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authorYves Fischer <yvesf-git@xapek.org>2012-02-26 19:49:39 +0100
committerYves Fischer <yvesf-git@xapek.org>2012-02-26 19:49:39 +0100
commit36f42916cadd07bba5d0812566fba4546641cde9 (patch)
tree761cf941f01d36051e7582c9b863c44fffae5473 /ebus-racket/parser.rkt
parent0ebb35c9dbd4853924ec4124862eb26bc45b9f12 (diff)
downloadebus-alt-36f42916cadd07bba5d0812566fba4546641cde9.tar.gz
ebus-alt-36f42916cadd07bba5d0812566fba4546641cde9.zip
ebus-racked: rename to layer2-/layer7-
Diffstat (limited to 'ebus-racket/parser.rkt')
-rw-r--r--ebus-racket/parser.rkt100
1 files changed, 0 insertions, 100 deletions
diff --git a/ebus-racket/parser.rkt b/ebus-racket/parser.rkt
deleted file mode 100644
index 773e86e..0000000
--- a/ebus-racket/parser.rkt
+++ /dev/null
@@ -1,100 +0,0 @@
-#lang racket
-(require (planet bzlib/parseq:1:3))
-
-; Ebus SYN Byte-String
-(define ebus-const-syn (string->bytes/latin-1 "\xaa"))
-(define ebus-const-escape (string->bytes/latin-1 "\xa9"))
-(define ebus-const-ackok (string->bytes/latin-1 "\x00"))
-(define ebus-const-broadcastaddr 254)
-
-(struct ebus-body-broadcast (crc) #:transparent)
-
-(struct ebus-body-mastermaster (crc) #:transparent)
-
-(struct ebus-body-masterslave
- (crc payloadSlaveLength payloadSlave crcSlave)
- #:transparent)
-
-(struct ebus-paket
- (source destination primaryCommand secondaryCommand payloadLength payload body)
- #:transparent)
-
-;; single, maybe escaped, payload data byte
-(define ebus-payload (choice (seq escape-seq <- (bytes= ebus-const-escape)
- escape-code <- (byte-in (list 0 1))
- (return (cond
- ((= escape-code 0) ebus-const-escape)
- ((= escape-code 1) ebus-const-syn))))
- any-byte
- ))
-
-(define parse-ebus-broadcast (token (seq crc <- any-byte
- syn <- (bytes= ebus-const-syn)
- (return (ebus-body-broadcast crc)))))
-
-(define parse-ebus-mastermaster (token (seq crc <- any-byte
- ack <- (bytes= ebus-const-ackok) ; ACK des Empfängers
- syn <- (bytes= ebus-const-syn) ; SYN des Senders
- (return (ebus-body-mastermaster crc)))))
-
-(define parse-ebus-masterslave (token (seq crc <- any-byte
- ack <- (bytes= ebus-const-ackok) ;ACK des Empfängers
- payloadSlaveLength <- any-byte
- payloadSlave <- (repeat ebus-payload payloadSlaveLength payloadSlaveLength)
- crcSlave <- any-byte
- ackSlave <- (bytes= ebus-const-ackok) ;ACK des Senders
- synSlave <- (bytes= ebus-const-syn) ;SYN des Senders
- (return (ebus-body-masterslave crc payloadSlaveLength payloadSlave crcSlave)))))
-
-(define parse-ebus-master-or-slave (token (choice parse-ebus-mastermaster parse-ebus-masterslave)))
-
-(define parse-ebus-paket (token (seq source <- any-byte
- destination <- any-byte
- primaryCommand <- any-byte
- secondaryCommand <- any-byte
- payloadLength <- any-byte
- payload <- (repeat ebus-payload payloadLength payloadLength)
- body <- (cond ((= destination ebus-const-broadcastaddr) parse-ebus-broadcast)
- (else parse-ebus-master-or-slave))
- (return (ebus-paket source
- destination
- primaryCommand
- secondaryCommand
- payloadLength
- payload
- body)))))
-
-(define ebus-sync (tokens syncs <- (seq (repeat (string->bytes/latin-1 "\xaa")))
- (return (length syncs))))
-
-
-
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
-(define (read-ebus input-port)
- (let ([syn ((make-reader ebus-sync #:sof? #f #:eof? #f) input-port)]
- [paket ((make-reader parse-ebus-paket #:sof? #f #:eof? #f) input-port)])
- (cond ((not (false? syn))
- (display (format "drop ~s x SYN (~s) ~n" syn ebus-const-syn))))
- (cond ((not (false? paket))
- paket)
- ((eof-object? (peek-byte input-port))
- eof)
- (else
- (display (format "drop ~s ~n" (peek-byte input-port)))
- ; skip one byte
- (read-byte input-port)
- ;(file-position input-port (+ 1 (file-position input-port)))
- (read-ebus input-port)))))
-
-(define (read-ebus-loop input-port)
- (let ([paket (read-ebus (current-input-port))])
- (display (format "Paket ~s~n" paket))
- (cond ((not (eof-object? paket)) (read-ebus-loop input-port)))))
-
-(provide read-ebus
- read-ebus-loop
- (struct-out ebus-paket)
- (struct-out ebus-body-broadcast)
- (struct-out ebus-body-mastermaster)
- (struct-out ebus-body-masterslave)) \ No newline at end of file