KR20040038271A - Method for compress and uncompress of file - Google Patents

Abstract

PURPOSE: A method for compressing/decompressing a file is provided to reduce a size of software minimally by compressing all files to be downloaded, and perform the service initiation more fast by effectively using a limited communication path resource and shortening a loading time. CONSTITUTION: After reading a data file, the compression of the read data file is checked(ST12). In case of the compressed file, an error message is displayed and the data file is compressed if not(ST14). After compressing the data file, the user header information is additionally inputted to the generated file(ST18). A header is connected/registered. A header file and the compressed file are merged(ST21).

Description

Method for compress and uncompress of file}

The present invention connects and registers additional information that an application can use in a basic compression and decompression algorithm provided in a real-time OS (RT-OS) when compressing and decompressing a file in the form of a header in a compressed file. The present invention relates to a method of compressing and decompressing a downloaded compressed file at an application level. In particular, a file used for downloading is provided at an RT-OS (VxWorks) level. Compression is performed using a compression algorithm, and new additional information headers are registered in the compressed file generated through the basic compression, and decompression is performed in a specific memory area by using the header information when decompression. After that, the uncompressed application is loaded and used in a predetermined area, thereby compressing the file at the application level instead of the OS level. The present invention relates to a method of compressing and decompressing a file to enable axis and decompression, and to enable compression loading of all downloaded applications.

In general, compression loading according to the prior art compresses a file with a compression tool provided on an RT-OS (VxWorks) to download the file, and releases the downloaded compressed file at an OS level. Then it was used in the memory.

Here, in the prior art, the release of the compressed file is possible only at the OS level, and thus the range of the compressed loading file is limited.

Therefore, there are more applications that cannot compress than applications that receive compression loading, which in turn limits the loading time to a minimum.

In addition, when releasing a compressed file using an existing method from an application block other than an OS, the information on the starting address at which the compressed file is to be decompressed is unique. Area was allocated.

Therefore, inefficient memory occupancy has caused a waste of memory, thereby making it difficult to utilize resources, causing performance degradation of the respective boards.

In particular, in the case of a processor in which many applications are downloaded, such as a Call Control Processor (CCP), there is a problem in that memory waste occurs more severely.

Accordingly, the present invention is proposed to solve the above problems of the prior art,

An object of the present invention is to enable the compression and decompression of a file, which was only possible within a specific part such as RT-OS (VxWorks), at the application level through encoding and decoding (Encoding & Decoding). It provides a method of compressing and decompressing files to reduce the size of the software by minimizing the size of the software, and to use the limited communication path resources more efficiently and to reduce the loading time so that the service can be started faster. There is.

File compression method according to the present invention for achieving the above object,

After reading the data file, checking whether the read data file is compressed;

If the file is a compressed file as a result of the checking, displaying an error message and performing file compression if the file is not a compressed file as a result of the checking;

After compressing the file, checking whether the compression is successfully completed, displaying an error message in case of abnormality, and inputting user header information to the generated file if the file compression is normal;

Checking whether the information input is normally performed after inputting the header information, displaying an error message if the input is abnormal, and registering the header if the input is normal;

After the header connection registration, checking whether the connection registration is completed normally, displaying an error message when the connection registration is abnormal, and merging the header file and the compressed file when the connection registration is normal;

After performing the file merging, it is checked whether the merging is completed successfully, and as a result, an error message is displayed when the file merging fails, and the file compression process is terminated when the file merging is successful. It features.

In addition, the file decompression method according to the present invention for achieving the above object,

After reading the compressed data file, determining whether the read data file is a compressed file;

Displaying an error message if the file is not a compressed file as a result of the determination, and checking whether a cyclic redundancy check (CRC) is performed if the file is compressed as a result of the determination;

Displaying an error message if the CRC is not checked and disconnecting the header file if the CRC is the checked file, and confirming success;

Displaying an error message when the disconnection of the confirmation result is unsuccessful, and decompressing the file if the disconnection of the confirmation result is successful;

After decompressing the file, checking whether decompression is completed successfully, displaying an error message if decompression fails, and loading a file from memory if decompression is successful;

The method may include checking whether the file is loaded successfully after loading the file, displaying an error message if the file fails to be loaded, and terminating the file decompression process if the file is loaded successfully.

