JPH0398113A - 1-byte/2-byte character string bidirectional conversion system - Google Patents

Abstract

PURPOSE:To facilitate the conversion from a 1-byte/2-byte character string to a 2-byte/1-byte character string and vice versa by using a 1-byte/2-byte conversion table and a converting direction setting switch. CONSTITUTION:A CPU 11 is provided together with a main storage 12, an input device 13, an input control part 14 which controls the read of the device 13 in response to a command given from the CPU 11, and an output control part 16 which controls the write of an output device 15 with a command given from the CPU 11. Furthermore a converting direction setting switch 17 is added to decide the 1-byte/2-byte character string conversion or vice versa together with a 1-byte/2-byte conversion table 18 which contains the 2-byte characters corresponding to the 1-byte characters respectively. By such a constitution, the 1-byte/2-byte and 2-byte/1-byte bidirectional conversion is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a 1-byte 2-byte character string bidirectional conversion method, and particularly to a 1-byte 2-byte character string bidirectional conversion method used in an output device such as a printer.

[Conventional technology]

Some printers, which are output devices generally used for information processing, cannot print characters expressed in 2 bytes due to physical limitations. In addition, each model has an upper limit to the number of print lines per horizontal line, and this upper limit varies depending on the type of characters to be printed, usually 2-byte full-width characters, 1-byte characters,
The upper limit number increases in the order of byte characters and double-byte half-width characters. Therefore, a record composed of double-byte characters cannot be printed as is in one horizontal line. Therefore, you can convert the 2-byte character string to a 1-byte character string, but in the code system that makes up the characters,
There are usually no fixed conversion rules between byte-based character codes and 2-byte characters, and character codes cannot be converted by simple calculation processing, so printers, etc.
There is nothing that performs byte string mutual conversion.

[Problem to be solved by the invention]

As mentioned above, in the past, it was not possible to mutually convert between 1-byte characters and 2-byte characters through simple calculation processing, so despite having a printing device, there was a limit on the number of characters in line II for character string printing. The disadvantage is that it abandons the advantageous use of converting to a 1-byte string. [Means for Solving the Problems] The bidirectional conversion method for l-byte and 2-byte character strings of the present invention is as shown in FIG. 1, which is a block diagram of the present invention. Input means 1 reads a record or a record consisting only of characters expressed in 2 bytes into an input record buffer record by record, and sequentially transfers character strings in this input record buffer from the beginning to an input buffer for conversion. The conversion direction is determined by the conversion input buffer registration means 2 and a switch that sets whether to convert a 1-byte character string to a 2-byte character string or a 2-byte character string to a 1-byte character string. The conversion direction determining means 3 searches the 1-byte 2-byte conversion table that has 2-byte characters corresponding to each of the byte-based characters, and determines which characters are expressed in 1-byte or 2-byte characters corresponding to the characters in the input buffer for conversion. Select the characters you want,
1-byte 2-byte conversion table search means 4 for outputting to the conversion output buffer, output record buffer registration means 5 for sequentially storing the obtained converted characters from the conversion output buffer to the output record buffer, and the converted characters. It is constructed by having an output means 6 for outputting character strings in units of records from an output record buffer in which strings are stored. [Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, which includes a central processing unit 11, a main storage device 12, an input device l3, and controls reading of the input device 13 according to commands from the central processing unit 11. An input control section 14, an output device 15, an output control section 16 that controls writing to the output device 15 in accordance with commands from the central processing unit 11, and an input control section 14 that converts 1-byte characters to 2-byte characters or 2 The conversion direction setting switch 17 sets whether byte characters are to be converted to 1-byte characters, and the 1-byte 2-byte conversion table 18 has 2-byte characters corresponding to each 1-byte character.

