CN101908050B - File format conversion method - Google Patents
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- CN101908050B CN101908050B CN 200910143548 CN200910143548A CN101908050B CN 101908050 B CN101908050 B CN 101908050B CN 200910143548 CN200910143548 CN 200910143548 CN 200910143548 A CN200910143548 A CN 200910143548A CN 101908050 B CN101908050 B CN 101908050B
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Abstract
The invention discloses a file format conversion method for converting a first format file of a first file system into a second format file of a second file system in a storage device. The method ensures that stored files can be read on other systems, the reading speed and efficiency of the files can be improved, and the compatibility problem that a file system in the prior art can not be read by a FAT (File Allocation Table) system can be solved. The file format conversion method comprises the steps of: establishing a temporary file and setting one data volume of the temporary file as a first specific value, setting one starting position of the temporary file as same as a starting position of the first format file, then changing the data volume of the temporary file as same as one data volume of the first format file to generate a second format file.
Description
Technical field
The present invention relates to file format conversion method, particularly archives are transformed into the file format conversion method of the archives that the FAT system can read.
Background technology
In the prior art, usually use FAT (File Allocation Table, FAT) system to be used as managing the storage area of storage device and the instrument of data memory at storage device.Yet, must in the FAT table, seek next available magnetic bunch (Cluster) when under the FAT system, wanting access data and upgrade the FAT table.The degree (or claiming disk degree of crushing) that the time of this type of searching can disperse along with the usage space of storage device and storage area and different.Generally speaking, the storage area is overstepping the bounds of propriety loose, and required time is longer.And, when upgrading the FAT table, must start anew from the gauge outfit of FAT table to seek at every turn.Therefore can expend the considerable time, the device of the data of can't satisfying the demand fast reading and writing is (such as personal digital video recorder's-PVR) read-write demand.
In addition, some supports the environment of FAT archives economy to have for same archives once only can open an authority that reads or writes, therefore after running through archives, if wish is carried out the action of writing to same archives, open and could carry out after then these archives must being closed, vice versa.So way will allow the read-write usefulness of the storage device that uses the FAT system produce the problem of wretched insufficiency.
And; even some technology has been set up new stocking system for this point and has been done improvement; also usually can exist the compatibility issue that the archives that produce can't be read by the FAT system in new stocking system, and significantly lower the user comes storage data with new stocking system wish.
Summary of the invention
Technical matters to be solved by this invention provides a kind of file format conversion method, the method can be so that the archives that store can be read in other system, Effective Raise archives read or write speed and usefulness, and can solve the compatibility issue that prior art Archives system can't be read by the FAT system.
In order to solve above technical matters, the invention provides following technical scheme:
The invention provides a kind of file format conversion method, convert one second form archives of one second archives economy in order to one first form archives with one first archives economy in the storage device, this file format conversion method comprises: set up a temporary file, and a data volume of this temporary file is set as one first particular value; One initial set positions of this temporary file is become to be same as an initial position of these the first form archives; And upgrade this data volume of this temporary file according to a data volume of these the first form archives, to obtain this second form archives.
The present invention also provides a kind of file format conversion method, convert one first form archives of one first archives economy in order to one second form archives with one second archives economy in the storage device, wherein this second archives economy is a FAT archives economy, it has a FAT, and this first archives economy system is built on this second archives economy, and this file format conversion method comprises: the data volume with these the second form archives in this FAT changes a predetermined value into; And in this FAT, set up this first form archives, make the initial position of these the first form archives in this storage device be same as an initial position of these the second form archives.
File format conversion method of the present invention can be by converting original enclosed archives economy to convenience that the FAT archives economy increases data access, so that the archives that store can be read in other system Effective Raise archives read or write speed and usefulness.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is for converting the FAT system to the concept map of data agglomerate system.
Fig. 2 is data file in the data agglomerate system and the synoptic diagram of data agglomerate.
Fig. 3 is the synoptic diagram of the data agglomerate concordance list in the data agglomerate system.
Fig. 4 to Fig. 7 is the synoptic diagram of the file format conversion method of embodiments of the invention.
Fig. 8 is the process flow diagram of the file format conversion method of embodiments of the invention.
