Java PDU Short Message decoding comprehensive analysis _java

Long and long letter not verified interested can try

Rewritten according to the Python method.

/** * PDU SMS Resolution * * * @param pdupayload * @return/public static String Retrievesmsinfo (byte[] pdupayload) throws Unsuppo  rtedencodingexception {int startpos = 3;//#Originator address int mrp_oa_len = Pdupayload[startpos]; byte[] Mrp_oa = new
Byte[mrp_oa_len];
System.arraycopy (Pdupayload, startpos + 1, Mrp_oa, 0, Mrp_oa_len);
startpos = startpos + 1 + mrp_oa_len;
int mtpdu_len = Pdupayload[startpos]; #BIT No. 7 6 5 4 3 2 1 0//#uplink tp-rp tp-udhi tp-spr tp-vpf tp-rd tp-mti//#downlink tp-rp tp-udhi Tp-sri Tp-mms TP
-MTI byte Tp_header = pdupayload[startpos + 1];
byte Tp_msg_ref = Pdupayload[startpos + 2]; int Tp_udhi = (tp_header >> 6) & 1; #短信内容是否包含协议头信息, 0 does not contain, 1 contains (short letter, push sms) int TP_VPF = (tp_header >> 3) & 3; 
#是否包含有效期字节, 0 not included, other include//#00表示无有效期, TP-VP set to 00. 
#10表示相对格式, TP-VP occupies 1 bytes. 
#01表示增加格式, TP-VP occupies 7 bytes. #11表示绝对格式, TP-VP occupies 7 byte int tp_mms = (tp_header >> 2) & 1;//# Tp-mms (tp-more-message-to-send): 1 Message Center No more messages sent St Artpos = Startpos +3;
#对方号码 byte Smsnumberlen = Pdupayload[startpos];
int Mtp_da_len = (Smsnumberlen + 1)/2 + 1;
byte[] Mtp_da = new Byte[mtp_da_len];
System.arraycopy (Pdupayload, startpos + 1, mtp_da, 0, Mtp_da_len * 1);
byte Mtp_da_format = mtp_da[0];
byte[] Smsnumberraw = new Byte[mtp_da.length-1];
System.arraycopy (Mtp_da, 1, smsnumberraw, 0, mtp_da.length-1);
String smsnumber = "";
int j = 0; for (int i = 0; i < Smsnumberlen i++) {if ((I & 1) = = 0) {Smsnumber = smsnumber + (int) (Smsnumberraw[j] & 0
XF);
else {Smsnumber = smsnumber + (int) (Smsnumberraw[j] & 0x0ff) >> 4; j + +}}
startpos = startpos + 1 + mtp_da_len;
byte mtp_pid = Pdupayload[startpos];
byte Mtp_dcs = pdupayload[startpos + 1];//# "00" means 7-bit encoding, set to "02" Using 8-bit encoding, set to "08" Using UCS2 encoding.
startpos = startpos + 2; if (TP_VPF = = 2) {startpos = startpos + 1;} else if (TP_VPF = = 1 | | TP_VPF = = 3) {startpos = startpos + 7;}//# long letter: Content before the need to increase 6 fields//# 1, byte one: Baotou length, fixed fill 0x05;//# 2, byte two: Baotou type identification, fixed fill in 0x00, indicating length Letter;//# 3, ByteThree: The length of the child package, fixed fill 0x03, represents the length of the following three bytes;//# 4, byte four to byte six: package content://# a) byte four: Long message reference number, each SP to send each user a reference number should be different, can start from 0, each plus 1, maximum 255, It is convenient for the same terminal to identify different short and long letters of messages from the same SP;//# b) byte Five: The total number of messages in this long message, from 1 to 255, should generally be greater than 2;//# c) byte Six: The position or serial number of this message in a long message, from 1 to 255, the first is 1, and the second is 2, 
The last value equals four bytes.
# example://# (//#) int smspayloadlen = Pdupayload[startpos]);
startpos = startpos + 1;
String smscontent = ""; 
if (Tp_udhi = = 1) {//#长短信-No validation may be required to turn unsigned byte smstotal = Pdupayload[startpos + 4]; byte Smsidx = Pdupayload[startpos + 5];
startpos = startpos + 6;
Smscontent = "Long Letter (" + Bytetohex (SMSIDX) + "/" + Bytetohex (smstotal) + "}";
Smscontent = new String (smscontent.getbytes ("GBK"));
Smspayloadlen = smsPayloadLen-6;
} byte[] Smspayload = new Byte[pdupayload.length-startpos];
System.arraycopy (Pdupayload, startpos, smspayload, 0, Pdupayload.length-startpos); if (Mtp_dcs = = 0) {//#7位编码-verified Smspayloadlen = (Smspayloadlen * 7 + 7)/8; int asciidata = 0; int lastbyteremain = 0; F or (int i = 0; i < SmspayloaDlen; i++) {Asciidata = Asciidata + ((smspayload[i) & 0x0ff) << lastbyteremain); smscontent = smscontent + (char) (a
Sciidata & 0x0ff) & 0x7f);
Asciidata = Asciidata >> 7;
Lastbyteremain = Lastbyteremain + 1;  if (Lastbyteremain >= 7) {smscontent = smscontent + (char) (Asciidata & 0x0ff) & 0x7f); asciidata = Asciidata
>> 7;
Lastbyteremain = lastByteRemain-7; }} else if (Mtp_dcs = 8) {//# UCS-2-verified to parse for (int i = 0; i < smspayloadlen i = i + 2) {int cc1 = (smspayl
Oad[i] & 0X0FF) * 256;
int CC2 = smspayload[i + 1] & 0x0ff;
Smscontent = smscontent + (char) (CC1 + CC2); } return Smsnumber + ":" + smscontent;}

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