JP5238210B2 - Information storage medium and file management method - Google Patents

Description

  The present invention relates to an information storage medium called an IC card including an IC (Integrated Circuit) chip having control elements such as a CPU, ROM, RAM, and EEPROM, for example. Furthermore, the present invention relates to a file management method in such an information storage medium.

  In order to make an IC card usable for multiple purposes, a technology related to an IC card that can be operated by a plurality of applications is disclosed (see Patent Document 1).

For example, since the IC card supports a plurality of applications, it can recognize a plurality of different logical connections. Specifically, the IC card can recognize a plurality of different logical connections with an external device in response to designation of a logical channel. The IC card can select a file using partial matching of file names called partial selection.
Japanese Patent No. 2695857

  However, the IC card does not manage information for each logical channel. For this reason, in a multi-application environment, the IC card needs to search for a target file frequently using file selection commands, and it takes time to search for a file. On the other hand, improvement of the file search efficiency is demanded. That is, a technique for efficiently accessing a file stored in an IC card from a host device (for example, an IC card reader / writer) is desired.

  An object of the present invention is to provide a technique for improving the search efficiency of a file stored in an information storage medium called an IC card.

  An information storage medium according to an embodiment of the present invention is an information storage medium including a card body in which a module is embedded, and the module is a logical unit for recognizing a plurality of different logical connections with an external device. Based on the channel designation, a connection means for connecting to an external device through a designated logical channel, a storage means for storing a plurality of files, and a file search by partial matching of file names of a plurality of files stored in the storage means Control means for controlling, based on reception of a command for selecting a file including a partial file name designated by the designated logical channel, the control means is designated by the designated logical channel. Search for all files that partially match the partial file name The memory means sets a memory pointer for a predetermined file in the file, and stores the designated partial file name and a memory pointer address indicating a setting position of the memory pointer for each designated logical channel. Remember me.

  A file management method according to an embodiment of the present invention is a file management method for managing a plurality of files stored in an information storage medium configured by a card body in which a module is embedded, and a plurality of files with an external device. Receiving a command for selecting a file including a partial file name specified by a specified logical channel to recognize a different logical connection, and specifying the specified by the specified logical channel based on the specified command Search for all files that partially match the specified partial file name, set a memory pointer for a predetermined file among all the searched files, and specify the specified for each specified logical channel. A partial file name and a memory pointer address indicating the set position of the memory pointer. To.

  ADVANTAGE OF THE INVENTION According to this invention, the technique for improving the search efficiency of the file memorize | stored in the information storage medium called an IC card can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an example of an IC card according to the present embodiment.

  The IC card 1 is an IC card that supports a contact communication function, for example. The IC card 1 interprets and executes a command from the reader / writer (R / W) 2 and returns the execution result.

  As shown in FIG. 1, the IC card 1 includes an IC chip (IC module) 10. The IC chip 10 includes a contact terminal 11, a communication I / F 106, a CPU 101, a data memory 102, and a RAM 103. The reader / writer 2 communicates with the IC card 1 using the contact communication method via the contact terminal 11.

  The CPU 101 functions as a control unit, and controls file search based on partial matching of file names of a plurality of files stored in the data memory 102. The data memory 102 stores a plurality of files, for example. The data memory 102 is a nonvolatile memory such as an EEPROM or FRAM. The RAM 103 functions as a working memory. The contact communication I / F 106 controls communication performed with the contact R / W 2 via the contact terminal 11.

  With the above configuration, the IC card 1 has the following functions.

A communication function for communicating with the reader / writer 2 (external device). A command processing function for performing processing according to a command (command) received from the reader / writer 2. Data recorded in the data memory 102 File management function for managing in units of files and searching for specified files. Work memory function for temporarily using data recorded in data memory 102. Partial DF selection function (for file names of multiple files. Partial file selection function)
-Logical channel function (function for recognizing multiple different logical connections with Reader / Writer 2)
FIG. 2 is a diagram schematically showing a file in the data memory 102.

  As shown in FIG. 2, the data memory 102 stores MF (Master File) and DF (Dedicated File).

For example, DF0-1, DF0-2, DF0-3,... DF2-3 are stored. DF 0-1, DF 0-2, and DF 0-3 are DF groups whose DF names start with DF 12 34 56. Similarly, DF1-1, DF1-2, and DF1-3 are DF groups whose DF names start with DF 34 56 78. Similarly, DF2-1, DF2-2, and DF2-3 are DF groups whose DF names start from DF 56 78 90. FIG. 3 is a diagram illustrating an example of a partial DF name table 1031 held in the RAM 103. .

