CN103279462A - Data coding/ decoding method suitable for Bei Dou short message civil agreement - Google Patents
Data coding/ decoding method suitable for Bei Dou short message civil agreement Download PDFInfo
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Abstract
The invention provides a data coding/ decoding method suitable for a Bei Dou short message civil agreement. The method includes the steps of diving original communication data into a plurality of ASCII code instruction segments and a plurality of binary system data segments, and storing the ASCII code instruction segments and the binary system data segments in a chain table mode, converting each binary system data segment by using 176 to 240 single byte numerical values to form a Chinese character segment which conforms to a standard, enabling the Chinese character segments to replace original binary system data in a chain table, enabling ASCII code instrument segments in the chain table and the Chinese character segments to form message data according to sequence, and dividing the message data into a plurality of communication telegraph texts which conform to Bei Dou short message requirements according to civil agreement limitation. ASCII codes in a message are kept when decoding is conducted, and reversed decoding is conducted on Chinese characters. Short message transmission of original binary data about the temperature, pressure, the liquid level, the image and the like is achieved, and a specific semantic instrument composed of the ASCII codes is kept. The data coding/ decoding method suitable for the Bei Dou short message civil agreement has the advantages of being simple to calculate, capable of saving the code stream and the like.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of data encoding/decoding method that is applicable to the civilian agreement of Big Dipper short message.
Background technology
Along with the raising of user for Beidou satellite navigation system understanding, the short message function of dipper system also begins to be widely known by the people.The key performance of Big Dipper short message system in disaster relief processes such as Wenchuan earthquake, Zhouqu County's rubble flow, Lushan earthquake makes its application obtain great popularization.
The each service of the civilian agreement of Big Dipper short message system can only be finished the teletext communication of 60 Chinese characters (i.e. 120 bytes) length.In use, the user presses for data capacity and the information load-bearing capacity that improves short message.But because the most of Big Dipper short message terminal device that has appeared on the market at present only designs to transmit the character data (comprising Chinese character and ASCII character) with certain semantic, can't finish the intercommunication mutually of binary data such as image, field data.With the transport vehicle of Big Dipper short message as a kind of industrial data, also need to solve similar problem.
In commercial Application, often use some specific English character strings to form specific interactive instruction, for example " set ", " get " etc. encode to these ASCII character characters again, can increase code stream usually, take limited short message capacity.If use the standard to describe mode, describing a floating data needs 12 ASCII character as 12383.809832, and the floating type data only need use 4 bytes to describe; If 2.3, then only need three bytes.Therefore, design and a kind ofly both can keep ascii character, it is very urgent to carry out the coding method of absolute coding to the raw bytes data of floating type, integer data again.
At present, concentrate on the compression aspect of encode Chinese characters for computer at the correlative study of Big Dipper short message data transmission, can improve the information capacity of short message.But for industrial control field interaction protocol data transmission commonly used, lack corresponding coding techniques support.Solve this encoded question, should be noted that following problem: 1) how instruction code and protocol data are encoded respectively, and exportable effective mixed characters string transmits; 2) how the raw bytes data are become the Chinese character that meets the civilian protocol specification of Big Dipper short message terminal, and save communication flows as much as possible; 3) how to improve the efficient of coding/decoding algorithm, make it to be applicable to that terminal device calculates.
Summary of the invention
The purpose of this invention is to provide a kind of data encoding/decoding method that is applicable to the civilian agreement of Big Dipper short message, binary data is converted to the standard Chinese character, and can keep the ascii character with specific meanings, the data behind the coding can be transmitted by Big Dipper short message terminal device.
Purpose of the present invention is achieved through the following technical solutions:
A kind of data encoding/decoding method that is applicable to the civilian agreement of Big Dipper short message comprised the steps: in coding stage
Step 1: the original communication data are divided into a plurality of ASCII character instruction segments and binary data section, each paragraph as a node, is inserted data link table according to sequencing and stores;
Step 2: being benchmark with each the binary data section node in the data link table with three bytes is divided into a plurality of son sections according to the sequencing of data storage, and each son section is converted into two Chinese characters that meet " Chinese Character Set Code for Informati baseset " standard according to mapping algorithm; Finish being converted to a Chinese character string, be referred to as the Chinese data section; Use corresponding binary data section node in the Chinese data section replacement data chained list;
Step 3: the ASCII character instruction segment node in the data link table and Chinese data section node according to the order of the front and back in this data link table, are combined into coded data from front to back, and the size of calculation code data;
Step 4: coded data is divided into one or more is no more than the civilian agreement length restriction of Big Dipper short message, be i.e., the communication text that meet Big Dipper short message requirement complete less than 120 bytes, Chinese character.
