JP4790308B2 - Information processing system, information processing apparatus, information processing method, and computer program - Google Patents

Description

  The present invention relates to a memory area access method, and more particularly to an information processing system that transmits and receives data of a file system having memory area identification codes having different code lengths.

  For example, when an IC card or a portable information terminal incorporating an IC chip has a memory area with a hierarchical structure having an area (area) and an application area (service) as shown in FIG. Can identify the access target by specifying the identification code assigned to each area. The area corresponds to a so-called folder having a hierarchical structure, and the area can be specified by a start code (area code) and an end code (end service code) indicating a range in the memory area. The service corresponds to a so-called file, and the service can be specified by a code (service code) for identifying the position in the memory area.

  Conventionally, an identification code for identifying the inside of a memory area such as an area code and a service code has been represented by a certain code length (for example, 2 bytes). Therefore, when a file in the memory area is read or data is written by an external device, the range or position in the memory area is specified by an area code or service code having a 2-byte code length. It was.

  The service code is assigned to each service provided to the user, and data for providing the service by the service provider is stored in an application area (service) identified by the service code. In recent years, with the spread of IC cards and portable information terminals incorporating IC chips, it has been necessary to increase the number of service codes assigned to each service in order to provide services by more service providers. For example, by changing the code length of the memory area identification code for identifying the memory area from 2 bytes to 4 bytes, it becomes possible to add a service code that can be assigned to the service provider.

JP 2000-36021 A

  However, as described above, when a service code is added by extending the code length, there are systems having area codes and service codes having different code lengths. In a system that transmits and receives data using an IC card or the like, the identification code length for identifying a memory area transmitted from an external device is constant. Therefore, compatibility of file systems having memory area identification codes with different code lengths is ensured. There was a problem that it could not be secured.

  Accordingly, the present invention has been made in view of such problems, and the object of the present invention is to ensure compatibility of file systems having memory area identification codes having different code lengths and to specify designated memory areas. It is an object to provide a new and improved information processing apparatus, information processing system, information processing method, and computer program capable of correctly accessing a computer.

  In order to solve the above problem, according to an aspect of the present invention, there is provided an information processing system in which an external device that transmits a command packet and an information processing device that receives the command packet can communicate in a non-contact manner; The processing device is divided into a plurality of areas, a memory area to which a memory area identification code for identifying each divided area is assigned, and a code length of a memory area retrieval code for retrieving the divided memory area A command packet dividing unit that divides the received command packet into a memory area search code and write data to be written in a memory area corresponding to the memory area identification code, based on the code length determination information set in advance; The code length of the memory area search code divided by the above is compared with the code length of the memory area identification code. Code length comparing and judging section and which, according to the judgment result of the code length comparator determining unit, a code length converter for converting memory area search code length; characterized in that it comprises the information processing system is provided.

  The information processing apparatus may be configured by a non-contact type IC card incorporating an IC chip, and the external device may be a reader / writer apparatus capable of non-contact communication with the non-contact type IC card.

  According to the above configuration, even when a memory area search code having a code length different from the code length of the memory area identification code is transmitted by an external device, it is possible to ensure compatibility and to search the memory area correctly. Become. Further, the memory area search code and the write data included in the command packet are divided according to the preset code length determination information, and the code length of the divided memory area search code and the code length of the memory area identification code are different. If so, the code length of the memory area search code is converted. As a result, even if the memory area search code is not converted by an external device, it is possible to ensure compatibility between the memory area identification code having a different code length and the memory area search code.

  In order to solve the above-described problem, according to another aspect of the present invention, an information processing apparatus capable of communicating in a non-contact manner with an external device that transmits a command packet; A memory area to which a memory area identification code for identifying each area is assigned; and reception based on code length determination information set in advance to determine the code length of the memory area search code for searching the divided memory areas A command packet dividing unit for dividing the command packet into a memory area search code and write data to be written to the memory area corresponding to the memory area identification code; a code length of the memory area search code divided by the command packet dividing unit; A code length comparison / determination unit for comparing and determining the code length of the area identification code; , A code length converter for converting memory area search code length; characterized in that it comprises an information processing apparatus is provided.

  According to the above configuration, even when a memory area search code having a code length different from the code length of the memory area identification code is transmitted by an external device, it is possible to ensure compatibility and to search the memory area correctly. Become. Further, the memory area search code and the write data included in the command packet are divided according to the preset code length determination information, and the code length of the divided memory area search code and the code length of the memory area identification code are different. If so, the code length of the memory area search code is converted. As a result, even if the memory area search code is not converted by an external device, it is possible to ensure compatibility between the memory area identification code having a different code length and the memory area search code.

