Columbia Kermit/kermit.zip/mskermit/msbpct.asm

Assembly Source File | 2020-01-01 | 7KB | 390 lines

    TITLE    MSBPC2 MS-DOS System BOO to EXE Utility Program

; (c) 1988 W.C. Parke, WGCP0086@GWUVM

; This program converts a BOO file to an EXE or binary file
;
;  BOO files are ASCII files constructed from binary files and used
;  to transfer the files over networks or tape which do not accept binary.
;  The translation is by the following algorithm (by Bill Catchings):
;    1. The name of the file is placed on the first line, in plain text,
;       followed by CR,LF
;    2. If a series of nulls occurs, a '~' (7EH) is used followed by
;       an byte number for the null count, with a '0' bias, up to 7EH.
;    3. Three byte sequences are coded as 4 bytes, taking 6 bits from
;       each byte and adding a '0' bias.
;    4. Carriage return/linefeeds are inserted to make lines break
;       at approximately column 76.
;
; MSBPC2 compiled with MASM 5.10.  Use LINK and EXE2BIN to make COM file.
;
; May be used with any BOO file on any MS-DOS path.
;
; This program translated the MSVIBM.BOO file in 15 seconds
; on an IBM XT clone.  MSBPCT V1.0 took 6 min. 32 sec.
; The dramatic speed up comes largely from using large
; local file buffers.
;
; MSBPC2 uses the file name on the first line of the BOO file
; for its output file.

LF    EQU    0AH
CR    EQU    0DH
BUFSIZ    EQU    6000H

CODE    SEGMENT
    ASSUME    CS:CODE,DS:CODE,ES:CODE,SS:CODE

    ORG    100H

START:    JMP    BOO
FHAND1    DW    0
FNAM1    DB    80 DUP(0)
FHAND2    DW    0
FNAM2    DB    80 DUP(0)
INVOC    DB    CR,LF,'MSBPC2 Version 1.1'
    DB    CR,LF,'BOO file to binary file converter.'
    DB    CR,LF,'(c) 1988 W.C. Parke',CR,LF,CR,LF,'$'
DHPERR    DB    'Syntax:',CR,LF,LF
    DB    '  MSBPC2 boofile',CR,LF,CR,LF,'$'
DCONV    DB    'Converting $'
DTO    DB    ' to $'
DDOT    DB    ' ...$'
DEXIST    DB    ' already exists. Overwrite it? $'
DERROR    DB    CR,LF,'Error in file $'
DOPERR    DB    'open$'
DCRERR    DB    'creation$'
DCHERR    DB    'character$'
DCLERR    DB    'close$'
DRDERR    DB    'read$'
DWRERR    DB    'write$'
DERRF    DB    '.',CR,LF,'$'
DONE    DB    CR,LF,'Done.',CR,LF,'$'

