mirror of https://gerrit.osmocom.org/libosmocore
560 lines
16 KiB
C
560 lines
16 KiB
C
/*
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* (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
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* (C) 2015 by Alexander Chemeris <Alexander.Chemeris@fairwaves.co>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <osmocom/core/bits.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/coding/gsm0503_coding.h>
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#define DUMP_U_AT(b, x, u) do { \
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printf("%s %02x %02x ", osmo_ubit_dump(b + x, 57), b[57 + x], b[58 + x]); \
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printf("%s\n", osmo_ubit_dump(b + 59 + x, 57)); \
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if (u <= x) \
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return; \
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} while(0)
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#define DUMP_S_AT(b, x, u) do { \
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printf("%s %02x %02x ", osmo_hexdump(b + x, 57), b[57 + x], b[58 + x]); \
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printf("%s\n", osmo_hexdump(b + 59 + x, 57)); \
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if (u <= x) \
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return; \
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} while(0)
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/* Similar to OSMO_ASSERT, but does not panic() */
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#define CHECK_RC_OR_RET(exp, action) \
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if (!(exp)) { \
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printf("%s(%s): assert %s failed\n", __func__, action, #exp); \
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return; \
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}
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#ifdef DEBUG
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#define printd(fmt, args...) printf(fmt, ##args)
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#else
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#define printd(fmt, args...)
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#endif
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static inline void dump_ubits(ubit_t *bursts_u, unsigned until)
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{
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printf("U-Bits:\n");
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DUMP_U_AT(bursts_u, 0, until);
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DUMP_U_AT(bursts_u, 116, until);
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DUMP_U_AT(bursts_u, 232, until);
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DUMP_U_AT(bursts_u, 348, until);
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DUMP_U_AT(bursts_u, 464, until);
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DUMP_U_AT(bursts_u, 580, until);
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DUMP_U_AT(bursts_u, 696, until);
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DUMP_U_AT(bursts_u, 812, until);
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}
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static inline void dump_sbits(uint8_t *bursts_s, unsigned until)
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{
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printf("S-Bits:\n");
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DUMP_S_AT(bursts_s, 0, until);
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DUMP_S_AT(bursts_s, 116, until);
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DUMP_S_AT(bursts_s, 232, until);
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DUMP_S_AT(bursts_s, 348, until);
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DUMP_S_AT(bursts_s, 464, until);
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DUMP_S_AT(bursts_s, 580, until);
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DUMP_S_AT(bursts_s, 696, until);
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DUMP_S_AT(bursts_s, 812, until);
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}
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static void test_xcch(uint8_t *l2)
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{
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uint8_t result[23];
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ubit_t bursts_u[116 * 4];
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sbit_t bursts_s[116 * 4];
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int n_errors, n_bits_total;
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int rc;
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/* Encode L2 message */
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printf("Encoding: %s\n", osmo_hexdump(l2, 23));
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rc = gsm0503_xcch_encode(bursts_u, l2);
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CHECK_RC_OR_RET(rc == 0, "encoding");
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/* Prepare soft-bits */
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osmo_ubit2sbit(bursts_s, bursts_u, 116 * 4);
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dump_ubits(bursts_u, 348);
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dump_sbits((uint8_t *)bursts_s, 348);
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/* Destroy some bits */
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memset(bursts_s, 0, 30);
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memset(bursts_s + 116, 0, 30);
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/* Decode, correcting errors */
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rc = gsm0503_xcch_decode(result, bursts_s, &n_errors, &n_bits_total);
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CHECK_RC_OR_RET(rc == 0, "decoding");
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printf("Decoded: %s\n", osmo_hexdump(result, 23));
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printf("xcch_decode: n_errors=%d n_bits_total=%d ber=%.2f\n",
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n_errors, n_bits_total, (float) n_errors / n_bits_total);
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OSMO_ASSERT(n_bits_total == 456);
