// EFTPDR.BPL -- EFTP DRIVER ROUTINE --
// Copyright Xerox Corporation 1979

GET "RT11.HDR"
GET "EFTP.HDR"
GET "DLIB.HDR"

//
LET START() BE
//
[
LET ZONE = NIL
LET REGION = NIL
LET CTX = NIL
LET CTXQ = NIL
LET STKSIZE = 300
LET ZONESIZE = #14000
ZONE := GETFIXED(ZONESIZE)
INITIALIZEZONE(ZONE,ZONESIZE,0)
CTXQ := ALLOCATE(ZONE,2)
CTXQ!0 := 0
INITPUPLEVEL1(ZONE,CTXQ,10,0)
INITEFTPPACKAGE()
REGION := ALLOCATE(ZONE,STKSIZE)
CTX := INITIALIZECONTEXT(REGION,STKSIZE,EFTPDRIVER,2)
ENQUEUE(CTXQ,CTX)
CTX!3 := -1
CTX!4 := ZONE
CALLCONTEXTLIST(CTXQ!0) REPEATUNTIL CTX!3 EQ 0
INITETHERIO()
]

//
AND EFTPDRIVER(CTX) BE
//
[
LET INSTRING =  VEC 40
WRITESTRING("EFTP --- ENTER S, R, OR Q")
GETSTRING(INSTRING)
BLOCK()
SWITCHON ((INSTRING!0 & #177400) RSHIFT 8) INTO
    [
    CASE 'Q':
        [
        CTX!3 := 0
        BLOCK() REPEAT
        ]
    CASE 'R':
        [
        LET NETID = NIL
        LET HOSTID = NIL
        LET RESULT = NIL
        LET STATUS = NIL
        LET CODE = NIL
        LET CHAN = NIL
        LET BLKID = 0
        LET RCVSOC =  VEC LENEFTPSOC
        LET MYPORT = VEC LENPORT
        LET RCVPORT = VEC LENPORT
        LET BUFFER = ALLOCATE(CTX!4,256)
        WRITESTRING("RECEIVE FILE --- ENTER HOST ID")
        GETSTRING(INSTRING)
        RESULT := PARSE(INSTRING,LV NETID,LV HOSTID)
        TEST NOT RESULT
          THEN
            [
            WRITESTRING("UNABLE TO PARSE HOST ID")
            ]
          OR
            [PARSE
        WRITESTRING("ENTER FILE NAME")
        GETSTRING(INSTRING)
        CHAN := OPEN(0,INSTRING,#40000)
        SWITCHON CHAN GE 0 INTO
            [CASEBLOCK
            CASE FALSE:
            [FALSE
            TEST CHAN EQ -2
                THEN
                [
                LET YES = VEC 40
                WRITESTRING("FILE EXISTS --- OK TO OVERWRITE?")
                GETSTRING(YES)
                TEST ((YES!0 & #177400) RSHIFT 8) EQ 'Y'
                    THEN
                    [

                    CHAN := OPEN(1,INSTRING,#40000)
                    IF CHAN LS 0 THEN
                        [
                        WRITESTRING("UNABLE TO OPEN FILE")
                        ENDCASE
                        ]
                    ]
                    OR
                    [
                    WRITESTRING("ABORTED BY OPERATOR")
                    ENDCASE
                    ]
                ]
                OR
                [
                WRITESTRING("UNABLE TO OPEN FILE")
                ENDCASE
                ]
            ]FALSE
            CASE TRUE:
            [TRUE
            MYPORT!0, MYPORT!1, MYPORT!2 := 0,0,SOCKETEFTPRECEIVE
            RCVPORT!0, RCVPORT!1, RCVPORT!2 := (NETID LSHIFT 8)+HOSTID,0,0
            BLOCK()
            OPENEFTPSOC(RCVSOC,MYPORT,RCVPORT)
                [
		LET WDCNT = NIL
                CODE := RECEIVEEFTPBLOCK(RCVSOC,BUFFER,-1)
                IF CODE LS 0 THEN
                    [
                    WRITESTRING("TRANSMISSION ABORTED")
                    BREAK
                    ]
                IF CODE EQ 0 THEN
                    [
                    WRITESTRING("FILE RECEIVED SUCCESSFULLY")
                    BREAK
                    ]

