JP2009032249A - Portable electronic device, file management method for portable electronic device, and IC card - Google Patents

Abstract

A portable electronic device capable of writing a number of records exceeding a specified maximum number of records in one file, a file management method for the portable electronic device, and an IC card are provided.
The IC card 1 stores a plurality of file management information having the same file identification information and different usage order information stored in a memory 102, and a command is given from an external device 2. Whether the first file defined in the file management information of the usage order information with the first usage order among the file management information having the file identification information of the file to be accessed is to be accessed. If it is determined and the first file is determined not to be an access target, whether or not the second file defined in the file management information of the usage order information having the second usage order is to be accessed And processing according to the command is performed on the file determined to be the access target.
[Selection] Figure 1

Description

  The present invention relates to a portable electronic device such as an IC card that accesses a file in a nonvolatile memory in accordance with a command given from an external device, and a file management method for the portable electronic device.

  2. Description of the Related Art Conventionally, a portable electronic device such as an IC card has a rewritable nonvolatile memory for storing data and a control element that executes processing on the data in the nonvolatile memory. In such portable electronic devices such as an IC card, a method of managing data stored in a nonvolatile memory in file units is common (see, for example, Japanese Patent No. 2695857). Such an IC card that manages data in units of files does not directly access data stored in the nonvolatile memory. In other words, the IC card first accesses a file in which desired data is stored. When accessing a file, the IC card reads or writes data stored in the file.

  The IC card operates according to a command that is a processing command from an external device. For example, the IC card performs processing for accessing data stored in a file in response to a command from the outside. The command given to the IC card is defined by a predetermined standard. That is, the external device requests access to desired data from the IC card by a command defined by a predetermined standard. In contrast, the IC card interprets a command from an external device based on a predetermined standard, and performs processing according to the command.

  As described above, the IC card operates based on a specific standard. For example, ISO / IEC7816-4, which is an international standard for IC cards, defines the structure and format of a file for storing data (EF: data file called an elementary file). In ISO / IEC7816-4, a command for requesting access to each file in the IC card is also defined.

  In ISO / IEC7816-4, a structure (record structure) having a plurality of records for storing data in a data file is defined as a data structure in a data file in an IC card. The ISO / IEC 7816-4 also defines a command for requesting access to a file having the record structure as described above. However, ISO / IEC7816-4 has a limit on the number of records that can be stored in one data file. For this reason, ISO / IEC7816-4 has a limit on the number of records that can be specified as an access target in a command that requests access to a record-structured file.

  In the ISO / IEC7816-4, “254” is assumed as the maximum number of records stored in one file. That is, in the ISO / IEC7816-4, it is assumed that up to “254” records defined by the record numbers from “1” to “254” are stored in one file. For this reason, in the ISO / IEC7816-4, in the command for requesting access to the record, the value of the record number that can be specified as an access target is “01” to “FE” in hexadecimal, that is, decimal. “1” to “254”.

  On the other hand, in recent years, IC cards or similar portable electronic devices have been used for various purposes. For example, a form in which a booklet in which an IC chip that operates in accordance with an international standard such as ISO / IEC7816-4 is embedded is used as a passport or the like. As portable electronic devices are used in various applications in this way, it is expected that there will be a strong demand for recording data in a single file with more records than the standard assumes for portable electronic devices. Is done. For example, assuming a usage method in which information such as departure and entry is added to a passport embedded with an IC chip without erasing it, the IC chip of the passport contains more records than expected in the standard. It is conceivable that a situation occurs in which it is desired to record a number of data in one file. In addition, a large amount of entry / exit history information can be recorded on an IC card used in a system for managing entry / exit to / from a security area, or an IC card used for a business transaction system such as fee settlement, A request to record a large amount of history information is also expected to occur.

However, in the existing standards as described above, each data file can store only data up to a predetermined number of records. That is, in a system conforming to an existing standard, one data file can handle only data up to a predetermined number of records. Assuming that IC cards will be used in a wide range of fields in the future, it is desirable that the maximum number of records that can be stored in a data file having a record structure is expandable. Furthermore, in consideration of the operation status of the existing system, even if the maximum number of records as described above is expanded, the data file can be created using an existing command as defined in ISO / IEC7816-4. It is desirable to be able to access each record.
ISO / IEC7816-4

  An object of one aspect of the present invention is to provide a portable electronic device, a file management method for a portable electronic device, and an IC card that can easily expand the amount of data that can be managed by a specific file.

  A portable electronic device according to an aspect of the present invention stores a plurality of file management information having the same file identification information and different usage order information set as the first memory for storing data in units of files. When the command is given from the second memory and the external device, it is defined by the file management information of the usage order information whose usage order is the first among the file management information having the file identification information of the file to be accessed A first access determination unit that determines whether or not the first file being accessed is an access target, and an access when the first determination unit determines that the first file is not an access target It is determined by the file management information of the usage order information that has the second highest usage order among the file management information having the file identification information of the target file. A second access determination unit that determines whether or not the second file being accessed is an access target, and a command that is determined to be an access target by the first or second access determination unit And a processing unit that performs a corresponding process.