Next, to proceed with the explanation of the operation of the above configuration, the central processing unit 11 first gives an instruction to the input control unit 14 to read one record. When the input control unit 14 receives an instruction to read one record, it activates the input device 13, sequentially transfers the read data sent from the input device 13 to the input record buffer area 21 of the main storage device 12, and divides each record. When detected, the operation of the input device 13 is stopped. Next, the central processing unit 11 transfers the contents of the first character of the data read into the input record buffer area 21 to the conversion input buffer area 22. At this time, the central processing unit 11 refers to the content of the conversion direction setting switch 17, determines whether the content of the input record buffer area 21 is a 1-byte character string or a 2-byte character string, and changes the transcription content to 1.
Set to byte or 2 bytes. If it is a 1-byte character, the central processing unit 11 searches the 1-byte 2-byte conversion table 18 in which a corresponding 2-byte character is registered to obtain the 2-byte character to be found. . Next, the central processing unit 11 transfers the obtained double-byte characters to the conversion output buffer area 23, and further transfers the contents of the conversion output buffer area 23 to the first two bytes of the output record buffer area 24. The process of converting from the input record buffer area 21 and storing the required data in the output record buffer area 24 is repeated sequentially starting from the first byte of each byte, and the final data in the input record buffer area 21 is This will continue until the end.

Furthermore, by changing the designation of the conversion direction setting switch 17, conversion from a 2-byte character string to a 1-byte character string can be performed in a similar manner. That is, by simply changing the setting of the conversion direction setting switch 17, the conversion direction can be switched from 1 byte to 2 bytes and from 2 bytes to 1 byte, realizing bidirectional conversion.

Next, the central processing unit 1 gives an instruction to the output control section 16 to output one record. When the output control unit 16 receives an instruction to write one record, it starts the output device 15, sequentially transfers the contents of the output record buffer area 21 to the file 20, and when all the data in the output record buffer area 24 has been transferred. , the output device 15 is stopped. In this way, data for one record of the file 19 storing pre-conversion data is converted into data for one record of the file 20 storing post-conversion data. The processing for this one record is file 19.
The same process is repeated until the final record of
The process ends when the data end of the file 19 is detected. As a result, all the contents of the file 19 can be converted to obtain the file 20 that stores the data to be obtained.

〔Effect of the invention〕

As explained above, the present invention converts a 1-byte character string to a 2-byte character string, and further converts a 2-byte character string into a 2-byte character string by a series of conversion processes using a 1-byte 2-byte conversion table and a conversion direction setting switch. This has the effect of easily realizing bidirectional conversion from to a 1-byte character string.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Input means, 2... Conversion input buffer registration means, 3... Conversion direction determination means, 4... 1 byte 2 byte conversion table search means, 5... Output record buffer registration means, 6... Output means, 1l... Central processing unit, 12... Main storage device, 13... Input device, 1
4... Input control unit, 15... Output device, 16...
Output control unit, 17... Conversion direction setting switch, 18.
...l byte 2 byte conversion table, 19.20...
File, 21... Input record buffer area, 22
... Input buffer area for conversion, 23... Output buffer area for conversion, 24... Output record buffer area.

Claims (1)

[Claims] An input means for reading into an input record buffer record by record a record consisting only of characters expressed in 1 byte or a record consisting only of characters expressed in 2 bytes, and a character string in this input record buffer. Conversion input buffer registration means for sequentially transferring from the beginning to the conversion input buffer, and whether to convert a 1-byte character string to a 2-byte character string or a 2-byte character string to a 1-byte character string. A conversion direction determination means that determines based on a set switch, and a 1-byte 2-byte conversion table having 2-byte characters corresponding to each 1-byte character is searched to correspond to the characters in the conversion input buffer. a 1-byte 2-byte conversion table search means for selecting a character expressed in 1 or 2 bytes and outputting it to a conversion output buffer; and sequentially storing converted characters from the conversion output buffer to an output record buffer. 1. A 1-byte and 2-byte character string bidirectional conversion method, comprising: an output record buffer registration means; and an output means for outputting a character string stored from the output record buffer in units of records.