		FOR I = 0 TO 255 DO
		    [
		    BUFFER!I := ((BUFFER!I & #377) LSHIFT 8) +
			((BUFFER!I & #177400) RSHIFT 8)
		    ]
		WDCNT := (CODE+1) RSHIFT 1
		IF (CODE & #1) NE 0 THEN
		    [
		    BUFFER!(WDCNT-1) := BUFFER!(WDCNT-1) & #377
		    ]
                STATUS := WRITEDISK(CHAN,BUFFER,WDCNT,BLKID)
                IF STATUS NE -1 THEN
                    [
                    WRITESTRING("FILE WRITE ERROR")
                    BREAK
                    ]
                BLKID := BLKID+1
                ] REPEAT
            CLOSEEFTPSOC(RCVSOC)
            CLOSE(CHAN)
            ]TRUE
            ]CASEBLOCK
        ]PARSE
        FREE(CTX!4,BUFFER)
        ENDCASE
        ]
    CASE 'S':
        [
        LET NETID = NIL
        LET HOSTID = NIL
        LET RESULT = NIL
        LET STATUS = NIL
        LET CODE = NIL
        LET CHAN = NIL
        LET BLKID = 0
        LET SNDSOC =  VEC LENEFTPSOC
        LET SNDPORT = VEC LENPORT
        LET BUFFER = ALLOCATE(CTX!4,256)
        WRITESTRING("SEND FILE --- ENTER HOST ID")
        GETSTRING(INSTRING)
        RESULT := PARSE(INSTRING,LV NETID,LV HOSTID)
        TEST NOT RESULT
          THEN
            [
            WRITESTRING("UNABLE TO PARSE HOST ID")
            ]
          OR
            [PARSEOK
        WRITESTRING("ENTER FILE NAME")
        GETSTRING(INSTRING)
        CHAN := OPEN(-1,INSTRING,#40000)
        TEST CHAN LS 0
          THEN
            [
            WRITESTRING("UNABLE TO OPEN FILE")
            ]
          OR
            [OPENOK
        SNDPORT!0, SNDPORT!1, SNDPORT!2
                := (NETID LSHIFT 8)+HOSTID,0,SOCKETEFTPRECEIVE
        BLOCK()
        OPENEFTPSOC(SNDSOC,0,SNDPORT)
            [
            STATUS := READDISK(CHAN,BUFFER,1,BLKID)
            IF STATUS NE -1 THEN
                [
                TEST STATUS EQ 0
                    THEN
                    [
                    CODE := SENDEFTPEND(SNDSOC,-1)
                    WRITESTRING("FILE SUCCESSFULLY SENT")
                    BREAK
                    ]
                    OR
                    [
                    WRITESTRING("FILE READ ERROR")
                    BREAK
                    ]
                ]
	    FOR I = 0 TO 255 DO
		[
		BUFFER!I := ((BUFFER!I & #377) LSHIFT 8) +
		    ((BUFFER!I & #177400) RSHIFT 8)
		]
            CODE := SENDEFTPBLOCK(SNDSOC,BUFFER,512,-1)
            IF CODE LE 0 THEN
                [
                WRITESTRING("TRANSMISSION ABORTED")
                BREAK
                ]
            BLKID := BLKID+1
            ] REPEAT
        CLOSEEFTPSOC(SNDSOC)
        CLOSE(CHAN)
            ]OPENOK
            ]PARSEOK
        FREE(CTX!4,BUFFER)
        ENDCASE
        ]
    ]
]

//
AND PARSE(INSTRING,LVNETID,LVHOSTID) = VALOF
//
[
LET CHAR = NIL
LET I = 0
LET J = 1
LET NUM = 0
LET LB = 1
LET INCNT = INSTRING!0 & #377
RV LVNETID := 0
RV LVHOSTID := 0
    [
    SWITCHON (J & #1) INTO
        [
        CASE 0:
            [
            CHAR := INSTRING!I & #377
            ENDCASE
            ]
        CASE 1:
            [
            CHAR := (INSTRING!I 𫓸) RSHIFT 8
            I := I+1
            EN@CASE
            ]
        ]
    SWITCHON CHAR INTO
        [
        CASE '#':
            [
            IF INCNT EQ J THEN
                [
                RV LVHOSTID := NUM
                RESULTIS TRUE
                ]
            TEST LB EQ 1
                THEN
                [
                LB := 2
                RV LVNETID := NUM
                NUM := 0
                J := J+1
                ]
                OR
                [
                RESULTIS FALSE
                ]
            ENDCASE
            ]
        CASE '1':CASE '2':CASE '3':CASE '4':
        CASE '5':CASE '6':CASE '7':CASE '0':
            [
            IF INCNT EQ J THEN RESULTIS FALSE
            NUM := (NUM LSHIFT 3)+(CHAR & #7)
            J := J+1
            ENDCASE
            ]
        DEFAULT:
            [
            RESULTIS FALSE
            ]
        ]
    ] REPEAT
]