BOO:    MOV    AH,9
    MOV    DX,OFFSET INVOC
    INT    21H            ; invocation
    MOV    SI,80H
    LODSB
    XOR    AH,AH            ; command line tail size
    AND    AX,AX
    JNZ    BOF
    JMP    ABORTHP
BOF:    MOV    DI,OFFSET FNAM1
    INC    AX
    MOV    CX,AX
    PUSH    DI
BO0:    LODSB
    CMP    AL,CR
    JZ    BO1
    CMP    AL,20H
    JZ    BOL
    CMP    AL,'a'
    JC    BOS
    AND    AL,5FH
BOS:    STOSB                ; save possible file name
BOL:    LOOP    BO0
BO1:    XOR    AL,AL
    STOSB
    POP    DX
    MOV    AH,3DH        ; try to open file
    INT    21H
    JNC    BO2
    JMP    ABORTOP
BO2:    MOV    FHAND1,AX
    MOV    DI,OFFSET FNAM2
    MOV    SI,OFFSET FBUF1
    XOR    AX,AX
    MOV    CNT1,AX
    MOV    CNT2,AX
BOON:    CALL    GETBN        ; get file name from first line of file
    JZ    BOG
    STOSB
    JMP    SHORT BOON
BOG:    XOR    AL,AL
    STOSB
    MOV    DX,OFFSET FNAM2
    XOR    CX,CX
    MOV    AH,4EH
    INT    21H        ; search for file in our directory
    JC    BOZ        ; not there
    PUSH    SI
    MOV    SI,OFFSET FNAM2
    CALL    SHOW
    POP    SI
    MOV    AH,9
    MOV    DX,OFFSET DEXIST
    INT    21H
    MOV    AX,0C01H    ; say exists, overwrite?
    INT    21H
    PUSH    AX
    MOV    AH,2
    MOV    DL,CR
    INT    21H
    MOV    DL,LF
    INT    21H
    POP    AX
    AND    AL,5FH
    CMP    AL,'Y'
    JZ    BOZ
    JMP    EXIT
BOZ:    MOV    DX,OFFSET FNAM2
    MOV    AH,3CH
    XOR    CX,CX
    INT    21H        ; create output file
    JC    ABORTCR
    MOV    FHAND2,AX
    PUSH    SI
    MOV    AH,9
    MOV    DX,OFFSET DCONV    ; say converting
    INT    21H
    MOV    SI,OFFSET FNAM1    ; this file
    CALL    SHOW
    MOV    AH,9
    MOV    DX,OFFSET DTO    ; to
    INT    21H
    MOV    SI,OFFSET FNAM2    ; this one
    CALL    SHOW
    MOV    AH,9
    MOV    DX,OFFSET DDOT    ; show dots
    INT    21H
    POP    SI
    MOV    DI,OFFSET FBUF2
    JMP    NEXT        ; conversion loop
PUBLIC FIN
FIN:    CALL    OUTLST
    JC    ABORTCL
    MOV    AH,9
    MOV    DX,OFFSET DONE    ; say done
    INT    21H
EXIT:    MOV    AX,4C00H
    INT    21H
ABORTOP:
    MOV    DX,OFFSET DOPERR    ; file open error
    MOV    AL,2
    JMP    ABORT
ABORTCR:
    MOV    DX,OFFSET DCRERR    ; file create error
    MOV    AL,3
    JMP    ABORT
ABORTCL:
    MOV    DX,OFFSET DCLERR    ; file close error
    MOV    AL,7
    JMP    ABORT
PUBLIC NULLS                ; process nulls
NULLS:    CALL    GETB
    XOR    AH,AH
    MOV    CX,AX
    XOR    AL,AL
PUBLIC NULLN
NULLN:    CALL    OUTB
    LOOP    NULLN
PUBLIC NEXT
NEXT:    CALL    GETB
    CMP    AL,'~'-'0'
    JZ    NULLS            ; got a null code
    MOV    AH,AL
    CALL    GETB
    MOV    BX,AX            ; save first code pair in bx
    CALL    GETB
    MOV    AH,AL
    CALL    GETB            ; save second code pair in ax
    SHL    AL,1
    SHL    AL,1
    SHL    BL,1
    SHL    BL,1            ; bx ax = 0xxxxxx0 0xxxxxx0
    SHL    AX,1
    SHL    AX,1
    SHR    BX,1
    SHR    BX,1            ; bx ax = 00xxxxxx xxxxxx00

    SHL    AX,1
    RCL    BX,1
    RCL    AX,1
    RCL    BX,1
    RCL    AX,1
    RCL    BX,1
    RCL    AX,1
    RCL    BX,1            ; bx ax = xxxxxxxx xxxx0000
    MOV    DX,AX
    MOV    AL,BH
    CALL    OUTB
    MOV    AL,BL
    CALL    OUTB
    MOV    AL,DH
    CALL    OUTB
    JMP    NEXT

PUBLIC GETB
CNT1    DW    0
GETBF:    CALL    GETMF        ; load buffer from file
    JNC    GETBG
    JMP    SHORT GETBEC    ; error loading buffer

GETB:                ; get a byte from input
    CMP    WORD PTR CNT1,0
    JZ    GETBF        ; no more bytes in buffer - read more in
GETBG:    LODSB
    DEC    WORD PTR CNT1
    AND    AL,7FH        ; drop eigth bit
    CMP    AL,7FH        ; our EOF byte
    JZ    GETBFIN
    CMP    AL,LF        ; skip lf's
    JZ    GETB
    CMP    AL,CR        ; skip cr's
    JZ    GETB
    CMP    AL,1AH        ;^Z
    JZ    GETBFIN        ; EOF for ascii file
    AND    AL,AL
    JZ    GETBFIN        ; null also EOF for ascii file
    SUB    AL,'0'        ; remove bias
    JC    GETBEC        ; no other control codes allowed
    RET
GETBEC:    POP    AX
    JMP    ABORTCH        ; character error in file
GETBFIN:
    POP    AX
    JMP    FIN        ; write and close output file

