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Fixed SMS receive in PDU: certain length sms last char was missing.

pull/6082/head
Teppo Järvelin 2018-02-22 10:55:13 +02:00 committed by Ari Parkkila
parent 6ccbb59979
commit e99c18c233
2 changed files with 16 additions and 20 deletions
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28
features/cellular/framework/AT/AT_CellularSMS.cpp
View File

@ -895,13 +895,14 @@ nsapi_size_or_error_t AT_CellularSMS::get_sms(char* buf, uint16_t len, char* pho
index+=14;
}
int udl = hex_str_to_int(pdu+index, 2);
index +=2;
int paddingBits = 0;
int parts = 1;
int partnro = 1;
if (userDataHeader) {
// we need to read User Defined Header to know what part number this message is.
index += read_udh_from_pdu(pdu+index, info, partnro, parts, paddingBits);
index += read_udh_from_pdu(pdu+index, info, partnro, paddingBits);
}
if (part_number) {
@ -910,7 +911,7 @@ nsapi_size_or_error_t AT_CellularSMS::get_sms(char* buf, uint16_t len, char* pho
if (msg) {
// we are reading the message
err = read_pdu_payload(pdu+index, dataScheme, msg, paddingBits, partnro == parts);
err = read_pdu_payload(pdu+index, udl, dataScheme, msg, paddingBits);
}
else {
if (dataScheme == 0x00) {
@ -933,9 +934,8 @@ nsapi_size_or_error_t AT_CellularSMS::get_sms(char* buf, uint16_t len, char* pho
}
}
// read params from User DEfined Header
int AT_CellularSMS::read_udh_from_pdu(const char* pdu, sms_info_t *info, int &part_number, int &parts,
int &padding_bits) {
// read params from User Defined Header
int AT_CellularSMS::read_udh_from_pdu(const char* pdu, sms_info_t *info, int &part_number, int &padding_bits) {
int index = 0;
int udhLength = hex_str_to_int(pdu, 2);
@ -943,6 +943,7 @@ int AT_CellularSMS::read_udh_from_pdu(const char* pdu, sms_info_t *info, int &pa
// if there is padding bits then udhlen is octet bigger as we need to keep septet boundary
padding_bits = ((udhLength+1) * 8 ) % 7; // +1 is for udhLength itself
if (padding_bits) {
padding_bits = 7 - padding_bits;
} else {
@ -966,9 +967,8 @@ int AT_CellularSMS::read_udh_from_pdu(const char* pdu, sms_info_t *info, int &pa
index +=4;
}
parts = hex_str_to_int(pdu+index, 2);
if (info) {
info->parts = parts;
info->parts = hex_str_to_int(pdu+index, 2);
}
index +=2;
@ -978,13 +978,11 @@ int AT_CellularSMS::read_udh_from_pdu(const char* pdu, sms_info_t *info, int &pa
return (udhLength*2 + 2); // udh in hex and udhl
}
nsapi_size_or_error_t AT_CellularSMS::read_pdu_payload(const char* pdu, int scheme, char *msg, int padding_bits,
bool last_part)
nsapi_size_or_error_t AT_CellularSMS::read_pdu_payload(const char* pdu, int msg_len, int scheme, char *msg, int padding_bits)
{
if (scheme == 0x00) {
// 7 bit gsm encoding, must do the conversions from hex to 7-bit encoding and to ascii
return unpack_7_bit_gsm_to_str(pdu, strlen(pdu)/2, msg, padding_bits, last_part);
return unpack_7_bit_gsm_to_str(pdu, strlen(pdu)/2, msg, padding_bits, msg_len);
} else if (scheme == 0x04) {
// 8bit scheme so just convert hexstring to charstring
return hex_str_to_char_str(pdu, strlen(pdu), msg);
@ -1261,7 +1259,7 @@ uint16_t AT_CellularSMS::pack_7_bit_gsm_and_hex(const char* str, uint16_t len, c
}
uint16_t AT_CellularSMS::unpack_7_bit_gsm_to_str(const char* str, int len, char *buf, int padding_bits,
bool last_part)
int msg_len)
{
int strCount = 0;
uint16_t decodedCount = 0;
@ -1284,9 +1282,7 @@ uint16_t AT_CellularSMS::pack_7_bit_gsm_and_hex(const char* str, uint16_t len, c
} else if (shift == 6) {
hex_str_to_char_str(str + (strCount-1)*2, 2, &tmp1);
buf[decodedCount] = gsm_to_ascii[(((tmp1>>2)) | (tmp << 6)) & 0x7F];
// we are unpacking the last byte and so tmp is not complete as it's not completed by the next byte.
// unless this is a multipart message and not the last part.
if (!((strCount+1 == len) && last_part)) {
if (decodedCount+1 < msg_len) {
hex_str_to_char_str(str + strCount*2, 2, &tmp);
decodedCount++;
buf[decodedCount] = gsm_to_ascii[(tmp>>1) & 0x7F];

8
features/cellular/framework/AT/AT_CellularSMS.h
View File

@ -200,10 +200,10 @@ private:
int read_sms_params(char *, char *);
void free_linked_list();
void add_info(sms_info_t* info, int index, int part_number);
int read_udh_from_pdu(const char* pdu, sms_info_t *info, int &part_number, int &parts, int &padding_bits);
int read_udh_from_pdu(const char* pdu, sms_info_t *info, int &part_number, int &padding_bits);
nsapi_size_or_error_t get_data_from_pdu(const char* pdu, sms_info_t *info, int *part_number,
char *phone_number = NULL, char *msg = NULL);
nsapi_size_or_error_t read_pdu_payload(const char* pdu, int scheme, char *msg, int padding_bits, bool last_part);
nsapi_size_or_error_t read_pdu_payload(const char* pdu, int msg_len, int scheme, char *msg, int padding_bits);
sms_info_t* get_oldest_sms_index();
bool create_time(const char* time_string, time_t* time);
int compare_time_strings(const char* time_string_1, const char* time_string_2);
@ -229,12 +229,12 @@ private:
* @param len length of the str divided by two as str is hexencoded
* @param buf preallocated destination buffer
* @param padding_bits number of padding bits which were needed to hold the octet boundary
* @param last_part true is last part of the encoded message
* @param msg_len Length of the received message which is coded in str
* @return length of the destination buffer buf
*
*/
uint16_t unpack_7_bit_gsm_to_str(const char* str, int len, char *buf, int padding_bits,
bool last_part);
int msg_len);
};
} // namespace mbed