JP2000242534A - Indirect file access method, information processing apparatus for implementing the method, and recording medium recording indirect file access processing program - Google Patents

Abstract

(57) [Summary] [Object] An information processing apparatus having a file system in which the number of characters and the character set that can be used as a file name are restricted, the restriction on the file name is efficiently released. An information processing apparatus stores a user file name storage table storing user file names having no restrictions on the number of characters and character sets to be used, and converting the user file names into system file names having restrictions on the number of characters and character sets. It comprises a system file name conversion means for conversion, a file system access means for accessing the file system 11 using the converted system file name, and the like. When searching for an existing file, the user file name 2 is converted into a system file name 9 including the storage location information where the user file name 2 is stored in the user file name storage table 8, and the file system access means converts the file Access the system 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an information processing apparatus in which the number of characters that can be used as a file name is limited and an information processing apparatus in which a character set that can be used as a file name is restricted. File access method capable of removing the restrictions and restrictions of the above and using a user file name using a variety of character sets with a sufficiently long number of characters, an information processing apparatus for implementing the method, and recording an indirect file access processing program Related to a recorded medium.

[0002]

2. Description of the Related Art In general, there is a limit on the length of a file that can be used as a file name that can be used in a small-scale information processing apparatus, and only a file name that falls within the limit can be used. In addition, the character set that can be used as a file name is limited to alphabetic characters and numerals, and there is a restriction that alphabetic characters cannot be distinguished from uppercase and lowercase. As a means of avoiding the restriction on the file name length of this file system, a method of obtaining a hash value using the original file name as a key and using this value as a fixed-length converted file name instead of the original file name However, efficient file management was difficult. Similarly, as a means for avoiding the restriction on the length of the file name, a method of managing the area for storing the file management information by dividing it into a fixed-length file name storage area and a continuation information area for storing the part beyond the fixed-length file name storage area However, efficient file management was also difficult in this case.

[0003]

If there is a restriction on the character set that can be used as the name of a file that can be used in the information processing apparatus, a file using characters beyond the range of the character set is created. It is not possible.
Further, when the number of characters that can be used as a file name is limited, only a file name that falls within the limit can be used, and a file having a different portion beyond that is processed as the same name.

The method of using the hash value of the original file name as a converted file name in order to extend the restriction on the length of the file name and using it as a substitute for the original file is complicated in the calculation of the hash value, and the calculated hash value In order to avoid the collision of the converted file names when the files collide with each other, more complicated management is required, and efficient file management is difficult. Regarding the method of managing the area for storing file management information by dividing it into a fixed-length file name storage area and a continuation information area that stores the area beyond the fixed-length file name, if there is a file whose fixed-length file name part conflicts In addition, it was necessary to separately manage the file name and the complicated file name part beyond the fixed length, and it was difficult to manage the file efficiently.

According to the present invention, the existing file system provided in the information processing apparatus is not modified and used as various restrictions of the conventional file system, such as restrictions on available character sets and file names. To provide an indirect file access method capable of efficiently removing restrictions such as the number of characters that can be performed and greatly improving the user interface, an information processing apparatus for implementing the method, and a recording medium recording an indirect file access program. is there.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an information processing apparatus having a character set which can be used as a file name and a file system which has a limitation on a file length which can be used as a file name. Prepare a user file name storage table that stores the character set that can be used and the file name with no restriction on the file name length. When accessing the file, search the table and find the table that stores the file name. The above restrictions are removed by converting the actual file name based on the positional information in the file.

According to a first aspect of the present invention, in an indirect file access method in a file system for managing files using file names, a user file name storage means for storing a user file name used by a user or a program is prepared. An arbitrary user file name used by the program is converted into a system file name including storage location information where the user file name is stored in the user file name storage means, and the converted system file name is used as the file name. Accessing a file system, and extracting storage location information in the user file name storage means from a system file name;
The present invention also relates to an indirect file access method, wherein a user file name is converted by referring to the user file name storage means.

