KR100418349B1 - Method for compression and restoration of data - Google Patents

Abstract

The present invention converts the header portion of the file into a complete code so that the compressed Zip file can be used in the general operating system in managing the compressed file in the PDA, and when restoring the compressed file in the general operating system, The present invention relates to a method for compressing and restoring data having compatibility with an existing program by converting the code into a code. The data compression method of the present invention includes selecting a target file to be compressed and completing header information of the target file in a general operating system. Converting the code into a code, compressing the data of the completed code and the compression target file and generating a final compressed file. The method of restoring data includes selecting a compressed file to be restored and a header of the compressed file. Analyzing the information and confirming that the selected file is a compressed file; If it is a file, converting a part of the header information of the file to Unicode, generating a list of files and outputting them to the screen, selecting a file to be restored from the files in the file list, and header information And converting the remainder not converted to Unicode to Unicode, and restoring a file based on the information converted to Unicode.

Description

Method for compression and restoration of data

The present invention relates to file compression and decompression in a personal data assistant (PDA), and more particularly, to a file compression and decompression method compatible with a compressed file management between a general operating system and a PDA.

In general, a personal digital assistant (PDA) is a handheld computer of a small size. The same thing that you can carry with you is the laptop or electronic notebook, which differs from PDAs in that notebook computers usually have the same functionality as a notebook computer in a notebook size, create documents, create reports, and use the Internet. Although it's a computer, PDAs are primarily used for managing schedules, taking simple notes, and managing personal information, while electronic notebooks are primarily used for managing personal information. The difference is that it can be used in fields such as the mobile internet.

In conclusion, PDA is a device that implements various management functions and internet access functions of notebook computer in small size of electronic notebook.

There are four major operating systems in Korea for such PDAs. One is Palm OS made by Palm, Windows CE made by Microsoft, Celvic OS made by Jtel in Korea, and EPOC of Psion. The Palm OS, Cellvik OS, and EPOC are dedicated operating systems for PDAs such as Palm, Cellvik, and Psion Revo, respectively, but Windows CE is used in PDAs of various companies.

The PDA has a different input method from the general computer or electronic notebook because the input and output of characters should be done in a small size. Usually, an electronic pen called a stylus is used to write information directly on a small TFT-LCD screen (handwriting recognition function) or to input information by taking a displayed keyboard with a stylus. Of course, it's not an easy way to get used to it, but you have to use this input method to make it fit in one hand.

In such a PDA, memory, not a storage device such as an HDD, is used as a storage space. The PDA is divided into a ROM portion containing a basic operating system and basic software and a RAM portion storing user files. PDAs like Palm, Visor or Celvic have relatively little memory, but Windows CE-based PDAs have between 16MB and 64MB of RAM that users can store.

In this explosive growth of PDA market, due to the rapid development of wireless Internet, it is possible to transfer data such as mail using PDA, and faster data transmission is possible by reducing the size of transmission data using data compression technique. .

Conventional PDAs, however, use a data compression format called "Zip." Generally, MS-DOS (including Windows) and UNIX (UNIX) operating systems (OS) use complete code and Unicode. In addition, since most general application programs are programmed using completion code, the header of the Zip file (including data related information) also uses completion code.

Nevertheless, Windows CE, which is used as the OS (operating system) of the PDA, supports Unicode only. Zip files created in the general OS (operating system) use the complete code. Therefore, Korean or 2Bytes language system is used. There was a problem that you can not restore the Zip file created by the general operating system in Windows CE of PDA because it cannot support the national language.

The present invention has been made to solve the above problems of the prior art, by converting the header of the file into a complete code to compress the Zip file compressed in the PDA for use in a general operating system to ensure complete compatibility with existing programs It is an object of the present invention to provide a method of compressing data.

Another object of the present invention is to convert the header portion of the Zip file written in the complete code when the compressed file compressed in the general operating system on the PDA to Unicode that can be used in Windows CE, the operating system of the PDA to complete the existing program The present invention provides a method for restoring data that is compatible.

In the data compression method of the present invention for achieving the above object, in the method of compressing data in a PDA, selecting a compression target file to be compressed, the header information of the compression target file can be used in a general operating system And converting the completed code and data of the compressed code and the compression target file to generate a final compressed file.

In addition, the method of restoring compressed data of the present invention is a method of restoring compressed data in a PDA, selecting a compressed file to be restored, analyzing header information of the compressed file, and compressing a currently selected file. Checking whether the file is a compressed file; converting a part of the header information of the file into Unicode if the file is a compressed file; generating a list of the file and displaying the file on the screen; and among the files in the file list. Selecting a file to be restored, converting the remaining information not converted to Unicode out of the header information into Unicode, and restoring the file based on the converted information into Unicode. It features.

1 is a diagram illustrating a code region of Microsoft's integrated Hangul.

2 illustrates a code region of Korean characters included in the Unicode 2.0 version.

3A is a conceptual diagram illustrating a method of compressing data of the present invention.