  The code length conversion unit may convert the memory area search code length only when the code length comparison / determination unit determines that the memory area search code length does not correspond to the memory area identification code length. Good. The code length conversion unit extends the memory area search code length to the memory area identification code length when the code length comparison / determination unit determines that the memory area search code length is shorter than the memory area identification code length. You may make it do.

  As a result, the memory area identification code assigned to the memory area is expanded, and even if there are memory area retrieval codes with code lengths before and after expansion, It becomes possible to search the memory area correctly by extending the code length.

  A memory region identification code retrieval unit for retrieving a memory region identification code corresponding to the memory region retrieval code; and a memory region to which the memory region identification code retrieved by the memory region identification code retrieval unit is assigned. And a data writing unit for writing the write data divided by the command packet dividing unit.

  As a result, the memory area to which the memory area identification code is assigned can be searched, and the write data included in the command packet can be correctly written in the memory area.

  A code length determination information receiving unit configured to receive code length determination information transmitted by the external device; and a command packet dividing unit replacing the transmitted code length determination information with preset code length determination information. The command packet may be divided into a memory area search code and write data. As a result, preset coating length determination information can be switched, and the code length of the memory area search code included in the command packet can be designated by the external device.

The memory area is divided into a first area and a second area, and the data writer has a code length of the memory area search code included in the transmitted command packet in the first area. Write data having a code length shorter than the identification code length is written, and the code length of the memory area search code included in the transmitted command packet is the same as the memory area identification code length in the second area. The written data may be written. The code length of the memory area identification code for accessing the divided memory area may be a fixed code length. The code length of the memory area identification code for accessing the divided memory area may be unified with the longest code length of the memory area search code included in the command packet transmitted by the external device.

  As a result, when the memory area identification code is expanded, the memory area identification code is managed with the code length after the code expansion in the memory area, and when the memory area retrieval code before the code expansion is received, the code length It is possible to search the memory area correctly by extending to the extended code length. Therefore, even when systems having command systems with different code lengths are mixed, it is possible to manage the memory area identification code with the maximum code length to ensure compatibility. In addition, memory area identification codes having different code lengths can be managed in one memory space, and data stored in the memory area can be efficiently searched. Furthermore, since only the search process using the code length after the code extension needs to be performed, it is possible to suppress the memory consumption compared to the case of performing the search process for each different code length.

  In order to solve the above-mentioned problem, according to another aspect of the present invention, a code length determination preset to determine a code length of a memory area search code for searching a memory area to which a memory area identification code is assigned is provided. A step of reading information; a step of dividing a command packet received from an external device into a memory area search code and write data to be written in a memory area corresponding to the memory area identification code based on the code length determination information; Comparing the code length of the code with the code length of the memory area identification code; converting the memory area search code length when the memory area search code length does not correspond to the memory area identification code length; There is provided an information processing method characterized by including:

  In order to solve the above problems, according to another aspect of the present invention, a computer is preset to determine a code length of a memory area search code for searching a memory area to which a memory area identification code is assigned. A process of reading the determined code length determination information; and a process of dividing the command packet received from the external device into a memory area search code and write data to be written in the memory area corresponding to the memory area identification code based on the code length determination information A process of comparing and determining the code length of the memory area search code and the code length of the memory area identification code; and if the memory area search code length does not correspond to the memory area identification code length, the memory area search code length is There is provided a computer program characterized in that a process of converting is executed. Further, a computer-readable recording medium in which the computer program is recorded may be provided.

  As described above, according to the present invention, a new and improved system that can ensure compatibility of a file system having memory area identification codes having different code lengths and can correctly access a specified memory area. An information processing apparatus, an information processing system, and an information processing method are provided.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

<1. Overall configuration of information processing system>
First, the overall configuration of the information processing system according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing an overall configuration of an information processing system 10 according to the present embodiment. As shown in FIG. 1, the information processing system 10 includes an information processing apparatus 100 and an external device 200. The information processing device 100 is a device capable of contactless communication with the external device 200, and is, for example, a semiconductor integrated circuit such as an IC card or an IC chip incorporated in a portable information terminal. The external device 200 is an apparatus that can access the information processing apparatus 100, and is, for example, a predetermined reader / writer that writes / reads data to / from the memory area of the information processing apparatus 100. The information processing apparatus 100 can exchange data with the external device 200 in a non-contact manner using electromagnetic waves and the like, and the information processing apparatus 100 is supplied with necessary power by the electromagnetic waves.

  The information processing apparatus 100 includes an antenna 110, a communication unit 120, a CPU 130, a ROM 140, a volatile memory 160 (for example, RAM), a nonvolatile memory 150 (for example, an EEPROM), and the like. The ROM 140 stores a program for executing each function of the information processing apparatus 100 and various data. The RAM 160 temporarily stores data and programs used when executing each function. The EEPROM 150 stores various data for providing a service to the user. The EEPROM 150 is divided into a plurality of areas, and a memory area identification code for identifying each divided area is assigned. The range of the divided area may be indicated by the memory area identification code, or the position in the memory area may be indicated. The CPU 130 achieves each function of the information processing apparatus 100 by executing a program stored in the ROM 140 using data stored in the RAM 160 and the EEPROM 150. The communication unit 120 is a communication interface configured by, for example, a communication line, a communication circuit, a communication device, and the like.