  According to one aspect of the present invention, there is provided a file management method for a portable electronic device, in which data in units of files is stored in a first memory, the same file identification information is set, and different usage order information is set. File management information is stored in the second memory, and when a command is given from an external device, the usage order is the first among the file management information having the file identification information of the file to be accessed It is determined whether or not the first file defined in the file management information of the rank information is to be accessed, and if it is determined that the first file is not to be accessed, the file of the file to be accessed Among the file management information having identification information, the second file defined in the file management information of the usage order information that has the second highest usage order. Determines whether to Il accessed, it performs processing corresponding to the command for a file is determined to an access target by the determination.

  An IC card according to an aspect of the present invention stores a plurality of file management information in which different usage order information is set with the same file identification information as the first memory that stores data in file units. When the command is given from the memory 2 and the external device, it is defined by the file management information of the usage order information that has the first usage order among the file management information having the file identification information of the file to be accessed. A first access determination unit that determines whether or not the first file being accessed is an access target, and an access target when the first determination unit determines that the first file is not an access target Defined in the file management information of the usage order information that has the second highest usage order among the file management information having the file identification information of the file to be A second access determination unit that determines whether or not the second file is to be accessed, and a file that is determined to be the access target by the first or second access determination unit according to a command A module having a processing unit for performing processing, and a main body storing the module.

  In one embodiment of the present invention, a portable electronic device, a file management method for a portable electronic device, and an IC card that can easily expand the amount of data that can be managed by a specific file can be provided.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration example of an IC card 1 as a portable electronic device and an IC card system including the IC card 1 according to an embodiment of the present invention.
The IC card 1 becomes operable by supplying power from an IC card reader / writer 2 as an external device. The IC card 1 that has become operable performs various processes in response to commands from the IC card reader / writer 2. The IC card reader / writer 2 supplies power for operating the IC card 1 and supplies commands for requesting the IC card 1 to perform various processes.

  Further, the IC card 1 may be a contact-type portable electronic device (contact IC card) that physically communicates with the contact portion of the IC card reader / writer 2 and performs communication. It may be a contactless portable electronic device (non-contact IC card) that communicates with the IC card reader / writer 2 in a non-contact state by a communication unit or the like. Furthermore, the IC card 1 may be a composite IC card (dual interface IC card) having a communication function as a non-contact IC card and a communication function as a contact IC card. The non-contact type IC card and the contact type IC card differ only in the communication method with an external device. For this reason, the processing example to be described later can be similarly applied to a non-contact type IC card or a contact type IC card.

Next, a configuration example of the IC card 1 will be described.
As shown in FIG. 1, the IC card 1 is formed with a module M embedded in a card-like main body B. The module M is integrally formed in a state where one or a plurality of IC chips 10 and the interface 11 are connected. The IC chip 10 includes a CPU (central processing unit) 101, a data memory 102, a RAM 103, a ROM 104, a communication control unit 106, a power supply unit (not shown), and the like. The communication control unit 106 of the IC chip 10 is connected to the interface 11.

  The CPU 101 controls the entire IC card 1. The CPU 101 operates based on a control program and control data stored in the ROM 104 or the data memory 102. By executing the control program as described above, the CPU 101 functions as a processing unit that performs various processes.

  The data memory 102 is a rewritable nonvolatile memory. The data memory 102 is composed of an erasable (rewritable) nonvolatile memory such as an EEPROM (Electrical Eraseable and Programmable Read Only Memory) or a flash ROM. In the data memory 102, various information corresponding to the purpose of use of the IC card 1 is stored. For example, the data memory 102 stores application data for realizing various functions. The data memory 102 stores various data stored in a file. The file structure in the data memory 12 is based on, for example, ISO / IEC7816-4.

  The RAM 103 is a volatile memory that can be accessed at high speed. The RAM 103 functions as a buffer memory for temporarily storing data. For example, the RAM 103 functions as a buffer memory that temporarily stores data transmitted and received in communication processing with the IC card reader / writer 2. The RAM 103 also functions as a working memory that temporarily holds data being processed by the CPU 101.

  The ROM 104 is a non-rewritable nonvolatile memory. The ROM 104 is composed of a read-only memory such as a mask ROM (read-only memory). The ROM 104 functions as a program memory in which a control program executed by the CPU 101 is stored. In particular, the ROM 104 stores a control program and control data for performing basic operations according to the specifications of the IC card 1. For example, the ROM 104 stores a control program for the CPU 101 to execute processing according to a command given from outside.

  The communication control unit 106 controls data communication with the IC card reader / writer 2 via the interface 11. For example, when the IC card 1 is a contact IC card, a contact communication function is realized by a contact unit as the interface 11 and a communication control circuit as the communication control unit 106. When the IC card 1 is composed of a non-contact type IC card, a non-contact type communication function is realized by an antenna as the interface 11 and a modulation / demodulation circuit as the communication control unit 106.

  In the IC card 1 configured as described above, when a command for requesting data writing to the data memory 102 is given from the IC card reader / writer 2, the CPU 101 executes a control program stored in the ROM 104 or the like. By executing this, a process of writing data to the data memory 102 is executed. When the IC card reader / writer 2 gives a command for requesting reading of data stored in the data memory 102, the CPU 101 executes the control program stored in the ROM 104, whereby the data A process of reading data from the memory 102 is executed. Further, the IC card 1 realizes various processes according to the use by the CPU 101 executing a processing program installed according to the use of the IC card 1 or the like.

