JP6962159B2 - Server, data generation method for reproduction and data generation program for reproduction - Google Patents

Description

The present invention relates to a server, a reproduction data generation method and a reproduction data generation program, and more particularly to a server simulating an information processing apparatus, a reproduction data generation method and a reproduction data generation program executed on the server.

In recent years, an image forming apparatus represented by a multifunction device (hereinafter referred to as "MFP") may generate an error when receiving data in a packet format from the outside and processing the received data. In order to investigate the cause of the error that occurs in the MFP, it is necessary to reproduce the error, but in this case, the data received by the MFP is required.

For example, Japanese Patent Application Laid-Open No. 2016-152464 temporarily describes a packet receiving unit that receives a packet from a network, a packet duplicating unit that replicates a packet received from the packet receiving unit, and an original packet received from the packet duplicating unit. The first packet buffer section that stores in the packet, the second packet buffer section that temporarily stores the duplicated packets received from the packet duplication section, and the original packet and the duplicated packet that operate in the virtual environment. A technique is disclosed in which normal network processing is performed on one side, constant monitoring is performed on the other side, and analysis is performed using packets that are constantly monitored when a failure event occurs.

However, in the technique described in Japanese Patent Application Laid-Open No. 2016-152464, when the analysis using the packet that is constantly monitored is outsourced to an external contractor, if the packet contains highly confidential information, the confidentiality is disclosed. There is a problem that highly relevant information is leaked to an outside contractor.
Japanese Unexamined Patent Publication No. 2016-152464

The present invention has been made to solve the above-mentioned problems, and one of the purposes of the present invention is to reproduce an error that occurs when sending and receiving data between two devices, and to reduce the size of the data. Can provide a server capable of generating.

Another object of the present invention is to provide a reproduction data generation method capable of reproducing an error generated when transmitting and receiving data between two devices and generating data having a reduced size. ..

Still another object of the present invention is to provide a reproduction data generation program capable of reproducing an error generated when transmitting and receiving data between two devices and generating data having a reduced size. be.

The present invention has been made to solve the above-mentioned problems, and according to an aspect of the present invention, the server is a simulating means for simulating an image forming device, and the image forming device receives a received packet from the outside. When an error occurs in the image forming apparatus after reception, the body of a plurality of received packets is synthesized based on the acquisition means for acquiring the received packet and the error information indicating the error and the information in the header part of the plurality of received packets. To generate processing data and generate a change packet based on at least one of a plurality of divided parts obtained by dividing the processing data, and a virtual device in which the simulating means simulates an image forming device. A virtual execution control means for receiving a packet and a packet determination means for determining a change packet as a reproduction packet when an error indicated by error information occurs when the virtual device receives a change packet generated by the generation means. Be prepared.

According to this aspect, when an error occurs in the image forming apparatus after the image forming apparatus receives the received packet from the outside, the received packet and the error information indicating the error are acquired, and the modification including at least a part of the received packet is obtained. When a packet is generated and the virtual device simulating the image forming device receives the change packet, and the error indicated by the error information occurs when the virtual device receives the packet, the change packet is determined as the reproduction packet. Therefore, it is possible to generate a change packet that includes at least a part of the received packet received by the image forming apparatus and causes the same error as when the image forming apparatus receives the received packet. Therefore, it is possible to reproduce the error generated in the MFP that receives the packet from the outside, and to generate the reproduction data having a smaller size. As a result, it is possible to provide a server that can reproduce an error that occurs when data is transmitted and received between two devices and can generate data with a reduced size.

Preferably, an output means for outputting the reproduction packet to the outside is further provided.

According to this aspect, since the reproduction packet is output to the outside, the error generated in the information processing apparatus that receives the transmission packet transmitted by the image forming apparatus can be reproduced externally.

Preferably, the acquisition means acquires as a received packet one or more packets determined by the unit of data to be processed by the image forming apparatus or the unit of processing in which the image forming apparatus processes the data.

According to this aspect, since the received packet is one or more packets determined by the unit of data or the unit of processing, it is not necessary to store all the packets received by the image forming apparatus, and the memory resource is effectively used. be able to. In addition, it becomes easy to reproduce an error that occurs in a process executed for one data or an error that occurs in one process.

Preferably, the generating means generates the modified packet by rewriting the predetermined confidential information of the received packet into dummy information.

According to this aspect, since the change packet is generated by rewriting a part of the received packet with another data, it is possible to prevent the change packet from containing highly confidential information.

Preferably, the portion of the received packet is a portion containing a predetermined type of data and / or a predetermined portion.

According to this aspect, since a part of the received packet contains a predetermined type of data and / or a predetermined part, the type of confidential information contained in the received packet or the position in the received packet. The modified packet can be prevented from containing sensitive information if is known in advance.

Preferably, the generating means generates the modified packet by deleting a part of the received packet.

According to this aspect, since the modified packet is a packet in which a part thereof is deleted from the received packet, the data amount of the modified packet can be made smaller than that of the transmitted packet.

Preferably, when there are a plurality of received packets, the generation means generates a plurality of change packets corresponding to the plurality of received packets.

According to this aspect, since a plurality of change packets corresponding to the plurality of change packets are generated, the reproduction packet can be easily determined.

According to another aspect of the present invention, the reproduction data generation method involves a simulation step of simulating an image forming apparatus and an error occurs in the image forming apparatus after the image forming apparatus receives a received packet from the information processing apparatus. In this case, based on the acquisition step of acquiring the received packet and the error information indicating the error and the information in the header part of the plurality of received packets, the bodies of the plurality of received packets are combined to generate the processing data, and the processing is performed. A generation step that generates a change packet based on at least one of a plurality of divided parts that divide data, a virtual execution control step that causes a virtual device that simulates an image forming device to receive a change packet, and a virtual device that generates the change packet. When the virtual device receives the change packet generated in the step and the error indicated by the error information occurs, the server is made to execute the packet determination step of determining the change packet as the reproduction packet.

According to this aspect, it is possible to provide a reproduction data generation method capable of reproducing an error generated when data is transmitted and received between two devices and generating data having a reduced size.

