JP5150979B2 - Code conversion system, code conversion device, code conversion method, and code conversion program - Google Patents

Description

  The present invention relates to a code conversion system, a code conversion device, a code conversion method, and a code conversion program, and in particular, a code conversion system, a code conversion device, a code conversion method, and a code for converting a Japanese code into Unicode. Concerning conversion program.

Unicode (Unicode), which is an international standard for coded character sets defined by the Unicode Consortium, is defined by UCS-2 (Universal Character Set coded in 2 octets), which is one of the coding schemes. A set of characters represents all characters in 16 bits (2 bytes), and is intended to enable multilingual processing with one character code system.
However, all characters with different character systems (language systems) are expressed by the character codes (16 × 16 × 16 × 16 = 65,536 characters) represented by [0000] to [FFFF (hexadecimal number)]. It is impossible to do. Therefore, in UTF-16 (UCS Transformaion Format for 16 Planes of Group 00), which is another new encoding method in Unicode, a code of 2 characters is paired, that is, 32 bits (4 A surrogate pair character representing one character using a byte) can be used.

  Specifically, the area of [D800] to [DFFF] in the basic character area BMP (Basic Mutilingual Plane) of Unicode is defined as the surrogate pair character area, and the upper 2 bytes indicated by [D800] to [DBFF] It is possible to handle a total of (1, 024 × 1, 024 = 1, 048, 576) characters as surrogate pair characters by 4 bytes of the combination of the code and the lower 2-byte code indicated by [DC00] to [DFFF] It is said. Here, surrogate pair characters are managed over 16 planes, 65,536 characters for each plane indicated by (256 × 256) divisions.

  Furthermore, in recent years, computers that support Japanese language have been adapted to “JIS X 0213: 2004”, which is a JIS standard for coded kanji sets for information exchange corresponding to the print standard fonts established by the Cultural Council National Language Subcommittee. Unicode (Unicode version 3.2 or higher) is starting to be used. Along with this, it is necessary to support conversion between Japanese 2-byte codes of various vendors and Unicode corresponding to “JIS X 0213: 2004”.

  Here, in “JIS X 0213: 2004”, characters are greatly added from “JIS X 0208” and “JIS X 0212”, which are the predecessor JIS standards. Characters that could not be entered (303 characters, etc.) were to be accommodated on the Kanji addition side. At this time, characters accommodated in the Chinese character addition surface are represented by a 4-byte code (surrogate pair) in the UTF-16 encoding format. Therefore, when the character string of “JIS X 0213: 2004” is expressed in the UTF-16 encoding format, it is a case of a 2-byte character code related to the basic multilingual aspect and a case of a 4-byte character code related to the Chinese character addition aspect. Is a mixed format.

In general-purpose code conversion devices so far, only the characters corresponding to “JIS X 0208” have been used, so it is not necessary to use surrogate pairs even when expressed in UTF-16 encoding format. Can be composed of 2 bytes.
For this reason, in the case of code conversion from kanji 2-byte code such as “JIS X 0208” to Unicode, code conversion can be performed if a one-to-one code conversion table is provided from 2 bytes to 2 bytes.

  However, in order for the code conversion device to support Unicode corresponding to “JIS X 0213: 2004” as a conversion destination, in addition to a mechanism for converting from 2 bytes to 2 bytes, a mechanism for converting from 2 bytes to 4 bytes is also required. Become. That is, in a code conversion device that converts a code according to “JIS X 0213: 2004” into a Unicode according to UTF-16, it is necessary to perform both conversion into 2-byte data and conversion into 4-byte data. is there.

Therefore, as a mechanism for realizing this code conversion, it may be assumed that a one-to-one code conversion table is created from a 2-byte code to a 4-byte code in the same way as general-purpose technology.
Specifically, in order to perform conversion into a code in which a 2-byte code and a 4-byte code are mixed, a method in which each element of the code conversion table T1 in FIG. 11 is 4 bytes is common.

  FIG. 11 is a general code conversion table for converting a 2-byte code to a 2-byte code, and is an example in which a conversion-target 2-byte code corresponding to a conversion-source 2-byte code value is stored in an array. FIG. 12 is an example in which each element of the code conversion table T1 of FIG. 11 is 4 bytes.

In the code conversion using the code conversion table T2 shown in FIG. 12, when referring to a table element using a 2-byte code as a key, if the value of the upper 2 bytes is 0000h, the value of the lower 2 bytes is converted into the basic multilingual aspect. The value of the 2-byte code of UTF-16 representing the character of the character, and when the upper 2 bytes are other than 0000h, the value of the surrogate pair (4-byte code of UTF-16) representing the character of the Chinese character addition surface is set to 2 Byte and 4-byte code conversion results can be obtained.
In this case, since information of 4 bytes per character is required, a code conversion table having a size twice that of the general-purpose technology is required.

  On the other hand, an example of a related technology of a system that performs code conversion corresponding to a surrogate pair is described in Patent Literature 1, Patent Literature 2, and the like.

  In the code conversion of Patent Document 1, both the conversion input and the conversion output are Unicode. In Patent Document 1, a surrogate pair (4-byte code) is converted into a 2-byte code and stored in a database. In the code conversion means described in Patent Document 1, the surrogate pair is replaced with a 2-byte private area code, stored in the database, and if there is a private area code when data is extracted from the database, the code reverse conversion procedure is performed. The method of returning to the corresponding surrogate pair by means is shown.

  FIG. 13 is an example of a code conversion table referred to by the code reverse conversion means of Patent Document 1. According to Patent Document 1, in the code reverse conversion means, when the input 2-byte code is a character code in the private area, the code conversion table T3 in FIG. 13 is searched using the character code in the private area as a key, The surrogate pair character code corresponding to the key is obtained.

In Patent Document 2, as disclosed in paragraph numbers [0012] to [0014], the character data input unit cuts out the input character code string by 2 bytes, and the 2-byte code is surrogate. Surrogate pair character detection means for determining whether or not the code is used for specifying a pair character and obtaining a 4-byte code specifying the surrogate pair character is provided.
Further, the character data input unit obtains a 2-byte code associated with the 4-byte code obtained by the surrogate pair character detection means with reference to the conversion table, and obtains a 4-byte code using the 2-byte code. Code replacement means for replacing the code is provided.

  Further, in Patent Document 2, the code replacement means converts a 4-byte code that specifies a surrogate pair character into a 2-byte code that specifies a surrogate pair character prepared in the external character area of the font file in the character processing system in advance. To do. The character data input unit is specified by a combination of a high-order 2 byte code and a low-order 2 byte code included in the surrogate pair character areas [D800] to [DFFF] set by previously dividing the Unicode basic character area BMP. The surrogate pair characters having a high frequency of appearance in the surrogate pair characters, or a plurality of surrogate pair characters defined according to needs, are previously stored in the external character regions [E000] to [F8FF] in the Unicode basic character region BMP. Is registered as an external character (surrogate character) that can be specified by a 2-byte code.

Further, in Patent Document 2, in the character data input unit, a 2-byte code for identifying a plurality of external characters (surrogate characters) registered in the external character area of the font file and a surrogate pair corresponding to the external character (surrogate character) A 4-byte code specifying a character is associated with each other and registered in the conversion table.
For this reason, the conversion table of Patent Document 2 requires 4-byte data for the elements of the table.

JP 2008-242992 A JP 2009-42980 A

  However, in the method shown in FIG. 12 using the related technique as described above, the storage area of the code conversion table is doubled compared to the case of using the code conversion table T1 of FIG. The reason is that one element of the code conversion table T1 of FIG. 11 is 2 bytes, whereas one element of the code conversion table T2 of FIG. 12 is 4 bytes.

By the way, depending on a device that implements code conversion, such as an embedded device, there is a limit on the size of an area that can be allocated to the code conversion table, so a code used for code conversion to Unicode corresponding to “JIS X 0213: 2004”. It is necessary to make the size of the conversion table as small as possible.
For this reason, in the method shown in FIG. 12, the size required to store the conversion table is twice the size of the general-purpose technology, the conversion table storage area becomes enormous, and the embedded device has a relatively small memory capacity. For example, the conversion table cannot be mounted on a device that implements code conversion.

In “JIS X 0213: 2004”, there are 303 kanji characters stored in the kanji addition surface (second surface), and there are about 303 patterns to convert from 2-byte kanji code to 4-byte unicode. .
For this reason, when there are 8836 elements (94 × 94) as in the code conversion table T2 shown in FIG. 12, about 4% of the characters need to be converted into a 4-byte code. When the code conversion to 303 is 303 characters, the upper 2 bytes are unnecessary information in the remaining 96% of the elements, and there is a disadvantage that it is wasteful.

Further, the mechanism shown in FIG. 13 of Patent Document 1 of the related art is used as a means for converting a kanji 2-byte code to a surrogate pair (UTF-16 4-byte code), and from a kanji 2-byte code to UTF-16 2. The conversion to the byte code has the following disadvantages when the code conversion is performed using the code conversion table T1 of FIG.
That is, when using the code conversion table T3 in FIG. 13, the code range of the conversion source is limited to the private area range (E000h to F8FFh) of Unicode (Unicode), so it is used with a Kanji 2-byte code. The code range (2121h to 7E7Eh) or the like is not subject to conversion.
Therefore, in order to enable conversion from a Kanji 2-byte code to a surrogate pair using the code conversion table T3 of FIG. 13, the key value in the code conversion table T3 of FIG. The entire range of codes needed to be.

Furthermore, as shown in FIG. 14, it can be assumed that the sequence of private area character codes in the code conversion table T3 of Patent Document 1 in FIG. 13 is replaced with a Kanji 2-byte code.
When the code conversion table T4 of FIG. 14 is used to convert to a surrogate pair corresponding to a Kanji 2-byte code, there is the following inconvenience.

