CN102231117A - Software installment method and system for embedded platform - Google Patents
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Abstract
The invention provides a software installment method and system for an embedded platform. The method comprises the following steps: decompressing an original android package (apk) installation package to obtain multiple directories and files; packing the directories and files into an uncompressed file of a zip format; and using an algorithm with a compression ratio higher than that of a DEFLATE algorithm, such as a Lempel-Ziv-Markov chain-Algorithm (Lzma) algorithm or Lzma 2 algorithm, to compress the whole file to reduce the size of the installation package. An algorithm decompression library is stored in a lib directory of a new apk installation package; and compared with java codes in the prior art, the algorithm decompression library has faster decompression. According to the invention, under the condition of an online installation mode, the bandwidth of a server can be saved, the waiting time for download is shortened, and user experience is improved.
Description
Technical field
The present invention relates to the application of embedded platform, relate in particular to a kind of method and system in the embedded platform install software.
Background technology
APK is the abbreviation of Android Package, i.e. the Android installation kit.In the prior art, usually adopt the compress mode of zip, each each file that will be installed in the installation procedure bag of software of Android platform is carried out the zip compression respectively, be packaged as a file then, generate the installation kit of suffix apk by name, wherein comprised the binary code, resource, configuration file of application software etc., thus, after an APK file decompresses, generally include:
The assets catalogue, the file in this catalogue can not be compiled into binary mode;
The lib catalogue is deposited dynamic library file;
The res catalogue is deposited resource file;
Manifest.xml is the program global configuration file, and each application software all must define and comprise, and it has described the information such as name, version, authority of application software;
Classes.dex is the java bytecode literary composition that java source code compiling back generates.
User's download apk file in the Android system after, carry out this apk and get final product install software.
The Zip file layout is a kind of data compression and archive format.Zip file comprises one or more being compressed or compressed file not, and Zip adopts the mode of compressed file respectively, and permission needn't be read other data and be retrieved independently file, and what the Zip compression was the most frequently used is the DEFLATE algorithm.
The compression method of the android apk of prior art, each file in the bag is carried out the zip compression respectively, cause compression ratio not high, the length of installation kit is still bigger, download service provider and final user's bandwidth expense is all than higher, and is also slow in the time of the user's download installation kit.
Lzma, (abbreviation of Lempel-Ziv-Markov chain-Algorithm), it is the compression algorithm after improvement of a Deflate and LZ77 algorithm and the optimization, it uses the dictionary encoding mechanism that is similar to LZ77, press down shrinkage than bzip2 height in general situation, the big I of the variable dictionary that is used to compress reaches 4GB, can offer the high compression of user compression speed faster when, and it is fit to built-in application program integrated very much.
Summary of the invention
The object of the present invention is to provide a kind of method and system, use the Lzma algorithm, reduce size, save the bandwidth of server, shorten and download the stand-by period, promote user's experience at embedded platform install software bag in the embedded platform install software.
For addressing the above problem, the invention provides a kind of method in the embedded platform install software, comprise compression step and decompress(ion) step, wherein,
Described compression step comprises:
With original apk installation kit decompress(ion) is a catalogue;
Described catalogue is packaged as the file of zip form;
The algorithm that is higher than DEFLATE according to a compressibility compresses the file of described zip form, obtains the compression algorithm file;
The algorithm compiler algorithm that is higher than DEFLATE according to described compressibility is separated and is overstocked, and forms described algorithm and separate the decompression function that overstocks;
Described compression algorithm file and algorithm separated to overstock be synthesized to new apk installation kit;
Described decompress(ion) step comprises:
Carry out described new apk installation kit;
Loading described algorithm separates and overstocks and call described algorithm and separate the decompression function that overstocks;
The described compression algorithm file of algorithm decompress(ion) that is higher than DEFLATE according to described compressibility is the apk file;
Described apk file is installed.
Further, described embedded platform is the Android platform.
Further, to be higher than the algorithm of DEFLATE be Lzma algorithm or Lzma2 algorithm to described compressibility.