According to yet another aspect of the present invention, the reproduction data generation program has a simulation step of simulating the image forming apparatus and an error in the image forming apparatus after the image forming apparatus receives a received packet from the information processing apparatus. When it occurs, the processing data is generated by synthesizing the bodies of multiple received packets based on the acquisition step of acquiring the received packet and error information indicating the error and the information in the header part of the plurality of received packets. A generation step that generates a change packet based on at least one of a plurality of divided portions that divide the processing data, a virtual execution control step that causes a virtual device that simulates an image forming device to receive a change packet, and a virtual device. When the virtual device receives the change packet generated in the generation step and the error indicated by the error information occurs, the computer is made to execute the packet determination step of determining the change packet as the reproduction packet.

According to this aspect, it is possible to provide a reproduction data generation program capable of reproducing an error generated when data is transmitted and received between two devices and generating data having a reduced size.

It is a figure which shows an example of the whole outline of the information processing system in one of the Embodiments of this invention. It is a block diagram which shows an example of the outline of the hardware configuration of the internal server in this embodiment. It is a block diagram which shows an example of the outline of the hardware configuration of the MFP in this embodiment. It is a block diagram which shows an example of the detailed structure of the main board in this embodiment. It is a figure which shows an example of the outline of the simulator provided in the internal server in this embodiment. It is a block diagram which shows an example of the function which the CPU included in the MFP in this Embodiment has. It is a block diagram which shows an example of the function which the CPU included in the internal server in this embodiment has. It is a flowchart which shows an example of the flow of the data generation process for reproduction. It is a flowchart which shows an example of the flow of the change packet generation processing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are designated by the same reference numerals. Their names and functions are the same. Therefore, detailed explanations about them will not be repeated.

FIG. 1 is a diagram showing an example of an overall outline of an information processing system according to one of the embodiments of the present invention. With reference to FIG. 1, the information processing system 1 includes an MFP (MultiFaction Peripheral) 100, a personal computer (hereinafter referred to as “PC”) 300, an internal server 200, and a verification server 500.

The MFP 100 is an example of an image forming apparatus, and has at least an image processing function for image processing data to be processed and an image forming function for forming an image on a recording medium such as paper based on the image data. In addition to the image processing function and the image forming function, the MFP 100 may include a document reading function for reading a document and a facsimile transmission / reception function for transmitting / receiving facsimile data. The image processing is not limited, but is a process of converting image data into raster data capable of forming an image, a sharpening process of emphasizing edges in an image, a smoothing process of smoothing color changes in an image, and data. Includes a coding process that converts the image into smaller size coded data, a decoding process that decodes the coded data, and a conversion process that converts the format of the image data.

The PC 400 and the verification server 500 are general computers. Therefore, their hardware configurations and functions are well known and will not be repeated here.

The MFP 100, the internal server 200, and the PC 400 are each connected to the local area network (LAN) 3. Therefore, each of the MFP 100, the PC 400, and the internal server 200 can send and receive data via the LAN 3. Since the LAN 3 has a closed environment in which the devices connected to the LAN 3 are limited, data transmitted / received between a plurality of devices connected to the LAN 3, here the MFP 100, the PC 400, and the internal server 200 leaks to the outside. Security is ensured so that there is no such thing. The connection form of LAN3 may be wired or wireless. Further, instead of LAN3, if security is ensured, a network using a public switched telephone network (Public Switched Telephone Networks) or a wide area network (WAN) may be used.

LAN 3 is connected to the Internet 5. The verification server 500 is connected to the Internet 5. Therefore, each of the MFP 100, the PC 400, and the internal server 200 can communicate with the verification server 500 connected to the Internet 5 via the LAN 3. The MFP 100, PC 400 and the internal server 200 are devices arranged internally, whereas the verification server 500 is a device arranged externally to the MFP 100, PC 400 and the internal server 200. The inside means an area where security is ensured, and the outside means an area where security is not secured inside.

In the information processing system 1 of the present embodiment, when a problem occurs in the MFP 100 that transmits data from the PC 400 to the MFP 100 and processes the received data, the verification server 500 verifies the problem that has occurred in the MFP 100. The verification here is to set the MFP 100 or the PC 400 so that the problem that occurs in the MFP 100 does not occur next. For example, the application program installed in either the MFP 100 or the PC 400 is updated so that the data transmitted from the PC 400 to the MFP 100 becomes the data that can be processed by the MFP 100. In the verification server 500, in order to reproduce the defect that occurred in the MFP 100, the data that causes the defect, here, the data transmitted from the PC 400 to the MFP 100 is required, and the data is highly confidential information. May include. Therefore, instead of transmitting the data itself transmitted from the PC 400 to the MFP 100 to the verification server 500, the internal server 200 reproduces the same defect as the defect that occurred in the MFP 100 by using the data transmitted from the PC 400 to the MFP 100 in the internal server 200. It is converted into reproduction data, and the reproduction data is transmitted to the verification server 500. The reproduction data is transmitted to the verification server 500 located outside the closed environment including the MFP 100, the PC 400 and the internal server 200 connected to the LAN 3, but the confidential information contained in the data cannot be reproduced from the reproduction data. For this reason, it is possible to prevent confidential information from being leaked to the outside.

FIG. 2 is a block diagram showing an example of an outline of the hardware configuration of the internal server according to the present embodiment. With reference to FIG. 2, the internal server 200 includes a central arithmetic unit (CPU) 201 for controlling the entire internal server 200, a ROM (Read Only Memory) 202 for storing a program to be executed by the CPU 201, and the like. A RAM (Random Access Memory) 203 used as a work area of the CPU 201, a hard disk drive (HDD) 204 for storing data non-volatilely, a communication unit 205 for connecting the CPU 201 to LAN3, and a display unit 206 for displaying information. And an operation unit 207 that accepts input of a user's operation, and an external storage device 208.

The display unit 206 is a display device such as a liquid crystal display (LCD) or an organic ELD (Electro-Luminescence Display). The operation unit 207 is a hard key such as a keyboard. Further, the operation unit 207 may be a touch panel. The touch panel is provided on the upper surface or the lower surface of the display unit 206 so as to be superimposed on the display unit 206. The touch panel detects a position designated by the user on the display surface of the display unit 206.

The communication unit 205 is an interface for connecting the CPU 201 to the LAN 3. The communication unit 205 communicates with the MFP 100 or the PC 400 connected to the LAN 3 by a communication protocol such as TCP (Transmission Control Protocol) or UDP (User Datagram Protocol). The protocol for communication is not particularly limited, and any protocol can be used. By registering the IP (Internet Protocol) addresses of the MFP 100 and the PC 400 in the internal server 200, the internal server 200 can communicate with the MFP 100 and the PC 400, respectively, and can transmit and receive data.

