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Assembly Source File | 1991-03-03 | 24KB | 1,303 lines

;*********************************************** ; sfx_.asm -- self-extract module ;*********************************************** page 0, 128 include amscls.inc $_init GEN _TEXT segment byte public 'CODE' _TEXT ends DGROUP group _BSS assume cs:_TEXT, ds:DGROUP CRC16 equ 0a001h BufSiz equ 04000h NC = (200h - 2) NP = 14 NT = 19 NPT = 080h CBIT = 9 PBIT = 4 TBIT = 5 DSIZ = 2000h DSIZ2 = DSIZ * 2 LzHead struc HeadSiz db ? HeadChk db ? HeadID db 3 dup (?) Method db ? db ? PacSiz dw 2 dup (?) OrgSiz dw 2 dup (?) FTime dw ? FDate dw ? FAttr dw ? FnLen db ? Fname db 80h dup (?) LzHead ends _BSS segment para public 'BSS' public crctbl public cpyhdr, infile, outfile public inpptr, inpbuf, text_ public curcrc, orgcrc public myname public pathname, fnnext, swchar public blocksize_ text_ db DSIZ2 dup (?) inpbuf db BufSiz dup (?) crctbl dw 100h dup (?) cpyhdr LzHead 1 dup (<?>) inpptr dw 1 dup (?) infile dw 1 dup (?) outfile dw 1 dup (?) orgcrc dw 1 dup (?) curcrc dw 1 dup (?) blocksize_ dw 1 dup (?) len_cnt dw 17 dup (?) start dw 17 dup (?) weight dw 17 dup (?) public len_cnt public start public weight left_ dw 2 * NC - 1 dup (?) right_ dw 2 * NC - 1 dup (?) c_table_ dw 4096 dup (?) pt_table_ dw 256 dup (?) c_len_ db NC dup (?) pt_len_ db NPT dup (?) public left_ public right_ public c_table_ public pt_table_ public c_len_ public pt_len_ bitbuf_ dw 1 dup (?) subbitbuf_ db 1 dup (?) bitcount_ db 1 dup (?) myname db 80h dup (?) pathname db 80h dup (?) fnnext dw 1 dup (?) fnptr dw 1 dup (?) swchar db 1 dup (?) endBBS label byte _BSS ends _TEXT segment byte public 'CODE' assume cs:_TEXT org 0100h public start, main public BSSseg public #cright, crlf, space public absent, #myself, broken, extend public #subver top: jmp main BSSseg = (#endofcode - top + 10fh) / 10h mes_yn equ space - 1 space db ' ', 0 #cright db "LHA's SFX 2.11" #subver db "L (c) Yoshi, 1991" crlf db 13, 10, 0 absent db 'Rename to ' #myself db 'FILENAME.EXT', 0 overwt db 'Overwrite ', 0 yesno db '[Y/N] ', 0 broken db 'Broken file ', 0 write db 'Write', 0 header db 'Header', 0 crcmes db 'CRC' error db ' Error', 0 auto db 1, '!' autoflg db '.' shr 1 db 'BAT' extend db 0ffh attrib db 0 envseg = 002ch cmdcnt = 0080h cmdline = 0081h ;----------------------------------------------- ; âüâCâôâïü[â`âô ;----------------------------------------------- main: cld mov sp, offset top mov ax, cs add ax, BSSseg mov es, ax assume es:DGROUP call @getopt public #getopt #getopt: mov bx, offset #cright call mesout push es pop ds assume ds:DGROUP ;----------------------------------------------- ; Get my name ;----------------------------------------------- mov ah, 30h int 21h ; get DOS ver. mov bx, ax push ds $_if <cmp al, 3>, AE ; if DOS ver. >= 3.00 mov es, ss:[envseg] xor ax, ax mov di, ax mov cx, -1 $_do repne scasb scasb $_until , E inc ax scasw push es pop ds mov dx, di $_if , E call openme $_endif $_endif brknenv: push cs pop ds mov dx, offset #myself call openme $_if <cmp bl, 2>, E ; if DOS ver. = 2 mov ax, ss:[0002h] ; get pathname from trash sub ax, 38h ; of command.com mov ds, ax mov dx, 0009h call openme $_endif mov bx, offset