  The partial DF name table 1031 stores a partial DF name and a memory pointer address for each logical channel. That is, the partial DF name table 1031 stores the logical channel “0”, the partial DF name “DF 12 34 56”, and the memory pointer address “0000”, and further, the logical channel “1” and the partial DF name “DF 34”. 56 78 ”and the memory pointer address“ 0100 ”are stored, and the logical channel“ 2 ”, the partial DF name“ DF 56 78 90 ”and the memory pointer address“ 0200 ”are stored.

  FIG. 4 is a diagram illustrating an example of the DF management table 1021 in the data memory 102. That is, the data memory 102 manages information including the DF name. FIG. 3 shows how the memory pointer shown in FIG. 3 affects the data memory 102.

  Next, file management will be described with reference to FIG. 3, FIG. 4, and FIG. FIG. 5 is a flowchart illustrating an example of file management.

  First, the IC card 1 is connected to the reader / writer 2 via the contact terminal 11 and activated by the reader / writer 2 (step S1).

  For example, the IC card 1 receives a partial selection command (designation of the logical channel “0” and the DF name “DF 12 34 56”) from the reader / writer 2 (step S2).

  The IC card 1 searches the DF name “DF 12 34 56” from the DF management table 1022 stored in the data memory 102 based on the received partial selection command. If there is no complete match, the memory pointer is moved to the first match, and the logical channel, DF name, and memory pointer address are written in the partial DF name table 1031 stored in the RAM 103 (step S3). Here, the leading address of the DF name starting from the DF name “DF 12 34 56” is “0000”. Therefore, in the partial DF name table, the logical channel “0”, the DF name “DF 12 34 56” and the memory pointer “0000” are written, and at the same time, the memory pointer is moved to address 0000 of the DF management table 1022 in the data memory 102. To do.

  At the next timing, for example, the IC card 1 receives a partial selection command (designation of the logical channel “1” and the DF name “DF 34 56 78”) from the reader / writer 2 (step S4).

  Similar to step S3, the IC card 1 searches the DF name “DF 34 56 78” from the DF management table 1022 stored in the data memory 102 based on the received partial selection command. If there is no exact match, the memory pointer is moved to the first match, and the logical channel, DF name, and memory pointer address are written in the partial DF name table 1031 stored in the RAM 103 (step S5). Here, the leading address of the DF name starting from the DF name “DF 34 56 78” is “0100”. Therefore, in the partial DF name table, the logical channel “1”, the DF name “DF 34 56 78” and the memory pointer address “0100” are written, and at the same time, the memory pointer is stored at address 0100 of the DF management table 1022 in the data memory 102. Moving.

  At the next timing, for example, the IC card 1 receives a partial selection command (designation of the logical channel “2” and the DF name “DF 56 78 90”) from the reader / writer 2 (step S6).

  Similar to step S3, the IC card 1 searches the DF management table 1022 stored in the data memory 102 for the DF name “DF56 78 78” based on the received partial selection command. If there is no complete match, the memory pointer is moved to the first match, and the logical channel, DF name, and memory pointer address are written in the partial DF name table 1031 stored in the RAM 103 (step S7). Here, the leading address of the DF name starting from the DF name “DF 56 78 90” is “0200”. Therefore, in the partial DF name table, the logical channel “2”, the DF name “DF 56 78 90” and the memory pointer address “0200” are written, and at the same time, the memory pointer is stored at address 0200 of the DF management table 1022 in the data memory 102. Moving.

  At the next timing, for example, the IC card 1 receives a partial selection command (logical channel “0”, DF name “DF 12 34 56”, designation of the next file) from the reader / writer 2 (step S8).

  The IC card 1 acquires the partial DF name from the logical channel “0” of the partial DF name table 1031 stored in the RAM 103, and the acquired partial DF name matches the DF name specified by the partial selection command. Then, the memory pointer information is acquired, and the next matching DF is searched after the current memory pointer (step S9).

  The IC card 1 moves the memory pointer to the next match, and updates the memory pointer address of the partial DF name table 1031 stored in the RAM 103. Here, since the next start address of the DF name starting from the DF name “DF 12 34 56” is “0010”, the partial DF name table 1031 has the logical channel “0” and the DF name “DF 12 34 56”. And the memory pointer address “0010” is written, and at the same time, the memory pointer is moved to address 0010 of the DF management table 1022 stored in the data memory 102 (step S10).

