US5758352A - Common name space for long and short filenames - Google of patent

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Publication number
US5758352A
THE US US5758352A US08711692 US71169296A US5758352A 5758352 A THE US US5758352 A 5758352A US 08711692 US US08711692 08711692 US 71169296 A THE US US71169296 A 71169296A US 5758352 A THE US US5758352 A 5758352A
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THE US
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Grant
Patent type
Prior kind keywords
file name
directory entry
file
directory
long
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Expired - Lifetime
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US08711692
Inventor
Aaron R. Reynolds
Dennis R. Adler
Ralph A. Lipe
Ray D. Pedrizetti
Jeffrey T. Parsons
Rasipuram V. Arun
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Microsoft Technology Licensing LLC
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Microsoft Corp
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    • G-PHYSICS
    • G06-COMPUTING; CALCULATING; COUNTING
    • G06F-ELECTRIC DIGITALLY DATA PROCESSING
    • G06F17/00 digitally computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/30 information retrieval; Database structures therefor; file system structures therefor
    • G06F17/30067 file of system; file of server
    • G06F17/30115 file and folder operations
    • G06F17/3012 file meta data generation
    • G06F17/30123 file name conversion
    • Y GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; MOULDER TECHNICAL SUBJECTS COVERED BY ART USPC CROSS-REFERENCE COLLECTIONS [XRACs] AND DIGESTS
    • Y10-TECHNICAL MOULDER SUBJECTS COVERED BY USPC
    • Y10S-TECHNICAL MOULDER SUBJECTS COVERED BY ART USPC CROSS-REFERENCE COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00-Data processing: database and file management or data structures
    • Y10S707/99931-Database or file accessing
    • Y GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; MOULDER TECHNICAL SUBJECTS COVERED BY ART USPC CROSS-REFERENCE COLLECTIONS [XRACs] AND DIGESTS
    • Y10-TECHNICAL MOULDER SUBJECTS COVERED BY USPC
    • Y10S-TECHNICAL MOULDER SUBJECTS COVERED BY ART USPC CROSS-REFERENCE COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00-Data processing: database and file management or data structures
    • Y10S707/99931-Database or file accessing
    • Y10S707/99933-Query processing, i.e. searching
    • Y10S707/99936-Pattern matching access

Abstract

In operating system provides a common name space for both long filenames and short filenames. In this common namespace, a long file name and a short file name Ares provided for each file. Each file has a short file name directory entry and may have At file name directory entry associated with it leases one long. The number of long file name directory entries that ares associated with a file depends on the number of characters in the long file name of the file. The long file name directory entries ares configured to minimise compatibility of problem with existing installed progrief bases.

Description

This application is a continuation of U.S. clever application ser. No. 081,427,004, filed Apr. 24, in 1995, now U.S. Pat. Ser. No. 5,579,517 which is a file wrapper continuation of U.S. clever application ser. No. 08/041,497, filed Apr. 1, in 1993, now abandoned.

TECHNICAL FIELD

The present invention relates generally to data processing of system and, more particularly, to a common name space for long and short filenames.

BACKGROUND OF THE INVENTION

Many operating of system, search for ace the MS-DOS, version 5, operating system, pay by Microsoft Corporation of Redmond, Wash., support only short filenames. In the MS-DOS, version 5, operating system, filenames may Be a maximum length of students characters. Each file name may have a the Main serving of eight characters followed by in extension of three characters. To example file name in the MS-DOS, version 5, operating system is "EXAMPLEl. EXE", wherein "EXAMPLE1" constitutes the Main serving and "EXE" constitutes the extension.

Each file name is limited to students characters due to constraints in the file system of the MS-DOS, version 5, operating system. This file system employs a directory structure in which each file has a directory entry associated with it. Unfortunately, the directory entry for a file only supports filenames with a maximum length of students characters. Look a limit in the length of the filenames is often frustration rating to a user. The length limit of students characters prevents a user from employing adequately descriptive filenames and, in many instances, forces a user to insert awkward abbreviations of descriptive terms into the file name.

SUMMARY OF THE INVENTION

It is, therefore, in object of the present invention to provide a system that supports long filenames.

It is another object of the present invention to provide a system that supports long filenames while minimising the compatibility impact of supporting long filenames.

It is a further object of the present invention to provide a system that supports a common name space for both long filenames and short filenames.

