CN104281504B - A kind of method and system of the application data backup of storage reduction based on MD5 codes - Google Patents
A kind of method and system of the application data backup of storage reduction based on MD5 codes Download PDFInfo
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Abstract
The invention discloses a kind of method of the application data backup of storage reduction based on MD5 codes, comprise the following steps：S1, application data backup storage, the step calculates the associated documents of application program by MD5 message digest algorithms the MD5 values of each file, then the version number together with application program, related All Files title and it is corresponding existing for directory path backup be stored on cloud server；S2, application data download recover, and for the step when user is when another intelligent mobile terminal is opened and the information registration that accesses to your account enters this application program, recovery is downloaded in the renewal and application data for carrying out application program.This method can accurately calculate difference between data file, when carrying out backup and reduction, can save the flow uploaded with downloading data file, service speed when lifting is backed up and recovered；When the version number of application program is inconsistent, a kind of reduction approach of application program to previous version can be provided.
Description
Technical field
The present invention relates to the technical field of intelligent mobile terminal program application, more particularly to a kind of application based on MD5 codes
The method and system of routine data backup and reduction.
Background technology
With the increasingly innovation of 21st century electronics technology product, intelligent mobile terminal is intelligent all the more, now such as
Modern intelligent mobile terminal may be employed the backup, renewal and recovery of program, but the backup of application data,
Renewal and recovery are not also much to see, when user uses some application time mistake in some intelligent mobile terminal equipment
When long, the setting of some of which data and some hobbies has often formd a kind of custom, when replacing has used one newly
Intelligent mobile terminal after, if carry out the setting and data more newly downloaded or other operations of terminal again, Yong Huhui
Feel very uncomfortable, there is also some loss of data important informations etc. the such situation that can not find, experience effect sometimes
Fruit is very bad.The method of the backup-and-restore of user is provided for herein, and employs a kind of application journey based on MD5 codes
The method of sequence backup and reduction, data file difference can be calculated exactly, save the flow uploaded with downloading data file,
And the confidence level of verification can be improved using MD5 code checks, improves the security of data backup and resume.
The content of the invention
The shortcomings that first of the present invention aims to overcome that prior art and deficiency, there is provided a kind of answering based on MD5 codes
With the method for routine data backup and reduction.Using this invention, user application data can be uploaded onto the server carry out it is standby
Part, and what is uploaded is variance data file, saves the data traffic for uploading and downloading, while this backup and recovery are bases
MD5 codes improve the validity of application data recovery, facilitate the application data of user as distinguishing rule
Synchronized in another intelligent mobile terminal equipment.
It is another object of the present invention to the shortcomings that overcoming prior art and insufficient, there is provided a kind of answering based on MD5 codes
With the system of routine data backup and reduction.
First purpose of the present invention is achieved through the following technical solutions：
A kind of method of the application data backup of storage reduction based on MD5 codes, applied to intelligent mobile terminal, including it is following
Step：
S1, application data backup storage, the backup of the application data are stored the correlation of application program
File calculates the MD5 values of each file by MD5 message digest algorithms, then the version number together with application program, related institute
Directory path backup is stored on cloud server existing for documentary title and correspondence；
S2, application data download recover, and the download of the application data recovers when user is at another
When intelligent mobile terminal is opened and the information registration that accesses to your account enters this application program, the renewal of application program is carried out and using journey
Ordinal number recovers according to download.
Further, also comprise the following steps：
S3, application data backup updating, the backup updating of the application data should using this for user
With in program process, situation that the file of application program can change, user's selection carries out application data backup of storage at any time
Renewal, the associated documents of application program are calculated to the MD5 values of each file by MD5 message digest algorithms, by backup updating
The MD5 values of each file and the MD5 values of each file of last backup storage are contrasted afterwards, and it is different to find out MD5 values
File, by catalogue existing for MD5 values corresponding to the title of the set of the different file of all of above MD5 values, file and correspondence
Path is recorded, and the version number of all these data and application program constitutes a mapping relations, and data are preserved
Beyond the clouds on server.
Further, the step S1 is specially：
S101, the installation directory for obtaining application program and data directory All Files information, by the application program
All Files in installation directory and data directory calculates the MD5 values of each file by MD5 message digest algorithms respectively；
S102, by the title of the set of the installation directory of the application program and the All Files of data directory, Ge Gewen
Directory path existing for MD5 values corresponding to part and correspondence is preserved as the first data storage bag, and first is deposited
The version number of storage packet and application program constitutes a mapping relations；
S103, the first data storage bag is saved on cloud server.
