CN102096704A - XML (extensible markup language) compression method and device - Google Patents
XML (extensible markup language) compression method and device Download PDFInfo
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Abstract
The invention discloses an XML compression method and device. The method comprises: defining a byte in a data dictionary corresponding to each element of an XML document; defining a byte in the data dictionary corresponding to each attribute of the XML document; using the defined bytes in the data dictionary to substitute for the corresponding elements and the attributes in the XML document one by one by a sender to achieve the compression of the XML document; transmitting the compressed XML document to a receiver; and using the elements and the attributes corresponding to the bytes defined in the data dictionary to substitute for the bytes defined in the received XML document by the receiver so as to decompress the XML document. The method can solve the problem that the XML document has large data quantity during data transmission.
Description
Technical field
The present invention relates to the compression method and the device of data service technical field, particularly a kind of XML.
Background technology
Extend markup language (XML, Extensible Markup Language) is a kind of simple, general data description language (DDL).Compare with html language, it has stronger descriptive power; (SGML, Standard Generalized MarkupLanguage) compares with standard generalized markup language, and it is more succinctly understandable.Based on above-mentioned advantage, in the various application of internet, XML is widely used.
XML also exists some shortcomings.When using as host-host protocol, XML needs more storage space and bigger delivery flow rate than corresponding binary protocol.If the employing binary protocol can be saved all labels, can reduce storage and delivery flow rate like this, but binary protocol all is not so good as XML on parsing, use and versatility.
Just produce the technology that XML is compressed thus, the compression method of present most of XML compresses whole XML document based on a kind of specific compression algorithm, have much relations in the effect of this compress mode and the XML document of transmission, if duplicate contents is more in the document, compression effectiveness is relatively good, otherwise then effect is relatively poor.Most of in addition compression algorithms are had relatively high expectations to the CPU arithmetic capability, and this is bottlenecks for mobile phone and some single-chip microcomputers.
In a word, the compress mode of existing XML can not well solve the bigger problem of XML data volume in data transmission procedure.
Summary of the invention
The invention provides the compression method of a kind of XML, this method can solve the big problem of XML data volume in data transmission procedure.
For achieving the above object, this method is achieved in that
The invention provides the compression method of a kind of XML, this method comprises:
For each element in the XML document, corresponding with it byte of definition in data dictionary; And for each attribute in the XML document, corresponding with it byte of definition in data dictionary;
Transmit leg uses the corresponding byte that defines in the described data dictionary to replace element and attribute in the XML document one by one, realizes the compression of XML document;
XML document after the compression is sent to the take over party;
The take over party replaces byte in the received XML document according to the element corresponding with respective byte that defines in the described data dictionary and attribute, realizes the decompress(ion) of XML document.
The present invention also provides the compression set of a kind of XML, and this device comprises first memory module, second memory module, compression module and decompression module, wherein:
First memory module is used to preserve data dictionary;
Second memory module is used to preserve data dictionary;
In the described data dictionary,, defined a corresponding with it byte, and, defined a corresponding with it byte for each attribute in the XML document for each element in the XML document;
Compression module, the corresponding byte that is used for defining in the data dictionary according to first memory module is replaced element and the attribute in the XML document one by one, and the XML document after the compression is sent to decompression module;
Decompression module is used to receive the XML document after the compression that compression module sends, and replaces byte in the received XML document according to the element corresponding with respective byte that defines in the data dictionary in second memory module and attribute.
From the above, this transmission of the present invention both sides use identical data dictionary, and the corresponding byte that defines in the transmit leg data dictionary is replaced element and the attribute in the XML document one by one, realize the compression of XML document; After the take over party receives, replace byte in the received XML document according to the element corresponding that defines in the described data dictionary and attribute with respective byte, realize the decompress(ion) of XML document, be exactly the standard XML document behind the decompress(ion), the invention solves the big problem of the data volume of XML document in the transmission course.
