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Assembly Source File | 1987-02-27 | 28.7 KB | 907 lines

page 74,132 title ARCV - Verbose ARC directory listing ; Special version of ARCV to be called by QB program ; usage: ; ; CALL ARCV (Workname$,"filename[.ARC]", RETCD%) ' CPC151AC ; ; notes: ; This code originated from ARCV 1.15d - Verbose ARC directory display ; written by V.Buerg and was modified to run as a called routine under ; Microsoft QuickBasic. ; ; Change 9/14/86 to dis-allow wildcards ; Change 1/1/87 to recognize squash format ; Change 2/18/87 to support network usage - - - - Jon Martin ' CPC151A print macro name ; display a field mov dx,offset name call prints endm printl macro text ; display a literal local txt,nxt mov dx,offset txt call prints jmp nxt txt db cr,lf,text db stopper nxt equ $ endm header struc ; archive header mbrcode db 0 ; compression code mbrname db 13 dup (0) ; file name mbrsize dw 0,0 ; file size in archive mbrdate dw 0 ; creation date mbrtime dw 0 ; creation time mbrcrc dw 0 ; cyclic redunancy check mbrlen dw 0,0 ; true file size, bytes header ends cseg segment public para 'CODE' assume cs:cseg,ds:cseg,es:cseg public arcv arcv proc far push bp ; save BASIC reg mov bp,sp ; get parameter list pointer mov cs:stkptr,sp ; save stack ptr mov cs:saveds,ds ; save QB seg reg mov cs:savees,es ; save QB seg reg mov cs:errlvl,0 ; init return code jmp start ; do our thing ; return with error error: mov ax,cs ; insure seg regs mov ds,ax ; for proper exit mov es,ax mov sp,cs:stkptr mov errlvl,1 ; set bad return code jmp arcv2a ; produce totals anyway ; set DOS error level and exit exit: mov sp,cs:stkptr ; restore entry stack value mov bx,word ptr cs:outhdl ; close listing file or bx,bx ; if it was opened jz exiting mov ah,3eh int 21h exiting: push ds ; restore QB dta mov dx,word ptr cs:savedta[2] mov ds,word ptr cs:savedta mov ah,1ah int 21h pop ds mov ds,word ptr cs:saveds ; recover QB seg regs mov es,word ptr cs:savees mov al,cs:errlvl ; get return code cbw mov bp,sp ; parm ptr from entry mov di,word ptr 6[bp] ; ptr to retcd variable stosw pop bp ret 6 ; clear parms from stack ' CPC151A subttl '--- constants, equates and work areas' page cr equ 13 lf equ 10 bel equ 7 tab equ 9 stopper equ 0 ; end of display line indicator arcmark equ 26 ; special archive marker arcver equ 9 ; highest compression code used stkptr dw 0 ; stack pointer upon entry errlvl db 0 ; dos error level returned flags db 0 ; find-first return code archdl dw 0 ; file handle arctitl db cr,lf,'Archive: ' arcname db 76 dup (stopper) fileptr dw 0 ; ptr to filename part of arcname savedta dw 0,0 ; addr of QB dta dta db 48 dup (0) ; data transfer area saveds dw 0 ; QB seg reg savees dw 0 ; QB seg reg outhdl dw 1 ; handle for output listing temp db 76 dup (stopper); and temporary file name ' CPC151A subttl '--- i/o control variables' page inbufsz equ 512 ; size of input buffer inadr dw offset inbuf ; offset to input buffer inptr dw offset inbuf ; offset to current byte insize dw inbufsz ; size of input buffer inlen dw 0 ; bytes left in buffer incurh dw 0 ; current file offset incurl dw 0 ; low word usage db cr,lf db 'QBARCV2 - Verbose ARC directory display for QuickBasic' ; ' CPC151A db cr,lf,lf,' Usage: call