library/RLCMAC_EncDec.cc

#include <stdint.h>
#include <endian.h>

#include "RLCMAC_Types.hh"
#include "RLCMAC_Templates.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>
 * All rights reserved.
 *
 * Released under the terms of GNU General Public License, Version 2 or
 * (at your option) any later version.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

namespace RLCMAC__Types {

/////////////////////
// INTENRAL HELPERS
/////////////////////

/* TS 04.60  10.3a.4.1.1 */
struct gprs_rlc_ul_header_egprs_1 {
#if __BYTE_ORDER == __LITTLE_ENDIAN
	uint8_t r:1,
		 si:1,
		 cv:4,
		 tfi_hi:2;
	uint8_t tfi_lo:3,
		 bsn1_hi:5;
	uint8_t bsn1_lo:6,
		 bsn2_hi:2;
	uint8_t bsn2_lo:8;
	uint8_t cps:5,
		 rsb:1,
		 pi:1,
		 spare_hi:1;
	uint8_t spare_lo:6,
		 dummy:2;
#else
/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
	uint8_t tfi_hi:2, cv:4, si:1, r:1;
	uint8_t bsn1_hi:5, tfi_lo:3;
	uint8_t bsn2_hi:2, bsn1_lo:6;
	uint8_t bsn2_lo:8;
	uint8_t spare_hi:1, pi:1, rsb:1, cps:5;
	uint8_t dummy:2, spare_lo:6;
#endif
} __attribute__ ((packed));

/* TS 04.60  10.3a.4.2.1 */
struct gprs_rlc_ul_header_egprs_2 {
#if __BYTE_ORDER == __LITTLE_ENDIAN
	uint8_t r:1,
		 si:1,
		 cv:4,
		 tfi_hi:2;
	uint8_t tfi_lo:3,
		 bsn1_hi:5;
	uint8_t bsn1_lo:6,
		 cps_hi:2;
	uint8_t cps_lo:1,
		 rsb:1,
		 pi:1,
		 spare_hi:5;
	uint8_t spare_lo:5,
		 dummy:3;
#else
/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
	uint8_t tfi_hi:2, cv:4, si:1, r:1;
	uint8_t bsn1_hi:5, tfi_lo:3;
	uint8_t cps_hi:2, bsn1_lo:6;
	uint8_t spare_hi:5, pi:1, rsb:1, cps_lo:1;
	uint8_t dummy:3, spare_lo:5;
#endif
} __attribute__ ((packed));

/* TS 04.60  10.3a.4.3.1 */
struct gprs_rlc_ul_header_egprs_3 {
#if __BYTE_ORDER == __LITTLE_ENDIAN
	uint8_t r:1,
		 si:1,
		 cv:4,
		 tfi_hi:2;
	uint8_t tfi_lo:3,
		 bsn1_hi:5;
	uint8_t bsn1_lo:6,
		 cps_hi:2;
	uint8_t cps_lo:2,
		 spb:2,
		 rsb:1,
		 pi:1,
		 spare:1,
		 dummy:1;
#else
/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
	uint8_t tfi_hi:2, cv:4, si:1, r:1;
	uint8_t bsn1_hi:5, tfi_lo:3;
	uint8_t cps_hi:2, bsn1_lo:6;
	uint8_t dummy:1, spare:1, pi:1, rsb:1, spb:2, cps_lo:2;
#endif
} __attribute__ ((packed));

struct gprs_rlc_dl_header_egprs_1 {
#if __BYTE_ORDER == __LITTLE_ENDIAN
	uint8_t usf:3,
		 es_p:2,
		 rrbp:2,
		 tfi_hi:1;
	uint8_t tfi_lo:4,
		 pr:2,
		 bsn1_hi:2;
	uint8_t bsn1_mid:8;
	uint8_t bsn1_lo:1,
		 bsn2_hi:7;
	uint8_t bsn2_lo:3,
		 cps:5;
#else
/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
	uint8_t tfi_hi:1, rrbp:2, es_p:2, usf:3;
	uint8_t bsn1_hi:2, pr:2, tfi_lo:4;
	uint8_t bsn1_mid:8;
	uint8_t bsn2_hi:7, bsn1_lo:1;
	uint8_t cps:5, bsn2_lo:3;
#endif
} __attribute__ ((packed));

struct gprs_rlc_dl_header_egprs_2 {
#if __BYTE_ORDER == __LITTLE_ENDIAN
	uint8_t usf:3,
		 es_p:2,
		 rrbp:2,
		 tfi_hi:1;
	uint8_t tfi_lo:4,
		 pr:2,
		 bsn1_hi:2;
	uint8_t bsn1_mid:8;
	uint8_t bsn1_lo:1,
		 cps:3,
		 dummy:4;
#else
/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
	uint8_t tfi_hi:1, rrbp:2, es_p:2, usf:3;
	uint8_t bsn1_hi:2, pr:2, tfi_lo:4;
	uint8_t bsn1_mid:8;
	uint8_t dummy:4, cps:3, bsn1_lo:1;
#endif
} __attribute__ ((packed));

struct gprs_rlc_dl_header_egprs_3 {
#if __BYTE_ORDER == __LITTLE_ENDIAN
	uint8_t usf:3,
		 es_p:2,
		 rrbp:2,
		 tfi_hi:1;
	uint8_t tfi_lo:4,
		 pr:2,
		 bsn1_hi:2;
	uint8_t bsn1_mid:8;
	uint8_t bsn1_lo:1,
		 cps:4,
		 spb:2,
		 dummy:1;
#else
/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
	uint8_t tfi_hi:1, rrbp:2, es_p:2, usf:3;
	uint8_t bsn1_hi:2, pr:2, tfi_lo:4;
	uint8_t bsn1_mid:8;
	uint8_t dummy:1, spb:2, cps:4, bsn1_lo:1;
#endif
} __attribute__ ((packed));

