;
;	File:		MFSDIR3.a
;
;	Contains:	This file contains routines using file names to specify file.
;
;	Copyright:	© 1982-1991 by Apple Computer, Inc., all rights reserved.
;
;	Change History (most recent first):
;
;		 <2>	 9/12/91	JSM		Add a header.
;	   <1.1>	11/10/88	CCH		Fixed Header.
;	   <1.0>	 11/9/88	CCH		Adding to EASE.
;	   <1.0>	 2/11/88	BBM		Adding file for the first time into EASEÉ
;				 9/24/86	BB		Updated to use new MPW equates.
;				 11/1/85	PWD		Fixed bug in GetCatInfo for MFS volume (MOVE.L vs. MOVE.W)
;				10/20/85	LAK		Flush control cache on exit of SetMFlType, SetMFlInfo,
;									ChgMFlLock.
;				10/16/85	PWD		Fixed SetFilTyp bug (used FilTyp instead of FlTyp).
;				 10/1/85	LAK		Adjusted for MFS use of TFS cache.
;				 9/25/85	PWD		Fixed bug in 'GetCatInfo' lookalike code in GetFileInfo (cleared
;									32 bytes)
;				  9/6/85	LAK		Courtesy clear of IORefNum before calling CkFileBusy for
;									GetFileInfo.
;				  5/1/85	PWD		Changed GetMFlInfo to clear ioDirFlg bit in ioFlAttrib field.
;				 3/13/85	PWD		Split off from SetFilTyp.
;				 2/28/85	PWD		Split off from FSDir3, leaving only MFS-specific code.
;				  9/1/83	LAK		Changed BPL to BCC in file name transfer to support file names >
;									127 chars in GetFileInfo.
;				 8/31/83	LAK		Changed GetFileInfo to return current file info for opened files
;									(from FCB information).
;				  6/6/83	LAK		Added changes to support ext fs, offline volumes.
;				 5/25/83	LAK		Adapted FndFilNam to new CmpString interface.
;				 1/16/83	LAK		Final pass changes . . . added SetFilLock,RstFilLock,SetFilType.
;				12/14/82	LAK		Undelete removal changes
;				12/13/82	LAK		Reworked all files for new file system data structures.
;				 1/12/82	LAK		Made string compare proc an OS call; code is in IOCore.
;

;_______________________________________________________________________
;
; External Routines:	GetMFSFlInfo,SetMFlInfo
;
; Internal Routines:	FindMFSFile
;
;_______________________________________________________________________

;_______________________________________________________________________
;
; Routine:		  SetMFlType
; Arguments:		A0.L (input)  -- I/O Parameter block for call
;					A1.L (input)  -- pointer to vol. buffer(from FndFilNam)
;					A2.L (input)  -- VCB ptr
;					D0.W (output) -- error code
;					A5.L (output) -- ptr to dir. entry (from FndFilNam)
;					Clobbers:
;					Preserves:
; Called By:	  SetFilType
; Function: 	  SetMflInfo sets the file type for MFS files in the directory
;				  block pointed to by A1, at the entry pointed to by A5.
;
; Modification history:
;	13-Mar-85  PWD	Split off from SetFilTyp.
;_______________________________________________________________________


			BLANKS		ON
			STRING		ASIS

SetMFlType	MOVE.B	IONewType(A0),FlTyp(A5) ; Ring in the new						<PWD 16Oct85>
			BRA.S	SRMFXit1				; And leave, clearing D0
											; (Marks vol. buffer block dirty)

;_______________________________________________________________________
;
; Routine:		  ChgMFlLock
;
; (c) 1983 Apple Computer, Inc.
;
; Arguments:	  A0.L (input)	-- pointer to I/O parameter block, uses
;									IOFileName,IOFileType,IODrvNum
;				  D0.W (output) -- 0 if file was found and set correctly.
; Calls:
; Called by:	SetFilLock/ResFilLock
; Function: 	Set or reset the file lock bit for MFS files.
;
; Modification History:
;  16 Jan 83  LAK  New today.
;  06 Jun 83  LAK  Broke out CkFilMod as a subroutine.
;  13 Mar 85  PWD  Split off from main entry (Set/Rst FilLock)
;
; Note: if the file is locked after it has already been opened with write
;	permission, the lock will not affect that opened file.	If the lock bit
;	is not changed by this command, the directory buffer is not marked dirty
;	(allows quick lock/unlocking of a group of file, regardless of their current
;	status).
;_______________________________________________________________________