According to a second aspect of the present invention, there is provided an information processing apparatus having a file system for managing files using file names, wherein a user file name storage means for storing user file names used by users and programs; For any user file name used,
A system file name conversion unit that converts the user file name into a system file name including storage location information in which the user file name is stored in the user file name storage unit; and a system file name converted by the system file name conversion unit. File system access means for accessing the file system, and user file name conversion for extracting storage location information in the user file name storage means from a system file name and referring to the user file name storage means for conversion to a user file name And an information processing apparatus comprising:

According to a third aspect of the present invention, there is provided a file system for managing a file using a file name, there is a restriction on a character set that can be used as a file name in the file system, and a user or a user used by a program is required. In an information processing apparatus capable of using a character set other than a character set that can be used as a file name in the file system as the file name, the user file name is stored in association with a system file name used by the file system. A user file name storage unit, a system file name conversion unit for converting the user file name into a system file name in accordance with a character set restriction that can be used as the system file name, and a system file name conversion unit File system access means for accessing the file system using a system file name as a file name; and user file name conversion means for converting a system file name to a user file name by referring to the user file name storage means. And an information processing apparatus.

According to a fourth aspect of the present invention, in the third aspect of the invention, the system file name conversion means stores the user file name in the user file name storage means for an arbitrary user file name. The user file name conversion means extracts the storage location information in the user file name storage means from the system file name, and refers to the user file name storage means to convert the user file name into a user file name. The present invention relates to an information processing device characterized by converting a name into a name.

According to a fifth aspect of the present invention, in the third or fourth aspect of the invention, the system file name conversion means comprises:
When the user file name complies with a character set restriction that can be used as a file name in the file system, the information processing apparatus uses the user file name as it is as a system file name.

According to a sixth aspect of the present invention, there is provided a file system for managing a file using a file name, the length of the file name in the file system is restricted, and the file name is used as a user file name used by a user or a program. In an information processing apparatus capable of using a file name having a length exceeding a file name length limit in a file system, a user file storing the user file name in association with a system file name used by the file system Name storage means and, for an arbitrary user file name, a system file name including storage location information in which the user file name is stored in the user file name storage means; System file name conversion means for converting according to File system access means for accessing the file system using the system file name converted by the system file name conversion means as a file name; storage location information in the user file name storage means from the system file name; And a user file name conversion means for converting the user file name into a user file name by referring to the means.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the system file name conversion means is configured to set the length of the user file name according to a limit on a length that can be used as a file name in the file system. If the user file name exists, the user file name is used as it is as a system file name.

According to an eighth aspect of the present invention, in the second aspect of the invention, a specific character string is included at a specific position of the system file name converted by the system file name conversion means, When a specific character string is included in a specific position of a system file name processed by the user file name conversion means, the system file name is directly used as the user file name.

According to a ninth aspect of the present invention, there is provided a user file name storing function for storing a user file name used by a user or a program in a computer, and an arbitrary user or program used by the user or the program using the user file name storing function. A system file name conversion function for converting a user file name into a system file name including storage location information where the user file name is stored, and a system file name converted by using the system file name conversion function. A user file name conversion function for accessing a file system, extracting storage location information from the system file name, and converting it to a user file name;
The present invention relates to a recording medium on which a program for executing the program is recorded.

(Operation) According to the present invention, there is no restriction on the character set that can be used as a file name that can be used in the file system of the information processing apparatus, and characters including Japanese characters can be used as the file name. Furthermore, it is possible to virtually eliminate restrictions on the length of a name that can be given to a file, and it is possible to give a file name of an arbitrary length.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the relationship between a file system expansion device and an information processing device for implementing the indirect file access method, and the relationship between a user and a program. Reference numeral 1 denotes a user or a program on an information processing apparatus. The user file name before conversion 2 used in this part has no restriction on the character set to be used, and there is no restriction on the length of characters that can be used as a file name. File name. The file system expansion device 3 includes a file search processing unit 4,
It comprises a file creation processing unit 5, a file deletion processing unit 6, a free entry management processing unit 7, and a file name storage table 8. The user file name 2 before conversion is converted by the file system expansion device 3 into a system file name 9 after conversion, and there are restrictions on the character set that can be used for the file name and the length of the file name. The information is input to a certain information processing apparatus 10.

(Embodiment of User File Name Storage Table) FIG. 2 shows an embodiment of the user file name storage table 8. In the case of FIG. 2, there are file storage tables 1 to Z as entries, which indicate that a total of Z files exist. The file name that can be used by the information processing apparatus 10 in this embodiment can be used in a character set of 36 characters including uppercase alphabets and numerical values, and a suffix can be added as a file name. It must be preceded by a comma “.”. Also,
Regarding the length of the file name, it is assumed that the part before the suffix is restricted to eight characters and the suffix part is restricted to three characters.