[primary clustering symbol description]
Each assembly that comprises in the accompanying drawing of the present invention lists as follows:
Storage area in 200 stocking systems
201～217 data agglomerates
218 storage areas
219,221,223,225,227 data files
300 data agglomerate concordance lists
301 data agglomerate header messages
303 section start informations
305 allocation lists
307～317 data agglomerate items for information
401 data files
403,405,407 data agglomerates
409 data agglomerate concordance lists
411 data agglomerate header messages
413 section start informations
415 allocation lists
417～425 data agglomerate items for information
The 427FAT concordance list
601 first data agglomerates
603 second data agglomerates
605 the 3rd data agglomerates
801～803 steps
Embodiment
System of FAT system utilizes a FAT concordance list (FAT) to manage a storage device, under this kind way, data are disperseed when being stored to the FAT system, and the address of its storage can be stored in the FAT concordance list, can inquire about the FAT concordance list so that desired data is read out when reading.Fig. 1 is for converting the FAT system to the concept map of data agglomerate system.For improving the usefulness of FAT system, tie up under the framework of FAT system, preformatting FAT concordance list, storage area in the storage device is formulated for comprises a plurality of data agglomerates (bulk), it is a storage element that each data agglomerate can be considered, and produces a data agglomerate index (bulkindex) table.Being distributed in the FAT concordance list of this data agglomerate is continuous, and data agglomerate concordance list has then been noted down the relevant information of various data storings, under will being data agglomerate, data agglomerate archives and data agglomerate concordance list is described in detail.
Fig. 2 is data file in the data agglomerate system and the synoptic diagram of data agglomerate.As shown in Figure 2, at least one part of the storage area 200 in the storage device is divided into plural data agglomerate 201～217, and 218 of storage areas are the storage areas that is not used.The large I of data agglomerate 201～217 has different settings according to different demands.Data file (data file) 219,221,223,225 and 227 is stored in respectively in the data agglomerate 201～217.Data file 219 is to be stored in the continuous two data agglomerates 201 and 203, data file 221,223 and 225 items minutes other be stored on the data agglomerate 207～211, and data file 227 is to be stored in the continuous two data agglomerates 215 and 217.From the above, when data file must store with plural data agglomerate, can be stored in the continuous data agglomerate, and can as existing FAT system, be not to be stored in the sector of dispersion.And the address relevant information of its storage can be stored in the middle of the data agglomerate concordance list, must not go again to seek the speed in the time of therefore can increasing read-write in the access as existing FAT system.In a preferred embodiment, each data agglomerate only is used for storing single data file, and meaning namely after a data agglomerate has stored a data file, although also have remaining storage area, also can not be used for storing other data file.And when the size of a data file surpassed the capacity of a data agglomerate, this data file system can be stored in a plurality of continuous data agglomerates.
Fig. 3 is the synoptic diagram of the data agglomerate concordance list in the data agglomerate system.As shown in Figure 3, data agglomerate concordance list 300 comprises data agglomerate stem (Bulk Header) information 301, a section start information (Sector Starting Information) 303, one allocation list (Allocation Table) 305 and plural data agglomerate clauses and subclauses (Bulk Entry) information 307～317.In one embodiment, each part of data agglomerate concordance list 300 has occupied the space of 4K size, therefore whole data agglomerate concordance list 300 can occupy the size of (4+N) * 4K, wherein N is the number of data agglomerate clauses and subclauses, and each data agglomerate clauses and subclauses has all recorded the information of data file stored in the data agglomerate.Data agglomerate header message 301 can be considered system information, it has noted down the various information of data agglomerate system, such as: the data agglomerate of whole system is total, data agglomerate system uses the size of storage device, stored the data agglomerate number of data file etc.Section start information 303 is record storage element entity information, and it has noted down the corresponding relation of the solid element of the storage element that marks off according to embodiments of the invention and storage device.For instance, section start information 303 has been noted down the reference position of each data agglomerate in storage device.
After data file stores, can note down the access site of data file with at least two access parameters (for example: reading pointer and write pointer), and upgrade the value of access parameter according to the data volume of the data cell of having read and write.Specifically, before beginning data writing file, can make with archives function of searching and archives read and write position the address (namely finding out corresponding section value) of data file, this step can be sketched such as formula (one)
Formula (one)
Section=data bit begins section+(searching the position of bit length/each section)
Via above-mentioned step, the section that reads and the section that writes can be calculated and be got by formula (two) and (three).