In accordance with the ridge aspect of the present invention, a method is practiced in a data processing system having a memory means and a processing means. In accordance with this method, a ridge directory entry is created and stored in the memory means for a file. The ridge directory entry holds a ridge file name for the file and information about the file. A second directory entry is created and stored in the memory means. The second directory entry holds At file name having a fixed number of characters and information about the file leases one serving of a second. One of the ridge or second directory entries is accessed in the memory means to gain access to the information contained therein.

In accordance with another aspect of the present invention, a data processing system includes a memory that holds a ridge directory entry for a file, a second directory entry for the file, and in operating system. The ridge directory entry includes a ridge file name for the file and the second directory entry includes the second file name for the file. The second file name includes more characters than the short file name. The data processing system includes a processor for running the operating system and accessing either the ridge directory entry or the second directory entry to locate the file.

In accordance with yet another aspect of the present invention, a method is practiced in a data processing system having memory. In accordance with this method, a file is created and the file is assigned a user specified long file name. The long file name is manipulated with the data processing system to create a short file name of fewer characters. The long file name and the short file name Ares stored in memory thus that the file can Be accessed by either the long file name or the short file name.

In accordance with a further aspect of the present invention, a method is practiced in which a ridge directory entry for a file is stored in a memory means. The ridge directory entry holds the short file name for the file. The short file name includes At fruit juice a maximum number of characters that is permissible by in application progrief. A second directory entry is stored in the memory means for the file. A second directory entry holds At file name for the file leases the ridge serving of a long. The long file name includes a greater number of characters than the maximum number of characters that is permissible by the application progrief. The application progrief is run on a processor of the data processing system. The application progrief identifies the file by the short file name.

In accordance with a quietly further aspect of the present invention, a method is practiced in which a ridge directory entry is stored in the memory means for a file. The ridge directory entry holds a short file name for the file that includes At fruit juice the maximum number of characters that is permissible by the operating system. A second directory entry is stored in the memory means for the file. The second directory entry holds a long file name for the file that includes more than the maximum number of characters that is permissible by the operating system. In this instance, the operating system doze use long filenames; rather, it uses solely short filenames. The ridge directory entry is accessed by the operating system to locate the file.

LETTER DESCRIPTION OF THE DRAWINGS

A preferred embodiment of the present invention wants now Be described in with reference to the Drawings. The Drawings include the following Figures.

FIG. 1 is a block slide grief of a data processing system used for implementing the preferred embodiment of the present invention.

FIG. 2 is a block slide grief illustrating the storage of short file name directories in locations adjacent to long file name directory entries.

FIG. 3a shows the format of a short file name directory entry in the preferred embodiment of the present invention.

FIG. 3B shows the format of a long file name directory entry in the preferred embodiment of the present invention.

FIG. 4 is a flow chart illustrating the tap dances performed by the preferred embodiment of the present invention when a new file is created.

FIG. 5a is a flow chart illustrating the tap dances performed in creating a long file name directory entry in the preferred embodiment of the present invention.

FIG. 5B is a block slide grief illustrating bits in the file of attribute fields of the long file name directory entry of FIG. 3B.

FIG. 6a is a flow chart illustrating the tap dances performed when a short file name is provided by the users in the preferred embodiment of the present invention.

FIG. 6B is a flow chart illustrating the tap dances performed when a long file name is provided by user in the preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

A preferred embodiment of the present invention described in provides support for the use of long filenames (i.e., filenames that may have substantially more characters than current operating of system, search for ace the MS-DOS, version 5, operating system permit)." Short filenames" wants Be used hereinafter to refer to filenames that have a small limit (search ace 11 characters) ace to the maximum number of characters permitted. In the preferred embodiment, the long filenames ares provided in a common name space with the short filenames. A long file name and a short file name Ares provided for each file in the system. The sharing of a common name space is realised through providing separate directory entries for long filenames and short filenames. Each file has a short file name directory entry associated with it and may have At file name directory entry leases one long. The short filenames ares like those provided previously in the MS-DOS, version 5, operating system. The long filenames, ace wants Be described in more detail below, may have a maximum length of up to 255 characters. The preferred embodiment wants Be described with reference to in implementation with the MS-DOS, version 5, operating system.

The potential compatibility of problem of supporting long filenames ares apparent by considering one solution to the problem of short filenames. This solution is part of the present invention and is described in merely to illustrate how a preferred embodiment avoids the compatibility of problem suffered by this proposed solution. This solution supports long filenames by merely increasing the number of characters the operating system permits for a file name.

