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Assembly Source File | 1993-01-27 | 46.4 KB | 1,898 lines

;ZDIR .ZIP directory utility ;From a disassembly and hack of ADIR.EXE ;v1.8 Update for PKZIP v2.04x ; - Added new "deflate" method. ; - Moved versions out to HISTORY.TXT ; - Removed earlier "v1.x" comments FALSE equ 0 TRUE equ NOT FALSE PLAIN equ 0 VERBO equ 0FFh MONOSYL equ 1 STRINGWILD Equ '*' ; wildcard for strings CHARWILD Equ '?' ; wildcard for single chars CR equ 0DH LF equ 0AH STDOUT equ 1 STDERR equ 2 ENDOFS equ 4096 ;enough for largest possible ;ZIP end directory structure. ;(to include XMODEM padding) ;(and hormongous comments!) ;(was 256 in v1.3) Print macro name ; display a field mov dx,offset name call PrintS endm ;PKZIP central directory structure: zdirEntry STRUC zsig1 db 50H,4BH,01H,02H ;central file header signature 4 bytes ;(0x02014b50) zVerMade dw ? ;version made by 2 bytes zVerExt dw ? ;version needed to extract 2 bytes zBitFlag dw ? ;general purpose bit flag 2 bytes zCmpMeth dw ? ;compression method 2 bytes zModTime dw ? ;last mod file time 2 bytes zModDate dw ? ;last mod file date 2 bytes zCrc32 dw ?,? ;crc-32 4 bytes zCmpSiz dw ?,? ;compressed size 4 bytes zUncmpSiz dw ?,? ;uncompressed size 4 bytes zNameLen dw ? ;filename length 2 bytes zExtraLen dw ? ;extra field length 2 bytes zFilCmtLen dw ? ;file comment length 2 bytes zDskNrPtr dw ? ;disk number start 2 bytes zIntAttr dw ? ;internal file attributes 2 bytes zExtAttr dw ?,? ;external file attributes 4 bytes zHdrOfs dw ?,? ;relative offset of local header 4 bytes zFilename db ? ;filename (variable size) ;extra field (variable size) ;file comment (variable size) zdirEntry ENDS ; End of central dir record: zdirEnd STRUC zEndSig db 50H,4BH,05H,06H ;end of central dir signature 4 bytes ;(0x06054b50) zDskNr dw ? ;number of this disk 2 bytes zDirDsk dw ? ;number of the disk with the ;start of the central directory 2 bytes zDskNrEntry dw ? ;total number of entries in ;the central dir on this disk 2 bytes zDirNrEntry dw ? ;total number of entries in ;the central dir 2 bytes zDirSiz dw ?,? ;size of the central directory 4 bytes zDirOfs dw ?,? ;offset of start of central ;directory with respect to ;the starting disk number 4 bytes zCmtLen dw ? ;zipfile comment length 2 bytes zCmt db ? ;zipfile comment (variable size) zdirEnd ENDS CSEG segment para public assume CS:CSEG,DS:CSEG org 5CH ;FCB #1 db ? ;drive val fcb1 db 10H dup(?) ;5DH, FCB #1 first char fcb2 db 10H dup(?) ;6DH, FCB #2 first char org 80H nchar db ? params db ? org 9EH ; We'll use the default PSP DTA, PSP_DTA_Name db ? ; and the file name found will be HERE. ;program entry point org 100H Zdir proc near jmp Start ;skip over runtime data usage db CR,LF,9,9, 'ZDIR version 1.8, 920124',CR,LF db 9,9,'David Kirschbaum, Toad Hall/mod GWS',CR,LF db 9,9, 'USAGE: ',9,'ZDIR zipname[.zip] [afn] [-v|-m]',CR,LF db 9,9,9,'zipname may be ambiguous (wildcarded)',CR,LF db 9,9,9,'afn = ambiguous member file name (like a*b)', CR,LF db 9,9,9,'-v = verbose display',CR,LF db 9,9,9,'-m = monosyllabic display',CR,LF USAGELEN equ $ - usage ziptyp db '.ZIP' ZIPTYPLEN equ $ - ziptyp msg1 db CR,LF, 9, 9, 9, ' ZIP file: ' MSG1LEN equ $ - msg1 msg2 db 'ZIP file not found',CR,LF MSG2LEN equ $ - msg2 msg3 db 'Central directory not found',CR,LF MSG3LEN equ $ - msg3 msg4 db 'ZIP is out of alignment or it''s not a ZIP' crlf db CR,LF MSG4LEN equ $ - msg4 CRLFLEN equ $ - crlf ;Keith Petersen suggested this oughtta go .. Sigh ... ;rivvvt db 'Rivvvvt',CR,LF ;RVTLEN equ $ - rivvvt handle dw 0 flag1 db LOW(TRUE) ;Find First flag verbose db PLAIN ;verbose display switch ;PLAIN, VERBO, or MONOSYLLABIC znameptr dw 0 ;point past ZIP target file path mnameptr dw 0 ;remember .zFilename start dirNrEntry dw 0 ;central directory file count dirctr dw 0 ;for counting down members pathflag db ' ' ;is set to '+' if member ; filename includes a path vhdrflag db FALSE ;set true when first member ;file is found Comment ~ Looks like: +filename.typ 000K / 000K +filename.typ 000K / 000K +filename.typ 000K / 000K Comment ends ~ blankline db ' . K / K . K / K ' db ' . K / K',CR,LF LINELEN equ $ - blankline ; Verbose display data ; display lines for verbose ; Adding a "E" (just before Stowage style) if encrypted vhdr db CR,LF db ' Name Length E Stowage SF Size now Date Time CRC' db CR,LF db ' ============ ======== = ======== ==== ======== ========= ====== ========' db CR,LF VHDRLEN equ $ - vhdr vline label byte ;db CR,LF vname db 15 dup (' ') vlength db 9 dup (' ') ; length in archive vencflag db 3 dup (' ') ;"E" if encrypted, else blank vstyle db 10 dup (' ') ; compression method (text) vfactor db ' xx% ' ; compression factor (percentage) 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 'xxxxxxxx' ; 32-bit crc in hex db CR,LF VLINELEN equ $ - vline ; final totals line vthdr db '*Total ' vtmbrs db 5 dup (' ') vtlen db 8 dup (' '),' ' db 12 dup (' ') vtsf db ' % ' vtsize db 8 dup (' ') db CR,LF ; for tom VTHDRLEN equ $ - vthdr ;Totals for each ZIP file's members: totcmp dw 0,0 ; total of file lengths totuncmp dw 0,0 ; total of file