absent jmp errout1 openme: mov ax, 3d00h int 21h ; Open Myself $_if , C ret $_endif pop cx ; pop old ip pop ds mov infile, ax mov bx, ax xor cx, cx ifndef COM exehdr = 20h else exehdr = 0h endif mov dx, (#endofcode - top) + exehdr public #seeksize #seeksize: mov ax, 4200h int 21h ; Move a File Pointer $_if , C brokenerr: mov bx, offset broken ; Broken file jmp errout $_endif push ds pop es ;--------------------------------------- ; make CRC table ;--------------------------------------- mov di, offset crctbl xor dx, dx $_do mov ax, dx mov cx, 8 $_do $_if <shr ax, 1>, C xor ax, CRC16 $_endif $_until <LOOP> stosw $_until <inc dl>, Z ;--------------------------------------- public mainloop mainloop: $_while <TRUE> call crlfout ; Get Header --------------------------- mov si, offset DGROUP:cpyhdr.HeadSiz mov dx, si mov cx, 1 mov [si], ch mov bx, infile mov ah, 3fh int 21h ; Read header size dec cx ; cx = 0 add cl, [si] $_if , Z jmp exit $_endif inc dx inc si inc cx mov ah, 3fh int 21h ; Read header ; Test Header Sum ---------------------- lodsb push si ; cpyhdr.HeadID dec cx dec si $_do inc si sub al, [si] $_until <LOOP> jne errhdr pop si ; Test Header ID ----------------------- lodsw $_if <cmp ax, 'l-'>, NE, OR lodsw xchg al, ah sub ax, 'h0' mov bp, ax ; bp = method $_c , NZ, AND $_c <sub ax, 0004h>, NE, AND $_c <dec ax> , NE, OR lodsb $_c <sub al, '-'>, NZ errhdr: mov bx, offset header jmp errout $_endif ; Get original CRC --------------------- mov bx, offset DGROUP:cpyhdr.Fname mov dx, bx mov cx, [bx - 1] add bl, cl ; doesn't carry up xchg ax, [bx] ; ax = 0, [bx] = CRC mov orgcrc, ax ; Test Special File ? ------------------ mov fnptr, dx cmp cx, 2101h ; 01h, '!' $_if , E mov ax, 1 jmp mn7 $_endif call @extended public #extended #extended: ; Display File name -------------------- mov word ptr [bx], 0 * 256 + ' ' mov bx, dx call disp ; output file name mov byte ptr [bx - 1], 0 jcxz mn9 ; !.BAT ? ; Check Existence of File -------------- mov ax, 4300h ; get file attr int 21h ; (for MS-DOS 3.3) jc mn1 ; Overwrite ? -------------------------- mov bx, offset overwt ; prompt call mesout call getyn je mn1 ; Skip to next File -------------------- mov dx, DGROUP:cpyhdr.PacSiz ; skip file mov cx, DGROUP:cpyhdr.PacSiz + 2 mov bx, infile mov ax, 4201h int 21h ; Move a File Pointer jmp mn6 mn9: mov cs:autoflg, 0dh ; Create a New File -------------------- mn1: mov cx, 0020h mov ah, 3ch int 21h ; Create a File $_if , C jmp errwrite $_endif ; Decode ------------------------------- mn7: mov outfile, ax xor ax, ax mov curcrc, ax dec ax mov inpptr, ax push dx $_if <or bp, bp>, NZ call decode $_else call copyall $_endif pop si ; Set Time-Stamp ----------------------- mov bx, outfile cmp bx, 1 ; file '!' ? je mn8 mov dx, DGROUP:cpyhdr.FDate mov cx, DGROUP:cpyhdr.FTime mov ax, 5701h ; set date int 21h call close ; Check CRC ---------------------------- mov ax, curcrc cmp ax, orgcrc jne errcrc call @setattr public #setattr #setattr: jmp mn6 mn8: call getyn jne exit1 mn6: $_enddo mov bx, infile call close public exit exit: call @autoexec public #autoexec #autoexec: exit1: xor al, al exit2: mov ah, 4ch int 21h ;----------------------------------------------- ; âGâëü[Åêù¥ ;----------------------------------------------- public errhdr, errwrite, errout errcrc: call unlink mov bx, offset crcmes jmp short errout1 errwrite: mov bx, outfile call close call unlink mov bx, offset write errout: call mesout mov bx, offset error errout1: call mesout mov al, 1 jmp exit2 ;----------------------------------------------- ; get 'Y' or 'N' ;----------------------------------------------- public getyn getyn proc near mov bx, offset yesno ; prompt call mesout $_do mov ah, 08h int 21h and al, 0dfh $_until <cmp al, 'Y'>, E, OR $_c <cmp al, 'N'>, E mov bx, offset mes_yn mov cs:[bx], al call mesout cmp al, 'Y' ret getyn endp ;----------------------------------------------- ; âoâbâtâ@é╠Åoù═ ;----------------------------------------------- public putbuf public putbuf2 putbuf proc near xor dx, dx ; mov dx, offset DGROUP:text_ mov cx, di sub cx, dx putbuf2: jcxz return mov bx, outfile mov ah, 40h int 21h $_if <sub ax, cx>, NE cmp bx, 1 jne errwrite $_endif calccrc: mov si, dx mov bx, curcrc ; xor ah, ah ; ah = 0 ; cld $_do lodsb xor bl, al mov al, bh mov bh, ah shl bx, 1 mov bx, crctbl[bx] xor bx, ax $_until <LOOP> mov curcrc, bx mov di, dx cmp outfile, 1 je return mov ah, 02h mov dl, '.' jmp short int21_ret ; int 21h ; ret putbuf endp ;----------------------------------------------- ; é╗é╠é▄é▄Åoù═ ;----------------------------------------------- public copyall copyall proc near xor di, di $_while <TRUE> mov bx, offset DGROUP:cpyhdr.OrgSiz sub [bx], di sbb word ptr 2[bx], 0 mov cx, DSIZ2 $_if , Z, AND mov ax, [bx] or ax, ax jz cpyend $_c <cmp ax, cx>, B mov cx, ax $_endif xor dx, dx ; mov dx, offset DGROUP:text_ mov bx, infile mov ah, 3fh int 21h push cx call putbuf2 pop di $_enddo cpyend: ret copyall endp ;----------------------------------------------- ; âtâ@âCâïé╠ close ;----------------------------------------------- public close close proc near mov ah, 3eh jmp short int21_ret ; int 21h ; ret close endp ;----------------------------------------------- ; âtâ@âCâïé╠ìφÅ£ ;----------------------------------------------- public unlink unlink proc near mov dx, fnptr mov ah, 41h ; unlink int21_ret: int 21h return: ret unlink endp ;----------------------------------------------- ; CR, LF é╠Åoù═ ;----------------------------------------------- crlfout proc near mov bx, offset crlf crlfout endp ;----------------------------------------------- ; âüâbâZü[âWé╠Åoù═ ;----------------------------------------------- public mesout mesout proc near push ds push cs pop ds call disp pop ds ret mesout endp ;----------------------------------------------- ; display ASCIZ char ;----------------------------------------------- public disp disp proc near push ax push dx $_do mov dl, [bx] inc bx mov ah, 02h int 21h $_until <cmp byte ptr [bx], 0>, E pop dx pop ax ret disp endp ;----------------------------------------------- ; getc ; ax: 1 byte (return) ;----------------------------------------------- public getc getc proc near mov bx, inpptr $_if <cmp bx, offset inpbuf + BufSiz>, AE ;----------------------------------------------- ; buffer ôⁿù═ ;----------------------------------------------- public getbuf getbuf proc near push cx push dx mov dx, offset DGROUP:inpbuf mov cx, BufSiz mov bx, offset DGROUP:cpyhdr.PacSiz