gisi: Add ISI sub-block iterator

2 files changed, 214 insertions, 0 deletions

diff --git a/gisi/iter.c b/gisi/iter.c
new file mode 100644
index 00000000..dfc6dfa8
--- /dev/null
+++ b/gisi/iter.c
@@ -0,0 +1,155 @@
+/*
+ * This file is part of oFono - Open Source Telephony
+ *
+ * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * Contact: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+#include <glib.h>
+#include <arpa/inet.h>
+
+#include "iter.h"
+
+static inline void bcd_to_mccmnc(const uint8_t *bcd, char *mcc, char *mnc)
+{
+	mcc[0] = '0' + (bcd[0] & 0x0F);
+	mcc[1] = '0' + ((bcd[0] & 0xF0) >> 4);
+	mcc[2] = '0' + (bcd[1] & 0x0F);
+	mcc[3] = '\0';
+
+	mnc[0] = '0' + (bcd[2] & 0x0F);
+	mnc[1] = '0' + ((bcd[2] & 0xF0) >> 4);
+	mnc[2] = (bcd[1] & 0xF0) == 0xF0 ? '\0' : '0' +
+			(bcd[1] & 0xF0);
+	mnc[3] = '\0';
+}
+
+bool g_isi_sb_iter_is_valid(GIsiSubBlockIter *iter)
+{
+	if (!iter || iter->end - iter->start < 2)
+		return false;
+
+	if (iter->start + iter->start[1] > iter->end)
+		return false;
+
+	return true;
+}
+
+uint8_t g_isi_sb_iter_get_id(GIsiSubBlockIter *iter)
+{
+	return iter->start[0];
+}
+
+uint8_t g_isi_sb_iter_get_len(GIsiSubBlockIter *iter)
+{
+	return iter->start[1];
+}
+
+bool g_isi_sb_iter_get_byte(GIsiSubBlockIter *iter, uint8_t *byte, int pos)
+{
+	if (pos > iter->start[1] || iter->start + pos > iter->end)
+		return false;
+
+	*byte = iter->start[pos];
+	return true;
+}
+
+bool g_isi_sb_iter_get_word(GIsiSubBlockIter *iter, uint16_t *word, int pos)
+{
+	uint16_t val;
+
+	if (pos + 1 > iter->start[1])
+		return false;
+
+	memcpy(&val, iter->start + pos, sizeof(uint16_t));
+	*word = ntohs(val);
+	return true;
+}
+
+bool g_isi_sb_iter_get_dword(GIsiSubBlockIter *iter, uint32_t *dword,
+					int pos)
+{
+	uint32_t val;
+
+	if (pos + 3 > iter->start[1])
+		return false;
+
+	memcpy(&val, iter->start + pos, sizeof(uint32_t));
+	*dword = ntohl(val);
+	return true;
+}
+
+bool g_isi_sb_iter_get_oper_code(GIsiSubBlockIter *iter, char *mcc,
+						char *mnc, int pos)
+{
+	if (pos + 2 > iter->start[1])
+		return false;
+
+	bcd_to_mccmnc(iter->start + pos, mcc, mnc);
+	return true;
+}
+
+bool g_isi_sb_iter_get_alpha_tag(GIsiSubBlockIter *iter, char **utf8,
+						int pos)
+{
+	uint8_t *ucs2 = NULL;
+	int len = 0;
+
+	if (pos > iter->start[1])
+		return false;
+
+	len = iter->start[pos] * 2; /* Alpha tags are UCS-2 */
+
+	if (!utf8 || len == 0 || pos + 1 + len > iter->start[1])
+		return false;
+
+	ucs2 = iter->start + pos + 1;
+	*utf8 = g_convert((const char *)ucs2, len, "UTF-8//TRANSLIT", "UCS-2BE",
+				NULL, NULL, NULL);
+	return utf8 != NULL;
+}
+
+bool g_isi_sb_iter_init(const void restrict *data, size_t len, GIsiSubBlockIter *iter)
+{
+	if (!iter || !data || len == 0)
+		return false;
+
+	iter->start = (uint8_t *)data;
+	iter->end = iter->start + len;
+
+	return true;
+}
+
+bool g_isi_sb_iter_next(GIsiSubBlockIter *iter)
+{
+	uint8_t len = iter->start[1] == 0 ? 2 : iter->start[1];
+
+	if (iter->start + len > iter->end)
+		return false;
+
+	iter->start += len;
+	return true;
+}
diff --git a/gisi/iter.h b/gisi/iter.h
new file mode 100644
index 00000000..87ebfdba
--- /dev/null
+++ b/gisi/iter.h
@@ -0,0 +1,59 @@
+/*
+ * This file is part of oFono - Open Source Telephony
+ *
+ * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+ *
+ * Contact: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifndef __GISI_ITER_H
+#define __GISI_ITER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+
+struct _GIsiSubBlockIter {
+	uint8_t *start;
+	uint8_t *end;
+};
+typedef struct _GIsiSubBlockIter GIsiSubBlockIter;
+
+bool g_isi_sb_iter_is_valid(GIsiSubBlockIter *iter);
+bool g_isi_sb_iter_next(GIsiSubBlockIter *iter);
+
+uint8_t g_isi_sb_iter_get_id(GIsiSubBlockIter *iter);
+uint8_t g_isi_sb_iter_get_len(GIsiSubBlockIter *iter);
+
+bool g_isi_sb_iter_get_byte(GIsiSubBlockIter *iter, uint8_t *byte, int pos);
+bool g_isi_sb_iter_get_word(GIsiSubBlockIter *iter, uint16_t *word, int pos);
+bool g_isi_sb_iter_get_dword(GIsiSubBlockIter *iter, uint32_t *dword, int pos);
+bool g_isi_sb_iter_get_oper_code(GIsiSubBlockIter *iter, char *mcc,
+					char *mnc, int pos);
+bool g_isi_sb_iter_get_alpha_tag(GIsiSubBlockIter *iter, char **utf8, int pos);
+bool g_isi_sb_iter_init(const void restrict *data, size_t len,
+			GIsiSubBlockIter *iter);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __GISI_ITER_H */