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122 lines
2.6 KiB
122 lines
2.6 KiB
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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CorrectACMArgs.cpp
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Abstract:
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This shim is to fix apps that pass incorrect cbSrcLength(too big) in the
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ACMSTREAMHEADER parameter to acmStreamConvert or acmStreamPrepareHeader.
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Notes:
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This is a general purpose shim.
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History:
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10/03/2000 maonis Created
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--*/
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#include "precomp.h"
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#include "msacmdrv.h"
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typedef MMRESULT (*_pfn_acmStreamConvert)(HACMSTREAM has, LPACMSTREAMHEADER pash, DWORD fdwConvert);
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typedef MMRESULT (*_pfn_acmStreamPrepareHeader)(HACMSTREAM has, LPACMSTREAMHEADER pash, DWORD fdwPrepare);
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IMPLEMENT_SHIM_BEGIN(CorrectACMArgs)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(acmStreamConvert)
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APIHOOK_ENUM_ENTRY(acmStreamPrepareHeader)
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APIHOOK_ENUM_END
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/*++
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On win9x it checks to ensure that the app doesn't pass in a too big cbSrcLength
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but this check is removed on NT. We fix this by mimicing what 9x is doing -
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calling acmStreamSize to check if the source length is too big.
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--*/
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MMRESULT
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APIHOOK(acmStreamConvert)(
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HACMSTREAM has,
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LPACMSTREAMHEADER pash,
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DWORD fdwConvert
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)
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{
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DWORD dwOutputBytes = 0;
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MMRESULT mmr = acmStreamSize(
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has, pash->cbDstLength, &dwOutputBytes, ACM_STREAMSIZEF_DESTINATION);
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if (mmr == MMSYSERR_NOERROR)
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{
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if(pash->cbSrcLength > dwOutputBytes)
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{
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DPFN( eDbgLevelWarning, "acmStreamConvert: cbSrcLength is too big (cbSrcLength=%u, cbDstLength=%u)\n",pash->cbSrcLength,pash->cbDstLength);
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return ACMERR_NOTPOSSIBLE;
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}
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mmr = ORIGINAL_API(acmStreamConvert)(
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has, pash, fdwConvert);
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}
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return mmr;
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}
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/*++
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Fix bad parameters.
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--*/
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MMRESULT
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APIHOOK(acmStreamPrepareHeader)(
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HACMSTREAM has,
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LPACMSTREAMHEADER pash,
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DWORD fdwPrepare
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)
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{
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UINT l = pash->cbSrcLength;
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while (IsBadReadPtr(pash->pbSrc, l))
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{
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if (l < 256)
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{
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DPFN( eDbgLevelError, "The source buffer is invalid");
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return MMSYSERR_INVALPARAM;
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}
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l-=256;
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}
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if (pash->cbSrcLength != l)
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{
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DPFN( eDbgLevelWarning, "Adjusted header from %d to %d\n", pash->cbSrcLength, l);
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}
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pash->cbSrcLength = l;
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return ORIGINAL_API(acmStreamPrepareHeader)(
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has, pash, fdwPrepare);
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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(MSACM32.DLL, acmStreamConvert)
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APIHOOK_ENTRY(MSACM32.DLL, acmStreamPrepareHeader)
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HOOK_END
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IMPLEMENT_SHIM_END
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