  The external device 200 includes a processor 210, a communication unit 220, an antenna 230, and the like, and a command packet output from the processor 110 is transmitted to the information processing apparatus 100 via the communication unit 220.

  In the present embodiment, the memory area has a hierarchical structure as shown in FIG. 3, and is configured by an area corresponding to a so-called folder having a hierarchical structure and a service corresponding to a so-called file having a hierarchical structure. An area can be specified by a start code (area code) and an end code (end service code) indicating the range in the memory area. The service is specified by a code (service code) for identifying a position in the memory area. The area code, end service code, and service code are examples of a memory area identification code for identifying the memory area of the present invention. The memory area identification code may be a memory space address code. Alternatively, an area name or service name may be assigned to the area or service, and the area name or service name and the memory area identification code may be associated and managed. The association between the area name / service name and the memory area identification code is described in the program, and the program may be read out when searching for the memory area identification code, or the area name / service name and the memory area identification code may be associated with each other. You may make it memorize | store in EEPROM150. A service code is assigned to each service provided to the user, and data for providing the service by the service provider is stored in a memory area identified by the service code. Hereinafter, a range in the memory area indicated by the memory area identification code 2 is referred to as an area, and a memory area indicated by the memory area identification code 1 is referred to as a service.

  Normally, when reading or writing data in a memory area, this service code is specified, data in the memory area identified by the service code is read, or data is written to that memory area. Or For example, when data is written in the memory area, a command packet including a service code and write data is transmitted from the external device 200. The information processing apparatus 100 searches for the service code in the memory area corresponding to the service code included in the command packet, and writes the write data in the memory area identified by the service code.

  As described above, the service code is an identification code assigned for each service provided to the user and used for providing the service by the service provider. In recent years, with the spread of IC cards and portable information terminals incorporating IC chips, it has been necessary to increase the number of service codes assigned to each service in order to provide services by more service providers. For example, by changing the code length of the memory area identification code for identifying the memory area from 2 bytes to 4 bytes, it becomes possible to add a service code that can be assigned to the service provider.

  However, when a service code is added by extending the code length, there are systems having area codes and service codes with different code lengths. The information processing apparatus according to the present invention can ensure correct compatibility and correctly access a memory area designated by the external device 200 even when there are systems having memory area identification codes of different code lengths. It becomes. For example, the code length of the memory area identification code is conventionally 2 bytes, but it is necessary to make the code length 4 bytes in order to increase the service code. In this case, a file system corresponding to the memory area identification code before code expansion and a file system corresponding to the memory area identification code after code expansion are mixed.

  The information processing apparatus according to the present embodiment manages all memory area identification codes with a code length after code expansion (4 bytes) in the memory area. Specifically, “0” is added to the upper byte of the memory area identification code before the memory expansion (2 bytes) so that a 4-byte code is obtained. As a result, identification codes having different byte lengths can be managed in one memory space. Furthermore, when a command packet including a memory area identification code before code expansion (2 bytes) is transmitted from the external device 200, “0” is added to the upper byte of the 2-byte memory area identification code, and the memory It becomes possible to search for the corresponding part in the area. The number of bytes of the memory area identification code included in the command packet can be preset in the EEPROM 150 or designated by the external device 200. The information processing apparatus 100 acquires the memory area identification code from the command packet based on the set code length of the memory area identification code. As described above, in the information processing apparatus 100 according to the present embodiment, even when memory area identification codes having different code lengths are mixed, compatibility is ensured and the corresponding part in the memory area designated by the external device is correctly set. Can be accessed.

  The overall configuration of the information processing system 10 according to the present embodiment has been described above. Next, the functional configuration of the information processing apparatus 100 will be described in detail.

<2. Functional configuration of information processing apparatus>
FIG. 2 is a block diagram illustrating a functional configuration of the information processing apparatus 100. As illustrated in FIG. 2, the information processing apparatus 100 includes a communication unit 120, a determination information reading unit 131, a command packet dividing unit 132, a code length comparison / determination unit 133, a code length conversion unit 134, and a memory area. It comprises an identification code search unit 135, a data writing unit 136, a memory area 151, and the like. Further, the communication unit 120 includes a coat length determination information receiving unit 122, a command packet receiving unit 124, and the like, and the memory area 151 includes a RAM 160, an EEPROM 150, a ROM 140, and the like.

