CN100401266C - Data coding and decoding method and its coding and decoding device - Google Patents
Data coding and decoding method and its coding and decoding device Download PDFInfo
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- CN100401266C CN100401266C CNB2005100392687A CN200510039268A CN100401266C CN 100401266 C CN100401266 C CN 100401266C CN B2005100392687 A CNB2005100392687 A CN B2005100392687A CN 200510039268 A CN200510039268 A CN 200510039268A CN 100401266 C CN100401266 C CN 100401266C
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Abstract
The present invention discloses a data coding and decoding method and coding and decoding device thereof. The coding and decoding method comprises the steps of extracting the definition information in a data structure of tested objectives so as to generate structure information represented by a user-defined format, reading structure member field data in the user-defined format, editing the structure member field data via a data editing interface, invoking an interface of a universal coding device, constructing structure binary code data streams via the structure information data and the member field data, and obtaining the structure member field data from code stream data according to the structure information data so as to decode. The present invention does not need to change code and repeat compilation in machine format variation. When the data structure is changed, the present invention does not need to be recompiled for detecting purpose codes or detecting tools, and the present invention effectively increases detecting efficiency. The present invention can realize decoding and coding to the configuration data via extracting the structure definition information in tested software objects, and the present invention also provides abundant data editing interfaces.
Description
Technical field
The present invention relates to a kind of general data decoding method, particularly relate to a kind of decoding method and codec thereof of structuring binary code stream.
Background technology
In software development process, be accompanied by requisite software test activity, these activities comprise the system testing of white-box testing, the integration testing between software subsystem and the software product of coding stage.
Popular at C/C++ in the commercial white-box testing instrument at present, such as CppUnit, RationalTest RealTime etc., for the structure of unit testing data particularly at the data configuration of labyrinth, all in code or script, carry out, by mode to structure member's field assignment, thereby generating the static code of corresponding data configuration and tested code together compiles and reaches the purpose of tested code being carried out white-box testing; On the other hand to the processing of test result also be by corresponding test code to member's field value as a result and judged, thereby finish analysis to measured result.Carrying out the software test activity of white box mode in addition, also can be not by commercial testing tool, a kind of in this manner more common pattern is, oneself carries out the organization and management to test case, and the implementation that the generation of test data and front are mentioned in the commercial testing tool is basic identical.
In integration testing and system testing activity at software, the reasonable demand that satisfies the specific area software test of independently developed Software Testing Tool energy; Simulate the software subsystem that needs or system by testing tool and realize test tested object.In the exploitation of these testing tools, unavoidably can relate to the data structure that defines in the data structure that defined in the tested software or the standard agreement document, in instrument is realized, need to construct the data code flow of these structures; General way is the mode of passing through in the particular tool development language member's field assignment at present, generates the static code of corresponding data configuration, finishes the structure to the data code stream in code is carried out; In addition when handling the structure code stream of measurand, by code stream is converted to related data structure, in the particular tool development language, realize texture field member's value realization decoding data by corresponding code.
Find out from above, no matter be at white-box testing at software, still integrated and system testing, in test process, all run into problem to this data code flow structure and parsing, a kind of general tupe that its short summary is adopted as can be seen at present is exactly the structure that has defined in the tested by reference system, in static code by texture field assignment and value operation being finished the structure and the parsing of data code flow.The disadvantage of this mode is exactly that the structure of data and parsing and code bind together, and when writing additional code, the variation of data can cause the change of code and repeat compiling.This in addition test purpose code or the testing tool of being used for, can when compiling, depend on tested code, when tested code has been done the change, particularly test code of version or the data structure that instrument relates to variation, also will cause the recompility of test code and testing tool.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of data decoding method and codec thereof, is used for solving the shortcoming that need recompilate test code and testing tool when the prior art data change.
To achieve these goals, the invention provides a kind of data decoding method, be adapted to general codec, it is characterized in that, comprise the steps:
Step 11: extract the definition information of data structure in the tested object, generate the structural information data of representing with user-defined format;
Step 12: read member's field data of structure in the described user-defined format element, and pass through member's field data of data edition interface edit structure;
Step 13: call the interface of described universaling coder, and by the binary code flow data of described structural information data, member's field data structural texture; And
Step 14:, from described binary code flow data, obtain structure member's field data and decode according to the structural information data of described user-defined format.