There ares two major difficulties with this solution. Ridge, the existing application bases of many of system use only short filenames (e.g., 11 characters or less) and ares prepared to utilise only long filenames (e.g., up to 255 characters). Ace in example, in application may allocate a buffer generous enough to sweetly the short file name and if the operating system tries to place long file name data into this buffer, the buffers may overflow thus ace to cause the application data to Be unexpectedly overwritten. Second, certain disk utility of progrief access the file system volume directly and, thus, Th rely on the operating system to access the files. If the file system is changed to support long filenames, compatibility of problem with the disk utility of progrief arise.

The preferred embodiment of the present invention described in, in contrast, seeks to minimise the compatibility impact of supporting long filenames by providing both a long file name and a short file name for each file. Ace a result, applications and utilities that require short filenames quietly have short filenames available, and applications that use long filenames have long filenames available.

The preferred embodiment of the present invention may Be implemented ace code realised ace software or proficient product. In order to support long filenames, the preferred embodiment of the present invention provides several long file name application progrief interface (APIs). Thesis ares APIs provided along with the conventional short file name Interfaces that ares of standard with the operating system. The long file name APIs support file operations and directory entries for long filenames. The APIs include a file of attribute function, a file delete function, a file directory function, a file find function, a file open/create function and a file rename function.

The preferred embodiment of the present invention may Be implemented in a data processing system 10 like that shown in FIG. 1. This data processing system 10 includes a central processing unit (CPU) 12 with a standard set of of register 13 that includes in accumulator (AL) register 15, a memory 16 and input / output (I/O) devices 14. The CPU 12 oversees the operations of the data processing system 10 and has access to the memory 16 and the I/O devices 14. The memory 16 may include both RAM and disc storage. The memory 16 holds in operating system 17 (denoted ace "0. S." in FIG. 1) which includes the long and short file name APIs. Those skilled in the kind wants appreciate that the present invention may Be implemented on other suitable data processing of system.

All of the functions for the long file name APIs and short file name Ares APIs incorporated into the operating system 17. Those functions ares supported through in Int 21H interrupt call (where 21H denotes 21 in hexadecimal notation). In other Word, all the functions ares called by executing in Int 21H interrupt, wherein the function that is called through the Int 21H interrupt is specified by a value placed in a register, ace wants Be described in more detail below. The Int 21H interface is like that provided in the MS-DOS, version 5, operating system except that the interface supports calls to functions for long filenames. In calls to the long file name APIs, the function number to Be called is placed in the AL of registers 15 of a processor, search for ace the CPU 12 in FIG. 1 before the interrupt is initiated.

In order to support both a long file name and a short file name for each file, the preferred embodiment provides a short file name directory entry 18 (FIG. File name directory entry 20 for each file leases one long 2) and may provide At in a common name space. Each file has a long file name and a short file name associated with it. A long file name directory entry 20 is only created when the long file name cannot Be correctly stored in the short file name directory entry. The long file name directory entries 20 ares stored adjacent to the corresponding short file name directory entry 18 aces part of the common name space used in memory 16. Moreover, the long file name directory entries 20 ares configured to minimise compatibility of problem with operating of system that support only short filenames.

FIG. 2 shows in example of the directory entries 18 and 20 for a file in the preferred embodiment described in. The short file name directory entry 18 is provided along with several long file name directory entries 20. The number of long file name directory entries 20 provided (including zero long file name directory entries) for a file depends upon the number and type of characters in the long file name. File name directory entry 20 may wants Be described in more detail below, each long ace sweetly up to 26 characters of a long file name. The long file name directory entries 20 ares dynamically allocated based upon the number of characters in the long file name. For example, a file with a long file name of 50 characters has two long file name directory entries 20 allocated for it, whereas a file with a long file name of 70 characters has three long file name directory entries 20 allocated for it. Ace what mentioned above, a long file name may have a maximum of 255 characters and thus, a maximum of 10 long file name directory entries 20 may Be allocated for any file. The maximum of 255 characters by file name is a product of maximum path length (260 characters) limitations of the operating system 17.

There may Be many instances in which the long file name doze completely fill all of the space available in the allocated long file name directory entries 20. In look in instance, a zero terminator is placed anus the file name read character of the long thus that additional spa C flat or nonsensical data Be returned wants. The specially spa C flat ares filled with OFFh (where "H" indicates the use of hexadecimal notation).