The HDD 204 stores a program executed by the CPU 201 or data necessary for executing the program. The CPU 201 loads the program recorded in the HDD 204 into the RAM 203 and executes the program.

The external storage device 208 is equipped with a CD-ROM (Compact Disk ROM) 209 that stores the program. The CPU 201 can access the CD-ROM 209 via the external storage device 208. The CPU 201 loads the program recorded in the CD-ROM 209 mounted on the external storage device 208 into the RAM 203 and executes the program. The medium for storing the program executed by the CPU 201 is not limited to the CD-ROM209, but is an optical disk (MO (Magnetic Optical Disc) / MD (Mini Disc) / DVD (Digital Versaille Disc)), an IC card, an optical card, and the like. It may be a semiconductor memory such as a mask ROM or an EPROM (Erasable Program ROM).

Further, the program executed by the CPU 201 is not limited to the program recorded in the CD-ROM 209, and the program stored in the HDD 204 may be loaded into the RAM 203 and executed. In this case, another computer connected to the LAN 3 may rewrite the program stored in the HDD 204, or add a new program and write the program. Further, the internal server 200 may download the program from another computer connected to the LAN 3 or the Internet 5 and store the program in the HDD 204. The program referred to here includes not only a program that can be directly executed by the CPU 201, but also a source program, a compressed program, an encrypted program, and the like.

FIG. 3 is a block diagram showing an example of an outline of the hardware configuration of the MFP in the present embodiment. With reference to FIG. 3, the MFP 100 includes a main board 111, a document reading unit 130 for reading a document, an automatic document transporting device 120 for transporting a document to the document reading unit 130, and a document reading unit 130. An image forming unit 140 for forming an image on paper or the like based on image data to be read and output, a paper feeding unit 150 for supplying paper to the image forming unit 140, and a communication interface (I / F) unit. It includes 160, a facsimile unit 170, an external storage device 180, a hard disk drive (HDD) 113 as a large-capacity storage device, and an operation panel 115 as a user interface.

The main board 111 is connected to an automatic document transfer device 120, a document reading unit 130, an image forming unit 140 and a paper feeding unit 150, a communication I / F unit 160, a facsimile unit 170, an external storage device 180, an HDD 113, and an operation panel 115. And controls the whole MFP100.

The automatic document transfer device 120 automatically transports a plurality of sheets set on the document tray one by one to a predetermined document reading position set on the platen glass of the document reading unit 130, and the document reading unit 130. The original from which the image formed on the original is read is ejected to the original output tray. The document scanning unit 130 includes a light source that irradiates the document conveyed to the document scanning position with light and a photoelectric conversion element that receives the light reflected by the document, and scans the document image according to the size of the document. The photoelectric conversion element converts the received light into image data which is an electric signal and outputs the light to the image forming unit 140.

The paper feed unit 150 conveys the paper stored in the paper feed tray to the image forming unit 140. The image forming unit 140 forms an image by a well-known electrophotographic method, and the image data input from the document reading unit 130 is subjected to various data processing such as shading correction, and the image data after the data processing is performed. Alternatively, an image is formed on the paper conveyed by the paper feed unit 150 based on the image data received from the outside, and the paper on which the image is formed is discharged to the output tray.

The communication I / F unit 160 is an interface for connecting the MFP 100 to the LAN 3. The communication I / F unit 160 communicates with another computer connected to the network by a communication protocol such as TCP or UDP. The protocol for communication is not particularly limited, and any protocol can be used.

The communication I / F unit 160 outputs the data received from the LAN 3 to the main board 111, and outputs the data input from the main board 111 to the LAN 3. The communication I / F unit 160 outputs only the data destined for the MFP 100 among the data received from the LAN 3 to the main board 111, and discards the data received from the LAN 3 destined for the device different from the MFP 100.

The facsimile unit 170 is connected to the public switched telephone network (PSTN) to transmit and receive facsimile data. The external storage device 180 is equipped with a CD-ROM181 or a semiconductor memory. The external storage device 180 reads the data stored in the CD-ROM181 or the semiconductor memory. The external storage device 180 stores data in the CD-ROM181 or the semiconductor memory.

The operation panel 115 is provided on the upper surface of the MFP 100 and includes a display unit 118 and an operation unit 119. The display unit 118 is a display device such as a liquid crystal display (LCD) or an organic ELD, and displays an instruction menu for the user, information on acquired image data, and the like. The operation unit 119 includes a plurality of hard keys and a touch panel. The touch panel is a multi-touch compatible touch panel provided on the upper surface or the lower surface of the display unit 118 so as to be superimposed on the display unit, and detects a position designated by the user on the display surface of the display unit 118.

FIG. 4 is a block diagram showing an example of a detailed configuration of the main board according to the present embodiment. With reference to FIG. 4, the main board 111 includes a CPU 171, a ROM 173, a RAM 175, and an image control ASIC (Application Specific Integrated Circuit) 177.

The CPU 171 and the ROM 173, the RAM 175, and the image control ASIC 177 are each connected to the bus 179, and data can be transferred. The CPU 171 controls the entire MFP 100. The ROM 173 stores a program executed by the CPU 171. The RAM 175 is a volatile semiconductor memory used as a work area of the CPU 171.

The CPU 171 loads the program stored in the HDD 113 into the RAM 175 and executes the program. The program executed by the CPU 171 includes a control program for controlling hardware resources and an application program. Hardware resources include an automatic document transfer device 120, a document reading unit 130, an image forming unit 140, a paper feeding unit 150, a communication I / F unit 160, a facsimile unit 170, an HDD 113, and an operation panel 115. The application program is, for example, a facsimile transmission program that controls the facsimile unit 170 to transmit facsimile data, a facsimile reception program that controls the facsimile unit 170 to receive facsimile data, and a print job that controls the communication I / F unit 160. Is included, a print program that controls the image forming unit 140 and the paper feeding unit 150 to form an image based on a print job, and a document reading program that controls the document reading unit 130 to read a document. Further, the application program may include a maintenance program for managing consumables included in the MFP 100 and an error status notification program for notifying an error status. The application program executed by the CPU 171 is not limited to these.