It is as follows that employed binary data is converted to the mapping algorithm idiographic flow of Chinese character in the above-mentioned steps 2:
The first step: generate unsigned character type (unsigned char) the coding lookup table of 65 byte-sized, its numerical value sexadecimal form from front to back is: 0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0;
Second the step: with per three bytes of binary data be one the coding input block, each the coding input block have binary mode 24 bit data; Per four bytes are as a coding output unit, and each coding output unit has binary mode 32 bit data; Coding output unit number equals the merchant that binary data length adds 2 backs and 3;
The 3rd step: input block 24 bit data of will encoding are numbered 0 to 3 by preceding 4 parts that then are equally divided into; Every part has binary mode 6 bit data, and the numerical values recited of every part is 0 to 63, searches the coding lookup table that generates in the first step according to the numerical values recited of every part as the address offset amount, the value of correspondence is stored in the byte of coding output unit correspondence;
The 4th step: in the time of can not being divided exactly (namely size is not 3 integral multiple) by 3 as if the binary data size: when remainder is 1, last two representative numerical value of last byte multiply by the numerical value that obtains after 16 searches the coding lookup table that generates in the first step as the address offset amount, the value of correspondence is stored in the 2nd byte of corresponding coding output unit, and latter two byte of coding output unit uses 0xF0 to fill; When remainder is 2, last 4 representative numerical value of last byte multiply by the numerical value that obtains after 4 searches the coding lookup table that generates in the first step as the address offset amount, the value of correspondence is stored in the 2nd byte of corresponding coding output unit, and last byte of corresponding output unit uses 0xF0 to fill.
A kind of binary data hybrid coding/coding/decoding method that is applicable to Big Dipper short message the resulting coded data of coding stage step 3 be divided into one or more complete no longer than 120 bytes, Chinese character, to meet the communication text idiographic flow that Big Dipper short message requires as follows:
The first step: the length L of calculation code data, rule are that each Chinese character is two bytes, and each ASCII character is a byte;
Second step: coded data is divided into N section initial communication text after by forward direction, and N equals coded data length and adds 119 backs and 120 merchant; The primary data length l of the 1st to N-1 section
(1N-1)Equal the merchant of L and N; The initial length l of N section
NLength for remaining data;
The 3rd step: the unsigned value of checking the 1st section last byte representative: if this is worth for greater than 0 and less than 127, then this section is finished dealing with; If being worth, this is V, and V is arranged more than or equal to 176 and smaller or equal to i.e. 240 〉=V 〉=176 of 240(), then calculate byte value from back to front more than or equal to 176 and smaller or equal to 240 quantity C by this byte address, until running into first ineligible byte or arriving the top of this section; If quantity C is even number, then this section is finished dealing with; If quantity C is odd number, then first section last byte removed, the section that is inserted into second section is first, becomes second section first byte, and first segment length after the processing becomes l
(1N-1)1, this section is finished dealing with;
The 4th step: after handling first section, if second segment length greater than initial length and equal 121, then needs the 121st byte removed, the section that is inserted into the 3rd section is first; Length to the 3rd section makes a decision, and does and second section same treatment; Handle successively, until final stage, equal 121 if handle the length of final stage well, then need to increase a segmentation, the quantity of the text of finally communicating by letter is N+1;
The 5th step: after finishing for the 4th step, if communication text quantity is constant, then the 2nd to N-1 section is done the same iterative processing of the 3rd step, finally finish segmentation, the independent Big Dipper communication text of each section conduct sends successively; If communication text quantity adds 1, then need coded data is carried out segmentation again, by being divided into the N+1 section behind the forward direction, the primary data length t of the 1st to N section
(1N)Equal the merchant of L and N+1, the initial length t of N+1 section
N+1Length for remaining data;
The 6th step: each data segment after the segmentation is again done same iterative processing in the 3rd step after by forward direction, and finally finish segmentation, the independent Big Dipper communication text of each section conduct sends successively.
