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**
** $Id: OpenIFF.S,v 21.1 92/05/15 03:21:49 chris Exp $
** $Revision: 21.1 $
**
** $Filename: OpenIFF.S $
** $Author: chris $
** $Release: 19.1 $
** $Date: 92/05/15 03:21:49 $
**
** iff.library/IFFL_OpenIFF
**
** COPYRIGHT (C) 1987-1992 BY CHRISTIAN A. WEBER, BRUGGERWEG 2,
** CH-8037 ZUERICH, SWITZERLAND. ALL RIGHTS RESERVED. NO PART
** OF THIS SOFTWARE MAY BE COPIED, REPRODUCED, OR TRANSMITTED
** IN ANY FORM OR BY ANY MEANS, WITHOUT THE PRIOR WRITTEN PER-
** MISSION OF THE AUTHOR. USE AT YOUR OWN RISK.
**
IDNT IFFL_OpenIFF
SECTION text,CODE
INCLUDE "IFFLib.i"
XREF SetError,ClearError
XDEF OpenIFFFunc,OldOpenIFFFunc,OldNewOpenIFFFunc
******* iff.library/IFFL_OpenIFF ********************************************
*
* NAME
* IFFL_OpenIFF -- Open an IFF file for reading or writing
*
* SYNOPSIS
* iff = IFFL_OpenIFF( filename, mode )
* D0 A0 D0
*
* IFFL_HANDLE IFFL_OpenIFF( char *, ULONG )
*
* FUNCTION
* If mode == IFFL_MODE_READ:
* This function opens a file on a disk and looks whether it's an IFF
* file or not. If it is an IFF file, memory is allocated and the file
* is read into memory.
* If an error occurs, NULL is returned, and you can call
* dos.library/IoErr() to get the IFFERR_... error number.
*
* If mode == IFFL_MODE_WRITE:
* Initializes an IFF file handle for writing. You may create chunks
* with IFFL_PushChunk() and IFFL_PopChunk(), and you can write data
* using the IFFL_WriteChunkBytes() routine.
*
* INPUTS
* filename - Pointer to a null-terminated string
* mode - IFFL_MODE_READ: Open file for reading
* IFFL_MODE_WRITE: Open file for writing
*
* RESULT
* iff - IFF handle. Making assumptions about the internal structure
* of this handle is unwise, and may break in the future.
* If this function fails, NULL will be returned, and you may
* call IFFL_IFFError() to know the reason of the failure.
*
* SEE ALSO
* IFFL_CloseIFF(), IFFL_PushChunk(), IFFL_PopChunk(),
* IFFL_WriteChunkBytes(), IFFL_IFFError()
*
* BUGS
* None known
*
*****************************************************************************
OpenIFFFunc: movem.l d2-d6/a2/a5-a6,-(SP)
moveq.l #MEMF_ANY,d6 ; MemType: egal
tst.l d0 ; IFFL_MODE_READ ?
beq ReadMode
*****************************************************************************
* Schreib-Modus
movea.l a6,a5 ; A5 : IFFBase
move.l a0,d5 ; D5 : Filename
*** IFF-Handle allozieren
moveq.l #ifffh_SIZEOF,d0
moveq.l #1,d1
swap d1 ; MEMF_CLEAR
movea.l iffb_SysBase(a5),a6
JSRLIB AllocMem
tst.l d0
bne.b 1$
moveq.l #IFFL_ERROR_NOMEM,d0
bra.b .Error ; Error --->
1$:
movea.l d0,a2 ; A2 : IFF-Handle
move.l #IFFFH_MAGIC,ifffh_Magic(a2)
*** File zum Schreiben öffnen
move.l d5,d1 ; Name
move.l #MODE_NEWFILE,d2
movea.l iffb_DOSBase(a5),a6
JSRLIB Open
move.l d0,ifffh_File(a2)
bne.b 2$
moveq.l #IFFL_ERROR_OPEN,d0
.Error: bsr SetError
bra.b .End ; ---> Fertig
2$:
*** Header ('FORM\0\0\0\0') schreiben
move.l d0,d1 ; File
lea IFFHeader(PC),a0
move.l a0,d2
moveq.l #8,d3
JSRLIB Write
cmp.l d3,d0
beq.b 3$
moveq.l #IFFL_ERROR_WRITE,d0
bra.b .Error
3$:
*** Alles OK, IFF-Handle zurückgeben
bsr ClearError
move.l a2,d0 ; IFF-Handle
.End: bra OpenEnd ; ---> Fertig
******* iff.library/NewOpenIFF **********************************************
*
* NAME
* NewOpenIFF -- allocate memory for an IFF-file and read it
*
* SYNOPSIS
* >>> THIS FUNCTION IS OBSOLETE. USE IFFL_OpenIFF() INSTEAD <<<
*
* ifffile = NewOpenIFF( filename, memattr )
* D0 A0 D0
*
* IFFFILE OpenIFF( char * )
*
* FUNCTION
* This function opens a file on a disk and looks whether it's an IFF
* file or not. If it is an IFF file, memory is allocated and the file
* is read into memory. The 'memattr' argument is taken to define the
* memory type. Normally memattr is set to MEMF_ANY or MEMF_PUBLIC.
* If an error occurs, NULL is returned, and you can call
* IFFError() to get the error number.
*
* INPUTS
* filename - Pointer to a null-terminated string
* memattr - Memory requirements as used for Exec's AllocMem(),
* such as MEMF_CHIP, MEMF_PUBLIC ...
