A2osX/LIB/LIBTCPIP.S.SKT.txt

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PREFIX /A2OSX.BUILD
AUTO 4,1
				.LIST OFF	
*/--------------------------------------
* # Socket
* Create a new socket
* ## C
* `hFD socket(short int type, short int protocol);`
* ## ASM
* **In:**
* `>PUSHB protocol`
* `lda type`
* `>LIBCALL hLIBTCPIP,LIBTCPIP.socket`
* ## RETURN VALUE
* CC: A = hSOCKET
* CS: A = EC
*\--------------------------------------
SKT.Socket		tax						type (RAW,DGRAM,SEQPACKET,STREAM)
				
				>PULLA					get protocol (RAW)
				
SKT.Socket.I	jmp (J.SKT.Socket,x)
				
SKT.Socket.RAW	ldy #S.SOCKET			socket.size
				bra SKT.Socket.DSOCK
SKT.Socket.DGRAM
				lda #S.IP.PROTOCOL.UDP
				ldy #S.SOCKET			socket.size
				bra SKT.Socket.DSOCK
SKT.Socket.SEQPACKET
				lda #S.IP.PROTOCOL.TCP
				ldy #S.SOCKET.TCP		socket.size
				
SKT.Socket.DSOCK
				stx FD.DSOCK+S.SOCKET.T		save type
				sta FD.DSOCK+S.SOCKET.PROTO		ICMP,UDP,TCP
				lda #0					Y = socket.size
				>SYSCALL GetMem0
				bcs .9
				>STYA ZPTmpPtr1
				stx FD.DSOCK+S.FD.DSOCK.HSKT
				
				jsr SKT.Socket.FindFree
				bcs .9

				ldy #FD.DSOCK.SIZE-1
				
.1				lda FD.DSOCK,y
				sta (ZPTmpPtr1),y
				dey
				bpl .1
				
				txa
				clc
.9				rts
				
SKT.Socket.STREAM
				lda #S.IP.PROTOCOL.TCP
				ldy #S.SOCKET.TCP

				stx FD.SSOCK+S.SOCKET.T		save type
				sta FD.SSOCK+S.SOCKET.PROTO		ICMP,UDP,TCP
				lda #0					Y = socket.size
				>SYSCALL GetMem0
				bcs .9
				>STYA ZPTmpPtr1
				stx FD.SSOCK+S.FD.SSOCK.HSKT

				jsr SKT.Socket.FindFree
				bcs .9
					
				ldy #FD.SSOCK.SIZE-1
				
.1				lda FD.SSOCK,y
				sta (ZPTmpPtr1),y
				dey
				bpl .1
				
				txa
				clc
.9				rts			

SKT.Socket.FindFree
				ldy #0
				
.1				lda SKT.TABLE,y
				beq .2
				iny
				cpy #K.SKTTABLE.SIZE
				bne .1
				
				txa
				>SYSCALL freemem
				lda #E.OOH
				sec
				rts

.2				txa						x = hFD
				sta SKT.TABLE,y
				clc
				rts
*/--------------------------------------
* # Bind
* bind a name to a socket
* ## C
* `int bind(hFD fd, const struct sockaddr *addr);`
* ## ASM
* **In:**
* `>PUSHW addr`
* `lda fd`
* `>LIBCALL hLIBTCPIP,LIBTCPIP.socket`
* ## RETURN VALUE
* CC: A = hSOCKET
* CS: A = EC
*\--------------------------------------
SKT.bind		>SYSCALL GetMemPtr
				>STYA ZPPtrSKT

				jsr SKT.PullLocAddr
				
				lda SKT.LOC.ADDR+S.SOCKADDR.PORT
				bne .1
				ldx SKT.LOC.ADDR+S.SOCKADDR.PORT+1
				bne .1
				
				jsr GetDynPort
				
				sta SKT.LOC.ADDR+S.SOCKADDR.PORT
				stx SKT.LOC.ADDR+S.SOCKADDR.PORT+1
				
.1				jsr SKT.FindMatchingLoc
				bcc .9
				
				jsr SKT.SetLocAddr

				clc
				rts

.9				lda #ERR.SKT.BUSY
				sec
				rts
*/--------------------------------------
* # Connect
* Iinitiate a connection on a socket
* ## C
* `int connect(hFD fd, const struct sockaddr *addr);`
* ## ASM
* **In:**
* `>PUSHW addr`
* `lda fd`
* `>LIBCALL hLIBTCPIP,LIBTCPIP.socket`
* ## RETURN VALUE
* CC: A = hSOCKET
* CS: A = EC
*\--------------------------------------
SKT.connect		>SYSCALL GetMemPtr
				>STYA ZPPtrSKT

				jsr SKT.PullRemAddr
				
				ldy #S.SOCKET.T
				lda (ZPPtrSKT),y
				tax
				jmp (J.SKT.connect,x)

