短信发送流程图形剖析(含编码)Android平台.doc

Android平台 短信发送流程图形剖析(含编码)转自：/blog/1306918 其他SMS/MMS分析：/category/187047本文对Android平台短信发送流程进行了走读和剖析，特别是编码部分，今天将流程整理出来，以便平时参考，也希望对大家有用！先上图，下面2个图是用PPT画的，这里截图附上来： 流程图1：Framewoks 流程图2：发送流程编码解析：从上图中的GsmSMSDispatcher的sendText开始分析Java代码 1. /GsmSMSDispatcher.java2. /*inheritDoc*/3. Override4. /入口5. protectedvoidsendText(StringdestAddr,StringscAddr,Stringtext,6. PendingIntentsentIntent,PendingIntentdeliveryIntent)7. SmsMessage.SubmitPdupdu=SmsMessage.getSubmitPdu(/转分析8. scAddr,destAddr,text,(deliveryIntent!=null);9. 10. HashMapmap=SmsTrackerMapFactory(destAddr,scAddr,text,pdu);11. SmsTrackertracker=SmsTrackerFactory(map,sentIntent,deliveryIntent,12. RadioTechnologyFamily.RADIO_TECH_3GPP);13. sendRawPdu(tracker);/转I分析14. 15. 16. 分析：17. /SmsMessage.java18. publicstaticSubmitPdugetSubmitPdu(StringscAddress,19. StringdestinationAddress,Stringmessage,20. booleanstatusReportRequested)21. returngetSubmitPdu(scAddress,destinationAddress,message,statusReportRequested,null);/转分析22. 23. 24. 分析25. /SmsMessage.java26. publicstaticSubmitPdugetSubmitPdu(StringscAddress,27. StringdestinationAddress,Stringmessage,28. booleanstatusReportRequested,byteheader)29. returngetSubmitPdu(scAddress,destinationAddress,message,statusReportRequested,header,ENCODING_UNKNOWN/*默认编码方式*/);/转分析30. 31. 32. 分析编码核心函数33. /SmsMessage.java34. publicstaticSubmitPdugetSubmitPdu(StringscAddress,35. StringdestinationAddress,Stringmessage,36. booleanstatusReportRequested,byteheader,intencoding)37. /338. /Performnullparameterchecks.39. if(message=null|destinationAddress=null)40. returnnull;41. 42. 43. SubmitPduret=newSubmitPdu();44. /MTI=SMS-SUBMIT,UDHI=header!=null45. bytemtiByte=(byte)(0x01|(header!=null?0x40:0x00);46. /MTI:bit0和bit1UDHI：bit647. /0x01=000000010x40=0010000048. ByteArrayOutputStreambo=getSubmitPduHead(49. scAddress,destinationAddress,mtiByte,50. statusReportRequested,ret);/转分析51. /UserData(andlength)/TP-DCS和TP-UDL52. byteuserData;53. if(encoding=ENCODING_UNKNOWN)54. /First,tryencodingitwiththeGSMalphabet55. encoding=ENCODING_7BIT;/默认先采用ENCODING_7BIT编码模式56. 57. try58. if(encoding=ENCODING_7BIT)59. userData=GsmAlphabet.stringToGsm7BitPackedWithHeader(message,header);60. /采用ENCODING_7BIT进行编码，若出现编码异常，函数会抛出异常：EncodeException，转至处。编码成功转至。stringToGsm7BitPackedWithHeader分析转处61. else/assumeUCS-262. try63. userData=encodeUCS2(message,header);64. catch(UnsupportedEncodingExceptionuex)65. Log.e(LOG_TAG,66. ImplausibleUnsupportedEncodingException,67. uex);68. returnnull;69. 70. 71. catch(EncodeExceptionex)/7bit编码模式失败后，就采用UCS-2进行编码72. /Encodingtothe7-bitalphabetfailed.Letsseeifwecan73. /senditasaUCS-2encodedmessage74. try75. userData=encodeUCS2(message,header);76. encoding=ENCODING_16BIT;77. catch(UnsupportedEncodingExceptionuex)78. Log.e(LOG_TAG,79. ImplausibleUnsupportedEncodingException,80. uex);81. returnnull;82. 83. 84. 85. if(encoding=ENCODING_7BIT)/7bit编码成功86. if(0xff&userData0)MAX_USER_DATA_SEPTETS)87. /Messagetoolong88. returnnull;89. 90. /TP-Data-Coding-Scheme91. /Defaultencoding,uncompressed92. /TotestwritingmessagestotheSIMcard,changethisvalue0x0093. /to0x12,whichmeansbits1and0containmessageclass,andthe94. /classis2.Notethatthistakeseffectforthesender.Inother95. /words,messagessentbythephonewiththischangewillendupon96. /thereceiversSIMcard.Youcanthensendmessagestoyourself97. /(onaphonewiththischange)andtheyllendupontheSIMcard.98. /0x12=00010010未压缩，class2，存储到SIM卡99. /0x00=00000000未压缩，class0，GSM7bit编码100. bo.write(0x00);101. else/assumeUCS-2102. if(0xff&userData0)MAX_USER_DATA_BYTES)103. /Messagetoolong104. returnnull;105. 106. /TP-Data-Coding-Scheme107. /Class3,UCS-2encoding,uncompressed108. bo.write(0x0b);/0x0b=00001011未压缩，class3，UCS-2编码109. 110. 111. /(noTP-Validity-Period)112. bo.write(userData,0,userData.length);113. ret.encodedMessage=bo.toByteArray();114. returnret;115. 