ChgMFlLock	TST.B	FLckUnlck
			BEQ.S	@1					; br if we want to unlock it
			BSET	#FlWrtFlag,FlFlags(A5) ; lock it
			BNE.S	SRMFXit2		   ; br if already locked
			BRA.S	SRMFXit1			; otherwise, it's been modified

@1			BCLR	#FlWrtFlag,FlFlags(A5) ; unlock it
			BEQ.S	SRMFXit2			; br if already unlocked

SRMFXit1	MOVE.L	A1,A0				; (also setfilinfo exit)				<01Oct85>
			JSR 	MarkBlock			; mark buffer modified					<01Oct85>
			BSR 	MFSCtlFlush 		; flush control cache if it's too full  <20Oct85>
SRMFXit2	MOVEQ	#0,D0
SRMFXit3	BRA 	CmdDone

;_______________________________________________________________________
;
; Routine:		SetMFlInfo
;
; (c) 1983 Apple Computer, Inc.
;
; Arguments:	  A0.L (input)	-- pointer to File Info I/O parameter block, uses
;									IOFileName,IOFlAttrib,IOFlUsrWds
;				  D0.W (output) -- 0 if entry was found, error code otherwise
;				  File's entry is modified to reflect changes
; Calls:		FndFilNam
; Function: 	Sets the user-definable fields in a file's directory entry.
;				The caller specifies the filename and type, and the eight
;				user-defined words.  The file lock bit does not inhibit this
;				command.
;
; Modification History:
;  13 Dec 82  LAK  Modified for new file system data structures.
;  17 Jan 83  LAK  Latest changes: no longer used to change lock, type fields;
;					there are now 16 user-defined bytes.
;  06 Jun 83  LAK  Adapted to new offline, ext fs problems. Uses CkFilMod
;					and SRFLXit1 to save code.
;  09 Jul 84  GSS  Patched to write out creation and modification date info
;  13 Mar 85  PWD  Separated MFS-specific code out from FSDir3
;_______________________________________________________________________

SetMFlInfo
			MOVEM.L IOFlUsrWds(A0),D1-D4 ; get 16 user words
			MOVEM.L D1-D4,FlUsrWds(A5)	; transfer 16 user-defined bytes

			MOVEM.L IOFlCrDat(A0),D1-D2 ; get IOFlCrDat, IOFlMdDat
			MOVEM.L D1-D2,FlCrDat(A5)	; and store in FlCrDat, FlMdDat

			BRA.S	SRMFXit1			; exit ok, marking buffer modified

;_______________________________________________________________________
;
; Routine:		FndMFSFile,FndMFSFN2
;
; (c) 1983 Apple Computer, Inc.
;
; Arguments:	  A0.L (input)	-- pointer to I/O parameter block, uses:
;									IOFileName,IOFileType,IODrvNum
;				  D0.W (output) -- 0 if file was found, error code otherwise.
;				  D2.W (output) -- name length excluding any volume prefix
;				  A1.L (output) -- points to volume buffer (if name found)
;				  A2.L (output) -- pointer to appropriate VCB
;				  A4.L (output) -- pointer to input file name. If a volume was
;									specified will point to the colon, thereby
;									always pointing one byte ahead of the true
;									file name.
;				  A5.L (output) -- pointer to file directory entry in buffer.
;				  Preserves: D1,D5,A0
;				  Clobbers: all other registers (D3,D4,D6,D7,A3,A6)
;				  Note that the routine will return to one level above
;				   caller during the asynchronous reads.
;				  FndFN2 entry point for Rename (alternate volume may be used)
; Calls:		MyReadDB(via Rd1stDB and RdNxtDB)
; Called By:	Create,Delete,FileOpen,Rename,GetFileInfo,SetFileInfo
; Function: 	Locate a filename within the directory on a diskette
;				Search algorithm: if dir blk there, search it first;
;				if not found, start from beginning, skipping searched blk.
;
; Modification History:
;  08 Dec 82  LAK  Added FndFilNam entry point.
;  13 Dec 82  LAK  Rewrote. Removed index search mode.
;  14 Dec 82  LAK  Removed check for delete file.
;  17 Jan 83  LAK  Changes for last data structure mods: now checks for both
;					filename and filetype match.
;  05 Jun 83  LAK  Added checks for offline volume, external file system vols
;  28 Sep 84  GSS  Inserted patch for setting ReqstVol in ExtOffLinCk
;					(from CDHook in MSFileFix)
;  28-Feb-85  PWD  Split off from FndFilName to just handle only MFS volumes.
;  20-Sep-85  PWD  Added explicit check for zero-length files before launching
;					into search (used to be checked by FndFilNam already)
;_______________________________________________________________________