Further, the step S2 is specially：
S201, when user select carry out application program renewal and application data download recover when, contrast apply journey
Whether sequence version number is identical, if version number is different, first by application program update to the application version number backed up, if version
This number identical, then not more new application；
The installation directory for the application program that S202, acquisition will be updated and the All Files information of data directory, by institute
The All Files in the installation directory and data directory for the application program that will be updated is stated respectively by MD5 message digest algorithms
Calculate the MD5 values of each file；
S203, each file of application program for storing the MD5 values of each file in the step S202 with backup MD5
Value is contrasted, and finds out the different differential file of MD5 values；
S204, from cloud server download discrepancy data, differential file is decompressed according to the directory path of differential file
To corresponding path, the renewal of application data is completed.
Further, the first time backup storage carried out in the step S1 to application data is that application program has just been pacified
After complete either application program is installed using operation a period of time.
Further, described intelligent mobile terminal is set including mobile phone, notebook computer, tablet personal computer and palm online
It is standby.
Another object of the present invention is achieved through the following technical solutions：
A kind of system of the application data backup of storage reduction based on MD5 codes, applied to intelligent mobile terminal, including it is following
Device：
The backup storage device of application data, the backup storage device of the application data is by application program
Associated documents calculate the MD5 values of each file by MD5 message digest algorithms, then the version number together with application program, phase
Directory path backup existing for the title and correspondence of All Files is closed to be stored on cloud server；
The download recovery device of application data, the download recovery device of the application data is when user is in addition
When one intelligent mobile terminal is opened and the information registration that accesses to your account enters this application program, carry out the renewal of application program and answer
Downloaded and recovered with routine data.
Further, in addition to following devices：
The backup updating device of application data, the backup updating device of the application data use for user
During this application program, situation that the file of application program can change, user is standby using the application data
Part updating device selection carries out application data backup of storage renewal at any time, and the associated documents of application program are plucked by MD5 information
Want algorithm to calculate the MD5 values of each file, the MD5 values of each file after backup updating and last backup are stored each
The MD5 values of file are contrasted, and find out the different file of MD5 values, by the name of the set of the different file of all of above MD5 values
Claim, directory path existing for MD5 values corresponding to file and correspondence is recorded, the version of all these data and application program
This number constitutes a mapping relations, and saves the data on cloud server.
Further, the backup storage device of the application data includes：
First fileinfo MD5 value computing modules, the first fileinfo MD5 values computing module, which is used to obtain, applies journey
The installation directory of sequence and the All Files information of data directory, by the institute in the installation directory and data directory of the application program
There are the MD5 values that file calculates each file by MD5 message digest algorithms respectively；
First data acquisition and version mapping block, first data acquisition and version mapping block are used to described to answer
The MD5 values and correspondingly corresponding to the title of the set of the installation directory of program and the All Files of data directory, each file
Existing directory path preserves as the first data storage bag, and by the first data storage bag and the version of application program
This number constitutes a mapping relations；
First data upload preserving module, and first data upload preserving module and are used for the first data acquisition and version
The first data storage in mapping block, which is wrapped, to be passed on cloud server.
Further, the download recovery device of the application data includes：
Application version update module, the application version update module select to carry out application program as user
It is whether identical for contrasting application version number when renewal and application data download recovery, if version number is different, first
Application version number by application program update to backup, if version number is identical, not more new application；
Second fileinfo MD5 value computing modules, the second fileinfo MD5 values computing module is used for acquisition will be by
The installation directory of the application program of renewal and the All Files information of data directory, and by the application program that will be updated
Installation directory and data directory in All Files the MD5 values of each file are calculated by MD5 message digest algorithms respectively；
Differential file searches comparing module, and the differential file is searched comparing module and is used for second fileinfo
The MD5 values of each file and the MD5 values of each file of application program of backup storage are contrasted in MD5 value computing modules, are looked into
Find out the different differential file of MD5 values；
Application data download module, the application data download module are used to download difference from cloud server
Packet, differential file is unziped to by corresponding path according to the directory path of differential file, completes application data more
Newly.
Further, the first time carried out in the backup storage device of the application data to application data is standby
Part storage be application program just installed either application program using operation a period of time after.
The present invention is had the following advantages relative to prior art and effect：
1), can be exactly using the method for the application data backup of storage reduction disclosed in this invention based on MD5 codes
Difference between data file is calculated, when carrying out the backup and reduction of data, can save and upload and downloading data file
Flow, service speed when improving backup and recovering.
