KR20030037917A - TFTP File Downloading Method - Google Patents

Abstract

PURPOSE: A TFTP(Trivial File Transfer Protocol) file downloading method is provided to allot only a memory size exactly, requested to be downloaded, for efficiently using a RAM by using the TFTP. CONSTITUTION: The method comprises several steps. A client, having a flash memory, connects to a server, and requests a download of a specific file by transmitting a file name to the server(S41). The server searches for the requested file, and decomposes the file into packets(S42). The server transmits to the client the first packet where file size data is stored at the upper four bytes and a part of real file data is stored at the remaining 504 bytes(S43). The client extracts the file size data from the transmitted first packet(S44), compares the file size data with an unused RAM size, and determines whether only the remaining RAM size can be alloted as a temporary memory area for storing the file to be downloaded(S45). If the remaining RAM size is enough to store the file, a necessary area among the remaining RAM area is alloted as a temporary memory area(S46), but if the remaining RAM size is not enough, a flash memory size is checked and a necessary area among the flash memory area is alloted as a temporary memory area(S47). The client continuously receives the decomposed packets, and sequentially stores them at the alloted temporary memory area(S48). The client checks a completion of the file transmission(S49), and stores the file, stored at the temporary memory area, at specific addresses of the flash memory(S50).

Description

TFTP File Downloading Method}

The present invention relates to a Trivial File Transfer Protocol (TFTP) download, and in particular, when a specific file is downloaded using TFTP, the TFTP server transmits file size information to be downloaded to the TFTP client to enable more efficient TFTP file download. Relates to a TFTP file download method.

In general, data on most systems is represented in units of files, and in order to transfer data between networked systems, you usually need to transfer files or portions of files.

And in order for a user of one system to receive data from another system to his system or to transfer data from his system to another system, there must be a protocol for communication between the systems. Such protocols include File Transfer Protocol (FTP), Terminal Emulation Protocol (Telnet), and HyperText Transfer Protocol (HTTP) based on Transfer Control Protocol / Internet Protocol (TCP / IP).

In addition, TCP / IP provides two standard protocols for transferring the entire contents of a file between systems: one is the File Transfer Protocol (FTP) and the other is the Trivial FTP. TFTP).

Here, TFTP is a kind of FTP designed to be implemented with simpler and smaller code than FTP, and is commonly used as a protocol for downloading an operating system image in a diskless system.

As illustrated in FIG. 1, the download system using the TFTP includes a TFTP client 11 requesting to download a specific file, and a TFTP server 12 that finds and sends a file in response to a request of the TFTP client 11. ) Are connected to the network and download files.

The file download operation of the above-described TFTP download system will be described with reference to FIG. 2.

First, after connecting with the TFTP server 12, the TFTP client 11 transmits a file name to be downloaded to the TFTP server 12 to request the download of a specific file (step S21).

Then, the TFTP server 12 finds and transmits the file requested by the TFTP client 11, at which time the file is decomposed into 512 byte packet units and transmitted to the TFTP client 11 (step S22). .

At this time, since the TFTP client 11 needs a temporary memory space for temporarily storing the downloaded file in the RAM memory regardless of the size of the file requested by the TFTP client 11 (step S23), the TFTP client 11 is allocated a TFTP area. The packet transmitted from the server 12 is stored in order in the already allocated memory area (step S24).

Then, it is checked whether the file download from the TFTP server 12 is completed (step S25), and when the file download is completed, the connection with the TFTP server 12 is released, and the TFTP client 11 temporarily stores the RAM memory. The downloaded file, that is, the downloaded file is stored in a specific flash memory address (step S26).

As described above, when a file is downloaded using a conventional TFTP, a RAM memory space is required to temporarily store the downloaded file on the TFTP client side, and thus, the free space of the RAM memory is smaller than the space for downloading the file. There was a problem that an error occurred and the file could not be downloaded using TFTP, and if this phenomenon was repeated, there was a problem in that the RAM memory area had to be added in hardware.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. The object of the present invention is to provide a file size information requested by a TFTP client by the TFTP server, so that only RAM memory corresponding to the file size at the time of TFTP download is available in the temporary memory area. It can be used to make more efficient use of RAM memory.