  FIG. 2 is a diagram illustrating an external configuration example of a contact IC card as one form of the IC card 1. As shown in FIG. 2, the contact IC card is formed so that the contact portion as the interface 11 is exposed on the surface of the main body B. In the contact IC card, a module M having one or a plurality of IC chips C connected to the contact portion exposed on the surface is built in a card-like main body B. The contact portion as the interface 11 in the contact IC card has a plurality of terminals as shown in FIG. For example, the contact portion includes terminals such as a supply voltage terminal Vcc, a ground terminal GND, a reset terminal RST, an input / output terminal I / O, and a clock terminal CLK.

  FIG. 3 is a diagram illustrating a configuration example of a non-contact type IC card as one form of the IC card 1. As shown in FIG. 3, in a non-contact type IC card, a module M having one or a plurality of IC chips C and an antenna as an interface 11 as shown by a dotted line is embedded in a card-like main body B. ing. Thereby, in the non-contact type IC card, the radio wave transmitted and received by the antenna is processed by the IC chip C.

Next, the configuration of the file stored in the data memory 102 will be described.
FIG. 4 is a diagram schematically showing a configuration example of a file stored in the data memory 102.
As shown in FIG. 4, in the data memory 102 in the IC card, various files are managed in a hierarchical structure with the master file (MF) as the highest hierarchy. In the example shown in FIG. 4, two elementary files (EF) EF <b> 1 and EF <b> 2 exist in the layer next to the master file MF that is the highest layer. Note that a DF file may be defined in the next layer of the master file MF, and an elementary file may be defined in the next layer of the DF file.

  The elementary files EF1 and EF2 are data files for storing actual data. That is, in the data memory 102, actual data is stored in an elementary file as shown in FIG. In other words, in the data memory 102, actual data is managed for each elementary file. Therefore, when accessing actual data, it is necessary to select an elementary file.

Next, the configuration of data in the elementary file (data file) will be described.
FIG. 5A and FIG. 5B are diagrams schematically illustrating a configuration example of data in the data file. Here, FIG. 5A shows a configuration example of data 1 in the elementary file EF1 shown in FIG. 4, and FIG. 5B shows a configuration example of data 2 in the elementary file EF2 shown in FIG. Suppose. Further, elementary files (data files) as shown in FIGS. 5A and 5B are stored in a data storage area provided in the data memory 102.

In the elementary file EF1 shown in FIG. 5A and the elementary file EF2 shown in FIG. 5B, actual data is stored as 254 records having record numbers “1” to “254”. In this way, a structure in a file in which data is stored as a record is referred to as a record structure.
Here, ISO / IEC7816-4, which is an international standardization standard for IC cards, defines the following structure as a data structure in an elementary file.

(F1) Transparent structure
(F2) Fixed-length sequential record structure (Linear structure with records of fixed size): A structure in which fixed-length records are arranged in order in a data file. In this type of data file, for example, fixed-length records are added in order.
(F3) Variable length sequential record structure (Linear structure with records of variable size): A structure in which variable length records are arranged in order in a data file. In this type of data file, for example, variable-length records are added in order.
(F4) Cyclic structure with records of fixed size: A structure in which fixed-length records are arranged in a data file so as to circulate. In this type of data file, for example, a fixed-length record is added (rewritten) so as to circulate.
(F5) TLV structure: each record in the data file is composed of a tag, a length, and a value.

  In the above (F1), the data structure is not a record structure but a transparent structure. In the above (F2) to (F5), the data structure is a record structure. That is, in ISO / IEC7816-4, structures (F2) to (F5) are defined as elementary files (data files) having a record structure. In the data file having the record structure as described above (F2) to (F5), actual data is stored in each record. However, ISO / IEC 7816-4 stipulates that the upper limit value of the number of records that can be stored in each data file is “254” (record numbers “1” to “254”). Therefore, a new record cannot be stored in the data file in which the records with the record numbers “1” to “254” are stored like the elementary files EF1 and EF2 shown in FIG. 4 (actual data). Cannot be provided with a record for storing

Next, access to a data file having the above record structure will be described.
As described above, the IC card 1 operates in response to a command from an external device. Therefore, access control to the data file can be described as processing for a command. Therefore, here, a command for requesting access to a data file having a record structure will be described.

For example, in ISO / IEC7816-4, the following commands are defined as commands for requesting access to a data file having a record structure.
(C1) READ RECORD (S) Command
(C2) WRITE RECORD Command
(C3) APPEND RECORD Command
(C4) SEARCH RECORD Command
(C5) ERASE RECORD (S) Command
Of the commands (C1) to (C5) described above, commands other than the APPEND RECORD Command of (C3) can specify the record number to be accessed by the command. However, as described above, ISO / IEC 7816-4 assumes that the upper limit value of the number of records that can be stored in each data file is “254”. For this reason, in ISO / IEC7816-4, the record numbers that can be specified by the above commands are from "01" to "FE" in hexadecimal (that is, record numbers "1" to "254" in decimal). Yes.