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OSMO_ASSERT(!memcmp(l2, result, 23));
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printf("\n");
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}
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static void test_rach(uint8_t bsic, uint8_t ra)
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{
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int rc;
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uint8_t result;
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ubit_t bursts_u[36];
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sbit_t bursts_s[36];
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/* Encode L2 message */
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printd("Encoding: %02x\n", ra);
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rc = gsm0503_rach_ext_encode(bursts_u, ra, bsic, false);
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CHECK_RC_OR_RET(rc == 0, "encoding");
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/* Prepare soft-bits */
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osmo_ubit2sbit(bursts_s, bursts_u, 36);
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printd("U-Bits: %s\n", osmo_ubit_dump(bursts_u, 36));
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printd("S-Bits: %s\n", osmo_hexdump((uint8_t *)bursts_s, 36));
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/* Destroy some bits */
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memset(bursts_s + 6, 0, 8);
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/* Decode, correcting errors */
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rc = gsm0503_rach_decode_ber(&result, bursts_s, bsic, NULL, NULL);
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CHECK_RC_OR_RET(rc == 0, "decoding");
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printd("Decoded: %02x\n", result);
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if (ra != result)
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printf("FAIL [RACH]: encoded %u != %u decoded\n", ra, result);
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printd("\n");
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}
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static void test_rach_ext(uint8_t bsic, uint16_t ra)
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{
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int rc;
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uint16_t result = 3000; /* Max ext. RA is 2^11 = 2048 */
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ubit_t bursts_u[36];
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sbit_t bursts_s[36];
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/* Encode L2 message */
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printd("Encoding: %02x\n", ra);
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rc = gsm0503_rach_ext_encode(bursts_u, ra, bsic, true);
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CHECK_RC_OR_RET(rc == 0, "encoding");
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/* Prepare soft-bits */
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osmo_ubit2sbit(bursts_s, bursts_u, 36);
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printd("U-Bits: %s\n", osmo_ubit_dump(bursts_u, 36));
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printd("S-Bits: %s\n", osmo_hexdump((uint8_t *)bursts_s, 36));
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/* Destroy some bits */
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memset(bursts_s + 9, 0, 8);
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/* Decode, correcting errors */
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rc = gsm0503_rach_ext_decode_ber(&result, bursts_s, bsic, NULL, NULL);
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CHECK_RC_OR_RET(rc == 0, "decoding");
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printd("Decoded: %02x\n", result);
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if (ra != result)
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printf("FAIL [RACH ext]: encoded %u != %u decoded\n", ra, result);
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printd("\n");
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}
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static void test_rach_11bit_sample(uint8_t bsic, const sbit_t *payload)
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{
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int n_errors, n_bits_total;
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uint16_t ra11;
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int rc;
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/* Decode, correcting errors */
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rc = gsm0503_rach_ext_decode_ber(&ra11, payload, bsic, &n_errors, &n_bits_total);
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if (rc) {
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printf("%s(): decoding failed (rc=%d)\n", __func__, rc);
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return;
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}
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printf("Decoded RA11: 0x%03x\n", ra11);
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}
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static void test_sch(uint8_t *info)
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{
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uint8_t result[4];
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ubit_t bursts_u[78];
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sbit_t bursts_s[78];
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int rc;
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/* Zero bits 25 and above */
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info[3] &= 1;
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result[3] = 0;
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/* Encode L2 message */
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printf("Encoding: %s\n", osmo_hexdump(info, 4));
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rc = gsm0503_sch_encode(bursts_u, info);
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CHECK_RC_OR_RET(rc == 0, "encoding");
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/* Prepare soft-bits */
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osmo_ubit2sbit(bursts_s, bursts_u, 78);
