CN112866389B - Slip protocol-based file transmission method and device in short-wave radio station communication - Google Patents
Slip protocol-based file transmission method and device in short-wave radio station communication Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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Abstract
The invention discloses a method and a device for file transmission in short-wave radio station communication based on a Slip protocol, which comprises the following steps: adding end marks to both file attributes and file contents; the character which is the same as the end mark appears in the file attribute and the file content at the sending end is transferred and sent to the receiving end; the receiving end receives the file of the sending end and carries out reverse meaning processing correspondingly, and the receiving end can distinguish the file attribute and the file content when receiving the file analysis and then carries out the file analysis. According to the invention, by improving the Slip protocol and adding the identifier to the transmission file attribute and the file content, the receiving end can identify the file attribute and the file content, and the purpose of transmitting the file is achieved.
Description
Technical Field
The invention relates to the field of short-wave radio station communication, in particular to a method and equipment for file transmission in short-wave radio station communication based on a Slip protocol.
Background
The short-wave radio station comprehensive communication system based on the Slip transmission protocol mainly communicates through a network port/serial port. The communication after the station successfully establishes the link is mainly to perform service transmission, wherein the most important service type in the service transmission is to transmit data stream. The method comprises the following steps: the terminal 1 sends data to the station 1. And the radio station 1 unpacks again according to the current network condition and then sends the unpacked data to the radio station 2 in sequence. The radio station 2 receives each data packet and forwards the data packet to the terminal 2. Terminal 2 receives the packet parsing.
The main function of the Slip protocol is to define a set of characters that assemble the data into frames. The concrete implementation is as follows: the Slip protocol defines 4 characters: end character (C0H), escape character (DBH), end substitute character (DCH) and escape substitute character (DDH). And adding an end character (C0H) to the head and the tail of each data frame, and packaging into a Slip frame. In the transmitted data frame, the same data as the end character (C0H) is replaced with an escape character (DBDC) plus a substitute character, and the same data as the escape character (DB) is replaced with an escape character (DBDD). At the receiving end, the Slip protocol performs the opposite substitution work on the data in the frame, namely changing "DBDCH" to "C0H" and "DBDDH" to "DBH".
Frame data length: represents the sum of the lengths of all content items, including A0H, the frame data length byte itself, the device ID, the data items (0-N), and the CRC check byte, excluding the characters added for Slip protocol encapsulation. The length limit is no greater than 190 bytes.
Source device ID: refers to the ID of the device that sent the data frame.
ID of the device: refers to the ID of the device that sent the data frame. The station ID is 40H and the terminal is 42H.
Signaling ID (command type): the information from and to the protocol is classified, the signaling ID is specified as 84H in the data stream service, and the parameter field is the actually transmitted data stream content.
Parameters are as follows: the data actually transmitted.
In the definition of the transmission data stream based on the existing Slip protocol, when a file is transmitted, file attribute information and file content information are both filled behind a signaling ID, that is, in a parameter field, because of the particularity of the file itself, a receiving end must know a file name and a file size first to continue analyzing the file content, which causes a problem: the receiving end cannot distinguish the file attribute information from the file content, so that file analysis cannot be performed, and file transmission cannot be realized. In fact, according to the existing protocol, file transfer cannot be realized. The invention improves the existing protocol, and the improved protocol well solves the problem that a receiving end analyzes the file when the short-wave radio station carries out the file transmission service.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention mainly improves the existing Slip protocol. The problem that a receiving end cannot analyze the file, namely cannot distinguish the file attribute from the file content is solved. Adding end marks to the file attributes and the file contents, simultaneously, carrying out escape on characters which are the same as the end marks in the file attributes and the file contents by the sending end, correspondingly, carrying out reverse-meaning processing on the receiving end, and further carrying out further analysis. And the effective file transmission among the short-wave stations is realized.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
a file transmission method in short-wave radio station communication based on a Slip protocol comprises the following steps:
s1 adding end marks to the file attribute and the file content;
s2, at the sending end, the characters with the same end identification in the file attribute and the file content are transferred and sent to the receiving end;
s3 the receiving end receives the file from the sending end and carries on reverse meaning process, the receiving end can distinguish the file attribute and the file content when receiving the file analysis, then carries on the file analysis.
Further, step S1 specifically includes:
s11 adding a file attribute identifier end character at the head and tail of each file attribute frame, and then performing Slip escaping and packaging to form an attribute Slip frame;
s12 adds a file content identifier end character at the head and tail of each file content frame, and then carries out Slip escaping and packaging to a content Slip frame.
