171 lines
5.4 KiB
C
171 lines
5.4 KiB
C
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#define cbLVIntrinsicMost 1024
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#define cbRECRecordMin (sizeof(RECHDR) + sizeof(WORD))
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// 2 + 2 (for offset to tagged fields) = 4
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#define cbRECRecordMost (cbNodeMost - cbNullKeyData - JET_cbKeyMost)
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// 4047 - 8 - 255 = 3784
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// For fixed columns, if null bit is 0, then column is null. If null bit is 1,
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// then column is non-null (opposite is true for variable columns -- great design!).
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// Note that the fid passed in should already be converted to an index (ie. should
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// subtract fidFixedLeast first).
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#define FixedNullBit( ifid ) ( 1 << ( (ifid) % 8 ) )
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#define FFixedNullBit( pbitNullity, ifid ) \
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( !( *(pbitNullity) & FixedNullBit( ifid ) ) ) // True if NULL
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#define SetFixedNullBit( pbitNullity, ifid ) \
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( *(pbitNullity) &= ~FixedNullBit( ifid ) ) // Set to 0 (null).
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#define ResetFixedNullBit( pbitNullity, ifid ) \
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( *(pbitNullity) |= FixedNullBit( ifid ) ) // Set to 1 (non-null)
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// Used to get offset from 2-byte VarOffset which includes null-bit.
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// For variable columns, if null bit is 0, then column is non-null. If null bit is 1,
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// then column is null (opposite is true for variable columns -- great design!).
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#define ibVarOffset(ibVarOffs) ( (ibVarOffs) & 0x0fff)
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#define FVarNullBit(ibVarOffs) ( (ibVarOffs) & 0x8000) // True if NULL
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#define SetVarNullBit(ibVarOffs) ( (ibVarOffs) |= 0x8000) // Set to 1 (null)
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#define ResetVarNullBit(ibVarOffs) ( (ibVarOffs) &= 0x7fff) // Set to 0 (non-null)
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// Used to flip highest bit of signed fields when transforming.
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#define maskByteHighBit (1 << (sizeof(BYTE)*8-1))
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#define maskWordHighBit (1 << (sizeof(WORD)*8-1))
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#define maskDWordHighBit (1L << (sizeof(ULONG)*8-1))
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#define bFlipHighBit(b) ((BYTE)((b) ^ maskByteHighBit))
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#define wFlipHighBit(w) ((WORD)((w) ^ maskWordHighBit))
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#define ulFlipHighBit(ul) ((ULONG)((ul) ^ maskDWordHighBit))
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/* The following are disk structures -- so pack 'em
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/**/
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#pragma pack(1)
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/* long column id is big-endian long
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/**/
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typedef LONG LID;
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/* long value column in record format
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/**/
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typedef struct
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{
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BYTE fSeparated;
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union
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{
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LID lid;
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BYTE rgb[];
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};
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} LV;
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/* long value root data format
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/**/
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typedef struct
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{
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ULONG ulReference;
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ULONG ulSize;
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} LVROOT;
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#pragma pack()
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#define fIntrinsic (BYTE)0
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#define fSeparate (BYTE)1
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#define FFieldIsSLong( pb ) ( ((LV *)(pb))->fSeparated )
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#define LidOfLV( pb ) ( ((LV *)(pb))->lid )
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#define FlagIntrinsic( pb ) ( ((LV *)(pb))->fSeparated = fIntrinsic )
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#define FlagSeparate( pb ) ( ((LV *)(pb))->fSeparated = fSeparate )
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#define fLVReference 0
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#define fLVDereference 1
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/* The following are disk structures -- so pack 'em
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/**/
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#pragma pack(1)
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// Record header (beginning of every data record)
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typedef struct _rechdr
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{