/*
static const char hex_chars[] = "0123456789abcdef";
void printbuffer(const char* ptr, TTCN_Buffer& buf) {
	int len = buf.get_len();
	const unsigned char* cbuf = buf.get_data();

	fprintf(stderr, "printbuffer %s (len=%d): [", ptr, len);

	for (int i = 0; i < len; i++) {
		fprintf(stderr, " %c%c", hex_chars[cbuf[i] >> 4], hex_chars[cbuf[i] & 0xf]);
	}

	fprintf(stderr, " ]\n");
}
*/

static CodingScheme::enum_type payload_len_2_coding_scheme(size_t payload_len) {
	switch (payload_len) {
	case 23:
		return CodingScheme::CS__1;
	case 34:
		return CodingScheme::CS__2;
	case 40:
		return CodingScheme::CS__3;
	case 54:
		return CodingScheme::CS__4;
	case 27:
		return CodingScheme::MCS__1;
	case 33:
		return CodingScheme::MCS__2;
	case 42:
		return CodingScheme::MCS__3;
	case 49:
		return CodingScheme::MCS__4;
	case 60: /* fall through */
	case 61:
		return CodingScheme::MCS__5;
	case 78: /* fall through */
	case 79:
		return CodingScheme::MCS__6;
	case 118: /* fall through */
	case 119:
		return CodingScheme::MCS__7;
	case 142: /* fall through */
	case 143:
		return CodingScheme::MCS__8;
	case 154: /* fall through */
	case 155:
		return CodingScheme::MCS__9;
	default:
		fprintf(stderr, "ERROR: Unknown CodingSCheme for payload_len=%zu\n", payload_len);
		return CodingScheme::CS__1;
	}
}

static unsigned int coding_scheme_2_data_block_len(CodingScheme::enum_type mcs) {
	switch (mcs) {
	case CodingScheme::MCS__0:
		return 0;
	case CodingScheme::MCS__1:
		return 22;
	case CodingScheme::MCS__2:
		return 28;
	case CodingScheme::MCS__3:
		return 37;
	case CodingScheme::MCS__4:
		return 44;
	case CodingScheme::MCS__5:
		return 56;
	case CodingScheme::MCS__6:
		return 74;
	case CodingScheme::MCS__7:
		return 56;
	case CodingScheme::MCS__8:
		return 68;
	case CodingScheme::MCS__9:
		return 74;
	default:
		return 22; /* MCS1*/
	}
}

static uint8_t bs2uint8(const BITSTRING& bs)
{
	int len = bs.lengthof();
	int i;
	uint8_t res = 0;
	for (i = 0; i < len; i++) {
		res = res << 1;
		res |= (bs[i].get_bit() ? 1 : 0);
	}
	return res;
}

/* determine the number of rlc data blocks and their size / offsets */
static void
setup_rlc_mac_priv(CodingScheme::enum_type mcs, EgprsHeaderType::enum_type hdrtype, boolean is_uplink,
	unsigned int *n_calls, unsigned int *data_block_bits, unsigned int *data_block_offsets)
{
	unsigned int nc, dbl = 0, dbo[2] = {0,0};

	dbl = coding_scheme_2_data_block_len(mcs);

	switch (hdrtype) {
	case EgprsHeaderType::RLCMAC__HDR__TYPE__1:
		nc = 3;
		dbo[0] = is_uplink ? 5*8 + 6 : 5*8 + 0;
		dbo[1] = dbo[0] + dbl * 8 + 2;
		break;
	case EgprsHeaderType::RLCMAC__HDR__TYPE__2:
		nc = 2;
		dbo[0] = is_uplink ? 4*8 + 5 : 3*8 + 4;
		break;
	case EgprsHeaderType::RLCMAC__HDR__TYPE__3:
		nc = 2;
		dbo[0] = 3*8 + 7;
		break;
	default:
		nc = 1;
		break;
	}

	*n_calls = nc;
	*data_block_bits = dbl * 8 + 2;
	data_block_offsets[0] = dbo[0];
	data_block_offsets[1] = dbo[1];
}

/* bit-shift the entire 'src' of length 'length_bytes' by 'offset_bits'
 * and store the result to caller-allocated 'buffer'.  The shifting is
 * done lsb-first. */
static void clone_aligned_buffer_lsbf(unsigned int offset_bits, unsigned int length_bytes,
	const uint8_t *src, uint8_t *buffer)
{
	unsigned int hdr_bytes;
	unsigned int extra_bits;
	unsigned int i;

	uint8_t c, last_c;
	uint8_t *dst;

	hdr_bytes = offset_bits / 8;
	extra_bits = offset_bits % 8;

	//fprintf(stderr, "RLMAC: clone: hdr_bytes=%u extra_bits=%u (length_bytes=%u)\n", hdr_bytes, extra_bits, length_bytes);

	if (extra_bits == 0) {
		/* It is aligned already */
		memcpy(buffer, src + hdr_bytes, length_bytes);
		return;
	}

	dst = buffer;
	src = src + hdr_bytes;
	last_c = *(src++);

	for (i = 0; i < length_bytes; i++) {
		c = src[i];
		*(dst++) = (last_c >> extra_bits) | (c << (8 - extra_bits));
		last_c = c;
	}
}

