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-rw-r--r--src/pdu_encode.c307
1 files changed, 307 insertions, 0 deletions
diff --git a/src/pdu_encode.c b/src/pdu_encode.c
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--- /dev/null
+++ b/src/pdu_encode.c
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+/*
+ * PDU Encode
+ *
+ * Copyright (C) 2010 by James Maki
+ *
+ * Author: James Maki <jmaki@multitech.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <ctype.h>
+
+#include "global.h"
+#include "utils.h"
+#include "pdu_encode.h"
+
+#define ENCODE_FAIL(cond, name, ret) \
+do { \
+ if (cond) { \
+ log_error("encode failed at %s", name); \
+ return ret; \
+ } \
+} while (0)
+
+int pdu_encode_timestamp(char *pdu_str, size_t len, struct tm *tm)
+{
+ int tmp;
+ int off_upper;
+ int off_lower;
+ int off;
+ int negative;
+
+ if (len < PDU_TIMESTAMP_SIZE) {
+ log_error("buffer is not large enough to hold a timestamp");
+ return -1;
+ }
+
+ tmp = strftime(pdu_str, PDU_TIMESTAMP_SIZE, "%y%m%d%H%M%S", tm);
+ ENCODE_FAIL(tmp != GMT_OFFSET_IDX, "timestamp", -1);
+
+ off = tm->tm_gmtoff;
+ if (off < 0) {
+ off = -off;
+ negative = 1;
+ }
+ off = off / 60 / 15;
+
+ off_upper = off / 10;
+ off_lower = off % 10;
+
+ if (negative) {
+ off_upper |= BIT(3);
+ }
+
+ snprintf(pdu_str + GMT_OFFSET_IDX, 2, "%X", off_upper & 0xF);
+ snprintf(pdu_str + GMT_OFFSET_IDX + 1, 2, "%X", off_lower & 0xF);
+
+ nibble_swap(pdu_str, PDU_TIMESTAMP_LEN);
+ strpad(pdu_str, PDU_TIMESTAMP_LEN, 'F');
+
+ log_debug("%s", pdu_str);
+
+ return PDU_TIMESTAMP_LEN;
+}
+
+int pdu_encode_addr(char *pdu_str, size_t len, struct pdu_addr *addr, int smsc)
+{
+ char *begin = pdu_str;
+ int addr_len;
+ int tmp;
+
+ addr_len = strlen(addr->addr);
+
+ if (smsc) {
+ if (addr_len) {
+ if (addr_len & 1) {
+ addr_len++;
+ }
+ addr_len = addr_len / HEX_BYTE_LEN + 1;
+ }
+ }
+
+ log_debug("addr-len [transformed]: 0x%02X", addr_len);
+ addr->len = addr_len;
+
+ tmp = hex_byte_encode(pdu_str, len, addr_len);
+ ENCODE_FAIL(tmp != HEX_BYTE_LEN, "addr-len", -1);
+ pdu_str += tmp;
+ len -= tmp;
+
+ if (smsc && !addr_len) {
+ log_debug("smsc addr is empty");
+ goto done;
+ }
+
+ tmp = hex_byte_encode(pdu_str, len, addr->type);
+ ENCODE_FAIL(tmp != HEX_BYTE_LEN, "addr-type", -1);
+ pdu_str += tmp;
+ len -= tmp;
+
+ addr_len = strlen(addr->addr);
+ if (addr_len & 1) {
+ addr_len++;
+ }
+
+ if (len < addr_len + 1) {
+ log_error("buffer is not large enough to hold the addr");
+ return -1;
+ }
+
+ strcpy(pdu_str, addr->addr);
+ strpad(pdu_str, addr_len, 'F');
+ nibble_swap(pdu_str, addr_len);
+ len -= addr_len;
+ pdu_str += addr_len;
+
+done:
+
+ return pdu_str - begin;
+}
+
+#define septet_idx(n) ((n) * 8 / 7)
+
+#define encode_octet(buf, n) \
+shiftr(bit_maskl(cycledown(n, 7) + 1, 7) & buf[septet_idx(n)], cycleup(n, 7)) | \
+shiftl(bit_maskr(cycleup(n, 7) + 1) & buf[septet_idx(n) + 1], cycledown(n, 7) + 1)
+
+int pdu_encode_user_data(char *pdu_str, size_t len, struct pdu_info *pdu)
+{
+ char *begin = pdu_str;
+ int tmp;
+ uint8_t octets[PDU_OCTETS_MAX];
+ int nr_octets;
+ int i;
+
+ if (pdu->data_coding.general.unused) {
+ log_error("data coding group 0x%02X not implemented",
+ pdu->data_coding.data_coding & 0xF0);
+ return -1;
+ }
+
+ if (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT) {
+ log_debug("data coding alphabet is default");
+ } else if (pdu->data_coding.general.alphabet == PDU_ALPHABET_EIGHT) {
+ log_debug("data coding alphabet is eight");
+ } else {
+ log_debug("data coding alphabet 0x%02X not implemented",
+ pdu->data_coding.general.alphabet);
+ return -1;
+ }
+