3b is a conceptual diagram for explaining a method of restoring compressed data according to the present invention;

4 is a detailed flowchart illustrating the data compression method of the present invention.

5 is a detailed flowchart for explaining a data restoration method of the present invention.

6A to 6B are conceptual views illustrating a compression and decompression method of a specific language according to the data compression and decompression method in the present invention.

First, before describing the data compression and decompression method of the present invention, a brief description of Microsoft's integrated Hangul (complete) and Unicode Hangul is as follows.

When using a general PDA, the number of Korean characters that can be represented by 2 bytes is limited to 2350 characters. Microsoft's Window operating system based on this has a problem in expressing such Hangul.

Therefore, Microsoft's integrated Hangul code is proposed as a way to increase the number of Hangul characters that can be represented by 2 bytes and use programs that were originally based on PDAs.

1 illustrates a code region of Microsoft's integrated Hangul, and as shown in the figure, the general code region is left as it is, and the portion corresponding to 0x8141 to 0xC6FE is not included in the code region of the conventional PDA. Hangul characters that cannot be represented by two bytes in PDA are arranged in alphabetical order.

On the other hand, Unicode Hangul is an example. In the Unicode 2.0 version, there are 6,536 characters in code area, of which 38,853 are allocated to implement the languages of major countries. 1,400 characters are allocated as a private use area, and 22,492 are allocated as language areas to be newly added.

For reference, the currently assigned major languages are ASCII, American, Latin, Cyrillic, Hebrew, Symbol, Punctuation, Arabic, Ghana, Hangul, Hangul, and HangulSyllables. ).

In terms of code allocation, the most common is Chinese characters (39.89%), followed by Korean characters 17.04% (11,722 characters), ASCII and symbolic characters 10.39% (6,811 characters). ), And so on.

The design principle of the Unicode 2.0 version is based on 16-bit code, and the complete coding of all languages, the unification of the code system, the equivalence of codes, the compatibility between codes, and the like. Represents the code area of Korean included in the Unicode 2.0 version.

Hereinafter, a method of compressing and restoring data of the present invention will be described with reference to the accompanying drawings.

3A to 3B are conceptual views illustrating a data compression and decompression method of the present invention. FIG. 3A is a diagram for describing a method of compressing data, and FIG. 3B is a method for decompressing compressed data. For reference, it is obvious that data compression and decompression is performed in a PDA.

First, as shown in FIG. 3A, data of the head portion of a file to be compressed (hereinafter referred to as a "target file") is converted into a complete code, and the data converted into a complete code is compressed again using a Zip format. You can get a compressed Zip file.

In this way, by converting the header portion of the target file into a complete code and compressing it using the Zip format, the file compressed by the PDA can be used in a general operating system that supports only the complete code.

In addition, as shown in FIG. 3B, in order to restore a compressed file (zip file) created in a general operating system, the header portion of the compressed Zip file is converted into Unicode supported by Windows CE, which is a PDA operating system. After recovering the compressed file, the original target file can be obtained. In this way, the header of the Zip file can be converted to Unicode, which can be easily restored on a PDA.

Such a method of compressing and restoring data according to the present invention will be described in more detail with reference to a flowchart.

4 is a flowchart illustrating a data compression method according to the data compression and decompression method of the present invention.

As shown in FIG. 4, first, a file or a folder to be compressed is selected in the Windows CE File Explorer which is an operating system of a PDA (S401).

Thereafter, after loading a compression program (PocketZIP) for compressing the selected file or folder (S402), a folder path for storing the compressed file is selected later (S403). At this time, the folder path to store the compressed file is stored in a separate storage space (S404).

If the folder path in which the compressed file is to be stored is selected, a list of files selected for compression or a list of files stored in a folder is generated (S405). The path of the file selected for compression is the folder path. It is stored in the storage space for storing (S404).

Thereafter, the files listed in the list are sequentially selected one by one to check whether there is an error in the corresponding file (S406). At this time, if no error is found in the selected file, the next file is selected to check the error continuously. The error checking of such a file is repeatedly performed until all the files listed in the file list are selected.

If there is an error in the selected file in the process of checking the errors of the above files, the error is ignored and it is checked whether or not to continue the error checking of the next files or to terminate further operations (S407). At this time, if the user's command to ignore the error and continue the error check of the next file is entered, the error of the next file is checked, and if the command to uncompress is entered, the Windows CE file structure is analyzed ( S408). That is, after canceling the compression, a file list of the My documents folder, which is a default folder, is generated along with a message for confirming the canceling of compression, and then the file list is output on the screen (S409).

On the other hand, if all error checking of the files listed in the file list is completed, the information and compressed information of the selected file is stored in the compressed file to be generated (S410). Thereafter, the selected file path stored in the storage unit is loaded (S411), the data read from the memory is compressed, and then stored in the compressed file (S412).

At this time, the compression of the file is repeatedly performed until all the files listed in the file list are selected.