sizes totmbrs dw 0 ; total number of files TOTLEN equ $ - totcmp ;Totals for ALL ZIP files displayed: ttotcmp dw 0,0 ;total compressed file size ttotuncmp dw 0,0 ;total uncompressed file size ttotmbrs dw 0 ;total nr member files ; ZIP compression types: ;#define STORED 0 /* compression methods */ ;#define SHRUNK 1 ;#define REDUCED1 2 ;#define REDUCED2 3 ;#define REDUCED3 4 ;#define REDUCED4 5 ;#define IMPLODED 6 ;#define TOKENIZED 7 ;#define DEFLATED 8 ;#define NUM_METHODS 9 /* index of last method + 1 */ MAXSTYLES EQU 8 ;v1.8 zstyles label byte db ' Stored' ;0 - The file is stored (no compression) db ' Shrunk' ;1 - The file is Shrunk db 'Reduced1' ;2 - Reduced with compression factor 1 db 'Reduced2' ;3 - Reduced with " " 2 db 'Reduced3' ;4 - Reduced with " " 3 db 'Reduced4' ;5 - Reduced with " " 4 db 'Imploded' ;6 - The file is imploded db 'Tokenize' ;7 - The file is "tokenized" v1.8 db 'Deflated' ;8 - The file is Deflated v1.8 db ' Unknown' ;illegal or unknown value months db 'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ' ; translation table for upper-casing national chars: UpperSet Db 'ÄÖÜÇÅÉÆÑ' ; upper case national chars LowerSet Db 'äöüçåéæñ' ; lower case national chars Zdir endp Start proc near call Parse_CmdLine ;parse cmdline for ;target filenames jb Jmp_Msg_Term ;failed ;Let's get to work call Find_Zip jnc ZipLup_73 ;found the first one mov dx,offset msg2 ;'Zipfile not found' mov cx,MSG2LEN Jmp_Msg_Term: jmp Msg_Term ;display, terminate ZipLup_73: call Read_CentralDir ;try to read in file trailer jnb Got_Dir ;found it, DS:BX -> directory mov dx,offset msg3 ;'No central directory' mov cx,MSG3LEN jmp short Next1 ;right to next ZIP file Got_Dir: ; We'll only show our verbose header line ; when and if we find our first member file. ; (Down in Show_FileData) cmp verbose,MONOSYL ;mode switch ja MemberLup ;verbose, no init jb GD_InitLine ;plain, use standard mov di,offset blankline ;if monosyllabic, blank mov al,' ' ; that blankline for mov cx,LINELEN-2 ; good rep stosb GD_InitLine: call Refresh_LineBuff ;Init formatted display line MemberLup: cmp word ptr [bx],4B50H ;signature? jnz Bad_Dir ;nope, bogus cmp word ptr 2[bx],0201H ;normal entry? jnz Bad_Dir ;nope, bogus ;Normal directory entry. Display it. call Show_FileData ;display entry info dec dirctr ;decr nr entries jz Next_Zip ;last entry jmp MemberLup ;next member Bad_Dir: mov dx,offset msg4 ;'ZIP is out of alignment' mov cx,MSG4LEN ; or not a .ZIP file' call Pr_StdOut ;display msg Next_Zip: mov dx,offset crlf ;need a new line mov cx,CRLFLEN ;length cmp verbose,VERBO ;verbose mode? jz Show_Verbose_Totals ;yep, maybe display totals mov ax,offset linebuff ;formatted line start cmp di,ax ;got any file entries? jz Next1 ;nope dec di ;back up over the two spaces dec di ; from the last file size mov dx,ax ;DX'll need it for display mov cx,ax ;CX will be nr chars mov ax,0A0DH ;CR/LF stosw ;stuff stosw ;2 CR/LFs xchg cx,di ;CX = end, DI = start sub cx,di ;end - start = length jmp short Next1 ;Verbose mode Show_Verbose_Totals: cmp totmbrs,0 ;any totals? jz Next1 ;nope call Format_Totals ;yep, format ;CX,DX prepared for ... ; If just 1 member, there won't BE a total display! ; BP returns from Format_Totals with 0 (1 file) or 1 (more than ; 1 file) or bp,bp ;just 1 file? jz Next2 ;yep, no totals Next1: call Pr_StdOut ;display line seg or CR/LF Next2: call Find_Zip ;next .ZIP file jnc ZipLup_73 ;found it, loop xor ax,ax ;handy 0/FALSE cmp al,verbose ;nonverbose mode? jle NoMsg_Term ;nonverbose, terminate ;(errorlevel 0) ; We've been accumulating overall totals. ; Now display them. Gotta move the total totals ; into the totals (where Format_Totals expects them). ; If we never displayed our verbose header line, ; we never found a qualifying member file! ; Ergo .. no totals .. cmp vhdrflag,al ;FALSE ;no header line? jz NoMsg_Term ;no hdr, so no totals mov ax,ttotmbrs ;accumulated total mbrs cmp ax,dirNrEntry ;just the one ZIP? jz No_More ;yep, forget total totals cmp ax,1 ;<= 1? jbe No_More ;yep, forget the total totals mov si,offset ttotcmp ;move total totals mov di,offset totcmp ;into totals mov cx,TOTLEN SHR 1 ;nr words rep movsw call Pr_CrLf ;down extra line call Format_Totals ;format overall totals call Pr_StdOut ;display them No_More: ; Keith Petersen suggested this oughtta go .. Sigh .. ; mov dx,offset rivvvt ; mov cx,RVTLEN ;fall thru to... xor ax,ax ;ERRORLEVEL 0 jmp short NoMsg_Term Msg_Term: push ax ;save errorlevel call Pr_StdOut ;display error msg pop ax NoMsg_Term: mov ah,4Ch ;terminate, AL = ERRORLEVEL int 21h Start endp ;SUBROUTINE Find_Zip proc near ;We reset our DTA to the default PSP DTA each time through. ;The actual ZIP file open uses another one. mov dx,80H ;use PSP DTA mov ah,1AH ;set DTA int 21h ;v1.7a new code mov ah,4FH ;assume not first time thru ;think how many bytes, ; machine cycles THIS saved! cmp flag1,0FFh ;first time thru? jne Find_Done ;nope ;First time through not flag1 ;set to NOT first time thru mov dx,offset ziptarget ;DS:DX -> zip target name xor cx,cx ;read-only dec ah ;4EH ;find first Find_Done: int 21h ;hah - two