/* obtain an (aligned) EGPRS data block with given bit-offset and
 * bit-length from the parent buffer */
static void get_egprs_data_block(const TTCN_Buffer& orig_ttcn_buffer, unsigned int offset_bits,
	unsigned int length_bits, TTCN_Buffer& dst_ttcn_buffer)
{
	const unsigned int initial_spare_bits = 6;
	unsigned char *aligned_buf = NULL;
	size_t min_src_length_bytes = (offset_bits + length_bits + 7) / 8;
	size_t length_bytes = (initial_spare_bits + length_bits + 7) / 8;
	size_t accepted_len = length_bytes;

	//fprintf(stderr, "RLMAC: trying to allocate %u bytes (orig is %zu bytes long with read pos %zu)\n", length_bytes, orig_ttcn_buffer.get_len(), orig_ttcn_buffer.get_pos());
	dst_ttcn_buffer.get_end(aligned_buf, accepted_len);
	if (accepted_len < length_bytes) {
		fprintf(stderr, "RLMAC: ERROR! asked for %zu bytes but got %zu\n", length_bytes, accepted_len);
	}

	/* Copy the data out of the tvb to an aligned buffer */
	clone_aligned_buffer_lsbf(
		offset_bits - initial_spare_bits, length_bytes,
		orig_ttcn_buffer.get_data(),
		aligned_buf);

	/* clear spare bits and move block header bits to the right */
	aligned_buf[0] = aligned_buf[0] >> initial_spare_bits;

	dst_ttcn_buffer.increase_length(length_bytes);
}

/* bit-shift the entire 'src' of length 'length_bytes'
 * and store the result to caller-allocated 'buffer'  by 'offset_bits'.  The shifting is
 * done lsb-first. */
static void clone_unaligned_buffer_lsbf(unsigned int offset_bits, unsigned int length_bytes,
	const uint8_t *src, uint8_t *buffer)
{
	unsigned int hdr_bytes;
	unsigned int extra_bits;
	unsigned int i;

	uint8_t c, last_hdr_c, last_c;
	uint8_t *dst;

	hdr_bytes = offset_bits / 8;
	extra_bits = offset_bits % 8;

	//fprintf(stderr, "RLMAC: clone: hdr_bytes=%u extra_bits=%u (length_bytes=%u)\n", hdr_bytes, extra_bits, length_bytes);

	if (extra_bits == 0) {
		/* It is aligned already */
		memcpy(buffer, src + hdr_bytes, length_bytes);
		return;
	}

	/* Copy first header+data byte, it's not handled correctly by loop */
	dst = buffer + hdr_bytes;
	last_hdr_c = *dst;
	last_c = *dst << (8 - extra_bits);

	for (i = 0; i < length_bytes; i++) {
		c = src[i];
		*(dst++) = (last_c >> (8 - extra_bits)) | (c << extra_bits);
		last_c = c;
	}
	/* overwrite the lower extra_bits */
	*dst = (*dst & (0xff << extra_bits)) | (last_c >> (8 - extra_bits));

	/* Copy back first header+data byte */
	dst = buffer + hdr_bytes;
	*(dst++) = last_hdr_c | (src[0] << (8 - extra_bits));
	*dst |= (src[0] >> (extra_bits)) & (0xff >> (8 - extra_bits));
}

/* put an (aligned) EGPRS data block with given bit-offset and
 * bit-length into parent buffer */
static void put_egprs_data_block(const TTCN_Buffer& aligned_data_block_buffer, unsigned int offset_bits,
	unsigned int length_bits, TTCN_Buffer& dst_ttcn_buffer)
{
	const unsigned int initial_spare_bits = 6;
	unsigned char *unaligned_buf = NULL;
	char tmpbuf[120];
	int tmplen = dst_ttcn_buffer.get_len();
	//size_t max_length_bytes = (initial_spare_bits + length_bits + 7) / 8;
	size_t length_bytes = tmplen + aligned_data_block_buffer.get_len();
	size_t accepted_len = length_bytes;

	//fprintf(stderr, "RLMAC: trying to allocate %u bytes\n", length_bytes);

	/* API .get_end() is the only one I could find to access writeable
	   memory in the buffer. It points to the end. Hence, we first copy
	   (readonly) data to tmpbuf and later clear() so that .get_end()
	   provides us with a pointer to the start of the buffer. */
	memcpy(tmpbuf, dst_ttcn_buffer.get_data(), tmplen);
	dst_ttcn_buffer.clear();
	dst_ttcn_buffer.get_end(unaligned_buf, accepted_len);
	if (accepted_len < tmplen) {
		fprintf(stderr, "RLMAC: ERROR! asked for %zu bytes but got %zu\n", length_bytes, accepted_len);
	}
	memcpy(unaligned_buf, tmpbuf, tmplen);