  First, the memory area 151 will be described. The EEPROM 150 is divided into areas and services as described above, and has a hierarchical structure as shown in FIG. For example, the area 1501 (Area 0) corresponds to a so-called folder having a hierarchical structure, and a start code (area code) [00, 00, 10, 00] and an end code (end service code) indicating a range in the memory area [ ff, ff, ff, ff]. Area 1502 (Area 1), area 1505 (Area 2), and area 1506 (Area 3) can also be represented by a start code and an end code, respectively. The upper hierarchical area 1501 includes areas 1502 and 1505. And area 1505 includes area 1506.

  The service 1503 (Service 1) corresponds to a so-called file having a hierarchical structure, and is represented by a service code [00, 00, 10, 08] indicating a position in the memory area. Similarly, the service 1504 (Service 2) is represented by a service code [00, 00, 11, 09], and the service 1507 (Service 3) is represented by a service code [00, 00, 30, 0f].

  The service code is an identification code used for providing a service to the user. The external device 200 can specify a service code, read data stored in a corresponding location in the EEPROM 150, and write data in the corresponding location. As described above, in the present embodiment, all memory area identification codes are managed by the code length after code expansion in the EEPROM 150. For example, the service 1503 had 2 bytes of service code [10, 08] before the code extension, but after the code extension, [00, 00] is added to the upper byte, and [00, 00, 10 , 08].

  That is, as shown in FIG. 5, the area used for a file system having a 2-byte code code system is represented by [00, 00, 00, 00] to [00, 00, ff, ff]. An area 150b, which is used for a file system having a 4-byte code system, is an area 150c represented by [ff, ff, ff, ff] from [00, 00, 00, 00]. However, when an area is specified by a 2-byte code, [00, 00] is always added to the upper byte to expand it to a 4-byte code. Therefore, the area range spans the 2-byte code and 4-byte code. It cannot be specified. In this way, by expanding the 2-byte code to the 4-byte code and managing it, memory area identification codes with different byte lengths can be managed in one memory space, and even if the byte length is increased, backward compatibility Can be maintained.

  The service code specified by the external device 200 may be specified by 2 bytes before code extension or may be specified by 4 bytes after code extension. When a 2-byte service code before code extension is transmitted, a 4-byte service code in the EEPROM 150 can be searched by adding [00, 00] to the upper bytes of the transmitted service code. it can. For example, when data is written in a predetermined area in the EEPROM 150 in response to a request from the external device 200, the command packet 501 shown in FIG. 4 is transmitted. Code length determination information for determining how many bytes the service code included in the command packet is stored in the EEPROM 150 in advance. In addition, the code length determination information stored in the EEPROM 150 may be stored in the RAM 160 when the information processing apparatus 100 is turned on.

  As described above, in the memory area, the memory area identification code is unified and managed by the code length after the code extension, and when the memory area identification code before the code extension is received, it is extended to the code length after the code extension. Can search the memory area correctly. This makes it possible to ensure the compatibility of memory area identification codes with different code lengths without the need for a service provider that provides services to users using the service code to perform code length conversion or the like. . Further, the code length determination information stored in the RAM 160 may be rewritten by transmitting the code length determination information by the external device 200 that transmits the command packet. Thereby, the external device 200 can transmit a command packet having a memory area identification code having a code length different from the code length determination information preset in the EEPROM 160.

  The code length determination information receiving unit 122 receives the code length determination information transmitted from the external device 200 and provides it to the code length determination information reading unit 131. The command packet receiving unit 124 receives the command packet transmitted from the external device 200 and provides the command packet to the command packet dividing unit 132.

  The code length determination information reading unit 131 reads the code length determination information stored in the RAM 160 and provides it to the command packet division unit 132. As described above, the code length determination information stored in the RAM 160 may be set in the EEPROM 150 in advance, or the code length determination information transmitted by the external device 200 may be set. When the code length determination information receiving unit 122 provides the code length determination information, the determination information reading unit 131 provides the code length determination information to the command packet dividing unit 132.

  Based on the code length determination information provided by the code length determination information reading unit 131, the command packet division unit 132 writes the command packet provided by the command packet receiving unit 124 and a memory area search code for searching the memory area. Divide it into data. The external device 200 transmits command packets such as a command packet 501 and a command packet 502 as shown in FIG. For example, when the code length determination information is 2 bytes, [10, 08] is the service code as in the command packet 501. When the code length determination information is 4 bytes, [00, 00, 10, 08] is the service code as in the command packet 502. The service code included in the command packet shown in FIG. 4 is an example of a memory area search code for searching the memory area of the present invention. The memory area search code divided by the command packet dividing unit 132 is provided to the code length comparison / determination unit 133, and the write data is provided to the data writing unit 136.