Further, step S2 specifically includes:
s21, in the transmitted attribute Slip frame, replacing the data with the same character as the file attribute end by the file attribute escape character plus the file attribute end substitute character, and replacing the data with the same character as the file attribute escape character by the file attribute escape character plus the file attribute escape substitute character;
s22 replacing, in the transmitted content Slip frame, data having the same characters as the file-content-side characters with file-content escape characters plus file-content-side substitute characters, and replacing, in the transmitted content Slip frame, data having the same characters as the file-content escape characters with file-content escape characters plus file-content escape substitute characters.
Further, step S3 specifically includes:
s31, in the received attribute Slip frame, the Slip protocol carries out reverse substitution work on the data in the frame, namely changing the file attribute escape character plus the file attribute end substitution character into a file attribute end character, and changing the file attribute escape character plus the file attribute escape substitution character into a file attribute escape character;
s32, in the received content Slip frame, the Slip protocol carries out the opposite substitution work on the data in the frame, namely changing the file content escape character and the file content end substitution character into the file content end character, and changing the file content escape character and the file content escape substitution character into the file content escape character.
A file transmission device in short-wave radio station communication based on a Slip protocol comprises:
the sending terminal is used for adding terminal identifications to the file attributes and the file contents, and performing escape and sending on characters which are the same as the terminal identifications and appear in the file attributes and the file contents;
and the receiving terminal receives the file of the sending terminal and performs corresponding reverse meaning processing, and can distinguish the file attribute and the file content when receiving the file analysis and then perform the file analysis.
Further, the adding end identifiers for both the file attribute and the file content specifically includes:
adding a file attribute identifier end character to the head and the tail of each file attribute frame respectively, and then carrying out Slip escaping and packaging to obtain an attribute Slip frame;
and adding a file content identifier end character at the head and the tail of each file content frame, and then performing Slip escaping and packaging to form a content Slip frame.
Further, the escaping and sending the characters which appear in the file attribute and the file content and are the same as the end identifier specifically comprises:
in the sent attribute Slip frame, replacing data which is the same as the characters of the file attribute end by the file attribute escape characters and the file attribute end substitute characters, and replacing the data which is the same as the file attribute escape characters by the file attribute escape characters and the file attribute escape substitute characters;
in the transmitted content Slip frame, data identical to the characters of the file content end are replaced by the file content escape characters plus the file content end substitute characters, and data identical to the file content escape characters are replaced by the file content escape characters plus the file content escape substitute characters.
Further, the receiving the file of the sending end and performing the corresponding reverse meaning processing specifically includes:
in the accepted attribute Slip frame, the Slip protocol carries out reverse substitution work on data in the frame, namely changing a file attribute escape character plus a file attribute end substitution character into a file attribute end character, and changing the file attribute escape character plus the file attribute escape substitution character into a file attribute escape character;
in the received content Slip frame, the Slip protocol carries out reverse substitution work on data in the frame, namely the file content escape character plus the file content end substitution character is changed into a file content end character, and the file content escape character plus the file content escape substitution character is changed into a file content escape character.
The invention improves the prior Slip protocol and realizes the effective file transmission among short-wave power stations.
The file attribute and the file content are added with the end identification, so that the receiving end can distinguish the file attribute and the file content when receiving the analysis and then carry out the file analysis. And simultaneously, the sending end performs the escaping of the characters which have the same end identification in the file attribute and the file content, correspondingly performs the corresponding escaping processing at the receiving end, and further performs the further analysis. The description is as follows:
1. file attribute identifier end characters (F0H), escape characters (ABH), end substitute characters (ACH), and escape substitute characters (ADH). And adding an end character at the head and the tail of each file attribute frame, and then carrying out Slip escaping and packaging to form a Slip frame. In the transmitted data frame, the data identical to the end character is replaced with an escape character (ABAC) plus a substitute character, and the data identical to the escape character (AB) is replaced with an escape character (ABAD). On the receiving side, the Slip protocol performs the opposite substitution work for the data in the frame, i.e. changing "ABACH" to "F0H" and "ABADH" to "ABH".
2. File content identifier end characters (F1H), escape characters (FBH), end substitute characters (FCH) and escape substitute characters (FDH). And adding an end character at the head and the tail of each file attribute frame, and then carrying out Slip escaping and packaging to form a Slip frame. In the transmitted data frame, the data identical to the end character is replaced with an escape character (FBFC) plus a substitute character, and the data identical to the escape character (FB) is replaced with an escape character (FBFD). At the receiving end, the Slip protocol performs the opposite substitution work on the data in the frame, namely changing "FBFCH" to "F1H" and "FBFDH" to "FBH".
The invention has the beneficial effects that:
1. the invention realizes that the receiving end identifies the file attribute and the file content by improving the prior Slip protocol and adding the identifier to the file attribute and the file content to be transmitted, thereby achieving the purpose of transmitting the file.
