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changeset 6:86b4f288862d

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libutil: functions for encoding MSISDN record
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 22 Feb 2021 00:41:12 +0000
parents acb4d86e6ed7
children a33d4d8079d2
files libutil/Makefile libutil/gsm7_encode.c libutil/gsm7_encode_table.c libutil/number_encode.c
diffstat 4 files changed, 224 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/libutil/Makefile	Mon Feb 22 00:40:14 2021 +0000
+++ b/libutil/Makefile	Mon Feb 22 00:41:12 2021 +0000
@@ -1,6 +1,6 @@
 CC=	gcc
 CFLAGS=	-O2
-OBJS=	hexstdin.o hexstr.o
+OBJS=	gsm7_encode.o gsm7_encode_table.o hexstdin.o hexstr.o number_encode.o
 LIB=	libutil.a
 
 all:	${LIB}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libutil/gsm7_encode.c	Mon Feb 22 00:41:12 2021 +0000
@@ -0,0 +1,76 @@
+/*
+ * This module implements functions for parsing quoted string
+ * arguments intended for GSM7 string encoding, and actually
+ * encoding them into GSM7 binary strings.
+ */
+
+#include <sys/types.h>
+#include <ctype.h>
+#include <stdio.h>
+
+extern u_char gsm7_encode_table[256];
+
+qstring_arg_to_gsm7(arg, record, maxlen)
+	char *arg;
+	u_char *record;
+	unsigned maxlen;
+{
+	unsigned acclen, nadd;
+	char *cp;
+	int c;
+
+	cp = arg;
+	for (acclen = 0; *cp; ) {
+		c = *cp++;
+		if (c == '\\') {
+			if (*cp == '\0') {
+				fprintf(stderr,
+					"error: dangling backslash escape\n");
+				return(-1);
+			}
+			c = *cp++;
+			if (c >= '0' && c <= '7' && isxdigit(*cp)) {
+				c = ((c - '0') << 4) | decode_hex_digit(*cp++);
+				goto bypass_encoding;
+			}
+			switch (c) {
+			case 'n':
+				c = '\n';
+				goto bypass_encoding;
+			case 'r':
+				c = '\r';
+				goto bypass_encoding;
+			case 'e':
+				c = 0x1B;
+				goto bypass_encoding;
+			case '"':
+			case '\\':
+				break;
+			default:
+				fprintf(stderr,
+				"error: non-understood backslash escape\n");
+				return(-1);
+			}
+		}
+		c = gsm7_encode_table[c];
+		if (c == 0xFF) {
+			fprintf(stderr,
+	"error: character in alpha tag string cannot be encoded in GSM7\n");
+			return(-1);
+		}
+bypass_encoding:
+		if (c & 0x80)
+			nadd = 2;
+		else
+			nadd = 1;
+		if (acclen + nadd > maxlen) {
+			fprintf(stderr,
+			"error: alpha tag string is longer than SIM limit\n");
+			return(-1);
+		}
+		if (c & 0x80)
+			record[acclen++] = 0x1B;
+		record[acclen++] = c & 0x7F;
+	}
+	return(acclen);
+}
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libutil/gsm7_encode_table.c	Mon Feb 22 00:41:12 2021 +0000
@@ -0,0 +1,43 @@
+/*
+ * This library module contains the table for encoding from ISO 8859-1
+ * into the GSM 7-bit default alphabet (03.38 or 23.038).  High bit set
+ * in the output indicates escape encoding, used for ASCII characters
+ * [\]^ and {|}~.  0xFF indicates invalid chars.
