mirror of git://git.sysmocom.de/ofono
221 lines
5.0 KiB
C
221 lines
5.0 KiB
C
/*
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* This file is part of oFono - Open Source Telephony
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*
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* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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*
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* Contact: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include <glib.h>
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#include <arpa/inet.h>
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#include "iter.h"
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static inline void bcd_to_mccmnc(const uint8_t *restrict bcd,
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char *mcc, char *mnc)
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{
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mcc[0] = '0' + (bcd[0] & 0x0F);
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mcc[1] = '0' + ((bcd[0] & 0xF0) >> 4);
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mcc[2] = '0' + (bcd[1] & 0x0F);
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mcc[3] = '\0';
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mnc[0] = '0' + (bcd[2] & 0x0F);
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mnc[1] = '0' + ((bcd[2] & 0xF0) >> 4);
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mnc[2] = (bcd[1] & 0xF0) == 0xF0 ? '\0' : '0' +
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(bcd[1] & 0xF0);
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mnc[3] = '\0';
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}
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void g_isi_sb_iter_init_full(GIsiSubBlockIter *iter, const void *restrict data,
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size_t len, size_t used, bool longhdr,
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uint16_t sub_blocks)
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{
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if (!data)
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len = used = 0;
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iter->start = (uint8_t *)data + used;
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iter->end = iter->start + len;
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iter->longhdr = longhdr;
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iter->sub_blocks = len > used ? sub_blocks : 0;
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}
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void g_isi_sb_iter_init(GIsiSubBlockIter *iter, const void *restrict data,
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size_t len, size_t used)
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{
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if (!data)
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len = used = 0;
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iter->start = (uint8_t *)data + used;
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iter->end = iter->start + len;
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iter->longhdr = false;
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iter->sub_blocks = len > used ? iter->start[-1] : 0;
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}
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bool g_isi_sb_iter_is_valid(const GIsiSubBlockIter *iter)
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{
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if (!iter)
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return false;
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if (iter->sub_blocks == 0)
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return false;
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if (iter->start + (iter->longhdr ? 4 : 2) > iter->end)
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return false;
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if (iter->start + g_isi_sb_iter_get_len(iter) > iter->end)
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return false;
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return true;
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}
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int g_isi_sb_iter_get_id(const GIsiSubBlockIter *iter)
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{
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if (iter->longhdr)
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return (iter->start[0] << 8) | (iter->start[1]);
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return iter->start[0];
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}
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size_t g_isi_sb_iter_get_len(const GIsiSubBlockIter *iter)
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{
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if (iter->longhdr)
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return (iter->start[2] << 8) | (iter->start[3]);
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return iter->start[1];
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}
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bool g_isi_sb_iter_get_data(const GIsiSubBlockIter *restrict iter,
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void **data, unsigned pos)
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{
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if ((size_t)pos > g_isi_sb_iter_get_len(iter)
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|| iter->start + pos > iter->end)
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return false;
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*data = (void *)iter->start + pos;
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return true;
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}
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bool g_isi_sb_iter_get_byte(const GIsiSubBlockIter *restrict iter,
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uint8_t *byte, unsigned pos)
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{
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if ((size_t)pos > g_isi_sb_iter_get_len(iter)
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|| iter->start + pos > iter->end)
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return false;
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*byte = iter->start[pos];
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return true;
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}
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bool g_isi_sb_iter_get_word(const GIsiSubBlockIter *restrict iter,
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uint16_t *word, unsigned pos)
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{
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uint16_t val;
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if (pos + 1 > g_isi_sb_iter_get_len(iter))
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return false;
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memcpy(&val, iter->start + pos, sizeof(uint16_t));
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*word = ntohs(val);
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return true;
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}
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bool g_isi_sb_iter_get_dword(const GIsiSubBlockIter *restrict iter,
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uint32_t *dword, unsigned pos)
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{
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uint32_t val;
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if (pos + 3 > g_isi_sb_iter_get_len(iter))
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return false;
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memcpy(&val, iter->start + pos, sizeof(uint32_t));
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*dword = ntohl(val);
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return true;
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}
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bool g_isi_sb_iter_get_oper_code(const GIsiSubBlockIter *restrict iter,
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char *mcc, char *mnc, unsigned pos)
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{
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if (pos + 2 > g_isi_sb_iter_get_len(iter))
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return false;
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bcd_to_mccmnc(iter->start + pos, mcc, mnc);
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return true;
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}
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bool g_isi_sb_iter_get_alpha_tag(const GIsiSubBlockIter *restrict iter,
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char **utf8, size_t len, unsigned pos)
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{
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uint8_t *ucs2 = NULL;
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if (pos > g_isi_sb_iter_get_len(iter))
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return false;
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if (!utf8 || len == 0 || pos + len > g_isi_sb_iter_get_len(iter))
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return false;
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ucs2 = iter->start + pos;
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if (ucs2 + len > iter->end)
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return false;
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*utf8 = g_convert((const char *)ucs2, len, "UTF-8//TRANSLIT", "UCS-2BE",
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NULL, NULL, NULL);
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return *utf8 != NULL;
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}
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bool g_isi_sb_iter_get_latin_tag(const GIsiSubBlockIter *restrict iter,
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char **latin, size_t len, unsigned pos)
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{
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uint8_t *str = NULL;
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if (pos > g_isi_sb_iter_get_len(iter))
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return false;
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if (!latin || len == 0 || pos + len > g_isi_sb_iter_get_len(iter))
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return false;
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str = iter->start + pos;
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if (str + len > iter->end)
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return false;
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*latin = g_strndup((char *)str, len);
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return *latin != NULL;
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}
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bool g_isi_sb_iter_next(GIsiSubBlockIter *iter)
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{
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uint8_t len = g_isi_sb_iter_get_len(iter);
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if (len == 0)
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len = iter->longhdr ? 4 : 2;
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if (iter->sub_blocks == 0)
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return false;
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if (iter->start + len > iter->end)
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return false;
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iter->start += len;
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iter->sub_blocks--;
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return true;
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}
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