  At the next timing, for example, the IC card 1 receives a partial selection command (logical channel “1”, DF name “DF 34 56 78”, designation of the next file) from the reader / writer 2 (step S11).

  The IC card 1 acquires the partial DF name from the logical channel “1” of the partial DF name table 1031 stored in the RAM 103, and the acquired partial DF name matches the DF name specified by the partial selection command. Then, the memory pointer information is acquired, and the next matching DF is searched after the current memory pointer (step S12).

  The IC card 1 moves the memory pointer to the next match, and updates the memory pointer address of the partial DF name table 1031 stored in the RAM 103. Here, since the next start address of the DF name starting from the DF name “DF 34 56 78” is “0110”, the partial DF name table 1031 has the logical channel “1” and the DF name “DF 34 56 78”. And the memory pointer address “0110” is written, and at the same time, the memory pointer is moved to address 0110 of the DF management table 1022 stored in the data memory 102 (step S13).

  Hereinafter, although it deviates from the flowchart shown in FIG.

  At the next timing, for example, the IC card 1 receives a partial selection command (logical channel “2”, DF name “DF 56 78 90”, designation of the next file) from the reader / writer 2.

  The IC card 1 acquires the partial DF name from the logical channel “2” of the partial DF name table 1031 stored in the RAM 103, and the acquired partial DF name matches the DF name specified by the partial selection command. Then, the memory pointer information is acquired, and the next matching DF is searched after the current memory pointer.

  The IC card 1 moves the memory pointer to the next match, and updates the memory pointer address of the partial DF name table 1031 stored in the RAM 103. Here, since the next start address of the DF name starting from the DF name “DF 56 78 90” is “0210”, the partial DF name table 1031 has the logical channel “2” and the DF name “DF 56 78 90”. And the memory pointer address “0210” is written, and at the same time, the memory pointer is moved to the address 0210 of the DF management table 1022 stored in the data memory 102.

  Next, another example after step 13 will be described. In the above steps S8 to S13, the designation of the next file has been described, but here the designation of the previous file will be described.

  For example, the IC card 1 receives a partial selection command (logical channel “0”, DF name “DF 12 34 56”, designation of previous file) from the reader / writer 2.

  The IC card 1 acquires the partial DF name from the logical channel “0” of the partial DF name table 1031 stored in the RAM 103, and the acquired partial DF name matches the DF name specified by the partial selection command. Then, the memory pointer information is acquired, and the next matching DF before the current memory pointer is searched.

  The IC card 1 moves the memory pointer to the place where it matches before, and updates the memory pointer address of the partial DF name table 1031 stored in the RAM 103. Here, since the leading address before the DF name starting from the DF name “DF 12 34 56” is “0000”, the partial DF name table 1031 has the logical channel “0” and the DF name “DF 12 34 56”. And the memory pointer address “0000” is written, and at the same time, the memory pointer is moved to address 0000 of the DF management table 1022 stored in the data memory 102.

  In the above description, the designation of the previous file in step S13 and subsequent steps has been described. However, the designation of the next file in steps S8 to S12 is not essential.

  Further, another example after step 13 will be described. In step S8 to step S13 described above, the designation of the next file has been described, but here the designation of the last file will be described.

  For example, the IC card 1 receives a partial selection command (logical channel “0”, DF name “DF 12 34 56”, designation of the last file) from the reader / writer 2.

  The IC card 1 acquires the partial DF name from the logical channel “0” of the partial DF name table 1031 stored in the RAM 103, and the acquired partial DF name matches the DF name specified by the partial selection command. Then, the memory pointer information is acquired, and the last matching DF is searched after the current memory pointer.

  The IC card 1 moves the memory pointer to the last match, and updates the memory pointer address of the partial DF name table 1031 stored in the RAM 103.

  In the above description, the specification of the last file after step S13 has been described. However, the specification of the next file in steps S8 to S12 is not essential. That is, the last file can be specified as described above without specifying the next file in steps S8 to S12.

  In addition to the next file specification, the previous file specification, and the last file specification, the second file specification, the third file specification, the two previous file specification, the three previous file specification, You can also specify a file.

  As described above, when selecting a plurality of partial DF names with different channels, the IC card 1 creates and holds a partial DF name and pointer information for each channel, and performs the next file search operation and the previous file search operation. The last file search operation can be executed for each channel. Thereby, the IC card 1 can reduce access to the card corresponding to mounting of a plurality of applications. Therefore, the reader / writer 2 (high-order device) can efficiently access the IC card.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be appropriately combined as much as possible, and in that case, the combined effect can be obtained. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.