Through this process, data is compressed. When the data compression is completed, the folder path for storing the compressed file stored in the storage unit is loaded, the Windows CE file structure is analyzed, and the file list of the corresponding folder ( After generating the file list (S413) and outputting the file list to the screen (S414), the compression of data according to the present invention is completed.

5 is a flowchart for describing a method of restoring a compressed file created in a general operating system, which will be described in detail with reference to the accompanying drawings.

As shown in Fig. 5, after selecting a compressed file (zip file) to be restored (S501), a program for restoring the compressed file is loaded (S502).

Thereafter, after reading and analyzing the header information of the compressed file (S503), it is checked whether the file is a Zip file (S504), and if the Zip file is a part of the header information of the file is converted into Unicode (S505). If not, the Windows CE file path is analyzed (S506). That is, if the selected file is not a Zip file, a file list of a My documents folder, which is a default folder, is generated with a message, and then the file list is output on the screen (S507).

On the other hand, if it is found that the selected file is a Zip file, part of the header information is converted to Unicode, and then the file paths in the header information of the Zip file are separated and converted into a general file structure (tree structure) (S508). Listed files are displayed on the screen (S509). In this case, the part converted to Unicode is information about a file name corresponding to a file path of a compressed file header.

Thereafter, the user selects files to be compressed and restored from the displayed file list (S510), and then selects a folder in which the restored file is to be stored (S511). In this case, if the folder in which the file is to be stored is not selected, the file paths in the header information of the front end Zip file are separated and converted to the general file structure.

On the other hand, after selecting the folder where the restored file is to be stored and finally converting the header information of the Zip file to Unicode (S512), restoration of the compressed file is completed (S513).

As described above, in restoring the compressed file created by the general operating system, the compressed file created by the general operating system can be easily restored by the PDA by converting the header information of the Zip file created by the completed code into the Unicode code supported by the PDA. have.

For reference, FIGS. 6A to 6B illustrate a schematic method for compressing and restoring a file written in a specific language according to the present invention. The language may be a major language of the world including Korean.

First, as shown in FIG. 6A, after selecting a file to be compressed, the selected file is opened and a list of selected files is generated (S601). Thereafter, the path of the selected file is converted into a complete code for use in a general operating system (S602), and then a code of a Zip file is input and stored in a header information file (S603).

Thereafter, after storing the path (header information) of the file converted into the complete code in a compressed file (S604), a compressed file is finally generated (S605).

As such, when a file is compressed, a compressed file is generated by converting the compressed file into a complete code for use in a general operating system so that the user can easily manage the compressed file.

6B illustrates a method for restoring a compressed file (zip file). After selecting a compressed file to be restored, the selected compressed file is opened (S611), and the code (header information) of the compressed file is shown. Check whether the compressed file (Zip) file through (S612).

If it is a compressed file, the Zip file header information is read and analyzed, the file path is stored in the storage unit, the path (header information) of the file to be restored is extracted (S613), and the extracted path (header information) is converted into Unicode. The conversion is made (S614).

Thereafter, after the file is generated using the Windows CE file structure (S615), when the compressed file is restored (S616), the process of restoring the compressed file is completed.

In this way, by converting the header information of the Zip file made of the complete code into the Unicode (Uni Code) supported by the Windows CE of the PDA and finally compressed to ensure compatibility between the general operating system and Windows CE.

As described above, the data compression and decompression method of the present invention has the following effects.

In restoring a compressed file in a general operating system, by converting the header information of the compressed file into Unicode that can be supported by Windows CE, efficient use of the compressed file in a PDA running Windows CE is possible. When compressing a file, the header information of the compressed file is converted into a complete code so that it can be used by a general operating system, and then compressed, so that the user can conveniently manage the compression on a PDA by making compatibility with compression and restoration between different operating systems. The effect is that the program can be used.

Claims (7)

In a method of compressing data after selecting a target folder and a folder path to store a compressed file in a PDA having a Windows CE-based operating system, Generating a list of the selected compression target file and checking whether there is an error while designating a path of the compression target file included in the list; If there is an error from the check result, ignoring the error and continuously deciding whether to proceed with compression or cancel the compression by checking an error of the next compression target file; Converting the header information of the error-checked compression target file into a complete code that can be used in a general operating system when the compression progress is determined from the above step; Compressing the data of the completed code and the compression target file to generate a final compressed file; Data compression method characterized by proceeding to. delete delete delete The method of claim 1, wherein after generating the compressed file, And loading the file path to analyze a Windows CE file structure and outputting a file list on the screen. In a method for restoring compressed data in a PDA, Selecting the archive you want to restore, Analyzing header information of the compressed file and checking whether the currently selected file is actually a compressed file; Converting a part of the header information of the file into Unicode if the file is a compressed file; Generating a list of the files and displaying them on a screen; Selecting a file to restore from the files listed in the file list; Converting the remaining information not converted to Unicode among the header information into Unicode; Restoring a file based on the information converted to Unicode. 7. The method of claim 6, further comprising analyzing the Windows CE file structure and displaying the file contents on the screen if the currently selected file is not a compressed file.