CN1098498C - How to Backup and Restore Files with Long File Names on Your Computer - Google Patents

Abstract

A method for backing up and recovering long filenames of files in a computer comprises the steps of calling a computer input/output system, obtaining a file directory table from a partition area of a logic hard disk, and correspondingly dumping long filenames and short filenames in the file directory table into backup files with long filenames to complete backup operation; then, in the environment without supporting the long filename, the short filename in each directory and subdirectory is searched by the reverse process of preparing the long filename, then the corresponding long filename in the backup file is written back to the original file directory table, and the limitation that the DOS does not support the long filename is bypassed, thereby realizing the purpose of backup and recovery of the long filename.

Description

How to Backup and Restore Files with Long File Names on Your Computer

The invention relates to a method for backing up and restoring long filenames of files in a computer, in particular to a method for backing up and restoring long filenames in an environment that does not support long filenames (such as a DOS environment) when applied to a personal computer. method for the filename.

In Windows 95 (Windows 95) and its subsequent Windows computer operating system (Windows 9x) published by Microsoft Corporation, one of the improvements that is very useful to users is the ability to use long file names, which allows users to choose from file names. Freed from the limitation of using 8 characters for naming. However, previous computer operating systems (such as Win31, DOS, etc.) do not support files with long file names. In order to be compatible with DOS, the Windows 95 operating system generates a corresponding short file name for each long file name. So that in non-Windows 95 (that is, an environment that does not support long file names), the file content can also be accessed through the short file name. But even if Windows 95 itself is attached with the operating system of DOS7.0 version, if Windows 95 is not started, it still cannot generate long file names. Therefore, it is very necessary to generate long file names in the DOS environment that does not support long file names, such as backup and recovery of computer operating systems.

In the process of actually using the computer, it is inevitable that the operating system will be damaged. For users who use Windows 95, reinstalling the operating system is often a complicated but necessary process. If the user does not have Backup, it is necessary to reinstall the application software by reinstalling. The backup program provided by Microsoft is only used to back up files but not the system, so in order to avoid the inconvenience of reinstalling the system after the system is damaged, it is necessary to back up and restore the system. When Windows9x cannot start, and needs to utilize backup to restore the system, it will run into the problem that the long file name cannot be generated under the DOS environment. If the long file name in the system is not restored, Windows9x cannot start again, so , it is necessary to generate long file names in an environment other than Windows9x (that is, an environment that does not support long file names).

The object of the present invention is to provide a method capable of backing up and restoring long file names in a computer environment that does not support long file names.

Another object of the present invention is to provide a method for backing up and restoring long file names in an environment that does not support long file names, regardless of the language of the computer operating system.

Another object of the present invention is to provide a method for backing up and restoring long file names that has lower requirements on the operating system and can still be used when Windows cannot be started at all.

The object of the present invention is achieved in that it obtains the file directory table (FDT) from the partition (Partition) of the logical hard disk by calling the basic input output system (BIOS) of the computer, and then the long file in the file directory table Name item and short file name item correspond to dumping and storing a long file name backup file to complete the long file name backup operation; then in an environment that does not support long file name, first search for each Short file names in the directory, and then write back the corresponding long file names in the backup file to the original file directory table (FDT), bypassing the limitation that DOS does not support long file names, and realizing The purpose of backing up and restoring long filenames in a named environment.

According to the disclosed method of the present invention, owing to can carry out the backup and recovery of long file name under the situation that window operating system (Windows) can't start completely, promptly be irrelevant with the language version of operating system, for example: can be in Simplified Chinese Windows95 Backup and recovery of long file name files in traditional Windows95 will not cause file name code errors. As for other backup methods, they will not be able to solve the problem of file name code errors due to their dependence on Windows95 itself.

Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is the computer hardware structural diagram realizing the present invention;

Fig. 2 is a data structure diagram of a disk partition;

Fig. 3 is the operation flowchart of backing up long file name of the present invention;

Fig. 4 is the operation flowchart of the present invention recovery long file name;

Fig. 5 is the operation flowchart of the present invention generating long file name backup file under a certain directory;

Fig. 6 is the operation flowchart that the present invention utilizes long file name backup file to restore long file name in computer;

Fig. 7 is the flow chart of main steps of backup long file name of the present invention;

Fig. 8 is a partial flow chart among Fig. 7, shows to search in file directory table (FDT) and generate the detailed steps of long file name backup file;

Fig. 9 is the flow chart of main steps of the present invention recovering long file name;

Fig. 10 is a partial flow chart among Fig. 7, shows the detailed steps of searching and recovering the long file name in the file directory table (FDT);

Fig. 11 is the detailed step flow chart that searches for long file name in long file name backup file according to the method of the present invention;

Fig. 12 is a flow chart of detailed steps of writing the content of the long file name backup file into the file directory table according to the method of the present invention.

Please refer to Fig. 1 first, the method for backing up and restoring long filenames in an environment that does not support long filenames disclosed by the present invention is realized by performing in the following hardware structures, and these hardware structures include:

A micro-processing unit 10, used to execute the operation program disclosed by the present invention for backing up and restoring long file names;

A basic input and output system 20 (BIOS, Basic Input/Output System);

A hard disk 30 is used to store the operating system, application software or files of the computer and other data that can be utilized by the microprocessing unit 10;

An input unit 40, such as a keyboard, a mouse, a light pen or other devices with similar functions, for inputting data;

An output unit 50, such as a screen, a display, a liquid crystal display, a touch display or other devices with similar functions, is used to output the processing results of the micro-processing unit 10;

A random access memory module 60 for storing relevant processing data; and

A power supply device 70 is used to supply the electric energy required for the operation of the aforementioned components.

According to the method disclosed in the present invention, the backup and recovery of long file names are realized through the following two stages, including:

1. The backup long filename becomes a long filename backup file; and

2. Use the backup file with a long file name to perform the reverse process of backup, and complete the recovery of the long file name.

Before further detailing the detailed technical content of the above two stages, an explanation will be made on the knowledge about long file names and short file names in the process of implementing the technology of the present invention. · Disk data storage format

Disk (such as: hard disk, floppy disk) is one of the peripheral devices of the computer, and it is a kind of recording medium, which is used to store operating system, application program, digital data, analog data, etc.; whether it is a hard disk or The floppy disk must be "initialized" before it can be used. This initial process is called formatting (Formatting). Currently, in DOS and Windows environments, the format method of the disk can be "Formatting" provided by Microsoft Corporation. command, divide the disk into many sectors (Sector) and the track (Track) synthesized by the sector through the "Format" command; Data is written into the pre-established file allocation table (FAT, File Allocation Table) and file directory table (FDT, File Directory Table). Please refer to Fig. 2, it is a structural diagram of a disk partition (Partition), which includes a boot record, a first file configuration table, a second file configuration table, a file directory area, and a data recording area, and the aforementioned file directory area The data recording area is the composition of the so-called file directory table (FDT). Wherein the file directory area is made up of a plurality of file directory entries (including short filename directory entries and corresponding long filename directory entries) to provide information related to the data stored in the data recording area (such as; file name, additional filename, timestamp...etc).

In the aforementioned startup record, there is also a disk parameter block (DPB, Disc ParameterBlock, hereinafter referred to as DPB), and the structure of this DPB in the FAT16 and FAT32 systems is not exactly the same, and its contents are as [Table 1] and [Table 2].

The configuration of short file name directory items and long file name directory items in FDT is shown in [Table 3]. ·Structure of long file name item and short file name item

In Windows 95 (Windows95), a method for storing long filenames using directory entries in the 8.3 format (short filename format) is provided. Microsoft (Microsoft) calls the file system using this method a virtual file partition table (VFAT. Virtual File Allocation Table). Every long filename stored according to this file system has a corresponding 8.3 format alias. Long file names and short file names are stored together in a file directory table (FDT, File Directory Table, hereinafter referred to as FDT), and each FDT contains multiple file directory entries (including short file name directory entries and corresponding long file name directory entry), each long file name directory entry can store 13 characters in the long file name [the long file name is stored in the form of universal code (UNICODE), and each character occupies 2 bits (BYTE )], and in order to distinguish whether the directory entry in FDT is a long file name or a short file name, Wmdows95 sets the directory attribute bit of the long file name to "OF", and the "OF" attribute is an illegal file name under DOS, DOS This file name cannot be accessed, renamed or deleted, so such a long file name can be protected under DOS, and DOS can access files through its corresponding short file name.