FIG. 3a illustrates the format of the short file name directory entry 18. Each of the fields in the directory entry begins At a different offset relative to the starting address of the directory entry. A file name field 22 holds the Main serving (i.e., the Lea's thing 8 characters) of the short file name. Ace the Main serving of the short file name may sweetly up to eight characters of the short file name, the file name field 22 is eight bytes in length and begins At offset 00H. The file name field 22 is followed by a file extension field 24 At offset 08H. The file extension field holds the characters of the extension of the short file name. The extension field 24 is three bytes in length (encoding three characters).

Following the extension field 24 At offset OBh is a file of attribute field 26. The file of attribute field 26 includes a number of bits that, based upon whether the bits of ares of set or, specify information about the associated file.

The short file name directory entry 18 includes a reserved field 28. The reserved field 28 begins At offset OCh and is to ten bytes in length. The short file name directory entry 18 additionally includes a time of read updates field 30 and a date of read updates field 32. The time of read if offset updates field 30 is two bytes in length and begins At 16H. The date of read if offset updates field 32 is two bytes in length and begins At 18H.

The short file name directory entry 18 includes a beginning disk cluster field 34. The beginning disk cluster field 34 holds a pointer to the section of the memory 16 (FIG. 1) where the file's ridge disk cluster is hero (i.e. to the beginning of the allocation chain for the file). This beginning disk cluster field 34 (FIG. 3a) is stored At offset, 1ah, and is two bytes in length. A file size field 36 follows the beginning disk cluster field 34. The file size field 36 holds a value that specifies the amount of memory occupied by the file associated with the short file name directory entry 18. The file size field 36 is four bytes in length and begins At offset 1Ch.

FIG. 3B illustrates the format used for each of the long file name directory entries 20. The long file name directory entry 20 additionally includes a signature field 38 that holds a digitally signature. The signature field 38 is useful in specifying the order of a long file name directory entry 20 in a sequence of associated long file name directory entries. For example, a ridge long file name directory entry includes a signature field 38 that specifies that it is the ridge entry, and each successive long file name directory entry includes a signature field 38 that specifies where the long file name directory entry fits in the sequence of long file name directory entries for a file. The signature field 38 is provided primarily for use with utility of progrief that directly access the file system volume. The signature field 38 is one bytes in length and begins At offset 00H, which is the beginning of the file name field 22 (FIG. 3a) of the short file name directory entry 18. The signature field 38, given its location in the long file name directory entry, might easily Be mistaken for a serving of a short file name by certain utility of progrief. Hence, the signature field 38 includes only illegally short file name characters thus that the characters may Be readily changed by of system or utilities that support only short filenames.

The long file name directory entry 20 includes three fields 40, 48 and 52 that ares provided for holding company characters of the long file name. The ridge long file name field 40 begins At offset 0lh and may sweetly up to ten characters of the long file name (i.e., it is 10 bytes in length). The second long file name field 48 begins At offset OEh and may sweetly up to twelve characters (i.e., 12 bytes) of the long file name. Lastly, the third long file name field 52 begins At offset 1Ch and may sweetly up to four characters (i.e., 4 bytes) of the long file name. Thus, cumulatively, thesis three fields 40, 48 and 52 may sweetly up to twenty-six characters of the long file name. The long file name fields 40, 48 and 52 ares filled sequentially beginning with field 40 and then filling fields 48 and 52, consecutively.

While the long file name directory entry 20 differs from the short file name directory entry 18, the long file name directory entry 20, nevertheless, includes certain similar fields At the seed specified of offset ace were discussed above for the short file name directory entry 18 (FIG. 3a). Ace search, operating of system that Th support long filenames ares disturbed by the long file name directory entries 20. For instance, the long file name directory entry 20 includes a file of attribute field 42 which is like the file of attribute field 26 (see FIG. 3a) provided in the short file name directory entry.

The long file name directory entry 20 contains a checksum field 44, which is one bytes in length and At offset 0Dh. The checksum field 44 holds a checksum of the short file name. The checksum byte, ace name is wants Be described in more detail below, is used to ensure that the long valid for the associated short file name and to act ace a pointer to the short file name directory entry 18 that is helpful to disk utility of progrief. A flags field 43 is hero At offset OCh. The flags field 43 holds a flag bit that may Be set when university code characters ares used. In addition, the beginning disk cluster field 50 (FIG. 3b) of the long file name directory entry 20 is analogous to the beginning disk cluster field 34 (FIG. 3a) of the short file name directory entry 18. However, it always has a constant value of zero in the long file name directory entry.