bytes saved! jb FindZ_X ;failed, return CF set ;v1.7a new code ends Comment ~ introduced in v1.7 Once DOS has found a file, we could apply our own matching on top (DOS will maybe find MORE than we like, but never LESS). Basically, that's another 'call MatchW'; remember to 'CLC' before returning, so that we will be called again. - Just one problem: We need our old name, as used to be in ziptarget; but that has now been overwritten with the previous matching file name. So we'd need to keep the old name somewhere... Too lazy to do it now. End of comment v1.7 ~ call Move_FileName ;move name in after path ;to create full name for open ;Found target file. Announce, set new DTA, open it. mov dx,offset msg1 ;'Zip file: ' mov cx,MSG1LEN call Pr_StdOut Print ziptarget ;'filename.zip' call Pr_CrLf ;new line ;We need a new DTA for the file open/read so we don't blow away ;the find first/find next stuff in the PSP DTA. mov dx,offset dta1BA ;DS:DX -> new DTA mov ah,1Ah ;set DTA int 21h mov dx,offset ziptarget ;DS:dx -> filename buffer mov ax,3D00H ;open file, read only int 21h mov handle,ax ;save handle FindZ_X: ret Find_Zip endp Move_FileName proc near mov si,offset PSP_DTA_Name ;FCB #1 +1 mov di,znameptr ;pointer to after path mov cx,6 ;first 12 bytes rep movsw movsb ;13th byte ret Move_FileName endp ;Reads in file tailer. ;Then scans for the unique central directory signature. ;On success: ; DS:BX -> central directory structure ; readlen = nr bytes actually read ; CF clear ;Else CF set for failure Read_CentralDir proc near xor cx,cx ;CX:DX = offset from end xor dx,dx ;to very end mov bx,handle ;file handle mov ax,4202H ;move file pointer to end int 21H ;gets file size in DX:AX jb RCD_Close ;seek failed ; Increased ENDOFS to read in more of the ZIP file's tail. ; Original value wasn't enough to allow for huge comments. sub ax,ENDOFS ;back up psn.lo jnb Read1 ;ok, no problem sub dx,1 ;got a borrow, decr psn.hi jnb Read1 ;no problem xor ax,ax ;sigh .. small file .. xor dx,dx ; .. back to very start Read1: mov cx,dx ;psn.hi mov dx,ax ;psn.lo mov ax,4200H ;now move from start int 21H ;CX:DX point to offset from end ;(big) or to start (small) jb RCD_Close ;failed, close up mov cx,ENDOFS ;try to read this much mov dx,offset dirbuff ;into our directory buffer mov di,dx ;DI'll need it in a second mov ah,3FH ;read from file/device int 21H ;AX=bytes read jb RCD_Close ;failed, close up ;First scan the end structure to locate the central directory. call Sig_Scan ;find the structure start ;(using bytes read in AX) jb RCD_InvalidDir ;failed, close and exit ;ES:DI -> end structure start (the signature) ;While we have the end structure, let's pick up and display ;any ZIP file comment. mov cx,[di].zCmtLen ;comment length jcxz RCD_NoComment ;nope, forget it lea dx,[di].zCmt ;DS:DX -> comment call Pr_StdOut ;display it. call Pr_CrLf ;and a new line RCD_NoComment: ; Pick up the central directory file pointer (long integer): ; It's a pointer directly to the central directory start. ; This will only work for single-disk ZIP files. mov si,[di].zDirSiz ;save central directory size mov ax,[di].zDirNrEntry ;nr central dir entries mov dirNrEntry,ax ;save it for later mov dirctr,ax ;two places mov dx,[di].zDirOfs ;central directory offset.lo mov cx,[di].zDirOfs[2] ;offset.hi mov ax,4200H ;move file ptrs from start int 21H jb RCD_Close ;seek failed, close and exit mov cx,si ;read central dir size bytes mov dx,offset dirbuff ;into our directory buffer mov ah,3FH ;read from file/device int 21H jb RCD_Close ;failed, forget it mov di,dx ;DI -> dir start xor ax,ax ;return AX=0 for ok cmp word ptr [di],4B50H ;is it a signature? jnz RCD_InvalidDir ;nope cmp word ptr 2[di],0201H ;is it a file entry sig? jz RCD_Close ;yep, good to go, CF clear RCD_InvalidDir: mov al,11 ;Invalid format stc ;insure CF set, AL=error RCD_Close: mov dx,ax ;save error value (if any) pushf ;save flags mov ah,3EH ;close file int 21H ;(BX = file handle) popf ;restore orig flags mov ax,dx ;and any error value mov bx,di ;if it went well, ;DS:BX -> central dir struc ret ; Subroutine for Read_CentralDir ; Scans backwards through buffer for a directory end signature. ; Enter with: ; SI = second two signature bytes ; DX -> buffer start ; AX = bytes read ;We must scan at the byte level (since a member or directory entry ;can be ANY length). Sig_Scan: mov di,dx ;ES:DI -> dirbuff ;(now a ZIP end dir structure) add di,ax ;+ bytes read = -> buff end mov cx,ax ;bytes read for the scan inc cx ;debug for MAX size inc cx mov ax,4B50H ;scan for first signature char ;(same for all structures) mov si,0605H ;2d 2 chars of a directory ;end structure signature std ;scan from end to start SS_Lup: repne scasb ;ES:DI -> read buffer jnz No_Sig ;not found jcxz No_Sig ;scanned it all ;ES:DI -> the byte BEFORE the 50H signature cmp 2[di],ah ;2d signature byte? jnz SS_Lup ;nope, keep searching cmp 3[di],si ;last 2 signature bytes? jnz SS_Lup ;nope, keep searching inc di ;bump from that last scasb ;DS:DI -> dir structure cld ;forwards again to be neat clc ;CF clear for success ret No_Sig: cld ;forward again to