\ DBF Struct

\ Copyright (C) 2000 Alex Malyshev (alexript@mail.ru)

\ This is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation; either version 2
\ of the License, or (at your option) any later version.

\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
\ GNU General Public License for more details.

\ You should have received a copy of the GNU General Public License
\ along with this program; if not, write to the Free Software
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

uses StartUp
uses Ext.struct
uses Files.fileio
uses Date.timedate
uses TTY.yesno
uses Ext.comment

struct
	char%             field Version
	char%             field lmYear
	char%             field lmMonth
	char%             field lmDay
	cell%             field NumberOfRecords
	short%            field 1stRecord
	short%            field RecordLen
	1 chars 16 chars  field Reserved1
	char%             field fIndex
	1 chars 3 chars   field Reserved2	
end-struct DBF3Header


struct
	1 chars 11 chars  field FieldName
	char%		  field DataType
	cell%             field FieldOff
	char%             field FieldLen
	1 chars 15 chars  field Reserved3
end-struct DBFSubRecord


struct
	cell%		  field hFile
	DBF3Header        field DBF3FileHeader
	cell%		  field SubRecords
end-struct DBF3File

: DBFFileA	( | aname  -- )
	CREATE   DBF3File %size ALLOT
	;


: DBFGetVersion	( aname -- n )
	DBF3FileHeader Version c@
	;
	
: DBFGetDate	( aname -- day month year )
	DBF3FileHeader
	DUP lmDay C@ 
	over lmMonth C@ 
	rot lmYear c@ 1900 +
	;
	
: DBFSetDate	{ aname d m yy -- }
	aname DBF3FileHeader
	DUP lmDay d swap c!
	DUP lmMonth m swap c!
	lmYear yy 1900 - swap c!
	;

: DBFGetNomberOfRecords		( aname -- n )
	DBF3FileHeader
	NumberOfRecords @
	;
	
: DBFGet1stRecordOff		( aname -- n )
	DBF3FileHeader
	1stRecord @ 65535 AND
	;

: DBFGetNumberOfFields		( aname -- n )
	DBFGet1stRecordOff  
	DBF3Header %size -
	DBFSubRecord %size /
	;

: DBFGetRecordLen		( aname -- n )
	DBF3FileHeader
	RecordLen @ 65535 AND
	;
	
: DBFIndex?			( aname -- f )
	DBF3FileHeader fIndex c@
	;

: DBFFreeSubRecords	( aname -- f )
	SubRecords @ FREE 0=
	;

: DBFReadSubRecords		{ aname -- f }
	DBFSubRecord %size aname DBFGetNumberOfFields * ALLOCATE 
	0= IF
		DUP aname SubRecords !
		DBFSubRecord %size aname DBFGetNumberOfFields *
		aname hFile @ read-file
		IF
			DROP
			aname DBFFreeSubRecords DROP
			FALSE
		ELSE	\ Reading Ok
			DBFSubRecord %size aname DBFGetNumberOfFields * =
		THEN
	ELSE
		FALSE
	THEN
	;

: DBFReadHeader	{ aname -- f }
	aname DBF3FileHeader DBF3Header %size aname hFile @ read-file
	0= IF
		DBF3Header %size = 
		if aname DBFReadSubRecords then		
	   ELSE
	        DROP FALSE
	   THEN
	;

: DBFOpenFile	{ aname addr u mode -- f }
	addr u
	isFileReaded
	if	
		mode
		open-file
		0= if 
			aname hFile  !
			aname DBFReadHeader
			
		else
		        false
		then
	else
		2drop
	        false
	then
	;
	
: DBFCloseFile	( aname -- f )
	DUP hFile @ close-file 0=
	SWAP DBFFreeSubRecords
	AND
	;

: .DBFVersion	( n -- )
	CASE
		3 OF ." FoxBASE+/dBASE III+/IV" ENDOF
		131 OF ." FoxPro/dBASE III+ with memo" ENDOF
		245 OF ." FoxPro with memo" ENDOF
		139 OF ." dBASE IV with memo" ENDOF
	ENDCASE
	;


\ ---------------------------------------------------

: DBFPrintHeader		( aname -- )
	CR
	DUP DBFGetVersion         ." Version:    " .DBFVersion CR
	DUP DBFGetDate            ." Date:       " .date CR
	DUP DBFGetNomberOfRecords ." Records:    " . CR
	DUP DBFGetNumberOfFields  ." Fields:     " DUP . ." ( 0 -- " 1- . ." )" CR
	DUP DBFGet1stRecordOff    ." 1st Rec:    " . CR
	DUP DBFGetRecordLen	      ." Len.of Rec: " . CR
	DBFIndex? ." Index: " .Yes/No CR
	;


\ ---------------------------------------------------

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