WO2005081408A1 - Methode de codage binaire concue pour des donnees structurees dont le code est automatiquement genere - Google Patents

Methode de codage binaire concue pour des donnees structurees dont le code est automatiquement genere Download PDF

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Publication number
WO2005081408A1
WO2005081408A1 PCT/CN2004/000122 CN2004000122W WO2005081408A1 WO 2005081408 A1 WO2005081408 A1 WO 2005081408A1 CN 2004000122 W CN2004000122 W CN 2004000122W WO 2005081408 A1 WO2005081408 A1 WO 2005081408A1
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WO
WIPO (PCT)
Prior art keywords
bxml
structured data
encoding
tag
code generation
Prior art date
Application number
PCT/CN2004/000122
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English (en)
Chinese (zh)
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WO2005081408A9 (fr
Inventor
Wenyuan Li
Original Assignee
Utstarcom (China) Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Utstarcom (China) Co., Ltd. filed Critical Utstarcom (China) Co., Ltd.
Priority to CN2004800236517A priority Critical patent/CN1836374B/zh
Priority to PCT/CN2004/000122 priority patent/WO2005081408A1/fr
Publication of WO2005081408A1 publication Critical patent/WO2005081408A1/fr
Publication of WO2005081408A9 publication Critical patent/WO2005081408A9/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F8/00—Arrangements for software engineering
    • G06F8/40—Transformation of program code
    • G06F8/41—Compilation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/85—Assembly of content; Generation of multimedia applications
    • H04N21/854—Content authoring
    • H04N21/8543—Content authoring using a description language, e.g. Multimedia and Hypermedia information coding Expert Group [MHEG], eXtensible Markup Language [XML]

