JP2003087326A - Communication device, communication method, program and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication device in which the usage efficiency of a memory is improved, a communication method, a program and a storage medium. SOLUTION: The communication method includes a step S202 for deciding whether or not received text data are encoded and generated before reception of the text data in the case of receiving the text data, a step S203 for receiving the text data and decoding the received text data at the same time when it is decided that the received text data are encoded and generated, and a step S204 for storing the generated data as a result of decoding the text data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device, a communication method, a program and a storage medium.

[0002]

2. Description of the Related Art Conventionally, sending and receiving of mail between communication devices is generally performed by text data.
That is, the image data attached to the mail is once converted into text data and transmitted.

Further, when receiving text data, the receiving device judges whether the text data is originally image data or originally text data, and the text data is subjected to text conversion. If it is determined that the image data has been received, it is returned to the image data and displayed or printed.

Here, the encoding system used for encoding the text data in the transmission side device is base64,
Methods such as uuencode and quoted-printable are generally known.

Of these, the base64 encoding system converts 3-byte data into 4-byte data. A 3-byte character is divided into four 6-bit data, and the divided 6
The bit code value and the table shown in FIG. 4 are used to replace the character. If the conversion source data is less than 3 bytes, the padding character is "="
Put in the part without data. For example, 0xff, 0x00,0xff
11111111 00000000 when converting 3 bytes
11111111 → 111111 110000 000011 111111 → 63 4
8 3 63 → Converted to '/''w''D''/', text '
It will be sent as / wD / '. Base64 like this
In the coding method of 1, the total data length is usually about 33% longer than that before coding.

The uuencode encoding system is also 3
Byte data is converted to 4 bytes, and 3-byte characters are decomposed into 4 by 6 bits, and the divided 6-bit code value and the table shown in FIG. 5 are used for correspondence. It replaces the character. Also,
In the uuencode encoding method, a character corresponding to the number of data contained in the line is added to the beginning of the line. For example, 0xff, 0
When converting 3 bytes of x00,0xff, 1111111 000
00000 11111111 → 111111 110000 000011 111111 →
63 48 3 63 → converted to'_ '' P ''#'' _ ',
Furthermore, since the conversion source data is 3 characters, it will be transmitted as text '#_ P # _' by adding '#' at the beginning.
Even with such a uuencode encoding method, the total data length is usually about 33% longer than that before encoding.

In the quoted-printable encoding method, a 7-bit character (most significant bit is 0) is used as it is without encoding, and an 8-bit character (most significant bit is 1) is "=". Is added to represent the character as a hexadecimal character. Whereas the above two methods make a group of 3 bit → 4 bit conversions, this method encodes one bit at a time. Specifically, conversion is performed according to the following three rules. 1: Characters of character code from 0x20 to 0x7E excluding "=", blanks and TAB are described as they are. 2: Characters that do not apply to Rule 1 are described in "=" + 2 digit hexadecimal format. 3: "=" at the end of the line indicates that the data continues to the next line. When there is no "=", the line feed shall be (CRLF).

For example, when converting 3 bytes of 0xff, 0x33, 0xff, since 0xff is a character larger than 0x7E, according to rule 2, 3-byte data of "= FF" (0x3D, 0x46, 0x46) Is converted to. Since 0x33 is a character with a size within the range of 0x20 to 0x7E, 0x33 remains unchanged and is not converted according to Rule 1. Therefore, 3 bytes of 0xff, 0x33, 0xff are quoted-pri
When converted to ntable, 0x3D, 0x46,0x46,0x33,0x3D, 0x46,0x
It is converted into a total of 7-bit data size of 46 ("= FF3 = FF"). In the quoted-printable encoding method, the data size after conversion increases as the number of characters that does not apply to rule 1 increases.

[0009]

FIG. 6 is a flow chart showing the flow of a conventional text data receiving process in a communication device which has received text data. Conventionally, when text data is received in step S601,
In step S602, the data is temporarily stored in the memory as it is, and then it is determined in step S603 whether or not the text data is encoded. If the text data is encoded and generated for transmission, Step S6
04, the image data is decoded, and step S605
I was outputting data. In addition, text data that has not been encoded is output as it is.

However, in such a method, since the text data for one mail is stored in the memory and then decrypted, the usage efficiency of the memory is low.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a communication device, a communication method, a program, and a storage medium with good memory usage efficiency. is there.

[0012]

In order to achieve the above object, the apparatus according to the present invention determines a receiving means for receiving text data and whether or not the received text data is coded and generated. Determining means for determining before receiving the text data, and receiving the text data by the receiving means when the determining means determines that the text data to be received is coded and generated. At the same time, it is characterized by comprising a decoding means for decoding the received text data, and a storage means for storing the data generated as a result of decoding the text data by the decoding means.