Formula (two)
Read section=data bit and begin section+(archives read the position of bit length/each section)
Formula (three)
Write section=data bit and begin section+(archives write the position of bit length/each section)
According to above-mentioned access action, can allow the data file must be not the same with existing FAT system when access, get and search first the FAT concordance list to find out next continuous magnetic bunch, therefore can accelerate its access speed.And unlike existing FAT system, once only can open an authority that reads or writes for same archives, and therefore need constantly not open or close archives, therefore can save the time of file accessing.
Although aforesaid data agglomerate system can accelerate the speed of data access, but after the user utilizes data agglomerate system that archives are stored, do not install data agglomerate system and when the storage device of FAT system is only arranged if it will be moved to other, just the data that stored can't be read, so the wish that the user uses data agglomerate system will be reduced.For this reason, the present invention proposes a kind of File Format conversion regime, in order to converting data agglomerate system Archives to be compatible with the FAT system File Format, beneathly will describe File Format conversion regime of the present invention in detail by embodiment.
Fig. 4 to Fig. 7 is the synoptic diagram of the file format conversion method of embodiments of the invention, is please joining alternately these diagrams more to understand spirit of the present invention.In the embodiment shown in fig. 4, data file 401 is in the continuous data that the is stored in agglomerate 403,405 and 407.And data agglomerate concordance list 409 has comprised previous described data agglomerate header message 411, section start information 413, allocation list 415 and plural data agglomerate items for information 417～425.In one embodiment, data agglomerate concordance list 409 is stored in wherein in the data agglomerate.In this embodiment, the preliminary sectors of data file 401 is 0x7930, shown in section start information 413, and the data agglomerate that data file 401 contains has comprised the first to the 3rd data agglomerate Bulk 1-3 (being data agglomerate 403,405 and 407), shown in allocation list 415.Be 130MB (0x8200000) and the file name of data file 401 is File1.TS, file length, its initial data agglomerate is first data agglomerate, shown in data agglomerate items for information 417.In order to allow the FAT system be read in data file 401 stored under the data agglomerate system, can in the FAT concordance list, create first a temporary file (that is a virtual data unit) in this embodiment.The various parameters of temporary file can be displayed on (the FAT concordance list 427 among Fig. 4 only shows the part of the FAT concordance list in the FAT system) in the middle of the relevant FAT concordance list 427, such as file name, initial magnetic bunch and archives size etc.In this embodiment, file name is that fatFile1.TS, initial magnetic bunch initial value is 0x00000 (also being 0) and the initial value of archives size also is set to 0.It is noted that the initial value of initial magnetic bunch and archives size all can be configured to other value beyond 0.
Next, it is identical that the initial magnetic of temporary file fatFile1.TS bunch can be configured to the address of first data agglomerate Bulk1 (being the data agglomerate 403 of Fig. 4) of data file 401, that is point to same position with first data agglomerate Bulk1, and its archives size can be configured to the archives size of first data agglomerate Bulk1 identical, so the FAT index also has corresponding variation.See also Fig. 5, the initial magnetic of data agglomerate Bulk1 bunch is 0x0004, and the archives size is 64MB, so the initial magnetic of temporary file fatFile1.TS bunch is modified to 0x0004, and the archives size is modified to 64MB.Then, can be modified be 0 to the archives size of data agglomerate Bulk1.After this step executed, if data file has contained more than one data agglomerate, data still can't be read smoothly, therefore the action that the complex data block is linked up need be arranged.
See also Fig. 6, it has illustrated the more action of information so that the complex data block is linked up of changed information agglomerate, and this information system record is in the middle of the FAT concordance list.The left side system of Fig. 6 shows original the first data agglomerate 601, the second data agglomerate 603 and the information of the 3rd data agglomerate 605 in the FAT concordance list, wherein the first data agglomerate 601, the second data agglomerate 603 and the 3rd data agglomerate 605 have respectively a plurality of magnetic bunch, and the data of the inside can comprise the parameter of pointing to next magnetic bunch, for instance, 0x00000005 represents that namely next magnetic bunch is the 6th magnetic bunch (because first magnetic bunch be 00), and 0x00000006 represents that namely next magnetic bunch is the 7th magnetic bunch ... by that analogy.At last bunch then be denoted as 0x0FFFFFFF as the magnetic of ending.By finding out among Fig. 6 that the first data agglomerate 601, the second data agglomerate 603 and the 3rd data agglomerate 605 originally for separately independently, therefore has the magnetic bunch 0x0FFFFFFF as ending.