SKT.connect.RAW
SKT.connect.DGRAM

				jsr SKT.SetRemAddr

				clc
				rts

SKT.connect.STREAM
				>LDYAI K.TCP.WSIZE
				>SYSCALL getmem
				bcs SKT.connect.99
				txa

				ldy #S.SOCKET.SQ.hInMem
				sta (ZPPtrSKT),y

				>LDYAI K.TCP.WSIZE
				>SYSCALL getmem
				bcs SKT.connect.99
				txa

				ldy #S.SOCKET.SQ.hOutMem
				sta (ZPPtrSKT),y

SKT.connect.SEQPACKET
				ldy #S.SOCKET.TCP.S
				lda (ZPPtrSKT),y
				bne SKT.connect.9

				jsr SKT.SetRemAddr
				
				lda #K.TCP.WSIZE
				ldy #S.SOCKET.TCP.INFREE
				sta (ZPPtrSKT),y
				ldy #S.SOCKET.TCP.OUTFREE
				sta (ZPPtrSKT),y

				lda /K.TCP.WSIZE
				ldy #S.SOCKET.TCP.INFREE
				sta (ZPPtrSKT),y
				ldy #S.SOCKET.TCP.OUTFREE
				sta (ZPPtrSKT),y

				ldy #S.SOCKET.TCP.OUTNEXTSEQ

.2				lda A2osX.TIMER16-S.SOCKET.TCP.OUTNEXTSEQ,y
				sta (ZPPtrSKT),y
				iny
				cpy #S.SOCKET.TCP.OUTNEXTSEQ+4
				bne .2

				lda #S.TCP.OPTIONS.SYN
				jsr TCP.OUT.SendOptA	Send SYN
				bcs .9

				ldy #S.SOCKET.TCP.S
				lda #S.SOCKET.TCP.S.SYNSENT
				sta (ZPPtrSKT),y

				clc
.9				rts

SKT.connect.9	lda #ERR.SKT.BAD
				sec
SKT.connect.99	rts				
*/--------------------------------------
* # Listen
* Listen for connections on a socket
* ## C
* `int listen(hFD fd);`
* ## ASM
* **In:**
* `lda fd`
* `>LIBCALL hLIBTCPIP,LIBTCPIP.listen`
* ## RETURN VALUE
* CS: A = EC
*\--------------------------------------
SKT.listen		>SYSCALL GetMemPtr
				>STYA ZPPtrSKT

				ldy #S.SOCKET.T
				lda (ZPPtrSKT),y
				cmp #S.SOCKET.T.SEQPACKET+1
				bcc .9

				ldy #S.SOCKET.TCP.S
				lda (ZPPtrSKT),y
				bne .9

				lda #S.SOCKET.TCP.S.LISTEN
				sta (ZPPtrSKT),y

				ldy #S.SOCKET.O
				lda #S.SOCKET.O.ACCEPTCONN
				sta (ZPPtrSKT),y

				clc
				rts

.9				lda #ERR.SKT.BAD
				sec
				rts				
*/--------------------------------------
* # Accept
* Accept a connection on a socket
* ## C
* `hFD Accept(hFD fd);`
* ## ASM
* **In:** 
* `lda fd`
* `>LIBCALL hLIBTCPIP,LIBTCPIP.accept`
* ## RETURN VALUE 
* A = hSocket
*\--------------------------------------
SKT.Accept		>SYSCALL GetMemPtr
				>STYA ZPPtrSKT

				ldy #S.SOCKET.O
				lda (ZPPtrSKT),y
				and #S.SOCKET.O.ACCEPTCONN
				beq .99

				ldy #S.SOCKET.HQ.TAIL
				lda (ZPPtrSKT),y
				ldy #S.SOCKET.HQ.HEAD
				cmp (ZPPtrSKT),y		Queue Empty
				beq .9					CS

				pha						save tail...
				inc
				cmp #S.SOCKET.HQ.MAX
				bne .1

				lda #0

.1				ldy #S.SOCKET.HQ.TAIL
				sta (ZPPtrSKT),y
				pla
				clc
				adc #S.SOCKET.HQ
				tay
				lda (ZPPtrSKT),y
				clc
				rts

.99				lda #ERR.SKT.BAD
				sec
.9				rts
*/--------------------------------------
* # Shutdown
* Close socket
* ## C
* `int shutdown(int fd);`
* ## ASM
* **In:**
* `lda fd`
* `>LIBCALL hLIBTCPIP,LIBTCPIP.shutdown`
* ## RETURN VALUE
*\--------------------------------------
SKT.shutdown	>SYSCALL GetMemPtr
				>STYA ZPPtrSKT

				cmp #S.SOCKET.T.STREAM
				beq .10					TCP
				cmp #S.SOCKET.T.RAW+1
				bcs .9					no #S.SOCKET.T.DGRAM, nor #S.SOCKET.T.RAW

.1				ldy #S.SOCKET.HQ.TAIL
				lda (ZPPtrSKT),y
				ldy #S.SOCKET.HQ.HEAD
				cmp (ZPPtrSKT),y
				beq .8					No frame in Queue, close..

				pha						save tail...
				clc
				adc #S.SOCKET.HQ
				tax
				pla
				inc
				cmp #S.SOCKET.HQ.MAX
				beq .2

				lda #0

.2				ldy #S.SOCKET.HQ.TAIL
				sta (ZPPtrSKT),y

				txa
				tay
				lda (ZPPtrSKT),y
				>SYSCALL FreeMem
				bra .1

.8				lda #0
				sta (ZPPtrSKT)
				clc
				rts

.9				lda #ERR.SKT.BAD
				sec
.99				rts
						
.10				ldy #S.SOCKET.O
				lda (ZPPtrSKT),y
				bit #S.SOCKET.O.ACCEPTCONN

				bne *					TO DO: Listening socket

				ldy #S.SOCKET.TCP.S
				lda (ZPPtrSKT),y
				cmp #S.SOCKET.TCP.S.CLWAIT
				bne .11

				lda #S.SOCKET.TCP.S.LASTACK
				bra .12

.11				lda #S.SOCKET.TCP.S.FINWT1
.12				sta (ZPPtrSKT),y

				ldy #S.SOCKET.TCP.O
				lda (ZPPtrSKT),y
				ora #S.TCP.OPTIONS.FIN+S.TCP.OPTIONS.ACK
				sta (ZPPtrSKT),y
				
				jmp TCP.OUT				Try to push FIN/ACK			
*/--------------------------------------
* # Read (STREAM)
* ## C
* `int skt.read(hFD fd, void *buf, int count);`
* ## ASM
* **In:**
* `>PUSHWI count`
* `>PUSHW buf`
* `lda fd`
* `>LIBCALL hLIBTCPIP,LIBTCPIP.skt.read`
* ## RETURN VALUE
* CC: Y,A = bytes read
* CS: A = EC
*\--------------------------------------
SKT.Read 		>SYSCALL GetMemPtr
				>STYA ZPPtrSKT