A kind of data encoding/decoding method that is applicable to the civilian agreement of Big Dipper short message comprises the steps: at decode phase
Step 1: the Big Dipper short message that receives according to sequencing, by preceding several ASCII character character strings and the Chinese character string of then being divided into, and is inserted data link table according to sequencing and stores; The corresponding unsigned character type of Big Dipper short message data respective byte data value is 0 to 127 for ASCII character number of characters value tag, and 176 to 240 for needing the Chinese character numerical characteristics of decoding;
Step 2: the number N that detects each the Chinese character string Chinese character in the data link table
Cn, the Chinese character number must be even number; As not being even number, need to wait for next bar Big Dipper short message, decoding again after the order splicing;
Step 3: the byte quantity that each Chinese character string occupies is N
CnTwice, the corresponding length of its decoding output is N
BinBinary data; Unsigned character type data value is 240 byte quantity N in the calculating Chinese character string
B0, N then
BinEqual N
CnMultiply by the merchant of 3 backs and 2;
Step 4: with each Chinese character string by preceding then be divided into several the decoding input block; Each decoding input block comprises two Chinese characters, totally four bytes; The quantity of decoding input block is N
CnHalf; The corresponding decoding output unit of each decoding input block, each decoding output unit comprises 3 bytes, totally 24 bit data;
Step 5: the unsigned character type data value V that judges each first byte of decoding input block
eIf, 240〉V
e〉=176, then this value is deducted 176 and obtain one less than 64 output valve; Convert this output valve to six bits, be filled into the 1st to the 6th of decoding output unit; Same second byte of operation decodes input block is filled into six bits of output the 7th to the 12nd of decoding output unit; The 3rd byte of operation decodes input block is filled into decoding the 13rd to the 18th of output unit with six bits of output; The 4th byte of operation decodes input block is filled into decoding the 19th to the 24th of output unit with six bits of output; If the unsigned character type data value of certain byte of decoding input block is 240, then decoding stops, and it is invalid that the decoding output unit position of this byte correspondence and subsequent data bit are;
Step 6: be N according to the length that is filled into by preceding order then described in the step 3 with the effective byte in the decoding output unit of character string correspondence
BinBinary data in, thereby finish the decoding of this Chinese character string;
Step 7: handle each the Chinese character string in the data link table successively, the binary data that uses decoding to obtain substitutes former Chinese character string;
Step 8: the ASCII character character string in the data link table and decoding are obtained binary data according to being filled into the final data space by preceding order then, finish decoding.
By above technical scheme provided by the invention as can be seen, ASCII character instruction segment in the communication data that the present invention will need to encode and binary data section are separately handled, and the binary data section is converted into the Chinese character that meets " Chinese Character Set Code for Informati baseset " standard.Data behind the coding can directly be sent by Big Dipper short message terminal after segmentation.Only need during decoding just can distinguish instruction segment and data segment according to the byte number value tag.The entire method calculated amount is little, and coding output volume recruitment has solved the problem that present most of Big Dipper terminal device can not send binary data less than 1/3rd, can effectively expand the application of Big Dipper short message.Therefore, this method has a good application prospect.
Description of drawings
In order to be illustrated more clearly in technical scheme of the present invention, will do simple the introduction to the accompanying drawing of required use in embodiment or the description of the Prior Art below.Obviously, the accompanying drawing that describes below only is some embodiments of the present invention.
Fig. 1 is towards the process flow diagram of Big Dipper short message communication to ASCII character instruction and binary data hybrid coding in the embodiment of the invention;
Fig. 2 forms synoptic diagram to ASCII character instruction and binary data hybrid coding method with the data link table that the segmentation of original communication data generates towards the communication of Big Dipper short message in the embodiment of the invention;
Fig. 3 is that the coding input block of binary data section under different length in the embodiment of the invention formed synoptic diagram;
Fig. 4 be in the embodiment of the invention coding stage single encoded input block the processing procedure synoptic diagram;
Fig. 5 is to receiving the process flow diagram that Big Dipper short message coded data is decoded in the embodiment of the invention;
Fig. 6 is to receiving the data link table composition synoptic diagram that the segmentation of Big Dipper short message coded data generates in the embodiment of the invention;
Fig. 7 is the processing procedure synoptic diagram of the single decoding input block of decode phase in the embodiment of the invention
Embodiment
Below in conjunction with the accompanying drawing of the embodiment of the invention, the technical scheme among the embodiment is clearly and completely described.
