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"
(C) 2010-2012 by Holger Hans Peter Freyther
All Rights Reserved
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"
Object subclass: BSSAPHelper [
<category: 'OsmoGSM'>
<comment: 'BSSAP message routines'>
BSSAPHelper class >> msgManagemnt [ <category: 'spec'> ^ 0 ]
BSSAPHelper class >> msgDtap [ <category: 'spec'> ^ 1 ]
BSSAPHelper class >> prependManagement: aMsg [
<category: 'creation'>
"Prepent the BSSAP Management header"
| tmp |
tmp := OrderedCollection new.
tmp add: self msgManagemnt.
tmp add: aMsg size.
aMsg prependByteArray: tmp asByteArray.
]
BSSAPHelper class >> prependDTAP: aMsg dlci: sapi [
<category: 'creation'>
"Prepend the DTAP header"
| tmp |
tmp := OrderedCollection new.
tmp add: self msgDtap.
tmp add: sapi.
tmp add: aMsg size.
aMsg prependByteArray: tmp asByteArray.
]
]
Object subclass: BSSAPMessage [
<category: 'OsmoGSM'>
BSSAPMessage class >> decode: aStream [
| type |
type := aStream next.
BSSAPMessage allSubclassesDo: [:each |
each msgType = type
ifTrue: [
^ each parseFrom: aStream.
]
].
^ Error signal: 'No handler for: ', type asString.
]
]
BSSAPMessage subclass: BSSAPManagement [
| data |
<category: 'OsmoGSM'>
BSSAPManagement class >> msgType [ <category: 'factory'> ^ BSSAPHelper msgManagemnt ]
BSSAPManagement class >> initWith: data [
^ (self new)
data: data;
yourself.
]
BSSAPMessage class >> parseFrom: aStream [
| size data |
size := aStream next.
data := aStream next: size.
^ BSSAPManagement initWith: data.
]
data: aPayload [
data := aPayload.
]
data [
^ data
]
writeOn: aMsg [
| dat |
aMsg putByte: BSSAPHelper msgManagemnt.
dat := data toMessageOrByteArray.
aMsg putByte: dat size.
aMsg putByteArray: dat.
]
]
BSSAPMessage subclass: BSSAPDTAP [
| data li |
<category: 'OsmoGSM'>
BSSAPDTAP class >> msgType [ <category: 'factory'> ^ BSSAPHelper msgDtap ]
BSSAPDTAP class >> initWith: data linkIdentifier: li [
^ self new
data: data;
linkIdentifier: li;
yourself
]
BSSAPDTAP class >> parseFrom: aStream [
| li size dat |
li := aStream next.
size := aStream next.
dat := aStream next: size.
^ BSSAPDTAP initWith: dat linkIdentifier: li.
]
writeOn: aMsg [
| dat |
dat := data toMessageOrByteArray.
aMsg putByte: self class msgType.
aMsg putByte: li.
aMsg putByte: dat size.
aMsg putByteArray: dat.
]
data [
^ data
]
data: aData [
data := aData.
]
sapi [
^ li bitAnd: 7
]
linkIdentifier [
^ li
]
linkIdentifier: aLi [
li := aLi.
]
]
|