The image control ASIC 177 is connected to and controls an automatic document transfer device 120, a document reading unit 130, an image forming unit 140, and a paper feeding unit 150. Further, the image control ASIC 177 has a function of executing a predetermined image process on the image data read by the document reading unit 130 and outputting the document, and a function of converting the image data into raster data for printing by the image forming unit 140. ..

FIG. 5 is a diagram showing an example of an outline of the simulator provided in the internal server according to the present embodiment. This simulator is formed in the CPU 201 by the CPU 201 executing a simulation program. With reference to FIG. 5, the simulator includes a CPU peripheral simulator 300 and a hardware (HW) simulator 320. The CPU peripheral simulator 300 includes a virtual CPU 301 that simulates the CPU 171 included in the MFP 100, a virtual memory 303 that emulates the ROM 173 and the RAM 175, a peripheral model 305, a synchronization setting model 307, and an interrupt control unit 309. .. The virtual CPU 301, the virtual memory 303, the peripheral model 305, and the synchronization setting model 307 are connected to the bus 311.

The peripheral model 305 includes an HDD 113, an operation panel 115, an HDD 113A that emulates a communication I / F unit 160 and an external storage device 180, respectively, an operation panel 115A, a communication I / F unit 160A, and an external storage device 180A included in the MFP 100.

The synchronization setting model 307 is set so that the virtual CPU 301 synchronizes with the virtual memory 303 and the peripheral model 305. The interrupt control unit 309 generates an interrupt in the virtual CPU 301 when the virtual CPU 301 is set to synchronize with the virtual memory 303 and the peripheral model 305.

The HW simulator 320 includes a PCI-ExpressBus model 321, an image control ASIC model 323, and a hardware resource model 325. The PCI-ExpressBus model 321 is connected to bus 311 and emulates a connection according to the PCI-Express standard. The image control ASIC model 323 emulates the image control ASIC 177 included in the MFP 100. The hardware resource model 325 emulates the hardware resources included in the MFP 100. Specifically, the hardware resource model 325 includes an automatic document transfer device 120A that emulates an automatic document transfer device 120, a document reading unit 130, an image forming unit 140, a paper feeding unit 150, and a facsimile unit 170 included in the MFP 100. It includes a document reading unit 130A, an image forming unit 140A, a paper feeding unit 150A, and a facsimile unit 170A.

FIG. 6 is a block diagram showing an example of the functions of the CPU included in the MFP in the present embodiment. The function shown in FIG. 6 is a function realized by the CPU 171 when the CPU 171 included in the MFP 100 executes a verification request program stored in the ROM 173, the HDD 113, or the CD-ROM 181. The verification request program is a part of the reproduction data generation program. With reference to FIG. 6, the CPU 171 has a problem with the communication control unit 51 that controls the communication I / F unit 160, the image processing unit 53 that executes image processing on the data, and the image processing unit 53. It includes a defect detection unit 55 to detect, a packet storage unit 57, and a verification request unit 59.

The communication control unit 51 controls the communication I / F unit 160 to receive a plurality of received packets from the outside. Here, a case where a received packet transmitted by the PC 400 is received will be described as an example. Specifically, the communication control unit 51 controls the communication I / F unit 160 to receive a plurality of received packets transmitted by the PC 400, and receives the received plurality of received packets in the image processing unit 53 and the packet storage unit 57. Output to. In the received packet, the information defined by the communication protocol agreed with the PC 400 is set in the header portion. The header portion of the received packet includes, for example, information that enables the MFP 100 that receives the plurality of received packets to reproduce one processed data from the plurality of divided portions stored in the body portion of the received packet.

For a plurality of received packets, a plurality of received packets may be transmitted for one transmission command, and each of the plurality of received packets included in the same set is included in the same set for one transmission command. Command identification information indicating that is included. The communication control unit 51 outputs the command identification information to the packet storage unit 57 together with each of the plurality of received packets. Further, one processing data may be composed of a plurality of unit portions, and each received packet includes partial identification information for identifying a unit portion including a divided portion set in the body portion. .. The communication control unit 51 outputs the partial identification information to the packet storage unit 57 together with each of the plurality of received packets. For example, when the processing data is image data composed of a plurality of pages, the unit portion indicates the image data of one page, and the partial identification information indicates the page number.

The packet storage unit 57 stores the received packet in the HDD 113 in association with the command identification information in response to the command identification information and the received packet being input from the communication control unit 51. In this case, the packet storage unit 57 receives command identification information different from the command identification information input from the communication control unit 51 at the time of storing the command identification information and the received packet input from the communication control unit 51 in the HDD 113. When the received packets associated with the command identification information are stored in the HDD 113, it is preferable to erase them from the HDD 113. As a result, it is possible to avoid wasting the storage capacity of the HDD 113.

Further, when the command identification information, the partial identification information, and the received packet are input from the communication control unit 51, the packet storage unit 57 stores the received packet in the HDD 113 in association with the command identification information and the partial identification information. In this case, the packet storage unit 57 stores the command identification information, the partial identification information, and the received packet input from the communication control unit 51 in the HDD 113, and then the command identification information and the partial identification input from the communication control unit 51. When the command identification information, the partial identification information, and the received packet, which are different from the set of the information, are stored in the HDD 113, it is preferable to erase them from the HDD 113. As a result, the storage capacity of the HDD 113 can be effectively used.

The image processing unit 53 performs image processing on the data and generates image data. The image processing unit 53 reproduces the processed data from the plurality of received packets in response to the input of the plurality of received packets from the communication control unit 51, and performs image processing on the processed data. For example, when the processing data is print data, the print data is image-processed according to the conditions determined by the print job. When the processed data is Web data or data stored in the HDD 113, the image processing unit 53 performs image processing on the processed data according to the print conditions input to the operation unit 119 by the user.

The defect detection unit 55 detects a defect that occurs while the image processing unit 53 is executing image processing. The image processing unit 53 is an image processing task in which the CPU 171 executes an image processing program. The defect detection unit 55 detects a defect when the image processing task detects an error predetermined by the image processing program. The error predetermined by the image processing program includes a timeout error in which a predetermined time elapses after the image processing unit 53 starts image processing. The predetermined time may be, for example, a time proportional to the amount of data to be image-processed. When the defect detection unit 55 detects a defect, the defect detection unit 55 outputs the defect information for identifying the detected defect to the verification request unit 59. The defect information includes error identification information for identifying a predetermined error by the image processing program.

