}
virtual int Cmp(const void *pData, void *pItem);
private:
StgPoolReadOnly *m_Pool; // String pool which this hashes.
};
//*****************************************************************************
// This version is for byte streams with a 2 byte WORD giving the length of
// the data.
//*****************************************************************************
typedef STRINGHASH BLOBHASH;
class CBlobPoolHash : public CChainedHash<STRINGHASH>
{
friend class VerifyLayoutsMD;
public:
CBlobPoolHash(StgPoolReadOnly *pool) : m_Pool(pool)
{
LIMITED_METHOD_CONTRACT;
}
virtual bool InUse(BLOBHASH *pItem)
{
LIMITED_METHOD_CONTRACT;
return (pItem->iOffset != 0xffffffff);
}
virtual void SetFree(BLOBHASH *pItem)
{
LIMITED_METHOD_CONTRACT;
pItem->iOffset = 0xffffffff;
}
virtual ULONG Hash(const void *pData)
{
STATIC_CONTRACT_NOTHROW;
STATIC_CONTRACT_GC_NOTRIGGER;
STATIC_CONTRACT_FORBID_FAULT;
ULONG ulSize;
ulSize = CPackedLen::GetLength(pData);
ulSize += CPackedLen::Size(ulSize);
return (HashBytes(reinterpret_cast<BYTE const *>(pData), ulSize));
}
virtual int Cmp(const void *pData, void *pItem);
private:
StgPoolReadOnly *m_Pool; // Blob pool which this hashes.
};
//*****************************************************************************
// This hash class will handle guids inside of a chunk of the pool.
//*****************************************************************************
struct GUIDHASH : HASHLINK
{
ULONG iIndex; // Index of this item.
};
class CGuidPoolHash : public CChainedHash<GUIDHASH>
{
friend class VerifyLayoutsMD;
public:
CGuidPoolHash(StgPoolReadOnly *pool) : m_Pool(pool)
{
LIMITED_METHOD_CONTRACT;
}
virtual bool InUse(GUIDHASH *pItem)
{
LIMITED_METHOD_CONTRACT;
return (pItem->iIndex != 0xffffffff);
}
virtual void SetFree(GUIDHASH *pItem)
{
LIMITED_METHOD_CONTRACT;
pItem->iIndex = 0xffffffff;
}
virtual ULONG Hash(const void *pData)
{
WRAPPER_NO_CONTRACT;
return (HashBytes(reinterpret_cast<BYTE const *>(pData), sizeof(GUID)));
}
virtual int Cmp(const void *pData, void *pItem);
private:
StgPoolReadOnly *m_Pool; // The GUID pool which this hashes.
};
#endif // __StgPooli_h__
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