133 lines
2.6 KiB
C++
133 lines
2.6 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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HTMLEditor8587.cpp
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Abstract:
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HTML Editor 8.5/8.7 Call CreateFileA without closing the
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handle that was opened with the first call to CreateFileA.
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This SHIM hooks CreateFileA and CloseHandle and ensures
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that the temporary file is deleted and the handle closed
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before the next call to CreateFileA with the same filename.
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This is an app specific shim.
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History:
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02/06/2001 prashkud Created
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--*/
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#include "precomp.h"
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// This module has been given an official blessing to use the str routines.
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#include "LegalStr.h"
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IMPLEMENT_SHIM_BEGIN(HTMLEditor8587)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(CreateFileA)
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APIHOOK_ENUM_ENTRY(CloseHandle)
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APIHOOK_ENUM_END
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HANDLE g_FileHandle = 0;
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/*++
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Hook CreateFileA so that we can monitor the filename
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and the handle and ensure that the previous handle that
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was opened is closed before this call to the same file.
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--*/
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HANDLE
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APIHOOK(CreateFileA)(
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LPCSTR lpFileName,
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DWORD dwDesiredAccess,
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DWORD dwShareMode,
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LPSECURITY_ATTRIBUTES lpsa,
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DWORD dwCreationDisposition,
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DWORD dwFlagsAndAttributes,
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HANDLE hTempFile
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)
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{
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if (g_FileHandle && (stristr(lpFileName, "\\working\\~tm") != NULL))
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{
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DeleteFileA(lpFileName);
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CloseHandle(g_FileHandle);
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g_FileHandle = 0;
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}
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if (stristr(lpFileName, "\\working\\~tm") != NULL)
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{
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g_FileHandle = ORIGINAL_API(CreateFileA)(
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lpFileName,
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dwDesiredAccess,
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dwShareMode,
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lpsa,
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dwCreationDisposition,
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dwFlagsAndAttributes,
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hTempFile
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);
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return g_FileHandle;
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}
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else
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{
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return ORIGINAL_API(CreateFileA)(
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lpFileName,
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dwDesiredAccess,
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dwShareMode,
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lpsa,
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dwCreationDisposition,
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dwFlagsAndAttributes,
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hTempFile
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);
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}
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}
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/*++
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Hook CloseHandle to ensure that the global handle that we maintain
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is set to '0'.
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--*/
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BOOL
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APIHOOK(CloseHandle)(
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HANDLE hObject
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)
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{
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BOOL bRet = FALSE;
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bRet = ORIGINAL_API(CloseHandle)(hObject);
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if (hObject == g_FileHandle)
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{
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g_FileHandle = 0;
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}
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return bRet;
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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, CreateFileA)
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APIHOOK_ENTRY(KERNEL32.DLL, CloseHandle)
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HOOK_END
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IMPLEMENT_SHIM_END
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