be neat stc ;return CF set for failure ret Read_CentralDir endp ;SUBROUTINE ;1 call Show_FileData proc near ;Added tests for cmdline member name testing call Member_Test ;see if file is eligible jnz SF_NextRec ;nope, forget it push bx xor ax,ax ;FALSE cmp al,verbose ;not verbose? jle SFD_NonVerbose ;not verbose ;Verbose mode cmp vhdrflag,al ;FALSE ;verbose hdr displayed? jnz SFD_HdrDone ;yep not vhdrflag ;set to TRUE mov dx,offset vhdr ;display verbose header mov cx,VHDRLEN call Pr_StdOut SFD_HdrDone: call Show_Verbose ;show verbose member display jmp short SFD_BumpPtrs ;skip nonverbose stuff ;Nonverbose mode SFD_NonVerbose: call Stuff_FileName ;parse, pad at ES:DI cmp verbose,MONOSYL ;monosyllabic output? je SFD_FlushLine ;shove it out lea si,[bx].zCmpSiz ;compressed size (long int) call Stuff_FileSize ;to ES:DI lea si,[bx].zUncmpSiz ;uncompressed size inc di ;adjust line ptr call Stuff_FileSize ;stuff uncompressed size ; to ES:DI cmp di,offset linebuff + LINELEN ;hit end? jb SFD_BumpPtrs ;nope SFD_FlushLine: mov dx,offset linebuff ;display the line mov cx,LINELEN ;length call Pr_StdOut ;display it call Refresh_LineBuff ;refresh dynamic variable SFD_BumpPtrs: pop bx SF_NextRec: ;Now bump our BX pointer to the next entry lea ax,[bx].zFilename ;from filename start add ax,[bx].zNameLen ;add in name field length add ax,[bx].zExtraLen ;and extra field length add ax,[bx].zFilCmtLen ;and file comment field length mov bx,ax ;should be next record ret Show_FileData endp ;Tests to see if THIS file is eligible (e.g., meets the ambiguous ;filename entered on cmdline at startup). ; If no such parm, accept it (return CF clear). ; If it matches, return CF clear. ; If no match, return CF set. ;While we're here, let's Asciify that stupid ZIP directory file name ;for later tests. Member_Test proc near mov cx,[bx].zNameLen ;name length jcxz MT_Fail1 ;zero .. flunk it! push di ;save formatted line pointer lea si,[bx].zFilename ;dirEntry filename mov di,si ;start dec di ;back it up one mov ax,di ;remember new start mov dx,cx ;save length rep movsb ;move it left 1 char ;(make room for AsciiZ 0) mov byte ptr [di],0 ;AsciiZ the name mov cx,dx ;restore count/length mov si,ax ;new start (1 char to left) mov dx,ax ;remember in DX mov mnameptr,ax ;assume no paths cmp byte ptr 1[si],':' ;a drive separator? jnz MT_NoDrive ;nope mov ax,2 add si,ax ;bump past d: sub cx,ax ;adjust length counter jbe MT_Fail ;zeroed out, flunk it! MT_NoDrive: ;Check for directory slashes mov di,si ;starting point ;PKZIP uses the '/' character for paths! ; Wonder why GWS is loading the entire AX? ; We're only doing a SCASB for the slash! ; Aha! Because of that je MT01 below .. tricky, tricky... mov ax,' /' ;scan for PKZIP ; directory slashes MT_SlashScan: repne scasb jnz MT_NoSlash ;none jcxz MT_Fail ;zeroed out, flunk it! mov si,di ;new starting point mov byte ptr [di-1], '\' ;old habits never die jmp MT_SlashScan ;and try again until all gone MT_NoSlash: ;SI now points at first filename char. cmp verbose,MONOSYL ;are we monosyllabic? je MT_01 ;yes,remember full path mov mnameptr,si ;remember the new address ; We'll set a global flag if there was a path. ; Simpler than testing if mnameptr = filename start ; in both verbose and nonverbose display modes. ; DX -> shifted .zFilename ; SI -> filename first char mov ax,'+ ' ;assume yes (no paths) ;(AL=' ',AH='+') cmp dx,si ;name^ = zFileName^? jz MT_1 ;yep, no path MT_01: ;if monosyl, use ' '! mov al,ah ;'+' ;set the path flag MT_1: mov pathflag,al ;post path flag cmp byte ptr pname1,0 ;empty member name? jz MT_Done ;empty, forget the compares mov di, si mov si, offset pname1 call MatchW pop di ret MT_Fail: ;no match pop di ;restore formatted line ptr MT_Fail1: mov al,1 ;return ZF clear MT_X: ret MT_Done: pop di xor al,al ;return ZF set for success ret Member_Test endp ; The following routine introduced in v1.7: MatchW Proc Near ; This function checks if a given string matches a given pattern ; including generalized wildcards, e.g., 'a*b?c'. The matching is ; case-sensitive. The result is returned in the flags: ; ZF set = exact match (check with JZ ExactMatch) ; CF set = no match ( JB NoMatch) ; CF clear, ZF clear = prefix match ( JA PartialMatch) ; (or JAE PartialOrExact) ; ; Hand-assembly from a Fortran routine by Gunter Rademacher ; ; Input ; si - pointer to pattern, ASCIIZ ; di - pointer to string, ASCIIZ ; Output ; carry and zero flags (cf. above) ; Registers modified ; ax, cx, si, di ; Let's use BX and DX (saving them on the stack just in case ; they need to be preserved) instead of the variables saveSI and saveDI. ; Gain speed, reduce size. push bx ;preserve push dx mov dx,di ;save DI a sec xor ax,ax ;clear lsb and msb ;(to find end of AsciiZ ; string, later as flag) ; Bad assumption here: What is CX prior to this REPNE SCASB? ; Donno .. so we'd better make sure it's big, ne? ; I can live with assuming we're already CLD'ed (forward) ; I also don't see where saveSI was ever initialized! ; I can only assume pattern start (since I don't quite have the ; logic of this sucker figured out yet!). mov bx,si ;initialize