Description of drawings
Fig. 1 is the process flow diagram of a kind of XML compression method among the present invention;
Fig. 2 is the process synoptic diagram that among the present invention XML document is compressed;
Fig. 3 is a kind of XML compression set structural representation among the present invention.
Embodiment
Fig. 1 is the process flow diagram of a kind of XML compression method among the present invention.As described in Figure 1:
In order to make the purpose, technical solutions and advantages of the present invention clearer, describe the present invention below in conjunction with the drawings and specific embodiments.
In specific embodiments of the invention, provided an XML document, as described below:
<？xml?version＝″1.0″encoding＝″utf-8″？>
<bookstore>
<book?catalog＝″Programming″>
<title?lang＝″en″>C++Programming?Language</title>
<author>Bjarne?Stroustrup</author>
<year>1998</year>
<price>98.0</price>
</book>
<book?catalog＝″Networking″>
<title?lang＝″en″>TCP/IP?Illustrated</title>
<author>Richard?Stevens</author>
<year>1996</year>
<price>56.0</price>
</book>
</bookstore>
In above-mentioned XML document, for each element in the XML document, corresponding with it byte of definition is specially in data dictionary: define a list of elements, and as shown in table 1.
| Masurium | Element value |
| bookstore | 0x01 |
| book | 0x02 |
| title | 0x03 |
| author | 0x04 |
| year | 0x05 |
| price | 0x06 |
Table 1
Comprise 8 bits with the corresponding byte of this element, wherein, the 1st in high 3 is used to judge whether the form into XML, and the 2nd is used to judge whether be element, and the 3rd is used to judge whether be closure element, if then put 1, otherwise then puts 0; Remaining 5 are used to represent this element.Wherein element format is as shown in table 2.
Table 2
As element＜bookstore 〉, 8 bits of this element correspondence are 11000001, then element＜bookstore〉corresponding byte is 0xc1;
As closure element＜/bookstore, 8 bits of this closure element are 11100001, then＜/bookstore corresponding byte is 0xe1;
In above-mentioned XML document, for each attribute in the XML document, corresponding with it byte of definition is specially in data dictionary: define an attribute list, and as shown in table 3.
| Attribute-name | Property value |
| catalog | 0x01 |
| lang | 0x02 |
Table 3
Comprise 8 bits with the corresponding byte of this attribute, wherein, the 1st in high 2 is used to judge whether the form into XML, if then put 1, otherwise then puts 0; The 2nd is used to judge whether be attribute, if then put 0, otherwise then puts 1; Remaining 6 are used to represent this attribute; Wherein the value of attribute is represented with string format, and with the ending of specific character as string format.In an embodiment of the present invention, with the ending of 0x00 as the string format of the value of attribute, be used to distinguish each character string, wherein attribute format is as shown in table 4.
Table 4
As the attribute of attribute catalog by name, 8 bits of this attribute correspondence are 100000001, and then the byte of catalog correspondence is 0x81; The value of catalog attribute is en, carries out the utf-8 coding, and the character string that obtains is ended up with 0x00, and obtaining corresponding byte number is 656e00.
Text in the XML document is represented with the form of character string, is specially with the beginning and end of specific character as the string format of text: described text is carried out the utf-8 coding, and the character string that obtains is ended up with the 0x00 beginning and with 0x00.
In other embodiments of the invention, when once transmitting a plurality of XML document, then insert the byte of expression document length and the incident title corresponding in the XML document after compression with this XML document after, send to the take over party, be specially event table of definition, as shown in table 5.
| Event name | Element value |
| BookLists | 0x0001 |
| …… | …… |
Table 5
Data dictionary comprises the list of elements 1, attribute list 3, event table 5.
In an embodiment of the present invention, transmit leg uses the corresponding byte that defines in the described data dictionary to replace element and attribute in the XML document one by one, realize XML document compression process as shown in Figure 2, Fig. 2 is the synoptic diagram of the process among the present invention XML document compressed.
Step 201 is read in internal memory with the list of elements in the data dictionary, attribute list, event table and is carried out initialization.