				>PULLW ZPDataInPtr		!!!DataOut trashed when sending ACK in TCP.OUT	
				>PULLW ZPDataInLen		!!!use DataInPtr/Len

				ldy #S.SOCKET.T
				lda (ZPPtrSKT),y
				cmp #S.SOCKET.T.STREAM
				bne .90					bad skt

				ldy #S.SOCKET.O
				lda (ZPPtrSKT),y
				and #S.SOCKET.O.ACCEPTCONN
				bne .90					Bad Skt

				ldy #S.SOCKET.TCP.S
				lda (ZPPtrSKT),y
				cmp #S.SOCKET.TCP.S.ESTBLSH
				bcc .92					Not yet established...no data
				cmp #S.SOCKET.TCP.S.FINWT2
				bcs .91					closing...IO err

				jsr SKT.GetDataFromSktIn
				rts						if CS, No data...

.90				lda #ERR.SKT.BAD
				sec
				rts

.91				lda #MLI.E.IO
				sec
				rts

.92				lda #0
				sec
.99				rts
*/--------------------------------------
* # Write (STREAM)
* ## C
* `int skt.write(hFD fd, const void *buf, int count);`
* ## ASM
* **In:**
* `>PUSHWI count`
* `>PUSHW buf`
* `lda fd`
* `>LIBCALL hLIBTCPIP,LIBTCPIP.skt.write`
* ## RETURN VALUE
* CC: Y,A = bytes written
* CS: A = EC
*\--------------------------------------
SKT.Write		>SYSCALL GetMemPtr
				>STYA ZPPtrSKT

				>PULLW ZPDataInPtr
				>PULLW ZPDataInLen

				ldy #S.SOCKET.T
				lda (ZPPtrSKT),y
				cmp #S.SOCKET.T.STREAM
				bne .99

				ldy #S.SOCKET.O
				lda (ZPPtrSKT),y
				and #S.SOCKET.O.ACCEPTCONN
				bne .99

				ldy #S.SOCKET.TCP.S	
				lda (ZPPtrSKT),y
				cmp #S.SOCKET.TCP.S.ESTBLSH
				bne .91

				jsr SKT.AddDataToSktOut   will call SKT.GetTCB 
				bcs .90

				jsr TCP.OUT.I			SKT.GetTCB called, try to push, ignore error....
				clc
				rts

.90				lda #0					no data transfered
				sec
				rts

.91				lda #MLI.E.IO
				sec
				rts

.99				lda #ERR.SKT.BAD
				sec
				rts
*/--------------------------------------
* # Recv (RAW,DGRAM,SEQPACKET)
* # RecvFrom (RAW,DGRAM,SEQPACKET)
* ## C
* `hMem recv(hFD fd);`
* `hMem recvfrom(hFD fd, struct sockaddr *addr);`
* ## ASM
* **In:**
* `>PUSHW addr`		(RecvFrom)
* `lda fd`
* `>LIBCALL hLIBTCPIP,LIBTCPIP.skt.Recv`
* ## RETURN VALUE
* CC: A = hMem
* CS: A = EC
*\--------------------------------------
SKT.RecvFrom	sec
				.HS 90					BCC
SKT.Recv		clc
				php

				>SYSCALL GetMemPtr
				>STYA ZPPtrSKT

				ldy #S.SOCKET.T
				lda (ZPPtrSKT),y
				cmp #S.SOCKET.T.STREAM
				beq .99

				ldy #S.SOCKET.HQ.TAIL
				lda (ZPPtrSKT),y
				tax

				ldy #S.SOCKET.HQ.HEAD
				cmp (ZPPtrSKT),y
				beq .90

				inc
				cmp #S.SOCKET.HQ.MAX
				bne .1
				lda #0

.1				ldy #S.SOCKET.HQ.TAIL
				sta	(ZPPtrSKT),y

				txa
				clc
				adc #S.SOCKET.HQ
				tay
				lda (ZPPtrSKT),y
				plp
				bcc .9
				pha
				>SYSCALL GetMemPtr
				>STYA ZPFrameInPtr

				>PULLW ZPTmpPtr1	addr

				ldy #S.IP.SRC

.2				lda (ZPFrameInPtr),y
				sta SA.REMOTE+S.SOCKADDR.ADDR-S.IP.SRC,y
				iny
				cpy #S.IP.SRC+4
				bne .2

				ldy #S.IP.PROTOCOL
				lda (ZPFrameInPtr),y
				cmp #S.IP.PROTOCOL.ICMP
				bne .3

				ldy #S.ICMP.IDENTIFIER
				bra .7

.3				cmp #S.IP.PROTOCOL.TCP
				beq .6
				cmp #S.IP.PROTOCOL.UDP
				bne .8

.6				ldy #S.TCPUDP.SRCPORT

.7				lda (ZPFrameInPtr),y
				sta SA.REMOTE+S.SOCKADDR+1
				iny
				lda (ZPFrameInPtr),y
				sta SA.REMOTE+S.SOCKADDR