For the format of the long file name directory entry and the short file name directory entry, please refer to [Table 4] and [Table 5] respectively.

The following is a long file name: RunOnceEx Log.txt, and the corresponding short file name is RUNONC~1.TXT. The storage form of the file in the computer: 1370: 04E0 42 2E 00 74 00 78 00 74-00 00 00 00 0F 00 D0 FF FF

B..t.x.t...1370:04fD FF FF FF FF FF FF FF FF FF FF 00 00 FF FF FF FF

... ... ... ... ... ... 1370: 0500 01 52 00 75 00 6E 00 4F-00 6E 00 0F 00 D0 63

00.R.u.n.O.n...c.1370: 0510 65 00 45 00 78 00 20 00-4c 00 00 00 6f 00 67 00 e.E.x..L...o.g.1370: 0520 52 55 4E 4F 4E 43 7E 0 80 2 54 5 2B 6D RUNONE～

  1TXT..+m1370: 0530 67 25 67 25 00 00 16 72-65 25 14 00 B3 45 00 00 g%g%…re

%...E..

in:

1370: The 32nd bit starting from 04e0 is: end item of long file name

1370: The 32nd bit starting from 0500 is: long file name item

1370: The 32nd bit starting from 0520 is: short file name directory entry

Windows can also determine whether the short file name has been modified in a non-Windows9x environment by calculating the checksum of the short file name and then comparing it with the checksum in the long file name.

Therefore, according to the technology disclosed in the present invention, as long as the long file name directory entry and the corresponding short file name directory entry in the file directory area are backed up together to form a long file name backup file, the long file can be restored in the future according to the desired The short file name in the disk directory of the first name, and then obtain the corresponding long file name directory entry in the long file name backup file, and perform the recovery operation of the long file name. ·The operation process of generating backup files with long file names

Please refer to Fig. 3, the present invention includes to the operation process that long file name is prepared:

1. According to the partition table (Partition Table), search for the first sector (i.e. disk parameter block, DPB, Disk Parameter Block) of the partition (Partition) of the hard disk 30;

2. The long file name item and the short file name item backup stored in the file directory table (FDT) in the partition are stored under the current directory, and become a long file name backup file;

3. Search down the file directory table (FDT) of the subdirectory;

4. The long file name item and the short file name item backup stored in the file directory table (FDT) of the subdirectory in the long file name backup file of the current subdirectory; and

5. Determine whether there are subdirectories that have not been backed up yet? If yes, return to step 4, and if no, end the backup operation.

Please refer to Figure 5. During the process of generating a backup file with a long file name, the same FDT may include multiple short file names that are not in the format of a long file name, as shown in the short file name 1 to short file in the figure. name 3, there will be no corresponding long file name to exist, and the short file name items of these short file name 1-short file name 3 will not have any use in the operation of restoring long file names in the future, so the present invention is in After storing the long file name items and short file name items contained in FDT together to generate a long file name backup file, the short file names that do not contain the corresponding long file name items in the long file name backup file will be removed , that is, to remove useless short file name information.

Continue referring to Fig. 7, it is the flow chart of main implementation steps of backup long file name of the present invention, and it comprises:

1. Start the backup;

2. Read the content of the disk parameter block (DPB) of the hard disk to be backed up, and obtain the identification code (FSID, File System ID) of the file system;

3. Determine the FSID, if it is FAT16, continue to the next step, if it is FAT32, then skip to step 6, if neither of the above two, then skip to step 9;

4. Calculate the location of the boot record table (BDT, Boot Directory Table);

5. Set the size of BDT (disk capacity/magnetic cluster);

6. Get the start of BDT;

7. Calculate the BDT starting position;

8. Search all file directory tables FDT, and generate a backup file with a long file name under the current search directory; and

9. End the backup operation.

In the backup process in Figure 7, firstly, according to the disk code (such as C:\) to be backed up in the partition table (Partition Table), look for the location of its root directory. As far as FAT16 is concerned, it is the first sector after FAT , as far as FAT32 is concerned, it is usually located in the second disk cluster, of course, the root directory location of FAT32 can also be obtained from DPB. After obtaining the root directory, you can perform a backup operation with long file names on the root directory and all subdirectories.

