CN1312550C

CN1312550C - Method for dumping data to mobile storage medium and extracting data therefrom

Info

Publication number: CN1312550C
Application number: CNB2005100593582A
Authority: CN
Inventors: 王川; 左湘东; 吕宾
Original assignee: BEIJING THUNISOFT Co Ltd
Current assignee: Beijing Thunisoft Information Technology Co ltd
Priority date: 2005-03-28
Filing date: 2005-03-28
Publication date: 2007-04-25
Anticipated expiration: 2025-03-28
Also published as: CN1655089A

Abstract

The present invention relates to a method for dumping original data stored in a file to a mobile storage medium, which comprises the following steps: (A), a plurality of files which are designated by a parameter are read one by one, and the files are connected and merged in a memory into byte flow which is called primary flow; (B), the primary flow is compressed to form another byte flow which is called storage flow; (C), byte adding sum of the storage flow is calculated; (D), a memory interface mark, the length of the storage flow, the length of the primary flow, the byte adding sum and contents of the storage flow are written into a mobile medium. In addition, the present invention provides a method for extracting the mobile medium from the data and restoring to the files, wherein datum access (reading/writing) on the mobile storage medium is not presented in the form of the files. Thus computer virus infection can be avoided, and viral transmission can be forbidden.

Description

A kind of with data dump to mobile memory medium and the method for extracting data from it

Invention field

Core of the present invention be a kind of with data dump to mobile memory medium and the method for extracting data from it, mobile memory medium mainly refers to floppy disk, USB flash disk, disk cartridge etc., wherein, 3.25 inches floppy disks (capacity 1.44M) are the storage mediums that the low volume data of main flow is is frequently reported and submitted.

Background technology

The dump of data, transmission and extraction, utilization again are the activities of exchanges data, come transfer by mobile memory medium, are that traditional, simple technology realizes.The construction of computer network for the realization of exchanges data provides better platform, but owing to following several reasons, uses move media to transmit the scheme of data, in one period, still has sufficient application foundation and wide application stage.

One of reason: the deployment at computing machine networking is subjected to the restriction of environmental factors such as economy, geography always according to certain planning, can only take a long view, generally all will be stage by stage, the subregion builds step by step, be difficult to accomplish to be all on board in a short time.

Former therefore two: the network of certain industry inside needs already through long-term effort, could build satisfactory, network between the industry connects, then more introduced the problem that many complicated more needs are paid close attention to, wherein the rank of network security increases substantially, to technology, administer and maintain and all proposed stern challenge, so for for the purpose of the steady development, in long period, the exchanges data between the industry still can not realize by network widely.

Former therefore three: the application that some are special, as the upwards recommendation for admission to school of periodic data of a large amount of branch officeses, moment is very high to the requirement of the network bandwidth, is difficult to satisfy for the moment.

Even traditional datagram delivery method is realized in concrete technology, also there is many difference.

The simplest only be that file is copied on move media and mounting medium, further be before copying move media to earlier from mounting medium, to file compress (more when file, data volume is bigger, when especially data redudancy is higher, benefit obviously), form the file of the final storage of another one, promptly copy is file after the compression.

It is to pass through formatively in advance that above-mentioned two kinds of methods all require medium, has the document structure management that operating system is supported on the medium, use all that operating system provides powerful and therefore file processing function flexibly realizes easily, and compatible good.But computer nowadays virus overflowing, Miscellaneous Documents just is one of important channel of viral object, the place of staying in and the propagation of paying close attention to, so, and when mobile memory medium is sent in the intended application environment, whether pure to data wherein, could relievedly use, all need query.

Computer virus is a kind of rogue program fragment, mainly is divided into two kinds: system type and file type.System type virus is distorted the actuating section of operating system, thus claim boot-type virus again, the code of establishment exquisiteness mostly, body program, after system type virus is distorted, virus will have been intercepted and captured the control of system early.File Infector Virus is embedded in executable program in the operating system (.EXE/.DLL/.COM etc.) or supports in the file (.DOC/.EML etc.) of script, What is more, as watermark, be hidden in some data and inner the realization in the self-contained file (.JPG/.TTF etc.), carry out in program, document is opened or normal application according to interface interchange interception system control during built-in function wherein.A kind of virus can have above-mentioned two kinds of features simultaneously, on the contrary, simple system type virus is because available resource (powerful file access function, network function etc.) is less, realize propagating and show effect and all be subjected to many restrictions, writing also of virus is not easy very much, almost disappeares at present, promptly do not utilize substantially unmanned interesting accident of virus of file system fully, so, file has just become the object of viral special favor.