Described data decoding method, wherein, the mode that described extraction is adopted changes with the definition mode of described data structure.
Described data decoding method, wherein, described user-defined format adopts expandable mark language XML (Extensible Markup Language) form.
Described data decoding method wherein, is described single member's field data of described data structure by a plurality of elements of XML.
Described data decoding method, wherein, described member's field data comprises: default value, code encoding/decoding mode and the relativity shift information in described data structure.
Described data decoding method, wherein, a coding function in one group of coding/decoding function in the XML element value of described code encoding/decoding mode and the described general codec is corresponding.
Described data decoding method, wherein, the operation that is used for described member's field data comprises:
Obtain structural information data, and return with the XML formal definition;
Value by member's field of structure in the name modifications XML format item of structure and member's field; And
Value by member's field of structure in the name acquiring XML format item of structure and member's field.
Described data decoding method wherein, also comprises the cataloged procedure of single structure member field, and this process comprises again:
Step 81: from the XML format item of general codec, obtain member's field data of structure, comprise coding, value and offset information; And
Step 82: according to the coded message and the value information of described structure member's field, call coded message corresponding codes function, generate the binary code stream of described structure member's field.
Described data decoding method wherein, also comprises the decode procedure of single structure member field, and this process comprises again:
Step 91: the decoding, length and the relativity shift information that from the XML format item, read structure member's field;
Step 92:, obtain the code stream of member's field from the relativity shift of structure code stream according to relativity shift and length information; And
Step 93: the decoded information according to structure member's field calls corresponding decoding functions, and the code stream of member's field is decoded.
To achieve these goals, the present invention also provides a kind of codec of being realized by above-mentioned data decoding method, it is characterized in that, comprising:
One structural information is extracted and is preserved module, is used for extracting the definition information of tested object data structure, reaches storage configuration information data, structure member's field data in the element of described user-defined format;
One data edition interface module connects described structural information extraction and preserves module, is used to edit the value of described structure member's field; And
One coding/decoding module connects described structural information extraction and preserves module, is used to construct described bit stream data, obtains the value information of described structure member's field from described bit stream data.
Described codec, wherein, described data edition interface module comprises the data edition interface of graphic user interface GUI (Graphic User Interface) mode, script mode, and wherein said script comprises Python or TCL (Tool Command Language).
Described codec wherein, also comprises the edition interface of script command mode, is realized by the order extension mechanism expansion script command that script provides.
The present invention is situations about binding together with code to the structure and the parsing of data in the prior art, and when writing additional code, the variation of data can not cause the change of code and repeat compiling; For being used for test purpose code or testing tool, when its data structure changes, do not need this recompility.In addition, the codec that the present invention realizes can be realized encoding and decoding to structured data also providing the rich data edition interface simultaneously by extracting organization definition information in the tested software object.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the application framework figure of scrambler;
Fig. 2 is to use the interface of demoder to carry out an interface hierarchy chart of data edition;
Fig. 3 is the coding process flow diagram of single structure member field; And
Fig. 4 is the decoding process figure of single structure member field.
Wherein, Reference numeral:
10 structure definition file modules
11 general codecs
110 coding/decoding modules
111 data edition interface modules
112 structural informations provide and preserve module
12 application program modules
Embodiment
The present invention proposes a kind of new data decoding method, make in this way the codec realized can realize encoding and decoding structured data by extracting organization definition information in the tested software object.The data decoding method that this is new, the key step that its coding is realized is as follows:
Steps A 1: extract the definition information of data structure, generate the structural information data of representing with self-defined XML form;
Steps A 2: by the data of edition interface edit structure member field;
Steps A 3: the bit stream data that calls the addressable port structural texture.
Wherein, the main effect of steps A 1 is to extract the organization definition information of structural data, can adopt corresponding extracting mode at different organization definition modes for the mode of extracting, in the case description of the present invention at structure, for such as other structural data organization definition processing mode unanimity of the present invention such as ANS.1 mode with standard C definition.
The key step that its decoding realizes is as follows:
Step B1: extract the definition information of data structure, generate the structural information data of representing with self-defined XML form;
Step B2:, the code stream of structure is decoded according to the structrual description information of XML form.