saveSI mov cx,0FFFFH ;max number Repne Scasb Dec di Dec di xchg di,dx ;DI restored (first char) ;DX=pointer to last char ; AH is already 0 (possible return code) Xor cx, cx ; wildcard pointer GetPat: Lodsb ; get char from pattern Or al, al Jz ChkMore ; branch if end of pattern Cmp al, STRINGWILD ;'*' Je SaveStar ; branch if string wildcard Cmp Byte Ptr [di], 0 Je MatchWr ; branch if at end of string Scasb ; branch if pattern char matches Je GetPat ; string wildcard Cmp Al, CHARWILD ;'?' Je GetPat ; ... or if char wildcard MatchAny: Dec cx inc dx ; restore last psn for mov di,dx ; string wildcard + 1 Cmp Byte Ptr [di], 0 Je MatchWr mov si,bx ; restore corresponding ; pattern Jmp Short GetPat ; ... position and loop SaveStar: Cmp Byte Ptr [si], 0 Jz Found ; branch if end of pattern Mov cx, 1 ; mark this fact mov dx,di ;save pointer to string mov bx,si ;and pointer to pattern Jmp Short GetPat ; and loop ChkMore: Mov ah, 2 ; at least substring match Cmp Byte Ptr [di], 0 Jne MatchAny ; loop if not at end of string Found: Mov ah, 1 ; true match! MatchWr: Sub ah, 1 ; done; set up flags pop dx ;restore pop bx Ret MatchW EndP ; End of routine introduced in ;ES:DI -> next position on formatted line ;zFilename is now AsciiZed ;mnameptr contains ptr to original or real zFilename start ;(paths stripped) Stuff_FileName proc near push di ;save formatted line ptr ; Now using pathflag if target filename has a path mov al,pathflag ;' ' if no paths, ;'+' if paths mov si,mnameptr ;ptr to filename start stosb ;stuff space or '+' mov dx,di ;name start add dx,8 ;bump to the dot SN_Lup: lodsb or al,al ;hit AsciiZ 0 yet? jz SN_Done ;yep cmp verbose,MONOSYL ;monosyllabic? je SN_NoDot ;ay,don't mess with '.' cmp al,'.' ;.typ separator? jnz SN_NoDot ;nope cmp di,dx ;where the dot should go? jz SN_NoDot ;yep, put it there mov di,dx ; bump to the dot psn SN_NoDot: stosb ;stuff in formatted line jmp SN_Lup SN_Done: pop di ;orig ptr add di,14 ;bump to size psn ret Stuff_FileName endp ;SUBROUTINE ;2 calls Stuff_FileSize proc near push bx ;Preserve BX! (dta ptr) add di,3 ;move to number string end push di ;save it (ptr to last digit) mov ax,[si] mov dx,[si+2] add ax,3FFh ;div 1024 to get Kb adc dx,0 mov cl,0Ah shr ax,cl mov cl,6 shl dx,cl add ax,dx mov si,0Ah SFS_Lup: xor dx,dx div si add dl,30H ;asciify dec di ;back up the digit pointer mov [di],dl ;stuff digit in buffer or ax,ax ;number done? jnz SFS_Lup ;nope pop di ;restore line buffer ptr add di,3 ;bump past ' / ' or ' | ' pop bx ret Stuff_FileSize endp ;Verbose display functions ;Format, display single line for each member ;On success, return: ; CF clear ; AL = 0 ;On error, return: ; CF set (because of output write fail) ; AL = error code ;Preserve BX (buffer ptr) ; Right before the compression style: ; "E" if encrypted ; Else blank ; Forgot to show our possible "extended" filename with path ; (via a "+" preceding the stripped filename). ; Worked fine for nonverbose mode, now adding for verbose mode. sign db ' ' ;local variable hundred dw 100 ; for computing percentages Show_Verbose proc near mov si,mnameptr ;move real member name ;(no paths) mov di,offset vname ;into formatted line mov al,pathflag ;' ' if no paths, ;'+' if paths stosb ;stuff '+' mov cx,13 ;14 spaces in field ; minus the path flag ; already stuffed SV_Lup: lodsb ;snarf char or al,al ;AsciiZ ending? jz SV_5 ;yep stosb loop SV_Lup SV_5: ; I don't see where we EVER loaded AH with a space! ; Must have lost it in one of the hacks. ; Replacing it again. mov al,20H rep stosb ;pad with spaces ; reduce the size/length to word values mov si,[bx].zUncmpSiz ; get uncompressed file size mov ax,[bx].zUncmpSiz[2] mov cx,[bx].zCmpSiz ;compressed size mov dx,[bx].zCmpSiz[2] SVL_51: or ax,ax ; big number? jz SV_52 ; nope, can use it shr ax,1 ; yup, divide by two rcr si,1 shr dx,1 rcr cx,1 jmp SVL_51 ;loop SV_52: mov ax,si ; low word of actual size mov sign,' ' cmp ax,cx ; arc member is larger? jb SV_520 sub ax,cx ; amount saved jmp short SV_521 SV_520: sub ax,cx neg ax mov sign,'-' SV_521: mul hundred ; to percentage add ax,50 ; I'm thinking PK isn't doing this rounding .. ; our percentage figures are sometimes 1% off the PKZIP -v display. ; Close enough for govt work... adc dx,0 ; round up percent or si,si ; empty file? jnz SV_53 mov ax,100 jmp short SV_54 SV_53: div si SV_54: cmp ax,100 ; archive fouled? jbe SV_55 sub ax,ax SV_55: mov di,offset vfactor-2 ;format stowage factor call Asciify ;display AX mov al,sign mov vfactor,al ; If encrypted, stuff an 'E', else a blank mov di,offset vencflag ;space for "E", space mov ax,' E' ;assume unencrypted ;(AL='E',AH=' ') test byte ptr [bx].zBitFlag,1 ;If 0 bit is set, jnz SV_56 ;it's encrypted mov al,ah ;' ' ;blank (not encrypted) SV_56: stosw ;stuff 'E' or space, ;trailing space ;DI -> vstyle field ; Adding test to insure compression method (0..6) is in legal range ; (e.g., doesn't overrun our compression style table) mov si,offset zstyles ;style table start xor ax,ax ;clear msb or ax,[bx].zCmpMeth ;bring in method ; of compression jz SV_58 ;0 -> use table base ;v1.8 cmp al,6 ;max legal