Aforesaid step 8 also comprises the following steps: (seeing Fig. 8)

1. Determine whether the long file name backup file generation operation in the current directory is over? If yes, skip to step 5, if no, continue to the next step;

2. Read a file directory entry and store it in the backup file with long file name in the current directory;

3. Determine whether the file directory item is the end item of the long file name? If yes, proceed to the next step, if no, return to step 1;

4. Back up and save as a backup file with a long file name located in the current directory, and then return to step 1;

5. Set the initial file directory item as the current directory;

6. Determine whether the operation of generating backup files with long file names in the current directory is over? If yes, then end the generation operation of the long file name backup file, if no, then continue to the next step;

7. Read a file directory entry and store it in the backup file with long file name in the current directory;

8. Determine whether the file directory item is a subdirectory? If yes, proceed to the next step, if no, return to step 6; and

9. Recursively process the next subdirectory, then return to step 6.

In the generation process shown in Figure 8, the method of searching for FDT and backing up and saving the long file name (LFN, Long File Name) is carried out by means of two searches. When searching for the first time, all sectors are analyzed and Save all long file name items and corresponding short file name items, and in the second search, analyze all subdirectories, perform a deep search, and save all long file name items and corresponding short file names in all subdirectories name item.

Since the present invention adopts a recursive processing method, it is calculated that subdirectories with a depth of 40 levels can be processed by using this method. If you do not keep the current directory when recursing, you can increase the recursive depth to more than 80 levels, which is not only applicable to the file system of FAT16, but also applicable to the file system of FAT32. ·The operation process of restoring long file names

Please refer to Fig. 4, it is the operation process that the present invention restores long file name according to long file name backup file, and the step of restoring is exactly the inverse process of backing up operation to long file name basically, and it comprises:

1. According to the partition table (Partition Table), search for the first sector (i.e. disk parameter block, DPB, Disk Parameter Block) of the partition (Partition) of the hard disk 30;

2. According to all the short file name items contained in the file directory table (FDT) in the partition, find the corresponding content (including the short file name item and the corresponding long file name item) in the long file name backup file, and then here In the file directory table (FDT) under the directory, the corresponding short file name item is replaced with the corresponding short file name item and the corresponding long file name item in the backup file; and become a new file directory item (as shown in Figure 6 Show);

3. Search down the file directory table (FDT) of the subdirectory;

4. According to all the short file name items contained in the file directory table (FDT) under the subdirectory, find the corresponding content (comprising the short file name item and the corresponding long file name item) in the long file name backup file, and then in In the file directory table (FDT) under this subdirectory, replace the corresponding short file name item with the corresponding short file name item and corresponding long file name item in the backup file, and become a new file directory item (as shown in the figure 4); and

5. Determine whether there are subdirectories that have not completed the recovery operation of long file name items? If yes, return to step 4, and if no, end the recovery operation.

Continue referring to Fig. 9, it is the flow chart of main implementation steps of the present invention to restore long file name, and it includes:

1. Start the recovery operation;

2. Read the content of the file directory area of FDT in the hard disk to be recovered;

3. Find the long file name backup file in the current directory;

4. Determine whether to find a long file name backup file? If yes, continue to the next step, if no, skip to step 9;

5. Restoring long file names is based on all short file name items contained in the file directory table (FDT) in the current directory, and finds the corresponding content in the long file name backup file (including short file name items and corresponding long file name items) item), then in the file directory table (FDT) under this directory, replace the corresponding short file name item with the corresponding short file name item and the corresponding long file name item in the aforementioned backup file, and become a new file directory entry;

6. Find the subdirectories of the current directory;

7. Determine whether there are subdirectories? If yes, proceed to the next step, if no, skip to step 9;

8. Restore the long file name under the current subdirectory, and then return to step 6 to recursively process other subdirectories; and

9. End the restore operation.

In the backup process of Figure 9, the location of the root directory is also searched according to the disk code (such as C:\) to be backed up in the partition table (Partition Table). As far as FAT16 is concerned, it is the first one after FAT Sectors, as far as FAT32 is concerned, are usually located in the second magnetic cluster, and of course the root directory location of FAT32 can also be obtained from DPB. After the root directory is obtained, the short file name items in the root directory and all subdirectories can be converted into a new file directory item including the short file name item and the corresponding long file name item, and the recovery operation of the long file name is completed.