FndMFSFile	MOVE.L	(SP)+,A3			; get the caller's addr
			TST.B	D2					; Check file name length -				<20Sep85>
			BNE.S	@1					; If >0, it's OK                        <20Sep85>
			MOVEQ	#BdNamErr,D0		; Otherwise, complain					<20Sep85>
			BRA.S	MFFNExit			;										<20Sep85>

@1			MOVE.W	VCBNmFls(A2),D7 	; number of files on this volume
			BEQ.S	MFNFound			; if none, can't find this one.

			BSR 	MFSRd1stDB			; go for the first one					<01Oct85>
mfFNLoop	BEQ.S	scn4MNam			; br if ok
			CMP.W	#DirFulErr,D0		; reached end of directory?
			BNE.S	mfFNExit			; then file not found
mfNFound	MOVEQ	#FNFErr,D0			; file not found!
			BRA.S	mfFNExit

; have a block at (A5) - look for the file in this dir block

scn4MNam	MOVEQ	#0,D0				; clear for index
			MOVE.L	A4,A1				; requested string

@1			MOVE.W	D0,D4				; save D0
			TST.B	FlFlags(A5,D4)		; flags=0 means end of entries this blk
			BEQ.S	@3					; br if no more entries this block
			MOVE.B	FlTyp(A5,D4),D6 	; check for type match
			CMP.B	IOFileType(A0),D6	;
			BNE.S	@2					; br if no match

			MOVE.L	A0,-(SP)			; preserve A0
			LEA 	FlNam(A5,D4),A0 	; directory string
			MOVEQ	#0,D0
			MOVE.B	(A0)+,D0			; first string length
			SWAP	D0
			MOVE.W	D2,D0				; second string length
			_CmpString					; do they match?
			MOVE.L	(SP)+,A0
			BEQ.S	@4					; br if so

@2			SUBQ.W	#1,D7				; decr # files we checked
			BEQ.S	MFNFound			; exit if we checked them all . . .
			MOVE.W	D4,D0				; restore D0
			BSR 	GtNxEntry			; (A5,D0) point to next entry, D6 trashed
			BCS.S	@1					; br if not finished with this block

@3			BSR 	MFSRdNxtDB			; read next directory block 			<01Oct85>
			BRA.S	MFFNLoop

; we have our man . . .

@4			MOVE.L	A5,A1				; A1 = buffer pointer
			LEA 	0(A5,D4),A5 		; A5 = entry ptr, D0 = 0 here
mfFNExit	JMP 	(A3)

;_______________________________________________________________________
;
; Routine:		GetMFlInfo
;
; (c) 1983 Apple Computer, Inc.
;
; Arguments:	  A0.L (input)	-- pointer to File Info I/O parameter block, uses
;									all fields?
;				  D0.W (output) -- 0 if info was found, error code otherwise
; Calls:		FndFilNam(if searching by name)
; Function: 	Get information about a specific file from the file directory.
;				User can specify search by either filename or by index,
;				where the index specifies the file's offset from the beginning
;				of the directory.
;
;				An index of zero means search by filename and type.
;
; Modification History:
;  10 Dec 82  LAK  Modified for new file system data structures.
;  13 Dec 82  LAK  Removed delete file support.
;  17 Jan 83  LAK  Another passover.
;  06 Jun 83  LAK  Added changes to detect offline volumes, ext fs calls.
;  01 Sep 83  LAK  Changed BPL to BCC in file name transfer to support file
;					names > 127 chars.
;  10 Mar 85  PWD  Changed to search catalog for TFS volumes
;  25-Sep-85  PWD  Fixed bug in 'GetCatInfo' lookalike code (cleared 32 bytes)
;  <27Oct85>  PWD  Changed to re-join TFS code for FCB scan
;  <01Nov85>  PWD  Fixed bug in GetCatInfo for MFS volume (MOVE.L vs. MOVE.W)
;_______________________________________________________________________

GtMFlIBI	CMP.W	VCBNmFls(A2),D1 	; requesting an index larger than exists?
			BHI.S	GMFINFErr			; return file not found error?