Definitions

  • the present invention relates to a simple and easy structured data encoding technology, in particular to a binary encoding method of structured data suitable for automatic code generation, and specifically, includes description, encoding and automatic code mapping of structured data. . Background technique
  • W3C released the XML binary encoding format WBXML (WAP Binary XML). Its core idea is to convert XML tags and attribute types. , Attribute values, and string constants are mapped into single-byte encodings, and encoding conflicts are avoided by using a coding space (codepage).
  • WBXML was originally designed to improve the coding efficiency of WAP's application layer protocol WML (Wireless Markup Language), but because it is simple, efficient, and has characteristics independent of specific applications, it is also used in many other situations, such as Wireless Village (http://www.wireless-village.org), SyncML (http://ww.syncml.org) etc. have different characteristics.
  • WBXML is used as a communication protocol. Encoding format. All the passed message structures are predefined. Languages such as WML are used to describe the structure of WAP pages. The message structure is unpredictable. Known. Although WBXML has a much higher coding efficiency compared to XML, its programming model has not changed. It still needs to be documented using Document Object Model (DOM) or Simple API for XML (SAX API). This programming model may be suitable for pages. Browser, but it is not necessarily suitable for applications where WBXML is extended (such as Wireless Village), because it is not a direct mapping of computer programming language-oriented data structures, and developers need to write a lot of code to manipulate data related to application information .
  • DOM Document Object Model
  • SAX API Simple API for XML
  • the technical problem to be solved by the present invention is to propose a binary encoding method of structured data suitable for automatic code generation. It is independent of platform, language and transmission of various application data exchanges, such as network communication protocols, data synchronization between intelligent devices, structured data storage, etc.
  • the binary encoding method for structured data suitable for automatic code generation in the present invention refers to the described encoding rule as binary extensible markup language BXML (Binary XML), and includes the following steps:
  • Step 1 define a BXML encoding format
  • Step 2 According to specific application requirements, construct a structured data description file suitable for BXML encoding
  • Step 3 Use a BXML compiler to read the structured data description file, and the BXML compiler generates the source code of a specific computer language according to the command.
  • Step 4 Combine with specific application logic and transmission methods to achieve complete application-layer data exchange.
  • the method of the present invention provides a code-defined rule and a set of code generation processes and rules so that a compiler developed by a developer according to these rules can automatically generate codecs.
  • the invention has the characteristics of wide application area, efficient coding, suitable for automatic code generation, simple and easy to implement. Overview of the drawings
  • FIG. 1 is a schematic flowchart of a method according to the present invention
  • FIG. 2 is another specific schematic diagram of the method according to the present invention. DETAILED DESCRIPTION OF THE INVENTION
  • the present invention refers to the described coding rules as "BXML (Binary XML)" to show the difference from WBXML.
  • FIG. 1 A schematic flowchart of the method according to the present invention is shown in FIG. 1.
  • the basic idea of the present invention is to first establish a BXML encoding format, which includes a description of a version number, a message length, a character set, an indefinite structure, and the like; construct a structured data description file according to the BXML encoding format; and then use a BXML compiler to read all The structured data description file is described.
  • the BXML compiler generates the source code of a specific computer language according to the command, and combines it with specific application logic and transmission methods to implement the data structure mapping from the application data structure to the computer language.
  • the encoding map of the label is shown in FIG. 1.
  • the BXML encoding format proposed by the present invention is as follows:
  • arrayltem ARRAY— ITEM (integer
  • the message length refers to the variable number of bytes in the subsequent BXML encoding, excluding the version number and the number of bytes occupied by the message length itself. It is encoded as a double-byte integer (in network order). The purpose of this field is to facilitate the use of BXML encoding in connection-oriented transmissions (such as TCP) without affecting the decoder.
  • Character set charset mb_u_int32
  • the character set defines the encoding character set used for all basic types of strings in subsequent BXML encodings.
  • the field itself is encoded as a multibyte integer whose integer value is the MIB number assigned by IANA to the character set. If the character set is zero, it means that the default character set has been agreed in advance by the codec.
  • Indefinite structure ANY [SWITCH JPAGH codepage] TAG [struct]
  • the ANY part is a tagged structure, and the decoder can know the type of the structure by the tag value.
  • the TAG value is automatically assigned by the BXML compiler.
  • the BXML compiler always assigns TAG values incrementally starting from 0X05 in the order of the structure definitions in a BXML structure description file.
  • the TAG value of the structure is only valid in the corresponding codepage space.
  • the default codepage value is zero. If the codepage is not zero, the SWITCH— PAGH codepage must appear, and the codepage value specified by it only applies to the following struct. This is different from WBXML. In WBXML, the codepage always takes effect until the next SWITCH—PAGH codepage appears.