cmp al,MAXSTYLES ;max legal v1.8 jbe SV_57 ;it's legal ;v1.8 mov al,7 ;' Unknown' mov al,MAXSTYLES+1 ;' Unknown' v1.8 SV_57: mov cl,3 ; eight bytes each entry shl ax,cl SV_58: add si,ax ;table base + offset ;DI already points to vstyle mov cx,4 ;move as words (8 bytes) rep movsw mov dx,[bx].zCmpSiz[2] ;compressed size.hi mov ax,[bx].zCmpSiz ;compressed size add totuncmp,ax ;accumulate adc totuncmp[2],dx mov di,offset vsize ;format file size call Asciify_Long mov dx,[bx].zUncmpSiz[2] ;uncompressed size.hi mov ax,[bx].zUncmpSiz ;uncompressed size.lo add totcmp,ax ;accumulate adc totcmp[2],dx mov di,offset vlength ;format file length call Asciify_Long mov ax,[bx].zModDate ; format file date call GetDate mov ax,[bx].zModTime ; format file time call GetTime mov ax,[bx].zCrc32 ; format crc.lo in hex mov di,offset vcrc + 4 call Cvh mov ax,[bx].zCrc32[2] ; format crc.hi in hex mov di,offset vcrc call Cvh inc totmbrs ;bump total file count mov dx,offset vline ;display formatted info mov cx,VLINELEN call Pr_StdOut ret Show_Verbose endp ;Formats, displays verbose totals Format_Totals proc near mov ax,totmbrs ;total members add ttotmbrs,ax ;accumulate ; Don't display totals for this ZIP file's members ; unless there's more than 1. xor bp,bp ;use BP for a flag ;(undisturbed by Asciify) ;(0 = only 1 file) cmp ax,1 ;just one? jbe FT_1 ;yep, no Asciify inc bp ;flag more than 1 file mov di,offset vtmbrs-2 ;format total members call Asciify FT_1: mov dx,totcmp[2] ;total compressed file size mov ax,totcmp add ttotcmp,ax ;accumulate total totals adc ttotcmp[2],dx or bp,bp ;just 1 file? jz FT_2 ;yep, no Asciify mov di,offset vtlen ;format total compressed file ;size call Asciify_Long FT_2: mov dx,totuncmp[2] ; total uncompressed file size mov ax,totuncmp add ttotuncmp,ax ;accumulate total totals adc ttotuncmp[2],dx or bp,bp ;just 1 file? jz FT_9 ;yep, no Asciify ;no fancy computations mov di,offset vtsize ;format total uncompressed ;file size call Asciify_Long ; reduce the total size/length to word values mov si,totcmp ; get compressed file size mov ax,totcmp[2] mov cx,totuncmp ; uncompressed file size mov dx,totuncmp[2] FTDiv: or ax,ax ; big number? jz FT_4 ; nope, can use it shr ax,1 ; yup, divide by two rcr si,1 shr dx,1 rcr cx,1 jmp short FTDiv FT_4: mov ax,si mov sign,' ' ;whata kludge cmp ax,cx ;compressed > uncompressed? jb FT_5 ;yep sub ax,cx ;amount saved jmp short FT_6 FT_5: sub ax,cx neg ax mov sign,'-' FT_6: mul hundred ; to percentage add ax,50 adc dx,0 ; round up percent or si,si ; empty file? jnz FT_7 mov ax,100 jmp short FT_8 FT_7: div si FT_8: mov di,offset vtsf-2 ;format stowage factor call Asciify ;AX mov al,sign mov vtsf,al FT_9: mov di,offset totcmp ;starting at totcmp mov cx,TOTLEN/2 ;length of totals to clear ; (words) xor ax,ax ;handy 0 rep stosw or bp,bp ;just 1 file? jz FT_X ;yep, exit mov dx,offset vthdr ;prepare to display totals mov cx,VTHDRLEN ;msg length FT_X: ret ;to display Format_Totals endp ; format the time (in AX) 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 (in AX) 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 bx ;preserve BX (buff ptr) 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 di,offset vmonth movsw ;2 bytes movsb ;the 3rd 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 pop bx ;restore buff ptr GotDate:ret GetDate endp ;A severely hacked single/double precision number conversion function. ;Originally from JMODEM, but severely hacked by Toad Hall. ;ES:DI -> string ;Destroys everything almost. ;Enter here if integer in AX Asciify proc near push bx ;save buff ptr xor dx,dx ; clear fake long.hi mov si,ax ;move integer into SI xor ah,ah ;clear msb (flag) jmp short Ascii_Ax ;jump into the code ;Enter here if long integer in DX:AX. Asciify_Long: push bx ;save buff ptr mov si,ax ;move long.lo into SI xor ah,ah ;clear msb (flag) Comment ~ Taking out the extremely high numbers to reduce column width. MOV CX,3B9AH ; Get billions MOV BX,0CA00H CALL Subtr ; Subtract them out MOV CX,05F5H ; Get hundred-millions MOV BX,0E100H CALL Subtr ; Subtract them out Comment ends ~ and dx,4FFH ;seems likely MOV CX,0098H ; Get ten-millions MOV BX,9680H CALL Subtr ; Subtract them out MOV CX,000FH ; Get millions MOV BX,4240H CALL Subtr ; Subtract them out MOV CX,1 ; Get hundred-thousands MOV BX,86A0H CALL Subtr ; Subtract them out Ascii_Ax: xor cx,cx ; Get ten-thousands MOV BX,2710H CALL Subtr ; Subtract them out MOV BX,03E8H CALL Subtr ; Subtract them out MOV BX,0064H CALL Subtr ; Subtract them out MOV BX,10 CALL Subtr ; Subtract them out mov ax,si ;residual in SI add AL,'0' ; Add bias to residual stosb ; Put in the string pop bx ;restore buff ptr RET ;Common subroutine for Asciify Subtr: mov al,'0'-1 Subtr1: INC al ; Bump the digit character SUB si,BX ; Dword subtraction SBB DX,CX JNB Subtr1 ; Continue until a carry ADD si,BX ; One too many, add back ADC DX,CX ; and the remainder cmp al,'0' jnz Subtr2 ;nope, turn off leading flag, ; stuff or ah,ah ;no more leading spaces? jnz Sub_Stuff ;right, stuff the '0' mov al,' ' ;make it neat ; with leading spaces Sub_Stuff: stosb ;stuff the