2) when the version number of intelligent mobile terminal is inconsistent, the application program number disclosed in this invention based on MD5 codes
A kind of reduction approach of application program to previous version can be provided according to the method for backup and reduction.
Brief description of the drawings
Fig. 1 is a kind of method flow diagram of the application data backup of storage reduction based on MD5 codes in the present embodiment one；
Fig. 2 is a kind of block diagram of system of the application data backup of storage reduction based on MD5 codes in the present embodiment two.
Embodiment
To make the objects, technical solutions and advantages of the present invention clearer, clear and definite, develop simultaneously embodiment pair referring to the drawings
The present invention is further described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and do not have to
It is of the invention in limiting.
Embodiment one
Message Digest Algorithm MD5 (the entitled Message Digest Algorithm 5 of Chinese) are computer security
The widely used a kind of hash function in field, to provide the integrity protection of message.The document number of the algorithm is RFC 1321
(R.Rivest,MIT Laboratory for Computer Science and RSA Data Security Inc.April
1992)
MD5 is Message-Digest Algorithm 5 (Message-Digest Algorithm 5), for ensuring that information transfer is complete
Unanimously.It is one of widely used hash algorithm of computer (translating digest algorithm, hash algorithm again), main flow programming language is universal
There are MD5 realizations.
It is another fixed-length value by data (such as Chinese character) computing, is the basic principle of hash algorithm, MD5 predecessor has
MD2, MD3 and MD4.
MD5 effect is to allow Large Copacity information to be protected before private key is signed with digital signature software by " compression " into one kind
Close form (being exactly the hexadecimal number word string for the byte serial of a random length being transformed into a fixed length).
Typical case is to produce informative abstract (Message-Digest) to a segment information (Message), to prevent from being usurped
Change.For example there are many softwares to have that a filename is identical when downloading under Unix, the entitled .md5 of file extent text
Part, generally there was only a line text in this document, general configuration is such as：
MD5 (tanajiya.tar.gz)=0ca175b9c0f726a831d895e269332461
Here it is the digital signature of tanajiya.tar.gz files.MD5 by whole file as a big text message,
Scaling method is become by its irreversible character string, generates this unique MD5 informative abstract.In order to which the application to MD5 has more
Intuitively recognize, its course of work once is briefly described with an example with an analogy below：
It is known that anyone has oneself unique fingerprint on the earth, this usually turns into judicial authority and differentiated
The most trustworthy method of criminal's identity；Similar therewith, MD5 can think any file (no matter its size, form, quantity) production
Raw one same unique " digital finger-print ", if anyone has done any change to file, its MD5 value is namely corresponding
" digital finger-print " can all change.
Its MD5 value is usually seen in certain software information of some software download sites, its effect is that we can
So that after the software is downloaded, a MD5 is with special software (such as Windows MD5 Check) to downloading the file returned
Verification, the file provided using the file for ensuring to obtain with the website is identical file.File verification is carried out using MD5 algorithms
Scheme is widely applied software download website, forum data storehouse, system file security etc..
MD5 message digest algorithms：MD5 message digest algorithms are converted using the information of random length as input value
" finger print information " or " message digest " value into 128 bit length represent this input value, and using the value after conversion as
As a result.MD5 algorithms mainly design for digital signature applications program；It is larger in this digital signature applications program
File will encryption (ciphering process here be by under a cryptographic system [such as：RSA] public-key cryptography under set it is privately owned
Key and complete) before be compressed in a secure manner.
Fig. 1 is referred to, Fig. 1 is the method flow of the application data backup of storage reduction based on MD5 codes in the present embodiment one
Figure.The method of the reduction of the application data backup of storage based on MD5 codes shown in Fig. 1 so that user can be by application data
Upload onto the server and backed up, and what is uploaded is variance data file, saves the data traffic for uploading and downloading, simultaneously
This backup and recovery are to improve the validity of application data recovery as distinguishing rule according to MD5 codes, make answering for user
Easily it can be synchronized with routine data in another intelligent mobile terminal equipment.This method be applied to include mobile phone,
Intelligent mobile terminal including tablet personal computer, notebook and palm equipment for surfing the net etc., this method specifically include following steps：
The associated documents of application program are passed through MD5 information by ■ steps S1, application data backup storage, the step
Digest algorithm calculates the MD5 values of each file, then the version number together with application program, related All Files title and
Directory path backup is stored on cloud server existing for corresponding.
