94 lines
2.0 KiB
C++
94 lines
2.0 KiB
C++
//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1992.
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//
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// File: header.cxx
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//
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// Contents: Code to manage MSF header
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//
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// Classes: Defined in header.hxx
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//
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//--------------------------------------------------------------------------
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#include "msfhead.cxx"
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#include <dfver.h>
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CMSFHeader::CMSFHeader(USHORT uSectorShift)
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{
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msfAssert((CSECTFATREAL != CSECTFAT) || (sizeof(CMSFHeader) == HEADERSIZE));
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_uSectorShift = uSectorShift;
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_uMiniSectorShift = MINISECTORSHIFT;
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_ulMiniSectorCutoff = MINISTREAMSIZE;
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_clid = IID_NULL;
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_uByteOrder = 0xFFFE;
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_uMinorVersion = rmm;
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_uDllVersion = rmj;
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for (SECT sect = 0; sect < CSECTFAT; sect ++)
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{
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_sectFat[sect] = FREESECT;
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}
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SetDifLength(0);
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SetDifStart(ENDOFCHAIN);
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SetFatLength(1);
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SetFatStart(SECTFAT);
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SetDirStart(SECTDIR);
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SetMiniFatLength(0);
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SetMiniFatStart(ENDOFCHAIN);
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_signature = 0;
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_usReserved = 0;
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_ulReserved1 = _ulReserved2 = 0;
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// Write DocFile signature
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memcpy(abSig, SIGSTG, CBSIGSTG);
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CMSFHeader::Validate, public
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//
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// Synopsis: Validate a header.
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//
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// Returns: S_OK if header is valid.
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//
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//--------------------------------------------------------------------------
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//Identifier for first bytes of Beta 2 Docfiles
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const BYTE SIGSTG_B2[] = {0x0e, 0x11, 0xfc, 0x0d, 0xd0, 0xcf, 0x11, 0xe0};
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const BYTE CBSIGSTG_B2 = sizeof(SIGSTG_B2);
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SCODE CMSFHeader::Validate(VOID) const
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{
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// Check for ship Docfile signature first
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if (memcmp((void *)abSig, SIGSTG, CBSIGSTG) == 0)
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{
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// Check file format verson number
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if (GetDllVersion() <= rmj)
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return(S_OK);
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return(STG_E_OLDDLL);
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}
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// Check for Beta 2 Docfile signature
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if (memcmp((void *) abSig, SIGSTG_B2, CBSIGSTG_B2) == 0)
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return S_OK;
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return(STG_E_INVALIDHEADER);
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}
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