As shown in Figure 10, the detailed steps for recovering long file names in the aforementioned Figure 9 include:

1. Read a short filename entry from the current directory on the disk;

2. judge whether to end the recovery of the long file name, if yes, then end the long file name recovery operation of this directory, if not, continue to the next step;

3. Look for the long file name backup file in the current directory;

4. Determine whether to find a long file name backup file? If yes, proceed to the next step, if no, return to step 1;

5. Information about storing short file name items;

6. Delete the short file name item;

7. Move in items containing the same short filename and corresponding long filename entries from the long filename backup file; and

8. Modify the first magnetic group of the file pointed to by the short file name item to make it consistent with the short file name item just deleted, and then return to step 1.

In the processing flow in Fig. 10, obtain a short file name from the file directory area, then search for its corresponding long file name item in the long file backup file under the same directory (the step flow is shown in Fig. 11) , then delete the short file name in the file directory area if found, then add the short file name item in the long file backup file together with the corresponding long file name item in the file directory area (its step process is as shown in Figure 12 ), and then modify the first disk cluster of the file pointed to by the short file name item to make it consistent with the short file name item just deleted.

In the following, an example shown in Table 6 is used to illustrate the long file names in the same directory, the content before backup, after the system is destroyed and after utilizing the method of the present invention to recover.

And in the result of this embodiment, it can be seen that the present invention can restore the only remaining short file name to the situation before the backup after the system is destroyed. Location content 0B-0C The number of characters in each sector (here is 0x0002, which is 512) 0D The number of magnetic sectors in each magnetic cluster (the number is determined by the size of the partition) 0E-0F Reserved sector (0x0100) 10 Number of FAT (0x02) 11-12 The maximum value of the file directory entry (0x0002 here) 13-14 Total number of magnetic areas (here is 0 when more than 65535) 15 Media descriptor (0xf8) 16-17 Number of sectors per FAT 18-19 Number of sectors per track 1A-1B Number of heads 1C-1D Number of hidden sectors (does not affect the result) 20-23 The total number of magnetic sectors when the 13-14 characters are 0 twenty four Physical drive letter (0x80 for the first block, 0x81 for the second...) 25 reserve 26 The characteristic character of the extended boot record (0x29) 27-2A Disk serial number (randomly generated) 2B-35 Label (11 characters in total) 36-3D File system type (ie FAT16)

[Table 1], the structure of FAT16 Location content 0B-0C The number of characters in each sector (here is 0x0002, which is 512) 0D The number of magnetic sectors in each magnetic cluster (the number is determined by the size of the partition) 0E-0F Reserved sector (0x0100) 10 Number of FAT (0x02) 11-12 The maximum value of file directory entries (0 here) 13-14 Total number of sectors (0 here) 15 Media descriptor (0xf8) 16-17 Number of sectors per FAT (0 here) 18-19 Number of sectors per track 1A-1B Number of heads 1C-1F Number of hidden sectors (does not affect the result) 20-23 The total number of magnetic sectors when the 13-14 characters are 0 24-27 Total number of sectors 28-29 File System Ver(major) (0 is enough) 2A-2B File System Ver(minor) (0 is enough) 2C-2D File directory header cluster number (0x02000) 2E-2F The high bit of the file directory header cluster number 30-31 FSINFO Sector number (0xffff if none) 32-33 Backup Boot Sector (0xffff if none) 34-3F reserve 40 Physical drive letter (0x80 for the first block, 0x81 for the second...) 41 reserve 42 The characteristic character of the extended boot record (0×29) 43-46 Disk serial number (randomly generated) 47-51 Label (11 characters in total) 52-59 File system type (i.e. FAT32)

[Table 2] The structure of FAT32 Long file name directory entry (including end flag) long file name directory entry ... ... ... long file name directory entry short file name directory entry