The embodiment of the invention provides a kind of data encoding/decoding method that is applicable to the civilian agreement of Big Dipper short message.At first introduce the workflow of the original communication data coding stage comprise ASCII character instruction and binary data, Fig. 1 has described the related procedure of this embodiment, comprising:
101, the original communication data are carried out segmentation;
Comprise the ASCII character strings of commands and the corresponding correlation parameter of this instruction with certain semantic in the original communication data.These correlation parameters exist with the form of binary data, therefore are referred to as binary data.In coding stage, the distinct original communication data of application program and relevant device are formed, so staged operation does not have ambiguity.In the present embodiment, an ASCII character instruction segment must corresponding binary data section during segmentation.Certainly, the present invention is applicable to the situation that binary data is only arranged.
102, the ASCII character instruction segment after the segmentation and binary data section are deposited in the data chained list;
Data link table is a kind of data structure, and one of its characteristics are to have directivity.To divide good ASCII character instruction segment and binary data section to deposit this data link table in according to sequencing.The composition of this data link table as shown in Figure 2, data link table have a M data node, its numbering is by No. 0 beginning, finishes for M-1 number.ASCII character instruction segment and binary data section be staggered depositing in chained list, No. 0 back end storage be the ASCII character instruction segment, a node storage is the binary data section thereafter, M is 2 integral multiple as can be known.
103, each the binary data section in the data link table is converted to GB2312 Chinese character string, and uses this Chinese character string to replace its position in chained list;
The core thinking that the binary data section is converted to GB2312 Chinese character string is that the binary data with three bytes is converted to two Chinese characters.Therefore, pay close attention to the multiple relation of byte quantity in the binary data section and 3, Fig. 3 has shown the feature of the string of binary characters of different length.
As shown in Figure 3, a length is n, and namely byte quantity is the binary data section of n, and byte number is 0 to n-1.During conversion, from byte 0, with 3 continuous bytes as one the coding input block.Coding is output as a Chinese character string, and it can be used as a continuous data space, and from the first byte in this space, 4 continuous bytes are as a coding output unit, and the quantity that defines coding output unit in this space is m.
Among Fig. 3,301 have shown when byte number is 3 integral multiple the coding input block distribution situation in the binary data section.Coding input block quantity is N, and N equals the merchant of n and 3.At this moment, the quantity m of coding output unit equals N.
Among Fig. 3,302 have shown when byte number n has more 2 bytes than 3 integral multiple coding input block distribution situation in the binary data section.Coding input block quantity N equals the merchant of n and 3, but the quantity m of coding output unit equals N+1.
Among Fig. 3,303 have shown when byte number n has more 1 byte than 3 integral multiple coding input block distribution situation in the binary data section.Coding input block quantity N equals the merchant of n and 3, but the quantity m of coding output unit equals N+1.
Specific to the conversion process of single encoded input block to corresponding coding output unit, Fig. 4 has shown concrete processing details.The coding lookup table 401 that at first will to obtain a length be 65 bytes, this look-up table is a continuous storage space when specific implementation.The technical characterictic of having showed the preferred embodiment of the present invention in 401, the character of exporting for guaranteeing to encode is the basic Chinese character in the GB2312 standard, can not produce the cognitive disorders with the ASCII character aliasing, adopt the numerical value of unsigned character type data value between 176 to 240 as map unit, its 16 relevant system representations are: 0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0.Thus, the Chinese character string that obtains after the conversion only may comprise 4161 standard Chinese characters in the GB2312 baseset.
Fig. 4 shows that a coding input block 402 that embodiment chooses to show transfer process, carries out segmentation with 3 bytes in the coding input block 402 according to 6.As the 1st, the lowest order of byte 2 is as the 24th with the most significant digit of byte 0 in 402.Its numerical value is 6 of 404 correspondences as the first son section with the 1st to the 6th, as the addressing side-play amount, searches corresponding map unit with this numerical value in coding lookup table 401, thereby obtains the map unit 0xB6 of 409 correspondences.Deposit the map unit that obtains in 403 coding output unit bytes 0.Equally, obtain the 7th to the 12nd second son section, the total map unit 410 of numerical value 59 corresponding coding lookup tables 401 in its value 405 deposits its value 0xEB in 403 coding output unit bytes 1.So, handle coding input block 402 the 13rd to the 18th, the 19th to the 24th.Finally obtain two Chinese characters " high " and " osmium ".
For 301 described situations, all coding input blocks of binary data section are done as above processing can finish conversion.