arcv (workname$,arcname[.ARC],result%' ; ' CPC151A db cr,lf,stopper ; display lines for verbose vhdr db cr,lf db cr,lf,'Name Length Stowage SF Size now Date Time CRC ' db cr,lf,'============ ======== ======== ==== ======== ========= ====== ====' db stopper vline db cr,lf vname db 14 dup (' ') vlength db ' 0 ' ; length in archive vstyle db ' ' ; compression method vfactor db ' xx% ' ; compression factor vsize db 10 dup (' ') ; actual file bytes vdate db 'dd ' ; creation date vmonth db 'mmm ' vyear db 'yy ' vtime db 'hh:mm ' ; creation time vcrc db 'xxxx' ; crc in hex db stopper hundred dw 100 ; for computing percentages totsf dw 0,0 ; average stowage factor totlen dw 0,0 ; total of file lengths totsize dw 0,0 ; total of file sizes totmbrs dw 0 ; total number of files ; final totals line vthdr db cr,lf,lf,'*Total ' ; ' CPC151A vtmbrs db ' ' vtlen db 8 dup (' '),' ' db 10 dup (' ') vtsf db ' % ' vtsize db 8 dup (' ') db cr,lf ; for tom db stopper sign db ' ' styles db ' ----- ' ; 1 = old, no compression db ' ----- ' ; 2 = new, no compression db ' Packed ' ; 3 = dle for repeat chars db 'Squeezed' ; 4 = huffman encoding db 'crunched' ; 5 = lz, no dle db 'crunched' ; 6 = lz with dle db 'Crunched' ; 7 = lz with readjust db 'Crunched' ; 8 = lz with readjust and dle db 'Squashed' ; 9 = 13-bit lz with no dle months db 'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ' subttl '--- mainline processing' page ; ; determine if command line or menu driven mode start: push ds mov ax,cs ; set local seg regs mov ds,ax mov es,ax mov word ptr inlen,ax ; initialize file variables mov word ptr incurh,ax mov word ptr incurl,ax push cx ; bug fix push di ; 03-Feb-1987 cld ; Steven M. Georgiades mov di,offset arcname mov al,0 ; Clears arcname for each call mov cx,76 rep stosb pop di pop cx pop ds ; ' CPC151A mov si,word ptr 10[bp] ; ptr to parameter vector ' CPC151A lodsw ; get string length ' CPC151A mov cx,ax ; ' CPC151A mov si,word ptr [si] ; get string offset ' CPC151A mov di,offset temp ; ' CPC151A ; copy first parameter ' CPC151A parm1: lodsb ; copy filename ' CPC151A stosb ; ' CPC151A loop parm1 ; loop until done ' CPC151A push ds ; ' CPC151A mov ax,cs ; set local seg regs ' CPC151A mov ds,ax ; ' CPC151A mov dx,offset temp ; open temporary file for output mov cx,0 mov ah,3ch int 21h mov outhdl,ax pop ds jnc parm2a ; ' CPC151A mov cs:errlvl,1 ; return error code jmp exit parm2a: mov si,word ptr 8[bp] ; ptr to parameter vector lodsw ; get string length mov cx,ax mov si,word ptr [si] ; get string offset or cx,cx ; any operand? jnz parm2b ; ' CPC151A print usage jmp exit ; copy second parameter ' CPC151A parm2b: ; ' CPC151A mov di,offset arcname parm2c: lodsb ; copy filename ' CPC151A stosb loop parm2c ; ' CPC151A ; find filename part parm2d: ; ' CPC151A mov ax,cs ; need local seg regs mov ds,ax mov es,ax mov si,offset arcname+75 ; end of filename stuff std mov cl,76 ; search for last path parm2e: ; ' CPC151A lodsb cmp al,'/' ; funny path delimiter? je parm2f ; ' CPC151A cmp al,'\' ; normal path delimiter? je parm2f ; ' CPC151A cmp al,':' ; bumped into drive? je parm2f ; ' CPC151A loop parm2e ; ' CPC151A dec si parm2f: ; ' CPC151A cld add si,2 ; point to where filename goes mov fileptr,si ; and save for later ; add