The codec that uses decoding method of the present invention to realize provides the rich data edition interface, patterned data edition interface can be provided, also can provide the data edition interface etc. of script mode by in existing script, embedding new script command.
The decoding method of comprehensive the invention described above, its characteristics are as follows:
(1), adopts the definition information of from the definition source of structure, extracting structure, and represent it with the XML of user-defined format;
(2), depend on the member variable data edition interface that the structural information of representing with XML provides structure, the member variable data of structure also are kept in the XML element of user-defined format;
(3), the data that depend on the structural information represented with XML and preservation provide the structure to the structured data code stream;
(4), depend on the structural information of representing with XML decode operation to the structuring code stream is provided, promptly from structurized code stream, obtain structure member's field data.
Below in conjunction with accompanying drawing in the technical scheme to put the data structure information extraction and detailed description is done in expression, the edition interface of structure member variable and the enforcements such as encoding and decoding of message:
First: the extraction of organization definition information and expression
Definition information by analytical structure, and represent this structural information with user-defined format, the structural information of analyzing can be basic data type or the complicated self-defining data type in the standard C, the data structure of ASN.1 formal definition, or other structured data type, distinguish to some extent according to different application in force.
Decoding method of the present invention has used XML to represent the organization definition information of structural data, and structure member's field value information also is stored in the document of XML form simultaneously.
XML is a kind of suggestion of W3C.From forming structure, an XML document comprises one or a plurality of element, by beginning flag symbol with stop its boundary of identifier mark, each unit have the beginning flag symbol and stops identifier, an element may have a value, and element value places its beginning flag symbol and stops between the identifier.
A plurality of units that the present invention uses XML are the single information about firms of description scheme usually, information about firms comprises data type, default value, code encoding/decoding mode and the relativity shift information in structure, forms description to total by member's XML element descriptor again; The XML element that wherein is used for the description scheme information about firms, the element value of code encoding/decoding mode element correspond to a coding function in one group of coding/decoding function in the general codec, use this coding/decoding function to finish Code And Decode to this structure member.
Organization definition form at the different structure data in concrete enforcement needs different structural information extracting modes or says the implementation that structural information is extracted, and the information of these structures that identical is is all described with same self-defined XML form at last.
At complex data type with the standard C definition, can adopt the static information extractive technique to obtain structural information, on the structural information basis of extracting, generate structural information with the XML format description.
The element that in the XML user-defined format, has following title:
<VALUE>...</VALUE>
<OFFSET>...</OFFSET>
<FUNNAME>...</FUNNAME>
Above-mentioned three elements are used for the value of description scheme element respectively, the relativity shift of structure member's field in structure, the coding/decoding information of structure member's field; Element term is to define voluntarily according to convenience on the implementation, and the difference of title can not influence the enforcement of general codec, importantly the described information of the value of these elements and the encoding and decoding thought of the present invention and the spirit that embody.
Coding/decoding information element among the XML (the FUNNAME element among the top said XML) illustrates: the value and the coding/decoding function in the codec of coding/decoding information element are corresponding, the type of structure member's field that can encoding and decoding is with limit, so the value of coding/decoding information element also is limited among the XML, different texture field type corresponding codes descriptors can dispose, and use when the coding/decoding information element of generating structure member field.
Second: the member variable edition interface of structure
Shown in Figure 1 is the application framework figure of scrambler, be made up of structure definition file module 10, general codec 11 and application program module 12, wherein general codec 11 is provided by coding/decoding module 110, data edition interface module 111 and structural information and preserves module 112 and form; Handle by the file in the structure definition file module 11 is input in the general codec 11, the encoding and decoding structure of output data is in application program module 12.
The definition information that comprises structure in the codec in the data of XML form, the while also comprises the current value information of structure member's field, and edition interface mainly is to edit at the value information of structure member's field; Editor to as if XML in the value of descriptive element VALUE of structure member's field.
Give an example: after a member's value was compiled as 1, its VALUE element was as follows:
<VALUE>1</VALUE>
By in the visit codec with structural information and structure member's field value information of XML format description, one cover user is provided general edition interface to data on this basis, concentrate the user can freely select wherein interface for use at this general edition interface, reach the self-defining data editting function.