[Table 3] Configuration of long/short file name directory items in FDT displacement length describe 00H 1BYTE BIT0~5 is the position of the directory entry relative to the short file name, and BIT6 is the end sign 01H 10BYTE Sentences containing 5 characters for long filenames 0BH 1BYTE attribute, the long file name is 0FH 0CH 1BYTE reserve 0DH 1BYTE short filename checksum 0EH 12BYTE 6 characters containing the long filename 1AH 1WORD (word group) Reserved (constantly 0) 1CH 4BYTE 2 characters containing the long filename

[Table 4] Format of directory entries with long file names displacement length describe 00H 8BYTE short filename part 08H 3BYTE The extended filename part of the short filename 0BH 1BYTE file properties 0CH 1 WORD reserve 0EH 1 WORD last access date 10H 1 WORD last update time 12H 1 WORD last update date 14H 1 WORD The upper 2 bits of the FAT32 start magnetic cluster 16H 1 WORD last update time 18H 1 WORD last update date 1AH 1 WORD The lower 2 bits of the FAT16 initial magnetic cluster or the FAT32 initial magnetic cluster 1CH 1 WORD file size

[Table 5] The format of the short file name directory item The directory with the above three long file name files before backup: 1370: 0460 42 4C 41 43 4B 54 7E 31-42 4D 50 20 00 0F 2B 6D BLACKT-1BMP.. +m1370: 0470 67 25 67 25 00 00 20 A0-AB 24 0D 00 B6 00 00 00 g%g%.. ..$...1370: 0480 42 6E 00 20 00 53 00 61-00 76 00 0F 00 6B 65 00 Bn..S.a.v..ke.1370:0490 72 00 2E 00 53 00 43 00-52 00 00 00 00 00 FF FF r...S.C.R......1370:04A0 01 43 00 68 00 61 00 6E-00 6E 00 0F 00 6B 65 00 .C.h.a.n.n...ke.1370: 04B0 6C 00 20 00 53 00 63 00-72 00 00 00 65 00 65 00 l..S.c.r300e.e... 43 48 41 4E 4E 45 7E 31-53 43 52 20 00 10 2B 6D CHANNE～1SCR..+m1370: 04D0 67 25 67 25 00 00 20 A0-AB 24 0E 00 40 48 01 00 g%g%.. [email protected]：04E0 42 2E 00 74 00 78 00 74-00 00 00 0F 00 D0 FF FF B..t.x.t........1370：04F0 FF FF FF FF FF FF FF FF -FF FF 00 00 FF FF FF FF ... 1370:0500 01 52 00 75 00 6E 00 4F-00 6E 00 0F 00 D0 63 00 .R.u.n.O.n... c.1370: 0510 65 00 45 00 78 00 20 00-4C 00 00 00 6F 00 67 00 e.E.x. .L...o.g.1370: 0520 52 55 4E 4F 4E 43 7E 31-54 58 54 54 20 UNB 6 ~1TXT..+m1370: 0530 67 25 67 25 00 00 16 72-65 25 14 00 B3 45 00 00 g%g%...re%...E..1370: 0540 42 69 00 66 00 00 00 FF-FF FF FF 0F 00 23 FF FF Bi.f..........#..1370:0550 FF FF FF FF FF FF FF FF-FF FF 00 00 FF FF FF FF ..... ..........1370: 0560 01 45 00 78 00 69 00 74-00 20 00 0F 00 23 54 00 .E.x.i.t....#T.1370: 0570 6F 00 20 00 44 00 6F 00 -73 00 00 00 2E 00 70 00 o..D.o.s......p1370: 0580 45 58 49 54 54 4F 7E 31-50 49 46 20 00 1E 2B 6D EX1TTO～1PIF..