  • the consideration of the present invention is that the structure contained in one structure may be located in another codepage space. If the coding rules of WBXML are followed, SWITCH-PAGH may appear repeatedly, and the invention considers that the decoder has predicted the type of any structure member Therefore, codepage and structure TAG are not needed for members of the structure at all, so we define SWITCH-PAGH to take effect only once. This also avoids the need for the decoder to remember the codepage state.
  • TAG is encoded as a single byte, which has the following structure:
  • a TAG is always valid in the space it belongs to. There are three types of TAG spaces, as shown in the following table:
  • Predefined tags are always globally valid and include:
  • the 7th bit of the TAG must be cleared, otherwise it must be set to 1 and ended with an END after the member encoding is finished.
  • Internal tags are used to identify whether a member appears. Its value is also incremented from 0X05.
  • a structure consists of a number of content codes and an END tag.
  • Each content represents a member of a structure.
  • the presence or absence of a structure member is determined by the application logic.
  • the appearance of a member can be with or without a value.
  • the logic decides.
  • Content INTERNAL— TAG [integer
  • a string is encoded in the encoding specified by the character set and ends with a single-byte zero.
  • the present invention does not accept character sets whose end tag is not a single-byte zero value in the C language, such as UTF-16.
  • UTF-16 a single-byte zero value in the C language
  • UTF-8 any special character set
  • the encoding rules for arbitrary binary data strings are the same as opaque in WBXML, which consists of a length indicator and several bytes of data.
  • the length indicator refers to the number of bytes of the binary data string, excluding the number of bytes of itself, and it is encoded into a multi-byte integer.
  • Union content
  • a union consists of a single content encoding, which can be valued or unvalued.
  • Enum enum integer
  • Enumerations are encoded as multi-byte integers that represent the defined enumeration values.
  • Array * arrayltem END
  • An array consists of the encoding of several array elements and an END tag.
  • Array element arrayltem ARRAY ITEM (integer
  • An array element consists of an ARRAYJ EM tag and the encoding of the element value.
  • the array element type is predictable to the decoder.
  • the characteristics of WBXML inherited by the BXML encoding format of the present invention mainly include: inheriting the characteristics of elements in WBXML, including element nesting, default, single element without content, etc.
  • the element tag (Element tag) is still single-byte encoded, and the encoding space (codepage) is used to avoid encoding conflicts;
  • Basic data type encoding rules are the same as WBXML, such as multibyte integers (mb-int), Inline string (opaque) and opaque data (opaque), etc .; BXML-based development process and automatic code generation
  • the development process is shown in Figure 2.
  • the present invention explains the principle of automatic code generation for the most commonly used computer languages C ++ and JAVA.
  • BXML compiler generates the source code of a specific computer language according to commands, such as C ++, JAVA. This automatically generated code contains the following main features:
  • Structured data types are directly expressed with the same class name and member name. Developers can use these codes to directly set or extract the content of structured data without indirect access like DOM or SAX API.
  • the code contains codec functions that can be used to generate or parse BXML encoded data.
  • the code can include self-printing functions for easy debugging.
  • the structured data description file is used to describe the structure of the structured data determined in advance. Its status is similar to that of XML DTD files or Schema files, but unlike XML DTD or Schema files, its purpose is not to perform BXML encoding Verification is used to instruct the compiler to automatically generate program source code and to tell the compiler what codec code should be generated.
  • BXML encoding Verification is used to instruct the compiler to automatically generate program source code and to tell the compiler what codec code should be generated.
  • Context any data exchange always takes place in a certain context (Context), such as a specific protocol interface and so on.
  • Context such as a specific protocol interface and so on.
  • a structured data description is always directed to such a context.
  • a context description can consist of one or more BXML structure description files.
  • a run of the BXML compiler is always directed to one context, and it needs to read all the description files of the context at the same time.
  • Each BXML structure description file must use the "page" keyword at the beginning of the file to specify the codepage space of the file, which is valid for all structures described in the file. In one context, the codepage must be unique.
  • Each BXML structure description file should specify the JAVA package name or C ++ namespace required after generating the program source code after the page keyword. They are valid for all descriptions in the file. For different description files in a context, you can specify the same or different JAVA package name or C ++ namespace.
  • Opaque binary byte sequence the keyword is binary
  • the present invention describes structured data in a manner similar to the C language header file.
  • the following example illustrates the format of the description file. Where the underlined part Are keywords, all keywords are displayed.
  • mapping method from a BXML structure description file to a certain computer programming language should not be unique.
  • the present invention first describes general rules; then, it briefly describes typical mappings to C ++ and JAVA languages.
  • Context Any data exchange always takes place in a certain context (Context), such as a specific protocol interface and so on.
  • Context such as a specific protocol interface and so on.
  • a structured data description is always directed to such a context.
  • a context description can consist of one or more BXML structure description files.
  • a run of the BXML compiler is always directed to one context, and it needs to read all the description files of the context at the same time.
  • all BXML configuration files for a context should usually be placed in the same root directory.
