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#include "RLCMAC_Types.hh"
#include "GSM_Types.hh"
/* Decoding of TS 44.060 GPRS RLC/MAC blocks, portions requiring manual functions
* beyond what TITAN RAW coder can handle internally.
*
* (C) 2017 by Harald Welte <laforge@gnumonks.org>
*/
namespace RLCMAC__Types {
OCTETSTRING enc__RlcmacDlDataBlock(const RlcmacDlDataBlock& si)
{
RlcmacDlDataBlock in = si;
OCTETSTRING ret_val;
TTCN_Buffer ttcn_buffer;
int i;
/* Fix 'e' bit of initial header based on following blocks */
if (!in.blocks().is_bound() ||
(in.blocks().size_of() == 1 && !in.blocks()[0].hdr().is_bound()))
in.mac__hdr().hdr__ext().e() = true;
else
in.mac__hdr().hdr__ext().e() = false;
/* use automatic/generated decoder for header */
in.mac__hdr().encode(DlMacDataHeader_descr_, ttcn_buffer, TTCN_EncDec::CT_RAW);
/* Add LI octets, if any */
if (in.blocks().is_bound() &&
(in.blocks().size_of() != 1 || in.blocks()[0].hdr().is_bound())) {
/* first write LI octets */
for (i = 0; i < in.blocks().size_of(); i++) {
/* fix the 'E' bit in case it is not clear */
if (i < in.blocks().size_of()-1)
in.blocks()[i].hdr()().e() = false;
else
in.blocks()[i].hdr()().e() = true;
in.blocks()[i].hdr()().encode(LlcBlockHdr_descr_, ttcn_buffer, TTCN_EncDec::CT_RAW);
}
}
if (in.blocks().is_bound()) {
for (i = 0; i < in.blocks().size_of(); i++) {
if (!in.blocks()[i].is_bound())
continue;
ttcn_buffer.put_string(in.blocks()[i].payload());
}
}
ttcn_buffer.get_string(ret_val);
return ret_val;
}
RlcmacDlDataBlock dec__RlcmacDlDataBlock(const OCTETSTRING& stream)
{
RlcmacDlDataBlock ret_val;
TTCN_Buffer ttcn_buffer(stream);
int num_llc_blocks = 0;
/* use automatic/generated decoder for header */
ret_val.mac__hdr().decode(DlMacDataHeader_descr_, ttcn_buffer, TTCN_EncDec::CT_RAW);
/* optional extension octets, containing LI+M+E of Llc blocks */
if (ret_val.mac__hdr().hdr__ext().e() == false) {
/* extension octet follows, i.e. optional Llc length octets */
while (1) {
/* decode one more extension octet with LlcBlocHdr inside */
LlcBlock lb;
lb.hdr()().decode(LlcBlockHdr_descr_, ttcn_buffer, TTCN_EncDec::CT_RAW);
ret_val.blocks()[num_llc_blocks++] = lb;
/* if E == '1'B, we can proceed further */
if (lb.hdr()().e() == true)
break;
}
}
/* RLC blocks at end */
if (ret_val.mac__hdr().hdr__ext().e() == true) {
LlcBlock lb;
unsigned int length = ttcn_buffer.get_read_len();
/* LI not present: The Upper Layer PDU that starts with the current RLC data block either
* fills the current RLC data block precisely or continues in the following in-sequence RLC
* data block */
lb.payload() = OCTETSTRING(length, ttcn_buffer.get_read_data());
ttcn_buffer.increase_pos(length);
ret_val.blocks()[0] = lb;
} else {
if (ret_val.blocks().is_bound()) {
for (int i = 0; i < ret_val.blocks().size_of(); i++) {
unsigned int length = ret_val.blocks()[i].hdr()().length__ind();
if (length > ttcn_buffer.get_read_len())
length = ttcn_buffer.get_read_len();
ret_val.blocks()[i].payload() = OCTETSTRING(length, ttcn_buffer.get_read_data());
ttcn_buffer.increase_pos(length);
}
}
}
return ret_val;
}
OCTETSTRING enc__RlcmacUlDataBlock(const RlcmacUlDataBlock& si)
{
RlcmacUlDataBlock in = si;
OCTETSTRING ret_val;
TTCN_Buffer ttcn_buffer;
int i;