Each entry has an entry index 12, a used / unused flag 13, a pre-conversion file name 1
4, free entry list 15. The used / unused flag 13 is a flag indicating whether or not this entry is used. For example, if this value is 1, it indicates that the entry is used, and if this value is 0, it is unused. Indicates an entry. The pre-conversion file name 14 is an area for storing a pre-conversion user file name 2 in which restrictions on usable character sets are removed and restrictions on the number of characters that can be used as file names are extended. In this case, the length of the file name is 128 characters at the maximum, and the restriction is greatly reduced. The size of this area is set to such a size that practically there is no restriction on the length of the file name. The next free entry list 15 has a function of linking unused entries among entries, and is for efficiently reusing empty entries. In the case of FIG. 2, the entry of the entry index 3 is a free entry, the index of the next free entry is 5, and the index of the next free entry is X. For each entry of the user file name storage table 8 described above, the system file name corresponding to the user file name stored therein is based on positional information in the table. This name can be, for example, an index value of the file name storage table. In that case, the system file name of index 4 is 00000004. 00000004 is a character string in which the index value 4 is expressed by eight characters. Also, a special suffix is added to this file to indicate that the file name has been converted, for example, 00000004. If a name such as CNV is used, it can be seen from the suffix that the file name is a converted file.

(Embodiment for Searching for Existing File) FIG. 3 is a flowchart showing a process for searching for an existing file. A process for searching for an existing file will be described with reference to FIG. 2 and a flowchart of FIG. The user file name 2 before conversion specified by the program is input to the file system expansion device 3, where it is converted by the file search processing unit 4 into the name of an actual file used in the file system 11. This process starts by extracting the contents of the first entry of the user file name storage table 8 (S1). At this time, the index of the user file name storage table 8 is stored (S2). Next, use /
The unused flag 13 is extracted (S3), and it is checked whether this entry is currently being used (S4). If it is not used, it is checked whether it is the last entry in the user file name storage table 8 (S
5) If it is the last entry, the file to be searched does not exist in the user file name storage table 8, and the process ends. If it is not the last entry in step 5, the content of the next entry of the user file name storage table 8 is fetched (S6), and the index of the storage table stored at this time is incremented (S7). Return. If the entry is being used in the process of step 4, the pre-conversion file name 14 is extracted from the user file name storage table 8 (S8), and it is checked whether or not the file name is being searched. (S9). If the file names are different, the processing is continued from the processing in step 5 described above. If the file names are the same, it is assumed that the converted file name 9 of the search file is a file whose name is the index of this entry (S10).

(Embodiment for Creating a New File) FIG. 4 shows a configuration of a user file name storage table 8 for explaining a process for creating a new file, and FIG. It is a flowchart shown. Processing for creating a new file will be described with reference to FIGS. 4 and 5. First, as shown in the flowchart of FIG. 5, an existing file is searched to check whether a file to be created already exists (S21), and it is checked whether a file having the same name exists (S22). Here, if a file with the same name exists, it means that a file with the same name already exists, so that the creation of a new file is failed. If a file with the same name does not exist in step 22,
It is checked whether a free entry list exists by referring to the free entry list 15 (S23). If there is no free entry, it means that all entries in the user file name storage table 8 are currently in use, and it is necessary to expand the table size of the user file name storage table 8 itself. This extension is performed by adding one entry to the end of the user file name storage table 8 (S2).
4). Use for new entries created in this way /
The unused flag 13 is set (S25), and a newly created file name is registered in the area of the pre-conversion file name 14 (S26). Since the converted file name is the index number of the new entry, a file is created with the converted file name (S30).

If there is a free entry in step 23, it is determined that there is an entry which was once used but became free due to the deletion of the file and became unused. In the case of FIG. 2, such entries are entries such as index 3, index 5, index X. This entry is indicated by the head 16 of the free list. In the case of FIG. 2, entry 3 is the first entry. Reuse this entry for the newly created file. First, the use / unused flag 13 is set (S27), and a setting indicating that this entry is being used is made. Next, a file name to be newly created is registered in the file name before conversion 14 (S28), and the head 16 of the free list is corrected to the entry 5 following the entry of the index 3 (S29). The entry 3 secured in this manner becomes the converted file name of the newly created file (S30).

(Embodiment for Deleting an Existing File) FIG. 6 shows the configuration of a file name storage table 8 for explaining a process for deleting an existing file.
FIG. 7 is a flowchart showing the processing. The process for deleting an existing file will be described with reference to the flowcharts of FIGS. First, a process of searching for an existing file is performed (S41), and it is checked whether a file to be deleted is registered in the user file name storage table 8 (S42). If it is not registered in the file name storage table 8, there is no file to be deleted, and the process ends. If it is registered in the file name storage table 8, the index of the file to be deleted in the user file name storage table 8 and the converted file name can be found by the processing of step 41. In order to enable the entry in the user file name storage table 8 to be reused, the used / unused flag 13 is reset (S43), and the value of the free entry list 15 of the entry is set to the value of the head 16 of the free list ( S44), the value of the head 16 of the free entry points to the entry (S45). After that, the file is deleted with the converted file (S46).

