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broadband-modem,ussd: explain encoding/decoding logic

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This commit is contained in:
Aleksander Morgado
2018-08-21 16:50:15 +00:00
committed by Dan Williams
parent 6838a3f715
commit 3bc9a2dbe2
2 changed files with 16 additions and 4 deletions
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src/mm-broadband-modem.c
+10 -3
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@@ -5167,11 +5167,17 @@ modem_3gpp_ussd_encode (MMIfaceModem3gppUssd *self,
ussd_command = g_byte_array_new ();
/* encode to the current charset */
/* Encode to the current charset (as per AT+CSCS, which is what most modems
* (except for Huawei it seems) will ask for. */
if (mm_modem_charset_byte_array_append (ussd_command,
command,
FALSE,
broadband->priv->modem_current_charset)) {
/* The scheme value does NOT represent the encoding used to encode the string
* we're giving. This scheme reflects the encoding that the modem should use when
* sending the data out to the network. We're hardcoding this to GSM-7 because
* USSD commands fit well in GSM-7, unlike USSD responses that may contain code
* points that may only be encoded in UCS-2. */
*scheme = MM_MODEM_GSM_USSD_SCHEME_7BIT;
/* convert to hex representation */
hex = mm_utils_bin2hexstr (ussd_command->data, ussd_command->len);
@@ -5189,8 +5195,9 @@ modem_3gpp_ussd_decode (MMIfaceModem3gppUssd *self,
{
MMBroadbandModem *broadband = MM_BROADBAND_MODEM (self);
return mm_modem_charset_hex_to_utf8 (reply,
broadband->priv->modem_current_charset);
/* Decode from current charset (as per AT+CSCS, which is what most modems
* (except for Huawei it seems) will ask for. */
return mm_modem_charset_hex_to_utf8 (reply, broadband->priv->modem_current_charset);
}
/*****************************************************************************/