WO2011157074A1

WO2011157074A1 - Method, device and system for transferring and checking data files

Info

Publication number: WO2011157074A1
Application number: PCT/CN2011/072118
Authority: WO
Inventors: 王光辉; 贾晓强; 谢大
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-13
Filing date: 2011-03-24
Publication date: 2011-12-22
Also published as: CN102281121A; CN102281121B

Abstract

The present invention discloses a method, device and system for transferring and checking data files. The main content includes: with the present invention, after dividing a data file into multiple data segments and calculating the respective Cyclic Redundancy Check (CRC) value for each data segment, a source device performs transmission for each data segment and the CRC value of the data segment respectively, thus enabling a target device which receives the data segments and CRC values of the data segments to check each data segment, and to promptly discover, before the data file has been transferred completely, errors which occur in the course of the data file transfer.

Description

Method, device and system for data file transmission and verification

The present invention relates to information and communication technologies, and more particularly to a method, device and system for data file transmission and verification. Background technique

In order to ensure the normal operation of the communication system, the data files are often involved in the transmission (including wireless transmission or wired transmission) between the devices in the communication system. The data file is lost due to poor network status or unstable transmission channel during transmission. Problems such as codec errors in packets or data files may cause errors in the contents of data files transmitted to the target device. In order to avoid the error of the content of the data file, the target device fails to use the incorrect data file to perform the business operation failure. After receiving the data file transmitted by the source device, the target device needs to verify the data file.

Currently, the method by which the target device verifies the received data file is for the check of the Cyclic Redundancy Check (CRC) field. The specific approach is:

First, the source device generates a data file to be transmitted, calculates a CRC value for the entire data file, and writes the calculated CRC value to a fixed position of the data file, and then transmits the CRC value to the target device;

Then, the target device recalculates the CRC value for the received entire data file, and compares the CRC value calculated by the target device with the CRC value written by the fixed position of the data file, thereby correcting the correctness of the received data file. Test. If the comparison result is that the CRC value calculated by the target device matches the CRC value written by the fixed position of the data file, it indicates that the data file has no error during transmission; otherwise, it indicates that the data file has an error during transmission.

In the verification process of the data file by the target device, both the source device and the target device calculate the CRC value for the entire data file, and therefore, only the target device completely receives the data file. After the device can verify the correctness of the data file transmission, even if some of the received data files have been wrong, they cannot be found in time. Summary of the invention

The embodiment of the invention provides a method, a device and a system for data file transmission and verification, which are used to solve the problem that the error in the data file transmission process cannot be found in time in the prior art.

A method of data file transmission, the method comprising:

The source device segments the data file to be transmitted to obtain a plurality of data segments;

The source device calculates a cyclic redundancy check CRC value for each data segment;

The source device transmits the data segment and the CRC value of the data segment to the target device.

The method further includes: after calculating a CRC value of each data segment, and transmitting the data segment and the CRC value of the data segment to the target device, the method further includes:

The source device places the CRC value of each data segment into the parameter segment, and calculates a CRC value of the parameter segment after the CRC value of the data segment is placed, and places the CRC value of the parameter segment into the parameter segment;

Correspondingly, the source device transmits the data segment and the CRC value of the data segment to the target device as:

The source device transmits the parameter segment and each data segment to the target device; wherein the parameter segment is transmitted before the data segment.

A method for data file verification, the method comprising:

The target device calculates a CRC value of the received data segment, and compares the calculated CRC value of the data segment with the CRC value of the received data segment;

If the target device determines that the calculated CRC value of the data segment matches the received CRC value of the data segment, it determines that the data segment verification is successful; if not, determines that the data segment verification fails.

Wherein, before the target device calculates the CRC value of the received data segment, the method further includes Includes:

The target device calculates a CRC value of the received parameter segment, and determines that the parameter segment is successfully verified when it is determined that the calculated CRC value of the parameter segment matches the CRC value of the parameter segment carried in the parameter segment;

The target device determines a CRC value for each data segment carried in the parameter segment.

Further, after determining that the data segment verification fails, the method further includes: the target device requests the source device to retransmit the data segment that fails the verification.

A device for data file transmission, the device comprising:

a segmentation module, configured to segment the data file to obtain a plurality of data segments;

a first CRC value calculation module, configured to calculate a cyclic redundancy check CRC value of each data segment;

A transmission module, configured to transmit a data segment and a CRC value of the data segment.

The segmentation module is further configured to generate a parameter segment;

The first CRC value calculation module is further configured to calculate a CRC value of a parameter segment after the CRC value of the data segment is placed;

Correspondingly, the device further includes:

An information placing module, configured to: put a CRC value of each data segment into the parameter segment, and place a CRC value of the parameter segment into the parameter segment;

The transmission module is further configured to transmit a parameter segment; wherein the parameter segment is transmitted before the data segment.

A device for verifying data files, the device comprising:

a receiving module, configured to receive a data segment and a CRC value of the data segment;

a second CRC value calculation module, configured to calculate a CRC value of the received data segment; a verification module, configured to perform a CRC value of the data segment calculated by the second CRC value calculation module and a CRC value of the received data segment Compare, if calculated CRC of the data segment When the value matches the received CRC value of the data segment, it is determined that the data segment is successfully verified; when there is no match, it is determined that the data segment verification fails.