.8				lda #S.SOCKADDR-1

.80				lda SA.REMOTE,y
				sta (ZPTmpPtr1),y
				dey
				bpl .80

				pla
				clc
.9				rts

.99				plp
				lda #ERR.SKT.BAD
				sec
				rts				

.90				plp
				lda #0					no data
				sec
				rts
*/--------------------------------------
* # Send (RAW,DGRAM,SEQPACKET)
* # SendTo (RAW,DGRAM,SEQPACKET)
* ## C
* `int skt.send(hFD fd, const void *buf, int count);`
* `int skt.sendto(hFD fd, const void *buf, int count, const struct sockaddr *addr);`
* ## ASM
* **In:**
* `>PUSHW addr`		(SendTo)
* `>PUSHWI count`
* `>PUSHW buf`
* `lda fd`
* `>LIBCALL hLIBTCPIP,LIBTCPIP.skt.send`
* ## RETURN VALUE
* CC: Y,A = bytes written
* CS: A = EC
*\--------------------------------------
SKT.SendTo		sec
				.HS 90					BCC
SKT.Send		clc
				php
				>SYSCALL GetMemPtr
				>STYA ZPPtrSKT
				plp

				bcc .1

				jsr SKT.PullRemAddr

.1				>PULLW ZPDataInPtr
				>PULLW ZPDataInLen

				ldy #S.SOCKET.T
				lda (ZPPtrSKT),y
				tax
				jmp (J.SKT.send,x)		
*--------------------------------------
SKT.Send.RAW	ldy #S.SOCKET.PROTO
				lda (ZPPtrSKT),y

				tax
				>LDYA ZPDataInLen
				jsr FRM.NewIP
				bcs SKT.Send.9
				
				bra SKT.Send.DGRAM.8
*--------------------------------------
SKT.Send.DGRAM	ldx #S.IP.PROTOCOL.UDP
				>LDYA ZPDataInLen
				jsr FRM.NewIP
				bcs SKT.Send.9
				
				jsr SKT.SetFrameOutTCPUDPPorts
				
SKT.Send.DGRAM.8

				jsr SKT.SetFrameOutDstIP
				
				jsr SKT.CopyDataInToOut				

				jmp FRM.SendIP
*--------------------------------------
SKT.Send.STREAM	lda #ERR.SKT.BAD
				sec
SKT.Send.9		rts
*--------------------------------------
SKT.Send.SEQPACKET
				bra *
*/--------------------------------------
* # GetTable
* Get socket table
* ## C
* `void * gettable();`
* ## ASM
* **In:**
* `>LIBCALL hLIBTCPIP,LIBTCPIP.skt.GetTable`
* ## RETURN VALUE
*\--------------------------------------
SKT.GetTable	>LDYA L.SKT.Table
				clc
				rts
*--------------------------------------
*  PRIVATE
*--------------------------------------				
SKT.PullLocAddr	>PULLW ZPTmpPtr1
				
				ldy #S.SOCKADDR-1
				
.1				lda (ZPTmpPtr1),y
				sta SKT.LOC.ADDR,y
				dey
				bpl .1
				rts
*--------------------------------------				
SKT.PullRemAddr	>PULLW ZPTmpPtr1
				
				ldy #S.SOCKADDR-1
				
.1				lda (ZPTmpPtr1),y
				sta SKT.REM.ADDR,y
				dey
				bpl .1
				rts
*--------------------------------------
SKT.SetLocAddr	ldy #S.SOCKET.LOC.ADDR
				
.1				lda SKT.LOC.ADDR+S.SOCKADDR.ADDR-S.SOCKET.LOC.ADDR,y
				sta (ZPPtrSKT),y
				iny
				cpy #S.SOCKET.LOC.PORT+2
				bne .1
				rts
*--------------------------------------
SKT.SetRemAddr	ldy #S.SOCKET.REM.ADDR
				
.1				lda SKT.REM.ADDR+S.SOCKADDR.ADDR-S.SOCKET.REM.ADDR,y
				sta (ZPPtrSKT),y
				iny
				cpy #S.SOCKET.REM.PORT+2
				bne .1
				rts
*--------------------------------------
SKT.FindMatchingLocRem
				ldx #0
				
.1				lda SKT.TABLE,x
				beq .8
				
				phx
				>SYSCALL GetMemPtr
				>STYA ZPTmpPtr1
				plx
				
				ldy #0
				
.2				lda (ZPTmpPtr1),y
				bne .4
				
				ldy #S.SOCKET.LOC.PORT	This Socket is bound to 0.0.0.0,check only LOC port

.3				lda (ZPTmpPtr1),y
	
.4				cmp SKT.LOC.ADDR+S.SOCKADDR.ADDR-S.SOCKET.LOC.ADDR,y
				bne .8
				iny
				cpy #S.SOCKET.REM.ADDR
				bne .3
				
				lda SKT.REM.ADDR+S.SOCKADDR.ADDR
				cmp #$ff				FF.FF.FF.FF, Broadcast ?
				bne .5
				
				ldy #S.SOCKET.O
				lda (ZPTmpPtr1),y
				and #S.SOCKET.O.BROADCAST
				beq .9					this socket does not accept broadcast

				ldy #S.SOCKET.REM.PORT	Boradcast, check port only
				
.5				lda (ZPTmpPtr1),y		
				cmp SKT.REM.ADDR+S.SOCKADDR.ADDR-S.SOCKET.REM.ADDR,y
				bne .9					wrong remote host, exit....
				iny
				cpy #S.SOCKET.REM.PORT+2
				bne .5