default ARC extension if necessary mov si,fileptr ; start of filespec mov cx,13 parm10: lodsb cmp al,0 ; end of name? je parm11 cmp al,'.' ; got extension? je parm12 loop parm10 parm11: mov di,si ; ptr to end of name dec di mov ax,'A.' ; default extension stosw mov ax,'CR' stosw mov ax,0FF00h ; append stoppers stosw parm12: ; find first matching file getfirst: push es mov ah,2fh ; get current dta ptr int 21h ; returned in es:bx mov word ptr savedta,es mov word ptr savedta[2],bx pop es mov dx,offset dta ; set local dta for murkers mov ah,1ah int 21h ; re-initialize not_found: sub ax,ax ; reset totals counters mov totmbrs,ax mov totsize,ax mov totsize+2,ax mov totlen,ax mov totlen+2,ax mov totsf,ax mov inlen,ax mov incurl,ax mov incurh,ax mov dx,offset inbuf mov inptr,dx call openarc ; see if archive exists jnc arcv1 jmp exit page ; ; process next archive header entry arcv1: print arctitl print vhdr arcvnext: call gethdr ; load next header jnc arcv2 jmp exit ; all done arcv2: cmp archdr.mbrcode,0 ; archive eof? je arcv2a jmp arcvgo arcv2a: mov ax,totmbrs ; total files or ax,ax ; are there any? jnz format_totals jmp skip_totals format_totals: sub dx,dx mov si,offset vtmbrs-4 call format mov dx,totlen+2 ; total actual file size mov ax,totlen mov si,offset vtlen call format mov dx,totsize+2 ; total achive file size mov ax,totsize mov si,offset vtsize call format ; reduce the total size/length to word values mov bx,totlen ; get actual file size mov ax,totlen+2 mov cx,totsize ; length of file in archive mov dx,totsize+2 arcv2b: or ax,ax ; big number? jz arcv2c ; nope, can use it shr ax,1 ; yup, divide by two rcr bx,1 shr dx,1 rcr cx,1 jmp short arcv2b arcv2c: mov si,offset vtsf-5 ; format stowage factor mov ax,bx mov sign,' ' ; whata kludge cmp ax,cx ; arc is bigger than orig? jb arcv2c1 sub ax,cx ; amount saved jmp short arcv2f arcv2c1: sub ax,cx neg ax mov sign,'-' arcv2f: mul hundred ; to percentage add ax,50 adc dx,0 ; round up percent or bx,bx ; empty file? jnz arcv2d mov ax,100 jmp short arcv2e arcv2d: div bx arcv2e: sub dx,dx call format mov al,sign mov vtsf,al print vthdr ; display totals skip_totals: call closarc jmp exit ; ' CPC151A page ; ; format single line for each member arcvgo: mov di,offset vname ; copy file name mov si,offset archdr.mbrname mov cx,13 arcv3: lodsb cmp al,0 ; end of name? je arcv4 stosb loop arcv3 jmp short arcv5 arcv4: mov al,' ' ; pad with blanks rep stosb arcv5: inc totmbrs ; reduce the size/length to word values mov bx,archdr.mbrlen ; get actual file size mov ax,archdr.mbrlen+2 mov cx,archdr.mbrsize ; length of file in archive mov dx,archdr.mbrsize+2 arcv51: or ax,ax ; big number? jz arcv52 ; nope, can use it shr ax,1 ; yup, divide by two rcr bx,1 shr dx,1 rcr cx,1 jmp short arcv51 arcv52: mov si,offset vfactor-5 ; format stowage factor mov ax,bx ; low word of actual size mov sign,' ' cmp ax,cx ; arc member is larger? jb arcv520 sub ax,cx ; amount saved jmp arcv56 arcv520: sub ax,cx neg ax mov sign,'-' arcv56: mul hundred ; to percentage add ax,50 adc dx,0 ; round up percent or bx,bx ; empty file? jnz arcv53 mov ax,100 jmp short arcv54 arcv53: div bx arcv54: sub dx,dx cmp ax,100 ; archive fouled? jbe arcv55 sub ax,ax arcv55: call format mov al,sign mov vfactor,al sub