* (MEMF_CLEAR is not necessary)
*
* RESULT
* ifffile - 'FileHandle', points to the beginning of the IFF file
* ("FORM...."), Zero if unsuccessful. Call IFFError() to get
* the reason of the failure.
*
* SEE ALSO
* OpenIFF(), CloseIFF(), IFFError()
*
* BUGS
* None known
*
*****************************************************************************
OldNewOpenIFFFunc:
movem.l d2-d6/a2/a5-a6,-(SP)
move.l d0,d6 ; D6 : MemType
bra.b ReadMode
******* iff.library/OpenIFF *************************************************
*
* NAME
* OpenIFF -- allocate memory for an IFF-file and read it
*
* SYNOPSIS
* >>> THIS FUNCTION IS OBSOLETE. USE IFFL_OpenIFF() INSTEAD <<<
*
* ifffile = OpenIFF( filename )
* D0 A0
*
* IFFFILE OpenIFF( char * )
*
* FUNCTION
* This function does the same as the NewOpenIFF() routine
* above, except that you cannot specify the type of memory which is
* allocated for the file. Normally the type is 0 which means 'any
* memory', but if the IFF file type is '8SVX', the file is ALWAYS
* loaded into CHIP memory. If you wish to override these defaults,
* use NewOpenIFF() instead of OpenIFF().
*
* INPUTS
* filename - Pointer to a null-terminated string
*
* RESULT
* ifffile - 'FileHandle', points to the beginning of the IFF file
* ("FORM...."), 0 if unsuccessful. Call IFFError() to get the
* reason of the failure.
*
* BUGS
* None
*
* SEE ALSO
* NewOpenIFF(), CloseIFF(), IFFError()
*
*****************************************************************************
OldOpenIFFFunc: movem.l d2-d6/a2/a5-a6,-(SP)
moveq.l #-1,d6 ; Kein MemType angegeben
;; bra.b ReadMode
*****************************************************************************
* Lese-Modus
ReadMode: movea.l a6,a5 ; A5 : IFFBase
lea -12(SP),SP ; Arbeitsspeicher reservieren
moveq.l #0,d5 ; Fehlernummer rücksetzen
*** File öffnen
move.l a0,d1 ; Name
move.l #MODE_OLDFILE,d2 ; accessmode
movea.l iffb_DOSBase(a5),a6
JSRLIB Open
move.l d0,d4 ; D4 := FileHandle
bne.b 1$
moveq #IFFL_ERROR_OPEN,d5
bra.b .Error2 ; --->
1$:
*** Erste 12 Bytes lesen, testen ob 'FORM'
move.l d4,d1 ; File
move.l SP,d2 ; Adr
moveq.l #12,d3 ; Len
JSRLIB Read ; erste 3 Longwords lesen
cmpi.l #'FORM',(SP)
beq.b 2$
moveq #IFFL_ERROR_NOTIFF,d5
bra.b .Error1 ; --->
2$:
*** Testen ob Chip-Speicher erwünscht (bei 8SVX-Files)
move.l d6,d1 ; Default-Requirements
bpl.b 3$ ; sind gültig --->
moveq.l #MEMF_PUBLIC,d1
cmpi.l #'8SVX',8(SP) ; 8SVX-File ?
bne.b 3$ ; nein --->
moveq.l #MEMF_CHIP|MEMF_PUBLIC,d1 ; sonst CHIP-Memory!
3$:
*** Speicher für File reservieren
moveq.l #12,d2 ; 'Remember' + FORM....
move.l 4(SP),d3 ; D3 : FORM-Länge
add.l d3,d2 ; D2 : Gesamtlänge
subq.l #4,d3 ; FUCK!!! IFF-Typ ist ja schon gelesen!
move.l d2,d0
movea.l iffb_SysBase(a5),a6
JSRLIB AllocMem ; requirements von D1
movea.l d0,a2 ; A2 : IFFFile-Adresse
tst.l d0
bne.b 4$ ; OK --->
moveq #IFFL_ERROR_NOMEM,d5
bra.b .Error1 ; --->
4$:
*** File einladen
move.l d2,(a2)+ ; Länge des reserv. Bereichs
move.l d4,d1 ; File
move.l a2,d2 ; Adr
addq.l #8,d2 ; FORM.... schon gelesen!
addq.l #4,d2 ; IFF-Typ schon gelesen
movea.l iffb_DOSBase(a5),a6
JSRLIB Read ; D3 war schon Länge
tst.l d0
bpl.b 5$ ; OK --->
moveq #IFFL_ERROR_READ,d5
bra.b .Error1
5$:
movem.l (SP),d0-d2 ; FORM, Länge und Type
movem.l d0-d2,(a2) ; IFF-Filetyp
.Error1: move.l d4,d1 ; File
movea.l iffb_DOSBase(a5),a6
JSRLIB Close
.Error2: move.l d5,d0 ; Error ?
beq.b 6$ ; nein --->
bsr SetError ; Löscht auch D0
bra.b Ende
6$:
bsr ClearError
move.l a2,d0 ; Adresse als Return-Code
Ende:
lea 12(SP),SP ; Lokalen Speicher freigeben
OpenEnd: movem.l (SP)+,d2-d6/a2/a5-a6
rts
IFFHeader: dc.b "FORM",0,0,0,0
END
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