155 lines
2.3 KiB
NASM
155 lines
2.3 KiB
NASM
; HEX2BIN
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; Converts Intel hex format files to straight binary
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FCB: EQU 5CH
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READ: EQU 20
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SETDMA: EQU 26
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OPEN: EQU 15
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CLOSE: EQU 16
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CREATE: EQU 22
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DELETE: EQU 19
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BLKWRT: EQU 40
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BUFFER: EQU 80H
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BUFSIZ: EQU 128
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ORG 100H
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PUT 100H
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HEX2BIN:
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MOV DI,FCB+9
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CMP B,[DI]," "
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JNZ HAVEXT
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MOV SI,HEX
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MOVB
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MOVW
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HAVEXT:
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;Get load offset (default is -100H)
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MOV AH,OPEN
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MOV DX,FCB
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INT 33
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OR AL,AL
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JNZ NOFIL
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MOV B,[FCB+32],0
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MOV AH,READ
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MOV BP,START
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MOV SI,BUFFER+BUFSIZ ;Flag input buffer as empty
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READHEX:
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CALL GETCH
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CMP AL,":" ;Search for : to start line
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JNZ READHEX
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CALL GETBYT ;Get byte count
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MOV CL,AL
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MOV CH,0
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JCXZ DONE
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CALL GETBYT ;Get high byte of load address
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MOV BH,AL
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CALL GETBYT ;Get low byte of load address
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MOV BL,AL
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ADD BX,START-100H ;Add in offset
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MOV DI,BX
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CALL GETBYT ;Throw away type byte
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READLN:
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CMP DI,[6]
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JAE ADERR
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CMP DI,START
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JB ADERR
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CALL GETBYT ;Get data byte
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STOB
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LOOP READLN
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CMP DI,BP ;Check if this is the largest address so far
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JBE READHEX
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MOV BP,DI ;Save new largest
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JP READHEX
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NOFIL:
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MOV DX,NOFILE
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QUIT:
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MOV AH,9
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INT 33
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INT 32
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ADERR:
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MOV DX,ADDR
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JMP ERROR
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GETCH:
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CMP SI,BUFFER+BUFSIZ
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JNZ NOREAD
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INT 33
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OR AL,AL
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JNZ ERROR
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MOV SI,BUFFER
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NOREAD:
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LODB
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CMP AL,1AH
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JZ DONE
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RET
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GETBYT:
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CALL HEXDIG
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MOV BL,AL
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CALL HEXDIG
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SHL BL
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SHL BL
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SHL BL
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SHL BL
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OR AL,BL
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RET
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HEXDIG:
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CALL GETCH
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SUB AL,"0"
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JC ERROR
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CMP AL,9
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JBE RET
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SUB AL,"A"-"0"-10
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JC ERROR
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CMP AL,15
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JBE RET
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ERROR:
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MOV DX,ERRMES
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MOV AH,9
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INT 33
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DONE:
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MOV DI,FCB+9
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MOV SI,COM
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MOVB
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MOVW
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MOV DX,FCB
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MOV AH,DELETE
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INT 33
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MOV AH,CREATE
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INT 33
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OR AL,AL
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JNZ NOROOM
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MOV W,[FCB+33],0
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MOV DX,START
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MOV AH,SETDMA
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INT 33
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MOV CX,BP
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SUB CX,START-7FH
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AND CL,80H
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JCXZ EXIT
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ROL CX
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XCHG CL,CH
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MOV AH,BLKWRT
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MOV DX,FCB
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INT 33
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MOV AH,CLOSE
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INT 33
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EXIT:
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INT 32
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NOROOM:
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MOV DX,DIRFUL
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JMP QUIT
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HEX: DB "HEX"
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COM: DB "COM"
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ERRMES: DB "Error in HEX file--conversion aborted$"
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NOFILE: DB "File not found$"
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ADDR: DB "Address out of range--conversion aborted$"
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DIRFUL: DB "Disk directory full$"
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START:
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