if (!in.blocks().is_bound()) {
/* we don't have nay blocks: Add length value (zero) */
in.mac__hdr().e() = false; /* E=0: extension octet follows */
} else if (in.blocks().size_of() == 1 && in.blocks()[0].hdr() == OMIT_VALUE) {
/* If there's only a single block, and that block has no HDR value defined, */
in.mac__hdr().e() = true; /* E=0: extension octet follows */
} else {
/* Length value */
in.mac__hdr().e() = false;
}
/* Fix other presence indications */
in.mac__hdr().tlli__ind() = in.tlli().is_bound() && in.tlli() != OMIT_VALUE;
in.mac__hdr().pfi__ind() = in.pfi().is_bound() && in.pfi() != OMIT_VALUE;
/* use automatic/generated encoder for header */
in.mac__hdr().encode(UlMacDataHeader_descr_, ttcn_buffer, TTCN_EncDec::CT_RAW);
if (in.mac__hdr().e() == false) {
/* Add LI octets, if any */
if (!in.blocks().is_bound()) {
ttcn_buffer.put_c(0x01); /* M=0, E=1 LEN=0 */
} else {
for (i = 0; i < in.blocks().size_of(); i++) {
#if 0
/* check for penultimate block */
if (i == in.blocks().size_of()-2) {
/* if last block has no header, no more LI */
if (in.blocks()[i+1].hdr() == OMIT_VALUE) {
in.blocks()[i].hdr()().more() = true;
} else {
/* header present, we have to encode LI */
in.blocks()[i].hdr()().more() = false;
in.blocks()[i].hdr()().length__ind() =
in.blocks()[i+1].payload().lengthof();
}
} else if (i < in.blocks().size_of()-2) {
/* one of the first blocks, before the penultimate or last */
in.blocks()[i].hdr()().e() = false; /* LI present */
/* re-compute length */
in.blocks()[i].hdr()().length__ind() =
in.blocks()[i+1].payload().lengthof();
}
/* Encode LI octet if E=0 */
}
#endif
if (in.blocks()[i].hdr() != OMIT_VALUE) {
in.blocks()[i].hdr()().encode(LlcBlockHdr_descr_, ttcn_buffer,
TTCN_EncDec::CT_RAW);
}
}
}
}
if (in.mac__hdr().tlli__ind()) {
ttcn_buffer.put_string(in.tlli());
}
if (in.mac__hdr().pfi__ind()) {
in.pfi().encode(RlcmacUlDataBlock_pfi_descr_, ttcn_buffer, TTCN_EncDec::CT_RAW);
}
if (in.blocks().is_bound()) {
for (i = 0; i < in.blocks().size_of(); i++) {
if (!in.blocks()[i].is_bound())
continue;
ttcn_buffer.put_string(in.blocks()[i].payload());
}
}
ttcn_buffer.get_string(ret_val);
return ret_val;
}
RlcmacUlDataBlock dec__RlcmacUlDataBlock(const OCTETSTRING& stream)
{
RlcmacUlDataBlock ret_val;
TTCN_Buffer ttcn_buffer(stream);
int num_llc_blocks = 0;
TTCN_Logger::begin_event(TTCN_Logger::DEBUG_ENCDEC);
TTCN_Logger::log_event_str("==================================\n"
"dec_RlcmacUlDataBlock(): Stream before decoding: ");
stream.log();
TTCN_Logger::end_event();
/* use automatic/generated decoder for header */
ret_val.mac__hdr().decode(UlMacDataHeader_descr_, ttcn_buffer, TTCN_EncDec::CT_RAW);
TTCN_Logger::begin_event(TTCN_Logger::DEBUG_ENCDEC);
TTCN_Logger::log_event_str("dec_RlcmacUlDataBlock(): Stream after decoding hdr: ");
ttcn_buffer.log();
TTCN_Logger::end_event();
TTCN_Logger::begin_event(TTCN_Logger::DEBUG_ENCDEC);
TTCN_Logger::log_event_str("dec_RlcmacUlDataBlock(): ret_val after decoding hdr: ");
ret_val.log();
TTCN_Logger::end_event();
/* Manually decoder remainder of ttcn_buffer, containing optional header octets,
* optional tlli, optional pfi and LLC Blocks */
/* optional extension octets, containing LI+M+E of Llc blocks */
if (ret_val.mac__hdr().e() == false) {