+m1370: 0590 67 25 67 25 00 00 EC 49-66 25 16 00 C7 03 00 00 g%g%...1f%...This directory after the Windows95 system is destroyed: 1370:0460 42 4C 41 43 4E 54 7E 31-42 4D 50 20 00 0F 2B 6D BLACKT～1BMP..+m1370: 0470 67 25 67 25 00 00 20 A0-AB 24 0D 00 B6 00 00 00 g%g%.. ..S......1370: 0480 43 48 41 4E 4E 45 7E 31-53 43 52 20 00 10 2B 6D CHANNE～1SCR..+m1370: 0490 67 25 67 25 00 00 20 A0-AB 24 0E 00 40 48 01％g00％.g [email protected]：04AB 52 55 4E 4F 4E 43 7E 31-54 58 54 20 00 15 2B 6D RUNONC～ITXT..+m1370：04B0 67 25 67 25 00 00 16 72-65 25 14 00 B3 45 00 00 g%g%...re%...E..1370：04C0 45 58 49 54 54 4F 7E 31-50 49 46 20 00 1E 2B 6D EXITTO～1PIF..+m1370：04D0 67 25 67 25 00 00 EC 49-66 25 16 00 C7 03 00 00 g%g%...If%...the same directory 1370:0000 after recovery using the present invention 42 4C 41 43 4B 54 7E 31-42 4D 50 20 00 0F 2B 6D BLACKT～1BMP..+m1370: 0010 67 25 67 25 00 00 20 A0-AB 24 0D 00 B6 00 00 00 g%g%.. ..S.... ..1370: 0020 42 6E 00 20 00 53 00 61-00 76 00 0F 00 6B 65 00 Bn..S.a.v...ke.1370: 0030 72 00 2E 00 53 00 43 00-52 00 00 00FF 00 0 r...S.C.R....1370: 0040 01 43 00 68 00 61 00 6E-00 6E 00 0F 00 6B 65 00 .C.h.a.n.n...ke.1370: 0050 6C 00 20 00 53 00 63 00-72 00 00 00 65 00 65 00 l..S.c.r...e.e.1370: 0D60 43 48 41 4E 4E 45 7E 31-53 43 52 20 00 10 2B 6D CHANNE～1SCR..+m1370: 0070 0 0 25 0 67 A0-AB 24 0E 00 40 48 01 00 g%g%.. [email protected]:0080 42 2E 00 74 00 78 00 74-00 00 00 0F 00 D0 FF FF B..t. .x.t........1370:0090 FF FF FF FF FF FF FF FF-FF FF 00 00 FF FF FF FF ..........1370:00A0 01 52 00 75 00 6E 00 4F-00 6E 00 0F 00 D0 63 00 .R.u.n.O.n....c.1370: 00B0 65 00 45 00 78 00 20 00-4C 00 00 00 6F 00 67 00 e.E.x..13o... ：00C0 52 55 4E 4F 4E 43 7E 31-54 58 54 20 00 15 2B 6D RUNONC～1TXT..+m1370：00D0 67 25 67 25 00 00 16 72-65 25 14 00 B3 0 45 g％0% ..re%...E..1370: 00E0 42 69 00 66 00 00 00 FF-FF FF FF 0F 00 23 FF FF Bi.f......#..1370: 00F0 FF FF FF FF FF FF FF FF-FF FF 00 00 FF FF FF FF ..........1370:0100 01 45 00 78 00 69 00 74-00 20 00 0F 00 23 54 00 .E..x.i.t. ...#T. .1370: 0110 6F 00 20 00 44 00 6F 00-73 00 00 0C 2E 00 70 00 o..D.o.s.....p.1370: 0120 45 58 49 54 54 4F 7E 31-50 49 46 20 00 IE 2B 6D EXITTO～1PIF..+m1370: 0130 67 26 67 25 00 00 EC 49-66 25 16 00 C7 03 00 00 g%g%...If%.. ....

【Table 6】

The advantage of the inventive method is:

1. It is possible to back up and restore long file names in a computer environment that does not support long file names.

2. It is not affected by the language of the computer operating system, and it can still backup and restore long file names in an environment that does not support long file names.

3. The requirements for the operating system are low, and the backup and recovery operations of long file names can still be performed when Windows cannot be started at all.