  • An application can have different contexts at the same time. For example, it may have multiple different types of communication interfaces at the same time, and exchange data with different entities. In this way, you need to use the BXML compiler to compile each context separately. Although the tag values of different contexts will conflict, they should be used in different communication interfaces (addresses), and there is no problem with such duplicate tag values. However, there may be situations where data type names conflict in different contexts. This situation should be resolved using different JAVA package names or C ++ namespaces.
  • the BXML compiler starts from 0X05 for each description file: Assigns a structure TAG to each structure in turn. If there are too many structures, they can be distributed to different codepages.
  • the BXML compiler assigns internal tags to each member of the structure or union in turn, starting from 0X05.
  • the maximum number of internal tags of a structure or union is:
  • SessionType (const SessionType &other);
  • SessionType & operators const SessionType &other); void wr / te (BXMLBuffer & buffer, BXMLWriter &w);
  • a _value integer member variable represents the current enumeration value
  • the write member function is used to encode the enumeration object itself
  • the toString member function is used to output the printable string of the object itself.
  • the string should be represented in a human-readable manner.
  • the enumeration object in the above example may output the string "inband".
  • the parseStatic static member function is used to decode an enum object.
  • SessionDescriptor * get a desc ();
  • a structure is mapped to a C ++ class with the same name, which inherits the ANY class;
  • a member pointer variable with the same name prefixed with " ⁇ " is used to represent the value of the member. If the value pointer of the member identified as being present by the corresponding presence variable is empty, it means that the member has no value;
  • a xxx_presence variable is used to identify whether the corresponding member appears
  • set_xxx For each structure member, there should be thousands of overloaded set_xxx member functions to set the value of the members.
  • the set_XXX function should generally include the form of the takeover pointer and the form of the copy number.
  • the write member function is used to encode the object itself
  • the toString member function is used to output the printable string of the object itself.
  • the parseStatic static member function is used to decode a structure object.
  • IntegerList (const IntegerList &other);
  • IntegerList & operator (const IntegerList &other);
  • BinaryList & operator (const BinaryListfe: other); void clean ();
  • the write member function is used to encode the array 3 like itself
  • the toString member function is used to output the printable string of the object itself.
  • a string is mapped to the C ++ STL string type.
  • a binary byte sequence is mapped to C ++ 's STL vecotor ⁇ BYTE> type.
  • the indefinite structure is mapped to the ANY class in the BXML runtime, which is also the base class where all structures are mapped into C ++ classes.
  • the definition of the ANY class is summarized as follows: class ANY public: static ANY * parseANY (uBYTE id, BXMLBuffer & buffer, BXMLParser &p); virtual -ANY () ⁇ ;
  • BXMLWriter and BXMLParser, which are used to support encoding and decoding of top-level BXML data. Mapping to Java
  • An integer is mapped to JAVA's Integer type, which is available in the BXML runtime. •
  • the BXMLInt class is used to support encoding and decoding of it and the output of printable strings.
  • a string is mapped into the JAVA String type.
  • a binary byte sequence is mapped to JAVA's byte [] type.
  • the indefinite structure is mapped to the ANY class in the BXML runtime. It is also the base class for all structures mapped to JAVA classes.
  • the definition of the ANY class is summarized as follows: public abstract class ANY ⁇
  • BXMLWriter In addition, there are two important classes in the BXML runtime: BXMLWriter and
  • BXMLParser used to support encoding and decoding of top-level BXML data.
  • An application running example uses the BXML structure description file described in the previous example, and then uses the source code generated by the BXML compiler to develop an application that constructs structured data with the Message structure defined in the description file as the top-level structure. Then use the self-print function of this structure to output the data content, and use the encoding function to perform BXML encoding.
  • the total length of the data after LoginRes is encoded by the encoding function is 138 bytes, and its content is expressed in hexadecimal: ⁇ :
  • 04 key binary byte sequence has length 4
  • 02 binary byte sequence is 2 in length
  • 03 Binary byte sequence is 3 in length
  • Means codepage is 0
  • the internal tag is explained in a structure and represents a corresponding member of the structure.
  • the internal tag can carry the content of the tag according to the needs of the runtime. (I.e. member value), may also carry no content (i.e. no value appears), or may not appear (i.e. member is absent);
  • the content carried by the internal tag no longer needs any other tag tags, because the type is predicted, except when the member type is an indefinite structure (ANY);
  • the content carried by the internal label is directly encoded according to the corresponding member type.
  • integers are encoded as multi-byte integers.
  • WBXML which still uses string encoding
  • Attributes that specifically support WBXML are not considered, but attributes can be expressed by adding structure members
  • a binary encoding method of structured data suitable for automatic code generation is proposed.
  • the present invention is applicable to the exchange of various application data independent of the platform, language and transmission, such as network communication protocols, Data synchronization, structured data storage, etc.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Software Systems (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Security & Cryptography (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Devices For Executing Special Programs (AREA)