The verification request unit 59 reads all the received packets stored in the HDD 113 by the packet storage unit 57 in response to the defect information input from the defect detection unit 55, and requests the internal server 200 to perform verification. Specifically, the verification request unit 59 controls the communication I / F unit 160 to transmit a plurality of received packets read from the HDD 113 and error identification information included in the defect information to the internal server 200. do. When the received packet is associated with the partial identification information, the pair of the received packet and the partial identification information is transmitted to the internal server 200.

FIG. 7 is a block diagram showing an example of the functions of the CPU included in the internal server according to the present embodiment. The function shown in FIG. 7 is a function realized by the CPU 201 when the CPU 201 included in the internal server 200 executes a reproduction data generation program stored in the ROM 202, the HDD 204, or the CD-ROM 209.

With reference to FIG. 7, the CPU 201 included in the internal server 200 includes a device information acquisition unit 251, a packet acquisition unit 253, an error information acquisition unit 255, a simulation unit 257, a virtual execution control unit 259, and a generation unit. 261 includes a reproduction packet determination unit 263 and an output unit 265.

The device information acquisition unit 251 acquires device information transmitted by the MFP 100. Specifically, when the communication unit 205 receives the device identification information from the MFP 100, the device information acquisition unit 251 acquires the received device information. When the device information acquisition unit 251 acquires the device information, the device information acquisition unit 251 outputs the device information to the simulation unit 257. The device information includes information about the CPU 171 installed in the MFP 100, hardware information about the hardware resources installed in the MFP 100, and software information about the software resources installed in the MFP 100. The information about the CPU 171 includes the model name of the CPU 171. The hardware information includes the hardware identification information for identifying the hardware resource and the hardware parameters set for controlling the hardware resource. When there are a plurality of hardware resources, the hardware information includes hardware identification information and hardware parameters for each of the plurality of hardware resources. The software information includes the program name of the program installed in the MFP 100 and the software parameters set to execute the program.

The packet acquisition unit 253 acquires a plurality of received packets transmitted from the MFP 100. When the packet acquisition unit 253 receives a plurality of received packets, the packet acquisition unit 253 outputs them to the generation unit 261.

The error information acquisition unit 255 acquires the error identification information transmitted from the MFP 100. When the error information acquisition unit 255 acquires the error identification information, the error information acquisition unit 255 outputs the error identification information to the reproduction packet determination unit 263.

The generation unit 261 generates a plurality of modified packets including at least a part of each of the plurality of received packets based on the plurality of received packets input from the packet acquisition unit 253. Specifically, the generation unit 261 generates processing data by synthesizing the bodies of the plurality of received packets based on the information described in the header units of the plurality of received packets. Then, the generation unit 261 divides the processing data and generates a plurality of divided portions. For example, the size of the divided portion may be determined in advance, and the number of divisions may be determined from the size of the processing data and the size of the divided portion.

The generation unit 261 generates a change packet based on at least one of the plurality of divided portions. Specifically, the generation unit 261 selects one or more divided portions as the processing target from the plurality of divided portions. When one or more divided portions selected as the processing target include confidential information, the generation unit 261 changes the confidential information to dummy information. Confidential information is information predetermined as highly confidential information. Confidential information is, for example, personal information, predetermined words, and the like. Personal information includes, for example, a user account, password, telephone number, name and the like. The generation unit 261 generates a change packet based on one or more divided portions selected for processing. The generation unit 261 selects a plurality of received packets in order as a processing target, and generates a change packet corresponding to the received packet selected as the processing target. When the body part of the received packet selected for processing includes any one or more of the selected divided parts, the generation unit 261 sets the divided part in the body part of the change packet and sets the header of the received packet. The header part modified so that the part is adapted to the body part in which the divided part is set is set in the header part of the change packet. When the body part of the received packet selected as the processing target does not include any of the selected one or more divided parts, the generation unit 261 does not set anything in the body part of the changed packet and sets the received packet. The header part modified so that the header part fits the empty body part is set in the header part of the change packet. In this way, the generation unit 261 generates a plurality of change packets corresponding to the plurality of received packets. The data reproduced by the plurality of change packets is data obtained by synthesizing one or more divided portions selected from the plurality of divided portions. The generation unit 261 outputs a plurality of generated change packets to the virtual execution control unit 259.

The simulation unit 257 simulates the MFP 100 based on the device information input from the device information acquisition unit 251. First, the simulation unit 257 sets the hardware resources mounted on the MFP 100 and sets the hardware parameters based on the device information.

As hardware resources, the MFP 100 includes an image control ASIC 177, an automatic document transfer device 120, a document reading unit 130, an image forming unit 140, a paper feeding unit 150, a communication I / F unit 160, a facsimile unit 170, an external storage device 180, and an HDD 113. And the operation panel 115. Therefore, the hardware information included in the device information includes the image control ASIC 177, the automatic document transfer device 120, the document reading unit 130, the image forming unit 140, the paper feeding unit 150, the communication I / F unit 160, the facsimile unit 170, and the external storage. The device 180, HDD 113, and operation panel 115 are defined as hardware resources. The simulation unit 257 includes an image control ASIC 177 defined by hardware information included in the device information, an automatic document transfer device 120, a document reading unit 130, an image forming unit 140, a paper feeding unit 150, a communication I / F unit 160, and a facsimile. An emulator that emulates each of the unit 170, the external storage device 180, the HDD 113, and the operation panel 115 is set, and the hard parameters included in the hard information are set. Further, the simulation unit 257 sets the synchronization with the hardware resource to be emulated. For example, the synchronization setting model 307 of the CPU peripheral simulator 300 shown in FIG. 5 is made to set the register value of the virtual CPU 301 so that the virtual CPU 301 synchronizes with the emulator of the hardware resource, and rewrites the memory map of the virtual memory 303. ..

Further, the simulation unit 257 sets the software resource defined by the software information included in the device information to the state in which the virtual CPU executes, and sets the set value included in the device information. Specifically, the simulation unit 257 installs the software resource defined by the software information included in the device information, and sets the set value included in the device information. As a result, the virtual device simulating the MFP 100 is completed in the simulation unit 257. The data stored in the RAM 175 of the MFP 100 may be acquired as a snapshot and stored in the virtual memory 303.

The virtual execution control unit 259 controls the simulation unit 257 in response to the input of a plurality of change packets from the generation unit 261, and the simulation unit 257 is used as a virtual device for simulating the MFP 100. Receive the change packet input from.