Further, the receiving module is further configured to receive a parameter segment and a CRC value of the parameter segment;

The second CRC value calculation module is further configured to calculate a CRC value of the received parameter segment; the verification module is further configured to determine a CRC value of the calculated parameter segment and a parameter segment carried in the parameter segment When the CRC values match, it is determined that the parameter segment verification is successful.

The device further includes:

And an information determining module, configured to determine a CRC value of each data segment carried in the parameter segment. Further, the verification module is further configured to request, after determining that the data segment verification fails, to retransmit the data segment that fails the verification.

A data file verification system, the system includes a source device and a target device; wherein, the source device is configured to segment the data file, obtain a plurality of data segments, and calculate a cyclic redundancy check CRC of each data segment. a value, and transmitting the data segment and the CRC value of the data segment to the target device;

a target device, configured to calculate a CRC value of the received data segment, and compare the calculated CRC value of the data segment with a CRC value of the received data segment, if the CRC value of the calculated data segment is determined and received When the CRC value of the data segment matches, it is determined that the data segment is successfully verified; when there is no match, it is determined that the data segment verification fails.

The invention divides the data file into a plurality of data segments by the source device, and after calculating the CRC value of each data segment, respectively transmits the CRC values of each data segment and the data segment, so that the data segment and the data segment are received. The target device of the CRC value can be verified for each data segment, so that the target device can timely discover errors occurring during the data file transmission when the data file has not been completely transmitted. DRAWINGS

1 is a schematic flowchart of an implementation of a method for data file transmission according to an embodiment of the present invention; and FIG. 2(a) is a schematic diagram of a data file according to an embodiment of the present invention;

2(b) and 2(c) are schematic diagrams of segmented data segments based on different segmentation methods in the first embodiment of the present invention;

3 is a schematic flowchart of a method for verifying a data file according to Embodiment 2 of the present invention; FIG. 4 is a schematic structural diagram of a data file transmission device according to Embodiment 4 of the present invention;

5 is a schematic structural diagram of a data file verification device according to Embodiment 5 of the present invention;

FIG. 6 is a schematic structural diagram of a data file verification system according to Embodiment 6 of the present invention. detailed description

In order to achieve the object of the present invention, an embodiment of the present invention proposes to segment a data file, calculate a CRC value for each data segment on the source device side, and send the data segment and the CRC value of the data segment to the target device. On the target device side, after receiving the data segment, the target device calculates the CRC value of the data segment again, and then matches the CRC value calculated by the target device for a certain data segment with the CRC value of the data segment sent by the source device, and further Determine if the verification of the data segment is successful. In the mode of the present invention, the target device can verify the correctness of the received data file when receiving part of the data file, and can timely discover when the partial data file sends an error, thereby improving the correct rate of data file transmission.

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Embodiment 1:

As shown in FIG. 1, a method for data file transmission according to Embodiment 1 of the present invention, the specific steps are as follows:

Step 101: The source device segments the data file.

In this step, the source device may segment the data file according to the preset number of data segments and the length of each data segment. This includes but is not limited to the following two segmentation methods. method one:

Set a segment length to divide the data file into multiple data segments according to the set segment length. If the data file length cannot be completely evenly divided, the length of the last data segment can be smaller than the set segment length. For example, as shown in Figure 2 (a), for a data file of length 0x00012000, only the 32-byte content at the beginning of the data file and the 32-byte content at the end are shown in Figure 2 (a). Set the segment length to 0x4000, as shown in Figure 2 (b), the entire data file is divided into 5 data segments, the length of the first 4 data segments is 0x4000, the last data segment is not full, only the length is 0x2000 Partially written content.

Method Two:

Divide the data file into multiple pieces of data of different lengths. For example, the data file is still as shown in Figure 2 (a) before the division, and the length is 0x00012000. The data file is divided into the data file as shown in Figure 2 (c). 4 data segments, each of which has a length of 0x2000, 0x6000, 0x7000, 0x3000, respectively.

After segmenting the data file in any of the above ways to obtain the data segment, it is necessary to sequentially assign the segment identifier to each data segment. For the convenience of description, the data segments are sequentially assigned identifiers 1 and 2 n.

Step 102: The source device calculates a cyclic redundancy check CRC value for each data segment.

After the source device divides the data file into multiple data segments, the cyclic redundancy check method is used to calculate the CRC value of each data segment.

After the source device calculates the CRC value of each data segment, the first embodiment of the present invention provides, but is not limited to, the following three methods for storing the CRC value of each data segment:

Method 1: Save the CRC value at a fixed position in each data segment.

The source device saves the calculated CRC value of each data segment at a fixed position of the corresponding data segment. Further, a fragment terminator may be added at the end of the content of the non-last data segment, and a file terminator may be added at the end of the content of the last data segment, so that the target device can It is enough to correctly judge whether the transmission of data fragments and data files is completed.

Method 2: Save the CRC value in the parameter fragment.