Further, in the described compression step, described catalogue comprises assets catalogue, lib catalogue, res catalogue, Manifest.xml file and classes.dex file.
Further, in the described compression step, described algorithm is separated to overstock and is stored under the lib catalogue of described new apk installation kit.
Further, in the described compression step, compile described algorithm by NDK and separate and overstock.
Further, in the described decompress(ion) step, separate the decompression function that overstocks by the described algorithm of JNI interface interchange.
Accordingly, the present invention also provides a kind of system in the embedded platform install software, comprises compression module and decompression module, wherein,
Described compression module comprises:
Apk decompress(ion) unit, being used for original apk installation kit decompress(ion) is a catalogue;
The zip packaged unit is used for described catalogue is packaged as the file of zip form;
The compression algorithm unit, the algorithm that is used for being higher than DEFLATE according to a compressibility compresses the file of described zip form, obtains the compression algorithm file;
The algorithm compilation unit is used for separating according to the algorithm compiler algorithm that described compressibility is higher than DEFLATE and overstocks, and forms described algorithm and separate the decompression function that overstocks;
The apk synthesis unit is used for described compression algorithm file and algorithm separated to overstock being synthesized to new apk installation kit;
Described decompression module comprises:
The apk performance element is used to carry out described new apk installation kit;
The algorithm loading unit is used to load described algorithm and separates and overstock and call described algorithm and separate the decompression function that overstocks;
Algorithm decompress(ion) unit, the described compression algorithm file of algorithm decompress(ion) that is used for being higher than according to described compressibility DEFLATE is the apk file;
The apk installation unit is installed described apk file.
Further, described apk synthesis unit is preserved described algorithm and is separated and overstock under the lib catalogue of described new apk installation kit.
Further, described algorithm compilation unit compiles described algorithm by NDK and separates and overstock.
Further, described algorithm loading unit is separated the decompression function that overstocks by the described algorithm of JNI interface interchange.
Compared with prior art, method and system in the embedded platform install software provided by the invention, each catalogue and the file that obtain behind the original apk installation kit decompress(ion), be packaged as the not compressed file of a zip form, adopt a compressibility to be higher than the algorithm of DEFLATE then, as Lzma algorithm or Lzma2 algorithm, this document is carried out reduced overall, reduced the size of installation kit, algorithm decompress(ion) stock is placed on new apk installation kit lib catalogue the inside, it is fast that algorithm is separated the speed that the local code execution meeting of overstocking carries out decompress(ion) than java code under the prior art during decompress(ion), under the online mounting means, can save the bandwidth of server, shorten and download the stand-by period, promote user's experience.
Description of drawings
Fig. 1 is the compression step process flow diagram of the method in the embedded platform install software of the present invention;
Fig. 2 is the file header structural drawing of file of the zip form of specific embodiments of the invention;
Fig. 3 is the decompress(ion) flow chart of steps of the method in the embedded platform install software of the present invention;
Fig. 4 is the structural representation of the system in the embedded platform install software of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the method and system in the embedded platform install software that the present invention proposes is described in further detail.
The present invention proposes a kind of method in the embedded platform install software, and this method comprises compression step and decompress(ion) step.Described embedded platform can be present Android platform than main flow.
As shown in Figure 1, described compression step comprises:
Step S1 is a catalogue with original apk installation kit decompress(ion), and described catalogue comprises the assets catalogue, lib catalogue, res catalogue, Manifest.xml file and classes.dex file.
Step S2 is packaged as the file of zip form with described catalogue, and the file of described zip form is unpressed, and its file header structure comprises each composition as shown in Figure 2.
Step S3, the algorithm that is higher than DEFLATE according to a compressibility compresses the file of described zip form, obtains the compression algorithm file.
In this step, the algorithm that described compressibility is higher than DEFLATE can be Lzma algorithm or Lzma2 algorithm, and the file of described zip form is compressed, and obtains the Lzma compressed file.