The reproduction packet determination unit 263 is input from the generation unit 261 when the error generated in the virtual device simulated by the simulation unit 257 is the same as the error specified by the error identification information input from the error information acquisition unit 255. A plurality of changed packets to be changed are determined as reproduction packets, and an output instruction is output to the output unit 265. The output instruction includes a reproduction packet.

In the reproduction packet determination unit 263, when the error generated in the virtual device simulated by the simulation unit 257 is different from the error specified by the error identification information input from the error information acquisition unit 255, or the simulation unit If no error occurs in the virtual device simulated by 257, the regeneration instruction is output to the generation unit 261 without outputting the output instruction to the output unit 265.

When a regeneration instruction is input from the reproduction packet determination unit 263, the generation unit 261 selects one or more divided portions different from the one or more divided portions selected so far as the processing target, and newly selects one or more divided portions as the processing target. Generates a change packet based on one or more splits selected for processing.

Specifically, the generation unit 261 determines the selection number M (M is a positive integer), and sets the division subset consisting of M division portions among the plurality of division portions into M from the plurality of division portions. Generate as many combinations as you want to select. The selection number M is the number of divided portions used to generate the change packet. The generation unit 261 determines M division portions to be processed by selecting one division portion to be processed from the generated plurality of division portions. The generation unit 261 generates a plurality of change packets based on the M divided portions determined to be processed. Further, when the reproduction instruction is input from the reproduction packet determination unit 263, the generation unit 261 selects one unselected division portion from the plurality of division portions. When all of the plurality of divided subsets are selected, the generation unit 261 changes the number of selections M and generates a plurality of new divided subsets. For example, it is preferable that the initial value of the number of selections M is 1, and the number of selections is increased in order from 1.

The output unit 265 transmits the reproduction packet included in the output instruction to the verification server 500 in response to the output instruction input from the reproduction packet determination unit 263, and requests verification. The reproduction packet may be transmitted to the MFP 100, and the MFP 100 may request the verification server 500 for verification, or the reproduction packet may be transmitted to the PC 400, and the PC 400 may request the verification server 500 for verification. May be good.

FIG. 8 is a flowchart showing an example of the flow of the reproduction data generation process. The reproduction data generation process is a function realized by the CPU 201 when the CPU 201 included in the internal server 200 executes a reproduction data generation program stored in the ROM 202, HDD 204, or CD-ROM 209.

With reference to FIG. 8, the CPU 201 determines whether or not the verification request has been received (step S01). The communication unit 205 determines whether or not the verification request has been received from the MFP 100. The standby state is set until the verification request is received, and when the verification request is received, the process proceeds to step S02. Since the MFP 100 transmits the device information, the plurality of received packets, and the error identification information together with the verification request, in step S02, the communication unit 205 receives the plurality of received packets and the error information from the MFP 100. To get. In the next step S03, the device information of the MFP 100 is acquired.

In the next step S04, a virtual device that simulates the MFP 100 is set. Specifically, based on the CPU information and hardware information included in the device information acquired in step S03, the CPU 171 and hardware resources mounted on the MFP 100 are set in the virtual device, and the hardware parameters are set in the virtual device. do. Further, using the software information included in the device information, the software resource executed by the CPU 171 of the MFP 100 is installed in the virtual CPU 301 of the virtual device, and the software parameters are set in the virtual device.

In the next step S05, the variable i is set to "1" and the process proceeds to step S06. The variable i is a value for specifying the received packet to be processed among the plurality of received packets received in step S02. Specifically, the i-th received packet is set as the processing target.

In step S06, the body of the i-th received packet is added to the processing data. The processed data is data targeted for transmission to the PC 400 by the MFP 100, and is divided and included in each of a plurality of received packets. In the next step S07, it is determined whether or not the (i + 1) th received packet exists among the plurality of received packets acquired in step S02. If such a received packet exists, the process proceeds to step S08, otherwise the process proceeds to step S09. By repeating the loop of steps S05 to S08, a plurality of bodies included in each of the plurality of received packets are sequentially added to the processed data, and the processed data is completed.

In step S09, the processing data is divided. The number of divisions may be determined in advance. Hereinafter, a plurality of divided parts of the processed data are referred to as a plurality of divided parts. In the next step S10, the selection number M is set to "1". In the next step S11, the division subset of the selection number M is determined. There are as many divided subgroups of the selected number M as the number of combinations for selecting M from the plurality of divided portions, and each divided subset includes M divided portions. When the number of selections M is set to "1", since each of the plurality of divided portions is included in one divided subset, the same number of divided subsets as the plurality of divided portions are determined.

In the next step S12, one of the plurality of divided subsets determined in step S11 is selected as the processing target, and the process proceeds to step S13. In step S13, the change packet generation process is executed, and the process proceeds to step S15. The details of the change packet generation process will be described later, but it is a process of generating a plurality of change packets in which a plurality of received packets are changed based on the M division portions included in the division subset selected as the processing target.

In step S15, a plurality of change packets generated in the change packet generation process are received by the virtual device set in step S04, and the process proceeds to step S16. In step S16, it is determined whether or not all the reception of the plurality of change packets has been completed in the virtual device. If all transmissions of the plurality of change packets are completed, the process proceeds to step S17, otherwise the process proceeds to step S18. If an error occurs in the virtual device before all of the plurality of change packets are received, the process proceeds to step S18 assuming that all transmissions of the plurality of change packets are not completed.

In step S17, it is determined whether or not the same error as the error indicated by the error identification information acquired in step S02 has occurred in the virtual device. If true, the process proceeds to step S20, but if false, the process proceeds to step S18.

In step S18, it is determined whether or not there is a division subset that is not selected as the processing target in step S12 among the one or more division subsets determined in step S11. If there is an unselected split subset, the process returns to step S12, and if there is no unselected pair, the process proceeds to step S19. In step S19, the number of selections M is incremented, and the process returns to step S11.

In step S20, the change packet is determined as the reproduction packet, and the process proceeds to step S21. In step S21, the reproduction packet is transmitted to the verification server 500, and the process ends.

FIG. 9 is a flowchart showing an example of the flow of the change packet generation process. The change packet generation process is a process executed in step S13 of FIG. The split subset to be processed is selected before the change packet generation process is executed. The divided subset to be processed includes the divided portion of M selected numbers. Here, the divided portion of M selections included in the divided subset of the processing target is referred to as the divided portion of the processing target.