That is, when the code conversion table T4 of FIG. 14 is used, the code conversion table T4 of FIG. 13 must be searched every time one character is converted. This is because the conditions for searching the code conversion table T4 in FIG. 14 cannot be limited.
Here, the kanji 2-byte code is not limited to the JIS code, but targets a kanji code that can be expressed in 2 bytes, such as a vendor-specific kanji code. For this reason, if the conversion source kanji 2-byte code that can be converted to a surrogate pair is the entire range of the kanji 2-byte code, it is a kanji 2-byte code that should be converted to a surrogate pair for each character conversion. It is necessary to search the code conversion table T4 shown in FIG. 14 to determine whether it takes a long time.

Thus, even if the code conversion table of Patent Document 1 is applied, when code conversion from 2 bytes to 4 bytes is performed as compared with code conversion from 2 bytes to 2 bytes, in code conversion, There was a disadvantage that the processing speed was slow.
Further, in the above-mentioned Patent Document 1, 4-byte data is required for the elements of the conversion table, the table size and the storage area of the table become enormous, and the above-mentioned device such as an embedded device having a relatively small memory capacity implements the above-mentioned code conversion. There was an inconvenience that a conversion table could not be installed.

  In addition, in Patent Document 2, 4-byte data is required for the elements of the conversion table, the table size and the storage area of the table become enormous, and a device that implements code conversion such as an embedded device having a relatively small memory capacity. Has the disadvantage that the conversion table cannot be mounted.

(Object of invention)
An object of the present invention is to solve the inconveniences of the related art described above, and at the time of code conversion, the conversion table can be mounted on a device that implements code conversion such as an embedded device by minimizing the storage area of the conversion table. However, an object of the present invention is to provide a code conversion system, a code conversion device, a code conversion method, and a code conversion program that can shorten the processing time required for code conversion.

  In order to achieve the above object, a code conversion system according to the present invention includes an input device that inputs a first code corresponding to a first information amount of the number of bytes allocated in advance to one character information, The first code is a code system different from the first code with reference to a code conversion table provided in advance, and the second code corresponding to the first information amount with respect to the character information or the number of bytes greater than this. A code conversion device for converting into a second code corresponding to two information amounts, a first code of the first information amount, and a second code of the first information amount provided for the code conversion device for the code conversion device; Are associated with each other, and a third multilingual plane conversion table having the first information amount value as an element, a part of the first information amount value, and a third information comprising a smaller number of bytes than the second information amount. A storage device associated with an amount of the first intermediate code and having an additional surface conversion table having the value of the third information amount as an element, and the first information amount converted by the code conversion device, or An output device that outputs the second code of the second information amount.

  The above-described code conversion device refers to the basic multilingual surface conversion table, and refers to the additional surface conversion table when the first information amount is a partial range of the value of the first information amount. Then, the first intermediate code of the third information amount is output, and a predetermined calculation process is performed on the first intermediate code of the third information amount to perform the second information amount of the second information amount. A second code generation / output function for generating and outputting a code is provided.

  In order to achieve the above object, a code conversion apparatus according to the present invention inputs a first code having a first information amount assigned in advance to one character information, and uses the first code as a basic multilingual surface conversion table and By referring to one or both of the additional surface conversion tables, there is a case where the code information is different from the first code and the character information has the first information amount or a second information amount larger than this. The basic multilingual plane conversion table described above includes a first code of the first information amount and a second code of the first information amount. The additional surface conversion table includes a data structure associated with the value of the first information amount as an element, and the additional surface conversion table includes a part of the element and a first intermediate code having a third information amount smaller than the second information amount. Is associated And a data structure whose elements are the values of the third information amount.

  As a result of referring to the basic multilingual surface conversion table, when the first code is a partial range of the element, the additional surface conversion table is referred to and the first code corresponds to the first code. A function of outputting the first intermediate code of the third information amount and a predetermined arithmetic processing on the first intermediate code of the third information amount to generate the second code of the second information amount And an output function.

In order to achieve the above object, the code conversion method of the present invention converts the first code when the first code corresponding to the first information amount of the number of bytes allocated in advance to one character information is input. , Referring to a code conversion table provided in advance, a second code amount corresponding to the first information amount with respect to the character information or a second information amount having a larger number of bytes than the first code. A code conversion device for converting to a second code, and a code conversion device for the code conversion device, the first code of the first information amount and the second code of the first information amount are associated with each other. And a basic multilingual plane conversion table having the value of the first information amount as an element, and a first intermediate of a third information amount comprising a part of the value of the first information amount and a smaller number of bytes than the second information amount Co There the values of de and is associated and the third amount of information code conversion system with additional surface conversion table whose elements,
By referring to one or both of the basic multilingual surface conversion table and the additional surface conversion table for the input first code, the first code is a code system different from the first code, and the character information is the first code. The code conversion device converts the information into a second code that may have a case of one information amount or a case of a second information amount larger than this, and then, the converted first information amount or the second information amount The second code is output externally,
In the conversion by the code conversion device, first, the basic multilingual surface conversion table is referred to, and when the reference result is a partial range of the element, the additional surface conversion table is then referred to Outputting the first intermediate code of the third information amount, and performing a predetermined calculation process on the first intermediate code of the third information amount to generate the second code of the second information amount. Features.

In order to achieve the above object, the code conversion program according to the present invention receives the first code when the first code corresponding to the first information amount of the number of bytes allocated in advance for one character information is input. A code conversion device that converts a second code having a code system different from the first code with reference to a code conversion table provided in advance, and the code conversion device for the code conversion device; A basic multilingual plane conversion table in which the first code of the amount and the second code of the first information amount are associated with each other, and one of the values of the first information amount Conversion system comprising an additional surface conversion table in which a first intermediate code of a third information amount having a number of bytes smaller than the second information amount is associated with the value and the value of the third information amount In the,
The input first code of the first information amount is different from the first code with reference to one or both of the basic multilingual plane conversion table and the additional plane conversion table, and the character information A code conversion function for converting into a second code when the number of bytes is the first information amount or a second information amount larger than the first information amount, and the converted first information amount or the second information amount Has an output processing function that outputs two codes,
In the code conversion processing function, when the conversion process of the first code is performed, the basic multilingual surface conversion table is referred to, and when the reference result is in a partial range of the element, the additional surface conversion table is referred to. A first intermediate code output processing function for performing the conversion processing and outputting the first intermediate code of the third information amount, and applying the predetermined arithmetic processing to the output first intermediate code to perform the second processing A second code generation processing function for generating and outputting the second code of the amount of information,
Each of these processing functions is executed by a computer provided in the code conversion apparatus.

  According to the present invention, the additional surface conversion table is configured with the third information amount smaller than the second information amount as an element, and in the code conversion for generating the second code of the second information amount, the additional surface conversion table is more than the additional surface conversion table. Since the first intermediate code of three information amounts is taken out and subjected to a predetermined calculation process to generate the second code of the second information amount, the second information amount of the second information amount as in the related art described above is generated. There is no need to configure a conversion table, and when converting code, the conversion table can be installed in a device that implements code conversion, such as an embedded device, by minimizing the storage area of the conversion table. An excellent code conversion system, code conversion device, code conversion method, and code that are not available in related technologies, which can be shortened and can speed up conversion processing. It is possible to provide a conversion program.

It is a block diagram which shows an example of the whole structure of the code conversion system by 1st Embodiment of this invention. It is explanatory drawing which shows an example of the data structure of the basic multilingual surface conversion table in the code conversion system of embodiment disclosed in FIG. It is explanatory drawing which shows an example of the data structure of the additional surface conversion table in the code conversion system shown in FIG. It is a flowchart which shows an example of the operation | movement in the code conversion system of embodiment disclosed in FIG. It is a flowchart which shows the whole operation | movement in the code conversion system of embodiment disclosed in FIG. It is a block diagram which shows an example of the whole structure of the code conversion system in 2nd Embodiment of this invention. It is a flowchart which shows an example of the operation | movement in the code conversion system of 2nd Embodiment disclosed in FIG. It is a block diagram which shows an example of the whole structure of the code conversion system in 3rd Embodiment of this invention. It is explanatory drawing which shows an example of the data structure of the additional surface N conversion table in the code conversion system of 3rd Embodiment disclosed in FIG. It is a flowchart which shows an example of the operation | movement in the code conversion system of 3rd Embodiment disclosed in FIG. It is explanatory drawing which shows an example of the data structure of the code conversion table in related technology. It is explanatory drawing which shows an example of the other data structure of the code conversion table in related technology. It is explanatory drawing which shows an example of the other data structure of the code conversion table in related technology. It is explanatory drawing which shows an example of the data structure of the code conversion table (modified example) in related technology.

Hereinafter, a code conversion system according to a first embodiment of the present invention will be described with reference to FIGS.
The code conversion system 1 according to the first embodiment performs high-speed code conversion with a minimum necessary memory capacity when performing conversion from kanji 2-byte code to Unicode (mixed of Unicode / 2 bytes and 4 bytes). It has the intended configuration.

  In order to realize this, the first embodiment includes a basic multilingual plane conversion unit 21 and an additional plane conversion unit 22 when converting a kanji 2-byte code into Unicode. Corresponding to the conversion unit, a basic multilingual plane conversion table storage unit 31 and an additional plane conversion table storage unit 32 are provided respectively.

  The basic multilingual plane conversion table storage unit 31 stores in advance Unicode (2-byte code in UTF-16 encoding format) corresponding to the Kanji 2-byte code. In the basic multilingual surface conversion table storage unit 31, when converting a character whose conversion destination is Unicode (2-byte code) of the kanji adding surface, a code range used in a surrogate pair to which no character is assigned. A 2-byte value (D800h to DFFFh) is assigned and held.