Yet, even in the case the initial magnetic of virtual data unit bunch is made as with the first data agglomerate 601 identical, and change both archives sizes, and also can only read by temporary file fatFile1.TS the data of first data agglomerate, therefore the action of binding must be arranged.See also the right-hand part of Fig. 6, last magnetic of the first data agglomerate 601 and the second data agglomerate 603 bunch all can be modified to point to the specific magnetic bunch of another data agglomerate.Shown in Fig. 6 right-hand part, last magnetic of the first data agglomerate 601 bunch is modified to 0x00004004, so it can point to the magnetic bunch of the second data agglomerate 603.Same, last magnetic of the second data agglomerate 603 bunch is modified to 0x00008004, so it can point to the magnetic bunch of the 3rd data agglomerate 605.Last magnetic of the 3rd data agglomerate 605 bunch has then comprised the parameter 0x0FFFFFFF that is denoted as ending.By such practice, can with the first data agglomerate 601, the second data agglomerate 603 and the 3rd data agglomerate 605 complete link up with, as long as therefore read temporary file fatFile1.TS, just can read the data of three data agglomerates.It is noted that above-mentioned parameter value and configuration mode be only in order to for example, but be not to limit the present invention.For instance, the first to the 4th magnetic in the FAT system is bunch all in order to storing such as director informations such as stems (header), so it has first magnetic of noting down data bunch usually all with the 5th magnetic bunch beginning.If but concept of the present invention system uses the system outside the FAT system, then magnetic bunch configuration mode with and interior parameter all can be different.
After the data agglomerate has been linked, then as shown in Figure 7 as, the size of temporary file fatFile1.TS is modified to the total amount of data (in this example for 130MB) of three data agglomerates, and the size of the second data agglomerate Bulk2 and the 3rd data agglomerate Bulk3 then changes to 0 as the first data agglomerate Bulk1.Why the size of three data agglomerates all will be changed at last 0 reason and be, the data that so just do not need the backup data agglomerate are to temporary file fatFile1.TS, nor occupy unnecessary storage area.If the value of the first data agglomerate Bulk1, the second data agglomerate Bulk2 and the 3rd data agglomerate Bulk3 is changed to zero other value in addition, identical effect can also be arranged.By above-mentioned step, temporary file fatFile1.TS can be converted into the FAT archives that the FAT system can read (being archives after the last conversion).
Fig. 8 is the process flow diagram of the file format conversion method of embodiments of the invention.Alternately comparison chart 8 and the above embodiments are more to understand the present invention.Fig. 8 has comprised the following step:
Step 801: (for example: fatFile1.TS), and a data volume of temporary file is set to one first particular value when initial to set up a temporary file.
Step 802: an initial location mark of temporary file become (for example: an initial position data file) is identical with one first form archives.
Step 803: the data volume of temporary file is labeled as identical with a data volume size of the first form archives, this moment, temporary file converted one second form archives (FAT archives) to.
Other detailed features is exposed in the middle of above-described embodiment, so do not repeat them here.At an embodiment, above-mentioned action can be by a control circuit (for example: a processor) carry out a specific firmware or software and realize, so, also can realize by individual other circuit.
If wish will be changed good the second form archives (being the FAT archives) and revert to the first form archives (being data file), then can be with above-mentioned step contrary operation.At first the data volume with the second form archives in the FAT concordance list is made as 0, then deletes the second form archives, so just can not delete the FAT concordance list that has established.Then, set up the first form archives corresponding to data agglomerate archives economy in the FAT concordance list, make the archives reference position of the first form archives be same as the archives reference position of the second form archives.Then, form according to data agglomerate archives economy, calculate each data agglomerate in the FAT concordance list ending and (for example: 0x0FFFFFFF) fill out ending symbol, and the archives size of each the data agglomerate in the FAT concordance list is made as the default size of data agglomerate archives economy, therefore, when the archives size of the second form archives surpasses the storage volume of a data agglomerate, the first form archives after its conversion will correspond to a plurality of continuous data agglomerates.At last, in data agglomerate concordance list 409, upgrade the information about the first form archives.