				>LDYA ZPTmpPtr1			x = SKT.TABLE index
				clc
				rts
				
.8				inx
				cpx #K.SKTTABLE.SIZE
				bne .1
				
.9				sec
			
				rts
*--------------------------------------
SKT.FindMatchingLoc

				ldy #S.SOCKET.LOC.PORT+1
				phy
				
				ldx #0
				
.1				lda SKT.TABLE,x
				beq .7
				
				phx
				>SYSCALL GetMemPtr
				>STYA ZPTmpPtr1
				plx
				
				ply
				phy
				
.2				lda (ZPTmpPtr1),y
				cmp SKT.LOC.ADDR+S.SOCKADDR.ADDR-S.SOCKET.LOC.ADDR,y
				bne .7
				dey
				cpy #S.SOCKET.LOC.ADDR-1
				bne .2
				
				ply
				
				>LDYA ZPTmpPtr1			x = SKT.TABLE index
				clc
				rts
				
.7				inx
				cpx #K.SKTTABLE.SIZE
				bne .1
				
				ply
				
*				sec
			
.9				rts
*--------------------------------------
* ZPPtrSKT -> actual socket
* A = hSocket or hFrame
*--------------------------------------
SKT.AddToQueueA sta .2+1
				ldy #S.SOCKET.HQ.HEAD
				lda (ZPPtrSKT),y
				tax
				inc 
				cmp #S.SOCKET.HQ.MAX
				bne .1
				lda #0
				
.1				ldy #S.SOCKET.HQ.TAIL
				cmp (ZPPtrSKT),y
				beq .9					Queue full!!
				
				ldy #S.SOCKET.HQ.HEAD
				sta (ZPPtrSKT),y
				txa
				clc
				adc #S.SOCKET.HQ
				tay
				
.2				lda #$ff
				sta (ZPPtrSKT),y
				clc
				rts
				
.9				sec
				rts
*--------------------------------------
* From TCP.IN
* Src : ZPDataInPtr/ZPDataInLen
* Dst : hInMem/INHEAD
*--------------------------------------
SKT.AddDataToSktIn
				ldx SKT.TmpCache+S.SOCKET.TCP.INFREE
				cpx ZPDataInLen
				lda SKT.TmpCache+S.SOCKET.TCP.INFREE+1
				sbc ZPDataInLen+1
				bcc .9					Not enough room in Q
				
				ldy #S.TCP.SEQNUM+3
				ldx #3

.10				lda (ZPFrameInPtr),y
				eor SKT.TmpCache+S.SOCKET.TCP.INLASTSEQNUM,x
				bne .9
				dey
				dex
				bpl .10
				
				ldy #S.SOCKET.SQ.hInMem
				lda (ZPPtrSKT),y
				>SYSCALL GetMemPtr
				>STYA ZPTmpPtr1			Make ZPTmpPtr1=buffer base

				lda ZPTmpPtr1
				clc
				adc SKT.TmpCache+S.SOCKET.TCP.INHEAD
				sta ZPTmpPtr2

				lda ZPTmpPtr1+1
				adc SKT.TmpCache+S.SOCKET.TCP.INHEAD+1
				sta ZPTmpPtr2+1			Make ZPTmpPtr2=base+Tail
				
				lda ZPDataInLen
				eor #$FF
				tax
				
				lda ZPDataInLen+1
				eor #$FF
				pha
				
				ldy #0

.1				inx
				bne .2
				pla
				inc
				beq .8
				
				pha
				
.2				lda (ZPDataInPtr),y
				sta (ZPTmpPtr2)
				iny
				bne .3
				inc ZPDataInPtr+1

.3				inc ZPTmpPtr2
				bne .4
				inc ZPTmpPtr2+1
				
.4				inc SKT.TmpCache+S.SOCKET.TCP.INHEAD
				bne .1
				inc SKT.TmpCache+S.SOCKET.TCP.INHEAD+1
				lda SKT.TmpCache+S.SOCKET.TCP.INHEAD+1
				cmp /K.TCP.WSIZE
				bne .1
				stz SKT.TmpCache+S.SOCKET.TCP.INHEAD+1
				
				lda ZPTmpPtr1			Dst Ptr=Buffer Base
				sta ZPTmpPtr2
				lda ZPTmpPtr1+1
				sta ZPTmpPtr2+1
				bra .1

.9				sec
				rts
				
.8				lda SKT.TmpCache+S.SOCKET.TCP.INFREE
				sec 
				sbc ZPDataInLen
				sta SKT.TmpCache+S.SOCKET.TCP.INFREE
				
				lda SKT.TmpCache+S.SOCKET.TCP.INFREE+1
				sbc ZPDataInLen+1
				sta SKT.TmpCache+S.SOCKET.TCP.INFREE+1
				
				lda SKT.TmpCache+S.SOCKET.TCP.INUSED
				clc 
				adc ZPDataInLen
				sta SKT.TmpCache+S.SOCKET.TCP.INUSED
				
				lda SKT.TmpCache+S.SOCKET.TCP.INUSED+1
				adc ZPDataInLen+1
				sta SKT.TmpCache+S.SOCKET.TCP.INUSED+1
			
				clc
				
				lda SKT.TmpCache+S.SOCKET.TCP.INLASTSEQNUM+3
				adc ZPDataInLen
				sta SKT.TmpCache+S.SOCKET.TCP.INLASTSEQNUM+3
				
				lda SKT.TmpCache+S.SOCKET.TCP.INLASTSEQNUM+2
				adc ZPDataInLen+1
				sta SKT.TmpCache+S.SOCKET.TCP.INLASTSEQNUM+2
				bcc .80
				inc SKT.TmpCache+S.SOCKET.TCP.INLASTSEQNUM+1
				bne .80
				inc SKT.TmpCache+S.SOCKET.TCP.INLASTSEQNUM