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BYTE fidFixedLastInRec; // highest fixed fid represented in record
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BYTE fidVarLastInRec; // highest var fid represented in record
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} RECHDR;
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// Structure imposed upon a tagged field occurance in a record
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typedef struct _tagfld
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{
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FID fid; // field id of occurance
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union
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{
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WORD cbData; // length of data, including null bit
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struct
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{
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WORD cb:15; // length of following data (null bit stripped)
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WORD fNull:1; // Null instance (only occurs if default value set)
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};
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};
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BYTE rgb[]; // data (extends off the end of the structure)
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} TAGFLD;
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#pragma pack()
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ULONG UlChecksum( BYTE *pb, ULONG cb );
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ERR ErrRECSetCurrentIndex( FUCB *pfucb, CHAR *szIndex );
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BOOL FRECIIllegalNulls( FDB *pfdb, LINE *plineRec );
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ERR ErrRECRetrieveColumn( FUCB *pfucb, FID *pfid, ULONG itagSequence, LINE *plineField, ULONG grbit );
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ERR ErrRECSetColumn( FUCB *pfucb, FID fid, ULONG itagSequence, LINE *plineField );
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VOID FLDFreeLVBuf( FUCB *pfucb );
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ERR ErrRECSetLongField(
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FUCB *pfucb,
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FID fid,
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ULONG itagSequence,
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LINE *plineField,
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JET_GRBIT grbit,
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LONG ibOffset,
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ULONG ulMax );
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ERR ErrRECRetrieveSLongField(
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FUCB *pfucb,
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LID lid,
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ULONG ibGraphic,
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BYTE *pb,
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ULONG cbMax,
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ULONG *pcbActual );
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ERR ErrRECDeleteLongFields( FUCB *pfucb, LINE *plineRecord );
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ERR ErrRECAffectLongFields( FUCB *pfucb, LINE *plineRecord, INT fAll );
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ERR ErrRECSeparateLV( FUCB *pfucb, LINE *plineField, LID *plid, FUCB **ppfucb );
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ERR ErrRECAOSeparateLV( FUCB *pfucb, LID *plid, LINE *plineField, JET_GRBIT grbit, LONG ibLongValue, ULONG ulMax );
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ERR ErrRECAffectSeparateLV( FUCB *pfucb, LID *plid, ULONG fLVAffect );
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ERR ErrRECAOIntrinsicLV(
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FUCB *pfucb,
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FID fid,
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ULONG itagSequence,
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LINE *pline,
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LINE *plineField,
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JET_GRBIT grbit,
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LONG ibLongValue );
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#define fSeparateAll (INT)0
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#define fReference (INT)1
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#define fDereference (INT)2
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#define fDereferenceRemoved (INT)3
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#define fDereferenceAdded (INT)4
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#define PtagfldNext( ptagfld ) ( (TAGFLD UNALIGNED *)( (BYTE *)( (ptagfld) + 1 ) + (ptagfld)->cb ) )
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#define FRECLastTaggedInstance( fidCurr, ptagfld, pbRecMax ) \
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( (BYTE *)PtagfldNext( (ptagfld) ) == (pbRecMax) || \
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PtagfldNext( (ptagfld) )->fid > (fidCurr) )
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#define PibRECVarOffsets( pbRec, pibFixOffs ) \
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( (WORD UNALIGNED *)( (pbRec) + \
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(pibFixOffs)[((RECHDR *)(pbRec))->fidFixedLastInRec] + \
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( ((RECHDR *)(pbRec))->fidFixedLastInRec + 7 ) / 8 ) )
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#define ibTaggedOffset( pbRec, pibFixOffs ) \
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( PibRECVarOffsets( pbRec, pibFixOffs )[((RECHDR *)(pbRec))->fidVarLastInRec+1-fidVarLeast] )
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#define ErrRECIRetrieveDefaultValue( pfdb, pfid, plineField ) \
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ErrRECIRetrieveColumn( pfdb, &(pfdb)->lineDefaultRecord, pfid, NULL, 1, plineField, 0 )
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