Step S4, the algorithm compiler algorithm that is higher than DEFLATE according to described compressibility is separated and is overstocked, and forms described algorithm and separate the decompression function that overstocks.
In this step, can come to compile described algorithm by NDK and separate and overstock according to described algorithm.NDK complete (Native Development Kit) provide a series of instrument, helps the developer to develop the dynamic base of C (or C++) fast, simultaneously, and integrated cross-compiler, and provide corresponding mk file to isolate differences such as CPU, platform, ABI.In this step, compiler algorithm is separated and is overstocked and can carry out in advance before software is installed, promptly step S4 can with any one reversing of position among the step S1 to S3.
Step S5 separates described compression algorithm file and algorithm to overstock and is synthesized to new apk installation kit.
In this step, described algorithm is separated to overstock and is stored under the lib catalogue of described new apk installation kit.
As shown in Figure 3, described decompress(ion) step comprises:
Step S6 carries out described new apk installation kit;
Step S7 loads described algorithm and separates and overstock and call described algorithm and separate the decompression function that overstocks;
In this step, can separate the decompression function that overstocks by the described algorithm of JNI interface interchange, JNI is the abbreviation of Java Native Interface, Chinese is for calling JAVA this locality, the code that it allows Java code and other language to write carries out alternately, JNI is for local compiled language at the beginning, and especially C and C++ design;
Step S8, the described compression algorithm file of algorithm decompress(ion) that is higher than DEFLATE according to described compressibility is the apk file;
Step S9 installs described apk file, is about to software and is installed in the described embedded platform.
Need to prove that the position difference that described compression algorithm file is deposited is for providing two kinds of different modes: add shell mounting means and online mounting means in the embedded platform install software in the S5 step.In step S5, when described compression algorithm file is stored in assets catalogue or other catalogues following times of described new apk installation kit, produced and added under the shell mounting means, accordingly, among the described step S8, the compression algorithm file that is higher than according to described compressibility in the described assets catalogue of algorithm decompress(ion) of DEFLATE is the apk file; And when described compression algorithm file is stored in the webserver, produced online mounting means, and corresponding, among the described step S9, to download described compression algorithm file from the webserver earlier, be the apk file according to described algorithm decompress(ion) again.
Accordingly, the invention provides a kind of system in the embedded platform install software, this system comprises compression module 10 and decompression module 20.
Please refer to Fig. 4, described compression module 10 comprises:
Apk decompress(ion) unit 101, being used for original apk installation kit decompress(ion) is a catalogue;
Zip packaged unit 102 is used for described catalogue is packaged as the file of zip form;
Please continue with reference to figure 4, described decompression module 20 comprises:
Algorithm decompress(ion) unit 203, the described compression algorithm file of algorithm decompress(ion) that is used for being higher than according to described compressibility DEFLATE is the apk file, add under the shell mounting means described, the compression algorithm file that described algorithm decompress(ion) unit 203 is higher than according to described compressibility in the described assets catalogue of algorithm decompress(ion) of DEFLATE is the apk file; Under described online mounting means, described compression algorithm file is downloaded from the webserver in described algorithm decompress(ion) unit 203, and is the apk file according to the algorithm decompress(ion) that described compressibility is higher than DEFLATE;
In sum, method and system in the embedded platform install software provided by the invention, each catalogue and the file that obtain behind the original apk installation kit decompress(ion), be packaged as the not compressed file of a zip form, adopt a compressibility to be higher than the algorithm of DEFLATE then, as Lzma algorithm or Lzma2 algorithm, this document is carried out reduced overall, reduced the size of installation kit, algorithm decompress(ion) stock is placed on new apk installation kit lib catalogue the inside, it is fast that algorithm is separated the speed that the local code execution meeting of overstocking carries out decompress(ion) than java code under the prior art during decompress(ion), under the online mounting means, can save the bandwidth of server, shorten and download the stand-by period, promote user's experience.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (12)
1. the method in the embedded platform install software is characterized in that, comprises compression step and decompress(ion) step, wherein,
Described compression step comprises:
With original apk installation kit decompress(ion) is a catalogue;
Described catalogue is packaged as the file of zip form;
The algorithm that is higher than DEFLATE according to a compressibility compresses the file of described zip form, obtains the compression algorithm file;
The algorithm compiler algorithm that is higher than DEFLATE according to described compressibility is separated and is overstocked, and forms described algorithm and separate the decompression function that overstocks;
Described compression algorithm file and algorithm separated to overstock be synthesized to new apk installation kit;
Described decompress(ion) step comprises:
Carry out described new apk installation kit;
Loading described algorithm separates and overstocks and call described algorithm and separate the decompression function that overstocks;
The described compression algorithm file of algorithm decompress(ion) that is higher than DEFLATE according to described compressibility is the apk file;
Described apk file is installed.