Step 202 is applied for a byte arrays, reserves preceding 2 bytes as document length Data-Length in the byte arrays of application.
Step 203 is inserted event name in 2 bytes of corresponding incident title Event-Name.
Step 204 is read in XML document from the XML resolver, described XML document is compressed.In the process of compressing,, then in data dictionary, find the byte corresponding to insert in this byte arrays with this element if replacement is an element; If this element has attribute, then searching the byte corresponding with this attribute in data dictionary inserts in this byte arrays, and the value of attribute become character string by the utf-8 code conversion, and insert in this byte arrays as the ending of the string format of the value of attribute with 0x00; If a text then becomes character string with the text by the utf-8 code conversion, and insert in this byte arrays as the beginning and end of the string format of text with 0x00.Repeat above process, finish up to the document compression.Calculate total byte length at last, insert in the Data-Length field, compression process finishes.Then compression result is as shown in table 6.
Table 6
Can get described XML document according to table 6 and after overcompression, obtain 165 bytes: 00a50001c1c28150726f6772616d6d696e6700c382656e0000432b2b 2050726f6772616d6d696e67204c616e677561676500e3c400426a61 726e65205374726f75737472757000e4c5003139393800e5c6003938 2e3000e6e2c2814e6574776f726b696e6700c382656e00005443502f 495020496c6c757374726174656400e3c40052696368617264205374 6576656e7300e4c5003139393600e5c60035362e3000e6e2e1
XMLutf-8381：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
By above-mentioned example as can be seen, before the compression, XML document is 381 bytes, 165 bytes only after the compression, ratio of compression is: (165/381) * 100%=43.3%, and promptly the byte number after the compression is 43.3% of a former XML document byte number only, compression factor is up to 56.7%.The take over party can be easy to the byte after the compression is decoded by dictionary, and decoded XML document is on all four with former document, without any information dropout.
The present invention also provides a kind of XML compression set, and this device comprises first memory module 301, second memory module 304, compression module 302 and decompression module 303, wherein:
In the described data dictionary,, defined a corresponding with it byte, and, defined a corresponding with it byte for each attribute in the XML document for each element in the XML document;
In the data dictionary in described first memory module 301 and second memory module 304:
The described byte corresponding with each element comprises 8 bits, and wherein, the 1st in high 3 is used to judge whether the form into XML; The 2nd is used to judge whether be element; The 3rd is used to judge whether the element into finishing, and remaining 5 are used to represent this element;
The described byte corresponding with each attribute comprises 8 bits, and wherein, the 1st in high 2 is used to judge whether the form into XML; The 2nd is used to judge whether be attribute, and remaining 6 are used to represent this attribute; Wherein the value of attribute is represented with string format.
In the data dictionary in described first memory module 301 and second memory module 304:
With the ending of specific character as the string format of the value of attribute.
In said apparatus, compression module 302 is represented the text in the XML document with string format, with the beginning and end of specific character as the string format of text.
In said apparatus, described compression module 302, be further used for inserting in the XML document after compression the byte of expression document length and the incident title corresponding with this XML document after, send to decompression module 303 again.
In sum, XML document of the prior art shared data traffic in transmission course is very high.The technical scheme that the present invention proposes, adopt data dictionary earlier element and attribute in the XML document of needs transmission to be replaced, realize compression, XML document after transmit leg will compress is transferred to the take over party, after the take over party receives this XML document, according to data dictionary in the XML document that receives with element or anti-replacement of the corresponding byte of attribute, be exactly former XML document behind the decompress(ion).This method is not subjected to the content constraints in the compressed XML document, and the algorithm of compression and decompression is very simple, and is not high to the requirement of CPU yet, and this method can solve the big problem of XML data volume in data transmission procedure preferably.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. the compression method of an expandable mark language XML is characterized in that, this method comprises:
For each element in the XML document, corresponding with it byte of definition in data dictionary; And for each attribute in the XML document, corresponding with it byte of definition in data dictionary;
Transmit leg uses the corresponding byte that defines in the described data dictionary to replace element and attribute in the XML document one by one, realizes the compression of XML document;
XML document after the compression is sent to the take over party;
The take over party replaces byte in the received XML document according to the element corresponding with respective byte that defines in the described data dictionary and attribute, realizes the decompress(ion) of XML document.