For 302 described situations, the intact coding of same treatment input block N and all input blocks before, then with byte n-2 in 302 and byte n-1 as a coding input block, as the 1st, the lowest order of byte n-1 is as the 16th with the most significant digit of byte n-2.The 1st to the 6th as the 1st son section, method such as Fig. 4 and above description, and the map unit that obtains deposits the byte 0 of coding output unit in; The 7th to the 12nd as the 2nd son section, method such as Fig. 4 and above description, and the map unit that obtains deposits the byte 1 of coding output unit in; The 13rd to the 16th high 4 as the 3rd field mends 0 for low 2, and the map unit that obtains thus deposits the byte 2 of coding output unit in; It is that 0xF0 fills that the byte 3 of coding output unit is used last unit of 401 coding lookup tables.
For 303 described situations, the intact coding of same treatment input block N and before all input blocks, then with byte n-1 in 303 as a coding input block, as the 1st, the lowest order of byte n-1 is as the 8th with the most significant digit of byte n-1.The 1st to the 6th as the 1st son section, method such as Fig. 4 and above description, and the map unit that obtains deposits the byte 0 of coding output unit in; The 7th to the 8th high 2 as the 2nd son section mends 0 for low 4, deposited in the byte 1 of the output unit of encoding by the corresponding map unit of its value; It is that 0xF0 fills that the byte 2 of coding output unit is used last unit of 401 coding lookup tables with byte 3.
With the respective handling method of the reference of the binary data section in the data link table above 301,302,303, finish conversion, obtain the Chinese character string.The binary data section of relevant position is called the Chinese data section with this Chinese character string in the Chinese character string replacement data chained list that use obtains.
104, the ASCII character instruction segment in the data link table and the Chinese data Duan Youqian that is converted to are then formed coded data;
Data link table after conversion process only comprises ASCII character instruction segment and Chinese data section, and satisfied the requirements all nodes in the data link table are spliced into a character string this moment, and the principle of splicing is from front to back, and the character string that obtains is coded data.
105, coded data is divided into some Big Dipper communication texts, the principle of decomposition is that Big Dipper short message civilian agreement text length restriction and Chinese character are complete;
Through the restriction that 104 coded datas that obtain might exceed civilian agreement 120 bytes of present Big Dipper short message in length, therefore to be decomposed into many communication texts.When decomposing, at first to guarantee the integrality of separation place Chinese character.In addition, need to guarantee that the communication text length after the decomposition is close as far as possible.Idiographic flow is as follows:
The first step: the length L of calculation code data, rule are that each Chinese character is two bytes, and each ASCII character is a byte;
Second step: coded data is divided into N section initial communication text after by forward direction, and N equals coded data length and adds 119 backs and 120 merchant; The primary data length l of the 1st to N-1 section
(1N-1)Equal the merchant of L and N; The initial length l of N section
NLength for remaining data;
The 3rd step: the unsigned value of checking the 1st section last byte representative: if this is worth for greater than 0 and less than 127, then this section is finished dealing with; If being worth, this is V, and V is arranged more than or equal to 176 and smaller or equal to i.e. 240 〉=V 〉=176 of 240(), then calculate byte value from back to front more than or equal to 176 and smaller or equal to 240 quantity C by this byte address, until running into first ineligible byte or arriving the top of this section; If quantity C is even number, then this section is finished dealing with; If quantity C is odd number, then first section last byte removed, the section that is inserted into second section is first, becomes second section first byte, and first segment length after the processing becomes l
(1N-1)1, this section is finished dealing with;
The 4th step: after handling first section, if second segment length greater than initial length and equal 121, then needs the 121st byte removed, the section that is inserted into the 3rd section is first; Length to the 3rd section makes a decision, and does and second section same treatment; Handle successively, until final stage, equal 121 if handle the length of final stage well, then need to increase a segmentation, the quantity of the text of finally communicating by letter is N+1;
The 5th step: after finishing for the 4th step, if communication text quantity is constant, then the 2nd to N-1 section is done the same iterative processing of the 3rd step, finally finish segmentation, the independent Big Dipper communication text of each section conduct sends successively; If communication text quantity adds 1, then need coded data is carried out segmentation again, by being divided into the N+1 section behind the forward direction, the primary data length of the 1st to N section
(1N)Equal the merchant of L and N+1, the initial length of N+1 section
N+1Length for remaining data;
The 6th step: each data segment after the segmentation is again done same iterative processing in the 3rd step after by forward direction, and finally finish segmentation, the independent Big Dipper communication text of each section conduct sends successively.
Thus, the complete coding method of showing the embodiment of the invention.
