138 lines
2.9 KiB
C++
138 lines
2.9 KiB
C++
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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EmulateWriteFile.cpp
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Abstract:
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On NT, WriteFile requires the buffer passed in to be non-null. But Win9x
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assumes you want to write zeroes if the buffer is NULL. This shim emulates
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the Win9x behavior.
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Notes:
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This is a general purpose shim.
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History:
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01/21/2000 linstev Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(EmulateWriteFile)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(WriteFile)
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APIHOOK_ENUM_ENTRY(AVIStreamWrite)
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APIHOOK_ENUM_END
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typedef HRESULT (*_pfn_AVIStreamWrite)(PAVISTREAM pavi, LONG lStart, LONG lSamples, LPVOID lpBuffer, LONG cbBuffer, DWORD dwFlags, LONG * plSampWritten, LONG * plBytesWritten);
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/*++
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Allocate a buffer as required.
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--*/
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BOOL
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APIHOOK(WriteFile)(
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HANDLE hFile,
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LPCVOID lpBuffer,
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DWORD nNumberOfBytesToWrite,
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LPDWORD lpNumberOfBytesWritten,
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LPOVERLAPPED lpOverlapped
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)
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{
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BOOL bRet;
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if (!lpBuffer) {
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void* pBuf = malloc(nNumberOfBytesToWrite);
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if (pBuf == NULL) {
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LOGN(eDbgLevelError, "[WriteFile] Failed to allocate %d bytes.", nNumberOfBytesToWrite);
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} else {
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ZeroMemory(pBuf, nNumberOfBytesToWrite);
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}
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bRet = ORIGINAL_API(WriteFile)(hFile, pBuf, nNumberOfBytesToWrite,
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lpNumberOfBytesWritten, lpOverlapped);
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free(pBuf);
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LOGN(eDbgLevelError, "[WriteFile] - null buffer of size %d.", nNumberOfBytesToWrite);
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} else {
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bRet = ORIGINAL_API(WriteFile)(hFile, lpBuffer, nNumberOfBytesToWrite,
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lpNumberOfBytesWritten, lpOverlapped);
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}
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return bRet;
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}
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/*++
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Allocate a buffer as required.
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--*/
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HRESULT
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APIHOOK(AVIStreamWrite)(
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PAVISTREAM pavi,
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LONG lStart,
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LONG lSamples,
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LPVOID lpBuffer,
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LONG cbBuffer,
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DWORD dwFlags,
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LONG * plSampWritten,
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LONG * plBytesWritten
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)
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{
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HRESULT hRet;
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if (!lpBuffer) {
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void* pBuf = malloc(cbBuffer);
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if (pBuf == NULL) {
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LOGN(eDbgLevelError, "[AVIStreamWrite] Failed to allocate %d bytes.", cbBuffer);
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} else {
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ZeroMemory(pBuf, cbBuffer);
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}
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hRet = ORIGINAL_API(AVIStreamWrite)(pavi, lStart, lSamples, pBuf,
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cbBuffer, dwFlags, plSampWritten, plBytesWritten);
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free(pBuf);
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LOGN(eDbgLevelError, "[AVIStreamWrite] - null buffer of size %d", cbBuffer);
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} else {
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hRet = ORIGINAL_API(AVIStreamWrite)(pavi, lStart, lSamples, lpBuffer,
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cbBuffer, dwFlags, plSampWritten, plBytesWritten);
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}
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return hRet;
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(KERNEL32.DLL, WriteFile)
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APIHOOK_ENTRY(AVIFIL32.DLL, AVIStreamWrite)
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HOOK_END
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IMPLEMENT_SHIM_END
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