	/* Copy the data out of the tvb to an aligned buffer */
	clone_unaligned_buffer_lsbf(
		offset_bits - initial_spare_bits, length_bytes,
		aligned_data_block_buffer.get_data(),
		unaligned_buf);

	dst_ttcn_buffer.increase_length(length_bytes);
}

/* Append padding bytes and spare bits at the end of ttcn_buffer, based on requested CS */
static void encode_trailing_padding_spb(TTCN_Buffer& ttcn_buffer, CodingScheme cs)
{
	uint8_t buf[256]; /* enough to fit any RLCMAC buffer*/
	uint32_t blk_len = RLCMAC__Templates::f__rlcmac__cs__mcs2block__len(cs);
	uint32_t blk_len_no_spb = RLCMAC__Templates::f__rlcmac__cs__mcs2block__len__no__spare__bits(cs);
	uint32_t data_len = ttcn_buffer.get_len();

	if (data_len > blk_len_no_spb) {
		fprintf(stderr, "Buffer too large for requested CS! %s (%s:%u)\n", __func__, __FILE__, __LINE__);
		// TODO: throw exception?
	}

	for (int i = 0; i < blk_len_no_spb - data_len; i++)
		buf[i] = 0x2b; /* Padding bits if needed */
	for (int i = blk_len_no_spb - data_len; i < blk_len - data_len; i++)
		buf[i] = 0x00;  /* Spare bits if needed */

	const OCTETSTRING& pad_octstr = OCTETSTRING(blk_len - data_len, buf);
	ttcn_buffer.put_string(pad_octstr);
}

/////////////////////
// DECODE
/////////////////////

/* DECODE DOWNLINK */

RlcmacDlDataBlock dec__RlcmacDlDataBlock(const OCTETSTRING& stream)
{
	RlcmacDlDataBlock ret_val;
	TTCN_Buffer ttcn_buffer(stream);
	int num_llc_blocks = 0;

	ret_val.cs() = payload_len_2_coding_scheme(stream.lengthof());

	/* 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.hdr() = OMIT_VALUE;
		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;
}

static
EgprsDlMacDataHeader dec__EgprsDlMacDataHeader_type1(const OCTETSTRING& stream)
{
	TTCN_Buffer ttcn_buffer(stream);
	EgprsDlMacDataHeader ret_val;
	const struct gprs_rlc_dl_header_egprs_1 *egprs1;
	uint8_t tmp;

	egprs1 = static_cast<const struct gprs_rlc_dl_header_egprs_1 *>
		((const void *)ttcn_buffer.get_data());

	ret_val.header__type() = EgprsHeaderType::RLCMAC__HDR__TYPE__1;
	ret_val.tfi() = egprs1->tfi_lo << 1 | egprs1->tfi_hi << 0;
	ret_val.rrbp() = egprs1->rrbp;
	tmp = egprs1->es_p;
	ret_val.esp() = BITSTRING(2, &tmp);
	ret_val.usf() = egprs1->usf;
	ret_val.bsn1() = egprs1->bsn1_lo << 10 | egprs1->bsn1_mid << 2 | egprs1->bsn1_hi;
	ret_val.bsn2__offset() = egprs1->bsn2_lo << 7 | egprs1->bsn2_hi;
	ret_val.pr() = egprs1->pr;
	ret_val.cps() = egprs1->cps;
	ret_val.spb() = OMIT_VALUE;

	ttcn_buffer.increase_pos(sizeof(*egprs1));
	return ret_val;
}

static
EgprsDlMacDataHeader dec__EgprsDlMacDataHeader_type2(const OCTETSTRING& stream)
{
	TTCN_Buffer ttcn_buffer(stream);
	EgprsDlMacDataHeader ret_val;
	const struct gprs_rlc_dl_header_egprs_2 *egprs2;
	uint8_t tmp;

	egprs2 = static_cast<const struct gprs_rlc_dl_header_egprs_2 *>
		((const void *)ttcn_buffer.get_data());

	ret_val.header__type() = EgprsHeaderType::RLCMAC__HDR__TYPE__2;
	ret_val.tfi() = egprs2->tfi_lo << 1 | egprs2->tfi_hi << 0;
	ret_val.rrbp() = egprs2->rrbp;
	tmp = egprs2->es_p;
	ret_val.esp() = BITSTRING(2, &tmp);
	ret_val.usf() = egprs2->usf;
	ret_val.bsn1() = egprs2->bsn1_lo << 10 | egprs2->bsn1_mid << 2 | egprs2->bsn1_hi;
	ret_val.bsn2__offset() = 0; /*TODO: mark optional and not set ? */
	ret_val.pr() = egprs2->pr;
	ret_val.cps() = egprs2->cps;
	ret_val.spb() = OMIT_VALUE;

	ttcn_buffer.increase_pos(sizeof(*egprs2));
	return ret_val;
}

static
EgprsDlMacDataHeader dec__EgprsDlMacDataHeader_type3(const OCTETSTRING& stream)
{
	TTCN_Buffer ttcn_buffer(stream);
	EgprsDlMacDataHeader ret_val;
	const struct gprs_rlc_dl_header_egprs_3 *egprs3;
	uint8_t tmp;

	egprs3 = static_cast<const struct gprs_rlc_dl_header_egprs_3 *>
		((const void *)ttcn_buffer.get_data());

	ret_val.header__type() = EgprsHeaderType::RLCMAC__HDR__TYPE__3;
	ret_val.tfi() = egprs3->tfi_lo << 1 | egprs3->tfi_hi << 0;
	ret_val.rrbp() = egprs3->rrbp;
	tmp = egprs3->es_p;
	ret_val.esp() = BITSTRING(2, &tmp);
	ret_val.usf() = egprs3->usf;
	ret_val.bsn1() = egprs3->bsn1_lo << 10 | egprs3->bsn1_mid << 2 | egprs3->bsn1_hi;
	ret_val.bsn2__offset() = 0; /*TODO: mark optional and not set ? */
	ret_val.pr() = egprs3->pr;
	ret_val.spb() = egprs3->spb;
	ret_val.cps() = egprs3->cps;