bx,bx ; determine style mov bl,archdr.mbrcode mov cl,3 ; eight bytes each entry shl bx,cl lea si,styles-8[bx] ; get ptr to style name mov di,offset vstyle mov cx,8 rep movsb mov si,offset vsize ; format file size mov dx,archdr.mbrsize+2 mov ax,archdr.mbrsize add totsize,ax adc totsize+2,dx call format mov si,offset vlength ; format file length mov dx,archdr.mbrlen+2 mov ax,archdr.mbrlen add totlen,ax adc totlen+2,dx call format mov ax,archdr.mbrdate ; format file date call getdate mov ax,archdr.mbrtime ; format file time call gettime mov ax,archdr.mbrcrc ; format crc in hex mov di,offset vcrc call cvh print vline ; display this file info mov cx,word ptr archdr.mbrsize+2 mov dx,word ptr archdr.mbrsize add dx,incurl ; add current file offset adc cx,0 add cx,incurh mov ax,4200h ; skip over file data mov bx,archdl int 21h mov incurh,dx ; new position mov incurl,ax mov inlen,0 ; reset read buffer jmp arcvnext subttl ' - miscellaneous subroutines' page openarc proc near ; open new archive push bx mov byte ptr errlvl,0 mov dx,offset arcname mov ax,3d00h ; for input int 21h jc openerr mov archdl,ax ; save file handle clc pop bx ret openerr: printl 'Unable to open archive: ' print arcname jmp error openarc endp closarc proc near push bx mov bx,archdl ; previous handle or bx,bx ; already open? jz closed mov ah,3eh ; yes, so close it int 21h closed: mov archdl,0 pop bx ret closarc endp ; ; print string like int 21h function 9 prints proc near ; dx has offset to string push si ; ending in char x'ff' push bx push cx mov si,dx sub cx,cx ps1: lodsb cmp al,stopper ; ending hex ff? je ps9 inc cx ; incr text length jmp ps1 ps9: mov ah,40h ; write to file mov bx,outhdl ; using std out or temp file int 21h pop cx ; recover registers pop bx pop si ret prints endp page ; ; format the time time record hour:5,min:6,sec:5 ;packed time gettime proc near ;format the date mov di,offset vtime or ax,ax ;it is zero? jz gottime push ax ;save date and ax,mask hour ;get hour part mov cl,hour ;bits to shift shr ax,cl call cnvrt1 stosw mov al,':' stosb gt3: pop ax ;get the time back and ax,mask min ;get min part mov cl,min ;bits to shift call cnvrt stosw gottime:ret gettime endp cnvrt2 proc near ;convert to ascii call cnvrt cmp al,'0' ;suppress leading zero jne cnvrtd mov al,' ' ret cnvrt: shr ax,cl cnvrt1: aam ;make al into bcd or ax,'00' ; and to ascii xchg al,ah cnvrtd: ret cnvrt2 endp page ; ; format the date date record yr:7,mo:4,dy:5 ;packed date getdate proc near ;format the date or ax,ax ;is it zero? jz gotdate push ax ;save date and ax,mask yr ;get year part mov cl,yr ;bits to shift call cnvrt mov di,offset vyear or al,'8' ;adjust for base year stosw pop bx ;get the date back push bx ;save it and bx,mask mo ;get month part mov cl,mo ;bits to shift shr bx,cl add bx,bx ; form month table index add bx,bx lea si,word ptr months-4[bx] mov cx,3 mov di,offset vmonth rep movsb pop ax ;get the date back and ax,mask dy ;get day part mov cl,dy ;bits to shift call cnvrt mov di,offset vdate stosw gotdate:ret getdate endp page ; ; ripped from sdir.asm. how does this work? ddptr dw 0 format proc near ;formats a 32 bit integer in dx:ax push bp ; to ds:si push bx push di push si mov ddptr,si ;addr of target field mov di,dx ;routine uses di:si