sub [bx], cx sbb word ptr 2[bx], 0 $_if , C add cx, [bx] $_endif mov bx, infile mov ah, 3fh int 21h ; Read from an Archive mov bx, dx pop dx pop cx getbuf endp ;----------------------------------------------- $_endif mov al, [bx] inc bx mov inpptr, bx ret getc endp ;----------------------------------------------- ; extract routines ;----------------------------------------------- public decode decode proc near xor ax, ax mov blocksize_, ax mov bitbuf_, ax mov subbitbuf_, al mov bitcount_, al mov al,16 call fillbuf_ xor di, di ; mov di, offset DGROUP:text_ jmp $entry $loop: call decode_c_st1_ $_if <or ah, ah>, Z stosb $_if <cmp di, offset DGROUP:text_[DSIZ2]>, E call putbuf $_endif $entry: sub word ptr cpyhdr.OrgSiz, 1 jnc $loop $_else mov cx, ax sub cx, 100h - 3 call decode_p_st1_ mov si, di stc sbb si, ax push cx $_do and si, DSIZ2 - 1 movsb test di, DSIZ2 $_if , NZ push cx push si call putbuf pop si pop cx $_endif $_until <LOOP> pop cx sub word ptr cpyhdr.OrgSiz, cx jnc $loop $_endif sbb word ptr cpyhdr.OrgSiz + 2, 0 jnc $loop $endloop: jmp putbuf decode endp ; static void read_pt_len(short nn, short nbit, short i_special) ;public read_pt_len_ read_pt_len_ proc near push si mov al, dl call getbits_ $_if <cmp ax, si>, A jmp brokenerr $_endif mov di, offset DGROUP:pt_len_ $_if <or ax, ax>, Z pop cx rep stosb mov al, dl call getbits_ mov cx, 256 mov di, offset DGROUP:pt_table_ rep stosw ret $_else mov dx, cx ; dl = i_special add dx, di mov si, di add si, ax ; ax = n $_do mov al, 3 call getbits_ $_if <cmp al, 7>, E mov bx, bitbuf_ $_while <shl bx, 1>, C inc ax $_enddo push ax sub al, 6 call fillbuf_ pop ax $_endif stosb $_if <cmp di, dx>, E mov al, 2 call getbits_ mov cx, ax xor al, al rep stosb $_endif $_until <cmp di, si>, AE pop si ; nn mov bp, offset DGROUP:pt_len_ lea cx, [bp + si] ; lea cx, DGROUP:pt_len_[si] sub cx, di xor al, al rep stosb mov ax, si mov cx, 8 mov di, offset DGROUP:pt_table_ jmp make_table_ $_endif read_pt_len_ endp ; static void read_c_len(void) ;public read_c_len_ read_c_len_ proc near mov al, CBIT call getbits_ $_if <cmp ax, NC>, A jmp brokenerr $_endif mov di, offset DGROUP:c_len_ $_if <or ax, ax>, Z mov cx, NC rep stosb mov al, CBIT call getbits_ mov cx, 4096 mov di, offset DGROUP:c_table_ rep stosw ret $_else mov dx, di add dx, ax ; ax = n push di $_do mov ax, bitbuf_ mov bl, ah xor bh, bh shl bx, 1 mov bx, pt_table_[bx] mov si, offset read_c_len_1 mov cx, NT jmp tree1 if 0 $_while <cmp bx, NT>, AE $_if <shl al, 1>, C mov bx, right_[bx] $_else mov bx, left_[bx] $_endif $_enddo endif read_c_len_1: push bx mov al, pt_len_[bx] call fillbuf_ pop ax $_if <sub ax, 2>, BE $_if , Z mov al, CBIT call getbits_ add ax, 20 mov cx, ax $_else $_if <inc ax>, Z mov al, 4 call getbits_ add ax, 3 mov cx, ax $_else mov cx, 1 $_endif $_endif xor al, al rep stosb $_else stosb $_endif $_until <cmp di, dx>, AE mov cx, offset DGROUP:c_len_ + NC sub cx, di xor al, al rep stosb mov ax, NC pop bp mov cx, 12 mov di, offset DGROUP:c_table_ jmp make_table_ $_endif read_c_len_ endp ; ushort decode_c_st1(void) decode_c proc near ; not entry here decode_c_st1_2: push di mov al, 16 call getbits_ dec ax mov blocksize_, ax mov si, NT mov dl, TBIT mov cx, 3 call