char RET Subtr2: inc ah ;turn off leading space flag stosb ret Asciify ENDP ;Convert 16-bit binary word in AX ;to hex ASCII string at ES:DI ;(Protect BX, directory array pointer) hexchar db '0123456789ABCDEF' Cvh proc near push bx ;save buff ptr mov si,offset hexchar ;for faster access mov dx,ax ; save 16-bits mov bl,dh ; third nibble xor bh,bh ;clear msb mov cx,0F04H ;CL=4 for shifting, ;CH=0FH for masking shr bl,cl mov al,[si][bx] ;snarf hex char stosb mov bl,dh ; last nibble and bl,ch ;0fh mov al,[si][bx] ;snarf hex char stosb mov bl,dl ; first nibble shr bl,cl ; isolate (CL still 4) mov al,[si][bx] ;snarf hex char stosb mov bl,dl ; second nibble and bl,ch ;0fh ; isolate mov al,[si][bx] ;snarf hex char stosb pop bx ;restore buff ptr ret Cvh endp ;SUBROUTINE Pr_CrLf proc near mov dx,offset crlf mov cx,CRLFLEN ;fall through to ... Pr_CrLf endp Pr_StdOut proc near push bx ;preserve bx mov bx,STDOUT mov ah,40H ;write int 21H pop bx ret Pr_StdOut endp ;Print null-terminated (AsciiZ) string like int 21h function 9 ;Enter with DS:DX -> AsciiZ string ;Destroys AX ;On success, return: ; CF clear ; AL = 0 ;On failure (StdOut write fail), return: ; CF set ; AL = error PrintS proc near mov cx,0FFFFH ;max scan xor al,al ;handy 0 mov di,dx ;string start repne scasb ;find the terminator inc cx ;adjust not cx ;CX=length call Pr_StdOut ;display to StdOut ret PrintS endp ;Reinit our nonverbose formatted display line ;Returne ES:DI -> formatted line start Refresh_LineBuff proc near mov si,offset blankline ;formatted display line mov ax,offset linebuff ;dynamic data area mov di,ax ;move to ... mov cx,LINELEN ;length rep movsb mov di,ax ;ES:DI -> formatted line start ret Refresh_LineBuff endp ;Parses cmdline for target files. ;If failure: ; Returns CF set, ; AL = ERRORLEVEL, ; DX -> error msg ;Adding command line switch ('-v') parsing. ;And '-m', too. Also accept '/' as switch char. ;And fixing the bug. Parse_CmdLine proc near call _Args ;parse cmdline ;returns AX = argc or ax,ax ;any argc? jnz Got_Parm ;yep Cmd_Err: mov dx,offset usage ;intro, usage mov cx,USAGELEN ;total length mov al,1 ;errorlevel 1 stc ;CF set ret ;for a jmp to Msg_Term Got_Parm: mov cx,ax ;argc ;See if any of the argv's are our '-v' verbose switch. ;Or '-m'. Or '/v'. Or '/m'. Or. Or. Or. ;If so, turn switch on, clear that argv. cmp cx,1 ;just 1 arg? jz Chk_ZipName ;yep, can't be any switches mov bx,offset argv[2] ;start with ^argv(1) Chk_VSwitch: mov si,[bx] ;argv^(1) cmp byte ptr 2[si],0 ;arg longer than 2 chars? jnz Chk_VRelup ;yes, can't be switch mov ax,[si] ;snarf possible -V parm cmp al,'-' ;is first(!) char '-'? je Found_Some_Switch ;yes, check which cmp al,'/' ;is first(!) char '/'? jne Chk_VRelup ;no, cant' be switch Found_Some_Switch: ; We KNOW the args are upper case, because we made them so! mov al,VERBO ;assume it's 'v' cmp ah,'V' ;'V'? jz Found_Switch ;yep cmp ah,'M' ;'M'? jnz Chk_VRelup ;nope mov al,MONOSYL ;hah-it's monosyllabic Found_Switch: cmp byte ptr 2[si],0 ;Just the '-v'? jnz Chk_VRelup ;nope, must be a name mov verbose,al ;got switch,set verbose mov byte ptr [si],0 ;clear this argv cmp cx,argc ;first argc? jnz Chk_V_NoShift ;nope inc argc ; .. sigh .. readjust call _Shift ;yep, move other args down one ;(will decr argc again) Chk_V_NoShift: dec argc ;final decr to eliminate it jmp short Chk_ZipName ;done Chk_VRelup: add bx,2 ;next argv^ loop Chk_VSwitch ;check all args ;If argv(1) was the '-v' switch, ;or that other one, ;that argv has been cleared via the _Shift call. ;The target zip file name HAS to be argv(1)! Chk_ZipName: mov cx,argc ;argc arg counter jcxz Cmd_Err ;he only had a switch! mov bx,offset argv[2] ;^argv(1) mov si,[bx] ;argv^(argc) call Parse_MoveZipName ;handle the zip name call _Shift ;move argv's down one ;Check for member testing (2d or 3d argv). ;We make the call even if argc = 0 (to clear a buffer) Chk_MbrName: mov di,offset pname1 mov byte ptr [di], 0 ;initialize mbr name mov cx,argc ;argc counter jcxz Parse_Done ;all done, no member mov bx,offset argv[2] ;it's now ^argv(2) mov si,[bx] ;argv^(argc) Chk_MbrCopy: ;copy name to safe place lodsb stosb or al, al ;at end? jnz Chk_MbrCopy ;loop if not Parse_Done: clc ret Parse_CmdLine endp ;Cmdline parsing subroutine ;Moves argv into our targetfile buffer, ;picks up a pointer to past the paths (if any) ;SI -> argv Parse_MoveZipName proc near push si ;save SI mov bx,offset ziptarget ;full zip target filename mov di,bx mov cx,64 ;clear ziptarget xor ax,ax rep stosw mov di,bx ;DI -> ziptarget Move_ZipName: lodsb ;snarf cmdline char or al,al ;AsciiZ terminator? jz Skip_Zip_Path ;yep stosb ;stuff jmp Move_ZipName Skip_Zip_Path: ;DI -> last ziptarget's real char +1 mov dx,di ;end, last char +1 sub dx,bx ;end - start = length dec di ;adjust from last movsb std ;backwards mov si,di ;SI -> ziptarget last char ;BX = ziptarget start ;SI -> ziptarget lastchar ;DX = ziptarget length ;DI -> ziptarget lastchar ;Now find any path separators in ziptarget mov cx,dx ;scan length mov al,'\' ;subdir dividers repne scasb ;scan till we hit one jz Zip_GotPath ;DI -> char before the '\' mov