mov si,ax call printdd pop si pop di pop bx pop bp ret printdd: xor ax,ax ;zero out the mov bx,ax ; working mov bp,ax ; registers. mov cx,32 ;# bits of precision j1: shl si,1 rcl di,1 xchg bp,ax call j6 xchg bp,ax xchg bx,ax call j6 xchg bx,ax adc al,0 loop j1 mov cx,1710h mov ax,bx call j2 mov ax,bp j2: push ax mov dl,ah call j3 pop dx j3: mov dh,dl shr dl,1 ;move high shr dl,1 ; nibble to shr dl,1 ; the low shr dl,1 ; position. call j4 mov dl,dh j4: and dl,0fh ;mask low nibble jz j5 ;if not zero mov cl,0 j5: dec ch and cl,ch or dl,'0' ;fold in ascii zero sub dl,cl mov bx,ddptr mov [bx],dl ;ptr to next target field inc ddptr ret j6: adc al,al daa xchg al,ah adc al,al daa xchg al,ah ret format endp page cvh proc near ; convert 16-bit binary word in ax push di ; to hex ASCII string at ds:di push bx ; save registers push cx push dx mov dx,ax ; save 16-bits mov bl,dh ; third nibble mov cl,4 shr bl,cl mov al,hexchar[bx] stosb mov bl,dh ; last nibble and bl,0fh mov al,hexchar[bx] stosb mov bl,dl ; first nibble mov cl,4 sub bh,bh shr bl,cl ; isolate mov al,hexchar[bx] stosb mov bl,dl ; second nibble and bl,0fh ; isolate mov al,hexchar[bx] stosb pop dx ; restore registers pop cx pop bx pop di ret ; return hexchar db '0123456789ABCDEF' cvh endp subttl ' - i/o subroutines' page getc proc near ; return next byte in al push si ; or cf=1 for eof getc1: dec inlen ; any left in buffer jge getc2 ; yes, pick it up call getblk jnc getc1 pop si ; return cf=1 at eof ret getc2: mov si,inptr ; offset to next byte lodsb mov inptr,si add incurl,1 ; bump file offset adc incurh,0 pop si ret getc endp getblk proc near ; read next block push bx push cx push dx mov ah,3fh ; read from handle mov bx,archdl ; arc file handle mov cx,inbufsz ; input buffer size mov dx,offset inbuf ; offset to input buffer mov inptr,dx int 21h jc getblkr ; oops or ax,ax ; anything read? jnz getblka stc ; no, set cf=1 for eof jmp short getblkx ; and exit getblka: mov inlen,ax ; return count of bytes read getblkx: pop dx pop cx pop bx ret getblkr: printl 'I/O error reading ' print arcname jmp error ; gotta quit getblk endp subttl '--- load next archive header' page gethdr proc near mov cx,132 ; gotta look for the damn thing gethdr2: call getc ; get next file byte jc gethdrr1 ; premature eof cmp al,arcmark ; start of header? je gethdr3 ; yup, let's start cookin loop gethdr2 gethdrr1: printl 'Invalid archive format!' jmp error gethdr3: call getc ; get version code jc gethdrr1 mov archdr.mbrcode,al cmp al,arcver ; reasonable code? ja gethdrr1 ; nope, funny stuff cmp al,0 ; archive eof? je gethdr9 ; yup done mov cx,13 ; get member name mov di,offset archdr.mbrname gethdr4: call getc jc gethdrr1 stosb loop gethdr4 gethdr5: mov cx,10 ; length remaining cmp archdr.mbrcode,1 ; old format? je gethdr6 ; yes, it's short mov cl,14 gethdr6: mov di,offset archdr.mbrsize gethdr7: call getc jc gethdrr1 stosb loop gethdr7 gethdr8: cmp archdr.mbrcode,1 ; old format? jne gethdr9 ; if so, it's short mov si,offset mbrsize mov di,offset mbrlen mov cx,4 rep movsb gethdr9: clc ret gethdrr2: printl 'Invalid archive header' jmp error gethdr endp subttl '--- i/o data areas' page arcv endp archdr db 64 dup (0) ; i/o area for a header inbuf db inbufsz dup (0) cseg ends end arcv