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printf("U-Bits: %s\n", osmo_ubit_dump(bursts_u, 78));
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printf("S-Bits: %s\n", osmo_hexdump((uint8_t *)bursts_s, 78));
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/* Destroy some bits */
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memset(bursts_s + 6, 0, 10);
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/* Decode, correcting errors */
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rc = gsm0503_sch_decode(result, bursts_s);
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CHECK_RC_OR_RET(rc == 0, "decoding");
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printf("Decoded: %s\n", osmo_hexdump(result, 4));
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OSMO_ASSERT(!memcmp(info, result, 4));
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printf("\n");
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}
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static void test_fr(uint8_t *speech, int len)
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{
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uint8_t result[33];
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ubit_t bursts_u[116 * 8];
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sbit_t bursts_s[116 * 8];
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int n_errors, n_bits_total;
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int rc;
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memset(bursts_u, 0x23, sizeof(bursts_u));
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memset(bursts_s, 0, sizeof(bursts_s));
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/* Encode L2 message */
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printf("Encoding: %s\n", osmo_hexdump(speech, len));
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rc = gsm0503_tch_fr_encode(bursts_u, speech, len, 1);
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CHECK_RC_OR_RET(rc == 0, "encoding");
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/* Prepare soft-bits */
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osmo_ubit2sbit(bursts_s, bursts_u, 116 * 8);
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dump_ubits(bursts_u, 812);
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dump_sbits((uint8_t *)bursts_s, 812);
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/* Destroy some bits */
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memset(bursts_s + 6, 0, 20);
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/* Decode, correcting errors */
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rc = gsm0503_tch_fr_decode(result, bursts_s, 1, len == 31,
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&n_errors, &n_bits_total);
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CHECK_RC_OR_RET(rc == len, "decoding");
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printf("Decoded: %s\n", osmo_hexdump(result, len));
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printf("tch_fr_decode: n_errors=%d n_bits_total=%d ber=%.2f\n",
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n_errors, n_bits_total, (float)n_errors/n_bits_total);
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OSMO_ASSERT(!memcmp(speech, result, len));
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printf("\n");
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}
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static void test_hr(uint8_t *speech, int len)
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{
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uint8_t result[23];
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ubit_t bursts_u[116 * 6];
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sbit_t bursts_s[116 * 6];
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int n_errors, n_bits_total;
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int rc;
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memset(bursts_u, 0x23, sizeof(bursts_u));
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memset(bursts_s, 0, sizeof(bursts_s));
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/* Encode L2 message */
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printf("Encoding: %s\n", osmo_hexdump(speech, len));
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rc = gsm0503_tch_hr_encode(bursts_u, speech, len);
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CHECK_RC_OR_RET(rc == 0, "encoding");
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/* Prepare soft-bits */
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osmo_ubit2sbit(bursts_s, bursts_u, 116 * 6);
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dump_ubits(bursts_u, 580);
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dump_sbits((uint8_t *)bursts_s, 580);
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/* Destroy some bits */
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memset(bursts_s + 6, 0, 20);
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/* Decode, correcting errors */
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rc = gsm0503_tch_hr_decode(result, bursts_s, 0,
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&n_errors, &n_bits_total);
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CHECK_RC_OR_RET(rc == len, "decoding");
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printf("Decoded: %s\n", osmo_hexdump(result, len));
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printf("tch_hr_decode: n_errors=%d n_bits_total=%d ber=%.2f\n",
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n_errors, n_bits_total, (float)n_errors/n_bits_total);
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OSMO_ASSERT(!memcmp(speech, result, len));
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printf("\n");
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}
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struct test_macblock {
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bool is_egprs;
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uint16_t exp_burst_bits;
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uint16_t l2_len;
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uint8_t l2[54];
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};
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static struct test_macblock test_macblock[] = {