FIG. 8 shows an example in which the character set used is within the restrictions of the character set that can be used in the file system and the file name need not be converted. 9 is a flowchart illustrating a process in a case where a set falls within the restrictions of a character set that can be used in the file system 11 and file name conversion need not be performed. If the character set used in the user file name input by the user or the program satisfies the restrictions on the character set that can be used in the file system 11 of the information processing device 10, the user file name is stored via the user file name storage table 8. Without inputting the file name directly to the information processing apparatus, it is possible to avoid having to convert the file name.
In this case, as shown in FIG. 8, first, whether the character set used in the user file name 2 input by the user or the program is composed only of the character set that can be used in the information processing apparatus. Is determined. If the file name is composed of only available character sets, the file search processing, the file creation processing, the file deletion processing, and the free entry management processing via the user file name storage table 8 are directly performed. File processing. If the file is composed of a character set including unusable characters, file processing for converting the file name is performed via the user file name storage table 8.

FIG. 9 shows an embodiment in which a specific character string is used at a specific position of a file name and the file name is not converted. FIG. 9 shows a specific character string used at a specific position of the file name. 10 is a flowchart showing a process performed when a file name is not converted. When a specific character string is used at a specific position in a user file name 2 input by a user or a program, the file name is directly input to the information processing apparatus without performing the file conversion as described above. It is also possible to avoid having to convert the file name with. As an embodiment, when a specific character string (for example, raw) is specified as a suffix of a user file name as shown in FIG. 9, file search processing, file creation processing, and file deletion via the user file name storage table 8 are performed. Direct file processing without performing processing and free entry management processing.

(Embodiment of Recording Medium Recording Indirect File Access Processing Program) The indirect file access method described in each of the above embodiments is implemented by a program executed by an information processing apparatus comprising the system shown in FIG. Is achieved. The program that executes the indirect file access process includes a user file name storage function that stores a user or a user file name used by the program, and an arbitrary user that the user or the program uses by using the user file name storage function. Using a system file name conversion function to convert a file name to a system file name including storage location information in which the user file name is stored, using the system file name conversion function,
A program for accessing a file system using the converted system file name as a file name, extracting storage location information from the system file name, and performing a user file name conversion function of converting the file name into a user file name, which is read by a computer. It is stored on a possible recording medium. This recording medium may be a program medium configured to be separable from the main body, or may be a storage unit itself provided in the main body.

The program medium is a tape system such as a magnetic tape or a cassette tape, a floppy (registered trademark).
Magnetic disk and CD-R such as disk and hard disk
Optical discs such as OM, MO, MD, DVD, etc., cards such as IC cards and optical cards, or mask ROMs, EPROMs, EEPROMs, flash ROs
It may be a medium that solidly stores a program including a semiconductor memory such as an M.

When the information processing apparatus is provided with communication means capable of connecting to an external communication network,
It may be a medium that carries the program fluidly such that the program is downloaded from a communication network via this communication means. When downloading a program from a communication network in this manner, the download program is stored in the main device in advance, or
Alternatively, it may be installed from another recording medium. Note that the content stored in the recording medium is not limited to a program, but may be data.

[0029]

As described above, according to the present invention, a character set that can be used in an information processing apparatus using a file system that has restrictions on character sets that can be used as file names and restrictions on the length of file names There is no restriction on the file name, characters including Japanese characters can be used as file names, and there is virtually no restriction on the length of names that can be given to files, and file names of arbitrary length can be given. Become. Further, the restriction on the file name can be efficiently released with a simple hardware and software configuration without changing the file system included in the information processing apparatus.

[Brief description of the drawings]

FIG. 1 is a diagram showing a relationship between a file system expansion device and an information processing device for implementing an indirect file access method, and a relationship between a user and a program.

FIG. 2 is a diagram showing a structure of a user file name storage table.

FIG. 3 is a flowchart for explaining a process when searching for an existing file.

FIG. 4 is a diagram showing a structure of a user file name storage table for explaining a process when a new file is created.

FIG. 5 is a flowchart illustrating a process for creating a new file.