di,si ;back to last char mov cx,dx ;scan length mov al,':' ;how about just drive? repne scasb jnz Zip_NoPath ;nope, DI -> ziptarget-1 ;skip the extra inc Zip_GotPath: inc di ;bump to '\' or ':' Zip_NoPath: inc di ;and past it to filename's char cld ;forward again mov znameptr,di ;points to start of ;true filename (beyond path) ;for later appending Find Next ;filenames to path ;append type of .ZIP, if not specified. Moved here from above in mov dx,si ;end of file name mov cx,dx sub cx,di ;end - start = length inc cx ;well, nearly... mov al,'.' repne scasb ;find a .TYP separator ;DI -> char after '.' or actual filename end jz PZN_Exit ;leave .TYP alone! mov si,offset ziptyp ;assume need full '.ZIP' movsw ;copy .ZIP in movsw ;(4 chars) PZN_Exit: pop si ;restore ret Parse_MoveZipName endp Capitalize Proc Near ; This routine takes a pointer to an ASCIIZ string and uppercases the ; latter in place, taking national characters into account ; Input ; si - pointer to string ; Registers modified ; ax, cx, di, si ; National characters .. Gad! Sure do appreciate ; the European outlook .. we provincial New World types ... Inc si mov ah,20H ;handy constant CNextChar: Lodsb ; get next char of string Or al, al Jz CExit ; branch if at end of string Cmp al, 'a' Jb CNextChar ; skip this char if below 'a' Cmp al, 'z' ; if above 'z', then... Ja CUpperHalf ; ...test for national chars Sub al,ah ; 20h ; otherwise make upper case Jmp Short CPutChar ; branch for replacement CUpperHalf: mov cx, LowerSet-UpperSet ; number of national chars mov di, offset LowerSet ; pointer to lower case letters repne scasb ; try to find jne CNextChar ; loop if not found mov al, [di+UpperSet-LowerSet-1] ; otherwise replace CPutChar: Mov byte ptr [si-1], al ; store back Jmp Short CNextChar ; and loop CExit: Ret Capitalize EndP ;---- args.asm ---------------------------------------------------------- ;from KEGELUNX.ARC Unix-like utils. ; Args parses the command line into a unix-style parameter array. ; CALL _ARGS to have it parse the cmdline. ; Argc and Argv are just as in C; argc = # of params on cmd line, ; argv is an array of pointers to strings (null terminated, of course). ; Because MS-DOS doesn't pass us the name used to invoke the program, ; argv[0] always points to a null string. ; _Shift updates argc. ;-------------------------------------------------------------------------- ; Maximum number of parameters MAXPARMS equ 4 _Args proc near ; initialize cld ; clear decrement mode mov bx, 2 ; argc = 0 (will sub 2 from bx at end) mov argv[0], offset null ; prog name unknown; set to null. mov si,offset params ; i = 0 mov cl,nchar ; cx = # of chars in command line xor ch,ch jcxz Args_Done ; no arg chars -> we're done. mov di, si ; pointer to end of cmd line add di, cx mov [di+1],ch ; 0 ; ASCIIZ-ify command line push si ; save vitals parms push cx call Capitalize ; convert to uppercase in situ pop cx ; retrieve vital parms pop si mov di,offset argbuff ;big arg buffer ; Move arguments out of default DTA. push cx push di rep movsb pop si pop cx ; Big loop- find arguments... mov ah,20H ;handy space ParmL: ; Little loop #1: strip leading blanks from argument. ; while (i<NCHAR && params[i] = ' ') do i++; StripL: lodsb ; al = [si++] cmp al,ah ; space? loopz StripL ; if so, keep skipping. jne Args_GotOne ; If we found a nonblank, ; skip zero test. jcxz Args_Done ; found no unblank chars -> we're done. Args_GotOne: dec si ; bump SI back to start of nonblank. inc cx mov argv[bx],si ; save pointer to this string ; Little loop #2: skip nonblank chars. ; while (i<NCHAR && params[i] <> ' ') do i++; SkipL: lodsb cmp al,ah loopnz SkipL jz Oky ; Last char of line was not blank. inc si ; make next statement put null ; AFTER arg. Oky: mov byte ptr [si][-1], 0 ; put null at end of arg add bx,2 ; argc++ jcxz Args_Done ; if we ran off end of cmdline, ; no more args. cmp bx, MAXPARMS*2 jb ParmL ; loop if argc < MAXPARMS. Args_Done: ; All done finding parms; now share argc with caller. mov ax,bx sub ax, 2 shr ax, 1 mov argc,ax ;save argc ret _Args endp ;---- _Shift: -------------------------------------------- ; Shifts %2 to %1, %3 to %2, etc. Leaves %0 alone. ; Works by shuffling argv[*]. _Shift proc near cld mov si, offset argv[4] mov di, offset argv[2] mov cx, MAXPARMS rep movsw dec argc ret _Shift endp ;---- parameter count, array ---------------- ; Pointers to up to MAXPARMS parameter strings are held here. null dw 0 ; the null string argc dw ? argv dw MAXPARMS dup (null) ;Dynamic variables start here. ;Not REAL big .. we could calculate them and release unneeded memory .. ;but who needs it? This ain't TSR, and the normal 64Kb required for ;a .COM program shouldn't stress anyone's system capacity. dta1BA equ $ ;alternate DTA ziptarget equ dta1BA + 42 ;up to 128 bytes pname1 equ ziptarget + 128 ;11-byte FCB filename + 0 argbuff equ pname1 + 14 ;cmdline parsing buff Comment ~ Looks like: +filename.typ 000K / 000K +filename.typ 000K / 000K +filename.typ 000K / 000K Comment ends ~ linebuff equ argbuff ;82 chars long dirbuff equ linebuff + 82 ;ENDOFS bytes long CSEG ENDS END Zdir