Antagonism virus is mainly started with from two aspects: killing, prevent.Whether killing is a scan storage media, look to have virus to stay in, and finds to handle again; Prevent it is on the basis to system monitoring, the intention of active process in the analytic system if any performance unusual (the important sensitive data of modification system or invade and harass other process, program etc.), is forbidden.

From the analysis of above virus mechanism, computer virus is now looked for by file access always and is stayed in the place.All functions that operating system provides have made things convenient for the realization of positive application, and virus also can utilize it to stir up trouble, so, oppositely go, the file system format with the operating system support does not visit data, is a kind of scheme of avoiding virus.

Do not visit data with document form, the file processing function that just can not use operating system to provide, need adopt the comparatively direct addressing means of storage medium of bottom, this method has significant disadvantages, be exactly that compatibility is not good, show two aspects: the firstth, specific program can only be visited specific data, otherwise, the data that the desire visit is specific just need be write specific program; The secondth, the bottom medium access technology that different operating system provides is not quite similar, and can not realize with unified method as file access, needs at least to realize respectively with regard to the several operation systems of main flow.Because the existence of this defective, this technology is not suitable for adopting in universal product, for example word processing (Word/WPS etc.), graph and image processing Software tools such as (CorelDraw/PhotoShop etc.); Yet, investigate the dedicated service software of every profession and trade, but find, this technology has using value, since a kind of just specific program of industry software, also a kind of just specific data of data that it is handled, painstakingly do not pursue compatible, safety of data is then high more good more, that is to say, has the reason that adopts the technical scheme that the present invention relates to; And the aspect of the another one poor compatibility of this technology, the then specific implementation of core concept of the present invention just.

Summary of the invention

In order to solve above-mentioned problem about data security (mainly being virus infraction), and the other problem of not mentioning of the prior art, the present invention is proposed.

According to an aspect of the present invention, provide a kind of with the method for former storage data dump hereof to the mobile memory medium, this method may further comprise the steps: (A) read a plurality of files by the parameter appointment one by one, in internal memory, connect, merge and become a byte stream, be called primary flow; (B) primary flow is compressed, form the another one byte stream, be called storage flow; (C) byte of calculating storage flow add up and; And (D) successively with memory interface sign, storage flow length, primary flow length, byte adds up and, the storage flow content writes move media.

According to another aspect of the present invention, a kind of method that data is extracted and are reduced to file from move media is provided, this method may further comprise the steps: (A) read first storage cell of move media, judge whether to have the memory interface sign, satisfy just and continue; (B) obtain storage flow length, primary flow length and byte adds up and; (C) according to storage flow length, read the data in the storage cell of some, promptly read the storage flow content; (D) byte that recomputates the storage flow content that has just obtained add up and, add up with the byte that in step (B), obtains and compare identical just continuation; (E) storage flow is decompressed, restore primary flow; And, further restore raw data file (F) according to the structure of primary flow, and be kept in the path by the parameter appointment, keep old file name.

Description of drawings

Learn above-mentioned and other purpose of the present invention, feature with from following detailed description, may be obvious that, and advantage.

Fig. 1 has provided the main-process stream block diagram according to the embodiment of the invention;

Fig. 2 has provided being used for the process flow diagram of data dump to move media according to the embodiment of the invention;

Fig. 3 has provided the floppy disk storage layout according to the embodiment of the invention;

Fig. 4 has provided the internal data structure according to the primary flow of the embodiment of the invention; And

Fig. 5 has provided the process flow diagram that is used for extracting from move media data according to the embodiment of the invention.

Embodiment

With reference to the accompanying drawings, embodiments of the invention are described in detail as follows.

