Messages: Prepare to parse TV and TLV messages

Ask the BSSMAP type for the size of the payload. This does
not include the Tag and the Length field. BSSMAP and GSM48
behave a bit differently here. The support for T might still
be a bit broken.

1 files changed, 4 insertions, 0 deletions

diff --git a/BSSMAP.st b/BSSMAP.st
index fa55c8c..43bb14a 100644
--- a/BSSMAP.st
+++ b/BSSMAP.st
@@ -1,6 +1,10 @@
 IEBase subclass: GSM0808IE [
     <category: 'osmo-message'>
     <comment: 'Base class of IEs for GSM0808'>
+
+    GSM0808IE class >> length: aByteArray [
+        ^ (aByteArray at: 2).
+    ]
 ]
 
 Object subclass: GSM0808Helper [