/* extension octet follows, i.e. optional Llc length octets */
while (1) {
/* decode one more extension octet with LlcBlocHdr inside */
LlcBlock lb;
lb.hdr()().decode(LlcBlockHdr_descr_, ttcn_buffer, TTCN_EncDec::CT_RAW);
ret_val.blocks()[num_llc_blocks++] = lb;
TTCN_Logger::begin_event(TTCN_Logger::DEBUG_ENCDEC);
TTCN_Logger::log_event_str("dec_RlcmacUlDataBlock(): Stream after decoding ExtOct: ");
ttcn_buffer.log();
TTCN_Logger::end_event();
TTCN_Logger::begin_event(TTCN_Logger::DEBUG_ENCDEC);
TTCN_Logger::log_event_str("dec_RlcmacUlDataBlock(): ret_val after decoding ExtOct: ");
ret_val.log();
TTCN_Logger::end_event();
/* if E == '1'B, we can proceed further */
if (lb.hdr()().e() == true)
break;
}
}
/* parse optional TLLI */
if (ret_val.mac__hdr().tlli__ind()) {
ret_val.tlli() = OCTETSTRING(4, ttcn_buffer.get_read_data());
ttcn_buffer.increase_pos(4);
}
/* parse optional PFI */
if (ret_val.mac__hdr().pfi__ind()) {
ret_val.pfi().decode(RlcmacUlDataBlock_pfi_descr_, ttcn_buffer, TTCN_EncDec::CT_RAW);
}
/* RLC blocks at end */
if (ret_val.mac__hdr().e() == true) {
LlcBlock lb;
unsigned int length = ttcn_buffer.get_read_len();
/* LI not present: The Upper Layer PDU that starts with the current RLC data block either
* fills the current RLC data block precisely or continues in the following in-sequence RLC
* data block */
lb.payload() = OCTETSTRING(length, ttcn_buffer.get_read_data());
ttcn_buffer.increase_pos(length);
ret_val.blocks()[0] = lb;
} else {
if (ret_val.blocks().is_bound()) {
for (int i = 0; i < ret_val.blocks().size_of(); i++) {
unsigned int length = ret_val.blocks()[i].hdr()().length__ind();
if (length > ttcn_buffer.get_read_len())
length = ttcn_buffer.get_read_len();
ret_val.blocks()[i].payload() = OCTETSTRING(length, ttcn_buffer.get_read_data());
ttcn_buffer.increase_pos(length);
}
}
}
TTCN_Logger::begin_event(TTCN_Logger::DEBUG_ENCDEC);
TTCN_Logger::log_event_str("dec_RlcmacUlDataBlock(): Stream before return: ");
ttcn_buffer.log();
TTCN_Logger::end_event();
TTCN_Logger::begin_event(TTCN_Logger::DEBUG_ENCDEC);
TTCN_Logger::log_event_str("dec_RlcmacUlDataBlock(): ret_val before return: ");
ret_val.log();
TTCN_Logger::end_event();
return ret_val;
}
OCTETSTRING enc__RlcmacUlBlock(const RlcmacUlBlock& si)
{
if (si.ischosen(RlcmacUlBlock::ALT_data))
return enc__RlcmacUlDataBlock(si.data());
else
return enc__RlcmacUlCtrlBlock(si.ctrl());
}
OCTETSTRING enc__RlcmacDlBlock(const RlcmacDlBlock& si)
{
if (si.ischosen(RlcmacDlBlock::ALT_data))
return enc__RlcmacDlDataBlock(si.data());
else
return enc__RlcmacDlCtrlBlock(si.ctrl());
}
RlcmacUlBlock dec__RlcmacUlBlock(const OCTETSTRING& stream)
{
RlcmacUlBlock ret_val;
unsigned char pt = stream[0].get_octet() >> 6;
if (pt == MacPayloadType::MAC__PT__RLC__DATA)
ret_val.data() = dec__RlcmacUlDataBlock(stream);
else
ret_val.ctrl() = dec__RlcmacUlCtrlBlock(stream);
return ret_val;
}
RlcmacDlBlock dec__RlcmacDlBlock(const OCTETSTRING& stream)
{
RlcmacDlBlock ret_val;
unsigned char pt = stream[0].get_octet() >> 6;
if (pt == MacPayloadType::MAC__PT__RLC__DATA)
ret_val.data() = dec__RlcmacDlDataBlock(stream);
else
ret_val.ctrl() = dec__RlcmacDlCtrlBlock(stream);
return ret_val;
}
} // namespace
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