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gsm_utils.c: cleanup + do not use dynamic memory when decoding 7bit messages

This commit is contained in:
Nico Golde 2012-09-18 14:29:40 +02:00 committed by Harald Welte
parent db75331e06
commit c56a56dc0a
1 changed files with 13 additions and 14 deletions
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27
src/gsm/gsm_utils.c
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@ -2,7 +2,7 @@
* (C) 2008 by Daniel Willmann <daniel@totalueberwachung.de>
* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org>
* (C) 2010 by Nico Golde <nico@ngolde.de>
* (C) 2010-2012 by Nico Golde <nico@ngolde.de>
*
* All Rights Reserved
*
@ -127,9 +127,8 @@ int gsm_7bit_decode_hdr(char *text, const uint8_t *user_data, uint8_t septet_l,
{
int i = 0;
int shift = 0;
uint8_t *rtext = calloc(septet_l, sizeof(uint8_t));
uint8_t tmp;
uint8_t c;
uint8_t next_is_ext = 0;
/* skip the user data header */
if (ud_hdr_ind) {
@ -141,29 +140,29 @@ int gsm_7bit_decode_hdr(char *text, const uint8_t *user_data, uint8_t septet_l,
}
for (i = 0; i < septet_l; i++) {
rtext[i] =
c =
((user_data[((i + shift) * 7 + 7) >> 3] <<
(7 - (((i + shift) * 7 + 7) & 7))) |
(user_data[((i + shift) * 7) >> 3] >>
(((i + shift) * 7) & 7))) & 0x7f;
}
for (i = 0; i < septet_l; i++) {
/* this is an extension character */
if(rtext[i] == 0x1b && i + 1 < septet_l){
tmp = rtext[i+1];
*(text++) = gsm_7bit_alphabet[0x7f + tmp];
i++;
if(c == 0x1b && i + 1 < septet_l){
next_is_ext = 1;
continue;
}
*(text++) = gsm_septet_lookup(rtext[i]);
/* this is an extension character */
if(next_is_ext){
next_is_ext = 0;
*(text++) = gsm_7bit_alphabet[0x7f + c];
} else {
*(text++) = gsm_septet_lookup(c);
}
}
if (ud_hdr_ind)
i += shift;
*text = '\0';
free(rtext);
return i;
}