  The additional plane conversion unit 22 is used only when the basic multilingual plane conversion unit 21 acquires the values D800h to DFFFh. The additional surface conversion unit 22 refers to the additional surface conversion table storage unit 32 during the conversion operation. Here, the additional plane conversion table storage unit 32 is configured with 2 bytes for each code of D800h to DFFFh, and can be directly referred to by the values of D800h to DFFFh.

Then, from the 2 bytes obtained from the additional plane conversion unit 22, the Unicode plane section generation unit 112 and the Unicode UTF-16 encoding unit 113 convert and output Unicode (4 bytes) of the Chinese character additional plane.
This will be specifically described below.

[First Embodiment]
First, the basic configuration of the code conversion system in this embodiment will be described.
As shown in FIG. 1, the code conversion system 1 according to the first embodiment includes an input device 10 that inputs a first code having a first information amount of the number of bytes allocated to one piece of character information in advance. ing.

  The code conversion system 1 is different from the first code by referring to one or both of the basic multilingual surface conversion table 31a and the additional surface conversion table 32a with respect to the first code input by the input device 10. A code conversion device 20A is provided that converts the character information into a second code that may have a case of the first information amount or a case of a second information amount larger than the character information.

Furthermore, the code conversion system 1 includes a storage device 30. The storage device 30 includes a basic multilingual plane conversion table 31a in which the first code of the first information amount and the second code of the first information amount are associated with each other and the value of the first information amount is an element. Is provided with a basic multilingual surface conversion table storage unit 31. Further, the storage device 30 associates a part of the element with a first intermediate code having a third information amount smaller than the second information amount, and performs additional surface conversion using the value of the third information amount as an element. An additional surface conversion table storage unit 32 equipped with a table 32a is provided.
The code conversion system 1 further includes an output device 40 that outputs the second code of the first information amount or the second information amount converted by the code conversion device 20A.

  When the result of referring to the basic multilingual surface conversion table 31a is a partial range of the element, the code conversion device 20A then refers to the additional surface conversion table 32a and then adds the first information of the third information amount. In addition to outputting the intermediate code, the first intermediate code having the third information amount is subjected to a predetermined arithmetic process to generate a second code having the second information amount and outputting the second code.

  According to such a basic configuration of the code conversion system 1, the additional surface conversion table 32a is configured with the third information amount smaller than the second information amount as an element, and generates the second code of the second information amount. In the code conversion, in order to generate the second code of the second information amount by outputting the first intermediate code of the third information amount with reference to the additional surface conversion table 32a and performing a predetermined arithmetic process on the first intermediate code. There is no need to construct a conversion table for the second information amount as in the related art, and it is possible to mount a conversion table in a device that implements code conversion, such as an embedded device, by minimizing the storage area of the conversion table when performing code conversion. However, the processing time for code conversion can be shortened, and the conversion process can be speeded up.

(Overall configuration of code conversion system)
Next, the specific configuration of the code conversion system according to the first embodiment will be described from the overall configuration, and then the detailed configuration of each unit will be described with reference to FIG.
FIG. 1 is a block diagram showing the entire code conversion system in the first embodiment.

  As shown in FIG. 1, the code conversion system 1 according to the first embodiment includes an input device 10 such as a keyboard, a code conversion device 20A that operates by program control, and a memory that stores information indicating the correspondence of code conversion. A device 30 and an output device 40 such as a display device or a printing device are provided.

  The storage device 30 includes a basic multilingual surface conversion table storage unit 31 that stores the basic multilingual surface conversion table 31a illustrated in FIG. 2, and an additional surface conversion table storage unit 32 that stores the additional surface conversion table 32a illustrated in FIG. It has.

(Basic multilingual plane conversion table data structure)
As shown in FIG. 2, the basic multilingual plane conversion table 31a is an example of a kanji 2-byte code, which is a conversion source kanji 2-byte code having an upper 1 byte in the range of 21h to 7Eh and a lower 1 byte of 21h to 7Eh. Is a matrix table corresponding to the data structure in which Unicode (UTF-16) of the conversion destination is stored in each element.

Here, when the conversion destination Unicode corresponding to the conversion source is the character of the additional plane, the values of D800h to DFFFh are stored.
The values of D800h to DFFFh in the basic multilingual surface conversion table 31a are values that uniquely determine the character of the additional surface, and are not handled as the values of the conversion destination UTF-16, and the additional surface conversion unit 22 stores the additional surface conversion table. The key is used as a key for referring to the part 32.
Furthermore, when mounted on the storage device 30, the structure is such that 2 bytes as the elements of the table are continuously stored in ascending order of the conversion source 2-byte code.

  The basic multilingual plane conversion table storage unit 31 referred to by the basic multilingual plane conversion unit 21 for conversion from the kanji 2-byte code to the Unicode is Unicode corresponding to the kanji 2-byte code (2-byte code in the UTF-16 encoding format). ) Is stored in advance. In the basic multilingual plane conversion table storage unit 31, a code range used in a surrogate pair to which no character is assigned for character conversion in which the conversion destination is Unicode (4-byte code) of the Chinese character addition plane. D800h to DFFFh) are allocated and stored.

  Here, in the basic multilingual plane conversion table 31a, the first code (2121h, etc.) of the first number of bytes (2 bytes, etc.) is associated with the second code (3000h, etc.) of the first number of bytes. A second code (D800h to DFFFh, etc .: first area) within a specific range in which the second code of the first byte is within a predetermined range and a specific range outside the range A data structure including an outer first byte number second code (other than D800h to DFFFh: second area) is provided.

  More specifically, the basic multilingual plane conversion table 31a converts the first code into the second code having the first number of bytes, in order to convert the first code of the first number of bytes (such as 2 bytes). Decomposition of code into at least two upper bytes and lower bytes First code decomposition upper byte number (upper 1 byte, etc.) 1 decomposition first code (74h, etc.) and first code decomposition lower byte number (lower 1 byte) Etc.) and a data structure in which the second code (E001h, etc.) corresponding to the first number of bytes (2 bytes, etc.) is associated with the other decomposed first code (22h, etc.).

  That is, the basic multilingual plane conversion table 31a includes a first code (eg, 2121h) of the first information amount (eg, 2 bytes which is an example of the number of first bytes) and a second code (3000h) of the first information amount. Etc.) and a data structure having the value of the first information amount as an element.

(Data structure of additional surface conversion table)
As shown in FIG. 3, the additional plane conversion table 32a is a matrix table corresponding to 2 bytes having a range of upper 8 bytes from D8h to DFh and lower 1 byte from 00h to FFh. Stores Unicode block information (lower 2 bytes of UTF-32). Here, the Chinese character addition surface in Unicode is fixed to the second surface, and information on the additional surface (the upper 2 bytes of UTF-32) is omitted.

  This additional plane conversion table 32a is within a predetermined range within the second code group ([3000h], etc.) of the first information amount (the first byte count, etc.) in the basic multilingual plane conversion table 31a. A certain range code (such as D800h to DFFFh) (a first information amount) and a third information amount smaller than the second information amount (in the first embodiment, third information amount = first information amount = first The data structure is associated with the first intermediate code (000 Bh or the like) of 2 bytes, which is the number of bytes). That is, the additional surface conversion table 32a is configured with an information amount in which the third information amount is the same as the first information amount.

  More specifically, the additional plane conversion table 32a has a first byte number of a specific range in which the second code (eg, 3000h) of the first byte number in the basic multilingual plane conversion table 31a described above falls within a predetermined range. Two codes (D800h to DFFFh, etc.) are decomposed into at least two high-order bytes and low-order bytes. 2 code decomposition lower byte number (lower 1 byte etc.) other decomposition specific range second code (01h etc.) and conversion destination (first byte number) first intermediate code (0088h etc.) Data structure.

  Here, the additional plane conversion table 32a includes a part of the elements (D800h to DFFFh, etc.) in the basic multilingual plane conversion table 31a described above and a first intermediate code having a third information amount smaller than the second information amount ( 000Bh) and the like, and a data structure having the value of the third information amount as an element.

  The additional surface conversion table 32a is an image in which the 2-byte values that are the elements of the table are continuously stored in ascending order of the conversion-source 2-byte values in terms of mounting in the storage device 30. In addition, when the number of characters corresponding to the Chinese character addition surface is small, the number of elements can be reduced as necessary.

(Specific configuration of code converter)
As shown in FIG. 1, the code conversion device 20A performs conversion from a kanji 2-byte code, which is an example of a first code, to a Unicode (a mixture of 2-byte code and 4-byte code), which is an example of a second code. Code conversion is performed at a high speed with a minimum necessary memory capacity, and a basic multilingual plane conversion unit 21, an additional plane conversion unit 22, a Unicode plane segment generation unit 23, and a Unicode UTF-16 encoding unit 24. And.

That is, the code conversion device 20A outputs the Unicode (4 bytes) of the Chinese character additional plane from the 2 bytes obtained from the additional plane conversion unit 22 by the Unicode plane segment generation unit 23 and the Unicode UTF-16 encoding unit 24. It has a function to do.
In other words, the code conversion device 20A inputs a first code of a first information amount (2 bytes that is an example of the first number of bytes) assigned in advance to one piece of character information. By referring to one or both of the basic multilingual plane conversion table 31a and the additional plane conversion table 32a, the code system is different from the first code, and the character information has the first information amount or more. It has a function of converting to a second code that may contain a large amount of second information (4 bytes, which is an example of the number of second bytes), and outputting this.

  Here, the basic multilingual plane conversion unit 21 has a function of acquiring a value stored in the basic multilingual plane conversion table storage unit 31 using a 2-byte value given from the input device 10 as a key. .