  On the other hand, in APPEND RECORD Command (C3), access can be requested without specifying the record to be accessed by the record number. In such APPEND RECORD Command, it is often used as a command for sequentially recording a specific type of data (for example, history information indicating a series of processing contents). In general, a data file in which history information is sequentially recorded (that is, a data file in which appending of data is requested by the APPEND RECORD Command) is an upper limit value of the number of records assumed in ISO / IEC7816-4. It is thought that a situation exceeding That is, in a data file in which data is appended in order using the APPEND RECORD Command, if the upper limit of the number of records can be expanded, the efficiency of data management can be improved.

  In the IC card of this embodiment, the number of records that can be stored in a specific data file can be expanded. Here, the specific data file does not necessarily indicate that it is physically one data file. The specific data file includes a plurality of files that are recognized as one data file by an external device such as the IC card reader / writer 2. For example, as will be described later, it is considered that two data files having the same file identification information are recognized as one data file (specific data file) from the external device.

Next, the management mode of the elementary files will be described.
FIG. 6 is a diagram illustrating a configuration example of definition information (management information) for managing elementary files. FIG. 6 shows an example of file management information of the elementary file EF1 shown in FIG. 5A and the elementary file EF2 shown in FIG. 5B. The file management information as shown in FIG. 6 is stored in a storage area for management information provided in the data memory 102.

  As shown in FIG. 6, the file management information of each file includes file identification information (Short EF identifier), file type information, record length information, maximum record number information, usage order information, and the like. The file identification information is identification information for identifying a file. Each data file is specified by the file identification information. Therefore, the external device recognizes a plurality of files having the same file identification information as one file.

  The file type information stores information indicating the data structure in the file. For example, the file type information is information indicating any one of (F2) to (F5) described above when the data structure in the file is a record structure. The record length information is information indicating the size of each record in the file. The maximum record number information is information indicating the maximum number of records that can be stored in the file. The use order information is information indicating the use order of the file. The usage order information is set when there are a plurality of files having the same file identification information.

  In the present embodiment, it is assumed that the information other than the usage order information is the same in the file management information of a plurality of files having the same file identification information. In the present embodiment, it is assumed that the use order information is set to an integer value in order from “1” for each file of the same file identification information. For example, when there are two files having the same file identification information, the usage order information for one file is set to “1”, and the usage order information for the other file is set to “2”.

  In the example illustrated in FIG. 6, the file management information of the elementary file EF1 includes file identification information “01”, file type information “variable-length sequential record structure”, record length “100 bytes”, and the maximum number of records. “254” and the use order information is “1”. The file management information of the elementary file EF2 includes file identification information “01”, file type information “variable length sequential record structure”, record length “100 bytes”, maximum number of records “254”, and usage. The rank information is “2”.

  As shown in FIG. 6, the elementary file EF1 and the elementary file EF2 are files that differ only in use order information. These files are physically two files, but are logically handled as one file. That is, in a state where the file having the file identification information “01” is selected, either the elementary file EF1 or the elementary file EF2 is actually accessed in the order set by the usage order information.

Next, a processing example in the IC card 1 as described above will be described.
First, a flow of processing for APPEND RECORD Command (C3) will be described as a first processing example in the IC card 1.
FIG. 7 is a flowchart for explaining the flow of processing for the APPEND RECORD Command (C3) in the IC card 1. In the following description, a file (current file) to be accessed by the APPEND RECORD Command (C3) is an elementary file having a variable length sequential record structure having file identification information “01” as shown in FIG. Suppose that Further, it is assumed that the data (additional data) to be additionally recorded by the APPEND RECORD Command has a size that can be stored as a record in the file having the file identification information “01”. Furthermore, it is assumed that there is no need for a security condition for appending data with the APPEND RECORD Command.

  The IC card 1 is activated upon receiving power supply from the IC card reader / writer 2. The activated IC card 1 can receive commands from the IC card reader / writer 2. In this state, the IC card 1 receives a command from the IC card reader / writer 2. When a command is received from the IC card reader / writer 2, the CPU 101 of the IC card 1 performs a process for determining the command. In this case, the CPU 101 determines that the command received by the process of determining the command is an APPEND RECORD Command. When it is determined that the command received from the IC card reader / writer 2 is the APPEND RECORD Command, the CPU 101 of the IC card 1 executes the process shown in FIG.

  In other words, when the APPEND RECORD Command is received, the CPU 101 performs file management including file identification information of a currently selected file (current file) from a plurality of file management information stored in the data memory 102. Information is searched (step S1). If it is determined by this search process that there is no file management information having the file identification information of the current file (step S2, NO), the CPU 101 indicates that there is no file error as a processing result for the APPEND RECORD Command. A response (response) shown is transmitted to the IC card reader / writer 2, and the process for the APPEND RECORD Command is terminated as an error (step S3).

If it is determined that there is file management information having the file identification information of the currently selected file in the search process (step S2, YES), the CPU 101 stores the file management information having the same file identification information as the current file. It is determined whether or not there are a plurality (step S4).
If it is determined by this determination that there are a plurality of file management information having the same file identification information as the current file (step S4, YES), the CPU 101 uses the highest usage order information among the file management information. This file management information file is selected as an access target file (step S5). If there is only one file management information having the file identification information of the current file (step S4, NO), the CPU 101 selects the file of the file management information as an access target file.