	ttcn_buffer.increase_pos(sizeof(*egprs3));
	return ret_val;
}

static
RlcmacDlEgprsDataBlock dec__RlcmacDlEgprsDataBlock(const OCTETSTRING& stream)
{
	RlcmacDlEgprsDataBlock ret_val;
	TTCN_Buffer ttcn_buffer(stream);
	TTCN_Buffer aligned_buffer;
	int num_llc_blocks = 0;
	unsigned int data_block_bits, data_block_offsets[2];
	unsigned int num_calls;
	const uint8_t *ti_e;

	ret_val.mcs() = payload_len_2_coding_scheme(stream.lengthof());
	switch (ret_val.mcs()) {
	case CodingScheme::MCS__0:
	case CodingScheme::MCS__1:
	case CodingScheme::MCS__2:
	case CodingScheme::MCS__3:
	case CodingScheme::MCS__4:
		ret_val.mac__hdr() = dec__EgprsDlMacDataHeader_type3(stream);
		break;
	case CodingScheme::MCS__5:
	case CodingScheme::MCS__6:
		ret_val.mac__hdr() = dec__EgprsDlMacDataHeader_type2(stream);
		break;
	case CodingScheme::MCS__7:
	case CodingScheme::MCS__8:
	case CodingScheme::MCS__9:
		ret_val.mac__hdr() = dec__EgprsDlMacDataHeader_type1(stream);
		break;
	}
	setup_rlc_mac_priv(ret_val.mcs(), ret_val.mac__hdr().header__type(), false,
			   &num_calls, &data_block_bits, data_block_offsets);
	get_egprs_data_block(ttcn_buffer, data_block_offsets[0], data_block_bits, aligned_buffer);

	ti_e = aligned_buffer.get_read_data();
	ret_val.fbi() = *ti_e & 0x02 ? true : false;
	ret_val.e() = *ti_e & 0x01 ? true : false;
	aligned_buffer.increase_pos(1);

	/* optional extension octets, containing LI+E of Llc blocks */
	if (ret_val.e() == false) {
		/* extension octet follows, i.e. optional Llc length octets */
		while (1) {
			/* decode one more extension octet with LlcBlocHdr inside */
			EgprsLlcBlock lb;
			lb.hdr()().decode(EgprsLlcBlockHdr_descr_, aligned_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.e() == true) {
		EgprsLlcBlock lb;
		unsigned int length = aligned_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.hdr() = OMIT_VALUE;
		lb.payload() = OCTETSTRING(length, ttcn_buffer.get_read_data());
		aligned_buffer.increase_pos(length);
		ret_val.blocks()[0] = lb;
	} else {
		/* RLC blocks at end */
		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 > aligned_buffer.get_read_len())
					length = aligned_buffer.get_read_len();
				ret_val.blocks()[i].payload() = OCTETSTRING(length, aligned_buffer.get_read_data());
				aligned_buffer.increase_pos(length);
			}
		}
	}

	return ret_val;
}

RlcmacDlBlock dec__RlcmacDlBlock(const OCTETSTRING& stream)
{
	RlcmacDlBlock ret_val;
	size_t stream_len = stream.lengthof();
	CodingScheme::enum_type cs_mcs = payload_len_2_coding_scheme(stream_len);
	unsigned char pt;

	switch (cs_mcs) {
	case CodingScheme::CS__1:
	case CodingScheme::CS__2:
	case CodingScheme::CS__3:
	case CodingScheme::CS__4:
		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);
		break;
	case CodingScheme::MCS__0:
	case CodingScheme::MCS__1:
	case CodingScheme::MCS__2:
	case CodingScheme::MCS__3:
	case CodingScheme::MCS__4:
	case CodingScheme::MCS__5:
	case CodingScheme::MCS__6:
	case CodingScheme::MCS__7:
	case CodingScheme::MCS__8:
	case CodingScheme::MCS__9:
		ret_val.data__egprs() = dec__RlcmacDlEgprsDataBlock(stream);
		break;
	}
	return ret_val;
}

/* DECODE UPLINK */

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();

	ret_val.cs() = payload_len_2_coding_scheme(stream.lengthof());

	/* 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);
	} else {
		ret_val.tlli() = OMIT_VALUE;
	}
	/* parse optional PFI */
	if (ret_val.mac__hdr().pfi__ind()) {
		ret_val.pfi().decode(RlcmacUlDataBlock_pfi_descr_, ttcn_buffer, TTCN_EncDec::CT_RAW);
	} else {
		ret_val.pfi() = OMIT_VALUE;
	}

	/* 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.hdr() = OMIT_VALUE;
		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;
}

static
EgprsUlMacDataHeader dec__EgprsUlMacDataHeader_type1(const OCTETSTRING& stream)
{
	EgprsUlMacDataHeader ret_val;

	fprintf(stderr, "FIXME: Not implemented! %s (%s:%u)\n", __func__, __FILE__, __LINE__);

	return ret_val;
}

static
EgprsUlMacDataHeader dec__EgprsUlMacDataHeader_type2(const OCTETSTRING& stream)
{
	EgprsUlMacDataHeader ret_val;

	fprintf(stderr, "FIXME: Not implemented! %s (%s:%u)\n", __func__, __FILE__, __LINE__);

	return ret_val;
}

static
EgprsUlMacDataHeader dec__EgprsUlMacDataHeader_type3(const OCTETSTRING& stream)
{
	TTCN_Buffer ttcn_buffer(stream);
	EgprsUlMacDataHeader ret_val;
	const struct gprs_rlc_ul_header_egprs_3 *egprs3;
	uint8_t tmp;