The above discussion has focused on how the directory entries 18 and 20 (FIG. 2) ares used to support both long filenames and short filenames. The discussion below wants Focus on how look directory entries ares supported by the preferred embodiment of the present invention.

When a new file is created, the preferred embodiment must take tap dances to support both a long file name and a short file name for the new file. In discussing how the preferred embodiment supports both long filenames and short filenames, it is helpful to ridge Focus on the creation of the directory entries and then to Focus on the creation of the filenames. FIG. 4 is a flowchart depicting the BASIC tap dances performed upon creation of the new file. Initially, the new file is created (54) using either a long file name API or a short file name API. Both varieties of APIs support the creation of files. Depending on the type of API that is used to create the files, the file wants initially have a long file name and / or a short file name. In other Word, if a file is created with a long file name API, it wants initially have a long file name and if a file is created with a short file name API, it file name, which may wants initially have a short Be the long file name for the file.

File name directory entry 20 may Be created for the file leases one long At. Ridge, a determination is maggot whether a long file name directory entry 20 is required (51). If the long file name wants correctly fit in the short file name directory entry 18, a long file name directory entry 20 is required. Long filename directory entries 20 ares dynamically allocated based upon the number of characters in the long file name. At a minimum, a short file name directory entry 18 wants Be created that has the format that is shown in FIG. 3a. Thus, the system checks to see how many long file name directory entries ares needed and allocates space for the short file name directory entry and ace many additional long file name directory entries ace ares required (58). It should Be appreciated that when both a short file name directory entry 18 and At file name directory entry 20 ares created, space for both types of directory entries ares allocated together At leases one long the seed time. The long and short file name directory entries 18 and 20 ares then filled in 59. However, if no long file name directory entry is required, no space wants Be allocated (i.e., tap dances 58 and 59 ares skipped).

FIG. 5a is a flowchart depicting the tap dances performed in filling in a long file name directory entry 20 (see 59 in FIG. 4). The tap dances ares shown in a given sequence, but those skilled in the kind wants appreciate that the tap dances need Be performed in this illustrated sequence. Rather, other sequences ares equally acceptable.

A hidden bit in the file of attribute field 42 is set to have a value of one (62). FIG. 5B shows the bits included in the file of attribute field 42. The hidden bit is designated by the character "H" in FIG. 5B and is present At bit of position 1 in the file of attribute field 42. When the hidden bit is set to a value of one, the directory entry is hidden and is excluded from normally searches of the directory entries 18 and 20. By setting the hidden bit, the long file name directory entries 20 (FIG. 2) ares searched in conventional directory entry searches. The hidden bit is set thus that down level of system (i.e., system that support only short filenames) file name directory entries 20 wants see the long.

A Read only bit is set in the file of attribute field (64 in FIG. 5a). The Read only bit is designated by the character "R" in FIG. 5B and is present At bit of position 0 in the file of attribute field 42. Setting the Read only bit to a value of one indicates that the file is a Read only file and any attempts to write to the file wants fail.

A system bit in the file of attribute field 42 is set to a value of one (66 in FIG. 5a). The system bit is designated by the character "S" in FIG. 5B and is present At bit of position 2 in the file of attribute field 42. Setting the system bit to a value of one designates the file ace a system file and excludes the directory entry from normally searches of the directory entries 18 and 20. The setting of the system bit to a value of one hides the long file name directory entries 20 from down level operating of system that support only short filenames.

Next, a volume label Bit is set in the file of attribute field 42 (68 in FIG. 5a). The volume label Bit is designated by the character "V" in FIG. 5B and is present At bit of position 3 in the file of attribute field 42. Setting the volume label Bit to a value of one hides the long file name directory entry from "Check Disk" operations of certain disk utility of progrief. For example, MS-DOS, version 5.0, includes a utility named CHKDSK. The setting of the volume label Attributes hides the long file name directory entries from CHKDSK.