read_pt_len_ call read_c_len_ mov si, NP mov dl, PBIT mov cx, -1 call read_pt_len_ pop di jmp decode_c_st1_3 ; ; entry here ; public decode_c_st1_ decode_c_st1_: sub blocksize_, 1 jc decode_c_st1_2 decode_c_st1_3: mov bx, bitbuf_ mov cl, 4 shr bx, cl shl bx, 1 mov bx, c_table_[bx] $_if <cmp bx, NC>, B decode_c_st1_1: push bx mov al, c_len_[bx] call fillbuf_ pop ax ret $_endif mov ax, bitbuf_ shl al, cl mov si, offset decode_c_st1_1 mov cx, NC tree0: $_do $_if <shl al, 1>, C mov bx, right_[bx] $_else mov bx, left_[bx] $_endif tree1: $_until <cmp bx, cx>, B jmp si decode_c endp ; ushort decode_p_st1(void) public decode_p_st1_ decode_p_st1_ proc near ;--------------------------------------------------------------- ; ushort decode_p_st1(void) ;--------------------------------------------------------------- push cx xor bh, bh mov bl, byte ptr bitbuf_ + 1 shl bx, 1 mov bx, pt_table_[bx] $_if <cmp bx, NP>, B decode_p_st1_1: push bx mov al, pt_len_[bx] call fillbuf_ pop ax $_if <cmp al, 1>, A dec ax mov cx, ax call getbits_ mov bx, 1 shl bx, cl or ax, bx $_endif pop cx ret $_endif mov al, byte ptr bitbuf_ mov si, offset decode_p_st1_1 mov cx, NP jmp tree0 if 0 $_do $_if <shl al, 1>, C mov bx, right_[bx] $_else mov bx, left_[bx] $_endif $_until <cmp bx, NP>, B jmp decode_p_st1_1 endif decode_p_st1_ endp ;--------------------------------------------------------------- ; void make_table(short nchar, uchar bitlen[], ; ax bp ; short tablebits, ushort table[]) ; cx di ;--------------------------------------------------------------- _BSS segment para public 'BSS' avail_mt dw 1 dup (?) nchar dw 1 dup (?) bitlen dw 1 dup (?) tablebits dw 1 dup (?) table dw 1 dup (?) restbits db 1 dup (?) public avail_mt public nchar public bitlen public tablebits public table public restbits _BSS ends public make_table_ make_table_ proc near mov nchar, ax shl ax, 1 mov avail_mt, ax mov tablebits, cx mov table, di mov al, 16 sub al, cl mov restbits, al mov ax, 1 shl ax, cl mov cx, ax xor ax, ax rep stosw xor si, si mov bx, 8000h mov dx, 1 $_do mov di, bp mov cx, nchar $_do mov al, dl repne scasb jne mt1 mov ax, di sub ax, bp dec ax push cx push di ; ; bx = weight ; ; si = code ; ; dx = len mov cl, restbits mov di, si shr di, cl shl di, 1 add di, table push bx $_if <cmp dx, tablebits>, BE shr bx, cl mov cx, bx rep stosw $_else ; /* ìéé│ n é╠ tree é≡ì∞éΘ */ ; ; di = taddr ; ; si = ; ; cx = ; ; ax = char push si mov cx, tablebits shl si, cl neg cx add cx, dx $_do $_if <cmp word ptr [di], 0>, E ; /* Ä}é¬é▄é╛ëäé╤é─éóé╚é»éΩé╬ì∞éΘ */ mov bx, avail_mt mov right_[bx], 0 mov left_[bx], 0 mov [di], bx add avail_mt, 2 $_endif mov di, [di] $_if <shl si, 1>, C add di, offset DGROUP:right_ $_else add di, offset DGROUP:left_ $_endif $_until <LOOP> mov [di], ax pop si $_endif pop bx pop di pop cx add si, bx jc mt2 $_until <or cx, cx>, Z mt1: inc dx shr bx, 1 $_until , C public mt2 mt2: ret make_table_ endp ;----------------------------------------------- ; ôⁿù═é⌐éτéÄârâbâgé≡ô╛éΘ ;----------------------------------------------- ; ;ushort getbits(uchar n) ;{ public getbits_ getbits_: push cx mov cl, 16 sub cl, al push bitbuf_ call fillbuf_ pop ax shr ax, cl pop cx ret ; ;void fillbuf(uchar n) /* Shift bitbuf n bits left, read n