The embodiment of the invention provides the data encoding/decoding method that is applicable to the civilian agreement of Big Dipper short message.Fig. 5 has described embodiment and has received decoding process behind the code communication text about receiving end, specifically comprises:
501, receive Big Dipper short message, and splice the not communication text of decoding according to the sequencing that receives;
Know that by 105 a complete communication data inclusion might be divided into many Big Dipper communication texts to be transmitted.Therefore, the embodiment of the invention will be set up communication text pond and store the communication text that does not reach decode condition, and communication text to be decoded is spliced according to the sequencing that receives.
502, spliced communication text is decomposed into some ASCII character character strings and Chinese character string, and deposits the decoded data chained list in;
Known that by Fig. 1 the embodiment of the invention has kept the ASCII character instruction segment in coding stage, comprise ASCII character character string and Chinese character string in the coded data, decode procedure is the conversion of finishing the Chinese character string.According to by decomposing spliced communication text behind the forward direction, and with the ASCII character character string and the Chinese character string that obtain, deposit the decoded data chained list in.
ASCII character character byte numerical characteristics is that its unsigned character type numerical value interval is 0 to 127; The composition byte number value tag of Chinese character is that its unsigned character type numerical value interval is 176 to 240.The principle of decomposing is the sudden change of byte number value tag, as current be the ASCII character character, to judging, when run into first byte numerical value not 0 to 127 interval in or when arriving the ending of communication text, then current string decomposition termination.
Structure among the selected embodiment of the present invention in the decoded data chained list is formed as shown in Figure 6, ASCII character character string and Chinese character string stored interleaved, and quantity unanimity.
503, whether the Chinese character quantity of last the character string in the detection decoded data chained list is even number;
Known that by Fig. 4 after single binary data section was converted to the Chinese data section in the embodiment of the invention, the Chinese character quantity in the Chinese data section was even number.But the processing because of 105, continuous Chinese data section may be in two continuous Big Dipper communication texts and transmit in coded data, at this moment the coding text the last item Chinese character string that receives may comprise the odd number Chinese character, then do not satisfy decode condition this moment, need receive next bar Big Dipper short message and do iterative processing again.
Therefore, whether the Chinese character quantity of last the character string in the detection data link table is even number: be then to carry out 504 downwards; Otherwise empty the decoded data chained list and repeat 501 and 502.
504, the decoding of the Chinese character string in the decoded data chained list is converted to the binary data section, and uses this binary data section to replace its position in chained list;
When decoding, at first calculate the Chinese character quantity N in the Chinese character string
Cn, the corresponding length of decoding output is N
BinThe binary data space.Then, the interior unsigned character type data value of calculating Chinese character string storage space is 240 byte quantity N
B0, N then
BinEqual N
CnMultiply by the merchant of 3 backs and 2.Each Chinese character string by preceding several decoding input blocks that then is divided into, is handled one by one again.The quantity of decoding input block is N
CnHalf, the corresponding decoding output unit of each decoding input block.
In the embodiment of the invention, handle the process of single decoding input block as shown in Figure 7, decoding input block 701 comprises two Chinese characters, totally four bytes.Decoding output unit 702 comprises 3 bytes, totally 24 bit data.The most significant digit of decoding output unit 702 bytes 0 is the 1st, and the lowest order of decoding output unit 702 bytes 2 is the 24th.
Judge the unsigned character type data value V of decoding input block 701 bytes 0
eIf, 240〉V
e〉=176, then this value is deducted 176 and obtain one less than 64 output valve.Convert this output valve to six bits, be filled into the 1st to the 6th of decoding output unit 702.The byte 1 of same operation decodes input block 701 is filled into six bits of output the 7th to the 12nd of decoding output unit 702.Operation decodes input block byte 2 is filled into decoding the 13rd to the 18th of output unit with six bits of output.Operation decodes input block 701 bytes 3 are filled into decoding the 19th to the 24th of output unit 702 with six bits of output.If the unsigned character type data value of decoding input block 701 certain byte is 240, then decoding stops, and it is invalid that the decoding output unit position of this byte correspondence and subsequent data bit are.
Be N with the effective byte in the decoding output unit of character string correspondence according to filling length by preceding order then
BinBinary data decoding output region in, thereby finish the decoding of this Chinese character string.Handle each the Chinese character string in the decoded data chained list successively, the binary data section of using decoding to obtain substitutes former Chinese character string.