Abstract

L'invention concerne une méthode de codage binaire conçue pour des données structurées dont le code est automatiquement généré. Cette méthode est caractérisée en ce qu'elle comprend les étapes consistant à: définir un format de codage BXML; selon une exigence d'application spécifique, construire un document de description de données structurées conçu pour faire appel au codage BXML; utiliser un compilateur BXML pour lire le document de description de données structurées, selon l'instruction, le compilateur BXML générant un certain code de source de langage informatique spécifique, combiner avec une logique appliquée spécifique et un mode de transmission spécifique; effectuer l'échange de données de toute la couche d'application. La méthode de l'invention permet de fournir un type de règle de définition de codage et de concevoir un ensemble de procédés et de règles de génération de code. La méthode de l'invention permet à l'équipe de recherche d'utiliser le compilateur pour effectuer des recherches selon les règles de l'invention pour générer automatiquement un code de codage/décodage. L'invention présente des champs d'application variés, permet d'obtenir un codage efficace, s'adapte à une génération de code automatique, et est simple et facile à mettre en oeuvre.
PCT/CN2004/000122 2004-02-13 2004-02-13 Methode de codage binaire concue pour des donnees structurees dont le code est automatiquement genere WO2005081408A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2004800236517A CN1836374B (zh) 2004-02-13 2004-02-13 一种适合代码自动生成的结构化数据的二进制编码方法
PCT/CN2004/000122 WO2005081408A1 (fr) 2004-02-13 2004-02-13 Methode de codage binaire concue pour des donnees structurees dont le code est automatiquement genere

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PCT/CN2004/000122 WO2005081408A1 (fr) 2004-02-13 2004-02-13 Methode de codage binaire concue pour des donnees structurees dont le code est automatiquement genere

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111258629A (zh) * 2018-11-30 2020-06-09 武汉斗鱼网络科技有限公司 一种手机代码转码方法、存储介质、电子设备及系统
US11599708B2 (en) 2017-10-20 2023-03-07 Hewlett Packard Enterprise Development Lp Encoding of data formatted in human readable text according to schema into binary

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105955066A (zh) * 2016-05-30 2016-09-21 北京理工大学 一种仿真系统中通用的模型数据编码和解码方法
CN110162480B (zh) * 2019-05-31 2023-02-24 泛升云微电子(苏州)有限公司 一种结构化诊断对象的自动化解析方法

Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2002063775A2 (fr) * 2001-02-05 2002-08-15 Expway Procede et systeme de compression de descriptions structurees de documents
WO2003001811A1 (fr) * 2001-06-25 2003-01-03 Siemens Aktiengesellschaft Systeme permettant un codage/decodage ameliore de documents structures, se basant en particulier sur xml, et procedes et dispositifs permettant un codage/decodage ameliore de representations binaires de ces documents
US20030046317A1 (en) * 2001-04-19 2003-03-06 Istvan Cseri Method and system for providing an XML binary format

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2002063775A2 (fr) * 2001-02-05 2002-08-15 Expway Procede et systeme de compression de descriptions structurees de documents
US20030046317A1 (en) * 2001-04-19 2003-03-06 Istvan Cseri Method and system for providing an XML binary format
WO2003001811A1 (fr) * 2001-06-25 2003-01-03 Siemens Aktiengesellschaft Systeme permettant un codage/decodage ameliore de documents structures, se basant en particulier sur xml, et procedes et dispositifs permettant un codage/decodage ameliore de representations binaires de ces documents

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11599708B2 (en) 2017-10-20 2023-03-07 Hewlett Packard Enterprise Development Lp Encoding of data formatted in human readable text according to schema into binary
CN111258629A (zh) * 2018-11-30 2020-06-09 武汉斗鱼网络科技有限公司 一种手机代码转码方法、存储介质、电子设备及系统
CN111258629B (zh) * 2018-11-30 2023-08-11 苏州新看点信息技术有限公司 一种手机代码转码方法、存储介质、电子设备及系统

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CN1836374B (zh) 2010-10-13
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