	egprs3 = static_cast<const struct gprs_rlc_ul_header_egprs_3 *>
		((const void *)ttcn_buffer.get_data());

	ret_val.header__type() = EgprsHeaderType::RLCMAC__HDR__TYPE__3;
	ret_val.tfi() = egprs3->tfi_lo << 2 | egprs3->tfi_hi << 0;
	ret_val.countdown() = egprs3->cv;
	tmp = egprs3->si;
	ret_val.foi__si() = BITSTRING(1, &tmp);
	tmp = egprs3->r;
	ret_val.r__ri() = BITSTRING(1, &tmp);
	ret_val.bsn1() = egprs3->bsn1_lo << 5 | egprs3->bsn1_hi << 0;
	ret_val.cps() = egprs3->cps_lo << 2 | egprs3->cps_hi << 0;
	ret_val.pfi__ind() = egprs3->pi;
	tmp = egprs3->rsb;
	ret_val.rsb() = BITSTRING(1, &tmp);
	tmp = egprs3->spb;
	ret_val.spb() = BITSTRING(2, &tmp);

	ttcn_buffer.increase_pos(sizeof(*egprs3));
	return ret_val;
}

RlcmacUlEgprsDataBlock dec__RlcmacUlEgprsDataBlock(const OCTETSTRING& stream)
{
	RlcmacUlEgprsDataBlock ret_val;
	TTCN_Buffer ttcn_buffer(stream);
	TTCN_Buffer aligned_buffer;
	int num_llc_blocks = 0;
	unsigned int data_block_bits, data_block_offsets[2];
	unsigned int num_calls;
	const uint8_t *ti_e;

	ret_val.mcs() = payload_len_2_coding_scheme(stream.lengthof());
	switch (ret_val.mcs()) {
	case CodingScheme::MCS__1:
	case CodingScheme::MCS__2:
	case CodingScheme::MCS__3:
	case CodingScheme::MCS__4:
		ret_val.mac__hdr() = dec__EgprsUlMacDataHeader_type3(stream);
		break;
	case CodingScheme::MCS__5:
	case CodingScheme::MCS__6:
		ret_val.mac__hdr() = dec__EgprsUlMacDataHeader_type2(stream);
		break;
	case CodingScheme::MCS__7:
	case CodingScheme::MCS__8:
	case CodingScheme::MCS__9:
		ret_val.mac__hdr() = dec__EgprsUlMacDataHeader_type1(stream);
		break;
	}
	setup_rlc_mac_priv(ret_val.mcs(), ret_val.mac__hdr().header__type(), true,
			   &num_calls, &data_block_bits, data_block_offsets);
	get_egprs_data_block(ttcn_buffer, data_block_offsets[0], data_block_bits, aligned_buffer);

	ti_e = aligned_buffer.get_read_data();
	ret_val.tlli__ind() = *ti_e & 0x02 ? true : false;
	ret_val.e() = *ti_e & 0x01 ? true : false;
	aligned_buffer.increase_pos(1);

	/* Manually decoder remainder of aligned_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.e() == false) {
		/* extension octet follows, i.e. optional Llc length octets */
		while (1) {
			/* decode one more extension octet with LlcBlocHdr inside */
			EgprsLlcBlock lb;
			lb.hdr()().decode(EgprsLlcBlockHdr_descr_, aligned_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;
		}
	}

	/* parse optional TLLI */
	if (ret_val.tlli__ind()) {
		ret_val.tlli() = OCTETSTRING(4, aligned_buffer.get_read_data());
		aligned_buffer.increase_pos(4);
	} else {
		ret_val.tlli() = OMIT_VALUE;
	}
	/* parse optional PFI */
	if (ret_val.mac__hdr().pfi__ind()) {
		ret_val.pfi().decode(RlcmacUlEgprsDataBlock_pfi_descr_, aligned_buffer, TTCN_EncDec::CT_RAW);
	} else {
		ret_val.pfi() = OMIT_VALUE;
	}

	/* RLC blocks at end */
	if (ret_val.e() == true) {
		EgprsLlcBlock lb;
		unsigned int length = aligned_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.hdr() = OMIT_VALUE;
		lb.payload() = OCTETSTRING(length, aligned_buffer.get_read_data());
		aligned_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 > aligned_buffer.get_read_len())
					length = aligned_buffer.get_read_len();
				ret_val.blocks()[i].payload() = OCTETSTRING(length, aligned_buffer.get_read_data());
				aligned_buffer.increase_pos(length);
			}
		}
	}

	return ret_val;
}

RlcmacUlBlock dec__RlcmacUlBlock(const OCTETSTRING& stream)
{
	RlcmacUlBlock ret_val;
	size_t stream_len = stream.lengthof();
	CodingScheme::enum_type cs_mcs = payload_len_2_coding_scheme(stream_len);
	unsigned char pt;

	switch (cs_mcs) {
	case CodingScheme::CS__1:
	case CodingScheme::CS__2:
	case CodingScheme::CS__3:
	case CodingScheme::CS__4:
		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);
		break;
	case CodingScheme::MCS__1:
	case CodingScheme::MCS__2:
	case CodingScheme::MCS__3:
	case CodingScheme::MCS__4:
	case CodingScheme::MCS__5:
	case CodingScheme::MCS__6:
	case CodingScheme::MCS__7:
	case CodingScheme::MCS__8:
	case CodingScheme::MCS__9:
		ret_val.data__egprs() = dec__RlcmacUlEgprsDataBlock(stream);
		break;
	}