In addition, another object of the present invention is to provide a temporary memory that is not used by the flash memory only when the TFTP client manages the flash memory usage area information and cannot allocate temporary memory required for TFTP download using only the RAM memory. By allocating to the memory area, the TFTP download can be performed even when the RAM memory is insufficient during the TFTP download.

1 is a schematic structural block diagram of a download system using a conventional TFTP.

2 is a flowchart of a file download operation of a conventional TFTP download system.

3 is a schematic structural block diagram of a download system using a TFTP according to the present invention;

4 is a flowchart illustrating a file download operation of the TFTP download system according to the present invention.

Explanation of symbols on the main parts of the drawings

31: TFTP Client 32: TFTP Server

A feature of the present invention for achieving the above object is, in the file download method using a TFTP, the TFTP server to transfer the size information of the file requested to be downloaded from the TFTP client in the first data packet to the TFTP client and; Allocating a temporary memory area corresponding to the file size information after extracting file size information from a first data packet transmitted from the TFTP server; The present invention provides a method for downloading a TIF file including storing a data packet transmitted from the TFTP server in a temporary memory area and storing the data packet in a specific flash memory address when the file download is completed.

The TFTP file download method may further include storing and managing usage area information of its own flash memory in a separate memory or a table in the TFTP client.

On the other hand, the step of transmitting the file size information requested for download in a first data packet to a TFTP client, if the TFTP client requests the download of a specific file, the step of decomposing the download request file in packet units; And sending file size information to the TFTP client in the upper 4 bytes of the decomposed first data packet.

The process of allocating a temporary memory area corresponding to the file size information may include extracting file size information requested for download from a first data packet received from the TFTP server; Comparing the extracted file size information with an unused RAM memory size to determine whether temporary memory allocation for TFTP download is possible using only RAM memory; Allocating a temporary memory area corresponding to a file size requested for downloading with only RAM memory, when temporary memory allocation is possible using only RAM memory, and flash memory using area when temporary memory allocation is not possible using only RAM memory. The method may further include allocating an unused area of the flash memory to a temporary memory area lacking only the RAM memory area with reference to the information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As illustrated in FIG. 3, the download system using the TFTP according to the present invention has a structure in which the TFTP client 31 and the TFTP server 32 are connected to each other in a network to download files, and the TFTP client 31. ) Stores and manages flash memory usage area information indicating how flash memory is currently used in a separate memory or table.

In this case, when the TFTP client 31 requests the download of a specific file, the TFTP server 32 decomposes the corresponding file into packet units of a predetermined size and transmits it, but the TFTP client loads the size information of the requested file in the first packet. Transfer to 31.

The TFTP client 31 receives the size information of the file requested by the TFTP server 32 from the TFTP server 32 and allocates a temporary memory area at the time of file download. Only the temporary memory area is allocated, and if the RAM memory area is insufficient, the area not used in the flash memory is allocated to the temporary memory which is insufficient when the file is downloaded by referring to the flash memory use area information to perform the file download using TFTP.

Meanwhile, the file download operation of the above-described TFTP download system will be described with reference to FIG. 4.

First, the TFTP client 31 having the flash memory connects to the TFTP server 32 and transmits a file name to be downloaded to the TFTP server 32 to request the download of a specific file (step S41).

Then, the TFTP server 32 finds and transmits the file requested by the TFTP client 31. At this time, the file is decomposed into 512 byte packets and transmitted to the TFTP client 31. The size information of the requested file is loaded and transmitted.

That is, the TFTP server 32 finds the file downloaded by the TFTP client 31, decomposes it into packet units of 512 bytes (step S42), and then loads file size information in the upper 4 bytes of the first packet, and then the TFTP client 31 (Step S43). In this case, 508 bytes of actual file data are loaded in addition to the file size information of 4 bytes.