The additional surface conversion unit 22 has a function of acquiring a value (first intermediate code) stored in the additional surface conversion table storage unit 32 using the values of D800h to DFFFh as keys. The additional surface conversion unit 22 refers to the additional surface conversion table storage unit 32 at the time of code conversion.
Further, the additional plane conversion unit 22 is used only when the basic multilingual plane conversion unit 21 acquires the values of D800h to DFFFh. The additional surface conversion table storage unit 32 is configured with 2 bytes for each code of D800h to DFFFh, and can be directly referred to by the values of D800h to DFFFh.

The Unicode plane segment generation unit 23 sets the value (first intermediate code) referenced by the additional plane conversion unit 22 as the lower 2 bytes in UTF-32, and adds a fixed value indicating the Chinese character additional plane to the upper 2 bytes. It has the function of 2 intermediate codes.
Further, the Unicode UTF-16 encoding unit 24 converts the value of UTF-32 (second intermediate code) generated by the Unicode plane segment generation unit 23 into the value of the surrogate pair (4 bytes) of UTF-16 (second byte). Code).

  Furthermore, the basic multilingual surface conversion unit 21 described above determines whether or not the second code of the first information amount obtained by referring to the basic multilingual surface conversion table 31a is within the range and is out of the range. And a function of converting the first code into the second code having the first information amount and outputting the second code.

  The additional plane conversion unit 22 operates when the basic multilingual plane conversion unit 21 determines that the range is within the range, and refers to the additional plane conversion table 32a to convert the specific range code into the third range code. A function of converting the information amount into a first intermediate code is provided.

Here, the post-conversion processing means 29a is configured by the Unicode plane segment generation unit 23 and the Unicode UTF-16 encoding unit 24.
The post-conversion processing means 29a has a function of performing a predetermined calculation process on the first intermediate code of the third information amount to generate the second code of the second information amount and outputting it. Yes.

Further, the additional surface conversion unit 22 has a function of converting the specific range code into the first intermediate code of the first information amount with reference to the additional surface conversion table 32a.
In this case, the Unicode plane segment generation unit 23 performs a predetermined arithmetic process on the first intermediate code of the first information amount obtained by the additional plane conversion unit 22 to perform the second information amount. The second intermediate code is generated.

  The Unicode UTF-16 encoding unit 24 as a first encoding function of the encoding unit encodes the second intermediate code of the second information amount generated by the Unicode plane segment generation unit 23. The encoding process is performed in the first encoding format in which the conversion result becomes the second information amount, and thereby has the function of outputting the above-described second code.

  Further, the additional surface conversion unit 22 stores the elements of the additional surface conversion table 32a from the value of one decomposition specific range second code of the upper byte and the value of the other decomposition specific range second code of the lower byte. A function for calculating the position of the first intermediate code and calculating the value of the first intermediate code described above.

  Further, the Unicode plane segment generation unit 23 uses the first intermediate code obtained by the additional plane conversion unit 22 as a lower byte, sets a predetermined first fixed value as an upper byte, and sets this as the lower byte. It has a function to add.

Here, when the first code is a Kanji code and the second code is a Unicode of the first encoding format, the first fixed value described above is a third different from the first encoding format. It is a value which shows the kanji addition surface of the Unicode of the encoding format of.
Further, the first encoding format is UTF (Universal multi octet coded characterset Transformation Format) -16, and the third encoding format is UTF-32.

(About operation procedure)
(Overall operation)
Next, the overall operation of the code conversion system will be described with reference to FIGS.

  In the code conversion system 1 according to the present embodiment, as shown in FIG. 1, the first code of the first information amount assigned to one character information and the second code of the first information amount correspond to each other. The basic multilingual plane conversion table 31a having the value of the first information amount as an element, a part of the element, and the first intermediate code of the third information amount having a smaller number of bytes than the second information amount The storage device 30 is preliminarily provided with an additional surface conversion table 32a that is associated with the value of the third information amount.

  In the code conversion operation of the code conversion system 1, first, the input device 10 inputs the first code of the first information amount (FIG. 4 / step S101; input processing step, input processing function).

  Subsequently, the input first code has a code system different from the first code by referring to one or both of the basic multilingual plane conversion table 31a and the additional plane conversion table 32a. The code conversion apparatus 20A performs code conversion to the second code that may have the first information amount or the second information amount having a larger number of bytes (FIG. 4 / step S102; code conversion step, code conversion). function).

  Thereafter, the output device 40 outputs the converted second code of the first information amount or the second information amount (FIG. 4 / step S103; output processing step, output processing function).

  Here, when performing the conversion, if the result of referring to the basic multilingual surface conversion table 31a described above is a partial range of the element, then the additional surface conversion table 32a is referred to A first intermediate code of 3 information amounts is output, and a predetermined calculation process is performed on the first intermediate code of the third information amount to generate a second code of the second information amount. Output (FIG. 5 / steps S111 to S115).

  Furthermore, in the operation procedure in this code conversion, the additional plane conversion table 32a includes a specific range code within a predetermined range in the second code group of the first information amount in the basic multilingual plane conversion table 31a. When the data structure is associated with the first intermediate code of the third information amount having a smaller number of bytes than the second information amount, the basic multilingual plane conversion table 31a is first referred to for the code conversion. It is determined whether or not the second code of the first information amount obtained within the range is within the range, and when it is determined to be out of the range, the first code is used as the second code of the first information amount. The multilingual plane conversion unit 21 performs the first conversion process and outputs the result (FIG. 5 / steps S111 to S112; first conversion process step, first conversion function).

  Subsequently, when it is determined in the first conversion process that the value is within the range, the additional surface conversion unit 22 refers to the additional surface conversion table 32a and converts the specific range code into the first information amount of the third information amount. A second conversion process step of converting to an intermediate code is executed (FIG. 5 / step S113; second conversion process step, second conversion function).

  Thereafter, a post-conversion process in which a predetermined arithmetic process is performed on the first intermediate code of the third information amount, and the post-conversion processing means 29a generates and outputs the second code of the second information amount. The process is executed (FIG. 5 / Steps S114 to S115; post-conversion processing step, post-conversion processing function).

  Further, in the operation procedure in the code conversion, when the second conversion process is executed, the additional surface conversion is performed when the third information amount in the additional surface conversion table 32a is the same as the first information amount. The specific range code is converted into the first intermediate code of the first information amount with reference to the table 32a.

  In executing the post-conversion processing step, first, a predetermined calculation process is performed on the first intermediate code of the first information amount obtained in the second conversion process, and the second conversion process is performed. The post-conversion processing means 29a executes the first generation processing for generating the second intermediate code of the information amount (FIG. 5 / step S114; first generation processing step, first generation function).

  Subsequently, an encoding process is performed on the second intermediate code of the second information amount generated in the first generation process in a preset encoding format, and the second code is output. Processing is executed by the post-conversion processing means 29a (FIG. 5 / step S115; encoding processing step, first encoding function which is an encoding processing function).

  Furthermore, in the operation procedure in this code conversion, when the encoding process is executed, the encoding result is the second intermediate code of the second information amount generated in the first generation process. The post-conversion processing means 29a executes a first encoding process in which the encoding process is performed in the first encoding format that is the amount of information and the second code is output.

(Detailed operation)
Hereinafter, this operation procedure will be described in more detail.
First, the Kanji character string given from the input device 10 is divided into values of every 2 bytes and supplied to the basic multilingual plane conversion unit 21.
The basic multilingual plane conversion unit 21 decomposes the supplied 2 bytes into upper 1 byte and lower 1 byte, and the element (2 of conversion source) in the basic multilingual plane conversion table storage unit 31 from the values of the upper byte and lower byte. After calculating the position where the conversion destination UTF-16 value corresponding to the bytecode is stored, the element is acquired (FIG. 5 / step S111; first byte second code acquisition step, first byte second). Code acquisition function).

Next, it is examined whether or not the value acquired by the basic multilingual surface conversion unit 21 is in the range of D800h to DFFFh (FIG. 5 / step S112; range determination step, range determination function).
If the value acquired by the basic multilingual plane conversion unit 21 in step S112 of FIG. 5 is outside the range of D800h to DFFFh, the conversion is completed because this value is a conversion result of Unicode (UTF-16). To do.

On the other hand, when the value acquired by the basic multilingual surface conversion unit 21 is within the range of D800h to DFFFh, this value is supplied to the additional surface conversion unit 22.
Subsequently, the additional plane conversion unit 22 decomposes the supplied 2 bytes into an upper 1 byte and a lower 1 byte, and an element (2 bytes of the conversion source) in the additional plane conversion table storage unit 32 from the values of the upper byte and the lower byte. After calculating the position storing the lower-order 2 bytes of UTF-32 of the conversion destination corresponding to the element, the element is acquired (FIG. 5 / step S113: first intermediate code acquisition step, first intermediate code acquisition) function).

Further, the value acquired by the additional plane conversion unit 21 is supplied to the Unicode plane segment generation unit 23.
Next, the Unicode plane segment generation unit 23 sets the supplied 2 bytes as the lower 2 bytes in UTF-32, and adds 0002h (fixed value) indicating the Chinese character addition plane to the upper 2 bytes to add the Unicode (Unicode). ) Is generated (UTF-32 encoding format) (FIG. 5 / step S114: second intermediate code generation step, second intermediate code generation function).

Thereafter, the value generated by the Unicode plane segment generation unit 23 is supplied to the Unicode UTF-16 encoding unit 24.
The Unicode UTF-16 encoding unit 24 encodes the 4 bytes of the surrogate pair of UTF-16 based on the 4 bytes of the supplied UTF-32 (FIG. 5 / step S115; second byte second code generation step). , Second byte second code generation function).
Thereby, since the encoding result by the Unicode UTF-16 encoding unit 24 is the conversion result, the conversion is completed.