116. 117. 分析118. /SmsMessage.java119. privatestaticByteArrayOutputStreamgetSubmitPduHead(120. StringscAddress,StringdestinationAddress,bytemtiByte,121. booleanstatusReportRequested,SubmitPduret)122. /scAddress为短信中心号码，destinationAddress为目标地址号码123. /mtiByte为MTI和UDHI编码数据，见上面分析，statusReportRequested为状态报告/ret下面会写入数据到ret124. 125. ByteArrayOutputStreambo=newByteArrayOutputStream(126. MAX_USER_DATA_BYTES+40);127. 128. /SMSCaddresswithlengthoctet,or0129. if(scAddress=null)130. ret.encodedScAddress=null;131. else132. ret.encodedScAddress=PhoneNumberUworkPortionToCalledPartyBCDWithLength(133. scAddress);134. 135. /TP-Message-Type-Indicator(andfriends)136. if(statusReportRequested)137. /SetTP-Status-Report-Requestbit./TP-SRRbit5,0x20=00100000138. mtiByte|=0x20;139. if(Config.LOGD)Log.d(LOG_TAG,SMSstatusreportrequested);140. 141. bo.write(mtiByte);142. 143. /spaceforTP-Message-Reference/TP-MR144. bo.write(0);145. 146. bytedaBytes;147. 148. daBytes=PhoneNumberUworkPortionToCalledPartyBCD(destinationAddress);149. 150. /destinationaddresslengthinBCDdigits,ignoringTONbyteandpad151. /TODOShouldbebetter.152. bo.write(daBytes.length-1)*2153. -(daBytesdaBytes.length-1&0xf0)=0xf0?1:0);154. 155. /destinationaddress156. bo.write(daBytes,0,daBytes.length);157. 158. /TP-Protocol-Identifier/TP-PID159. bo.write(0);160. returnbo;161. 162. 163. 分析164. /GsmAlphabet.java165. publicstaticbytestringToGsm7BitPackedWithHeader(Stringdata,byteheader)166. throwsEncodeException/这里传进来的head为null167. 168. if(header=null|header.length=0)169. returnstringToGsm7BitPacked(data);/转分析170. 171. 172. intheaderBits=(header.length+1)*8;173. intheaderSeptets=(headerBits+6)/7;174. 175. byteret=stringToGsm7BitPacked(data,headerSeptets,true);176. 177. /Pasteintheheader178. ret1=(byte)header.length;179. System.arraycopy(header,0,ret,2,header.length);180. returnret;181. 182. 183. 分析184. /GsmAlphabet.java185. publicstaticbytestringToGsm7BitPacked(Stringdata)186. throwsEncodeException187. returnstringToGsm7BitPacked(data,0,true);/转分析188. 189. 190. 分析191. /GsmAlphabet.java192. publicstaticbytestringToGsm7BitPacked(Stringdata,intstartingSeptetOffset,193. booleanthrowException)throwsEncodeException194. intdataLen=data.length();195. intseptetCount=countGsmSeptets(data,throwException)+startingSeptetOffset;196. /当传入的字符串data中含有charToGsm,charToGsmExtended中没有的字符时(例如汉字)，该函数会抛出异常，这样在调用处会捕获该异常。然后会采用UCS-2方式进行编码。197. 198. if(septetCount255)199. thrownewEncodeException(Payloadcannotexceed255septets);200. 201. intbyteCount=(septetCount*7)+7)/8;202. byteret=newbytebyteCount+1;/Includespaceforonebytelengthprefix.203. for(inti=0,septets=startingSeptetOffset,bitOffset=startingSeptetOffset*7;204. idataLen&septetsseptetCount;205. i+,bitOffset+=7)206. charc=data.charAt(i);207. intv=GsmAlphabet.charToGsm(c,throwException);208. if(v=GSM_EXTENDED_ESCAPE)209. v=GsmAlphabet.charToGsmExtended(c);/Lookuptheextendedchar.210. packSmsChar(ret,bitOffset,GSM_EXTENDED_ESCAPE);211. bitOffset+=7;212. septets+;213. 214. packSmsChar(ret,bitOffset,v);215. septets+;216. 217. ret0=(byte)(septetCount);/Validatedbycheckabove.218. returnret;219. 220. 221. I分析:222. /SMSDispatcher.java223. protectedvoidsendRawPdu(SmsTrackertracker)224. HashMapmap=tracker.mData;225. bytepdu=(byte)map.get(pdu);226. 227. PendingIntentsentIntent=tracker.mSentIntent;228. if(mSmsSendDisabled)229. if(sentIntent!=null)230. try231. sentIntent.send(RESULT_ERROR_NO_SERVICE);232. catch(CanceledExceptionex)233. 234. Log.d(TAG,Devicedoesnotsupportsendingsms.);235. return;236. 237. 238. if(pdu=null)239. if(sentIntent!=null)240. try241. sentIntent.send(RESULT_ERROR_NULL_PDU);242. catch(CanceledExceptionex)243. 244. return;245. 246. 247. intss=mPhone.getServiceState().getState();248. 249. /ifIMSnotregisteredondataandvoiceisnotavailable.250. if(!isIms()&ss!=S