With reference to FIG. 9, the CPU 201 sets the variable i to “1” in step S31, and proceeds to the process in step S32. The variable i is a value for specifying the received packet to be processed among the plurality of received packets received from the MFP 100.

In the next step S32, the i-th received packet is selected as the processing target. Then, the same header as the header of the i-th received packet is set in the i-th change packet. In the next step S34, it is determined whether or not the body of the i-th received packet includes at least one of the divided portions to be processed. If the body of the i-th received packet includes at least one of the M divided portions included in the divided subset, the process proceeds to step S35, otherwise the process proceeds to step S36. In step S35, the division portion included in the body of the i-th received packet is set in the i-th change packet, and the process proceeds to step S37. In step S36, the body of the i-th change packet is set to empty, and the process proceeds to step S37. For example, NULL is set in the body of the i-th change packet.

In step S37, it is determined whether or not the divided portion set in the body of the i-th change packet contains confidential information. If the divided portion contains confidential information, the process proceeds to step S38, otherwise the process proceeds to step S40. Confidential information is information predetermined as highly confidential information. Examples of confidential information include user accounts, passwords, personal information, and the like. In step S38, the confidential information is changed to dummy information, and the process proceeds to step S39. This makes it possible to prevent the modified packet from containing sensitive information. In step S39, the dummy information is reflected in the virtual device. For example, the authentication process is executed by the user account and password, but the virtual device is set so that the authentication succeeds by the dummy user account and password included in the change packet. For example, add a dummy user account and password to the table used by the virtual device for the authentication process. Also, set so that an error does not occur in the authentication process by the virtual device.

In the next step S40, the header of the i-th change packet is modified, and the process proceeds to step S41. Specifically, the header of the i-th change packet is modified so that the divided portion fits the set body. If the size of the body has been changed, change the field indicating the size of the body to a value that matches the size of the body.

In the next step S41, it is determined whether or not the (i + 1) th received packet exists. If there is a received packet that has not been selected as the processing target in step S32 among the plurality of received packets, the process proceeds to step S42, but if not, the process returns to the verification data generation process. In step S42, the variable i is incremented and the process returns to step S32.

<Example>
For example, a case where the PC 400 acquires the data stored in the shared folder of the MFP 100 based on the protocol of SMB (Server Message Block) will be described as an example. In this case, the PC 400 sends a first request to the MFP 100 to negotiate a capacity exchange. The MFP 100 receives the first request from the PC 400 and returns MORE_REQUIRED as a response indicating that further processing is required. The PC 400 sends a second request containing the information necessary for authentication in the MFP 100, and the MFP 100 returns LOGIN_SUCCESS as a response indicating that the authentication is successful.

Then, the PC 400 transmits a Tree Connect Request as a third request specifying the path of the file stored in the shared folder in order to access the shared folder included in the HDD 113 included in the MFP 100. In the MFP100, if the file specified by the Tree Connect Request does not exist, or if the MFP100 cannot recognize the file even though the file exists, an error occurs in the MFP100. In this case, the MFP 100 returns PATH_NOT_FOUND as a response indicating that the file specified by the Tree Connect Request does not exist. When the PC 400 receives the response of PATH_NOT_FOUND, it sends a request for terminating the SMB communication, and the MFP 100 returns a response to end the communication.

By the time an error occurs in the MFP 100, the first request to the third request have been received from the PC 400. In this case, if the MFP 100 transmits the packets of the first request to the third request received from the PC 400 and the error identification information of the error that has occurred to the internal server 200, the internal server 200 will be the first. A first change packet to a third change packet are generated from a plurality of packets for each of the requests to the third request. In this case, since the second request includes the information required for authentication, the second change packet changes the information required for authentication included in the second request as dummy information. The internal server 200 further causes the virtual device simulating the MFP 100 to receive the first change packet to the third change packet in order, and after the virtual device receives the third change packet, it is identified by the error identification information. When the same error as the above error occurs in the virtual device, the first to third change packets are determined as reproduction packets. However, in the internal server 200, the authentication table is changed so that an error does not occur in the authentication using the dummy information included in the second change packet.

Further, a case where the PC 400 writes data to the shared folder of the MFP 100 based on the SMB protocol will be described as an example. In this case, the PC 400 sends a first request to the MFP 100 to negotiate a capacity exchange. The MFP 100 receives the first request from the PC 400 and returns MORE_REQUIRED as a response indicating that further processing is required. The PC 400 sends a second request containing the information necessary for authentication in the MFP 100, and the MFP 100 returns LOGIN_SUCCESS as a response indicating that the authentication is successful.

Then, when the PC 400 sends a fourth request specifying the path of the shared folder in order to acquire the information stored in the shared folder of the HDD 113 included in the MFP 100, the MFP 100 causes the files and the like stored in the shared folder and the like. Information is returned to the PC400.

Next, when the PC 400 sends a Create Request as a fifth request to generate the file in the shared folder in order to save the file in the shared folder, the MFP 100 returns a response.

Subsequently, the PC 400 transmits a Write Request as a sixth request including the file data. Here, if the remaining capacity of the HDD 113 in the MFP 100 is insufficient, or if the file cannot be saved due to a failure to write data to the HDD 113, the MFP 100 returns DATA_ERROR as a response indicating that an error has occurred during data writing. When the PC 400 receives the response of DATA_ERROR, the PC 400 sends a request for terminating the SMB communication, and the MFP 100 returns a response to end the communication.

By the time an error occurs in the MFP 100, the first request, the second request, and the fourth request to the sixth request have been received from the PC 400. In this case, if the MFP 100 transmits the packets of the first request, the second request, the fourth request to the sixth request, and the error identification information of the generated error to the internal server 200, the internal server Reference numeral 200 denotes a plurality of packets for each of the first request, the second request, the fourth request to the sixth request, the first change packet, the second change packet, and the fourth change packet to the sixth change. The virtual device that generates the packet and simulates the MFP 100 receives the first change packet, the second change packet, the fourth change packet to the sixth change packet in order, and the virtual device receives the sixth change packet. After receiving, if the same error as the error specified in the error identification information occurs in the virtual device, those first change packet, second change packet, fourth change packet to sixth change packet are sent. , Determine the packet for reproduction.