.80				clc
				rts
*--------------------------------------
* From SKT.Read
* In:
*  Src : hInMem/INTAIL
*  Dst : ZPDataOutPtr/ZPDataOutLen
* Out:
*  Y,A = bytes read
*--------------------------------------
SKT.GetDataFromSktIn
				jsr SKT.GetTCB
				lda SKT.TmpCache+S.SOCKET.TCP.INUSED
				ora SKT.TmpCache+S.SOCKET.TCP.INUSED+1
				bne .10
				sec
				rts						A=0,NO DATA

.10				ldy #S.SOCKET.SQ.hInMem
				lda (ZPPtrSKT),y
				>SYSCALL GetMemPtr
				>STYA ZPTmpPtr1			Make ZPTmpPtr1=buffer base

				lda ZPTmpPtr1
				clc
				adc SKT.TmpCache+S.SOCKET.TCP.INTAIL
				sta ZPTmpPtr2

				lda ZPTmpPtr1+1
				adc SKT.TmpCache+S.SOCKET.TCP.INTAIL+1
				sta ZPTmpPtr2+1
				
				lda ZPDataInLen
				eor #$FF
				tax
				
				lda ZPDataInLen+1
				eor #$FF
				pha
				
				stz ZPTmpPtr3			Reset byte counter
				stz ZPTmpPtr3+1
				
				ldy #0
				
.1				inx						Check if room left in dest buffer
				bne .2
				pla
				inc
				beq .8

				pha
				
.2				lda SKT.TmpCache+S.SOCKET.TCP.INTAIL
				eor SKT.TmpCache+S.SOCKET.TCP.INHEAD
				bne .3
				lda SKT.TmpCache+S.SOCKET.TCP.INTAIL+1
				eor SKT.TmpCache+S.SOCKET.TCP.INHEAD+1
				beq .7					no more data....
				
.3				lda (ZPTmpPtr2)
				pha
				
				inc SKT.TmpCache+S.SOCKET.TCP.INTAIL
				bne .4
				
				inc SKT.TmpCache+S.SOCKET.TCP.INTAIL+1
				lda SKT.TmpCache+S.SOCKET.TCP.INTAIL+1
				cmp /K.TCP.WSIZE
				bne .4
				
				stz SKT.TmpCache+S.SOCKET.TCP.INTAIL+1
				lda ZPTmpPtr1
				sta ZPTmpPtr2
				lda ZPTmpPtr1+1
				sta ZPTmpPtr2+1
				bra .5
				
.4				inc ZPTmpPtr2
				bne .5
				inc ZPTmpPtr2+1
				
.5				pla						get back data....
				
.6				sta (ZPDataInPtr),y
				iny
				bne .61
				inc ZPDataInPtr+1
				
.61				inc ZPTmpPtr3
				bne .1
				inc ZPTmpPtr3+1
				
				bra .1
				
.7				pla						discard byte counter HI

.8				lda ZPTmpPtr3			Do we have transfered something?
				ora ZPTmpPtr3+1
				beq .9
				
				lda SKT.TmpCache+S.SOCKET.TCP.INFREE
				clc
				adc ZPTmpPtr3
				sta SKT.TmpCache+S.SOCKET.TCP.INFREE
				
				lda SKT.TmpCache+S.SOCKET.TCP.INFREE+1
				adc ZPTmpPtr3+1
				sta SKT.TmpCache+S.SOCKET.TCP.INFREE+1

				lda SKT.TmpCache+S.SOCKET.TCP.INUSED
				sec
				sbc ZPTmpPtr3
				sta SKT.TmpCache+S.SOCKET.TCP.INUSED
				
				lda SKT.TmpCache+S.SOCKET.TCP.INUSED+1
				sbc ZPTmpPtr3+1
				sta SKT.TmpCache+S.SOCKET.TCP.INUSED+1

				lda SKT.TmpCache+S.SOCKET.TCP.OUTACKNUM+3
				clc 
				adc ZPTmpPtr3
				sta SKT.TmpCache+S.SOCKET.TCP.OUTACKNUM+3
				
				lda SKT.TmpCache+S.SOCKET.TCP.OUTACKNUM+2
				adc ZPTmpPtr3+1
				sta SKT.TmpCache+S.SOCKET.TCP.OUTACKNUM+2
				
				bcc .80
				inc SKT.TmpCache+S.SOCKET.TCP.OUTACKNUM+1
				bne .80
				inc SKT.TmpCache+S.SOCKET.TCP.OUTACKNUM
				