  For example, as shown in FIG. 6, when there are a plurality of file management information having file identification information “01”, the CPU 101 determines that the file identification information of the selected file is “01”, the above step S1. As the processes in .about.S5, the file having the file identification information “01” and the usage order information “01” is selected as the access target file.

  When there is only one file management information having file identification information of the current file, only one file can be selected as a file to be accessed by the APPEND RECORD Command. In this case, in the processing flow shown in FIG. 7, the file may be processed with the usage order “01”.

  When a file to be accessed is selected by the above process, the CPU 101 determines whether a new record can be added to the selected file (step S6). In other words, in step S <b> 6, the CPU 101 performs a process of determining whether or not a free recordable record (empty area) exists in the selected file.

  For example, when the maximum number of records that can be stored in one file is 254, the CPU 101 performs the processing of step S6 in the file whose usage order information is “01” in record numbers “1” to “254”. It is determined whether or not “254” records have been written.

  When it is determined that a new record can be added to the selected file by the above determination (step S6, YES), the CPU 101 adds the data to be added (additional data) specified in the received APPEND RECORD Command. A process of writing as a new record in the file is performed (step S7). When the data writing process of such additional data is successful (step S8, YES), the CPU 101 transmits a response indicating normal termination to the IC card reader / writer 2 as a processing result for the APPEND RECORD Command, and performs the process. finish. If the data write of the additional data has failed (step S8, NO), the CPU 101 transmits a response indicating the data write failure to the IC card reader / writer 2 as a processing result for the APPEND RECORD Command. The process for APPEND RECORD Command is terminated with an error (step S9).

  If it is determined that a new record cannot be added to the selected file by the above determination (step S6, NO), the CPU 101 determines that the file identification information is the same as the file identification information of the selected file and has a use order. The file management information that is the next of the selected file is searched (step S10).

  For example, as shown in FIG. 6, when there are a plurality of file management information having file identification information “01”, the CPU 101 determines that the file identification information of the selected file is “01” and the usage order information. Is “01”, as the processing of step S10, the file having the file identification information “01” and the usage order information “02” is selected as the access target file.

  If it is determined by the search process that a file having the next usage order does not exist (step S11, NO), the CPU 101 sends a response (response) indicating an error to the IC card reader / writer 2 because there is no empty record. It transmits, and it is set as an error end (Step S12). In the process of step S12, since the maximum number of records are already stored in the selected file identification information file, the APPEND RECORD Command indicates that data cannot be added (that is, a record cannot be added). Is a process of notifying the sender of the message.

  When the next usage order file is detected by the search process (step S11, YES), the CPU 101 selects the detected next usage order file as an access target file, and is the same as step S6. Then, it is determined whether or not a new record can be added to the selected file (step S13).

  When it is determined that a new record can be added to the selected file by the above determination (step S13, YES), the CPU 101 adds the data to be added (added data) specified in the received APPEND RECORD Command. A process of writing as a new record in the file is performed (step S7). When the data writing process of such additional data is successful (step S8, YES), the CPU 101 transmits a response indicating normal termination to the IC card reader / writer 2 as a processing result for the APPEND RECORD Command, and performs the process. finish. If the data write of the additional data has failed (step S8, NO), the CPU 101 transmits a response indicating the data write failure to the IC card reader / writer 2 as a processing result for the APPEND RECORD Command. The process for APPEND RECORD Command is terminated with an error (step S9).

  If it is determined that a new record cannot be added to the file selected by the determination (step S13, NO), the CPU 101 returns to step S10 and repeatedly executes the above-described processing. For example, when the maximum number of records (all records from record numbers “1” to “254”) are stored in the file having the usage order information “2”, the CPU 101 returns to step S10, and further Then, a process of searching for the file definition information whose use order information which is the next use order is “3” is performed.

  As described above, when the IC card receives the APPEND RECORD Command, the IC card searches for file management information having usage order information with the usage order being first among the file management information having file identification information of the current file. When the file management information with the first usage order is detected, the IC card determines whether there is an empty record in the file defined by the file management information with the first usage order. If it is determined that there is no empty record in the file with the first use rank, the IC card re-searches the file management information having the use rank information with the second use rank. When the usage order information with the second usage rank is detected, the IC card determines whether there is an empty record in the file defined by the usage rank information with the second usage rank. If it is determined that there is an empty record in the file with the second highest usage order, the IC card writes data to the empty record in the file with the second highest usage order.

  That is, when there is no empty record in the file with the first usage order, the IC card that has received APPEND RECORD Command appends data to the empty record in the file with the second highest usage order. By such processing, the IC card can write more records than the specified maximum number of records in one file as records accessible by one file identification information. A plurality of files having the same file identification information are recognized as one file by the external device that is the command transmission source. Therefore, from an external device, a record exceeding the specified maximum number of records can be written to the current file of the IC card with a specified command.

Next, a flow of processing for the READ RECORD Command (C1) will be described as a second processing example in the IC card 1.
FIG. 8 is a flowchart for explaining the flow of processing for the READ RECORD Command (C1) in the IC card 1.
In the READ RECORD Command (C1), as a method of designating a record of data to be read out with respect to a data file having a record structure, a method of designating a record number, a method of designating a record before or after the current record, There is. Note that information indicating the current record is held in a memory such as the RAM 103, for example, and is updated as needed as each record is accessed.

