124 lines
2.3 KiB
C++
124 lines
2.3 KiB
C++
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/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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MidTownMadness2.cpp
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Abstract:
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This app has a funky timing system whereby it waits for the processor that
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it's running on to return a 'stable' speed. The calculation is especially
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prone to problems on faster machines because there is greater uncertainty.
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Not sure why we hit this so easily on dual-procs - perhaps something about
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the scheduler wrt sleep and timeGetTime.
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Notes:
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This is an app specific shim.
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History:
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11/15/2001 linstev Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(MidTownMadness2)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(Sleep)
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APIHOOK_ENUM_ENTRY(timeGetTime)
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APIHOOK_ENUM_END
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DWORD g_dwState;
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DWORD g_dwTimer;
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DWORD g_dwLastTime;
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/*++
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After we call GetDlgItemTextA we convert the long path name to the short path name.
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--*/
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DWORD
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APIHOOK(timeGetTime)(VOID)
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{
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DWORD dwRet = ORIGINAL_API(timeGetTime)();
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switch (g_dwState) {
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case 0:
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// Initial state
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g_dwLastTime = dwRet;
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g_dwState++;
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break;
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case 1:
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// Shouldn't get here, reset state
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g_dwState = 0;
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break;
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case 2:
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// We're in the known bad zone, return our precalculated value
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dwRet = g_dwLastTime + g_dwTimer;
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g_dwState = 0;
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break;
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}
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return dwRet;
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}
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VOID
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APIHOOK(Sleep)(
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DWORD dwMilliseconds
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)
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{
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//
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// Check for their specific sleep and update our state if required
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//
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if (dwMilliseconds == 100 && g_dwState == 1) {
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g_dwState = 2;
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}
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ORIGINAL_API(Sleep)(dwMilliseconds);
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}
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/*++
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Register hooked functions
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--*/
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BOOL
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NOTIFY_FUNCTION(
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DWORD fdwReason)
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{
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if (fdwReason == SHIM_STATIC_DLLS_INITIALIZED) {
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// Make the calculation that the app does
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DWORD dwTimer = timeGetTime();
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Sleep(100);
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g_dwTimer = timeGetTime() - dwTimer;
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// Set initial state to 0
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g_dwState = 0;
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}
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return TRUE;
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}
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HOOK_BEGIN
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CALL_NOTIFY_FUNCTION
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APIHOOK_ENTRY(KERNEL32.DLL, Sleep)
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APIHOOK_ENTRY(WINMM.DLL, timeGetTime)
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HOOK_END
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IMPLEMENT_SHIM_END
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