+ */
+
+#include <sys/types.h>
+
+u_char gsm7_encode_table[256] = {
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,	/* 0x00 */
+	0xFF, 0xFF, '\n', 0xFF, 0xFF, '\r', 0xFF, 0xFF,
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,	/* 0x10 */
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	' ',  '!',  '"',  '#',  0x02, '%',  '&',  0x27,	/* 0x20 */
+	'(',  ')',  '*',  '+',  ',',  '-',  '.',  '/',
+	'0',  '1',  '2',  '3',  '4',  '5',  '6',  '7',	/* 0x30 */
+	'8',  '9',  ':',  ';',  '<',  '=',  '>',  '?',
+	0x00, 'A',  'B',  'C',  'D',  'E',  'F',  'G',	/* 0x40 */
+	'H',  'I',  'J',  'K',  'L',  'M',  'N',  'O',
+	'P',  'Q',  'R',  'S',  'T',  'U',  'V',  'W',	/* 0x50 */
+	'X',  'Y',  'Z',  0xBC, 0xAF, 0xBE, 0x94, 0x11,
+	0xFF, 'a',  'b',  'c',  'd',  'e',  'f',  'g',	/* 0x60 */
+	'h',  'i',  'j',  'k',  'l',  'm',  'n',  'o',
+	'p',  'q',  'r',  's',  't',  'u',  'v',  'w',	/* 0x70 */
+	'x',  'y',  'z',  0xA8, 0xC0, 0xA9, 0xBD, 0xFF,
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,	/* 0x80 */
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,	/* 0x90 */
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	0xFF, 0x40, 0xFF, 0x01, 0x24, 0x03, 0xFF, 0x5F,	/* 0xA0 */
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,	/* 0xB0 */
+	0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x60,
+	0xFF, 0xFF, 0xFF, 0xFF, 0x5B, 0x0E, 0x1C, 0x09,	/* 0xC0 */
+	0xFF, 0x1F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+	0xFF, 0x5D, 0xFF, 0xFF, 0xFF, 0xFF, 0x5C, 0xFF,	/* 0xD0 */
+	0x0B, 0xFF, 0xFF, 0xFF, 0x5E, 0xFF, 0xFF, 0x1E,
+	0x7F, 0xFF, 0xFF, 0xFF, 0x7B, 0x0F, 0x1D, 0xFF,	/* 0xE0 */
+	0x04, 0x05, 0xFF, 0xFF, 0x07, 0xFF, 0xFF, 0xFF,
+	0xFF, 0x7D, 0x08, 0xFF, 0xFF, 0xFF, 0x7C, 0xFF,	/* 0xF0 */
+	0x0C, 0x06, 0xFF, 0xFF, 0x7E, 0xFF, 0xFF, 0xFF
+};
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libutil/number_encode.c	Mon Feb 22 00:41:12 2021 +0000
@@ -0,0 +1,104 @@
+/*
+ * This module implements functions for encoding phone numbers.
+ */
+
+#include <sys/types.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+digit_char_to_gsm(ch)
+{
+	switch (ch) {
+	case '0':
+	case '1':
+	case '2':
+	case '3':
+	case '4':
+	case '5':
+	case '6':
+	case '7':
+	case '8':
+	case '9':
+		return (ch - '0');
+	case '*':
+		return 0xA;
+	case '#':
+		return 0xB;
+	case 'a':
+	case 'b':
+	case 'c':
+		return (ch - 'a' + 0xC);
+	case 'A':
+	case 'B':
+	case 'C':
+		return (ch - 'A' + 0xC);
+	}
+	return (-1);
+}
+
+void
+pack_digit_bytes(digits, dest, num_digit_bytes)
+	u_char *digits, *dest;
+	unsigned num_digit_bytes;
+{
+	u_char *sp, *dp;
+	unsigned n;
+
+	sp = digits;
+	dp = dest;
+	for (n = 0; n < num_digit_bytes; n++) {
+		*dp++ = sp[0] | (sp[1] << 4);
+		sp += 2;
+	}
+}
+
+encode_phone_number_arg(arg, fixp, mode)
+	char *arg;
+	u_char *fixp;
+{
+	u_char digits[20];
+	unsigned ndigits, num_digit_bytes;
+	char *cp, *endp;
+	int c;
+
+	cp = arg;
+	if (*cp == '+') {
+		fixp[1] = 0x91;
+		cp++;
+	} else
+		fixp[1] = 0x81;
+	if (digit_char_to_gsm(*cp) < 0) {
+inv_arg:	fprintf(stderr, "error: invalid phone number argument\n");
+		return(-1);
+	}
+	for (ndigits = 0; ; ndigits++) {
+		c = digit_char_to_gsm(*cp);
+		if (c < 0)
+			break;
+		cp++;
+		if (ndigits >= 20) {
+			fprintf(stderr, "error: too many number digits\n");
+			return(-1);
+		}
+		digits[ndigits] = c;
+	}
+	if (mode)
+		fixp[0] = ndigits;
+	if (ndigits & 1)
+		digits[ndigits++] = 0xF;
+	num_digit_bytes = ndigits >> 1;
+	if (!mode)
+		fixp[0] = num_digit_bytes + 1;
+	pack_digit_bytes(digits, fixp + 2, num_digit_bytes);
+	if (*cp == ',') {
+		cp++;
+		if (!isdigit(*cp))
+			goto inv_arg;
+		fixp[1] = strtoul(cp, &endp, 0);
+		if (*endp)
+			goto inv_arg;
+	} else if (*cp)
+		goto inv_arg;
+	return(0);
+}