2. method according to claim 1 is characterized in that, and is described for each element in the XML document, corresponding with it byte of definition in data dictionary; And for each attribute in the XML document, corresponding with it byte of definition comprises in data dictionary:
The described byte corresponding with each element comprises 8 bits, and wherein, the 1st in high 3 is used to judge whether the form into XML; The 2nd is used to judge whether be element; The 3rd is used to judge whether be closure element, and remaining 5 are used to represent this element;
The described byte corresponding with each attribute comprises 8 bits, and wherein, the 1st in high 2 is used to judge whether the form into XML; The 2nd is used to judge whether be attribute, and remaining 6 are used to represent this attribute; Wherein the value of attribute is represented with string format.
3. method according to claim 2 is characterized in that, the value of described attribute is represented to comprise with string format: with the ending of specific character as the string format of the value of attribute.
4. method according to claim 1 is characterized in that, realize that the compression of XML document further comprises: the text in the XML document is represented with string format, with the beginning and end of specific character as the string format of text.
5. method according to claim 1 is characterized in that, the XML document after described will the compression sends to the take over party and comprises:
After inserting the byte of expression document length and the incident title corresponding in the XML document after compression, send to the take over party with this XML document.
6. the compression set of an XML is characterized in that, this device comprises: first memory module, second memory module, compression module and decompression module, wherein:
First memory module is used to preserve data dictionary;
Second memory module is used to preserve data dictionary;
In the described data dictionary,, defined a corresponding with it byte, and, defined a corresponding with it byte for each attribute in the XML document for each element in the XML document;
Compression module, the corresponding byte that is used for defining in the data dictionary according to first memory module is replaced element and the attribute in the XML document one by one, and the XML document after the compression is sent to decompression module;
Decompression module is used to receive the XML document after the compression that compression module sends, and replaces byte in the received XML document according to the element corresponding with respective byte that defines in the data dictionary in second memory module and attribute.
7. device according to claim 6 is characterized in that, in the data dictionary in described first memory module and second memory module:
The described byte corresponding with each element comprises 8 bits, and wherein, the 1st in high 3 is used to judge whether the form into XML; The 2nd is used to judge whether be element; The 3rd is used to judge whether be closure element, and remaining 5 are used to represent this element;
The described byte corresponding with each attribute comprises 8 bits, and wherein, the 1st in high 2 is used to judge whether the form into XML; The 2nd is used to judge whether be attribute, and remaining 6 are used to represent this attribute; Wherein the value of attribute is represented with string format.
8. device according to claim 6 is characterized in that, in the data dictionary in described first memory module and second memory module:
With the ending of specific character as the string format of the value of attribute.
9. device according to claim 6 is characterized in that,
Described compression module is represented the text in the XML document with string format, with the beginning and end of specific character as the string format of text.
10. device according to claim 6 is characterized in that,
Described compression module, be further used for inserting in the XML document after compression the byte of expression document length and the incident title corresponding with this XML document after, send to decompression module again.
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| WO2017036348A1 (en) * | 2015-09-06 | 2017-03-09 | 阿里巴巴集团控股有限公司 | Method and device for compressing and decompressing extensible markup language document |
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| CN110806874A (en) * | 2018-08-03 | 2020-02-18 | 武汉斗鱼网络科技有限公司 | Analysis method, storage medium, electronic device and system for configuration file of live broadcast room |
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| CN110806874A (en) * | 2018-08-03 | 2020-02-18 | 武汉斗鱼网络科技有限公司 | Analysis method, storage medium, electronic device and system for configuration file of live broadcast room |
| CN110806874B (en) * | 2018-08-03 | 2023-08-18 | 西安创业天下网络科技有限公司 | Analysis method, storage medium, electronic equipment and system for live broadcast room configuration file |
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