  In this way, the additional plane conversion unit 22 operates only when the conversion destination is Unicode (Unicode / 4 bytes) of the Chinese character additional plane, so that the execution cost can be suppressed. Further, since the additional surface conversion unit 22 obtains the conversion destination value by referring to the additional surface conversion table storage unit 32, the execution cost of the additional surface conversion unit 22 can be reduced.

  Here, the table size of the basic multilingual plane conversion table storage unit 31 is generally the same as the size of the code conversion table T1 of FIG. 10 of the related art used in code conversion from 2-byte code to 2-byte code. Furthermore, the table size of the additional surface conversion table storage unit 32 is the number of Chinese characters for the additional surface of Chinese characters × 2 bytes, and an increase in the storage usage capacity of the storage device 30 can be suppressed.

Next, effects of the first embodiment will be described in detail.
The first effect is that the size of the code conversion table for converting kanji 2-byte code to Unicode (mixed of 2-byte code and 4-byte code) is approximately 50% compared to the case where a general code conversion table is used. It can be reduced to some extent.

The reason is that when a general code conversion table is used, one element corresponding to one Kanji character of the conversion source is 4 bytes, whereas the code conversion table of the first embodiment has one element. This is for 2 bytes.
That is, in the first embodiment, the table structure in the basic multilingual plane conversion table storage unit 31 is configured by a continuous 2-byte element as in the related art shown in FIG. For this reason, the table size (that is, the storage capacity) of the basic multilingual plane conversion table storage unit 31 is compared with the case where the basic multilingual plane conversion table storage unit 31 is configured by a continuous 4-byte element as shown in FIG. ) Can be halved.

  Specifically, the size of the code conversion table that is additionally prepared for conversion to the kanji stored in the additional surface of Unicode is only the size of the number of kanji stored in the additional surface × 2 bytes. It is.

For example, there are 17369 (94 × 94 × 2) kanji 2-byte codes to be converted, of which 303 characters are converted to Unicode (Unicode) for adding kanji characters, and other characters are converted to basic multilingual characters. When converting to Unicode, 17369 × 4 = 69476 bytes are required if a general code conversion table is used.
On the other hand, when the code conversion table of the first embodiment is used, it is 17369 × 2 + 303 × 2 = 35344 bytes. When the code conversion table of the present invention is used, a general code conversion table is used. About 50% of the size.

  The second effect is that, when code conversion is performed to a basic multilingual character code, code conversion can be performed from a kanji 2-byte code at a speed equivalent to a Unicode (Unicode / 2-byte fixed length) code conversion.

The reason is that the conversion process to the Chinese character addition surface is performed only when conversion to the Unicode (Unicode) of the Chinese character addition surface is necessary.
There is also a technique for reducing the table size by separating the code conversion table of the basic multilingual side and the code conversion table of the additional side in the code conversion of the related technology, but in this case, for each character conversion, the conversion source The basic multilingual plane is used to check the code conversion table for the kanji addition plane, whether the character code is not the target for code conversion for the additional kanji plane, and the basic multilingual plane table after referring to the code conversion table for the kanji addition plane. Even code conversion to, the speed of code conversion slows down.

That is, in the first embodiment, the additional plane conversion unit 22, the Unicode plane segment generation unit 23, and the Unicode UTF-16 encoding unit 24 for converting into the character code of the Chinese character additional plane are the character codes of the additional plane. Operates only when transcoding to (4 bytes).
Since the basic multilingual plane conversion unit 21 can also adopt the same conversion function as that of the related technology, the conversion to UTF-16 (2 bytes) of the related technology can be performed at the same speed as the related technology. it can.

The third effect is that code conversion can be performed at high speed even when code conversion is performed to the character code of the Chinese character addition surface.
The reason for this is that, when code conversion is performed to the character code of the additional surface of the Kanji character, the reference of the basic multilingual surface conversion table 31a is performed once, the reference of the additional surface conversion table 32a is performed once, and the section point generation processing is performed once. This is because a conversion result can be obtained by a single Unicode encoding process.

Here, the section point generation process and the Unicode encoding process can be realized by simple processes. In the code conversion in the case of the related art, the search process of the additional surface conversion table using the conversion source kanji 2-byte code as a key occurs, so that the code conversion speed decreases.
As described above, in the first embodiment, the additional surface conversion unit 22 does not search the additional surface conversion table storage unit 32 but uses the same method as the basic multilingual surface conversion unit 21 to add the additional surface conversion table storage unit. A value is acquired with reference to 32. Therefore, the conversion result can be acquired at a higher speed than when the additional surface conversion table storage unit 32 is searched based on the search key.

  In the first embodiment, the element to be recorded in the additional plane conversion table storage unit 32 may be 2 bytes for converting one additional plane character. For this reason, the table size (storage capacity) of the additional surface conversion table storage unit 32 can be set to 1/3 of the code conversion table T4 shown in FIG. 13 (related technology).

  As described above, the additional surface conversion table 32a is configured with the third information amount smaller than the second information amount as an element, and the code conversion for generating the second code of the second information amount includes the additional surface conversion table 32a. In order to generate a second code of the second information amount by outputting a first intermediate code of the third information amount and performing a predetermined calculation process on the first intermediate code, the second information amount of the related information There is no need to configure a conversion table, and when converting Japanese codes corresponding to “JIS X 0213: 2004” to Unicode having an extended surrogate pair function, the storage area of the conversion table is minimized and relatively small While it is possible to install conversion tables on devices that implement code conversion, such as embedded devices with memory capacity, it is possible to shorten the processing time required for code conversion. It is possible to speed up the process.

  Further, when converting from a kanji 2-byte code to a unicode, the basic multilingual plane conversion table storage unit 31 referred to by the basic multilingual plane conversion unit 21 uses a Unicode (UTF-16 encoding format) corresponding to the kanji 2-byte code. 2 byte code) is stored in advance. In the basic multilingual plane conversion table storage unit 31, in the conversion of the character whose conversion destination is the Unicode (4-byte code) of the Chinese character addition plane, the code range (D800h) used in the surrogate pair to which no character is assigned. ... DFFFh) is allocated and stored.

  Further, the additional plane conversion unit 22 is used only when the basic multilingual plane conversion unit 21 acquires a value of (D800h to DFFFh). In this case, the additional surface conversion unit 22 refers to the additional surface conversion table storage unit 31, and the additional surface conversion table storage unit 31 is configured with 2 bytes for each code of (D800h to DFFFh), and (D800h to DFFFh). Directly referable by value, and from the 2 bytes obtained from the additional plane conversion unit 22, the Unicode plane division generation unit 23 and the Unicode UTF-16 encoding unit 24 output the Unicode (Unicode / 4 bytes) of the Chinese character addition plane. To do.

  Thereby, the code range (D800h to DFFFh) of the surrogate pair of the basic multilingual plane of Unicode can be used as a value indicating the additional plane conversion table 32a, and the additional plane conversion table 32a is configured by 2 bytes, It is possible to reliably suppress an increase in memory used for conversion from 2-byte code to Unicode (Unicode / JIS X 0213: 2004). In addition, by referring to the additional surface conversion table 32a without searching, it is possible to perform high-speed code conversion even when converting to the Unicode (Unicode) of the Chinese character additional surface.

  The above description has been made on the assumption that each means and each component as components in the block diagram is hardware composed of an electronic circuit block or the like. However, a part or all of the components are included in the code conversion device 20A. A software module configuration showing a state functionalized by a program that can be executed by.

  In this case, the hardware configuration includes a processor as a control unit. That is, the physical configuration is, for example, one or a plurality of processors and one or a plurality of memories, etc., but the software configuration by each component has a plurality of functions that the processor exhibits by controlling the program, respectively. Will be expressed as

  When the dynamic state in which the processor is executed by the program (the state in which each procedure constituting the program is executed) is functionally expressed, each component related to the execution part is configured in the processor. In a static state in which the program is not executed, the entire program (or each program part included in the configuration of each unit) that realizes the configuration of each unit is stored in a storage area such as a memory.

  Each unit (means) described above may be configured such that a computer functionalized by a program can be realized together with the function of the program, or a plurality of electronic circuits permanently functionalized by specific hardware You may comprise with the apparatus which consists of a block.

  In the above description, the operation content of each step described above, the constituent elements of each unit, and the functions thereof may be programmed (software program) and executed by a computer. The method described above can also be realized by a computer reading a program from a recording medium and executing it. That is, the structure which recorded the above-mentioned program on the information recording medium may be sufficient.

[Second Embodiment]
Next, a second embodiment of the code conversion system according to the present invention will be described with reference to FIGS.
FIG. 6 is a block diagram showing a code conversion system according to the second embodiment.

  In FIG. 6, in the second embodiment, the code conversion device 20B in the code conversion system 100 includes a Unicode 0 plane segment generation unit 25 in the configuration of the code conversion device 20A of the first embodiment described above. The difference is that the Unicode UTF-16 encoding unit 24 is replaced with the Unicode UTF-8 encoding unit 26.

(Detailed configuration)
The Unicode 0 plane section generation unit 25 of the above-described code conversion system uses the value referenced by the basic multilingual plane conversion unit 21 as the lower 2 bytes in UTF-32, and a fixed value indicating the basic multilingual plane in the upper 2 bytes. Append.

  In addition, the Unicode UTF-8 encoding unit 26 converts the plane segment information (UTF-32 encoding format) generated by the Unicode plane segment generation unit 23 or the Unicode 0 plane segment generation unit 25 into UTF-8 (1 to 0). 4 bytes).

  Furthermore, the Unicode UTF-8 encoding unit 26 as the second encoding function, which is a part of the encoding unit, is generated by the Unicode plane segment generation unit 23 as the first generation unit. A function of outputting the second code by performing an encoding process on the second intermediate code of two information amounts in the second encoding format (UTF-8) in which the information amount of the encoding result is variable length ing.