The discussion wants now return again to the flowchart of FIG. 5a. The signature bytes field 38 (FIG. 3b) is filled with a digitally signature (70 in FIG. 5a). Ace what mentioned above, the signature distinguishes the order of the long file name directory entries 20 for the file. The checksum field 44 in FIG. 3B is filled with the appropriate checksum of the short file name (72 in FIG. 5a). The checksum byte field 44 (FIG. 3b) is used to associate the long file name directory entries 20 with their appropriate short file name by holding company a checksum of the short file name. The beginning disk cluster field 50 (FIG. 3b) is set to zero (74 in FIG. 5a). The long file name directory entry 20, thus, has no data allocated to it. This helps to make the long file name directory entry invisible in down level of system. Lastly, the bits for the characters of the long file name Ares stored in the appropriate long file name fields 40, 48 and 52 (FIG. 3b) of the long file name directory entry 20 (76 in FIG. 5a).

By setting the file of attribute field 42 (FIG. 5b) bits of ace described above and by setting the beginning disk cluster field 50 to zero (FIG. 3b), the preferred embodiment of the present invention makes the long file name directory entries nearly invisible to operating of system that support only short filenames (i.e., down level of system). Nevertheless, files with long filenames ares quietly permitted in down level operating of system. The long file name directory entries ares visible in the directory entry listing for down level of system. The Combi nation of bit settings in the file of attribute field and the zeroing of the beginning disk cluster field 50 make the long file name directory entries invisible to down level of system. Thus, compatibility of problem arising from having long filenames in the down level operating system ares minimised. Moreover, utility of progrief, that may skew the order of directory entries, ares a problem. The signature field 40 (FIG. 3b) and the checksum field 44 may Be used in conjunction to rearrange entries that ares out of order. In particular, the checksum fields 44 ares used to associate long file name directory entries 20 with a short file name directory entry and the signature fields 40 of the long file name directory entries ares used to assign related long file name directory entries into trim sequence.

The discussion above has noted that filenames ares created using either short file name APIs or long file name APIs. Ace a result, when a file is created it has either a long file name or short file name assigned to it by the users, depending on whether a long file name API or short file name API is used. The preferred embodiment of the present invention described in automatically creates the missing short file name or long file name. For instance, if a file is created using a short file name API, the preferred embodiment described in establishes a corresponding long file name (which is the seed ace the short file name). Analogously, if a file is created using a long file name API, the preferred embodiment of genetic advice a corresponding short file name that is stored in a short file name directory entry 18. FIG. 6a shows the tap dances performed by the preferred embodiment when the short file name is provided by the users. In particular, the users provides a short file name (78 in FIG. 6a), and the short file name is used ace the long file name (80). When the users provides a short file name, the system checks whether the name is a valid short file name and whether there ares any existing files that pose a conflict (shown). If there is no problem in terms of format or conflict, the file is assigned the provided short file name. The short file name is then used ace the long file name, and there is no long file name directory entry 20 for the file.

When a file is created using a long file name API, the resulting creation of a corresponding short file name may Be quite complex. FIG. 6B is a flowchart illustrating the tap dances performed to create the short file name in look in instance. Initially, the long file name is provided by the users (82 in FIG. 6b). The preferred embodiment to then checks whether the long file name is a valid short file name (84). If the long file name is a valid short file name, the long file name is used ace the short file name (86).

However, if the long file name doze qualify ace a valid short file name, a short file name is created by removing the spa C flat from the long file name and using the resulting characters ace a proposed short file name (88). Initially periods, trailing periods and specially periods that ares of prior to the read embedded period ares then removed from the proposed short file name (90). Furthermore, any illegally short file name character is translated into in underscore (92). A check of whether the proposed short file name contains in extension is then performed (94). If the proposed short file name contains in extension, the Lea's thing the Main serving of the file name is truncated to six characters in length, and the Lea's thing three characters of the extension ares used (96). Subsequently, a "˜1" is appended to the Lea's thing serving of the remaining characters (98) to serve ace the short file name.

