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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
#include "precomp.h"
// constants
#define BUFFER_INCREMENT 128
// helper function declarations
static HRESULT EnsureBufferSize(
__deref_out_bcount(cbSize) BYTE** ppbBuffer,
__in SIZE_T cbSize
);
// functions
extern "C" HRESULT BuffReadNumber(
__in_bcount(cbBuffer) const BYTE* pbBuffer,
__in SIZE_T cbBuffer,
__inout SIZE_T* piBuffer,
__out DWORD* pdw
)
{
Assert(pbBuffer);
Assert(piBuffer);
Assert(pdw);
HRESULT hr = S_OK;
SIZE_T cbAvailable = 0;
// get availiable data size
hr = ::SIZETSub(cbBuffer, *piBuffer, &cbAvailable);
ExitOnRootFailure(hr, "Failed to calculate available data size.");
// verify buffer size
if (sizeof(DWORD) > cbAvailable)
{
hr = E_INVALIDARG;
ExitOnRootFailure(hr, "Buffer too small.");
}
*pdw = *(const DWORD*)(pbBuffer + *piBuffer);
*piBuffer += sizeof(DWORD);
LExit:
return hr;
}
extern "C" HRESULT BuffReadNumber64(
__in_bcount(cbBuffer) const BYTE* pbBuffer,
__in SIZE_T cbBuffer,
__inout SIZE_T* piBuffer,
__out DWORD64* pdw64
)
{
Assert(pbBuffer);
Assert(piBuffer);
Assert(pdw64);
HRESULT hr = S_OK;
SIZE_T cbAvailable = 0;
// get availiable data size
hr = ::SIZETSub(cbBuffer, *piBuffer, &cbAvailable);
ExitOnRootFailure(hr, "Failed to calculate available data size.");
// verify buffer size
if (sizeof(DWORD64) > cbAvailable)
{
hr = E_INVALIDARG;
ExitOnRootFailure(hr, "Buffer too small.");
}
*pdw64 = *(const DWORD64*)(pbBuffer + *piBuffer);
*piBuffer += sizeof(DWORD64);
LExit:
return hr;
}
extern "C" HRESULT BuffReadString(
__in_bcount(cbBuffer) const BYTE* pbBuffer,
__in SIZE_T cbBuffer,
__inout SIZE_T* piBuffer,
__deref_out_z LPWSTR* pscz
)
{
Assert(pbBuffer);
Assert(piBuffer);
Assert(pscz);
HRESULT hr = S_OK;
DWORD cch = 0;
DWORD cb = 0;
SIZE_T cbAvailable = 0;
// get availiable data size
hr = ::SIZETSub(cbBuffer, *piBuffer, &cbAvailable);
ExitOnRootFailure(hr, "Failed to calculate available data size for character count.");
// verify buffer size
if (sizeof(DWORD) > cbAvailable)
{
hr = E_INVALIDARG;
ExitOnRootFailure(hr, "Buffer too small.");
}
// read character count
cch = *(const DWORD*)(pbBuffer + *piBuffer);
hr = ::DWordMult(cch, static_cast<DWORD>(sizeof(WCHAR)), &cb);
ExitOnRootFailure(hr, "Overflow while multiplying to calculate buffer size");
hr = ::SIZETAdd(*piBuffer, sizeof(DWORD), piBuffer);
ExitOnRootFailure(hr, "Overflow while adding to calculate buffer size");
// get availiable data size
hr = ::SIZETSub(cbBuffer, *piBuffer, &cbAvailable);
ExitOnRootFailure(hr, "Failed to calculate available data size for character buffer.");
// verify buffer size
if (cb > cbAvailable)
{
hr = E_INVALIDARG;
ExitOnRootFailure(hr, "Buffer too small to hold character data.");
}
// copy character data
hr = StrAllocString(pscz, cch ? (LPCWSTR)(pbBuffer + *piBuffer) : L"", cch);
ExitOnFailure(hr, "Failed to copy character data.");
*piBuffer += cb;
LExit:
return hr;
}
extern "C" HRESULT BuffReadStringAnsi(
__in_bcount(cbBuffer) const BYTE* pbBuffer,
__in SIZE_T cbBuffer,
__inout SIZE_T* piBuffer,
__deref_out_z LPSTR* pscz
)