  The code length comparison / determination unit 133 compares and determines the code length of the memory area search code provided by the command packet division unit 132 and the code length of the memory area identification code assigned to the EEPROM 150. The code length comparison determination unit 133 provides the code length comparison determination result to the code length conversion unit 134. The code length conversion unit 134 converts the code length of the memory area search code included in the command packet in accordance with the result of the code length comparison determination provided by the code length comparison determination unit 133, and searches the converted memory area. The code is provided to the memory area identification code search unit.

  The code length conversion unit 134 may convert the memory area search code length when the memory area search code length and the memory area identification code length are different as a result of the code length comparison determination by the code length comparison determination unit 133. . Specifically, when it is determined that the memory area search code length is shorter than the memory area identification code length, the memory area search code length is extended to the memory area identification code length. For example, as shown in FIG. 4, when the code length of the service code (memory area search code) included in the command packet 501 is 2 bytes and the code length of the memory area identification code is 4 bytes, [00, 00] is added to the upper byte of the 2-byte service code to expand it to 4 bytes. Further, when the code length of the service code (memory area search code) included in the command packet 502 is 4 bytes, the memory area identification code length is 4 bytes and is not converted.

  As described above, the memory area identification codes managed in the EEPROM 150 are unified to a certain code length. Therefore, if the code length conversion unit 134 converts the memory area search code transmitted by the external device 200 to the code length of the memory area identification code (if the code length is the same as the memory area identification code, the conversion is performed). However, it is possible to correctly access the desired memory area without converting the memory area search code length before sending the command packet.

  The memory area identification code search unit 135 searches for a memory area identification code corresponding to the memory area search code provided by the code length conversion unit 134 and provides information on the memory area identification code to the data writing unit 136. For example, when a service code and a service name are associated, the service name may be provided to the data writing unit 136. The data writing unit 136 writes the write data provided by the command packet dividing unit 132 into the memory area to which the memory area identification code provided by the memory area identification code searching unit 135 is assigned.

  The functional configuration of the information processing apparatus 100 has been described above. Next, a process of writing the received command packet data in the memory area in the information processing apparatus 100 will be described with reference to FIG.

<3. Flow of processing in information processing apparatus>
FIG. 6 is a flowchart showing a process of writing received command packet data in the memory area in the information processing apparatus 100. First, the code length determination information stored in the RAM 160 is read (S102). As described above, the code length determination information stored in the RAM 160 may be the code length determination information preset in the EEPROM 150 when the information processing apparatus 100 is turned on, or transmitted before the command packet is transmitted by the external device 200. Code length determination information may be used.

  After reading the code length determination information in step S102, the command packet transmitted by the external device 200 is divided based on the code length determination information read in step S102 (S104). For example, if the code length determination information is 2 bytes, the upper 2 bytes of the command packet are used as a memory area search code, and the other data are used as write data. Thus, by dividing the command packet based on the code length determination information, it is possible to know the code length of the memory area search code and the data length of the write data included in the command packet which is variable data.

  The code length of the memory area search code divided in step S104 is compared with the code length of the memory area identification code assigned to the memory area (S106). If it is determined in step S106 that the memory area search code length is different from the memory area identification code length, the code length of the memory area search code is converted (S108). Specifically, when the memory area search code length is shorter than the memory area identification code length, the memory area search code length is extended to the memory area identification code length. If it is determined in step S106 that the memory area search code length and the memory area identification code length are the same, the process of step S110 is performed without converting the memory area search code length.

  If the memory area search code length is converted in step S108, the converted memory area search code is used. If not converted, the memory area search code divided in step S104 is used. The memory area identification code corresponding to the memory area retrieval code is retrieved (S110). Write data included in the command packet is written in the memory area to which the memory area identification code searched in step S110 is assigned (S112).

  The processing flow of the information processing apparatus 100 has been described above. Next, a method for setting the code length determination information read in the code length determination information reading step (step S102 in FIG. 6) will be described in detail with reference to FIGS.

<4. Setting method of code length determination information>
7 to 9 are flowcharts illustrating a method for setting code length determination information in the information processing apparatus 100. As described above, the code length determination information for determining the code length of the memory area search code included in the command packet may be set in advance in the non-volatile memory (EEPROM) of the information processing apparatus 100 or externally. The code length determination information transmitted by the device 200 may be set. In the following, the code length of the memory area identification code assigned to the memory area is unified to 4 bytes as shown in FIG. 5, and the command packet transmitted from the external device 200 has 2 bytes or 4 bytes. A case where the memory area search code is included will be described. FIG. 7 is a flowchart illustrating setting of code length determination information when the information processing apparatus 100 is turned on.