bits */ ;{ public fillbuf_ fillbuf_: push cx push dx mov ch, al mov cl, bitcount_ mov dx, bitbuf_ mov al, subbitbuf_ $_if <cmp ch, cl>, A sub ch, cl shl dx, cl rol al, cl add dl, al mov cl, 8 fb1: call getc $_if <cmp ch, cl>, A sub ch, cl mov dh, dl mov dl, al jmp fb1 $_endif $_endif sub cl, ch mov bitcount_, cl mov cl, ch xor ah, ah shl dx, cl shl ax, cl add dl, ah mov bitbuf_, dx mov subbitbuf_, al pop dx pop cx ret public #endofshort #endofshort: public @autoexec @autoexec: $_if <cmp cs:autoflg, 0dh>, E push cs pop es mov bx, (offset resident - top + 100h + 15) / 16 mov ah, 4ah int 21h push cs pop ds mov si, offset auto int 2eh ; execute $_endif jmp #autoexec resident: ;----------------------------------------------- ; Get options ;----------------------------------------------- public @getopt @getopt: mov ax, 3700h int 21h ; get switch char mov si, cmdline mov es:swchar, dl mov es:fnnext, offset DGROUP:pathname $_do lodsb $_if <cmp al, ' '>, A $_if <cmp al, es:swchar>, E, OR $_c <cmp al, '-'>, E lp0: lodsb cmp al, ' ' jbe lp1 or al, 20h $_switch $_case <cmp al, '!'>, E shl cs:autoflg, 1 $_case <cmp al, 'x'>, E inc cs:extend $_case <cmp al, 'a'>, E inc cs:attrib $_default cmp al, 'e' jne lp0 lodsb $_endswitch $_endif dec si mov di, offset DGROUP:pathname push si call convert pop si push ax mov al, '/' call trans mov al, '/' $_if <cmp ah, al>, NE, AND $_c <cmp ah, ':'>, NE stosb $_endif mov es:fnnext, di pop ax lp1: $_endif $_until <cmp al, 0dh>, E ret public @extended @extended: mov si, dx mov di, offset auto + 1 ; !.BAT ? cmp cl, 5 jne mn5 push es push cs pop es xor ch, ch rep cmpsb pop es je mn2 ; -x switch ---------------------------- mn5: mov si, dx mov cx, si call convert $_if <cmp cs:extend, 0>, E mov dx, cx ; last delim $_endif ; -eDIRECTORY -------------------------- mov si, dx mov al, [si] $_if <cmp al, '/'>, NE mov di, fnnext call trans mov bx, di mov dx, offset DGROUP:pathname $_else mov ax, word ptr DGROUP:pathname $_if <cmp ah, ':'>, E dec dx dec dx mov di, dx mov [di], ax ; brakes FnLen and $_endif ; upper byte of FAttr $_endif ; Make Directories --------------------- mov si, dx $_do lodsb $_if <cmp al, '/'>, E mov byte ptr [si - 1], 0 mov ah, 39h ; make dir int 21h mov byte ptr [si - 1], '/' $_endif $_until <cmp si, bx>, AE mov fnptr, dx mov cx, 1 mn2: ret ; Set File Attributes ------------------ public @setattr @setattr: $_if <cmp attrib, 0>, NE mov dx, si mov cl, byte ptr DGROUP:cpyhdr.FAttr xor ch, ch mov ax, 4301h int 21h ; Set File Attributes $_endif ret ;----------------------------------------------- ; convert '\' to '/' & terminater ;----------------------------------------------- conv proc near $_do $_if <cmp al, '\'>, E, OR $_c <cmp al, '/'>, E mov byte ptr -1[si], '/' mov cx, si $_endif ; is kanji --------------------- and al, 0e0h shl al, 1 $_if , C, AND $_c , PE inc si $_endif ; ------------------------------ convert: lodsb $_until <cmp al, ' '>, BE dec si mov byte ptr [si], 0 ret conv endp ;----------------------------------------------- ; transfer string ;----------------------------------------------- trans proc near $_do mov ah, al lodsb stosb $_until <or al, al>, E dec di ret trans endp public #endofcode #endofcode: _TEXT ends end top