Here, the post-conversion processing means 29b is composed of the Unicode plane segment generation unit 23, the Unicode 0 plane segment generation unit 25, and the Unicode UTF-8 encoding unit 26.
The post-conversion processing means 29b performs a predetermined calculation process on the second code of the first information amount outside the range obtained from the basic multilingual surface conversion unit 21, and performs the second information amount of the second information amount. A Unicode 0 plane section generation unit 25 is provided as a third generation unit that generates 3 intermediate codes.

  The Unicode UTF-8 encoding unit 26 has a variable length information amount with respect to the third intermediate code of the second information amount generated by the Unicode 0 plane segment generation unit 25. 2 is further provided with a function of performing encoding processing in the encoding format 2 and outputting a second code.

Further, the Unicode 0 plane segment generation unit 25 as the third generation unit uses the second code of the first byte number obtained by the basic multilingual plane conversion unit 21 as the lower byte, and sets a second predetermined number. A function of adding a fixed value as the upper byte to the lower byte is provided.
Here, the second fixed value is a value indicating a basic multilingual plane of Unicode of the third encoding format (UTF-32).

  Further, the Unicode UTF-8 encoding unit 26 adds the second code of the first number of bytes as a lower byte and adds a predetermined second fixed value as an upper byte to the lower byte. The encoding format value is converted into Unicode of the second encoding format in which the amount of information of the encoding result is variable, and is output.

  The Unicode plane segment generation unit 23, which is the first generation unit, uses the first intermediate code obtained by the additional plane conversion unit 22 as the lower byte and the predetermined first fixed value as the upper byte. As a function to be added to the lower byte.

Here, the first code is a Kanji code, the second code is a Unicode of the first encoding format or the second encoding format, and the first fixed value is the first encoding format and It is a value which shows the Chinese character addition surface of the Unicode of the 3rd encoding format (UTF-32) different from the said 2nd encoding format.
Furthermore, the first encoding format is UTF (Unversal multi octet coded characterset Transformation Format) -16, the second encoding format is UTF-8, and the third encoding format is UTF-32. Suppose that

(Operation procedure)
Next, the operation of the second embodiment will be described with reference to the flowchart of FIG.

First, in the operation procedure in the code conversion system according to the second embodiment, when the encoding process is executed in the basic procedure (FIG. 5 / steps S111 to S115) according to the first embodiment, The second intermediate code generated by the generation process is subjected to the encoding process in the second encoding format in which the information amount of the encoding result is variable length, and the second code is output. The second encoding process is executed (FIG. 7 / step S206; second encoding process step, second encoding function).
Here, steps S201 to S204 in FIG. 7 are the same as steps S111 to S115 in FIG. 5 described above.

  In the operation procedure in the code conversion system according to the second embodiment, when the post-conversion process is executed in the basic procedure according to the first embodiment, it is out of the range obtained from the first conversion process. A third generation process for generating a third intermediate code of the second information amount by performing a predetermined arithmetic process on the second code of the first information amount is further executed (FIG. 7 / step S205). A third generation processing step, a third generation function).

  Further, when the second encoding process is executed, the information amount of the encoding result is variable with respect to the third intermediate code of the second information amount generated in the third generation process. Encoding processing is performed in the second encoding format, and the second code is output.

This will be described in detail below.
First, when the value acquired by the basic multilingual surface conversion unit 21 is within the range of D800h to DFFFh, this value is supplied to the additional surface conversion unit 22 as in the first embodiment.
If the value acquired by the basic multilingual plane conversion unit 21 is outside the range of D800h to DFFFh (“No” in step S201 shown in FIG. 7), this value is supplied to the Unicode 0 plane segment generation unit 25. To do.

  Next, the Unicode 0 plane segment generation unit 25 sets the supplied 2 bytes as the lower 2 bytes of UTF-32 and adds 0000h indicating the basic multilingual plane to the upper 2 bytes to obtain the Unicode plane segment score. A value to be expressed (UTF-32 encoding format) is generated (FIG. 7 / step S205).

  Subsequently, the value generated by the Unicode 0 plane section generation unit 25 is supplied to the Unicode UTF-8 encoding unit 26. Thereafter, the Unicode UTF-8 encoding unit 26 encodes and supplies the supplied 4 bytes of UTF-32 to UTF-8 (1 to 4 bytes of variable length) (FIG. 7 / step S206).

Next, the effect of the second embodiment will be described.
The second embodiment is configured to supply the value obtained by the basic multilingual surface conversion unit 21 and the additional surface conversion unit 22 to the Unicode UTF-8 encoding unit 26 after setting the value as UTF-32. ing. For this reason, it is possible to convert Kanji 2-byte code to Unicode (UTF-8).

In the second embodiment, the basic multilingual plane conversion table storage unit 31 and the additional plane conversion table storage unit 32 stored on the storage device 30, and the basic multilingual plane conversion unit 21 that refers to them and the addition are added. The surface conversion unit 22 has the same configuration as the Unicode (UTF-16) conversion according to the first embodiment.
For this reason, the conversion unit and the conversion table can be used for the conversion of UTF-16 and UTF-8, and therefore the conversion of UTF-8 can be performed without increasing the code conversion table.

Other configurations, other steps or functions, and the effects thereof are the same as those in the first embodiment described above.
In the above description, the operation content of each step described above, the constituent elements of each unit, and the functions thereof may be programmed (software program) and executed by a computer.

[Third Embodiment]
Next, a third embodiment according to the present invention will be described with reference to FIGS.

  8, in the code conversion system 200 according to the third embodiment, the code conversion device 20C replaces the additional surface conversion unit 22 with the additional surface N conversion unit in the code conversion device 20A according to the first embodiment disclosed in FIG. 27 is different from the point replaced with the Unicode plane division generating unit 23 with the Unicode N plane division generating unit 28. Further, as shown in FIG. 8, the storage device 30 is different in that the additional surface conversion table storage unit 32 in the storage device 30 in the first embodiment disclosed in FIG.

When executing the code conversion, the additional surface N conversion unit 27 refers to the value stored in the additional surface N conversion table storage unit 38 using the values of D800h to DFFFh as keys.
The Unicode N plane segment generation unit 28 receives a 3-byte value, sets this value as the lower 3 bytes in UTF-32, and adds 00h to the upper 1 byte.

Here, the additional surface conversion table 38a in the additional surface N conversion table storage unit 38 corresponds to 2 bytes having a range of upper 8 bytes from D8h to DFh and lower 1 byte from 00h to FFh, as shown in FIG. The matrix table is stored, and the information of the plane section point of the conversion destination Unicode (lower 3 bytes of UTF-32) is stored in each element.
Here, on the implementation of the storage device 30, an image in which 3 bytes, which are elements of the table, are continuously stored in ascending order of the 2-byte value of the conversion source.

  Here, in the additional surface conversion table 38a, the third information amount is larger than the first information amount (2 bytes which is an example of the first byte number) and the second information amount (an example of the second byte number). (4 bytes) which is less than 3 bytes).

  More specifically, an additional surface N conversion table 38a as a third conversion table, which is an example of an additional surface conversion table, has a predetermined second code of the first number of bytes in the basic multilingual surface conversion table 31. A specific range first byte number second code within a specified range, a second code decomposition upper byte number (upper 1 byte) obtained by decomposing at least two upper bytes and lower bytes (D8h, etc.) and the second code decomposition lower byte number (lower 1 byte) other decomposition specific range second code (00h, etc.), and between the first byte number and the second byte number to be converted A fourth intermediate code (such as 02000Bh), which is an example of a first intermediate code having a third number of bytes (such as 3 bytes), has a data structure associated therewith.

  The additional surface N conversion unit 27 described above has a function of converting the specific range code into the first intermediate code of the third information amount (3 bytes) with reference to the additional surface N conversion table 38a. Yes.

Here, the post-conversion processing means 29c is composed of the Unicode N plane section generation unit 28 and the Unicode UTF-16 encoding unit 24.
Then, the post-conversion processing means 29c performs a predetermined calculation process on the first intermediate code of the third information amount obtained by the additional surface N conversion unit 27 described above, so that the second information A Unicode N plane section generation unit 28 is provided as a second generation unit that generates a second amount of the second intermediate code.

Further, the post-conversion processing means 29c has a code set in advance with respect to the second intermediate code of the second information amount generated by the Unicode N plane section generation unit 28 (second generation unit). A Unicode UTF-16 encoding unit 24, which is an encoding unit that performs encoding processing in an encoded format and outputs the second code.
Other configurations are the same as those of the first embodiment described above.

(Operation procedure)
Next, the operation of the third embodiment will be described with reference to FIG.
First, in the third embodiment, when the second conversion process is executed in the basic operation procedure in the first embodiment described above, the third information amount in the additional plane N conversion table 38a is equal to the first information amount. When the amount is larger than one information amount and smaller than the second information amount, the specific range code is converted into the first intermediate code of the third information amount with reference to the additional plane N conversion table 38a (FIG. 10 / step S303). Second conversion processing step, second conversion function).

  Further, when executing the post-conversion process, first, a predetermined calculation process is performed on the first intermediate code of the third information amount obtained in the second conversion process to perform the second process. A second generation process for generating the second intermediate code of the information amount is executed (FIG. 10 / step S304; second generation process step, second generation function).

  Subsequently, a code for performing the encoding process in a preset encoding format on the second intermediate code of the second information amount generated in the second generation process and outputting the second code The encoding process is executed (FIG. 10 / step S305; encoding process step, encoding process function).

This will be described in detail below.
First, when the value acquired by the basic multilingual plane conversion unit 21 is within the range of D800h to DFFFh, this value is supplied to the additional plane N conversion unit 27.

  Next, the additional plane N conversion unit 27 breaks down the supplied 2 bytes into an upper 1 byte and a lower 1 byte, and the element (conversion source After calculating the position storing the lower 3 bytes of the conversion destination UTF-32 corresponding to 2 bytes), the element is referenced and obtained (FIG. 10 / step S303).