505, the ASCII character instruction segment in the decoded data chained list and the binary data Duan Youqian that is converted to are then formed decoded data;
506, judge whether decoded data is complete communication protocol inclusion;
In the embodiment of the invention, Fig. 1 shows that original communication data might be divided into several Big Dipper communication text transmission after encoded.Therefore must judge whether the decoded data that obtains under the above-mentioned steps is complete communication protocol inclusion.If the decoded data that the inside, ephemeral data space had last circulation to obtain then needs the data in ephemeral data space are taken out, and splices according to sequencing with the decoded data that newly obtains.The principle of judging is determined in the communication protocol design phase for concrete application, is transparent and unambiguous therefore.If complete communication protocol inclusion then carries out 507; If not complete communication protocol inclusion, then need to transfer iteration then and carry out 501 decoded data is temporary to the ephemeral data space.
507, handle decoded data;
The decoded data here is the complete communication protocol inclusion that obtains through above-mentioned iterative processing, and concrete processing procedure is also determined by concrete application.
Thus, complete whole decode procedure of having set forth the embodiment of the invention.
More than the binary data hybrid coding/coding/decoding method that is applicable to the civilian agreement of Big Dipper short message that the embodiment of the invention is provided be described in detail, the explanation of above embodiment just is used for helping to understand method of the present invention and thought thereof.Simultaneously, for those skilled in the art, according to thought of the present invention, all can change to some extent in specific embodiments and applications.Therefore, the embodiment of the invention should not be construed as the restriction to content of the present invention.
Claims (4)
1. a data-encoding scheme that is applicable to the civilian agreement of Big Dipper short message is characterized in that this method comprises the steps:
Step 1: the original communication data are divided into a plurality of ASCII character instruction segments and binary data section, each paragraph as a node, is inserted data link table according to sequencing and stores;
Step 2: being benchmark with each the binary data section node in the data link table with three bytes is divided into a plurality of son sections according to the sequencing of data storage, and each son section is converted into two Chinese characters that meet " Chinese Character Set Code for Informati baseset " standard according to mapping algorithm; Finish being converted to a Chinese character string, be referred to as the Chinese data section; Use corresponding binary data section node in the Chinese data section replacement data chained list;
Step 3: the ASCII character instruction segment node in the data link table and Chinese data section node according to the order of the front and back in this data link table, are combined into coded data from front to back, and the size of calculation code data;
Step 4: coded data is divided into one or more is no more than the civilian agreement length restriction of Big Dipper short message, be i.e., the communication text that meet Big Dipper short message requirement complete less than 120 bytes, Chinese character.
2. a kind of data-encoding scheme that is applicable to the civilian agreement of Big Dipper short message according to claim 1 is characterized in that: it is as follows that described binary data is converted to the mapping algorithm idiographic flow of Chinese character:
The first step: generate the unsigned character type coding lookup table of 65 byte-sized, its numerical value sexadecimal form from front to back is: 0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0;
Second the step: with per three bytes of binary data be one the coding input block, each the coding input block have binary mode 24 bit data; Per four bytes are as a coding output unit, and each coding output unit has binary mode 32 bit data; Coding output unit number equals the merchant that binary data length adds 2 backs and 3;
The 3rd step: input block 24 bit data of will encoding are numbered 0 to 3 by preceding 4 parts that then are equally divided into; Every part has binary mode 6 bit data, and the numerical values recited of every part is 0 to 63, searches the coding lookup table that generates in the first step according to the numerical values recited of every part as the address offset amount, the value of correspondence is stored in the byte of coding output unit correspondence;
The 4th step: in the time of can not being divided exactly by 3 as if the binary data size: when remainder is 1, last two representative numerical value of last byte multiply by the numerical value that obtains after 16 searches the coding lookup table that generates in the first step as the address offset amount, the value of correspondence is stored in the 2nd byte of corresponding coding output unit, and latter two byte of coding output unit uses 0xF0 to fill; When remainder is 2, last 4 representative numerical value of last byte multiply by the numerical value that obtains after 4 searches the coding lookup table that generates in the first step as the address offset amount, the value of correspondence is stored in the 2nd byte of corresponding coding output unit, and last byte of corresponding output unit uses 0xF0 to fill.