	return ret_val;
}


/////////////////////
// ENCODE
/////////////////////

/* ENCODE DOWNLINK */

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());
		}
	}

	encode_trailing_padding_spb(ttcn_buffer, in.cs());

	ttcn_buffer.get_string(ret_val);
	return ret_val;
}

static
void enc__RlcmacDlEgprsDataHeader_type1(const EgprsDlMacDataHeader& si, TTCN_Buffer& ttcn_buffer)
{
	fprintf(stderr, "FIXME: Not implemented! %s (%s:%u)\n", __func__, __FILE__, __LINE__);
}

static
void enc__RlcmacDlEgprsDataHeader_type2(const EgprsDlMacDataHeader& si, TTCN_Buffer& ttcn_buffer)
{
	fprintf(stderr, "FIXME: Not implemented! %s (%s:%u)\n", __func__, __FILE__, __LINE__);
}

static
void enc__RlcmacDlEgprsDataHeader_type3(const EgprsDlMacDataHeader& si, TTCN_Buffer& ttcn_buffer)
{
	fprintf(stderr, "FIXME: Not implemented! %s (%s:%u)\n", __func__, __FILE__, __LINE__);
}

OCTETSTRING enc__RlcmacDlEgprsDataBlock(const RlcmacDlEgprsDataBlock& si)
{
	RlcmacDlEgprsDataBlock 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.e() = true;
	else
		in.e() = false;

	switch (in.mac__hdr().header__type()) {
	case EgprsHeaderType::RLCMAC__HDR__TYPE__1:
		enc__RlcmacDlEgprsDataHeader_type1(si.mac__hdr(), ttcn_buffer);
		break;
	case EgprsHeaderType::RLCMAC__HDR__TYPE__2:
		enc__RlcmacDlEgprsDataHeader_type2(si.mac__hdr(), ttcn_buffer);
		break;
	case EgprsHeaderType::RLCMAC__HDR__TYPE__3:
		enc__RlcmacDlEgprsDataHeader_type3(si.mac__hdr(), ttcn_buffer);
	default:
		break; /* TODO: error */
	}

	/* 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(EgprsLlcBlockHdr_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());
		}
	}

	encode_trailing_padding_spb(ttcn_buffer, in.mcs());

	ttcn_buffer.get_string(ret_val);
	return ret_val;
}

OCTETSTRING enc__RlcmacDlBlock(const RlcmacDlBlock& si)
{
	if (si.ischosen(RlcmacDlBlock::ALT_data__egprs))
		return enc__RlcmacDlEgprsDataBlock(si.data__egprs());
	else if (si.ischosen(RlcmacDlBlock::ALT_data))
		return enc__RlcmacDlDataBlock(si.data());
	else
		return enc__RlcmacDlCtrlBlock(si.ctrl());
}

/* ENCODE UPLINK */

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 any 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());
		}
	}

	encode_trailing_padding_spb(ttcn_buffer, in.cs());

	ttcn_buffer.get_string(ret_val);
	return ret_val;
}

static
void enc__RlcmacUlEgprsDataHeader_type1(const EgprsUlMacDataHeader& si, TTCN_Buffer& ttcn_buffer)
{
	struct gprs_rlc_ul_header_egprs_1 egprs1;

	egprs1.r = bs2uint8(si.r__ri());
	egprs1.si = bs2uint8(si.foi__si());
	egprs1.cv = si.countdown();
	egprs1.tfi_hi = si.tfi() >> 0;
	egprs1.tfi_lo = si.tfi() >> 2;
	egprs1.bsn1_hi = si.bsn1() >> 0;
	egprs1.bsn1_lo = si.bsn1() >> 5;
	egprs1.bsn2_hi = si.bsn2__offset() >> 0;
	egprs1.bsn2_lo = si.bsn2__offset() >> 2;
	egprs1.cps = si.cps();
	egprs1.rsb = bs2uint8(si.rsb());
	egprs1.pi = si.pfi__ind();
	egprs1.spare_hi = 0;
	egprs1.spare_lo = 0;
	egprs1.dummy = 0;

	ttcn_buffer.put_s(sizeof(egprs1), (const unsigned char *)&egprs1);
}

static
void enc__RlcmacUlEgprsDataHeader_type2(const EgprsUlMacDataHeader& si, TTCN_Buffer& ttcn_buffer)
{
	struct gprs_rlc_ul_header_egprs_2 egprs2;

	egprs2.r = bs2uint8(si.r__ri());
	egprs2.si = bs2uint8(si.foi__si());
	egprs2.cv = si.countdown();
	egprs2.tfi_hi = si.tfi() >> 0;
	egprs2.tfi_lo = si.tfi() >> 2;
	egprs2.bsn1_hi = si.bsn1() >> 0;
	egprs2.bsn1_lo = si.bsn1() >> 5;
	egprs2.cps_hi = si.cps() >> 0;
	egprs2.cps_lo = si.cps() >> 2;
	egprs2.rsb = bs2uint8(si.rsb());
	egprs2.pi = si.pfi__ind();
	egprs2.spare_hi = 0;
	egprs2.spare_lo = 0;
	egprs2.dummy = 0;

	ttcn_buffer.put_s(sizeof(egprs2), (const unsigned char *)&egprs2);
}

static
void enc__RlcmacUlEgprsDataHeader_type3(const EgprsUlMacDataHeader& si, TTCN_Buffer& ttcn_buffer)
{
	struct gprs_rlc_ul_header_egprs_3 egprs3;