Claims (7)

1. A method for backing up and restoring the long file name of a file in a computer, which is applied in a personal computer, and used for backing up and restoring the long file name of a file in an environment that does not support the long file name, is characterized in that, Including: 1) Obtain a file directory table (FDT) from the partition (Partition) of the logical disk, and then dump a long file name item and a short file name item in the file directory table into a file containing the short file name. a filename entry and a corresponding long filename backup file for that long filename entry; and 2) With the reverse process of backing up the long file name, search for each short file name in the file directory table and file subdirectory table, and then write back the corresponding long file name in the backup file to the original file directory table (FDT). 2. the method for backing up and recovering the long file name of file in computer as claimed in claim 1, is characterized in that, backing up this long file name backup file is realized by following steps: 1) Find the disk parameter block (DPB, Disk Parameter Block) of the partition (Partition) of the disk according to the partition table (Partition Table) of the disk; 2) a long file name item and a short file name item backup stored in the file directory table (FDT) in the partition are stored under the current directory, and become a long file name backup file; 3) Search down the file directory table (FDT) of the subdirectory; 4) a long file name item and a short file name item contained in the file directory table (FDT) of the subdirectory are backed up and stored in the long file name backup file of the current subdirectory; and 5) Determine whether there are subdirectories that have not been backed up yet? If yes, return to step 4, and if no, end the backup operation. 3. the method for backing up and recovering the long file name of file in computer as claimed in claim 1, is characterized in that, the method for recovering this long file name backup file comprises: 1) Find the disk parameter block (DPB, Disk Parameter Block) of the partition (Partition) of the disk according to the partition table (Partition Table); 2) According to all the short file name items contained in a file directory table (FDT) in the partition, find the short file name item corresponding to the short file name item and the corresponding short file name item in the long file name backup file. Long file name item, then in the file directory table (FDT) under this directory, the corresponding short file name item is replaced with the corresponding short file name item and the corresponding long file name item in the backup file, and become a new file directory entry; 3) Search down the file directory table (FDT) of the subdirectory; 4) According to all the short file name items contained in the file directory table (FDT) under the subdirectory, find the corresponding content in the long file name backup file, and then in the file directory table (FDT) under the subdirectory Replace the corresponding short file name item with the corresponding short file name item and the corresponding long file name item in the backup file to become a new file directory item; and 5) Determine whether there are subdirectories that have not yet completed the recovery operation of the long file name item? If yes, return to step 4, and if no, end the backup operation. 4. the method for backing up and recovering the long file name of file in computer as claimed in claim 3, it is characterized in that, said corresponding content in this long file name backup file in this step includes a short file name item with the corresponding long filename entry. 5. A method for backing up a long file name of a file in a computer environment that does not support a long file name, characterized in that it includes: 1) Start the backup; 2) read the content of the disk parameter block (DPB) of the hard disk to be backed up, obtain the identification code (FSID, File System ID) of the file system; 3) Determine the FSID, if it is FAT16, then continue to the next step, if it is FAT32, then skip to step 6, if neither of the above two, then skip to step 9; 4) Calculate the position of the boot record table (BDT, Boot Directory Table); 5) Set the size of BDT (disk capacity/magnetic cluster); 6) Get the start of BDT; 7) Calculate the BDT starting position; 8) Search all file directory tables (FDT), and generate a backup file with a long file name under the current search directory; and 9) End the backup operation. 6. the method for backing up and recovering the long file name of file in computer as claimed in claim 5, is characterized in that, this step 8 also comprises: 1) Determine whether the long file name backup file generation operation in the current directory is over? If yes, skip to step 5, if no, continue to the next step; 2) read a file directory entry and save it into a backup file with a long file name under the current directory; 3) Judging whether the file directory item is the end item of the long file name? If yes, proceed to the next step, if no, return to step); 4) back up and save into a long file name backup file located in the current directory, then return to step 1; 5) Set the initial file directory item as the current directory; 6) Judging whether the generation operation of all backup files with long file names in the current directory is over? If yes, then end the generation operation of the long file name backup file, if no, then continue to the next step; 7) read a file directory item and store it in the backup file with long file name under the current directory; 8) Determine whether the file directory item is a subdirectory? If yes, proceed to the next step, if no, return to step 6; and 9) Recursively process the next subdirectory, then return to step 6. 7. The method for backing up and restoring long filenames of files in a computer according to claim 6, wherein the file directory entry includes a short filename entry and a corresponding long filename entry.

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