; we are searching by index here: it's a bit tricky since we want to try
; to continue where we left off, if possible . . .

			MOVE.W	VCBBlLn(A2),D5		; len in blocks of dir
			MOVE.W	VCBDirSt(A2),D3 	; assume start from the beginning
			ADD.W	D3,D5				; max blk num + 1

			MOVE.W	VCBDirIndex(A2),D7	; useful file index, blk number pair
			BEQ.S	@0					; br if set back to zero

			CMP.W	D7,D1				; is our index >= this?
			BCS.S	@0					; br if not . . .
			MOVE.W	VCBDirBlk(A2),D3	; block number for this index
			BRA.S	@1

@0			MOVEQ	#1,D7				; index of first file this block

; at this point, D7=index of first file in current block
;				 D3=current block
;				 D5=max blk number + 1
;				 D1=requested index

@1			CMP.W	D5,D3				; have we reached max yet?
			BCC.S	GMFINFErr			; br if so
			MOVE.W	D3,VCBDirBlk(A2)	; form index,block pair to help next
			MOVE.W	D7,VCBDirIndex(A2)	;  GetFileInfo indexed search
			BSR 	MFSDirRead			; get the block 						<01Oct85>
			BNE.S	GMFINFErr
			MOVEQ	#0,D0				; index into block

@2			MOVEQ	#0,D6
			TST.B	FlFlags(A5,D0)		; valid entry?
			BEQ.S	@3					; br if no more entries
			CMP.W	D7,D1				; is it the requested one?
			BEQ.S	GotMIndFile
			ADDQ.W	#1,D7				; increment file index
			BSR 	GtNxEntry
			BCS.S	@2					; br if haven't reached end of block

@3			ADDQ.W	#1,D3				; try next block
			BRA.S	@1

GMFINFErr	MOVEQ	#FNFErr,D0			; file not found . . . hmmmm
GMFIExit	BRA 	CmdDone

GotMIndFile LEA 	0(A5,D0),A5 		; get pointer to entry . . .

; searched by index, so return the name . . .

			LEA 	FlNam(A5),A3		; file entry name ptr
			MOVE.L	IOFileName(A0),D0	; parameter block filename ptr
			BEQ.S	XferMFInfo			; skip it if it's zero
			MOVE.L	D0,A4

			MOVE.B	(A3),D0 			; name length
@1			MOVE.B	(A3)+,(A4)+ 		; name length, then name, byte by byte
			SUBQ.B	#1,D0
			BCC.S	@1

; The TFS trap entry point enters here for MFS volumes not searched by directory
; index, immediately following a call to FndFilNam:

GetMFlInfo

XferMFInfo
			LEA 	IOFlAttrib(A0),A4	; info destination
			MOVEQ	#(IOFQElSize-IOFlAttrib)/2-1,D0 ; number of words to copy - 1
			LEA 	FlFlags(A5),A3		; start of regular info to transfer
@1			MOVE.W	(A3)+,(A4)+ 		; move byte by byte
			DBRA	D0,@1

; Clear the directory flag for file information:

			BCLR	#ioDirFlg,ioFlAttrib(A0) ; 0 = file info returned

; Pure hack (=cut for code space):
; Make some of the additional TFS fields non-garbage, even for MFS:

			BTST	#HFSReq,HFSFlags	; Is this really a _GetCatInfo request?
			BEQ.S	@3					; Nah, don't be silly...
			MOVE.L	#FSRtDirID,ioFlParID(A0) ; 'Parent directory' is root...	<01Nov85>
			CLR.L	ioFlBkDat(A0)		; Never been backed up...

			MOVE.L	A0,-(SP)			; Create a scratch register
			LEA 	ioFlxFndrInfo(A0),A0 ; Point to finder info					<24Sep86>
			MOVEQ	#3,D0				; Set up to clear 3+1 longwords 		<25Sep85>
@2			CLR.L	(A0)+				; Zero finder info bytes
			DBRA	D0,@2				;
			MOVE.L	(SP)+,A0			; Restore 'scratch' register

@3			BRA 	CkFilStatus 		; Re-join TFS code for FCB scan 		<27Oct85>