  In the following description, the file (current file) to be accessed in the READ RECORD Command (C1) is an elementary file having a variable-length sequential record structure having file identification information “01” as shown in FIG. Shall. Furthermore, it is assumed that the data to be read by the READ RECORD Command is a command requesting to read the next record based on the current record. The processing for the read command for requesting batch reading from the designated record to the last record in the file having the highest usage order, or the read command for requesting batch reading from the current record to the last record is performed on the data of each record. Can be realized by repeatedly executing a process as shown in FIG.

  The IC card 1 is activated upon receiving power supply from the IC card reader / writer 2. The activated IC card 1 can receive commands from the IC card reader / writer 2. In this state, the IC card 1 receives a command from the IC card reader / writer 2. When a command is received from the IC card reader / writer 2, the CPU 101 of the IC card 1 performs a process of determining the received command. In this case, the CPU 101 determines that the command received by the process of determining the command is the READ RECORD Command. When it is determined that the command received from the IC card reader / writer 2 is the READ RECORD Command, the CPU 101 of the IC card 1 executes a process as shown in FIG.

  That is, when the READ RECORD Command is received, the CPU 101 determines from the plurality of file management information stored in the data memory 102 the file management information having the file identification information of the currently selected file (current file). Information is searched (step S21). If it is determined by this search process that there is no file management information having file identification information of the current file (step S22, NO), the CPU 101 indicates that there is no file error as a processing result for the READ RECORD Command. A response (response) shown is transmitted to the IC card reader / writer 2, and the processing for the READ RECORD Command is terminated as an error (step S23).

If it is determined in the search process that file management information having file identification information of the currently selected file exists (step S22, YES), the CPU 101 has the same file identification information as the currently selected file. It is determined whether or not there are a plurality of pieces of file management information of correct file identification information (step S24).
When it is determined by this determination that there are a plurality of file management information having the same file identification information as the current file (step S24, YES), the CPU 101 uses the highest order of usage information among the file management information. This file management information file is selected as an access target file (step S25). If there is only one file management information having file identification information of the current file (step S24, NO), the CPU 101 selects the file of the file management information as an access target file.

  For example, as shown in FIG. 6, when there are a plurality of file management information having file identification information “01”, the CPU 101 determines that the file identification information of the current file is “01”. As a process, a file having file identification information “01” and use order information “01” is selected as a file to be accessed.

  When there is only one file management information having file identification information of the current file, only one file can be selected as a file to be accessed by the READ RECORD Command. In this case, in the processing flow shown in FIG. 8, the file may be processed with the usage order “01”.

  When a file to be accessed is selected by the processing as described above, the CPU 101 acquires information indicating the current record from the RAM 103. The CPU 101 determines the record number of the record designated by the READ RECORD Command based on the information indicating the current record acquired from the RAM 103 (step S26). That is, when the READ RECORD Command specifies the next record of the current record, the CPU 101 specifies the next record of the current record based on the information indicating the current record acquired from the RAM 103.

  For example, the current record may be indicated by a combination of a record number in each file and information indicating the usage order of each file, or a serial number may be assigned to all records in each file. However, in the present embodiment, it is assumed that the command is operated within a limit defined by a predetermined standard (an existing command is used without changing the specification). For this reason, in the command, it is not possible to directly specify a record in a file whose usage order information is “2” or later. However, since the information indicating the current record is information held in the IC card, records in files whose usage order is “2” or later can also be held as the current record. For example, the information indicating the current record includes the record number of each record in the file whose usage order is “n” from “1+ (maximum number of records in each file) × (n−1)” to “maximum number of records + (each file The maximum number of records) × (n−1) ”can be defined. In this case, it is determined that the record number next to the current record is the current record number + 1.

  When determining the record number specified in the READ RECORD Command (the record number next to the current record), the CPU 101 determines that the currently selected file (for example, the file identification number is “01” and the usage order information). It is determined whether or not there is a record with the designated record number in the file “01” (step S27).

  For example, when the record number of each record in the file having the usage order “n” is defined as “1 + 254 × (n−1)” to “254 + 254 × (n−1)”, the CPU 101 determines that the record number is 255. Whether or not the specified record exists in the file having the usage order “1” can be determined based on whether or not the above is true. When the determined record number is 254 or less, the CPU 101 determines whether or not the designated record number exists in the file having the usage order “01”.

  When it is determined that the specified record exists in the file selected by the determination (step S27, YES), the CPU 101 performs a process of reading the data of the record number specified by the received READ RECORD Command ( Step S28). When such data reading process is successful (step S29, YES), the CPU 101 returns the read data and information indicating normal end to the IC card reader / writer 2 as a response as a processing result for the READ RECORD Command. Send and finish the process.

  If the data reading process fails (step S29, NO), the CPU 101 transmits a response indicating the data reading failure to the IC card reader / writer 2 as a processing result for the READ RECORD Command, and reads the READ. The process for the RECORD Command is terminated as an error (step S30).

  Further, when it is determined that the specified record does not exist in the file selected by the determination (step S27, NO), the CPU 101 has the same file identification information as the current file and the next use order. File management information is searched (step S31).