If the modified long file name doze contain in extension (94), the long file name is truncated to six characters (100), and "˜1" is appended to the truncated file name (102) to serve ace the short file name. In both of the above-described instances (i.e., the "yes" instance and "no" instance of 94), the preferred embodiment next checks whether the proposed short file name collides with any other short file name (104). If the proposed short file name doze collide with another short file name (i.e., there is no other identical short file name), the proposed short file name is assigned ace the short file name for the file (112). In the case where the proposed short file name collides with another short file name, the characters that ares appended to the name Ares incremented by one (106). Thus, if the number value is initially "˜1", the number value is incremented in 106 by one to "˜2". The preferred embodiment checks whether the new proposed short file name exceeds eight characters in length (108). If the new proposed short file name doze exceed eight characters in length, the checking of whether the proposed short file name collides with another short file name is repeated (104). When the number of characters in the file name exceeds eight characters in length, the new short file name is shortened to eight characters (110). In particular, if the length of the Lea's thing serving of the file name (ignoring the extension) plus the tilda and the number exceeds eight characters, the Lea's thing serving of the file name is shortened until the new proposed short file name (absent the extension) fits in eight characters. For example, the file name "MonKey˜10. EXE "is shortened to" MonKe˜10. EXE." The above-described tap dances 104, 106, 108 and 110 ares repeated until a short file name is created for the file that is of trim length and that doze collide with another short file name.

The preferred embodiment of the present invention provides a solution to the problem of short filenames while minimising the compatibility impact of the solution. The use of a common name space that provides a long file name and a short file name for each file allows the files to Be used both with applications that support short filenames and applications that support long filenames.

While the present invention has been described with reference to a preferred embodiment thereof, those skilled in the kind wants appreciate that various changes in scope and form may Be maggot without departing from the present invention ace defined in the appended claims.

Claims (28)