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/* Random frame */
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{ false,
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GSM0503_GPRS_BURSTS_NBITS,
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54,
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{ 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
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0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
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0xfa, 0x27, 0x5d, 0x71, 0x7a, 0x59, 0xa8, 0x42,
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0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
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0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
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0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
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0xfa, 0x27, 0x5d, 0x71, 0x7a, 0xa8 }
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},
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/* jolly frame */
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{ false,
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GSM0503_GPRS_BURSTS_NBITS,
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23,
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{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
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0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
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0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 }
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},
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/*
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GSM RLC/MAC: EGPRS DL HEADER
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0... .... .... 0000 = DL TFI: 0
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0... .... crumb 1 of DL TFI (decoded above)
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.00. .... = RRBP: Reserved Block: (N+13) mod 2715648 (0)
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...0 0... = ES/P: RRBP field is not valid (no Polling) (0)
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.... .111 = USF: 7
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01.. .... 0000 0000 .... ...0 = BSN: 1
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01.. .... crumb 2 of BSN (decoded above)
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..00 .... = PR: 0 dB (included) to 3 dB (excluded) less than BCCH level - P0 (0)
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.... 0000 crumb 0 of DL TFI (decoded above)
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0000 0000 crumb 1 of BSN (decoded above)
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.00. .... = SPB (DL): No retransmission (0)
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...1 011. = CPS: MCS-1/P1 (0x0b)
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.... ...0 crumb 0 of BSN (decoded above)
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GSM RLC/MAC: EGPRS DL DATA BLOCK 1 (BSN 1)
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.... ..0. = FBI: Current Block is not last RLC data block in TBF
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.... ...0 = Extension: Extension octet follows immediately
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0000 100. = Length Indicator: 4
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.... ...0 = Extension: Extension octet follows immediately
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0010 000. = Length Indicator: 16
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.... ...1 = Extension: No extension octet follows
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data segment: LI[0]=4 indicates: (Last segment of) LLC frame (4 octets)
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Data (4 bytes)
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Data: 012b2b2b
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[Length: 4]
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data segment: LI[1]=16 indicates: (Last segment of) LLC frame (16 octets)
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Data (16 bytes)
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Data: 43c0012b2b2b2b2b2b2b2b2b2b2b2b2b
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[Length: 16]
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*/
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{ true,
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GSM0503_GPRS_BURSTS_NBITS,
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27,
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{ 0x07, 0x40, 0x00, 0x16, 0x10, 0x42, 0x02, 0x56,
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0x56, 0x56, 0x86, 0x80, 0x03, 0x56, 0x56, 0x56,
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0x56, 0x56, 0x56, 0x56, 0x56, 0x56, 0x56, 0x56,
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0x56, 0x56, 0x00 }
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},
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};
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static void test_pdtch(struct test_macblock *tmb, int len)
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{
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uint8_t result[len];
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ubit_t bursts_u[116 * 4];
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sbit_t bursts_s[116 * 4];
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int n_errors, n_bits_total;
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int rc;
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/* Zero the not coded tail bits */
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switch (len) {
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case 34:
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case 54:
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tmb->l2[len - 1] &= 0x7f;
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result[len - 1] &= 0x7f;
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break;
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case 40:
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tmb->l2[len - 1] &= 0x07;
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result[len - 1] &= 0x07;
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break;