2. The invention realizes that the receiving end can conveniently identify and analyze the file attribute and the content by respectively adding the file attribute identifier before and after the file attribute and the file content identifier before and after the file content.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a block diagram of a short wave radio communication assembly;
FIG. 2 is a protocol definition of a file attribute;
FIG. 3 is a protocol definition of the contents of a file;
FIG. 4 is a process flow of the transmit side performing an "F0F 1" escape;
fig. 5 is a flow of processing performed by the receiving side to perform "F0F 1" disambiguation.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
As shown in fig. 1 to 5, according to the file transmission method in short-wave radio station communication based on the Slip protocol according to the embodiment of the present invention, for convenience of understanding the above technical solution of the present invention, the above technical solution of the present invention is described in detail in the following by using a specific manner.
When the method is used specifically, the method for transmitting the file in the short-wave radio station communication based on the Slip protocol comprises the following steps:
defining file attribute identification: 0xF0, file content identification: 0xF 1.
A sending end: before sending, the file attribute is firstly subjected to 'F0F 1' escaping processing, then 0xC0 escaping processing and then sending are carried out, then the file content is subjected to 'F0F 1' escaping processing, then 0xC0 escaping processing and then sending are carried out.
1. After file attribute information of a file to be sent is acquired, the file is stored in a buffer area 1, wherein the length of the file is fixed to be 4 bytes, the file is less than 0 byte filled in high order, the file name is not more than 260 bytes at most, then 'F0F 1' escaping processing is carried out, the file is stored in a buffer area 2 after escaping, data in the buffer area 2 is read in blocks by taking 100 bytes as a unit, and parameter fields are filled in according to a Slip protocol format: the file attribute start mark, the data in the file attribute information buffer 2 after the escape and the file attribute end mark are subjected to 0xC0 escape processing and sent to a corresponding radio station until the file attribute is sent completely;
2. reading the file content in blocks by taking 100 bytes as a unit, then performing 'F0F 1' escaping processing, storing the file content in a buffer area 2 after escaping, and filling parameter fields according to the Slip protocol format: the parameter field is defined as: the file content starting identifier + the data of the file content buffer 2 after the escape + the file content ending identifier, wherein the file content length is 100-200 bytes, if the escape is not needed, the normal length is 100 bytes, if the escape is needed, the maximum possible 200 bytes are determined according to the actual content of the specific file. The file content length of the last packet is the actual length of the last packet actually remaining, which may not be 100 bytes.
Receiving end: the grouping is performed first and then the reverse sense processing is performed. When the sending end radio station transmits data, the data of the parameter field is unpacked and then transmitted for multiple times, and the radio station corresponding to the receiving end directly transmits the data to the corresponding terminal after receiving the data, so that when the receiving end receives the data stream, firstly, the data is packaged, namely, the received data stream is identified to be packaged according to the file attribute and the end identifier of the file content, then, the packaged data is subjected to further 'F0F 1' reverse meaning processing, and the file attribute and the file content are analyzed.
The process flow of receiving the group packet and "F0F 1" escape:
the initialization of the attribute identifier BegFileAtt of the start receiving file is set to 0, and the initialization of the content identifier BegFileCon of the start receiving file is set to 0.
1. Judging the received Data streams one by one according to byte Data;
2. if the file attribute identifier is the file attribute identifier and the initial received file attribute identifier BegFileAtt is 0, setting the initial received file attribute identifier BegFileAtt to 1 and simultaneously storing Data into the Lastdata of the buffer area;
3. if the file attribute identifier is the file attribute identifier and the beginning received file attribute identifier BegFileAtt is 1, the following processing is carried out:
1) storing Data into a buffer LastData;
2) performing reverse meaning processing on the content in the LastData buffer area, and storing the content in the FileAtt buffer area;
3) analyzing data in the buffer FileAtt after the derotation, namely file attribute information comprising a file name and a file length;
4) and when the setting is started, the received file attribute identifier BegFileAtt is 0, and the buffer area LastData is emptied.
4. If the file content identifier is the file content identifier and the file content identifier BegFileCon to start to receive is 0, setting the file content identifier BegFileCon to start to receive to be 1 and simultaneously storing Data into the Lastdata of the buffer area;
5. if the file content identifier is the file content identifier and the file content identifier BegFileCon to be received is 1, which indicates that a complete packet of file content information is received at the moment, the following processing is performed:
1) storing Data into a buffer LastData;
2) performing reverse meaning processing on the content in the buffer LastData, and storing the content in the buffer FileCon;
3) analyzing data in the buffer FileCon after the derotation, namely file content information;
4) setting the content identifier BegFileCon of the initial receiving file to be 0, and emptying a buffer area LastData;
6. if the Data does not belong to any of the 4 cases 2 to 5, the Data is stored in the buffer LastData.
