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Bug 738132 - Part 1: add GsmPDUHelper.readDataCodingScheme. r=philikon

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This commit is contained in:
Vicamo Yang 2012-04-23 20:43:32 -03:00
parent 5ce156c88f
commit 4fd6e87bb3
1 changed files with 55 additions and 39 deletions
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94
dom/system/gonk/ril_worker.js
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@ -3320,6 +3320,55 @@ let GsmPDUHelper = {
msg.epid = PDU_PID_DEFAULT;
},
/**
* Read TP-Data-Coding-Scheme(TP-DCS)
*
* @param msg
* message object for output.
*
* @see 3GPP TS 23.040 9.2.3.10, 3GPP TS 23.038 4.
*/
readDataCodingScheme: function readDataCodingScheme(msg) {
let dcs = this.readHexOctet();
// 7 bit is the default fallback encoding.
let encoding = PDU_DCS_MSG_CODING_7BITS_ALPHABET;
switch (dcs & 0xC0) {
case 0x0:
// bits 7..4 = 00xx
switch (dcs & 0x0C) {
case 0x4:
encoding = PDU_DCS_MSG_CODING_8BITS_ALPHABET;
break;
case 0x8:
encoding = PDU_DCS_MSG_CODING_16BITS_ALPHABET;
break;
}
break;
case 0xC0:
// bits 7..4 = 11xx
switch (dcs & 0x30) {
case 0x20:
encoding = PDU_DCS_MSG_CODING_16BITS_ALPHABET;
break;
case 0x30:
if (!dcs & 0x04) {
encoding = PDU_DCS_MSG_CODING_8BITS_ALPHABET;
}
break;
}
break;
default:
// Falling back to default encoding.
break;
}
msg.dcs = dcs;
msg.encoding = encoding;
if (DEBUG) debug("PDU: message encoding is " + encoding + " bit.");
},
/**
* Read GSM TP-Service-Centre-Time-Stamp(TP-SCTS).
*
@ -3357,50 +3406,15 @@ let GsmPDUHelper = {
* length of user data to read in octets.
*/
readUserData: function readUserData(msg, length) {
let dcs = msg.dcs;
if (DEBUG) {
debug("Reading " + length + " bytes of user data.");
debug("Coding scheme: " + dcs);
}
// 7 bit is the default fallback encoding.
let encoding = PDU_DCS_MSG_CODING_7BITS_ALPHABET;
switch (dcs & 0xC0) {
case 0x0:
// bits 7..4 = 00xx
switch (dcs & 0x0C) {
case 0x4:
encoding = PDU_DCS_MSG_CODING_8BITS_ALPHABET;
break;
case 0x8:
encoding = PDU_DCS_MSG_CODING_16BITS_ALPHABET;
break;
}
break;
case 0xC0:
// bits 7..4 = 11xx
switch (dcs & 0x30) {
case 0x20:
encoding = PDU_DCS_MSG_CODING_16BITS_ALPHABET;
break;
case 0x30:
if (!dcs & 0x04) {
encoding = PDU_DCS_MSG_CODING_8BITS_ALPHABET;
}
break;
}
break;
default:
// Falling back to default encoding.
break;
}
if (DEBUG) debug("PDU: message encoding is " + encoding + " bit.");
let paddingBits = 0;
if (msg.udhi) {
msg.header = this.readUserDataHeader();
if (encoding == PDU_DCS_MSG_CODING_7BITS_ALPHABET) {
if (msg.encoding == PDU_DCS_MSG_CODING_7BITS_ALPHABET) {
let headerBits = (msg.header.length + 1) * 8;
let headerSeptets = Math.ceil(headerBits / 7);
@ -3412,7 +3426,7 @@ let GsmPDUHelper = {
}
msg.body = null;
switch (encoding) {
switch (msg.encoding) {
case PDU_DCS_MSG_CODING_7BITS_ALPHABET:
// 7 bit encoding allows 140 octets, which means 160 characters
// ((140x8) / 7 = 160 chars)
@ -3463,6 +3477,7 @@ let GsmPDUHelper = {
// the receiving entity shall for TP-DCS assume a value of 0x00, i.e. the
// 7bit default alphabet.` ~ 3GPP 23.040 9.2.3.27
msg.dcs = 0;
msg.encoding = PDU_DCS_MSG_CODING_7BITS_ALPHABET;
// TP-Protocol-Identifier
if (pi & PDU_PI_PROTOCOL_IDENTIFIER) {
@ -3470,7 +3485,7 @@ let GsmPDUHelper = {
}
// TP-Data-Coding-Scheme
if (pi & PDU_PI_DATA_CODING_SCHEME) {
msg.dcs = this.readHexOctet();
this.readDataCodingScheme(msg);
}
// TP-User-Data-Length
if (pi & PDU_PI_USER_DATA_LENGTH) {
@ -3500,6 +3515,7 @@ let GsmPDUHelper = {
pid: null, // M O M O O M
epid: null, // M O M O O M
dcs: null, // M O M O O X
encoding: null, // M O M O O X
body: null, // M O M O O O
timestamp: null, // M X X X X X
status: null, // X X X X M X
@ -3552,7 +3568,7 @@ let GsmPDUHelper = {
// - TP-Protocolo-Identifier -
this.readProtocolIndicator(msg);
// - TP-Data-Coding-Scheme -
msg.dcs = this.readHexOctet();
this.readDataCodingScheme(msg);
// - TP-Service-Center-Time-Stamp -
msg.timestamp = this.readTimestamp();
// - TP-User-Data-Length -