As shown in Figure 1, at first extract the data of wanting dump, form data file by special industrial application software.Special industrial application software is not the application's a inventive point, it is not elaborated at this, but such common recognition should be arranged: although special industrial application software has nothing in common with each other, have tangible general character, that is exactly that the data of foreign exchanges are preserved hereof.Secondly, formed data file is dumped on the move media by processing shown in Figure 2.Subsequently, according to the sector application deployment scheme, carry out moving such as media such as floppy disk, USB flash disk, disk cartridge transmission.Next,, from move media, extract data, on the mounting medium of data application places, form data file again by processing shown in Figure 3.At last, special industrial application software with the form deal with data of file, continues operation flow again.

It should be noted that most of exchanges data are that low volume data regularly or is is irregularly frequently reported and submitted, floppy disk remains the main flow storage medium that data are reported and submitted owing to cheap, so process prescription and following detailed are example with the floppy disk in the accompanying drawing.

With reference to figure 2, to data dump is specifically described to the main process on the move media, having omitted some does not influence branch's details of spirit comprehension, and for example file reads fault processing mechanism such as failure, move media visit failure.

At step 2A, read a plurality of files by the parameter appointment one by one in internal memory, connect, merge into a byte stream, be called primary flow.The internal data structure of primary flow as shown in Figure 4.

At step 2B, byte stream is compressed, form the another one byte stream, be called storage flow;

At step 2C, calculate each byte of storage flow add up and; And

At step 2D, successively the byte of memory interface sign, storage flow length, primary flow length, storage flow is added up and, the content of storage flow writes floppy disk.

Below we to describing by the memory location of the handled data of Fig. 2 in floppy disk.

From first sector (boot section) of floppy disk just, according to fixing structure, order writes several sectors of data continuously.Write after the data like this, just do not comprise executable code in the boot section, do not comprise the floppy base numerical table, concerning file system yet, do not pass through formative naked medium just like one, refuse common trial visits diskette data with document form operation naturally.When forfeiture was compatible, the infringement of having resisted boot-type virus had guaranteed the cleaning of data, has reduced the risk of applied environment.

Floppy disk storage layout as shown in Figure 5.

With reference to figure 3, the flow process of extracting data from mobile memory medium, being reduced into file is carried out concrete description, having omitted some does not influence branch's details of spirit comprehension, for example medium access failure, creates fault processing mechanism such as file failure.

At step 3A, read first sector of floppy disk, judge whether to have the memory interface sign of agreement, meet just and continue, do not meet then and finish;

At step 3B, obtain storage flow length, primary flow length, byte adds up and

At step 3C,, read the data in the sector of some according to the length of storage flow;

At step 3D, the byte of calculating sense data add up and, compare with adding up of in step 3B, obtaining and (it is good to calculate before the storage), consistently just continue, otherwise be the data check failure, end;

At step 3E, the data stream of reading is regarded as storage flow, it is decompressed, restore primary flow;

At step 3F, the structure according to primary flow restores file, and file is kept in the path by the parameter appointment, keeps old file name.The structure of above-mentioned primary flow is referring to Fig. 4.

What may be obvious that for the person of ordinary skill of the art draws other advantages and modification.Therefore, the present invention with wider aspect is not limited to shown and described specifying and exemplary embodiment here.Therefore, under situation about not breaking away from, can make various modifications to it by the spirit and scope of claim and the defined general inventive concept of equivalents thereof subsequently.

Claims

1, a kind of with the method for former storage data dump hereof to the mobile memory medium, this method may further comprise the steps:

(A) read a plurality of files one by one, in internal memory, connect, merge and become a byte stream, be called primary flow by the parameter appointment;

(B) primary flow is compressed, form the another one byte stream, be called storage flow;

(C) byte of calculating storage flow add up and; And

(D) successively with memory interface sign, storage flow length, primary flow length, byte adds up and, the storage flow content writes move media.

2, a kind of data are extracted and be reduced to the method for file from move media, this method may further comprise the steps:

(A) read first storage cell of move media, judge whether to have the memory interface sign, satisfy just continuation;

(B) obtain storage flow length, primary flow length and byte adds up and;

(C) according to storage flow length, read the data in the storage cell of some, promptly read the storage flow content;

(D) byte that recomputates the storage flow content that has just obtained add up and, add up with the byte that in step (B), obtains and compare identical just continuation;

(E) storage flow is decompressed, restore primary flow; And

(F) according to the structure of primary flow, further restore raw data file, be kept at the path of depositing, keep old file name by the number appointment.