As described above, the internal server 200 in the present embodiment generates a change packet from the received packet transmitted from the PC 400 to the MFP 100 when an error occurs in the MFP 100 that receives a plurality of packets from the PC 400, and generates the MFP 100. The change packet is received by the virtual device to be simulated, and the change packet when the same error as the error generated in the MFP 100 occurs in the virtual device is determined as the reproduction packet. Therefore, it is possible to generate a change packet that includes at least a part of the received packet transmitted from the PC 400 to the MFP 100 and causes the same error as when the MFP 100 receives the received packet. Therefore, when data is transmitted from the PC 400 to the MFP 100, the error that occurs in the MFP 100 can be reproduced, and the reproduction data having a smaller size can be generated.

Further, since the internal server 200 transmits the reproduction packet to the verification server 500, the error generated in the MFP 100 can be reproduced in the verification server 500, and the error can be verified.

Further, the internal server 200 acquires one or more packets determined by the unit of data to be processed by the MFP 100 or the unit of processing in which the MFP 100 processes data as received packets. The unit of data is a page unit when the data consists of a plurality of pages, and includes one page of data. The unit of processing includes data to be transmitted from the start to the end of one process. For example, a plurality of files are included in a data transmission process for transmitting a plurality of data. Since the received packet is one or more packets determined by the unit of data or the unit of processing, it is not necessary to store all the packets transmitted by the MFP 100 in the HDD 113, and the memory resource can be effectively used. Further, in the verification server 500, it becomes easy to reproduce an error generated in a process executed for one data or an error generated in one process at the time of verification.

Further, since the internal server 200 rewrites the confidential information of the received packet into dummy information, it is possible to prevent the changed packet from including highly confidential information.

Further, since the internal server 200 rewrites the portion including the predetermined type of data in the received packet and / or the predetermined portion with dummy information, the changed packet does not include highly confidential information. Can be done. In particular, if the type of sensitive information contained in the received packet or the position in the received packet is known in advance, the modified packet can be prevented from containing highly sensitive information.

Further, since the internal server 200 divides the processing data into a plurality of divided portions and generates a change packet from one or more divided portions selected from the plurality of divided portions, the change packet is a plurality of divided portions. Since it contains one or more divided parts selected from among them, a part of the received packet is deleted. Therefore, the amount of data in the modified packet can be smaller than that in the received packet.

Further, when the internal server 200 has a plurality of received packets, the internal server 200 generates a plurality of change packets corresponding to the plurality of received packets, so that the reproduction packet can be easily determined.

In the above-described embodiment, the internal server 200 is shown as an example of the server, but the reproduction data generation method for causing the internal server 200 to execute the reproduction data generation processing shown in FIGS. 6 and 7. Needless to say, the invention can be regarded as a reproduction data generation program in which the CPU 201 included in the internal server 200 executes the reproduction data generation method.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Information processing system, 100 MFP, 200 Internal server, 300 PC, 500 Verification server, 3 LAN, 5 Internet, 111 CPU, 112 Communication I / F, 113 ROM, 114 RAM, 115 HDD, 116 Facsimile unit, 117 External storage Equipment, 200 internal server, 201 CPU, 202 ROM, 203 RAM, 204 HDD, 205 communication unit, 206 display unit, 207 operation unit, 208 external storage device, 209 CD-ROM, 51 processing execution unit, 53 communication control unit, 55 Defect detection unit, 57 packet storage unit, 59 verification request unit, 251 device information acquisition unit, 253 packet acquisition unit, 255 error information acquisition unit, 257 simulation unit, 259 virtual execution control unit, 261 generation unit, 263 reproduction Packet determination unit, 265 output unit.

Claims (9)

A simulation means that simulates an image forming device, and
When an error occurs in the image forming apparatus after the image forming apparatus receives a received packet from the outside, an acquisition means for acquiring the received packet and error information indicating the error, and an acquisition means.
Based on the information in the header part of the plurality of received packets, the bodies of the plurality of received packets are combined to generate the processed data, and the modified packet is based on at least one of the plurality of divided portions in which the processed data is divided. And the generation means to generate
A virtual execution control means in which the simulation means causes a virtual device that simulates the image forming apparatus to receive the change packet, and a virtual execution control means.
A server including a packet determining means for determining a modified packet as a reproduction packet when an error indicated by the error information occurs when the virtual device receives a modified packet generated by the generating means. The server according to claim 1, further comprising an output means for outputting the reproduction packet to the outside. The acquisition means acquires, as the received packet, one or more packets determined by the unit of data to be processed by the image forming apparatus or the unit of processing in which the image forming apparatus processes data. Or the server described in 2. The server according to any one of claims 1 to 3, wherein the generation means generates the change packet by rewriting the predetermined confidential information of the received packet into dummy information. The server according to claim 4, wherein a part of the received packet is a part containing a predetermined type of data and / or a predetermined part. The server according to any one of claims 1 to 5, wherein the generation means generates the change packet by deleting a part of the received packet. The server according to any one of claims 1 to 6, wherein the generation means generates a plurality of the modified packets corresponding to the plurality of received packets when the number of received packets is a plurality. A simulation step that simulates an image forming device, and
When an error occurs in the image forming apparatus after the image forming apparatus receives a received packet from the information processing apparatus, an acquisition step of acquiring the received packet and error information indicating the error, and an acquisition step.
Based on the information in the header part of the plurality of received packets, the bodies of the plurality of received packets are combined to generate the processed data, and the modified packet is based on at least one of the plurality of divided portions in which the processed data is divided. And the generation steps to generate
A virtual execution control step of causing the virtual device simulating the image forming device to receive the change packet,
When the virtual device receives the change packet generated in the generation step, and the virtual device generates the error indicated by the error information, the server determines the change packet as the reproduction packet. Data generation method for reproduction to be executed by. A simulation step that simulates an image forming device, and
When an error occurs in the image forming apparatus after the image forming apparatus receives a received packet from the information processing apparatus, an acquisition step of acquiring the received packet and error information indicating the error, and an acquisition step.
Based on the information in the header part of the plurality of received packets, the bodies of the plurality of received packets are combined to generate the processed data, and the modified packet is based on at least one of the plurality of divided portions in which the processed data is divided. And the generation steps to generate
A virtual execution control step of causing the virtual device simulating the image forming device to receive the change packet,
When the virtual device receives the change packet generated in the generation step and the virtual device generates the error indicated by the error information, the computer determines the change packet as the reproduction packet. A data generation program for reproduction that is executed by.

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