The following table is a prior art signaling format
| Start identifier 0xC0 | Protocol data unit PDU | End identifier 0xC0 |
| 1 byte | N byte | 1 byte |
The following table shows the prior art protocol data unit generic data frame format
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A file transmission method in short-wave radio station communication based on a Slip protocol is characterized by comprising the following steps:
s1, adding end identifiers to the file attributes and the file contents, wherein the file attributes are file names and file sizes, and S1 specifically comprises the following steps:
s11 adding a file attribute identifier end character at the head and tail of each file attribute frame, and then performing Slip escaping and packaging to form an attribute Slip frame;
s12 adding a file content identifier end character at the head and tail of each file content frame, and then performing Slip escaping and packaging to form a content Slip frame;
s2, at the sending end, the characters with the same end identification in the file attribute and the file content are transferred and sent to the receiving end;
s3 the receiving end receives the file from the sending end and carries on reverse meaning process, the receiving end can distinguish the file attribute and the file content when receiving the file analysis, then carries on the file analysis.
2. The method for transmitting the file in the short-wave radio station communication based on the Slip protocol according to claim 1, wherein step S2 specifically includes:
s21, in the Slip frame of the transmitted attribute, the data with the same character as the file attribute end is replaced by the file attribute escape character plus the file attribute end substitute character, and the data with the same character as the file attribute escape character is replaced by the file attribute escape character plus the file attribute escape substitute character;
s22 replaces, in the transmitted content Slip frame, data having the same character as the file content end character with the file content escape character plus the file content end substitute character, and data having the same character as the file content escape character with the file content escape character plus the file content escape substitute character.
3. The method for transmitting the file in the short-wave radio station communication based on the Slip protocol according to claim 2, wherein step S3 specifically includes:
s31, in the received attribute Slip frame, the Slip protocol carries out reverse substitution work on the data in the frame, namely changing the file attribute escape character plus the file attribute end substitution character into a file attribute end character, and changing the file attribute escape character plus the file attribute escape substitution character into a file attribute escape character;
s32, in the received content Slip frame, the Slip protocol carries out the opposite substitution work on the data in the frame, namely changing the file content escape character and the file content end substitution character into the file content end character, and changing the file content escape character and the file content escape substitution character into the file content escape character.
4. A file transmission equipment in short-wave radio station communication based on Slip protocol is characterized by comprising:
the sending terminal is used for adding terminal identifications to the file attributes and the file contents, and performing escape and sending on characters which are the same as the terminal identifications and appear in the file attributes and the file contents;
the receiving end receives the file of the sending end and carries out corresponding reverse meaning processing, and when the receiving end receives the file analysis, the receiving end can distinguish the file attribute and the file content and then carries out the file analysis;
the adding end identifiers of the file attributes and the file contents specifically comprises the following steps:
adding a file attribute identifier end character to the head and the tail of each file attribute frame respectively, and then carrying out Slip escaping and packaging to obtain an attribute Slip frame;
and adding a file content identifier end character at the head and the tail of each file content frame, and then performing Slip escaping and packaging to form a content Slip frame.
5. The device for file transmission in short wave radio station communication based on the Slip protocol according to claim 4, wherein the escape and sending of the characters appearing in the file attributes and the file contents and having the same end identifier specifically comprises:
in the sent attribute Slip frame, replacing data which is the same as the characters of the file attribute end by the file attribute escape characters and the file attribute end substitute characters, and replacing the data which is the same as the file attribute escape characters by the file attribute escape characters and the file attribute escape substitute characters;
in the transmitted content Slip frame, the data identical to the file content end characters are replaced by the file content escape characters plus the file content end substitute characters, and the data identical to the file content escape characters are replaced by the file content escape characters plus the file content escape substitute characters.
6. The device for transmitting files in short-wave radio station communication based on the Slip protocol according to claim 5, wherein the receiving of the files at the transmitting end and the corresponding dersense processing specifically comprise:
in the accepted attribute Slip frame, the Slip protocol carries out reverse substitution work on data in the frame, namely changing a file attribute escape character plus a file attribute end substitution character into a file attribute end character, and changing the file attribute escape character plus the file attribute escape substitution character into a file attribute escape character;
in the received content Slip frame, the Slip protocol carries out reverse substitution work on data in the frame, namely the file content escape character plus the file content end substitution character is changed into a file content end character, and the file content escape character plus the file content escape substitution character is changed into a file content escape character.
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