michael@0: /* Any copyright is dedicated to the Public Domain.
michael@0:  * http://creativecommons.org/publicdomain/zero/1.0/ */
michael@0: "use strict";
michael@0: 
michael@0: let RIL = {};
michael@0: SpecialPowers.Cu.import("resource://gre/modules/ril_consts.js", RIL);
michael@0: 
michael@0: // Only bring in what we need from ril_worker/RadioInterfaceLayer here. Reusing
michael@0: // that code turns out to be a nightmare, so there is some code duplication.
michael@0: let PDUBuilder = {
michael@0:   toHexString: function(n, length) {
michael@0:     let str = n.toString(16);
michael@0:     if (str.length < length) {
michael@0:       for (let i = 0; i < length - str.length; i++) {
michael@0:         str = "0" + str;
michael@0:       }
michael@0:     }
michael@0:     return str.toUpperCase();
michael@0:   },
michael@0: 
michael@0:   writeUint16: function(value) {
michael@0:     this.buf += (value & 0xff).toString(16).toUpperCase();
michael@0:     this.buf += ((value >> 8) & 0xff).toString(16).toUpperCase();
michael@0:   },
michael@0: 
michael@0:   writeHexOctet: function(octet) {
michael@0:     this.buf += this.toHexString(octet, 2);
michael@0:   },
michael@0: 
michael@0:   writeSwappedNibbleBCD: function(data) {
michael@0:     data = data.toString();
michael@0:     let zeroCharCode = '0'.charCodeAt(0);
michael@0: 
michael@0:     for (let i = 0; i < data.length; i += 2) {
michael@0:       let low = data.charCodeAt(i) - zeroCharCode;
michael@0:       let high;
michael@0:       if (i + 1 < data.length) {
michael@0:         high = data.charCodeAt(i + 1) - zeroCharCode;
michael@0:       } else {
michael@0:         high = 0xF;
michael@0:       }
michael@0: 
michael@0:       this.writeHexOctet((high << 4) | low);
michael@0:     }
michael@0:   },
michael@0: 
michael@0:   writeStringAsSeptets: function(message, paddingBits, langIndex,
michael@0:                                  langShiftIndex) {
michael@0:     const langTable = RIL.PDU_NL_LOCKING_SHIFT_TABLES[langIndex];
michael@0:     const langShiftTable = RIL.PDU_NL_SINGLE_SHIFT_TABLES[langShiftIndex];
michael@0: 
michael@0:     let dataBits = paddingBits;
michael@0:     let data = 0;
michael@0:     for (let i = 0; i < message.length; i++) {
michael@0:       let septet = langTable.indexOf(message[i]);
michael@0:       if (septet == RIL.PDU_NL_EXTENDED_ESCAPE) {
michael@0:         continue;
michael@0:       }
michael@0: 
michael@0:       if (septet >= 0) {
michael@0:         data |= septet << dataBits;
michael@0:         dataBits += 7;
michael@0:       } else {
michael@0:         septet = langShiftTable.indexOf(message[i]);
michael@0:         if (septet == -1) {
michael@0:           throw new Error(message[i] + " not in 7 bit alphabet "
michael@0:                           + langIndex + ":" + langShiftIndex + "!");
michael@0:         }
michael@0: 
michael@0:         if (septet == RIL.PDU_NL_RESERVED_CONTROL) {
michael@0:           continue;
michael@0:         }
michael@0: 
michael@0:         data |= RIL.PDU_NL_EXTENDED_ESCAPE << dataBits;
michael@0:         dataBits += 7;
michael@0:         data |= septet << dataBits;
michael@0:         dataBits += 7;
michael@0:       }
michael@0: 
michael@0:       for (; dataBits >= 8; dataBits -= 8) {
michael@0:         this.writeHexOctet(data & 0xFF);
michael@0:         data >>>= 8;
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     if (dataBits != 0) {
michael@0:       this.writeHexOctet(data & 0xFF);
michael@0:     }
michael@0:   },
michael@0: 
michael@0:   buildAddress: function(address) {
michael@0:     let addressFormat = RIL.PDU_TOA_ISDN; // 81
michael@0:     if (address[0] == '+') {
michael@0:       addressFormat = RIL.PDU_TOA_INTERNATIONAL | RIL.PDU_TOA_ISDN; // 91
michael@0:       address = address.substring(1);
michael@0:     }
michael@0: 
michael@0:     this.buf = "";
michael@0:     this.writeHexOctet(address.length);
michael@0:     this.writeHexOctet(addressFormat);
michael@0:     this.writeSwappedNibbleBCD(address);
michael@0: 
michael@0:     return this.buf;
michael@0:   },
michael@0: 
michael@0:   // assumes 7 bit encoding
michael@0:   buildUserData: function(options) {
michael@0:     let headerLength = 0;
michael@0:     this.buf = "";
michael@0:     if (options.headers) {
michael@0:       for each (let header in options.headers) {
michael@0:         headerLength += 2; // id + length octets
michael@0:         if (header.octets) {
michael@0:           headerLength += header.octets.length;
michael@0:         }
michael@0:       };
michael@0:     }
michael@0: 
michael@0:     let encodedBodyLength = options.body.length;
michael@0:     let headerOctets = (headerLength ? headerLength + 1 : 0);
michael@0: 
michael@0:     let paddingBits;
michael@0:     let userDataLengthInSeptets;
michael@0:     let headerSeptets = Math.ceil(headerOctets * 8 / 7);
michael@0:     userDataLengthInSeptets = headerSeptets + encodedBodyLength;
michael@0:     paddingBits = headerSeptets * 7 - headerOctets * 8;
michael@0: 
michael@0:     this.writeHexOctet(userDataLengthInSeptets);
michael@0:     if (options.headers) {
michael@0:       this.writeHexOctet(headerLength);
michael@0: 
michael@0:       for each (let header in options.headers) {
michael@0:         this.writeHexOctet(header.id);
michael@0:         this.writeHexOctet(header.length);
michael@0: 
michael@0:         if (header.octets) {
michael@0:           for each (let octet in header.octets) {
michael@0:             this.writeHexOctet(octet);
michael@0:           }
michael@0:         }
michael@0:       }
michael@0:     }
michael@0: 
michael@0:     this.writeStringAsSeptets(options.body, paddingBits,
michael@0:                               RIL.PDU_NL_IDENTIFIER_DEFAULT,
michael@0:                               RIL.PDU_NL_IDENTIFIER_DEFAULT);
michael@0:     return this.buf;
michael@0:   }
michael@0: };