  For example, as shown in FIG. 6, when there are a plurality of file management information having file identification information “01”, the CPU 101 determines that the file identification information of the selected file is “01” and the usage order information. If “01”, as the processing in step S31, a file having the file identification information “01” and the usage order information “02” is selected as the access target file.

  If it is determined by the search process that a file with the next usage order does not exist (step S32, NO), the CPU 101 sends a response (response) indicating an error because there is no designated record to the IC card reader / writer. 2 to end the error (step S33). The process of step S33 is a process of transmitting a response indicating that the selected file exists but the specified record does not exist in the selected file.

  If the next usage order file is detected by the search process (step S32, YES), the CPU 101 selects the detected next usage order file as the file to be accessed, and is the same as step S27. Then, it is determined whether or not the designated record exists in the selected file (step S34).

  When it is determined that the specified record exists in the file selected by the determination (step S34, YES), the CPU 101 proceeds to step S28 and performs a process of reading the data of the specified record. When the data reading process is successful (step S29, YES), the CPU 101 transmits the read data and information indicating normal end to the IC card reader / writer 2 as a response, and ends the process. If the data reading fails (step S29, NO), the CPU 101 transmits a response indicating the data reading failure to the IC card reader / writer 2 and terminates the processing for the READ RECORD Command as an error end (step). S30).

  If it is determined that the specified record does not exist in the file selected by the determination (step S34, NO), the CPU 101 returns to step S31 and repeatedly executes the above-described processing. As a result, the CPU 101 can perform a process of searching for a designated record from a file having the same file identification information as the current file in the order of use.

  As described above, when the IC card of the present embodiment receives the READ RECORD Command, the file management having the usage order information that uses the first place among the file management information having the file identification information of the current file. Search for information. When the file management information with the first usage order is detected, the IC card determines whether there is a record to be read in the file defined by the file management information with the first usage order. When it is determined by this determination that there is no record to be read in the file with the first usage rank, the IC card re-searches the file management information having the usage rank information with the second usage rank. When the usage order information with the second usage order is detected, the IC card determines whether there is a record to be read in the file defined by the usage order information with the second usage order. If it is determined by this determination that there is a record to be read in the file with the second highest usage order, the IC card reads the data of the record to be read in the second highest priority file.

  In other words, the IC card that has received the READ RECORD Command also reads out the record data in the second and subsequent files by determining whether there is a record to be read from each file in the order of use. Is possible. By such processing, the IC card can read out a desired record even when the record accessible by one file identification information exceeds the prescribed maximum number of records in one file.

  In the READ RECORD Command, it is possible to specify a record to be read with reference to the current record. For example, in the READ RECORD Command, it is possible to specify a record to be read as a record next to the current record. Information indicating the current record is information held in the IC card. For this reason, in the IC card, it is possible to set a record in a file whose usage order is second or higher as the current record. In other words, even in an external device that recognizes a plurality of files having the same file identification information in an IC card as one file, by specifying a record to be read based on the current record, a predetermined standard can be used. It is possible to request reading of record data in a file whose usage order is second or higher without changing the specification of the specified READ RECORD Command.

  As described above, in the present embodiment, for example, the specification of the APPEND RECORD Command or the READ RECORD Command specified in a predetermined standard such as the international standard ISO / IEC7816-4 is not changed, and the maximum in the standard is changed. Records exceeding the record number “254”, which is a value, can be managed with one file identification information.

  The embodiment described above does not limit the number of usage orders, the maximum number of records in each file, the file type, and the like. That is, any number of files can be defined as file management information that differs only in the order of use. For example, when ten files differing only in the use order are defined, values “1” to “10” are sequentially set as the use order information in the file definition information. Further, the maximum number of records is not limited to “254”, but can be applied to any number. As the file type, any of the above embodiments can be applied as long as the file has a record structure. For example, the above embodiment can be applied to a file having a structure other than the variable length sequential record structure.

The block diagram which shows roughly the structure of the IC card as a portable electronic device. The figure which shows the structural example of a contact-type IC card. The figure for demonstrating the structural example of a non-contact-type IC card. The schematic diagram which shows the structural example of the file in a data memory. The figure which shows typically the structural example of the data stored in the file. The figure which shows typically the structural example of the data stored in the file. The figure which shows the structural example of file management information typically. The flowchart for demonstrating the flow of a process with respect to an append record command. The flowchart for demonstrating the flow of a process with respect to a read record command.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... IC card (portable electronic device), 2 ... IC card reader / writer (external device), 10 ... IC chip, M ... Module, B ... Main body, 11 ... Interface, 12 ... Data memory, 101 ... CPU, 102 ... Data memory, 103... RAM, 104... ROM, 106.