General edition interface herein is mainly used in to be operated structure member's field data of storing among the XML.
The general operation that is used for operating XML structure member field data mainly comprises:
(1): obtain the descriptor of structure, return with self-defined XML formal definition;
(2): come the field value of structure member among the XML is made amendment by structure and field name;
(3): the field value of obtaining structure member among the XML by structure and field name.
Fig. 2 is that application person can be regarded as the caller of interface herein from the edition interface function of codec application person's angle explanation codec.The interface interchange hierarchy chart that this figure is application person's general-purpose interface of calling codec when wherein XML structure member field is edited, application person can obtain dependency structure information and the current value of texture field in the interface (interface 1 sign among Fig. 2) by codec, edition interface after the encapsulation that provides by application person comes editing data, data behind the editor are written in the coder-decoder by interface 1, and the data value of structure member's field obtains upgrading.
On the basis of this general edition interface collection, can provide abundanter edition interface flexibly, comprise the data edition interface of GUI mode and the data edition interface of script mode according to application scenarios; Script can be Python or TCL, and the order extension mechanism that can provide by script is therein expanded script command, and the edition interface of script command mode is provided.
Interface 2, interface 3 and interface 4 are respectively the encapsulation edition interfaces that application person provides among Fig. 2, and the edit mode of GUI, script and other type to data is provided.
The the 3rd: the coding of structure
The coding of structure is meant after the related edit mouth that calls general codec is finished editor to structure member's data, the binary code flow data of structural texture.
All members' of traversal coding structure XML element descriptor when coding by the parsing to all member XML elements, and is implemented the respective coding operation, finishes the coding to structure, the bit stream data of generating structure.
Fig. 3 is the coding process flow diagram of single structure member field, has three steps:
Step 31: from the XML of general codec, obtain structure member's information, comprise information such as coding, value and skew;
Step 32:, call coded message corresponding codes function, generating structure member's binary code stream according to structure member's coded message and value information;
Step 33: add structure member's code stream and locate to the member's relativity shift address in this structure.
The the 4th: the decoding of structure
The decoding of structure is to obtain structure member's field value information from the binary code stream of structure, uses the XML descriptor of structure in the general codec, can realize decoding function; The decoding of interrecord structure member field and the relativity shift information in structure among the XML are by the decoding of these information realizations to structure member's field.
Fig. 4 is the decoding process figure of single structure member field, has three steps:
Step 41: the information such as decoding, length and relativity shift that from XML, read structure member's field;
Step 42:, obtain member's code stream from the relativity shift of structure code stream according to relativity shift and length information;
Step 43: the decoded information according to the structure member calls corresponding decoding functions, and member's code stream is decoded.
The present invention has overcome that the structure and the parsing of data is to bind together with code in the prior art, and when writing additional code, the variation of data can cause the change of code and the shortcoming that repeats to compile; For being used for test purpose code or testing tool, when the data structure that relates to when test code or instrument changes, can not need to recompilate test code and testing tool.In addition, use codec that the present invention realizes can realize encoding and decoding to structured data by extracting organization definition information in the tested software object, the rich data edition interface also is provided simultaneously, patterned data edition interface can be provided, also can provide the data edition interface etc. of script mode by in existing script, embedding new script command.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (12)
1. a general codec is characterized in that, comprising:
One structural information provides and preserves module, is used for extracting the definition information of tested object data structure, reaches storage configuration information data in the element of user-defined format;
One data edition interface module, connecting described structural information provides and preserves module, is used to edit the value of member's field of described data structure; And
One coding/decoding module, connecting described structural information provides and preserves module, is used to construct bit stream data, and is used for obtaining from bit stream data the value information of member's field of described data structure.
2. codec according to claim 1 is characterized in that, described data edition interface module comprises the data edition interface of graphic user interface GUI mode, script mode, and wherein said script comprises Python or TCL.
3. codec according to claim 2 is characterized in that, also comprises the edition interface of script command mode, is realized by the order extension mechanism expansion script command that script provides.