It is characterized in that the storage means also stores the encoding system of the text data.

The receiving means receives the text data as an electronic mail.

The determination means is characterized by determining whether or not the text data to be received is coded and generated by the header of the electronic mail.

In order to achieve the above object, the method according to the present invention comprises a receiving step of receiving an electronic mail, and analyzing the header of the electronic mail to encode the received electronic mail into text data. A determination step of determining whether or not there is, a step of decoding while receiving the text data when determining that the text data is encoded in the determination step, and a step of decoding the text data Storing the data generated by the above in a memory.

Another method according to the present invention is to determine whether or not the received electronic mail is encoded into text data by receiving the electronic mail and analyzing the header of the electronic mail. If it is determined in the determination step that the text data is encoded, a step of storing the encoding method in a memory, and the text data in the determination step When it is determined that the text data is encoded, it includes a step of decoding while receiving the text data, and a step of storing the data generated by decoding the text data in the memory. Is characterized by.

In order to achieve the above object, the program according to the present invention makes a processor included in a communication device receive a step of receiving an electronic mail, and analyzes a header of the electronic mail so that the received electronic mail is a text. A determination step of determining whether or not the data is encoded, and a step of decoding while receiving the text data when determining that the text data is encoded in the determination step And a step of storing the data generated by decoding the text data in a memory, are performed.

Further, according to another program of the present invention, the processor included in the communication device receives the e-mail and analyzes the header of the e-mail so that the received e-mail can be encoded into text data. A determination step of determining whether the encoded data is encoded, and a step of storing the encoding method in a memory when the determination is made that the text data is encoded. If it is determined in the determination step that the text data is encoded, a step of decoding while receiving the text data, and storing the data generated by decoding the text data in the memory And the step of performing.

In order to achieve the above object, a storage medium according to the present invention is characterized by storing the program.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, the relative arrangement of the constituent elements, the display screen, and the like described in this embodiment are not intended to limit the scope of the present invention to them unless otherwise specified.

(First Embodiment) An Internet FAX as a first embodiment of a communication apparatus according to the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a block diagram showing a schematic structure of the Internet FAX. In FIG. 1, the CPU 1
Reference numeral 01 is a control unit of the system, which controls the entire apparatus.
The ROM 102 is a memory for storing a control program for the CPU. The SRAM 103 is a memory that stores setting values registered by the operator, management data of the apparatus, various work buffers, and the like. The DRAM 104 is a memory for storing program control variables and the like. It also stores image data and text data. The reading unit 105 includes a device that optically reads an image on a document and converts it into binary data. The recording unit 106 is a device that outputs the image data stored in the DRAM to recording paper. The network communication control unit 107 is an interface for communicating with a network outside the FAX. The operation unit 108 includes a numeric keypad, a one-touch key, a mode key, a set key, and the like, and acquires setting data from an operator. The CODEC 109 includes a device that performs an encoding process and a decoding process of input image data. In addition, image reduction / enlargement processing is also performed here.

Next, the Internet F according to the present embodiment
The text data reception process in AX will be described. FIG. 2 is a flowchart showing the flow of text data reception processing in the Internet FAX according to this embodiment.

First, in step S201, the CPU
A processing request event for receiving an electronic mail from the network occurs in 101, and the reception processing of the text data as the electronic mail is started.

Next, in step S202, it is checked whether or not the received text data is encoded. Specifically, by analyzing the header portion sent prior to the text data body, information such as whether the text data was encoded and generated or what the encoding method is is obtained.

As a result of the analysis of the header, when it is determined that the text data received as the attachment file of the e-mail is generated by converting the image data into text, the text data is further received in step S203. Meanwhile, the decoding is performed for each minimum unit that can be decoded. That is, the decryption is performed at the same time when the text data is received.

Then, in step S204, the text data is decoded and the data resulting from the reduction of the data size is stored in the memory.

In step S202, if the received text data is not the one generated by encoding but the original text data, the decoding process is not performed,
The process proceeds to step S204 as it is, and the data is stored in the memory.

The data stored in the memory is recorded in the recording unit 10.
The data is output for printing on recording paper by 6, or transferring to another communication terminal.

According to this embodiment, it is possible to store text data with a smaller memory usage amount.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The present embodiment is different from the first embodiment in that the encoding method is stored when the text data is decoded.

Since the basic operation flow is the same as that shown in FIG. 2, only different processes will be described.