2. the method in the embedded platform install software as claimed in claim 1 is characterized in that, described embedded platform is the Android platform, and the algorithm that described compressibility is higher than DEFLATE is Lzma algorithm or Lzma2 algorithm.
3. the method in the embedded platform install software as claimed in claim 1 is characterized in that, in the described compression step, described catalogue comprises assets catalogue, lib catalogue, res catalogue, Manifest.xml file and classes.dex file.
4. the method in the embedded platform install software as claimed in claim 3 is characterized in that, in the described compression step, described algorithm is separated to overstock and is stored under the lib catalogue of described new apk installation kit.
5. as each described method in the claim 1 to 4, it is characterized in that, in the described compression step, compile described algorithm by NDK and separate and overstock in the embedded platform install software.
6. as each described method in the claim 1 to 4, it is characterized in that, in the described decompress(ion) step, separate the decompression function that overstocks by the described algorithm of JNI interface interchange in the embedded platform install software.
7. the system in the embedded platform install software is characterized in that, comprises compression module and decompression module, wherein,
Described compression module comprises:
Apk decompress(ion) unit, being used for original apk installation kit decompress(ion) is a catalogue;
The zip packaged unit is used for described catalogue is packaged as the file of zip form;
The compression algorithm unit, the algorithm that is used for being higher than DEFLATE according to a compressibility compresses the file of described zip form, obtains the compression algorithm file;
The algorithm compilation unit is used for separating according to the algorithm compiler algorithm that described compressibility is higher than DEFLATE and overstocks, and forms described algorithm and separate the decompression function that overstocks;
The apk synthesis unit is used for that described compressibility is higher than the compression algorithm file of DEFLATE and algorithm and separates to overstock and be synthesized to new apk installation kit;
Described decompression module comprises:
The apk performance element is used to carry out described new apk installation kit;
The algorithm loading unit is used to load described algorithm and separates and overstock and call described algorithm and separate the decompression function that overstocks;
Algorithm decompress(ion) unit, the described compression algorithm file of algorithm decompress(ion) that is used for being higher than according to described compressibility DEFLATE is the apk file;
The apk installation unit is installed described apk file.
As described in the claim 7 in the system of embedded platform install software, it is characterized in that described embedded platform is the Android platform, the algorithm that a described compressibility is higher than DEFLATE is Lzma algorithm or Lzma2 algorithm.
As described in the claim 7 in the system of embedded platform install software, it is characterized in that the described catalogue that described apk decompress(ion) unit decompress(ion) obtains comprises assets catalogue, lib catalogue, res catalogue, Manifest.xml file and classes.dex file.
As described in the claim 9 in the system of embedded platform install software, it is characterized in that described apk synthesis unit is preserved described algorithm and separated and overstock under the lib catalogue of described new apk installation kit.
11., it is characterized in that described algorithm compilation unit compiles described algorithm by NDK and separates and overstock as each described method in the claim 7 to 10 in the embedded platform install software.
12., it is characterized in that described algorithm loading unit is separated the decompression function that overstocks by the described algorithm of JNI interface interchange as each described method in the claim 7 to 10 in the embedded platform install software.
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