4. a data decoding method is applicable in the general codec as claimed in claim 1, it is characterized in that, comprising:
Step 11: extract the definition information of data structure in the tested object, generate the structural information data of representing with user-defined format;
Step 12: read member's field data of data structure in the described user-defined format element, and pass through the value of member's field data of data edition interface editing data structure;
Step 13: call the data coding/decoding module of described general codec, by the binary code flow data of described structural information data, member's field data construction data structure; And
Step 14:, from described binary code flow data, obtain member's field data of data structure and decode according to the structural information data of described user-defined format.
5. data decoding method according to claim 4 is characterized in that, the mode that described extraction is adopted changes with the definition mode of described data structure.
6. data decoding method according to claim 4 is characterized in that, described user-defined format adopts the expandable mark language XML form.
7. data decoding method according to claim 6 is characterized in that, is described single member's field data of described data structure by a plurality of elements of XML.
8. data decoding method according to claim 4 is characterized in that, described member's field data comprises: value, code encoding/decoding mode and the relativity shift information in described data structure.
9. data decoding method according to claim 8 is characterized in that, coding or decoding functions in one group of coding/decoding function in the XML element value of described code encoding/decoding mode and the described general codec are corresponding.
10. data decoding method according to claim 6 is characterized in that, the operation that is used for described member's field data comprises:
Obtain structural information data, and return with the XML form;
Value by member's field of data structure in the name modifications XML format item of data structure and member's field; And
Value by member's field of data structure in the name acquiring XML format item of data structure and member's field.
11. data decoding method according to claim 6 is characterized in that, also comprises the cataloged procedure of single member's field of data structure, this process comprises again:
Step 81: from the XML format item of general codec, obtain member's field data of data structure, comprise coded system, value and offset information; And
Step 82: according to the coded system and the value information of member's field of described data structure, call coded system corresponding codes function, generate the binary code stream of member's field of described data structure.
12. data decoding method according to claim 6 is characterized in that, also comprises the decode procedure of single member's field of data structure, this process comprises again:
Step 91: the decoding process of reading of data structure member field, length and relativity shift information from the XML format item;
Step 92:, obtain the code stream of member's field from the relativity shift of structure code stream according to relativity shift and length information; And
Step 93: the decoding process according to member's field of data structure calls corresponding decoding functions, and the code stream of member's field of data structure is decoded.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101488085A (en) * | 2008-01-17 | 2009-07-22 | 中兴通讯股份有限公司 | Software interface test method and apparatus |
| CN101459492B (en) * | 2008-12-30 | 2011-03-30 | 国家电网公司 | Data transmission method and system, data sending terminal |
| CN102571541A (en) * | 2010-12-24 | 2012-07-11 | 中兴通讯股份有限公司 | Message encoding-decoding method and device |
| CN102270223B (en) * | 2011-06-22 | 2017-03-29 | 中兴通讯股份有限公司 | The generation method in source codec storehouse, device and source codec method, device |
| CN102314371B (en) * | 2011-09-07 | 2017-04-12 | 中兴通讯股份有限公司 | Coding method, decoding method and coding/decoding device based on extensible markup language (XML) |
| CN102629951B (en) * | 2012-02-22 | 2014-10-29 | 大唐移动通信设备有限公司 | Decoding method and apparatus thereof |
| CN107168864A (en) * | 2016-03-08 | 2017-09-15 | 上海大唐移动通信设备有限公司 | Code stream generation method and device |
| CN108076017B (en) * | 2016-11-16 | 2021-09-17 | 腾讯科技（深圳）有限公司 | Protocol analysis method and device for data packet |
| CN112188211A (en) * | 2020-08-21 | 2021-01-05 | 北京新媒传信科技有限公司 | Transcoding implementation method and device |
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| WO2003005213A1 (en) * | 2001-07-02 | 2003-01-16 | Bea Systems, Inc. | Programming language extensions for processing data representation language objects and related applications |
| CN1466058A (en) * | 2002-06-24 | 2004-01-07 | 华为技术有限公司 | Method for readlizing universal test report |
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| WO2003005213A1 (en) * | 2001-07-02 | 2003-01-16 | Bea Systems, Inc. | Programming language extensions for processing data representation language objects and related applications |
| CN1376959A (en) * | 2002-04-28 | 2002-10-30 | 上海市广播科学研究所 | PCMCIA MPEG code stream analyzing method and equipment |
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