If the text data received from the network is determined to be the text data generated as a result of the encoding in step S202, the text data is received in step S20.
Decrypt the text data in step 3, and
The encoding method is stored in step S301.

According to this embodiment, the reverse conversion of the received data into the coded state can be easily performed.

The order of step S203 and step S301 in FIG. 3 may be reversed.

The present invention is not limited to the Internet FAX, but may be applied to a communication system including a plurality of other devices (eg, host computer, interface device, reader, printer, etc.). It may be applied to a communication device (for example, a copying machine, a facsimile device, etc.) which is composed of one device.

Further, an object of the present invention is to supply a storage medium (or recording medium) recording a program code of software for realizing the functions of the above-described embodiment to a system or apparatus, and to supply a computer of the system or apparatus Alternatively, by the CPU or MPU) reading and executing the program code stored in the storage medium,
It goes without saying that it will be achieved. In this case, the program code itself read from the storage medium realizes the functions of the above-described embodiments, and the storage medium storing the program code constitutes the present invention.
Further, by executing the program code read by the computer, not only the functions of the above-described embodiments are realized, but also based on the instruction of the program code,
An operating system (OS) running on the computer does some or all of the actual processing,
It goes without saying that the processing includes the case where the functions of the above-described embodiments are realized.

Further, after the program code read from the storage medium is written in the memory provided in the function expansion card inserted into the computer or the function expansion unit connected to the computer, based on the instruction of the program code. , The CPU provided in the function expansion card or the function expansion unit performs some or all of the actual processing,
It goes without saying that the processing includes the case where the functions of the above-described embodiments are realized.

When the present invention is applied to the above-mentioned storage medium, the storage medium stores the program code corresponding to the above-described flowchart (shown in FIG. 2 and / or FIG. 3).

[0041]

According to the present invention, it is possible to provide a communication device, a communication method, a program, and a storage medium in which the memory usage efficiency is improved.

[Brief description of drawings]

FIG. 1 is an internet F according to a first embodiment of the present invention.
It is a figure showing the hardware constitutions of AX.

FIG. 2 is an internet F according to the first embodiment of the present invention.
It is a flowchart which shows the text data receiving process of AX.

FIG. 3 is an internet F according to a second embodiment of the present invention.
It is a flowchart which shows the text data receiving process of AX.

[Fig. 4] Fig. 4 is a diagram describing a base64 encoding method.

FIG. 5 is a diagram illustrating a uuencode encoding method.

FIG. 6 is a flowchart showing a text data receiving process of a conventional communication device.

Claims (9)

[Claims] 1. A receiving means for receiving text data, a judging means for judging whether or not the received text data is coded and generated, before the text data is received, and the judging means, When it is determined that the received text data is generated by being encoded, a decoding unit that decodes the received text data at the same time as the reception of the text data by the reception unit, and the decoding unit And a storage unit that stores data generated as a result of decoding the text data by the communication device. 2. The communication device according to claim 1, wherein the storage unit also stores the encoding system of the text data. 3. The receiving means receives the text data as an electronic mail.
The communication device according to 1. 4. The communication device according to claim 3, wherein the determination means determines whether or not the text data to be received is encoded and generated by the header of the electronic mail. 5. A receiving step of receiving an electronic mail, a determining step of analyzing whether or not the received electronic mail is encoded into text data by analyzing a header of the electronic mail, When it is determined that the text data is encoded in the determination step, the step of decoding while receiving the text data, and the data generated by decoding the text data is stored in a memory. A communication method comprising: 6. A receiving step of receiving an email, a step of analyzing the header of the email to determine whether the received email is text data encoded, or not. If it is determined in the determination step that the text data is encoded, a step of storing the encoding method in a memory, and the determination step determines that the text data is encoded In that case, the communication method includes: a step of decoding while receiving the text data; and a step of storing the data generated by decoding the text data in the memory. 7. A processor included in a communication device, a receiving step of receiving an electronic mail, and analyzing a header of the electronic mail to determine whether or not the received electronic mail is encoded into text data. A determination step of determining, a step of decoding while receiving the text data when determining that the text data is encoded in the determination step, and a step of decoding the text data A program characterized by executing the steps of storing data in a memory and. 8. A processor provided in a communication device, a receiving step of receiving an electronic mail, and analyzing a header of the electronic mail to determine whether the received electronic mail is encoded into text data. A judgment step of judging, a step of storing the coding method in a memory when the text data is judged to be coded in the judgment step, and the text data is coded in the judgment step. If it is determined that the text data has been decoded, a step of decoding the text data while receiving it, and a step of storing the data generated by decoding the text data in the memory, Characteristic program. 9. A storage medium having the program according to claim 7 or 8 stored therein.