After the first installation of application program, some data letter can be produced in the associative directory of/data catalogues and SD card
Breath, application developer provides all these data, the corresponding version number of each version and each data directory, by number
MD5 values are calculated according to the All Files under catalogue, directory path existing for the title of All Files, MD5 values and correspondence is remembered
Record is got off, and all these data and version number constitute a mapping, and data preserve on the server.It should be noted that
The first time backup storage carried out to application data can be that application program has just installed either application program use
After operation a period of time.
The step is specifically subdivided into following sub-step again：
Step S101, the installation directory of application program and the All Files information of data directory are obtained, by above catalogue
All Files the MD5 values of each file are calculated by MD5 message digest algorithms respectively；
Step S102, by the title of the set of the installation directory of the application program and the All Files of data directory, respectively
MD5 values corresponding to individual file and it is corresponding existing for directory path preserved as the first data storage bag, and by the
The version number of one data storage bag and application program constitutes a mapping relations；
Wherein described mapping relations are a kind of corresponding relations, the structure that can enter these relation records in program
In.Such as：Version A is corresponding：Each text in md5 corresponding to each file in filename set aa (many filenames), aa, aa
Storage catalogue corresponding to part.
Step S103, the first data storage bag is saved on cloud server.
■ steps S2, application data download recover, and the step is beaten as user in another intelligent mobile terminal
Open and when the information registration that accesses to your account enters this application program, carry out the renewal of application program and application data download it is extensive
It is multiple.
It is different herein according to version number, to re-download application version, be for some application versions forward
Compatibility do bad, prevent incompatible using the application data on cloud server and the application program that is locally-downloaded
And cause to use abnormal problem.Once edition upgrading is to the version uploaded on cloud server, and data are also updated to service
Version on device, then the version of the version of subsequent upgrade renewal typically will not be problematic, because most application programs are all
It is back compatible.
The step is specifically subdivided into following sub-step again：
S201, when user select carry out application program renewal and application data download recover when, contrast apply journey
Whether sequence version number is identical, if version number is different, first by application program update to the application version number backed up, if version
This number identical, then not more new application；
The installation directory for the application program that S202, acquisition will be updated and the All Files information of data directory, will be with
All Files in upper catalogue calculates the MD5 values of each file by MD5 message digest algorithms respectively；
S203, each file of application program for storing the MD5 values of each file in the step S202 with backup MD5
Value is contrasted, and finds out the different differential file of MD5 values；
S204, from cloud server download discrepancy data, differential file is decompressed according to the directory path of differential file
To corresponding path, the renewal of application data is completed.
■ steps S3, the backup updating of application data, should during the step uses this application program for user
Situation about can be changed with the file of program, user can select to carry out application data backup of storage renewal at any time, will apply
The associated documents of program calculate the MD5 values of each file by MD5 message digest algorithms, by each file after backup updating
MD5 values and the MD5 values of each file of last backup storage are contrasted, and the different file of MD5 values are found out, by above institute
Have the title of the set of the different file of MD5 values, MD5 values corresponding to file and it is corresponding existing for directory path record,
The version number of all these data and application program constitutes a mapping relations, and saves the data in cloud server
On.
During user uses this application program, many data directory files of application program can change, and work as user
When needing backup, the step of according to MD5 values are recorded in step 1, the MD5 values of new All Files are recorded.By this MD5 values
Contrasted with the data in step 1, data difference is recorded out according to file name, MD5 values and directory name, journey will be applied
Sequence version number, variance data packing upload onto the server.And by discrepancy data, application version number and the account of user
Family information is bound.
Embodiment two
Fig. 2 is referred to, Fig. 2 is the system composition of the application data backup of storage reduction based on MD5 codes in the present embodiment two
Block diagram.The present embodiment two discloses a kind of system of the application data backup of storage reduction based on MD5 codes, applied to intelligent mobile
In terminal, wherein the intelligent mobile terminal includes mobile phone, tablet personal computer and palm equipment for surfing the net.Understand as shown in Figure 2, this is
System includes following devices：
1st, the backup storage device of application data,
The device calculates the associated documents of application program by MD5 message digest algorithms the MD5 values of each file, so
Afterwards the version number together with application program, related All Files title and it is corresponding existing for directory path backup storage beyond the clouds
On server.
This device can specifically be subdivided into following modules again：
First fileinfo MD5 value computing modules, the module are used for the installation directory and data directory for obtaining application program
All Files information, the All Files in above catalogue is calculated into each file by MD5 message digest algorithms respectively
MD5 values.