	egprs3.r = bs2uint8(si.r__ri());
	egprs3.si = bs2uint8(si.foi__si());
	egprs3.cv = si.countdown();
	egprs3.tfi_hi = si.tfi() >> 0;
	egprs3.tfi_lo = si.tfi() >> 2;
	egprs3.bsn1_hi = si.bsn1() >> 0;
	egprs3.bsn1_lo = si.bsn1() >> 5;
	egprs3.cps_hi = si.cps() >> 0;
	egprs3.cps_lo = si.cps() >> 2;
	egprs3.spb = bs2uint8(si.spb());
	egprs3.rsb = bs2uint8(si.rsb());
	egprs3.pi = si.pfi__ind();
	egprs3.spare = 0;
	egprs3.dummy = 0;

	ttcn_buffer.put_s(sizeof(egprs3), (const unsigned char *)&egprs3);
}

OCTETSTRING enc__RlcmacUlEgprsDataBlock(const RlcmacUlEgprsDataBlock& si)
{
	RlcmacUlEgprsDataBlock in = si;
	OCTETSTRING ret_val;
	TTCN_Buffer ttcn_buffer, aligned_buffer;
	int i;
	unsigned int data_block_bits, data_block_offsets[2];
	unsigned int num_calls;
	CodingScheme mcs;

	mcs = RLCMAC__Templates::f__rlcmac__cps__htype__to__mcs(in.mac__hdr().cps(), in.mac__hdr().header__type());
	//fprintf(stderr, "RLCMAC: infered MCS %s (%d)\n", mcs.enum_to_str(static_cast<CodingScheme::enum_type>(mcs.as_int())), mcs.as_int());

	if (!in.blocks().is_bound()) {
		/* we don't have nay blocks: Add length value (zero) */
		in.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.e() = true; /* E=0: extension octet follows */
	} else {
		/* Length value */
		in.e() = false;
	}

	/* Fix other presence indications */
	in.tlli__ind() = in.tlli().is_bound() && in.tlli() != OMIT_VALUE;
	in.mac__hdr().pfi__ind() = in.pfi().is_bound() && in.pfi() != OMIT_VALUE;

	switch (in.mac__hdr().header__type()) {
	case EgprsHeaderType::RLCMAC__HDR__TYPE__1:
		enc__RlcmacUlEgprsDataHeader_type1(in.mac__hdr(), ttcn_buffer);
		break;
	case EgprsHeaderType::RLCMAC__HDR__TYPE__2:
		enc__RlcmacUlEgprsDataHeader_type2(in.mac__hdr(), ttcn_buffer);
		break;
	case EgprsHeaderType::RLCMAC__HDR__TYPE__3:
		enc__RlcmacUlEgprsDataHeader_type3(in.mac__hdr(), ttcn_buffer);
	default:
		break; /* TODO: error */
	}

	/* Put first TI + E byte */
	aligned_buffer.put_c((in.tlli__ind() & 0x01) << 1 | (in.e() & 0x01) << 0);
	//printbuffer("After encoding first byte", aligned_buffer);

	if (in.e() == false) {
		/* Add LI octets, if any */
		if (!in.blocks().is_bound()) {
			aligned_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(EgprsLlcBlockHdr_descr_, aligned_buffer,
									TTCN_EncDec::CT_RAW);
				}
			}
		}
	}



	if (in.tlli__ind()) {
		/* The TLLI is encoded in little endian for EGPRS (see
		 * TS 44.060, figure 10.3a.2.1, note 2) */
		OCTETSTRING tlli = in.tlli();
		aligned_buffer.put_c(tlli[3].get_octet());
		aligned_buffer.put_c(tlli[2].get_octet());
		aligned_buffer.put_c(tlli[1].get_octet());
		aligned_buffer.put_c(tlli[0].get_octet());
	}

	if (in.mac__hdr().pfi__ind()) {
		in.pfi().encode(RlcmacUlEgprsDataBlock_pfi_descr_, aligned_buffer, TTCN_EncDec::CT_RAW);
	}

	//printbuffer("Before encoding EgprsLlc payload", aligned_buffer);
	if (in.blocks().is_bound()) {
		for (i = 0; i < in.blocks().size_of(); i++) {
			if (!in.blocks()[i].is_bound())
				continue;
			aligned_buffer.put_string(in.blocks()[i].payload());
		}
	}
	//printbuffer("After encoding EgprsLlc payload", aligned_buffer);

	setup_rlc_mac_priv(mcs, in.mac__hdr().header__type(), true,
			   &num_calls, &data_block_bits, data_block_offsets);
	//printbuffer("before merging data block", ttcn_buffer);
	put_egprs_data_block(aligned_buffer, data_block_offsets[0], data_block_bits, ttcn_buffer);
	//printbuffer("after merging data block", ttcn_buffer);

	encode_trailing_padding_spb(ttcn_buffer, in.mcs());

	ttcn_buffer.get_string(ret_val);
	return ret_val;
}

OCTETSTRING enc__RlcmacUlBlock(const RlcmacUlBlock& si)
{
	if (si.ischosen(RlcmacUlBlock::ALT_data__egprs))
		return enc__RlcmacUlEgprsDataBlock(si.data__egprs());
	else if (si.ischosen(RlcmacUlBlock::ALT_data))
		return enc__RlcmacUlDataBlock(si.data());
	else
		return enc__RlcmacUlCtrlBlock(si.ctrl());
}

} // namespace