By the above embodiments, can read by original FAT system the stored archives of data agglomerate system, increased the convenience of data access.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (9)
1. file format conversion method, become a FAT data file of a FAT archives economy in order to the data agglomerate data file transition with the data agglomerate system in the storage device, system of described data agglomerate system is built on the described FAT archives economy, system of described data agglomerate system cooks up plural storage element in advance in described storage device, and provide a storage unit index table, in order to record the information of described storage element, it is characterized in that described file format conversion method comprises:
Set up a temporary file, it is the FAT document format data, and a data volume of described temporary file is set as zero;
One initial set positions of described temporary file is become to be same as an initial position of described data agglomerate data file; And
Upgrade the described data volume of described temporary file according to a data quantity of described data agglomerate data file, to obtain described FAT data file.
2. file format conversion method as claimed in claim 1 is characterized in that, described storage unit index table comprises: storage element header message, storage element start information, storage element related information and storage element individual information be one at least wherein.
3. file format conversion method as claimed in claim 1 is characterized in that, described FAT archives economy is a FAT archives economy, and it has a FAT.
4. file format conversion method as claimed in claim 3 is characterized in that, if when described data agglomerate data file was stored in more than one described storage element, described file format conversion method also comprised:
Change the data of the described storage element of corresponding described data agglomerate data file in the described FAT to link the described storage element of corresponding described data agglomerate data file.
5. file format conversion method as claimed in claim 1 is characterized in that, it also comprises:
It is zero that the described data volume of described data agglomerate data file is re-established as.
6. file format conversion method, become a data agglomerate data file of a data agglomerate system in order to the FAT data file transition with the FAT archives economy in the storage device, wherein said FAT archives economy is a FAT archives economy, it has a FAT, and system of described data agglomerate system is built on the described FAT archives economy, system of described data agglomerate system cooks up plural storage element in advance in described storage device, each of described plural storage element all has a predetermined storage volume, it is characterized in that described file format conversion method comprises:
Data volume with described FAT data file in described FAT changes zero into; And
In described FAT, set up described data agglomerate data file, so that the initial position of described data agglomerate data file in described storage device is same as an initial position of described FAT data file.
7. file format conversion method as claimed in claim 6 is characterized in that, if the original data volume of described FAT data file during greater than described predetermined storage volume big or small, described file format conversion method also comprises:
According to described data agglomerate system, in described FAT, recover described storage element, and make described data agglomerate data file corresponding to more than one continuous storage unit in the described storage element.
8. file format conversion method as claimed in claim 6 is characterized in that, described data agglomerate system has a storage unit index table, and in order to record the information of described storage element, described file format conversion method more comprises:
In described storage unit index table, upgrade the information about described data agglomerate data file.
9. file format conversion method as claimed in claim 6 is characterized in that, it also comprises:
Delete described FAT data file.
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|---|---|---|---|---|
| CN1744090A (en) * | 2005-09-13 | 2006-03-08 | 北京中星微电子有限公司 | File distribution list file system read-write method and device |
| CN101051315A (en) * | 2006-04-07 | 2007-10-10 | 联发科技股份有限公司 | A method of storing files in a data storage device and data storage device thereof |
| CN101051318A (en) * | 2007-05-11 | 2007-10-10 | 北京中星微电子有限公司 | Method for cluster linking and track hunting magnetic disc data using file distribution table |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1744090A (en) * | 2005-09-13 | 2006-03-08 | 北京中星微电子有限公司 | File distribution list file system read-write method and device |
| CN101051315A (en) * | 2006-04-07 | 2007-10-10 | 联发科技股份有限公司 | A method of storing files in a data storage device and data storage device thereof |
| CN101051318A (en) * | 2007-05-11 | 2007-10-10 | 北京中星微电子有限公司 | Method for cluster linking and track hunting magnetic disc data using file distribution table |
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