In the device to application data carry out first time backup storage can be application program just installed or
Person is after application program uses operation a period of time, can be selected be backed up at any time according to user.
First data acquisition and version mapping block, the module are used for the installation directory of the application program and data mesh
Directory path existing for MD5 values corresponding to the title of the set of the All Files of record, each file and correspondence is deposited as first
Storage packet data recording is preserved, and the version number of the first data storage bag and application program is constituted into a mapping relations.
First data upload preserving module, and the module is used to deposit first in the first data acquisition and version mapping block
Storage packet is uploaded on cloud server.
2nd, the download recovery device of application data,
The device is opened and the information registration that accesses to your account applies journey into this as user in another intelligent mobile terminal
During sequence, carry out the renewal of application program and application data is downloaded and recovered.
This device includes following modules again：
Application version update module, the module select to carry out renewal and the application data of application program as user
Download when recovering, it is whether identical for contrasting application version number, if version number is different, first by application program update to standby
Part application version number, if version number is identical, not more new application.
Second fileinfo MD5 value computing modules, the module are used for the installation mesh for obtaining the application program that will be updated
Record and the All Files information of data directory, and the All Files in above catalogue is passed through into MD5 message digest algorithm meters respectively
Calculate the MD5 values of each file.
Differential file searches comparing module, and the module is used for will be each in the second fileinfo MD5 value computing modules
The MD5 values of file and the MD5 values of each file of application program of backup storage are contrasted, and find out the different difference of MD5 values
File.
Application data download module, the module are used to download discrepancy data from cloud server, according to difference text
Differential file is unziped to corresponding path by the directory path of part, completes the renewal of application data.
3rd, the backup updating device of application data,
During the device uses this application program for user, situation that the file of application program can change is used
Family can use present apparatus selection to carry out application data backup of storage renewal at any time, and the associated documents of application program are passed through into MD5
Message digest algorithm calculates the MD5 values of each file, and the MD5 values of each file after backup updating and last backup are stored
The MD5 values of each file contrasted, the different file of MD5 values is found out, by the collection of the different file of all of above MD5 values
MD5 values corresponding to the title of conjunction, file and it is corresponding existing for directory path record, all these data and using journey
The version number of sequence constitutes a mapping relations, and saves the data on cloud server.
It is worth noting that, in said system embodiment, included each device and module are simply according to function logic
Divided, but be not limited to above-mentioned division, as long as corresponding function can be realized；In addition, each device and mould
The specific name of block is also only to facilitate mutually distinguish, the protection domain being not intended to limit the invention.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (5)
1. a kind of method of the application data backup of storage reduction based on MD5 codes, applied to intelligent mobile terminal, its feature exists
In comprising the following steps：
S1, application data backup storage, the backup storage intelligent mobile terminal of the application data will apply journey
The associated documents of sequence calculate the MD5 values of each file by MD5 message digest algorithms, then together with the version of application program
Number, the title of related All Files and it is corresponding existing for directory path backup be stored on cloud server；
The step S1 is specially：
S101, the installation directory for obtaining application program and data directory All Files information, by the installation of the application program
All Files in catalogue and data directory calculates the MD5 values of each file by MD5 message digest algorithms respectively；
S102, by the title of the set of the installation directory of the application program and the All Files of data directory, each file pair
Directory path existing for the MD5 values and correspondence answered preserves as the first data storage bag, and stores number by first
A mapping relations are constituted according to the version number of bag and application program；
S103, the first data storage bag is saved on cloud server；
S2, application data download recover, and the download of the application data recovers when user is in another intelligence
When mobile terminal is opened and the information registration that accesses to your account enters this application program, renewal and the application program number of application program are carried out
Recover according to downloading；
The step S2 is specially：
S201, when user select carry out application program renewal and application data download recover when, contrast application program version
Whether this number identical, if version number is different, first by application program update to the application version number backed up, if version number
It is identical, then not more new application；
The installation directory for the application program that S202, acquisition will be resumed and the All Files information of data directory, will described be
All Files in the installation directory and data directory of the application program being resumed is calculated by MD5 message digest algorithms respectively
Go out the MD5 values of each file；
S203, the MD5 values for each file of application program for storing the MD5 values of each file in the step S202 and backup are entered
Row contrast, finds out the different differential file of MD5 values；
S204, from cloud server download discrepancy data, differential file is unziped to by phase according to the directory path of differential file
The path answered, complete the recovery of application data；
S3, application data backup updating, the backup updating of the application data apply journey for user using this
In program process, situation that the file of application program can change, user's selection carries out application data backup of storage renewal at any time,
The associated documents of application program are calculated to the MD5 values of each file by MD5 message digest algorithms, will be each after backup updating
The MD5 values of file and the MD5 values of each file of last backup storage are contrasted, and find out the different file of MD5 values, will
MD5 values corresponding to the title of the set of the different file of all of above MD5 values, file and it is corresponding existing for directory path record
Get off, the version number of all these data and application program constitutes a mapping relations, according to file name, MD5 values with
And directory name records out data difference, application version number, variance data packing are uploaded to cloud server, and will
Discrepancy data, application version number and the accounts information of user are bound.
