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iu_helpers: fix encoding of BCD (like IMSI) into OCTET STING

This commit is contained in:
Harald Welte 2015-09-11 17:35:52 +02:00
parent 393f2bd9fb
commit 208b7b0778
2 changed files with 8 additions and 6 deletions
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13
src/iu_helpers.c
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@ -25,22 +25,23 @@ int decode_iu_bcd(char *out, size_t out_len, const uint8_t *in, size_t in_len)
int encode_iu_imsi(uint8_t *out, size_t out_len, const char *in)
{
unsigned int len = strlen(in);
unsigned int octlen;
uint8_t odd = (len & 0x01) == 1;
unsigned int off = 0;
unsigned int i;
len /= 2;
octlen = len/2;
if (odd)
len++;
octlen++;
for (i = 0; i < len; i++) {
for (i = 0; i < octlen; i++) {
uint8_t lower, upper;
lower = osmo_char2bcd(in[++off]) & 0x0f;
if (!odd && off + 1 == len)
lower = osmo_char2bcd(in[off++]) & 0x0f;
if (odd && off == len)
upper = 0x0f;
else
upper = osmo_char2bcd(in[++off]) & 0x0f;
upper = osmo_char2bcd(in[off++]) & 0x0f;
out[i] = (upper << 4) | lower;
}

1
src/iu_helpers.h
View File

@ -1,6 +1,7 @@
#pragma once
#include <stdint.h>
#include <sys/types.h>
int decode_iu_bcd(char *out, size_t out_len, const uint8_t *in, size_t in_len);
int encode_iu_imsi(uint8_t *out, size_t out_len, const char *in);