  First, the information processing apparatus 100 is powered on (S202). In step S202, when the information processing apparatus 100 is powered on, it is determined how many byte codes are specified in the area where the code length determination information of the nonvolatile memory (EEPROM 150) is held (S204). In the nonvolatile memory, information indicating how many bytes the code length of the memory area search code of the command packet transmitted by the external device 200 is stored in advance. As will be described later, since the code length determination information is changed by the external device 200, the code length determination information stored in the nonvolatile memory is an initial setting when the power is turned on. For example, the initial setting of the code length determination information may be 2 bytes before the memory area identification code extension, and the initial setting of the code length determination information may be 4 bytes after the memory area identification code extension.

  When the 2-byte code is specified in the area where the code length determination information of the nonvolatile memory is held, the fact that the 2-byte code is specified as the code length determination information is written in the volatile memory (RAM 160). (S206). In addition, when a 4-byte code is specified in the area where the code length determination information of the nonvolatile memory is held, it is confirmed that the 4-byte code is specified as the code length determination information in the volatile memory (RAM 160). Write (S210).

  In step S206, if the code length determination information is written to the volatile memory as 2 bytes, the code length of the memory area search code included in the command packet transmitted by the external device 200 is set to 2 bytes. (S208). That is, “0” is added to the upper 2 bytes of the 2-byte memory area search code, and the memory area identification code is searched. In step S210, if the code length determination information is written to be 4 bytes in the volatile memory, the code length of the memory area search code included in the command packet transmitted by the external device 200 is 4 bytes. (S212). That is, a memory area identification code is searched using a 4-byte memory area search code.

  As described above, after the code length determination information is written in the volatile memory in step S206 or step S210, the code length determination information is stored in the nonvolatile memory set at the time of power-on unless the external device 200 changes the code length determination information. The command packet is divided using the held code length determination information.

  Next, a code length determination information setting method when the code length determination information is transmitted by the external device 200 will be described with reference to FIG. First, the code length determination information transmitted by the external device 200 is received (S302). It is determined whether the code length determination information received in step S302 is a 2-byte code or a 4-byte code (S304).

  If the code length determination information transmitted by the external device 200 is 2 bytes, the fact that the 2-byte code is specified as the code length determination information is written in the volatile memory (S306). If the code length determination information transmitted by the external device 200 is 4 bytes, the fact that the 4-byte code is specified as the code length determination information is written in the volatile memory (S310).

  In step S306, when the code length determination information is written to the volatile memory as 2 bytes, the code length of the memory area search code included in the command packet transmitted by the external device 200 is set to 2 bytes. (S308). That is, “0” is added to the upper 2 bytes of the 2-byte memory area search code, and the memory area identification code is searched. If it is written in step S310 that the code length determination information is 4 bytes in the volatile memory, the code length of the memory area search code included in the command packet transmitted by the external device 200 is 4 bytes. (S312). That is, a memory area identification code is searched using a 4-byte memory area search code.

  As described above, even if memory area search codes having different code lengths are mixed, the memory area included in the command packet is set using the code length determination information set in advance or the code length determination information transmitted by the external device 200. The search code and the write data can be correctly divided.

  Further, the code length determination information stored in the nonvolatile memory may be changed. Before the code length extension of the memory area identification code, the 2-byte code before the code length extension is stored in the nonvolatile memory, and the 2-byte code is set as the initial value. After the code extension of the memory area identification code, the code length is extended. The 4-byte code may be stored in a non-volatile memory, and the 4-byte code may be used as an initial value. Next, a method for changing the code length determination information stored in the nonvolatile memory will be described.

  FIG. 9 is a flowchart showing a method for changing the code length determination information stored in the nonvolatile memory. First, code length determination information stored in the nonvolatile memory is designated (S402). The code length determination information specified in step S402 may be transmitted by the external device 200, or may be specified by a command input when the memory area identification code is expanded.

  In step S404, if the specified code length determination information is 2 bytes, the fact that the 2-byte code is specified is written in the area of the nonvolatile memory where the code length determination information is stored. In step S404, if the specified code length determination information is 4 bytes, the fact that the 4-byte code is specified is written in the area where the code length determination information of the nonvolatile memory is stored. After the code length determination information of the nonvolatile memory is set in step S406 or step S408, as described above, the code length determination information of the nonvolatile memory becomes the initial value when the power is turned on, and the initial value becomes the volatile memory. Stored in

  The method for setting the code length determination information has been described above. Next, a processing flow of the information processing apparatus 100 and the external device 200 in the present embodiment will be described with reference to FIG.

<5. Flow of processing between information processing device and external device>
FIG. 10 is a flowchart showing the flow of data transmission / reception processing between the information processing apparatus 100 and the external device 200. First, when the information processing apparatus 100 is powered on (S502), the code length determination information stored in the nonvolatile memory is read and stored in the volatile memory (S504).

