116 lines
2.8 KiB
C++
116 lines
2.8 KiB
C++
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//+-------------------------------------------------------------------------
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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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// History: 11-Dec-91 PhilipLa Created.
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//
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//--------------------------------------------------------------------------
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#include "msfhead.cxx"
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#pragma hdrstop
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#include <dfver.h>
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CMSFHeaderData::CMSFHeaderData(USHORT uSectorShift)
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{
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msfAssert((CSECTFATREAL != CSECTFAT) || (sizeof(CMSFHeaderData) == 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 = uSectorShift > SECTORSHIFT512 ? rmjlarge : 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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_csectDif = 0;
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_sectDifStart = ENDOFCHAIN;
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_csectFat = 1;
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_sectFat[0] = SECTFAT;
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_sectDirStart = SECTDIR;
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_csectMiniFat = 0;
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_sectMiniFatStart = ENDOFCHAIN;
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_signature = 0;
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_usReserved = 0;
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_ulReserved1 = 0;
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_csectDir = (uSectorShift > SECTORSHIFT512) ? 1 : 0;
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// Write DocFile signature
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memcpy(abSig, SIGSTG, CBSIGSTG);
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}
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CMSFHeader::CMSFHeader(USHORT uSectorShift)
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:_hdr(uSectorShift)
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{
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//We set this to dirty here. There are three cases in which a header
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// can be initialized:
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//1) Creating a new docfile.
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//2) Converting a flat file to a docfile.
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//3) Opening an existing file.
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//
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//We have a separate CMStream::Init* function for each of these cases.
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//
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//We set the header dirty, then explicitly set it clean in case 3
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// above. For the other cases, it is constructed dirty and we
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// want it that way.
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_fDirty = TRUE;
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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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// History: 21-Aug-92 PhilipLa Created.
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// 27-Jan-93 AlexT Changed to final signature
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//
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//--------------------------------------------------------------------------
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SCODE CMSFHeader::Validate(VOID) const
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{
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SCODE sc;
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USHORT uShift;
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sc = CheckSignature((BYTE *)_hdr.abSig);
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if (sc == S_OK)
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{
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uShift = GetSectorShift();
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// Check file format verson number
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if (GetDllVersion() > rmjlarge)
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return STG_E_OLDDLL;
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// check for unreasonably large or zero SectorShift
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if ((uShift > MAXSECTORSHIFT) ||
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(uShift == 0))
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{
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return STG_E_DOCFILECORRUPT;
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}
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}
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return sc;
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}
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