2. a kind of method of application data backup of storage reduction based on MD5 codes according to claim 1, its feature exist
In：
The first time backup storage carried out in the step S1 to application data is that application program has just installed either
After application program is using operation a period of time.
3. a kind of method of application data backup of storage reduction based on MD5 codes according to claim 1 or 2, its feature
It is：
Described intelligent mobile terminal includes mobile phone, notebook computer, tablet personal computer and palm equipment for surfing the net.
4. a kind of system of the application data backup of storage reduction based on MD5 codes, applied to intelligent mobile terminal, its feature exists
In, including following devices：
The backup storage device of application data, the backup storage device of the application data is by the correlation of application program
File calculates the MD5 values of each file by MD5 message digest algorithms, then the version number together with application program, related institute
Directory path backup is stored on cloud server existing for documentary title and correspondence；
The backup storage device of the application data includes：
First fileinfo MD5 value computing modules, the first fileinfo MD5 values computing module are used to obtain application program
The All Files information of installation directory and data directory, by all texts in the installation directory and data directory of the application program
Part calculates the MD5 values of each file by MD5 message digest algorithms respectively；
First data acquisition and version mapping block, first data acquisition and version mapping block are used to apply journey by described
MD5 values corresponding to the title of the set of the installation directory of sequence and the All Files of data directory, each file and correspondingly exist
Directory path preserved as the first data storage bag, and by the first data storage bag and the version number of application program
Constitute a mapping relations；
First data upload preserving module, and first data upload preserving module and are used to map the first data acquisition and version
The first data storage in module, which is wrapped, to be passed on cloud server；
The download recovery device of application data, the download recovery device of the application data is when user is at another
When intelligent mobile terminal is opened and the information registration that accesses to your account enters this application program, the renewal of application program is carried out and using journey
Ordinal number recovers according to download；
The download recovery device of the application data includes：
Application version update module, the application version update module select to carry out the renewal of application program as user
It is whether identical for contrasting application version number when downloading recovery with application data, if version number is different, first should
With the application version number of program renewal to backup, if version number is identical, not more new application；
Second fileinfo MD5 value computing modules, the second fileinfo MD5 values computing module, which is used for acquisition, to be resumed
The installation directory of application program and the All Files information of data directory, and by the peace of the application program that will be resumed
All Files in dress catalogue and data directory calculates the MD5 values of each file by MD5 message digest algorithms respectively；
Differential file searches comparing module, and the differential file is searched comparing module and is used for the second fileinfo MD5 values
The MD5 values of each file and the MD5 values of each file of application program of backup storage are contrasted in computing module, are found out
The different differential file of MD5 values；
Application data download module, the application data download module are used to download variance data from cloud server
Bag, unzips to corresponding path by differential file according to the directory path of differential file, completes the recovery of application data；
The backup updating device of application data, the backup updating device of the application data should using this for user
With in program process, situation that the file of application program can change, user using the application data backup more
New equipment selection carries out application data backup of storage renewal at any time, and the associated documents of application program are calculated by MD5 informative abstracts
Method calculates the MD5 values of each file, by the MD5 values of each file after backup updating and the last each file for backing up storage
MD5 values contrasted, find out the different file of MD5 values, by the title of the set of the different file of all of above MD5 values,
Directory path existing for MD5 values corresponding to file and correspondence is recorded, the version of all these data and application program
Number a mapping relations are constituted, data difference is recorded out according to file name, MD5 values and directory name, by application program
Version number, variance data packing are uploaded to cloud server, and by discrepancy data, application version number and user
Accounts information is bound.
5. a kind of system of application data backup of storage reduction based on MD5 codes according to claim 4, its feature exist
In：
The first time backup storage carried out in the backup storage device of the application data to application data is application
Program was just installed after either application program use operation a period of time.
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