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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.
#include "stdafx.h"
#include "sigbuilder.h"
#include "ex.h"
void SigBuilder::AppendByte(BYTE b)
{
STANDARD_VM_CONTRACT;
Ensure(1);
m_pBuffer[m_dwLength++] = b;
}
void SigBuilder::AppendData(ULONG data)
{
STANDARD_VM_CONTRACT;
//
// Inlined logic from CorSigCompressData
//
if (data <= 0x7F)
{
Ensure(1);
m_pBuffer[m_dwLength++] = BYTE(data);
return;
}
if (data <= 0x3FFF)
{
Ensure(2);
DWORD dwLength = m_dwLength;
BYTE * pBuffer = m_pBuffer;
pBuffer[dwLength] = BYTE((data >> 8) | 0x80);
pBuffer[dwLength+1] = BYTE(data);
m_dwLength = dwLength + 2;
return;
}
if (data <= 0x1FFFFFFF)
{
Ensure(4);
DWORD dwLength = m_dwLength;
BYTE * pBuffer = m_pBuffer;
pBuffer[dwLength] = BYTE((data >> 24) | 0xC0);
pBuffer[dwLength+1] = BYTE(data >> 16);
pBuffer[dwLength+2] = BYTE(data >> 8);
pBuffer[dwLength+3] = BYTE(data);
m_dwLength = dwLength + 4;
return;
}
// We currently can only represent to 0x1FFFFFFF.
ThrowHR(COR_E_OVERFLOW);
}
void SigBuilder::AppendToken(mdToken tk)
{
STANDARD_VM_CONTRACT;
//
// Inlined logic from CorSigCompressToken
//
RID rid = RidFromToken(tk);
ULONG32 ulTyp = TypeFromToken(tk);
_ASSERTE(rid <= 0x3FFFFFF);
rid = (rid << 2);
// TypeDef is encoded with low bits 00
// TypeRef is encoded with low bits 01
// TypeSpec is encoded with low bits 10
// BaseType is encoded with low bit 11
//
if (ulTyp == g_tkCorEncodeToken[0])
{
// make the last two bits 00
// nothing to do
}
else if (ulTyp == g_tkCorEncodeToken[1])
{
// make the last two bits 01
rid |= 0x1;
}
else if (ulTyp == g_tkCorEncodeToken[2])
{
// make last two bits 0
rid |= 0x2;
}
else if (ulTyp == g_tkCorEncodeToken[3])
{
rid |= 0x3;
}
else
{
ThrowHR(COR_E_BADIMAGEFORMAT);
}
AppendData(rid);
}
void SigBuilder::AppendBlob(const PVOID pBlob, SIZE_T cbBlob)
{
STANDARD_VM_CONTRACT;
Ensure(cbBlob);
memcpy(m_pBuffer + m_dwLength, pBlob, cbBlob);
m_dwLength += (DWORD)cbBlob;
}
void SigBuilder::Grow(SIZE_T cbMin)
{
STANDARD_VM_CONTRACT;
DWORD dwNewAllocation = max(m_dwLength + (DWORD)cbMin, 2 * m_dwAllocation);
// Overflow checks
if (dwNewAllocation < m_dwLength || (dwNewAllocation - m_dwLength) < cbMin)
ThrowOutOfMemory();
BYTE * pNewAllocation = new BYTE[dwNewAllocation];
memcpy(pNewAllocation, m_pBuffer, m_dwLength);
BYTE * pOldAllocation = m_pBuffer;
m_pBuffer = pNewAllocation;
m_dwAllocation = dwNewAllocation;
if (pOldAllocation != m_prealloc)
delete [] pOldAllocation;
}
SigBuilder::~SigBuilder()
{
if (m_pBuffer != m_prealloc)
delete [] m_pBuffer;
}
SigBuilder::SigBuilder(DWORD cbPreallocationSize)
{
STANDARD_VM_CONTRACT;
m_dwLength = 0;
if (cbPreallocationSize <= sizeof(m_prealloc))
{
m_pBuffer = m_prealloc;
m_dwAllocation = sizeof(m_prealloc);
}
else
{
m_pBuffer = new BYTE[cbPreallocationSize];
m_dwAllocation = cbPreallocationSize;
}
}
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