  Then, when the external device 200 transmits the code length determination information (S506) and the information processing apparatus 100 receives the code length determination information, the code length determination information stored in the volatile memory of the information processing apparatus 100 is changed. (S508). Thereafter, the external device 200 transmits a command packet (S510), and the information processing apparatus 100 receives the command packet. The information processing apparatus 100 divides the command packet into a memory area search code and write data based on the code length determination information stored in the volatile memory (S512).

  If the memory area search code length divided in step S512 is different from the memory area identification code length, the memory area search code length is converted to become the memory area identification code length (S514). A memory area identification code corresponding to the memory area search code converted in step S514 is searched (S516). In step S516, the write data divided in step S512 is written into the memory area to which the searched memory area identification code is assigned (S518). In step S518, the external device 200 is notified that the data writing has been completed (S520).

  The processing flow of the information processing apparatus 100 and the external device 200 has been described above. Next, an internal process in the information processing apparatus 100 when the memory area identification code is 4 bytes and the memory area search code is 2 bytes or 4 bytes will be described in detail.

  As shown in FIG. 5, when the memory area is divided and the code length of the memory area identification code for identifying the divided memory area is unified to 4 bytes, the code of the memory area search code for searching the memory area If the length is not 4 bytes which is the same as the code length of the memory area identification code, the memory area cannot be searched correctly. When the memory area search code is a 2-byte code shorter than the 4-byte code, the information processing apparatus 100 adds “0” to the upper 2 bytes of the memory area search code to form a 4-byte code.

  As shown in FIG. 11, when the information processing apparatus 100 receives a command in which the memory area search code is specified by a 2-byte code (S602), the memory area search code is converted into a 4-byte code (S606). Then, the process of step S608 is performed using the converted memory area search code. On the other hand, when a command in which the memory area search code is specified by a 4-byte code is received, the process of step S608 is performed without conversion.

  In step S608, first, it is determined whether or not there is a possibility that a memory area search code having a code length of 4 bytes exists in the memory area (pre-condition is determined). For example, when the same memory identification code as the memory search code does not exist in the file system, error processing is performed. If there is a possibility that the memory area search code exists in the memory area, the memory area identification code corresponding to the memory area search code is searched, and the memory area to which the memory area identification code is assigned is searched for the write data. Write (search memory space and execute processing). Thereafter, it is confirmed whether or not the write data has been written correctly (post-conditions are determined).

  In step S608, after a search process or the like is performed, a response packet is returned to the external device 200 (S610).

  In this way, even if 2-byte or 4-byte memory area search codes are mixed, the memory area search process need only include a process that handles the memory area search code as 4 bytes. Compared with the case where two processes of 2 bytes and 4 bytes are provided, the process and the program can be simplified.

  The internal processing in the information processing apparatus 100 has been described above. According to the above configuration, when there are file systems with code systems before and after code expansion, the memory area identification code is unified with the code length after code expansion in the memory space of the information processing device. When the memory area identification code before management and code extension is received, it is possible to search the memory area correctly by extending the code length after code extension. This makes it possible to ensure compatibility of memory area identification codes having different code lengths without converting the memory area identification code before code expansion by an external device. Further, in the information processing apparatus 100, it is only necessary to perform internal processing using the code length after code expansion, so that the processing / program can be simplified.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  In the information processing system 10 described above, a command packet is transmitted from the external device 200 to the information processing apparatus 100, but the present invention is not limited to this example. For example, when the information processing apparatus 100 is built in a portable information terminal or the like, a command packet may be transmitted from the transmitting unit provided in the portable information terminal to the built-in information processing apparatus 100. For example, if the information processing apparatus 100 is a semiconductor integrated circuit such as an IC chip, the IC chip is built in the portable information terminal, and command packets can be transmitted and received between the IC chip and the portable information terminal through a wired interface. It becomes possible. For example, even when a 2-byte code file system and a 4-byte code file system are mixed in a portable information terminal, the identification code of the memory area in the IC chip is unified into a 4-byte code, and the 2-byte code and 4-byte code are unified. Compatibility can be ensured in correspondence with both code systems of the code.

  The present invention is applicable to an information processing system that transmits / receives data of a file system having memory area identification codes having different code lengths.