Then, when the TFTP client 31 receives the first packet after requesting the TFTP server 32 to download a specific file, the TFTP client 31 extracts the file size information requested for the download from the first packet received (step S44), and downloads the file. Allocate a temporary memory area for the system.

At this time, the TFTP client 31 compares the file size information extracted from the first packet with the unused RAM memory size and checks whether a temporary memory area corresponding to the file size requested by the TFT is allocated to the RAM memory area only ( Step S45), the temporary memory corresponding to the file size requested by the RAM memory only when the non-used RAM memory area larger than the size of the file requested for download exists, i.e., when the temporary memory area allocation required for file download is possible only by the RAM memory area. An area is allocated (step S46).

However, if the RAM memory area alone does not allow temporary memory area allocation for file download, that is, if the RAM memory area is insufficient, the RAM memory area may not be used for file download by referring to the flash memory usage area information. By allocating the temporary memory that is insufficient only in the memory area (step S47), if the temporary memory area necessary for file download cannot be allocated only by the RAM memory area, the temporary memory area that is insufficient after the memory is allocated to the RAM memory area is flashed. It allocates and uses the unused area in memory. At this time, not only the flash memory but also any storage medium capable of temporarily recording and reading data may be used. In this case, it is necessary to manage use area information of the corresponding storage medium.

Then, the TFTP client 31 allocates the temporary memory area necessary for downloading the file, and then sequentially stores the packet to be continuously transmitted from the TFTP server 32 in the allocated temporary memory area (step S48). It is checked whether the file download from the server 12 is completed (step S49), and when the file download is completed, the connection with the TFTP server is disconnected, and the file stored in the temporary memory area is stored in a specific flash memory address ( Step S50).

On the other hand, even if the RAM memory area and the area not used in the flash memory are combined in the present invention, the TFTP file download cannot be performed when the temporary memory area required for file download cannot be allocated.

In addition, the embodiment according to the present invention is not limited to the above-described embodiments, and various alternatives, modifications, and changes can be made within the scope apparent to those skilled in the art.

As described above, the present invention transmits the file size information requested by the TFTP client to the TFTP server so that only RAM memory corresponding to the file size can be allocated to the temporary memory area at the time of TFTP download. This becomes possible.

In addition, in the present invention, when the RAM memory alone cannot allocate temporary memory required for TFTP download, the TFTP client manages flash memory usage area information, so that an area not used in the flash memory is replaced with a temporary memory area insufficient only by the RAM memory. Can be assigned, thereby enabling TFTP download.

Claims (5)

In the file download method using TFTP, Transmitting, by the TFTP server, the size information of the file requested to be downloaded from the TFTP client to the TFTP client by loading the first data packet; Allocating a temporary memory area corresponding to the file size information after extracting file size information from a first data packet transmitted from the TFTP server; And storing the data packet transmitted from the TFTP server in a temporary memory area and storing the data packet in a specific flash memory address when the file download is completed. The method of claim 1, And storing, by the TFTP client, usage area information of its own flash memory in a separate memory or table. The method of claim 1, The process of transmitting the requested file size information in a first data packet to a TFTP client may include: decomposing the downloaded file into packet units when the TFTP client requests to download a specific file; And transmitting the file size information to the TFTP client in the upper 4 bytes of the first data packet decomposed. The method of claim 1, Allocating a temporary memory area corresponding to the file size information may include extracting file size information requested for download from a first data packet received from the TFTP server; Comparing the extracted file size information with an unused RAM memory size to determine whether temporary memory allocation for TFTP download is possible using only RAM memory; And allocating a temporary memory area corresponding to a file size requested for downloading with only RAM memory when temporary memory allocation is possible using only RAM memory. The method of claim 4, wherein In the step of checking whether the temporary memory allocation required for TFTP download is possible using only the RAM memory, when the temporary memory allocation is not possible using only the RAM memory, the RAM memory may be stored in the RAM memory by referring to flash memory usage area information. And a step of allocating a temporary memory area that is insufficient for the area only.