{
Assert(pbBuffer);
Assert(piBuffer);
Assert(pscz);
HRESULT hr = S_OK;
DWORD cch = 0;
DWORD cb = 0;
SIZE_T cbAvailable = 0;
// get availiable data size
hr = ::SIZETSub(cbBuffer, *piBuffer, &cbAvailable);
ExitOnRootFailure(hr, "Failed to calculate available data size for character count.");
// verify buffer size
if (sizeof(DWORD) > cbAvailable)
{
hr = E_INVALIDARG;
ExitOnRootFailure(hr, "Buffer too small.");
}
// read character count
cch = *(const DWORD*)(pbBuffer + *piBuffer);
hr = ::DWordMult(cch, static_cast<DWORD>(sizeof(CHAR)), &cb);
ExitOnRootFailure(hr, "Overflow while multiplying to calculate buffer size");
hr = ::SIZETAdd(*piBuffer, sizeof(DWORD), piBuffer);
ExitOnRootFailure(hr, "Overflow while adding to calculate buffer size");
// get availiable data size
hr = ::SIZETSub(cbBuffer, *piBuffer, &cbAvailable);
ExitOnRootFailure(hr, "Failed to calculate available data size for character buffer.");
// verify buffer size
if (cb > cbAvailable)
{
hr = E_INVALIDARG;
ExitOnRootFailure(hr, "Buffer too small to hold character count.");
}
// copy character data
hr = StrAnsiAllocStringAnsi(pscz, cch ? (LPCSTR)(pbBuffer + *piBuffer) : "", cch);
ExitOnFailure(hr, "Failed to copy character data.");
*piBuffer += cb;
LExit:
return hr;
}
extern "C" HRESULT BuffReadStream(
__in_bcount(cbBuffer) const BYTE* pbBuffer,
__in SIZE_T cbBuffer,
__inout SIZE_T* piBuffer,
__deref_out_bcount(*pcbStream) BYTE** ppbStream,
__out SIZE_T* pcbStream
)
{
Assert(pbBuffer);
Assert(piBuffer);
Assert(ppbStream);
Assert(pcbStream);
HRESULT hr = S_OK;
DWORD64 cb = 0;
SIZE_T cbAvailable = 0;
// get availiable data size
hr = ::SIZETSub(cbBuffer, *piBuffer, &cbAvailable);
ExitOnRootFailure(hr, "Failed to calculate available data size for stream size.");
// verify buffer size
if (sizeof(DWORD64) > cbAvailable)
{
hr = E_INVALIDARG;
ExitOnRootFailure(hr, "Buffer too small.");
}
// read stream size
cb = *(const DWORD64*)(pbBuffer + *piBuffer);
*piBuffer += sizeof(DWORD64);
// get availiable data size
hr = ::SIZETSub(cbBuffer, *piBuffer, &cbAvailable);
ExitOnRootFailure(hr, "Failed to calculate available data size for stream buffer.");
// verify buffer size
if (cb > cbAvailable)
{
hr = E_INVALIDARG;
ExitOnRootFailure(hr, "Buffer too small to hold byte count.");
}
// allocate buffer
*ppbStream = (BYTE*)MemAlloc((SIZE_T)cb, TRUE);
ExitOnNull(*ppbStream, hr, E_OUTOFMEMORY, "Failed to allocate stream.");
// read stream data
memcpy_s(*ppbStream, cbBuffer - *piBuffer, pbBuffer + *piBuffer, (SIZE_T)cb);
*piBuffer += (SIZE_T)cb;
// return stream size
*pcbStream = (SIZE_T)cb;
LExit:
return hr;
}
extern "C" HRESULT BuffWriteNumber(
__deref_out_bcount(*piBuffer) BYTE** ppbBuffer,
__inout SIZE_T* piBuffer,
__in DWORD dw
)
{
Assert(ppbBuffer);
Assert(piBuffer);
HRESULT hr = S_OK;
// make sure we have a buffer with sufficient space
hr = EnsureBufferSize(ppbBuffer, *piBuffer + sizeof(DWORD));
ExitOnFailure(hr, "Failed to ensure buffer size.");
// copy data to buffer
*(DWORD*)(*ppbBuffer + *piBuffer) = dw;
*piBuffer += sizeof(DWORD);
LExit:
