lynxis lazus has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/34288 )

Change subject: hlr: implement str2apn() to convert an apn as string into octetstring ......................................................................

hlr: implement str2apn() to convert an apn as string into octetstring

APN are encoded by splitting each domain part by the dot and prefix each element by a 8bit length. E.g. internet -> \x08internet and internet.foo -> \x08internet\x03foo

Change-Id: I607969cd58110d4d5ff1b828e64cf2b5031868ac --- M hlr/HLR_Tests.ttcn 1 file changed, 72 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/88/34288/1

diff --git a/hlr/HLR_Tests.ttcn b/hlr/HLR_Tests.ttcn index 959c680..6c4995e 100644 --- a/hlr/HLR_Tests.ttcn +++ b/hlr/HLR_Tests.ttcn @@ -1917,6 +1917,65 @@ } }

+ +/* strchr similar to C's/posix strchr but returns the position of the first matching. + * if the char c isn't found it returns -1. + */ +function strchr(in charstring s, in charstring c) return integer { + for (var integer i := 0; i < lengthof(s); i := i+1) { + if (s[i] == c) { + return i; + } + } + return -1; +} + +/* str2apn returns octetstring + * internet -> '08'O & char2oct("internet") + * internet.foo -> '08'O & char2oct("internet") & '03'O & char2oct("foo") + * internet.-> '08'O & char2oct("internet") + */ +function str2apn(in charstring apn) return octetstring { + var octetstring result := ''O; + var charstring remain := apn; + var integer pos := strchr(remain, "."); + + while (pos != -1) { + /* ends on a dot. e.g. "internet.", we must ignore the ending dot and this is then the last element */ + if (pos == 0) { + /* it's not allowed to start with a dot. */ + return ''O; + } + + if (pos + 1 == lengthof(remain)) { + /* remove the dot */ + remain := substr(remain, 0, pos) + break; + } + + result := result & int2oct(pos, 1) & char2oct(substr(remain, 0, pos)); + remain := substr(remain, pos + 1, lengthof(remain) - pos - 1); + pos := strchr(remain, "."); + } + /* last element */ + var integer len := lengthof(remain); + result := result & int2oct(len, 1) & char2oct(remain); + return result; +} + +private function test_assert(boolean term) { + if (term == false) { + setverdict(fail, "Values missmatch"); + } +} + +private function test_str2apn() { + test_assert(str2apn("internet") == '08'O & char2oct("internet")); + test_assert(str2apn("internet.") == '08'O & char2oct("internet")); + test_assert(str2apn("internet.foo") == '08'O & char2oct("internet") & '03'O & char2oct("foo")); + test_assert(str2apn(".internet.foo") == ''O); +} + /* TODO: * UL with ISD error * UL with ISD timeout