3. a kind of data-encoding scheme that is applicable to the civilian agreement of Big Dipper short message according to claim 1 is characterized in that: coded data is divided into one or more as follows no longer than 120 bytes, Chinese character communication text idiographic flow complete, that meet the requirement of Big Dipper short message:
The first step: the length L of calculation code data, rule are that each Chinese character is two bytes, and each ASCII character is a byte;
Second step: coded data is divided into N section initial communication text after by forward direction, and N equals coded data length and adds 119 backs and 120 merchant; The primary data length l of the 1st to N-1 section
(1N-1)Equal the merchant of L and N; The initial length l of N section
NLength for remaining data;
The 3rd step: the unsigned value of checking the 1st section last byte representative: if this is worth for greater than 0 and less than 127, then this section is finished dealing with; Be V if this is worth, and V arranged more than or equal to 176 and smaller or equal to 240, then calculate byte value from back to front more than or equal to 176 and smaller or equal to 240 quantity C by this byte address, until running into first ineligible byte or arriving the top of this section; If quantity C is even number, then this section is finished dealing with; If quantity C is odd number, then first section last byte removed, the section that is inserted into second section is first, becomes second section first byte, and first segment length after the processing becomes l
(1N-1)1, this section is finished dealing with;
The 4th step: after handling first section, if second segment length greater than initial length and equal 121, then needs the 121st byte removed, the section that is inserted into the 3rd section is first; Length to the 3rd section makes a decision, and does and second section same treatment; Handle successively, until final stage, equal 121 if handle the length of final stage well, then need to increase a segmentation, the quantity of the text of finally communicating by letter is N+1;
The 5th step: after finishing for the 4th step, if communication text quantity is constant, then the 2nd to N-1 section is done the same iterative processing of the 3rd step, finally finish segmentation, the independent Big Dipper communication text of each section conduct sends successively; If communication text quantity adds 1, then need coded data is carried out segmentation again, by being divided into the N+1 section behind the forward direction, the primary data length t of the 1st to N section
(1N)Equal the merchant of L and N+1, the initial length t of N+1 section
N+1Length for remaining data;
The 6th step: each data segment after the segmentation is again done same iterative processing in the 3rd step after by forward direction, and finally finish segmentation, the independent Big Dipper communication text of each section conduct sends successively.
4. a data decoding method that is applicable to the civilian agreement of Big Dipper short message is characterized in that this method comprises the steps:
Step 1: the Big Dipper short message that receives according to sequencing, by preceding several ASCII character character strings and the Chinese character string of then being divided into, and is inserted data link table according to sequencing and stores; The corresponding unsigned character type of Big Dipper short message data respective byte data value is 0 to 127 for ASCII character number of characters value tag, and 176 to 240 for needing the Chinese character numerical characteristics of decoding;
Step 2: the number N that detects each the Chinese character string Chinese character in the data link table
Cn, the Chinese character number must be even number; As not being even number, need to wait for next bar Big Dipper short message, decoding again after the order splicing;
Step 3: the byte quantity that each Chinese character string occupies is N
CnTwice, the corresponding length of its decoding output is N
BinBinary data; Unsigned character type data value is 240 byte quantity N in the calculating Chinese character string
B0, N then
BinEqual N
CnMultiply by the merchant of 3 backs and 2;
Step 4: with each Chinese character string by preceding then be divided into several the decoding input block; Each decoding input block comprises two Chinese characters, totally four bytes; The quantity of decoding input block is N
CnHalf; The corresponding decoding output unit of each decoding input block, each decoding output unit comprises 3 bytes, totally 24 bit data;
Step 5: the unsigned character type data value V that judges each first byte of decoding input block
eIf, 240〉V
e〉=176, then this value is deducted 176 and obtain one less than 64 output valve; Convert this output valve to six bits, be filled into the 1st to the 6th of decoding output unit; Same second byte of operation decodes input block is filled into six bits of output the 7th to the 12nd of decoding output unit; The 3rd byte of operation decodes input block is filled into decoding the 13rd to the 18th of output unit with six bits of output; The 4th byte of operation decodes input block is filled into decoding the 19th to the 24th of output unit with six bits of output; If the unsigned character type data value of certain byte of decoding input block is 240, then decoding stops, and it is invalid that the decoding output unit position of this byte correspondence and subsequent data bit are;
Step 6: be N according to the length that is filled into by preceding order then described in the step 3 with the effective byte in the decoding output unit of character string correspondence
BinBinary data in, thereby finish the decoding of this Chinese character string;
Step 7: handle each the Chinese character string in the data link table successively, the binary data that uses decoding to obtain substitutes former Chinese character string;
Step 8: the ASCII character character string in the data link table and decoding are obtained binary data according to being filled into the final data space by preceding order then, finish decoding.
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