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Resource forks are included only for .rsrc files. These are DeRezzed into their data fork. 'ckid' resources, from the Projector VCS, are not included. The Tools directory, containing mostly junk, is also excluded.
156 lines
5.1 KiB
Plaintext
156 lines
5.1 KiB
Plaintext
;
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; File: BTIntf.a
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;
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; Copyright: © 1990-1992 by Apple Computer, Inc. All rights reserved.
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;
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; Change History (most recent first):
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;
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; <SM2> 11/3/92 SWC Changed INCLUDEs to a LOAD of StandardEqu.d.
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; <2> 4/11/90 S To make ioBTKCProc zeroed out as per Kenny Tung.
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;
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BLANKS ON
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STRING ASIS
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PRINT OFF
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LOAD 'StandardEqu.d'
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INCLUDE 'BTreeEqu.a'
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PRINT ON
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PRINT NOGEN
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;________________________________________________________________________________
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;
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; Routine: OpenUGBT
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;
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; Function: Open a file for B*-Tree access.
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;
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; This function will also update the B*-Tree's key descriptor if the
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; B*-Tree doesn't have one yet.
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;
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; Pascal interface:
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; Function OpenUGBT(VRefNum: Integer;
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; DirID: LongInt;
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; fileName: Str255;
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; OpenMode: Integer;
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; VAR BTRefNum: Integer): OSErr;
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;________________________________________________________________________________
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;
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OpenUGBT PROC EXPORT
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LINK A6,#-BTParamSize ; Allocate an HFS parameter block
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;
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; At this point the stack looks as follows:
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;
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; -BTParamSize(A6) --> Start of I/O parameter block.
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; (A6) --> Old A6
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; 4(A6) --> Return address
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; 8(A6) --> Address of BTRefNum (to be returned)
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; 12(A6) --> Open Mode
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; 14(A6) --> Filename string
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; 18(A6) --> DirID
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; 22(A6) --> Volume RefNum
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; 24(A6) --> Return value storage (2 bytes)
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;
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BTRefNum EQU 8 ; Address of BTRefNum (to be returned)
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BTOpenMode EQU 12 ; File open mode
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BTNamePtr EQU 14 ; Filename string
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BTDirID EQU 18 ; DirID
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BTVRefNum EQU 22 ; Volume RefNum
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Result EQU 24 ; Return value storage (2 bytes)
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ArgSize EQU Result-8 ; Size of argument block on stack (28 bytes)
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MOVE.L BTRefNum(A6),A1 ; Point to BTRefNum
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CLR.W (A1) ; Zero it out (in case of errors)
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@0 LEA -BTParamSize(A6),A0 ; Point to parameter block
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MOVE.W #(BTParamSize/2)-1,D0 ; DBRA word loop index
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@1 CLR.W (A0)+ ; ...cleared.
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DBRA D0,@1
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LEA -BTParamSize(A6),A0 ; Point to parameter block
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MOVE.W BTVRefNum(A6),ioVRefNum(A0) ; Set up VRefNum
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MOVE.L BTDirID(A6),ioDirID(A0) ; ... DirID,
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MOVE.L BTNamePtr(A6),ioFileName(A0) ; ... and Filename pointer
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; [ioFileType and ioOwnBuf are clear ]
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MOVE.B BTOpenMode+1(A6),ioPermssn(A0) ; Request R/W permission
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MOVE.L #0, ioBTKCProc(A0) ; Clear this field as per Kenny Tung Sangam 4/11/90
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_BTOpen
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BEQ.S @50 ; Continue if no error
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CMP.W #btNoKDErr,D0 ; No key descriptor?
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BNE.S @50 ; If other error, give up
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LEA UGKD,A1 ; Point to key descriptor
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MOVE.L A1,ioBTKDPtr(A0) ; Set up pointer to KD
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CLR.L ioBTKDReqCount(A0) ; Clear top 3 bytes of KD length
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MOVE.B (A1),ioBTKDReqCount+3(A0) ; Copy length of KD record
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_BTUpdateKD ; Try to update the key descriptor
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BEQ.S @0 ; If successful, retry _BTOpen call
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@50 MOVE.W D0,Result(A6) ; Set up to pass error on to user
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BNE.S @95 ; Punt if anything goes wrong
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MOVEA.L BTRefNum(A6),A1 ; Point to BTRefNum storage
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MOVE.W ioRefNum(A0),(A1) ; Return refNum for opened file.
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@95 UNLK A6 ; Release local storage
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MOVE.L (SP)+,A0 ; Save return address
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ADDA.W #ArgSize,SP ; Remove arguments
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JMP (A0) ; And return
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DC.B ($80+'O') ; Indicate start of procedure name
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DC.B 'PENUGBT' ; (for use by debugger)
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DC.W 0
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UGKD: DC.B 7 ; Key descriptor length = 7
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DC.B $00, $01 ; Skip 1 byte
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DC.B $06, $01 ; 1 unsigned longword
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DC.B $03, $01, $00 ; 1 Pascal string, not case sens, not diac. sens.
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ENDP
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;________________________________________________________________________________
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;
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; Routine: BldFSKey
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;
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; Function: Build a File-System B*-Tree key
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;
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; Pascal interface:
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; Procedure BldFSKey(keyDirID: LongInt; keyCName: Str31; keyBufPtr: BTKeyPtr);
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;________________________________________________________________________________
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;
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BldFSKey PROC EXPORT
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LINK A6,#0 ; LINK for debugging trail
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;
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; At this point the stack looks as follows:
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;
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; (A6) --> Old A6
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; 4(A6) --> Return address
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; 8(A6) --> Key buffer pointer
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; 12(A6) --> CName pointer
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; 16(A6) --> DirID
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;
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MOVEA.L 8(A6),A1 ; Point to key to be built
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MOVEA.L 12(A6),A0 ; Point to CName string
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MOVEQ #0,D0 ; Clear top 3 bytes
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MOVE.B (A0),D0 ; Pick up CName length
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; Add in: key filler (1)
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; DirID (4)
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; String length byte (1)
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; ----------------------
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ADDQ.L #6,D0 ; 6 bytes
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MOVE.B D0,(A1)+ ; ...which gives the total key length
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CLR.B (A1)+ ; leave a filler
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MOVE.L 16(A6),(A1)+; Move in DirID
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SUBQ.L #5,D0 ; Get back length of actual CName string
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_BlockMove ; Move in the CName string
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UNLK A6 ; Pop off call frame
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MOVE.L (SP)+,A0 ; Save return address
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ADD.W #12,SP ; Pop incoming arguments, leaving result
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JMP (A0) ; And return to the caller
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DC.B ($80+'B') ; Indicate start of procedure name
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DC.B 'LDFSKEY' ; (for use by debugger)
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DC.W 0
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ENDP
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END
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