203 lines
3.5 KiB
C++
203 lines
3.5 KiB
C++
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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EmulateLZHandles.cpp
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Abstract:
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This shim hooks all of the LZ api calls and increments/decrements the
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handles so that a valid handle from the app's perspective is always > 0
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instead of >= 0.
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Fixes apps that treated a handle value of zero as an error; Win9x never
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returned handles of zero.
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History:
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07/25/2000 t-adams Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(EmulateLZHandles)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(LZClose)
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APIHOOK_ENUM_ENTRY(LZCopy)
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APIHOOK_ENUM_ENTRY(LZInit)
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APIHOOK_ENUM_ENTRY(LZOpenFile)
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APIHOOK_ENUM_ENTRY(LZRead)
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APIHOOK_ENUM_ENTRY(LZSeek)
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APIHOOK_ENUM_END
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#define KEY_SIZE_STEP MAX_PATH
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/*++
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Abstract:
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This function decrements the handles on the way in and increments
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handles that are passed back to the app
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History:
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07/25/2000 t-adams Created
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--*/
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VOID
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APIHOOK(LZClose)(INT hFile)
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{
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ORIGINAL_API(LZClose)(--hFile);
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}
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/*++
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Abstract:
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This function decrements the handles on the way in and increments
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handles that are passed back to the app
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History:
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07/25/2000 t-adams Created
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--*/
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LONG
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APIHOOK(LZCopy)(
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INT hSource,
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INT hDest
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)
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{
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return ORIGINAL_API(LZCopy)(--hSource, --hDest);
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}
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/*++
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Abstract:
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This function does not decrement the handle passed in to it
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because the handle passed in is supposed to be a regular HANDLE
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created by CreateFile. It does decrement handles that are
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passed back to the app because they represent LZ file handles.
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The differences between the handles are poorly documented in MSDN.
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History:
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07/25/2000 t-adams Created
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--*/
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INT
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APIHOOK(LZInit)(INT hfSource)
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{
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INT iRet = 0;
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// Don't decrement handle. See above.
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iRet = ORIGINAL_API(LZInit)(hfSource);
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// If there was an error, don't increment the error.
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if(iRet < 0) {
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return iRet;
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}
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return ++iRet;
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}
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/*++
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Abstract:
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This function decrements the handles on the way in and increments
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handles that are passed back to the app
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History:
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07/25/2000 t-adams Created
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--*/
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INT
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APIHOOK(LZOpenFile)(
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LPSTR lpFileName,
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LPOFSTRUCT lpReOpenBuf,
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WORD wStyle
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)
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{
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INT iRet = 0;
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iRet = ORIGINAL_API(LZOpenFile)(lpFileName, lpReOpenBuf, wStyle);
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// If there was an error, don't increment the error.
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if( iRet < 0 ) {
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return iRet;
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}
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return ++iRet;
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}
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/*++
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Abstract:
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This function decrements the handles on the way in and increments
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handles that are passed back to the app
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History:
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07/25/2000 t-adams Created
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--*/
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INT
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APIHOOK(LZRead)(
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INT hFile,
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LPSTR lpBuffer,
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INT cbRead
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)
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{
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return ORIGINAL_API(LZRead)(--hFile, lpBuffer, cbRead);
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}
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/*++
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Abstract:
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This function decrements the handles on the way in and increments
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handles that are passed back to the app
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History:
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07/25/2000 t-adams Created
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--*/
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LONG
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APIHOOK(LZSeek)(
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INT hFile,
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LONG lOffset,
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INT iOrigin
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)
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{
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return ORIGINAL_API(LZSeek)(--hFile, lOffset, iOrigin);
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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(LZ32.DLL, LZClose)
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APIHOOK_ENTRY(LZ32.DLL, LZCopy)
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APIHOOK_ENTRY(LZ32.DLL, LZInit)
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APIHOOK_ENTRY(LZ32.DLL, LZOpenFile)
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APIHOOK_ENTRY(LZ32.DLL, LZRead)
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APIHOOK_ENTRY(LZ32.DLL, LZSeek)
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HOOK_END
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IMPLEMENT_SHIM_END
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