.80				jsr SKT.StoreTCB

				ldy #S.SOCKET.TCP.O
				lda (ZPPtrSKT),y
				ora #S.TCP.OPTIONS.ACK
				sta (ZPPtrSKT),y

				jsr TCP.OUT.I			SKT.GetTCB already called, Try to ACK read DATA
				
				>LDYA ZPTmpPtr3
				clc
				rts
				
.9				
*				lda #0					NO DATA
				sec
				rts
*--------------------------------------
* From SKT.Write.TCP
* Src : ZPDataInPtr/ZPDataInLen
* Dst : hOutMem/OUTHEAD
*--------------------------------------
SKT.AddDataToSktOut
				jsr SKT.GetTCB 
				ldx SKT.TmpCache+S.SOCKET.TCP.OUTFREE
				cpx ZPDataInLen
				lda SKT.TmpCache+S.SOCKET.TCP.OUTFREE+1
				sbc ZPDataInLen+1
				bcc .9					Not enough room in Q
				
				ldy #S.SOCKET.SQ.hOutMem
				lda (ZPPtrSKT),y
				>SYSCALL GetMemPtr
				>STYA ZPTmpPtr1			Make ZPTmpPtr1=buffer base

				lda ZPTmpPtr1
				clc
				adc SKT.TmpCache+S.SOCKET.TCP.OUTHEAD
				sta ZPTmpPtr2

				lda ZPTmpPtr1+1
				adc SKT.TmpCache+S.SOCKET.TCP.OUTHEAD+1
				sta ZPTmpPtr2+1			Make ZPTmpPtr2=base+Tail
				
				lda ZPDataInLen
				eor #$FF
				tax
				
				lda ZPDataInLen+1
				eor #$FF
				pha
				
				ldy #0

.1				inx
				bne .2
				pla
				inc
				beq .8
				
				pha
				
.2				lda (ZPDataInPtr),y
				sta (ZPTmpPtr2)
				iny
				bne .3
				inc ZPDataInPtr+1

.3				inc ZPTmpPtr2
				bne .4
				inc ZPTmpPtr2+1
				
.4				inc SKT.TmpCache+S.SOCKET.TCP.OUTHEAD
				bne .1
				inc SKT.TmpCache+S.SOCKET.TCP.OUTHEAD+1
				lda SKT.TmpCache+S.SOCKET.TCP.OUTHEAD+1
				cmp /K.TCP.WSIZE
				bne .1
				stz SKT.TmpCache+S.SOCKET.TCP.OUTHEAD+1
				
				lda ZPTmpPtr1			Dst Ptr=Buffer Base
				sta ZPTmpPtr2
				lda ZPTmpPtr1+1
				sta ZPTmpPtr2+1
				bra .1

.9				sec
				rts
				
.8				lda SKT.TmpCache+S.SOCKET.TCP.OUTFREE
				sec 
				sbc ZPDataInLen
				sta SKT.TmpCache+S.SOCKET.TCP.OUTFREE
				lda SKT.TmpCache+S.SOCKET.TCP.OUTFREE+1
				sbc ZPDataInLen+1
				sta SKT.TmpCache+S.SOCKET.TCP.OUTFREE+1
				
				lda SKT.TmpCache+S.SOCKET.TCP.OUTUSED
				clc 
				adc ZPDataInLen
				sta SKT.TmpCache+S.SOCKET.TCP.OUTUSED
				lda SKT.TmpCache+S.SOCKET.TCP.OUTUSED+1
				adc ZPDataInLen+1
				sta SKT.TmpCache+S.SOCKET.TCP.OUTUSED+1
			
				lda SKT.TmpCache+S.SOCKET.TCP.OUTTOSEND
				clc 
				adc ZPDataInLen
				sta SKT.TmpCache+S.SOCKET.TCP.OUTTOSEND
				lda SKT.TmpCache+S.SOCKET.TCP.OUTTOSEND+1
				adc ZPDataInLen+1
				sta SKT.TmpCache+S.SOCKET.TCP.OUTTOSEND+1
				jsr SKT.StoreTCB
				rts
*--------------------------------------
* From TCP.OUT
* Src : hOutMem/OUTTAIL
* Dst : ZPDataOutPtr/ZPDataOutLen
*--------------------------------------
SKT.GetDataFromSktOut
				ldy #S.SOCKET.SQ.hOutMem
				lda (ZPPtrSKT),y
				
				>SYSCALL GetMemPtr
				>STYA ZPTmpPtr1			Make ZPTmpPtr1=buffer base

				lda ZPTmpPtr1
				clc
				adc SKT.TmpCache+S.SOCKET.TCP.OUTTAILNEXT
				sta ZPTmpPtr2			Make ZPTmpPtr2=base+nexttail

				lda ZPTmpPtr1+1
				adc SKT.TmpCache+S.SOCKET.TCP.OUTTAILNEXT+1
				sta ZPTmpPtr2+1
				
				lda ZPDataOutLen
				eor #$FF
				tax
				
				lda ZPDataOutLen+1
				eor #$FF
				pha
				
				ldy #0

.1				inx
				bne .2
				pla
				inc
				beq .8
				
				pha
				
.2				lda (ZPTmpPtr2)
				sta (ZPDataOutPtr),y
				iny
				bne .3
				inc ZPDataOutPtr+1

.3				inc ZPTmpPtr2
				bne .4
				inc ZPTmpPtr2+1
				
.4				inc SKT.TmpCache+S.SOCKET.TCP.OUTTAILNEXT
				bne .1
				inc SKT.TmpCache+S.SOCKET.TCP.OUTTAILNEXT+1
				lda SKT.TmpCache+S.SOCKET.TCP.OUTTAILNEXT+1
				cmp /K.TCP.WSIZE
				bne .1
				stz SKT.TmpCache+S.SOCKET.TCP.OUTTAILNEXT+1
				
				lda ZPTmpPtr1			Dst Ptr=Buffer Base
				sta ZPTmpPtr2
				lda ZPTmpPtr1+1
				sta ZPTmpPtr2+1
				bra .1