1 is a view showing the configuration of a header file for explaining the present invention,

2 is a block diagram illustrating a file compression and decompression process according to the present invention;

3 is a flowchart showing in detail a file compression sequence according to the present invention;

4 is a flowchart illustrating a file release procedure according to the present invention in detail.

<Explanation of symbols for the main parts of the drawings>

100 ..... Base Station Manager

200 ..... Target Board

Hereinafter, a preferred embodiment of the "file compression and decompression method" of the present invention according to the above technical concept will be described in detail with reference to the accompanying drawings.

1 is a diagram showing the configuration of a header file for explaining the present invention.

First of all, the present invention compresses a file used for downloading through a compression algorithm provided by RT-OS (Real Time OS) and inputs user header information to a file generated through basic compression. When decompressing, the decompression is performed in a specific memory area using the header information, and then the decompressed application is loaded and used in a predetermined area.

In this case, the contents attached to the compressed file as headers are attached to the original file size, version, and file type as shown in the configuration of the header file shown in FIG. 1. ), Compressed File CRC of Compressed File, Compressed File Size, etc.

Through this, after the compressed file is downloaded from the lower board, whether the downloaded compressed file is a normal compressed file, whether the packet is normally loaded without breaking during downloading, and the downloaded file Determines how much space to decompress and allocate in memory.

Here, the cyclic redundancy check (CRC) is a type of error detection method used for group error detection during data transmission, and the error is detected by using a polynomial code for error detection in addition to the minimum bits necessary to represent data. This is how you check.

2 is a block diagram illustrating a file compression and decompression process according to the present invention.

As shown in the figure, compression of a file is performed through a compression tool provided by the RT-OS, and generated through the basic compression of an uncompressed original file in the BSM (Base Station Manager) 100. In addition to the file, the user header is attached to create a compressed file with the header added to the 40-byte header using the RT-OS tool.

On the other hand, after file download, file decompression on the target board 200 decompresses the 40-byte header to decompress the specific memory area, and then decompresses the predetermined area. Load it and use it.

That is, through the present invention as described above, all files to be downloaded from the base station manager (BSM) can be compressed and decompressed, thereby reducing the number of loading packets when loading to reduce communication path resource. Efficient use and unnecessary resource occupancy can be prevented, and the loading time can be reduced to a minimum, thereby speeding up system service start time as soon as possible.

Figure 3 is a flow chart showing in detail the file compression sequence according to the present invention.

As shown therein, reading the data file (ST11), checking whether the read data file is a compressed file (ST12); Displaying an error message if the file is compressed as a result of the check (ST13); compressing the file if the file is not a result of the check (ST14); and checking whether the compression is normally completed after the file is compressed. (ST15), and if the file compression is abnormal as the result of the verification, display an error message (ST13), and if the file compression is normal as the result of the verification, inputting user header information to the generated file (ST16); After inputting header information, checking whether the information input is normally performed (ST17); displaying an error message when the check result input is abnormal (ST13), and registering and registering a header when the check result input is normal ( ST18), and after the header connection registration, checking whether the connection registration is normally completed (ST19); If the connection registration is abnormal as a result of the confirmation, an error message is displayed (ST13). If the connection result is OK, the merging of the header file and the compressed file is performed (ST20), and the merge is completed successfully. In step ST21, if the check result file merge fails, an error message is displayed (ST13), and if the check result succeeds, the file compression process is terminated.

4 is a flowchart illustrating a file release procedure according to the present invention in detail.