It is a block diagram which shows an example of the IC card which concerns on this embodiment. It is the figure which showed the file in a data memory typically. It is a figure which shows an example of the partial DF name table hold | maintained at RAM. It is a figure which shows an example of DF management table in a data memory. It is a flowchart which shows an example of file management.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... IC card, 2 ... Reader / writer, 10 ... IC chip (IC module), 11 ... Contact terminal, 101 ... CPU, 102 ... Data memory, 103 ... RAM, 106 ... Communication I / F, 1021 ... DF management table, 1031 ... Partial DF name table,

Claims (6)

An information storage medium comprising a card body in which a module is embedded,
The module is
Based on the designation of a logical channel for recognizing a plurality of different logical connections with an external device, a connection means for connecting to the external device with the designated logical channel;
Storage means for storing a plurality of files;
Control means for controlling file search by partial matching of file names of a plurality of files stored in the storage means;
With
The control means includes
All of the first logical channels that partially match the first partial file name based on receipt of a first command that commands selection of a file that includes the first partial file name on the first logical channel The file is searched, the first memory pointer is moved to the first memory pointer address of the searched first file, and the first file of the first file is associated with the first logical channel. Storing a partial file name and the first memory pointer address in the storage means;
Based on receipt of a second command commanding selection of a file containing a second partial file name on a second logical channel, all of the partial matches with the second partial file name on the second logical channel The file is searched, the second memory pointer is moved to the second memory pointer address of the searched second file, and the second file of the second file is associated with the second logical channel. Storing a partial file name and the second memory pointer address in the storage means;
A third memory pointer address of the last file among all the files already searched on the first logical channel based on the reception of a third command that commands selection of the last file on the first logical channel. The first memory pointer is moved with respect to the first memory pointer address stored in the storage means to the third memory pointer address of the last file,
An information storage medium characterized by the above. The control means includes
Based on the reception of the fourth command for commanding the selection of the next file on the first logical channel, the next file of the first file among all the files already searched on the first logical channel. Moving the first memory pointer relative to a fourth memory pointer address, and updating the first memory pointer address stored in the storage means to the fourth memory pointer address of the next file;
The information storage medium according to claim 1. The control means includes
Based on the reception of the fifth command commanding the selection of the previous file on the first logical channel, the previous file of the first file among all the files already searched on the first logical channel. Moving the first memory pointer with respect to a fifth memory pointer address, and updating the first memory pointer address stored in the storage means to the fifth memory pointer address of the previous file;
The information storage medium according to claim 2. A file management method for managing a plurality of files stored in an information storage medium constituted by a card body in which a module is embedded,
The module connection means receives a first command for commanding selection of a file including a first partial file name on a first logical channel for recognizing a plurality of different logical connections with an external device;
Based on the first command, the control unit of the module searches all files that partially match the first partial file name on the first logical channel, and sets the first of the searched first files. The first memory pointer is moved to one memory pointer address, and the first partial file name of the first file and the first memory pointer address are associated with the first logical channel. Store in the storage means of the module ,
The connection means of the module receives a second command commanding selection of a file containing a second partial file name on a second logical channel for recognizing a plurality of different logical connections with an external device;
The control means of the module searches all files partially matching the second partial file name in the second logical channel based on the second command, and searches for the second file searched for. The second memory pointer is moved to a second memory pointer address, and the second partial file name of the second file and the second memory pointer address are associated with the second logical channel. Remember
The connection means of the module receives a third command commanding the selection of the last file on the first logical channel;
The control means of the module , based on the third command, performs the first memory pointer on the third memory pointer address of the last file among all the files already searched in the first logical channel. Moving a memory pointer to update the first memory pointer address stored in the storage means of the module to a third memory pointer address of the last file;
A file management method characterized by the above. The control means of the module is configured to receive the fourth command instructing selection of a next file on the first logical channel, and to select the first of all files already searched on the first logical channel. The first memory pointer is moved with respect to the fourth memory pointer address of the next file of one file, and the first memory pointer address stored in the storage means of the module is moved to the next file. Updating to the fourth memory pointer address;
The file management method according to claim 4, wherein: The control means of the module is configured to receive the fifth command instructing selection of a previous file on the first logical channel, and to select the first of all files already searched on the first logical channel. The first memory pointer is moved with respect to the fifth memory pointer address of the previous file of one file, and the first memory pointer address stored in the storage means of the module is changed to that of the previous file. Updating to the fifth memory pointer address;
The file management method according to claim 5, wherein:

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