Claims (13)

A first memory for storing file-unit data;
A second memory for storing a plurality of file management information having the same file identification information and different usage order information set;
When the command is given from the external device, the first file defined by the file management information of the usage order information that has the first usage order among the file management information having the file identification information of the file to be accessed A first access determination unit that determines whether or not to be an access target;
When the first determination unit determines that the first file is not an access target, the usage order information indicates that the usage order is second among the file management information having the file identification information of the file to be accessed. A second access determination unit that determines whether or not the second file defined in the file management information is to be accessed;
A processing unit that performs processing according to a command on a file determined to be an access target by the first or second access determination unit;
A portable electronic device comprising: The command is an additional write command for requesting additional data,
The first access determination unit determines whether or not the first file is to be accessed based on whether or not there is a free area for adding data to the first file,
The second access determination unit determines whether or not the second file is to be accessed depending on whether or not there is a free area for adding data to the second file.
The portable electronic device according to claim 1, wherein the portable electronic device is a portable electronic device. The file to be accessed is a file having a record structure,
The first access determination unit determines whether or not the first file is to be accessed according to whether or not there is an empty record for storing data in the first file,
The second access determination unit determines whether or not the second file is to be accessed depending on whether or not there is an empty record for storing data in the second file.
The portable electronic device according to claim 1, wherein the portable electronic device is a portable electronic device. The command is a read command for requesting reading of data,
The first access determination unit determines whether or not the first file is to be accessed according to whether or not a storage area for data to be read exists in the first file,
The second access determination unit determines whether or not the second file is to be accessed depending on whether or not a storage area for data to be read exists in the second file.
The portable electronic device according to claim 1, wherein the portable electronic device is a portable electronic device. The file to be accessed is a file having a record structure,
The first access determination unit determines whether or not the first file is to be accessed depending on whether or not there is a record storing data to be read in the first file,
The second access determination unit determines whether or not the second file is to be accessed based on whether or not there is a record in which data to be read is stored in the second file.
The portable electronic device according to claim 1, wherein the portable electronic device is a portable electronic device. Furthermore, it has the 3rd memory which memorizes the information which shows the current record,
The command is a read command in which a record from which data is to be read is specified based on the current record,
The first access determination unit identifies a record designated by the read command with reference to a current record stored in the third memory, and the identified record exists in the first file. Whether or not the first file is to be accessed according to whether or not
The second access determination unit specifies a record designated by the read command based on a current record stored in the third memory, and the specified record exists in the second file. It is determined whether or not the second file is to be accessed depending on whether or not
The portable electronic device according to claim 5, wherein: A file management method for a portable electronic device, comprising:
Store file unit data in the first memory,
A plurality of file management information having the same file identification information and different usage order information set is stored in the second memory,
When the command is given from the external device, the first file defined by the file management information of the usage order information that has the first usage order among the file management information having the file identification information of the file to be accessed Whether or not to access
When it is determined that the first file is not to be accessed, it is defined by the file management information of the usage order information in which the usage order is second among the file management information having the file identification information of the file to be accessed. To determine whether the second file is to be accessed,
Processing according to the command is performed on the file determined to be the access target by the determination.
A file management method for a portable electronic device. The command is an additional write command for requesting additional data,
Whether or not the first file is to be accessed is determined by whether or not the first file is to be accessed depending on whether or not there is a free area in the first file for adding data. Determine whether
Whether or not the second file is to be accessed is determined by whether or not the second file is to be accessed depending on whether or not there is a free area in the second file for adding data. To determine,
The file management method for a portable electronic device according to claim 7, wherein the file management method is a portable electronic device. The file to be accessed is a file having a record structure,
Whether the first file is to be accessed is determined based on whether there is an empty record for storing data in the first file. Determine whether or not
Whether the second file is to be accessed is determined based on whether there is an empty record for storing data in the second file or not. Determine whether or not
The file management method for a portable electronic device according to claim 7, wherein the file management method is a portable electronic device. The command is a read command for requesting reading of data,
Whether or not the first file is to be accessed is determined by whether or not the first file is to be accessed depending on whether or not a storage area for data to be read exists in the first file. Determine
Whether or not the second file is to be accessed is determined by whether or not the second file is to be accessed depending on whether or not a storage area for data to be read exists in the second file. Determine
The file management method for a portable electronic device according to claim 7, wherein the file management method is a portable electronic device. The file to be accessed is a file having a record structure,
Whether or not the first file is to be accessed is determined based on whether or not there is a record storing data to be read in the first file. Whether or not
Whether or not the second file is to be accessed is determined based on whether or not there is a record storing data to be read in the second file. Whether or not
The file management method for a portable electronic device according to claim 7, wherein the file management method is a portable electronic device. Further, information indicating the current record is stored in the third memory,
The command is a read command in which a record from which data is to be read is specified based on the current record,
Whether the first file is to be accessed is determined by specifying the record specified by the read command based on the current record stored in the third memory, and the specified record is It is determined whether or not the first file is to be accessed according to whether or not it exists in the first file,
The determination as to whether or not the second file is to be accessed is performed by specifying the record specified by the read command based on the current record stored in the third memory, and the specified record is Whether or not the second file is to be accessed is determined based on whether or not it exists in the second file.
The file management method of the portable electronic device according to claim 11, wherein the file management method is a file management method. A command is given from an external device, a first memory that stores data in units of files, a second memory that stores a plurality of file management information having the same file identification information and different usage order information, and If the first file defined in the file management information of the usage order information that has the first usage order among the file management information having the file identification information of the file to be accessed, is the access target? A first access determination unit that determines whether or not the file management information includes file identification information of a file to be accessed when the first determination unit determines that the first file is not an access target The second file defined in the file management information of the usage order information that has the second highest usage order is the access target. A second access determination unit that determines whether or not, and a processing unit that performs a process according to a command on a file determined to be an access target by the first or second access determination unit When,
A main body containing the module,
IC card characterized by that.

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