FIG. 6 is a diagram showing a structure of a user file name storage table for explaining a process when an existing file is deleted.

FIG. 7 is a flowchart illustrating a process for deleting an existing file.

FIG. 8 shows that the character set used is within the restrictions of the character set that can be used in the file system.
9 is a flowchart for explaining a process in a case where a file name need not be converted.

FIG. 9 is a flowchart for explaining processing in a case where a specific character string is used at a specific position of a file name and the file name need not be converted.

[Explanation of symbols]

1 ... user, program, 2 ... user file name, 3 ...
File system expansion device, 4 ... File search processing unit,
5: File creation processing unit, 6: File deletion processing unit, 7
... Free entry management processing unit, 8 ... File name storage table, 9 ... System file name, 10 ... Information processing device,
11: File system, 12: Index of entry, 13: Used / unused flag, 14: File name before conversion, 15: Free entry list, 16: Head of free list, 17: Index of next free list.

Claims (9)

[Claims] In an indirect file access method in a file system for managing files using file names, a user file name storage means for storing user file names used by users and programs is provided, and an arbitrary file used by the users and programs is provided. The user file name is converted into a system file name including storage location information in which the user file name is stored in the user file name storage means, and the converted file name is accessed as a file name. An indirect file access method, wherein storage location information in the user file name storage means is extracted from a system file name and converted into a user file name by referring to the user file name storage means. 2. An information processing apparatus having a file system for managing files using file names, a user file name storage means for storing user file names used by users and programs, and an arbitrary user file used by users and programs. Name conversion means for converting a file name into a system file name including storage location information in which the user file name is stored in the user file name storage means; and a system converted by the system file name conversion means. File system access means for accessing the file system using a file name as a file name; extracting storage location information in the user file name storage means from the system file name; The information processing apparatus characterized by comprising: a user file name conversion means, a to convert to. 3. A file system for managing a file using a file name, the character set that can be used as a file name in the file system is restricted, and the file is used as a user file name used by a user or a program. In an information processing apparatus capable of using a character set other than a character set that can be used as a file name in a system, a user file name storage unit that stores the user file name in association with a system file name used by the file system A system file name conversion means for converting the user file name into a system file name in accordance with a character set restriction that can be used as the system file name; and a system file name converted by the system file name conversion means. File system access means for accessing the file system using a file name as a file name, and user file name conversion means for converting a system file name to a user file name by referring to the user file name storage means. Characteristic information processing device. 4. The information processing apparatus according to claim 3, wherein said system file name conversion means stores said user file name in said user file name storage means for an arbitrary user file name. The user file name converting means extracts the storage position information in the user file name storage means from the system file name and refers to the user file name storage means to convert the user file name into a user file name. An information processing apparatus, which converts the information into an information. 5. The information processing apparatus according to claim 3, wherein the system file name conversion unit is configured to determine that the user file name conforms to a character set restriction that can be used as a file name in the file system. An information processing apparatus, wherein a user file name is used as it is as a system file name. 6. A file system for managing a file using a file name, wherein the length of the file name in the file system is restricted, and a file name in the file system is used as a user file name used by a user or a program. In an information processing apparatus capable of using a file name having a length exceeding the length limit, user file name storage means for storing the user file name in association with a system file name used by the file system, A system file for converting an arbitrary user file name into a system file name including storage location information in which the user file name is stored in the user file name storage means in accordance with the restriction on the length of the file name in the file system Name conversion means; File system access means for accessing the file system using the system file name converted by the file name conversion means as a file name; storage location information in the user file name storage means from the system file name; And a user file name conversion unit for converting the user file name into a user file name by referring to the information processing apparatus. 7. The information processing apparatus according to claim 6, wherein the system file name conversion unit conforms to a limit on a length of the user file name that can be used as a file name in the file system. In such a case, the information processing apparatus uses the user file name as it is as a system file name. 8. The information processing apparatus according to claim 2, wherein a specific character string is included in a specific position of a system file name converted by the system file name conversion means, When a specific character string is included in a specific position of the system file name processed by the user file name conversion unit, the system file name is used as the user file name as it is. 9. A computer, comprising: a user file name storage function for storing a user file name used by a user or a program; and using the user file name storage function, an arbitrary user file name used by the user or the program. A system file name conversion function for converting to a system file name including storage location information in which a user file name is stored; and using the system file name conversion function, accessing the file system using the converted system file name as a file name. A recording medium for recording a program for executing a user file name conversion function for extracting storage location information from the system file name and converting the information to a user file name.