return hr;
}
extern "C" HRESULT BuffWriteNumber64(
__deref_out_bcount(*piBuffer) BYTE** ppbBuffer,
__inout SIZE_T* piBuffer,
__in DWORD64 dw64
)
{
Assert(ppbBuffer);
Assert(piBuffer);
HRESULT hr = S_OK;
// make sure we have a buffer with sufficient space
hr = EnsureBufferSize(ppbBuffer, *piBuffer + sizeof(DWORD64));
ExitOnFailure(hr, "Failed to ensure buffer size.");
// copy data to buffer
*(DWORD64*)(*ppbBuffer + *piBuffer) = dw64;
*piBuffer += sizeof(DWORD64);
LExit:
return hr;
}
extern "C" HRESULT BuffWriteString(
__deref_out_bcount(*piBuffer) BYTE** ppbBuffer,
__inout SIZE_T* piBuffer,
__in_z_opt LPCWSTR scz
)
{
Assert(ppbBuffer);
Assert(piBuffer);
HRESULT hr = S_OK;
DWORD cch = (DWORD)lstrlenW(scz);
SIZE_T cb = cch * sizeof(WCHAR);
// make sure we have a buffer with sufficient space
hr = EnsureBufferSize(ppbBuffer, *piBuffer + (sizeof(DWORD) + cb));
ExitOnFailure(hr, "Failed to ensure buffer size.");
// copy character count to buffer
*(DWORD*)(*ppbBuffer + *piBuffer) = cch;
*piBuffer += sizeof(DWORD);
// copy data to buffer
memcpy_s(*ppbBuffer + *piBuffer, cb, scz, cb);
*piBuffer += cb;
LExit:
return hr;
}
extern "C" HRESULT BuffWriteStringAnsi(
__deref_out_bcount(*piBuffer) BYTE** ppbBuffer,
__inout SIZE_T* piBuffer,
__in_z_opt LPCSTR scz
)
{
Assert(ppbBuffer);
Assert(piBuffer);
HRESULT hr = S_OK;
DWORD cch = (DWORD)lstrlenA(scz);
SIZE_T cb = cch * sizeof(CHAR);
// make sure we have a buffer with sufficient space
hr = EnsureBufferSize(ppbBuffer, *piBuffer + (sizeof(DWORD) + cb));
ExitOnFailure(hr, "Failed to ensure buffer size.");
// copy character count to buffer
*(DWORD*)(*ppbBuffer + *piBuffer) = cch;
*piBuffer += sizeof(DWORD);
// copy data to buffer
memcpy_s(*ppbBuffer + *piBuffer, cb, scz, cb);
*piBuffer += cb;
LExit:
return hr;
}
extern "C" HRESULT BuffWriteStream(
__deref_out_bcount(*piBuffer) BYTE** ppbBuffer,
__inout SIZE_T* piBuffer,
__in_bcount(cbStream) const BYTE* pbStream,
__in SIZE_T cbStream
)
{
Assert(ppbBuffer);
Assert(piBuffer);
Assert(pbStream);
HRESULT hr = S_OK;
DWORD64 cb = cbStream;
// make sure we have a buffer with sufficient space
hr = EnsureBufferSize(ppbBuffer, *piBuffer + cbStream + sizeof(DWORD64));
ExitOnFailure(hr, "Failed to ensure buffer size.");
// copy byte count to buffer
*(DWORD64*)(*ppbBuffer + *piBuffer) = cb;
*piBuffer += sizeof(DWORD64);
// copy data to buffer
memcpy_s(*ppbBuffer + *piBuffer, cbStream, pbStream, cbStream);
*piBuffer += cbStream;
LExit:
return hr;
}
// helper functions
static HRESULT EnsureBufferSize(
__deref_out_bcount(cbSize) BYTE** ppbBuffer,
__in SIZE_T cbSize
)
{
HRESULT hr = S_OK;
SIZE_T cbTarget = ((cbSize / BUFFER_INCREMENT) + 1) * BUFFER_INCREMENT;
if (*ppbBuffer)
{
if (MemSize(*ppbBuffer) < cbTarget)
{
LPVOID pv = MemReAlloc(*ppbBuffer, cbTarget, TRUE);
ExitOnNull(pv, hr, E_OUTOFMEMORY, "Failed to reallocate buffer.");
*ppbBuffer = (BYTE*)pv;
}
}
else
{
*ppbBuffer = (BYTE*)MemAlloc(cbTarget, TRUE);
ExitOnNull(*ppbBuffer, hr, E_OUTOFMEMORY, "Failed to allocate buffer.");
}
LExit:
return hr;
}
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