As shown therein, a step ST31 of reading a compressed data file, a step of checking whether the read data file is compressed (ST32), an error message is displayed (ST33) if the check result is not a compressed file, If the file is a compressed file as a result of the check, the method checks whether a CRC (Cyclic Redundancy Check) has been performed (ST34); if the CRC is not performed as a result of the check, an error message is displayed (ST33); Disconnecting the header file (ST35), checking whether the disconnection is completed successfully after the disconnection (ST36), and if the check result fails, display an error message (ST33), and confirm the check result. If the connection is successful, decompressing the file (ST37), and after decompressing the file, to determine whether the decompression was completed successfully In step ST38, if the decompression of the verification result is unsuccessful, an error message is displayed (ST33). If decompression is successful, the loading of the file from the memory (ST39), and after the file is loaded, A step of checking whether the loading is successful (ST40), an error message is displayed when the loading of the check result fails (ST33), and the file decompression process is terminated when the loading of the check result is successful.

That is, according to the present invention having the above-described configuration, headers in the compressed file include additional information that can be used by the application in the basic compression and decompression algorithm provided in the RT-OS (Real Time OS) when the existing file is compressed and decompressed. By attaching in the form of (header), it is possible to compress and decompress the downloaded compressed file at the application level. More specifically, the file used for downloading can be set at RT-OS (VxWorks) level. Compression is performed using a compression algorithm provided in the above), and new additional information headers are connected and registered in the compressed file generated through the basic compression. After decompressing the file, the uncompressed application is loaded and used in the designated area so that the application is not OS level. This is to enable the file compression and decompression in the level, the compression load of all applications that are downloaded to the enable.

According to the above-described "file compression and decompression method" of the present invention, the application level through the encoding and decoding of the compressed file (Encoding & Decoding) the file compression, decompression that was possible only within a specific portion, such as RT-Os (VxWorks) By enabling all the files that are to be downloaded, the software can be compressed to a minimum size, which allows for faster system start-ups by more efficient use of limited communication path resources and shorter loading times. Has the advantage to be performed.

In addition, the present invention can compress and decompress all files to be downloaded from a base station manager (BSM) to a lower board, thereby reducing the number of loading packets when performing a loading, thereby communicating communication resource. It has the advantage of preventing the efficient use of resources and unnecessary resource occupation.

Claims (2)

In the file compression method, Reading a data file and checking whether the read data file is compressed; If the file is a compressed file as a result of the checking, displaying an error message and performing file compression if the file is not a compressed file as a result of the checking; After the file compression, checking whether the compression is successfully completed, displaying an error message in case of abnormality, and inputting user header information to the generated file when the file compression is normal; Checking whether the information input is normally performed after inputting the header information, displaying an error message if the input is abnormal, and registering and registering the header if the input is normal; After the header connection registration, checking whether the connection registration is completed normally, displaying an error message when the connection registration is abnormal, and merging the header file and the compressed file when the connection registration is normal; And after the file merging is performed, checking whether the merging is completed successfully, displaying an error message when the file merging is unsuccessful, and terminating the file compression process when the file merging is successful. How to compress and decompress files. In the file decompression method, Reading a compressed data file and determining whether the read data file is a compressed file; Displaying an error message if the file is not a compressed file as a result of the determination, and checking whether a cyclic redundancy check (CRC) has been performed if the file is compressed as a result of the determination; Displaying an error message if the CRC is not determined as a result of the check, disconnecting the header file if the file is the CRC as a result of the check, and checking whether the CRC is successful; Displaying an error message if the connection is unsuccessful as a result of the confirmation, and decompressing the file if the connection is unsuccessful; After decompressing the file, checking whether decompression is completed successfully, displaying an error message if decompression fails, and loading a file from memory if decompression is successful; Checking whether the loading is successful after loading the file, and if the loading fails, displaying an error message, and if the loading is successful, terminating the file decompression process. Way.