.8				lda SKT.TmpCache+S.SOCKET.TCP.OUTTOSEND
				sec
				sbc ZPDataOutLen
				sta SKT.TmpCache+S.SOCKET.TCP.OUTTOSEND
				lda SKT.TmpCache+S.SOCKET.TCP.OUTTOSEND+1
				sbc ZPDataOutLen+1
				sta SKT.TmpCache+S.SOCKET.TCP.OUTTOSEND+1
				
				clc
				rts
*--------------------------------------
* From TCP.IN
* Src : A,X
* Dst : hOutMem/OUTTAIL
*--------------------------------------
SKT.AckDataToSktOut
				ldy #S.TCP.ACKNUM+3		Get new ACK number from FrameIn...
				ldx #3					Substract old ACK from socket

				sec

.1				lda (ZPFrameInPtr),y
				pha
				sbc SKT.TmpCache+S.SOCKET.TCP.OUTSEQNUM,x
				sta TmpDWord,x
				pla						....and Set SEQ = new SEQ
				sta SKT.TmpCache+S.SOCKET.TCP.OUTSEQNUM,x
				dey
				dex
				bpl .1
				
				lda TmpDWord+3
				ldx TmpDWord+2
				bne .2
				tay
				beq .8
				
.2				clc
				adc SKT.TmpCache+S.SOCKET.TCP.OUTTAIL
				sta SKT.TmpCache+S.SOCKET.TCP.OUTTAIL
				
				txa
				adc SKT.TmpCache+S.SOCKET.TCP.OUTTAIL+1
				and /K.TCP.WSIZE-1
				sta SKT.TmpCache+S.SOCKET.TCP.OUTTAIL+1

				lda SKT.TmpCache+S.SOCKET.TCP.OUTFREE
				clc
				adc TmpDWord+3
				sta SKT.TmpCache+S.SOCKET.TCP.OUTFREE
				lda SKT.TmpCache+S.SOCKET.TCP.OUTFREE+1
				adc TmpDWord+2
				sta SKT.TmpCache+S.SOCKET.TCP.OUTFREE+1
				
				lda SKT.TmpCache+S.SOCKET.TCP.OUTUSED
				sec
				sbc TmpDWord+3
				sta SKT.TmpCache+S.SOCKET.TCP.OUTUSED
				lda SKT.TmpCache+S.SOCKET.TCP.OUTUSED+1
				sbc TmpDWord+2
				sta SKT.TmpCache+S.SOCKET.TCP.OUTUSED+1
								
.8				rts
*--------------------------------------
SKT.GetTCB	 	ldy #S.SOCKET.TCP-S.SOCKET

.1				dey
				lda (ZPPtrSKT),y
				sta SKT.TmpCache,y
				cpy #S.SOCKET
				bne .1
				
				rts
*--------------------------------------
SKT.StoreTCB 	ldy #S.SOCKET.TCP-S.SOCKET

.1				dey
				lda SKT.TmpCache,y
				sta (ZPPtrSKT),y
				cpy #S.SOCKET
				bne .1
				
				rts
*--------------------------------------
SKT.Destroy		ldy #S.SOCKET.SQ.hOutMem
				lda (ZPPtrSKT),y
				beq .1
				>SYSCALL FreeMem
				
.1				ldy #S.SOCKET.SQ.hInMem
				lda (ZPPtrSKT),y
				beq .2
				>SYSCALL FreeMem
				
.2				lda #0
				sta (ZPPtrSKT)
				clc
				rts
*--------------------------------------
SKT.SetFrameOutDstIP
				ldy #S.SOCKET.REM.ADDR
				ldx #4
				
.1				lda (ZPPtrSKT),y
				pha
				iny
				dex
				bne .1
				
				ldy #S.IP.DST+3
				ldx #4
				
.2				pla
				sta (ZPFrameOutPtr),y
				dey
				dex
				bne .2
				rts
*--------------------------------------
SKT.SetFrameOutTCPUDPPorts
				ldy #S.SOCKET.LOC.PORT
				lda (ZPPtrSKT),y
				tax
				iny
				lda (ZPPtrSKT),y
 				ldy #S.TCPUDP.SRCPORT
				sta (ZPFrameOutPtr),y
				iny
				txa
				sta (ZPFrameOutPtr),y
				
				ldy #S.SOCKET.REM.PORT
				lda (ZPPtrSKT),y
				tax
				iny
				lda (ZPPtrSKT),y
 				ldy #S.TCPUDP.DSTPORT
				sta (ZPFrameOutPtr),y
				iny
				txa
				sta (ZPFrameOutPtr),y

				rts
*--------------------------------------
SKT.CopyDataInToOut
				lda ZPDataInPtr+1
				pha
				lda ZPDataOutPtr+1
				pha
				
				lda ZPDataInLen
				eor #$ff
				tax
				lda ZPDataInLen+1
				eor #$ff
				pha

				ldy #0
				
.1				inx
				bne .2
				pla
				inc
				beq .9
				pha

.2				lda (ZPDataInPtr),y
				sta (ZPDataOutPtr),y
				iny
				bne .1
				inc ZPDataInPtr+1
				inc ZPDataOutPtr+1
				bne .1
				
.9				pla
				sta ZPDataOutPtr+1
				pla
				sta ZPDataInPtr+1
				rts
*--------------------------------------
MAN
SAVE /A2OSX.SRC/LIB/LIBTCPIP.S.SKT
LOAD /A2OSX.SRC/LIB/LIBTCPIP.S
ASM