The value acquired by the additional plane conversion unit 22 is supplied to the Unicode N plane section generation unit 28. Subsequently, the Unicode N plane division generation unit 28 sets the supplied 3 bytes (plane division point information) as the lower 3 bytes in UTF-32 and adds 00h (fixed value) to the upper 1 byte to generate the Unicode UTF A value of −32 is generated (FIG. 10 / step S304).
Thereafter, the value acquired by the Unicode N plane segment generation unit 28 is supplied to the Unicode UTF-16 encoding unit 24.

Next, effects of the third embodiment will be described.
In the third embodiment, the additional surface N conversion table 38a in the additional surface N conversion table storage unit 38 has a structure in which surface information is added to each element of the additional surface conversion table 32a.
For this reason, the conversion destination Unicode can be converted not only to the additional Chinese character plane (second plane) but also to other characters accommodated in the additional plane.

Other configurations, other steps or functions, and the effects thereof are the same as those in the first embodiment described above.
In the above description, the operation content of each step described above, the components of each unit, and the functions thereof may be programmed (software program) and executed by a computer.

[Other variations]
The apparatus and method according to the present invention have been described according to some specific embodiments thereof, but various modifications may be made to the embodiments described in the text of the present invention within the spirit and scope of the present invention. Is possible.

By the way, such an apparatus or system may exist independently, or may be used in a state of being incorporated in a certain device (for example, incorporated as a function of an electronic device). The idea is not limited to this and includes various aspects.
Furthermore, an electronic device equipped with a code conversion system may operate under program control and have a network-related communication function. Any computer such as a desktop, laptop computer, other information device having wireless / wired communication function, home information appliance (TV / portable music player / game machine), or similar computer may be used. .

  Furthermore, the present invention relates to character code conversion, and in particular, a method for converting a character string of a kanji 2-byte code to Unicode corresponding to JIS X 0213: 2004, and a conversion table when converting to a Unicode additional surface (4-byte code). Can be used for purposes such as storing a fixed length of 2 bytes.

Further, the scope of the present invention is not limited to the illustrated examples. Further, the above embodiments include various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. In other words, examples include combinations of the above-described embodiments or any one of them and any of the modifications.
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments.

  The present invention can be used in general computer systems.

DESCRIPTION OF SYMBOLS 1 Code conversion system 10 Input device 20A, 20B, 20C Code conversion device 21 Basic multilingual surface conversion part 22 Additional surface conversion part 23 Unicode surface point generation part (1st generation part)
24 Unicode UTF-16 encoding unit (encoding unit, first encoding function)
25 Unicode 0 plane section generator (third generator)
26 Unicode UTF-8 encoding unit (encoding unit, second encoding function)
27 Additional plane N conversion section 28 Unicode N plane section generation section (second generation section)
29a, 29b, 29c Post-conversion processing means 30 Storage device 31 Basic multilingual surface conversion table storage unit 31a Basic multilingual surface conversion table 32 Additional surface conversion table storage unit 32a Additional surface conversion table 38 Additional surface N conversion table storage unit 38a Addition Surface N conversion table 40 Output device

Claims (30)