1 is a block diagram showing an overall configuration of an information processing system according to an embodiment of the present invention. It is a block diagram which shows the function structure of the information processing apparatus in the embodiment. 3 is an explanatory diagram showing a hierarchical structure of a memory area in the same embodiment. FIG. It is explanatory drawing which shows the command packet in the same embodiment. 3 is an explanatory diagram showing a hierarchical structure of a memory area in the same embodiment. FIG. It is a flowchart which shows the flow of a process of the information processing apparatus in the embodiment. It is a flowchart which shows the setting method of the code length determination information in the embodiment. It is a flowchart which shows the setting method of the code length determination information in the embodiment. It is a flowchart which shows the setting method of the code length determination information in the embodiment. 3 is a timing chart showing a flow of processing of the information processing apparatus and the external device in the embodiment. It is explanatory drawing which shows the internal process of the information processing apparatus in the embodiment. It is explanatory drawing which shows the hierarchical structure of the conventional memory area.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Information processing apparatus 122 Code length determination information reception part 132 Command packet division part 133 Code length comparison judgment part 134 Code length conversion part 135 Memory area identification code search part 151 Memory area 200 External device 501,502 Command packet

Claims (12)

An information processing system in which an external device that transmits a command packet and an information processing apparatus that receives the command packet can communicate in a contactless manner;
The information processing apparatus includes:
A memory area divided into a plurality of areas and provided with a memory area identification code for identifying each of the divided areas;
Based on the code length determination information set in advance to determine the code length of the memory area search code for searching the divided memory area, the received command packet is converted into a memory area search code and a memory area identification code. A command packet division unit for dividing the write data into the corresponding memory area;
A code length comparison and determination unit for comparing and determining the code length of the memory area search code divided by the command packet dividing unit and the code length of the memory area identification code;
A code length conversion unit that converts the memory area search code length according to the determination result of the code length comparison determination unit;
An information processing system comprising: The information processing apparatus is composed of a non-contact type IC card containing an IC chip,
2. The information processing system according to claim 1, wherein the external device is a reader / writer device capable of non-contact communication with the non-contact type IC card. An information processing apparatus capable of contactless communication with an external device that transmits a command packet;
A memory area divided into a plurality of areas and provided with a memory area identification code for identifying each of the divided areas;
Based on the code length determination information set in advance to determine the code length of the memory area search code for searching the divided memory area, the received command packet is converted into a memory area search code and a memory area identification code. A command packet division unit for dividing the write data into the corresponding memory area;
A code length comparison and determination unit for comparing and determining the code length of the memory area search code divided by the command packet dividing unit and the code length of the memory area identification code;
A code length conversion unit that converts the memory area search code length according to the determination result of the code length comparison determination unit;
An information processing apparatus comprising: The code length conversion unit
4. The memory area search code length is converted only when the code length comparison / determination unit determines that the memory area search code length does not correspond to the memory area identification code length. The information processing apparatus described in 1. The code length conversion unit
When the code length comparison / determination unit determines that the memory area search code length is shorter than the memory area identification code length, the memory area search code length is extended to the memory area identification code length. The information processing apparatus according to claim 4. A memory area identification code search unit for searching for the memory area identification code corresponding to the memory area search code;
A data writing unit for writing the write data divided by the command packet dividing unit into the memory region to which the memory region identification code searched by the memory region identification code searching unit is assigned;
The information processing apparatus according to claim 3, further comprising: A code length determination information receiving unit for receiving the code length determination information transmitted by the external device;
The command packet dividing unit divides the command packet into the memory area search code and the write data in place of the transmitted code length determination information instead of preset code length determination information. The information processing apparatus according to claim 3. The memory area is divided into a first area and a second area;
The data writing unit
Writing the write data in which the code length of the memory area search code included in the transmitted command packet is shorter than the memory area identification code length in the first area,
The write data in which the code length of the memory area search code included in the transmitted command packet is the same code length as the memory area identification code length is written in the second area, The information processing apparatus according to claim 6 .   4. The information processing apparatus according to claim 3, wherein a code length of a memory area identification code for accessing the divided memory area is a constant code length. The code length of the memory area identification code for accessing the divided memory area is standardized to the longest code length of the memory area search code included in the command packet transmitted by the external device. The information processing apparatus according to claim 3. An information processing method by an information processing apparatus comprising a code length determination information reading unit, a command packet dividing unit, a code length comparison / determination unit, and a code length conversion unit,
Reading out code length determination information set in advance to determine a code length of a memory area search code for searching a memory area to which a memory area identification code is assigned by the code length conversion unit ;
Dividing the command packet received from the external device into the memory area search code and the write data to be written in the memory area corresponding to the memory area identification code based on the code length determination information by the command packet dividing unit ;
Comparing and determining the code length of the memory area search code and the code length of the memory area identification code by the code length comparison and determination unit;
Converting the memory area search code length by the code length conversion unit when the memory area search code length does not correspond to the memory area identification code length;
An information processing method characterized by including: Computer
A process of reading out code length determination information set in advance to determine the code length of a memory area search code for searching a memory area to which a memory area identification code is assigned;
A process of dividing a command packet received from an external device into a memory area search code and write data to be written in a memory area corresponding to the memory area identification code based on the code length determination information;
Processing for comparing and determining the code length of the memory area search code and the code length of the memory area identification code;
A process of converting the memory area search code length when the memory area search code length does not correspond to the memory area identification code length;
A computer program characterized in that it is executed.

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