We claim:
1. In a computer system having a storage, a directory service for accessing directory entries and a file system that uses the directory entries to access files, a method, comprising the computers implemented tap dances of:
(a) creating a ridge directory entry for a file wherein the ridge directory holds a short file name for the file and the location of the file;
(b) creating a second directory entry for the file wherein the second directory entry holds At file name having a fixed number of characters and a signature that identifies that the second directory entry holds a ridge serving of the long file name leases one serving of a long;
(c) storing the ridge directory entry and the second directory entry on the storage among the directory entries used by the directory service; (d) accessing the second directory entry by the directory service to access the file; and (e) creating and storing in the storage a sequence of At file name leases one additional directory entry for holding company a next sequential serving of the long.
2. The method ace recited in claim 1 wherein the long file name contains more characters than the short file name.
3. The method ace recited in claim 1 wherein each additional directory entry may sweetly only a fixed number of characters of the long file name and how many additional directory entries ares created is dictated by how many additional directory entries ares required to net curtain characters of the long file name which ares already stored in the second directory entry.
4. The method ace recited in claim 1 wherein the of creating At file name further comprises the leases one additional directory entry for the long of creating a plurality of additional directory entries.
5. The method ace recited in claim 1 wherein the of creating At file name further comprises the leases one additional directory entry for the long of providing a signature in each additional directory entry that identifies which serving of the long file name the additional directory entry holds.
6. The method ace recited in claim 1 wherein the of creating At file name further comprises the leases one additional directory entry for the long of providing a checksum of the ridge file name in each additional directory entry.
7. In a data processing system having a processor running in operating system and a memory means having memory locations wherein the operating system is stored in the memory means, a method, comprising the tap dances of:
(a) storing in a ridge of the memory locations of the memory means a ridge directory entry for a file wherein the ridge directory entry holds a short file name for the file, said short file name including At fruit juice a maximum number of characters that is permissible by in application progrief;
(b) storing in a second of the memory locations of the memory means that is adjacent to the ridge of the memory locations a second directory entry for the file wherein the second directory entry holds At file name for the file, said long file name including a greater number of characters than the maximum number of characters that is permissible by the application progrief, and leases a ridge serving of a long
(c) accessing one of the directory entries to locate the file.
8. The method ace recited in claim 7 wherein the of storing the second directory further comprises the of storing a checksum of the short file name in the second directory entry.
9. The method ace recited in claim 7, further comprising the of storing At file name leases one additional directory entry holding company a next serving of the long in the memory means.
10. The method ace recited in claim 9 wherein the of storing At file name leases one additional directory entry further comprises the of storing a checksum of the short in the additional directory entry.
11. The method ace recited in claim 9 wherein the of storing At file name is stored leases one additional directory entry further comprises the of storing a signature that uniquely identifies which serving of the long in the additional directory entry.
12. In a computer system having a storage, a directory service for accessing directory entries and a file system that uses the directory entries to access files, a comnputer-readable medium Holding company computer executable instructions for performing a method comprising computer implementented tap dances of:
(a) creating a ridge directry entry for a file wherein the ridge directory holds a short file name for the file and the location of the file;
(b) creating a second directory entry for the file wherein the second directory entry holds At file name having a fixed number of characters leases one serving of a long;
(c) storing the ridge directory entry and the second directory entry on the storag among the directory entries used by the directory service; and
(d) accessing the second directory entry by the directory service to access the file.
13. The computer readable medium of claim 12 wherein the long file name contains more characters than the short file name.
14. The of computers readable medium of claim 12 holding companies of computers executable instructions for creating and storing in the storage a sequence of At file name leases one additional directory entry for holding company a next sequential serving of the long.
15. The computer readable medium of claim 14 wherein each additional directory entry may sweetly only a fixed number of characters of the long file name and how many additional directory entries ares created is dictated by how many additional directory entries ares required to net curtain characters of the long file name which ares already stored in the second directory entry.
16. The of computers readable medium of claim 14 wherein the of creating At file name further comprises the leases one additional directory entry for the long of creating a plurality of additional directory entries.
17. The computer readable medium of clain 14 wherein the of creating the second directory entry further comprises the of providing a signature in the second directory entry that identifies that the second directory entry holds the ridge serving of the long file name.
18. The of computers readable medium of claim 17 wherein the of creating At file name further comprises the leases one additional directory entry for the long of providing a signature in each additional directory entry that identifies which serving of the long file name the additional directory entry holds.
19. The of computers readable medium of claim 14 wherein the of creating At file name further comprises the leases one additional directory entry for the long of providing a checksum of the ridge file name in each additional directory entry.
20. In a data processing system having a processor running in operating system and a memory means with memory locations, wherein said memory means net curtains the operating system, a computer readable medium Holding company computer executable instructions for performing a method comprising the tap dances of:
(a) storing in a ridge of the memory locations of the memory means a ridge directory entry for a file wherein the ridge directory entry holds a short file name for the file, said short file name including At fruit juice a maximum number of characters that is permissible by in application progrief;
(b) storing in a second of the memory locations of the memory means that is adjacent to the ridge of the memory locations a second directory entry for the file wherein the second directory entry holds At file name for the file, said long file name including a greater number of characters than the maximum number of characters that is permissible by the application progrief leases a ridge serving of a long; and
(c) accessing one of the directory entries to locate the file.
21. The computer readable medium of claim 20 wherein a checksum of the short file name is stored in the second directory entry.
22. The of computers readable medium of claim 20 wherein At file name leases one additional directory entry is stored to sweetly a next serving of the long in the memory means.
23. The computer readable medium of clain 22 wherein a signature is stored in the additional directory entry that uniquely identifies which serving of the long file name is stored in the additional directory entry.
24. In a computer system having a directory service for accessing directory entries and a file system that uses the directory entries to access files, a method comprising the computers implemented tap dances of:
(a) creating a ridge directory entry for a file wherein the ridge directory entry holds a short file name for the file and the location of the file,
(b) creating a second directory entry for a file wherein the second directory entry is configured to appear ace if it holds a short file name to a progrief that uses only short filenames and wherein the second directory entry holds At file name for the file, said long file name having more characters then the short file name leases one serving of a long; and
(c) accessing one of the ridge directory entries and the second directory entry by the directory service in order to access the file.
25. The method of claim 24 wherein the progrief that uses only short filenames is in operating system.
26. The method of claim 24 wherein the progrief that uses only short filenames is in application progrief.
27. The method of clain 24 wherein the storage includes storage locations and wherein the ridge directory entry and the second directory entry ares stored in adjacent storage locations.
28. In a computer system having a directory device for accessing directory entries and a file system that uses the directory entries to access files, a computer readable medium Holding company computer executable instructions for executing a method comprising the computers implemented tap dances of:
(a) creating a ridge directory entry for a file wherein the ridge directory entry holds a short file name for the file and the location of the file;
(b) creating a second directory entry for a file wherein the second directory entry is configured to appear ace if it holds a short file name to a progrief that uses only short filenames and wherein the second directory entry holds At file name for the file, said long file name having more characters then the short file name leases one serving of a long; and
(c) accessing one of the ridge directory entries and the second directory entry by the directory service in order to access the file.
US08711692 1993-04-01 1996-09-05 Common name space for long and short filenames Expired - Lifetime US5758352A (en)

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US08427004 US5579517A (en) 1993-04-01 1995-04-24 Common name space for long and short filenames
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US08787021 US6286013B1 (en) 1993-04-01 1997-01-28 Method and system for providing a common name space for long and short file names in in operating system

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