GETMF:                ; get more from input file
    PUSH    AX
    PUSH    BX
    PUSH    CX
    PUSH    DX
    MOV    BX,FHAND1
    MOV    DX,OFFSET FBUF1    ; buffer for input file bytes
    MOV    AH,3FH
    MOV    CX,BUFSIZ    ; size of buffer
    INT    21H        ; get bytes
    MOV    SI,OFFSET FBUF1
    POP    DX
    POP    CX
    POP    BX
    JC    GETBC        ; error reading input file
    MOV    CNT1,AX
    CMP    AX,BUFSIZ
    JC    GETBE        ; got less than full buffer
    POP    AX
    RET
GETBE:    PUSH    BX
    MOV    BX,WORD PTR CNT1
    MOV    AX,07F7FH
    MOV    WORD PTR [SI+BX],AX    ; terminator bytes are 7fh
    POP    BX
    CLC
GETBC:    POP    AX        ; carry error
    RET

PUBLIC GETBN
GETBN:                ; get file name from first line of input file
    CMP    WORD PTR CNT1,0
    JZ    GETBM
GETBNG:    LODSB
    DEC    WORD PTR CNT1
    AND    AL,7FH
    CMP    AL,LF        ; end of line sets Zero flag
    JZ    GETR
    CMP    AL,CR        ; end of line sets Zero flag
GETR:    RET
GETBM:    CALL    GETMF        ; get more characters from file
    JNC    GETBNG        ; ok to get a character from buffer
    POP    AX
    JMP    ABORTRD        ; file read error

PUBLIC OUTB
CNT2    DW    0
OUTBB:    CALL    OUTBF
    JC    OUTBCA
OUTB:                ; output a byte to output buffer
    CMP    CNT2,BUFSIZ
    JNC    OUTBB
    STOSB            ; store byte
    INC    WORD PTR CNT2
    CLC
    RET
OUTBCA:    POP    AX
    JMP    ABORTWR        ; problems with write

OUTBF:                ; flush output buffer to file
    PUSH    AX
    PUSH    BX
    PUSH    CX
    PUSH    DX
    MOV    BX,WORD PTR FHAND2
    MOV    AH,40H
    MOV    DX,OFFSET FBUF2
    MOV    CX,BUFSIZ
    INT    21H
    POP    DX
    POP    CX
    POP    BX
    JC    OUTBC        ; write error
    CMP    AX,BUFSIZ
    JNZ    OUTBC        ; incomplete write, disk full
    MOV    WORD PTR CNT2,0
    MOV    DI,OFFSET FBUF2
OUTBC:    POP    AX
    RET

OUTLST:                ; flush last of buffer, then close file
    MOV    BX,WORD PTR FHAND2
    MOV    AH,40H
    MOV    DX,OFFSET FBUF2
    MOV    CX,CNT2
    INT    21H
    MOV    AH,3EH
    INT    21H
    RET
ABORTHP:                ; abort with help screen
    MOV    DX,OFFSET DHPERR
    MOV    AH,9
    INT    21H
    MOV    AX,4C01H
    INT    21H
ABORTRD:
    MOV    DX,OFFSET DRDERR    ; abort, file read error
    MOV    AL,4
    JMP    SHORT ABORT
ABORTCH:                ; abort, file character error
    CALL    OUTLST
    MOV    DX,OFFSET DCHERR
    MOV    AL,5
    JMP    SHORT ABORT
ABORTWR:                ; abort, file write error
    MOV    DX,OFFSET DWRERR
    MOV    AL,6
ABORT:    CALL    ABERR            ; show start of error message
    PUSH    AX
    MOV    AH,9            ; show text of error message
    INT    21H
    MOV    DX,OFFSET DERRF        ; period ending
    INT    21H
    POP    AX            ; recover error index
    MOV    AH,4CH
    INT    21H
ABERR:    PUSH    AX
    PUSH    DX
    MOV    DX,OFFSET DERROR
    MOV    AH,9
    INT    21H
    POP    DX
    POP    AX
    RET
    EVEN
SHOW:    MOV    AH,2            ; show asciiz string
SHOM:    LODSB
    AND    AL,AL
    JZ    SHOE
    MOV    DL,AL
    INT    21H
    JMP    SHORT SHOM
SHOE:    RET

FBUF1    EQU    $
FBUF2    EQU    $+BUFSIZ

CODE    ENDS

    END    START