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}
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/* Encode L2 message */
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printf("Encoding: %s\n", osmo_hexdump(tmb->l2, len));
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if (tmb->is_egprs)
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rc = gsm0503_pdtch_egprs_encode(bursts_u, tmb->l2, len);
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else
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rc = gsm0503_pdtch_encode(bursts_u, tmb->l2, len);
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CHECK_RC_OR_RET(rc == (int)tmb->exp_burst_bits, "encoding");
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/* Prepare soft-bits */
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osmo_ubit2sbit(bursts_s, bursts_u, 116 * 4);
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dump_ubits(bursts_u, 348);
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dump_sbits((uint8_t *)bursts_s, 348);
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/* Decode */
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if (tmb->is_egprs) {
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/* gsm0503_pdtch_egprs_decode() is meant to decode EGPRS UL frames, so we cannot use it here */
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rc = gsm0503_pdtch_egprs_decode(result, bursts_s, rc, NULL, &n_errors, &n_bits_total);
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OSMO_ASSERT(rc == -EIO);
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return;
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} else {
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rc = gsm0503_pdtch_decode(result, bursts_s, NULL, &n_errors, &n_bits_total);
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}
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CHECK_RC_OR_RET(rc == len, "decoding");
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printf("Decoded: %s\n", osmo_hexdump(result, len));
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printf("pdtch_decode: n_errors=%d n_bits_total=%d ber=%.2f\n",
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n_errors, n_bits_total, (float)n_errors/n_bits_total);
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OSMO_ASSERT(!memcmp(tmb->l2, result, len));
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printf("\n");
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}
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uint8_t test_l2[][23] = {
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/* Dummy frame */
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{ 0x03, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
|
|
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
|
|
/* Random frame */
|
|
{ 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
|
|
0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
|
|
0xfa, 0x27, 0x5d, 0x71, 0x7a, 0x59, 0xa8 },
|
|
/* jolly frame */
|
|
{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
|
|
0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
|
|
0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
|
|
};
|
|
|
|
/* 11-bit Access Burst soft-bits (payload only) from an EGPRS capable phone (BSIC 63) */
|
|
static const sbit_t test_rach_11bit[6][36] = {
|
|
{ 103, 109, -108, -110, 107, 108, -106, -120, -121,
|
|
-120, -105, 122, -104, -109, 108, 109, -109, -111,
|
|
107, 111, -105, -119, -121, -104, 122, -120, 121,
|
|
-99, -121, -120, -122, -106, 109, 109, -108, -111 },
|
|
|
|
{ 103, 109, -109, -109, 106, 107, -106, -121, -121,
|
|
-120, -106, 121, -120, 117, -122, 101, 109, -122,
|
|
120, -120, 101, 118, 120, 102, -125, 101, 110,
|
|
-120, 121, -101, -121, -118, -121, -106, 108, 121 },
|
|
|
|
{ -121, -122, -104, 123, -104, -108, 122, -104, -121,
|
|
-121, -102, 124, -105, -110, 107, 109, -108, -109,
|
|
121, -122, 101, 107, -121, 105, 108, -110, -107,
|
|
124, -104, -109, 120, -122, 100, 122, 104, -123 },
|
|
|
|
{ -122, -123, -103, 123, -105, -109, 122, -105, -121,
|
|
-120, -104, 122, -120, 121, -101, -122, -120, -120,
|
|
-119, -105, 120, -106, -108, 123, -104, -113, 105,
|
|
122, 101, -122, 119, -122, 117, -121, 119, -122 },
|
|
|
|
{ 105, 110, -109, -109, 107, 108, -108, -120, -120,
|
|
-121, -106, 121, -104, -107, 106, 108, -108, -108,
|
|
108, 107, -105, -120, -122, -104, 122, -119, 121,
|
|
-103, -122, -118, -120, -106, 108, 108, -110, -111 },
|
|
|
|
{ 120, -103, -123, -104, 119, -121, 100, 123, 106,
|
|
-109, -107, 121, -122, 118, -121, 103, 108, -122,
|
|
120, -119, 121, -103, -121, -119, -121, -103, 124,
|
|
-106, -108, 122, -103, -106, 121, -120, 119, -121 },
|
|
};
|
|
|
|
uint8_t test_speech_fr[33];
|
|
uint8_t test_speech_efr[31];
|
|
uint8_t test_speech_hr[15];
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int i, len_l2, len_mb;
|
|
|
|
len_l2 = ARRAY_SIZE(test_l2);
|
|
len_mb = ARRAY_SIZE(test_macblock);
|
|
|
|
for (i = 0; i < len_l2; i++)
|
|
test_xcch(test_l2[i]);
|
|
|
|
for (i = 0; i < 256; i++) {
|
|
test_rach(0x3f, i);
|
|
test_rach(0x00, i);
|
|
test_rach(0x1a, i);
|
|
}
|
|
|
|
for (i = 0; i < 2048; i++) {
|
|
test_rach_ext(0x3f, i);
|
|
test_rach_ext(0x00, i);
|
|
test_rach_ext(0x1a, i);
|
|
}
|
|
|
|
for (i = 0; i < ARRAY_SIZE(test_rach_11bit); i++)
|
|
test_rach_11bit_sample(0x3f, test_rach_11bit[i]);
|
|
printf("\n");
|
|
|
|
for (i = 0; i < len_l2; i++)
|
|
test_sch(test_l2[i]);
|
|
|
|
for (i = 0; i < sizeof(test_speech_fr); i++)
|
|
test_speech_fr[i] = i;
|
|
test_speech_fr[0] = 0xd0;
|
|
test_fr(test_speech_fr, sizeof(test_speech_fr));
|
|
|
|
for (i = 0; i < sizeof(test_speech_efr); i++)
|
|
test_speech_efr[i] = i;
|
|
test_speech_efr[0] = 0xc0;
|
|
test_fr(test_speech_efr, sizeof(test_speech_efr));
|
|
|
|
for (i = 0; i < len_l2; i++)
|
|
test_fr(test_l2[i], sizeof(test_l2[0]));
|
|
|
|
for (i = 0; i < sizeof(test_speech_hr); i++)
|
|
test_speech_hr[i] = i * 17;
|
|
test_speech_hr[0] = 0x00;
|
|
test_hr(test_speech_hr, sizeof(test_speech_hr));
|
|
|
|
for (i = 0; i < len_l2; i++)
|
|
test_hr(test_l2[i], sizeof(test_l2[0]));
|
|
|
|
for (i = 0; i < len_mb; i++) {
|
|
if (test_macblock[i].is_egprs) {
|
|
test_pdtch(&test_macblock[i], test_macblock[i].l2_len);
|
|
} else {
|
|
test_pdtch(&test_macblock[i], 23);
|
|
test_pdtch(&test_macblock[i], 34);
|
|
test_pdtch(&test_macblock[i], 40);
|
|
test_pdtch(&test_macblock[i], 54);
|
|
}
|
|
}
|
|
|
|
printf("Success\n");
|
|
|
|
return 0;
|
|
}
|