+ if (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT) {
+ if (pdu->user_data_len > PDU_UD_7BIT_MAX) {
+ log_error("string exceeds 7-bit data max length");
+ return -1;
+ }
+
+ nr_octets = octet_align(pdu->user_data_len);
+ for (i = 0; i < nr_octets; i++) {
+ octets[i] = encode_octet(pdu->user_data, i);
+ }
+ } else {
+ if (pdu->user_data_len > PDU_UD_8BIT_MAX) {
+ log_error("string exceeds 8-bit data max length");
+ return -1;
+ }
+
+ nr_octets = pdu->user_data_len;
+ for (i = 0; i < pdu->user_data_len; i++) {
+ octets[i] = pdu->user_data[i];
+ }
+ }
+
+ if (len < nr_octets * 2 + HEX_BYTE_LEN + 1) {
+ log_error("buffer is not large enough to hold user-data");
+ return -1;
+ }
+
+ tmp = hex_byte_encode(pdu_str, len, pdu->user_data_len);
+ ENCODE_FAIL(tmp != HEX_BYTE_LEN, "user-data-len", -1);
+ pdu_str += tmp;
+ len -= tmp;
+
+ for (i = 0; i < nr_octets; i++) {
+ hex_byte_encode(pdu_str, len, octets[i]);
+ pdu_str += HEX_BYTE_LEN;
+ }
+ len -= nr_octets * 2;
+ pdu_str[i] = '\0';
+
+ log_debug("user-data-len: 0x%02X", pdu->user_data_len);
+ log_debug("nr_octets: 0x%02X", nr_octets);
+
+ return pdu_str - begin;
+}
+
+int pdu_encode(char *pdu_str, size_t len, struct pdu_info *pdu)
+{
+ char *begin = pdu_str;
+ char *msg_begin = pdu_str;
+ int tmp;
+
+ tmp = pdu_encode_addr(pdu_str, len, &pdu->smsc_addr, 1);
+ ENCODE_FAIL(tmp < 0, "smsc-addr", -1);
+ len -= tmp;
+ pdu_str += tmp;
+
+ msg_begin = pdu_str;
+
+ tmp = hex_byte_encode(pdu_str, len, pdu->type.type);
+ ENCODE_FAIL(tmp != HEX_BYTE_LEN, "type", -1);
+ len -= tmp;
+ pdu_str += tmp;
+
+ if (pdu->type.msg_type == PDU_MTI_SUBMIT ||
+ pdu->type.msg_type == PDU_MTI_REPORT) {
+ tmp = hex_byte_encode(pdu_str, len, pdu->msg_reference);
+ ENCODE_FAIL(tmp != HEX_BYTE_LEN, "msg-reference", -1);
+ len -= tmp;
+ pdu_str += tmp;
+ }
+
+ tmp = pdu_encode_addr(pdu_str, len, &pdu->addr, 0);
+ ENCODE_FAIL(tmp < 0, "addr", -1);
+ len -= tmp;
+ pdu_str += tmp;
+
+ switch (pdu->type.msg_type) {
+ case PDU_MTI_REPORT:
+ tmp = pdu_encode_timestamp(pdu_str, len, &pdu->timestamp);
+ ENCODE_FAIL(tmp < 0, "report-timestamp", -1);
+ len -= tmp;
+ pdu_str += tmp;
+
+ break;
+ case PDU_MTI_DELIVER:
+ case PDU_MTI_SUBMIT:
+ tmp = hex_byte_encode(pdu_str, len, pdu->protocol_id);
+ ENCODE_FAIL(tmp != HEX_BYTE_LEN, "protocol-id", -1);
+ len -= tmp;
+ pdu_str += tmp;
+
+ tmp = hex_byte_encode(pdu_str, len, pdu->data_coding.data_coding);
+ ENCODE_FAIL(tmp != HEX_BYTE_LEN, "data-coding-scheme", -1);
+ len -= tmp;
+ pdu_str += tmp;
+
+ if (pdu->type.msg_type == PDU_MTI_SUBMIT) {
+ switch (pdu->type.validity_period_format) {
+ case PDU_VPF_RELATIVE:
+ tmp = hex_byte_encode(pdu_str, len, pdu->validity_period);
+ ENCODE_FAIL(tmp != HEX_BYTE_LEN, "validity-period", -1);
+ len -= tmp;
+ pdu_str += tmp;
+
+ break;
+
+ case PDU_VPF_ENHANCED:
+ log_warning("PDU_VPF_ENHANCED? Falling through to absolute");
+ case PDU_VPF_ABSOUTE:
+ tmp = pdu_encode_timestamp(pdu_str, len, &pdu->timestamp);
+ ENCODE_FAIL(tmp < 0, "validity-period-timestamp", -1);
+ len -= tmp;
+ pdu_str += tmp;
+
+ break;
+
+ case PDU_VPF_NOT_PRESENT:
+ default:
+ break;
+ }
+ } else if (pdu->type.msg_type == PDU_MTI_DELIVER) {
+ tmp = pdu_encode_timestamp(pdu_str, len, &pdu->timestamp);
+ ENCODE_FAIL(tmp < 0, "delivery-timestamp", -1);
+ len -= tmp;
+ pdu_str += tmp;
+ }
+
+ tmp = pdu_encode_user_data(pdu_str, len, pdu);
+ ENCODE_FAIL(tmp < 0, "user-data", -1);
+ len -= tmp;
+ pdu_str += tmp;
+ }
+
+ pdu->msg_len = (pdu_str - msg_begin) / 2;
+ log_debug("msg-len: %d", pdu->msg_len);
+
+ return pdu_str - begin;
+}
+
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