An input device for inputting a first code relating to a first information amount of the number of bytes allocated in advance to one character information;
The input first code is a code system different from the first code with reference to a code conversion table provided in advance, and the second code corresponding to the first information amount for the character information or more. A code conversion device for converting to a second code according to the second amount of information in bytes;
The code conversion device is attached to the code conversion device, the first code of the first information amount is associated with the second code of the first information amount, and the value of the first information amount is used as an element The third multilingual plane conversion table, a part of the value of the first information amount, and the first intermediate code of the third information amount having a smaller number of bytes than the second information amount, and the third information A storage device comprising an additional surface conversion table whose elements are values of quantities;
An output device that outputs the second code of the first information amount or the second information amount converted by the code conversion device;
The code conversion device includes:
Refer to the basic multilingual surface conversion table, and refer to the additional surface conversion table when the first information amount is a partial range of the value of the first information amount. A second code that outputs a first intermediate code and generates and outputs the second code of the second information amount by performing a predetermined arithmetic process on the first intermediate code of the third information amount. A code conversion system having a generation output function. The code conversion system according to claim 1,
The additional surface conversion table of the storage unit is smaller than the second information amount and the specific range code within a predetermined range of the second code group of the first information amount in the basic multilingual surface conversion table. A data structure associated with the first intermediate code of the third information amount of the number of bytes,
The code converter is
It is determined whether or not the second code of the first information amount obtained by referring to the basic multilingual surface conversion table is within the range, and operates when it is determined that the second code is outside the range. A basic multilingual plane conversion unit that converts a code into a second code of the first information amount and outputs the second code;
The basic multilingual surface conversion unit operates when the second code of the first information amount is determined to be within the range, and refers to the additional surface conversion table to convert the specific range code into the third information amount. An additional surface conversion unit for converting the first intermediate code into
Post-conversion processing means for performing a predetermined arithmetic processing on the first intermediate code of the third information amount to generate the second code of the second information amount and outputting it;
A code conversion system characterized by comprising: The code conversion system according to claim 2,
The additional surface conversion table includes an information amount in which the third information amount is the same as the first information amount,
The additional surface conversion unit has a function of converting the specific range code into the first intermediate code of the first information amount with reference to the additional surface conversion table,
The post-conversion processing means is
A first generation unit that performs a predetermined calculation process on the first intermediate code of the first information amount obtained by the additional surface conversion unit to generate the second intermediate code of the second information amount When,
An encoding unit that performs an encoding process on the second intermediate code of the second information amount generated by the first generation unit in a preset encoding format and outputs the second code;
A code conversion system comprising: The code conversion system according to claim 2,
The additional surface conversion table is configured with an information amount in which the third information amount is larger than the first information amount and smaller than the second information amount,
The additional surface conversion unit has a function of converting the specific range code into the first intermediate code of the third information amount with reference to the additional surface conversion table,
The post-conversion processing means is
A second generation unit that generates a second intermediate code of the second information amount by performing a predetermined arithmetic process on the first intermediate code of the third information amount obtained by the additional surface conversion unit When,
An encoding unit that performs an encoding process in a preset encoding format on the second intermediate code of the second information amount generated by the second generation unit and outputs the second code;
A code conversion system comprising: The code conversion system according to claim 3,
The encoding unit encodes the second intermediate code of the second information amount generated by the first generation unit in a first encoding format in which the encoding result is the second information amount. A code conversion system comprising a first encoding function for performing processing and outputting the second code. The code conversion system according to claim 3,
The encoding unit encodes the second intermediate code of the second information amount generated by the first generation unit in a second encoding format in which the information amount of the encoding result is variable length. A code conversion system comprising a second encoding function for performing processing and outputting the second code. The code conversion system according to claim 6,
The post-conversion processing means performs a predetermined arithmetic process on the second code of the first information amount outside the range obtained from the basic multilingual conversion unit to perform a third calculation of the second information amount. A third generator for generating intermediate code;
The second encoding function is:
The third intermediate code of the second information amount generated by the third generation unit is subjected to an encoding process in the second encoding format in which the information amount of the encoding result is variable length, and A code conversion system further comprising a function of outputting two codes. The code conversion system according to claim 7, wherein
The first information amount is a first number of bytes;
The second information amount is a second number of bytes;
The additional plane conversion table includes at least two higher order specific range codes having the first number of bytes within a predetermined range in the second code group having the first number of bytes in the basic multilingual plane conversion table. Matrix table in which one decomposition specific range second code of the upper byte decomposed for each byte and lower byte and another decomposition specific range second code of the lower byte are associated with the first intermediate code of the conversion destination Format data structure,
The additional surface conversion unit is
The position where the element of the additional plane conversion table is stored is calculated from the value of one disassembly specific range second code of the upper byte and the value of the other disassembly specific range second code of the lower byte. A code conversion system comprising a function for obtaining an intermediate code value. The code conversion system according to claim 8,
The first generation unit has a function of adding the first intermediate code obtained by the second conversion means as a lower byte and adding a predetermined first fixed value as an upper byte to the lower byte. A code conversion system characterized by The code conversion system according to claim 9, wherein
The third generation unit adds the second code of the first number of bytes obtained by the first conversion means as a lower byte and adds a predetermined second fixed value as an upper byte to the lower byte. A code conversion system characterized by having a function to perform. The code conversion system according to claim 10,
The first code is a Kanji code;
The second code is a unicode of either the first encoding format or the second encoding format;
The code conversion system characterized in that the first fixed value is a value indicating an additional surface of Unicode characters in a third encoding format different from the first encoding format and the second encoding format. . The code conversion system according to claim 11, wherein
The code conversion system according to claim 2, wherein the second fixed value is a value indicating a basic multilingual plane of Unicode in the third encoding format. The code conversion system according to claim 12,
The second encoding function in the encoding unit is:
The value of the third encoding format obtained by adding the second fixed number of the first byte number as the lower byte and adding a predetermined second fixed value as the upper byte to the lower byte, and the information amount of the encoding result A code conversion system characterized by having a function of converting to Unicode of a second encoding format having a variable length and outputting the same. The code conversion system according to claim 13, wherein
The first encoding format is UTF (Universal multi octet coded characterset Transformation Format) -16, the second encoding format is UTF-8, and the third encoding format is UTF-32. A code conversion system characterized by that. By inputting a first code of a first information amount pre-assigned to one character information and referring to one or both of the basic multilingual plane conversion table and the additional plane conversion table, A code conversion device that is a code system different from the first code and converts the character information into a second code in which the case of the first information amount or the case of the second information amount larger than this may exist, and outputs the second code There,
The basic multilingual plane conversion table has a data structure in which the first code of the first information amount and the second code of the first information amount are associated with each other and the value of the first information amount is an element. ,
The additional surface conversion table has a data structure in which a part of the element is associated with a first intermediate code having a third information amount smaller than the second information amount and the value of the third information amount is used as an element. And
As a result of referring to the basic multilingual surface conversion table, when the first code is a partial range of the element, the third information corresponding to the first code with reference to the additional surface conversion table The first intermediate code of the amount is output, and the first intermediate code of the third information amount is subjected to predetermined arithmetic processing to generate the second code of the second information amount and output it A code conversion device characterized by having a configuration to perform. When the first code relating to the first information amount of the number of bytes allocated in advance for one character information is input, the first code is referred to the code conversion table provided in advance. A code conversion device that converts a second code related to the first information amount with respect to the character information or a second code related to the second information amount having a larger number of bytes, and a code conversion device different from the code A basic multilingual that is attached to the code conversion device for the purpose, associates the first code of the first information amount with the second code of the first information amount, and uses the value of the first information amount as an element The surface conversion table, a part of the value of the first information amount and the first intermediate code of the third information amount having a smaller number of bytes than the second information amount are associated with each other, and the value of the third information amount is Elements and In the code conversion system with additional surface conversion table that,
By referring to one or both of the basic multilingual surface conversion table and the additional surface conversion table, the input first code is a code system different from the first code, and the character information The code conversion device converts the second information amount in the case of the first information amount or the case of the second information amount larger than this,
Thereafter, the converted second information amount of the first information amount or the second information amount is output to the outside,
In the conversion by the code conversion device,
Reference is first made to the basic multilingual surface conversion table, and when the reference result is a partial range of the element, the first intermediate of the third information amount is then referred to the additional surface conversion table. A code conversion method comprising: outputting a code, and performing a predetermined calculation process on the first intermediate code of the third information amount to generate the second code of the second information amount. The code conversion method according to claim 16, wherein
The additional plane conversion table includes a specific range code within a predetermined range in the second code group of the first information amount in the basic multilingual plane conversion table, and a third less than the second information amount. A data structure associated with the first intermediate code of the information amount is provided in advance,
For the conversion,
First, it is determined whether or not the second code of the first information amount obtained by referring to the basic multilingual plane conversion table is within the range. A code conversion method comprising: operating a basic multilingual plane conversion unit to convert the first code into a second code having the first information amount and outputting the second code. The code conversion method according to claim 16, wherein
The additional plane conversion table includes a specific range code within a predetermined range in the second code group of the first information amount in the basic multilingual plane conversion table, and a third less than the second information amount. A data structure associated with the first intermediate code of the information amount;
For the conversion,
First, it is determined whether or not the second code of the first information amount obtained by referring to the basic multilingual plane conversion table is within the range, and if it is determined to be within the range, the code conversion device An additional surface conversion unit is activated to perform conversion processing for converting the specific range code into the first intermediate code of the third information amount with reference to the additional surface conversion table,
A predetermined arithmetic process is performed on the first intermediate code of the third information amount, and the second code of the second information amount is generated by the post-conversion processing means of the code conversion device and is output. A code conversion method characterized by that. The code conversion method according to claim 18, wherein
In executing the conversion process,
When the third information amount in the additional surface conversion table is the same as the first information amount, the specific range code is changed to the first intermediate code of the first information amount with reference to the additional surface conversion table. Converted,
When executing the post-conversion processing,
First, a first calculation process is performed on the first intermediate code of the first information amount obtained in the second conversion process to generate a second intermediate code of the second information amount. Execute the generation process of
Subsequently, an encoding process is performed on the second intermediate code of the second information amount generated in the first generation process in a preset encoding format, and the second code is output. A code conversion method characterized by executing processing. The code conversion method according to claim 18, wherein
When executing the conversion process,
When the third information amount in the additional surface conversion table is larger than the first information amount and smaller than the second information amount, the specific range code is set to the third information amount with reference to the additional surface conversion table. Converting to the first intermediate code,
In executing the post-conversion processing,
First, the second intermediate code of the second information amount is generated by performing a predetermined arithmetic process on the first intermediate code of the third information amount obtained in the second conversion process. Execute the generation process of
Subsequently, an encoding process is performed on the second intermediate code of the second information amount generated in the second generation process in a predetermined encoding format and the second code is output. A code conversion method characterized by executing processing. The code conversion method according to claim 19, wherein
In executing the encoding process,
Encoding processing is performed on the second intermediate code of the second information amount generated in the first generation processing in the first encoding format in which the encoding result is the second information amount, and then A code conversion method comprising: executing a first encoding process for outputting the second code. The code conversion method according to claim 19, wherein
In executing the encoding process,
Encoding processing is performed on the second intermediate code of the second information amount generated in the first generation processing in the second encoding format in which the information amount of the encoding result is variable length, and then And a second encoding process for outputting the second code. The code conversion method according to claim 22,
When performing post-processing after the conversion,
A third intermediate code of the second information amount is generated by performing a predetermined arithmetic processing on the second code of the first information amount outside the range obtained from the first conversion processing; Execute the generation process of
In executing the second encoding process,
The third intermediate code of the second information amount generated in the third generation processing is subjected to encoding processing in the second encoding format in which the information amount of the encoding result is variable length, and then And outputting the second code to the code conversion method. When the first code relating to the first information amount of the number of bytes allocated in advance for one character information is input, the first code is referred to the code conversion table provided in advance. A code conversion device for converting to a second code having a code system different from the code, and the code conversion device for the code conversion device, the first code of the first information amount and the second code of the first information amount A basic multilingual plane conversion table which is associated with a code and has the value of the first information amount as an element, and a third portion comprising a part of the value of the first information amount and the number of bytes smaller than the second information amount A code conversion system comprising an additional surface conversion table associated with a first intermediate code of information amount and having the value of the third information amount as an element,
The input first code of the first information amount is different from the first code with reference to one or both of the basic multilingual plane conversion table and the additional plane conversion table, and the character information A code conversion function for converting into a second code when the number of bytes is the first information amount or a second information amount larger than the first information amount, and the converted first information amount or the second information amount Has an output processing function that outputs two codes,
In the code conversion processing function,
In the conversion process of the first code, when the basic multilingual plane conversion table is referred to and the reference result is in a part of the range of the element, the conversion process is performed by referring to the additional plane conversion table. A first intermediate code output processing function for outputting the first intermediate code of three information amounts; and a second arithmetic operation for the first intermediate code subjected to the output processing to perform a predetermined arithmetic processing on the second code of the second information amount A second code generation processing function for generating and outputting
A code conversion program characterized in that the above-mentioned processing functions are executed by a computer provided in the code conversion device. In the code conversion program according to claim 24,
The additional plane conversion table includes a specific range code within a predetermined range in the second code group of the first information volume in the basic multilingual plane conversion table and a third information volume smaller than the second information volume. A data structure associated with the first intermediate code in advance,
In the code conversion function,
The first code operates when it is determined that the second code of the first information amount obtained by referring to the basic multilingual plane conversion table is within the range, and is determined to be out of the range. A first conversion function for converting the first information amount into a second code of the first information amount and outputting the same
The second conversion function operates when it is determined by the first conversion function to be within the range, and converts the specific range code into the first intermediate code of the third information amount with reference to the additional surface conversion table. Conversion function,
And a post-conversion processing function that generates a second code of the second information amount by performing a predetermined arithmetic process on the first intermediate code of the third information amount, and outputs the second code.
A code conversion program characterized by having the contents of the code conversion program and causing the computer to execute them. The code conversion program according to claim 25,
In the second conversion function,
When the third information amount in the additional surface conversion table is the same as the first information amount, the specific range code is changed to the first intermediate code of the first information amount with reference to the additional surface conversion table. The content to be converted
In the post-conversion processing function,
First generation for generating a second intermediate code of the second information amount by performing a predetermined arithmetic processing on the first intermediate code of the first information amount obtained by the second conversion function Function and encoding that performs encoding processing in a preset encoding format on the second intermediate code of the second information amount generated by the first generation function and outputs the second code Processing function,
The content of
A code conversion program for causing a computer to execute these. The code conversion program according to claim 25,
In the second conversion function,
When the third information amount in the additional surface conversion table is larger than the first information amount and smaller than the second information amount, the specific range code is set to the third information amount with reference to the additional surface conversion table. The content is the function to convert to the first intermediate code,
In the post-conversion processing function,
Second generation for generating a second intermediate code of the second information amount by performing a predetermined arithmetic process on the first intermediate code of the third information amount obtained in the second conversion processing Function and encoding that performs encoding processing in a preset encoding format on the second intermediate code of the second information amount generated by the second generation function and outputs the second code Processing function,
The content of
A code conversion program for causing a computer to execute these. The code conversion program according to claim 26, wherein
In the encoding processing function,
The second intermediate code of the second information amount generated by the first generation function is subjected to an encoding process in a first encoding format in which the encoding result is the second information amount, and the second information code The first encoding function for outputting the code is the content,
A code conversion program for causing a computer to execute this. The code conversion program according to claim 26, wherein
In the encoding processing function,
The second intermediate code generated by the first generation function is subjected to an encoding process in a second encoding format in which the information amount of the encoding result is variable length. The content is the second encoding function that outputs the code,
A code conversion program for causing a computer to execute this. The code conversion program according to claim 29,
In the post-conversion processing function, a predetermined calculation process is performed on the second code of the first information amount outside the range obtained from the first conversion function to perform a third calculation of the second information amount. The content is the third generation function that generates intermediate code.
In the second encoding function, the second encoding in which the information amount of the encoding result is variable length with respect to the third intermediate code of the second information amount generated by the third generation function. The content of the function of performing the encoding process in the format and outputting the second code,
A code conversion program for causing a computer to execute these.

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