In the method, the source device adds a parameter segment to the data header of the data file, and allocates a segment identifier for the segment. For convenience of description, the segment is assigned an identifier of 0, and the length of the segment 0 may be based on actual data transmission requirements. Set as long as the length of segment 0 is greater than or equal to the space required for the content to be carried.

The source device writes the calculated CRC value of each data segment into segment 0. In order to enable the target device to correctly identify the CRC value of each data segment from the segment 0, the CRC value is written in the segment 0, and the data segment corresponding to each CRC value is also recorded; or, in segment 0, dedicated to storage The area of the CRC value of the data segment is sequentially written into the CRC value of the data segment according to the order of the identification of the data segment from small to large (or large to small), so that the target device reads and reads according to the order of the received data segment. The order of the CRC values correctly identifies the relationship between the data segment and the CRC value.

Further, the total length of the original file, the length of each data segment, and the length of the parameter fragment can also be written to the corresponding position of the segment 0. The above three parameters can be used by the subsequent target device to determine whether the transmission of the data file, a certain data segment or the parameter segment is completed.

After the above contents of the segment 0 need to be written, the source device calculates the CRC value of the segment 0, and writes the calculated CRC value of the parameter segment to the fixed position of the segment 0. Method 3: Save the CRC value In the request message.

The source device generates a request message, and stores the calculated CRC value of each data segment in a fixed location of the request message.

Further, the total length of the data file and the length of each data segment can be written to the corresponding location of the request message. The above two parameters can be used by the subsequent target device to determine whether the data file or the transmission of a certain data segment is completed, to determine the next operation. Step 103: The source device transmits the data segment and the CRC value of the data segment to the target device.

For the three methods for saving the CRC value in step 102, the following three transmission modes are also provided in this step:

If the source device saves the CRC value at a fixed location of each data segment, in this step, the source device directly transmits each data segment to the target device.

Transmission mode two:

If the source device saves the CRC value in the parameter segment of the additional setting, in this step, the device transmits the parameter segment and each data segment to the target device according to the condition that the parameter segment is transmitted before the data segment. Preferably, after the source device receives the response message that the parameter segment is successfully transmitted by the target device, the data segment may continue to be transmitted.

Transmission mode three:

If the source device saves the CRC value in the request message, since the content of the request message provides the basis for the subsequent operation of the data segment by the target device, the source device first transmits the request message to the target device, and after the request message is successfully transmitted, Continue to transfer the data fragments.

With the solution of the first embodiment of the present invention, the source device sends the data segment and the CRC value of each data segment to the target device in multiple manners. Since the data file is fragmented, the target device can target the data segment with a shorter length. Receiving and verifying data improves the accuracy of data file transmission.

Embodiment 2:

The second embodiment of the present invention provides a data file verification method based on the data file of the first embodiment. As shown in FIG. 3, the method includes the following steps:

Step 201: After receiving the data segment, the target device calculates a CRC value of the data segment. In this step, the target device and the source device calculate the CRC value of the data segment using the same algorithm.

Step 202: The target device compares the CRC value calculated by itself with the CRC value of the data segment sent by the source device. If the comparison result is that the CRC value matches, step 203 is performed; otherwise, step 204 is performed.

Step 203: The target device determines that the data segment is successfully verified.

Step 204: The target device determines that the data segment verification fails.

In the solution of the second embodiment, the manner in which the target device receives the data segment and the data segment is verified may also include the foregoing, in the solution of the second embodiment, the manner in which the source device receives the data segment. The following three:

Calibration mode one:

If the source device sends the CRC value of the data segment and the data segment to the target device according to the transmission mode in step 103, after the target device receives the data segment directly transmitted by the source device, first, the segment end character/file terminator of each data segment is determined. Whether the reception of the data segment/data file is completed, and the received data segment is verified. The verification mode is: when the target device receives a data segment, the CRC value of the data segment is calculated, and compared with the CRC value stored in the fixed position in the segment, if the two CRC values do not match, the data segment The verification fails, and the target device requests the source device to retransmit the data segment that failed the verification; otherwise, the verification of the data segment is successful, and the target device continues to receive and verify other data segments. Until the transmission of the entire data file is completed according to the end of the file, and each segment is successfully verified, the target device integrates each data segment to obtain the data file transmitted by the source device.

Check mode 2:

If the source device sends the CRC value of the data segment and the data segment to the target device according to the transmission mode in step 103, the target device first receives the parameter segment, and determines whether the parameter segment is transmitted through the length of the parameter segment provided in the parameter segment. In the judgment of receiving the complete parameters After the segment, the CRC value of the received parameter segment is calculated and compared with the CRC value stored in the fixed position of the parameter segment. If the two CRC values do not match, the verification of the parameter segment fails, and the source device is requested to retransmit the parameter segment. Otherwise, the verification of the parameter segment is successful, the target device extracts the CRC value of each data segment carried from the parameter segment, and verifies the data segment by using the extracted CRC value.

The target device can verify the received data segments in a single-threaded or multi-threaded manner.

In the single-thread check mode, after the target segment is successfully verified, the target device receives the first data segment, and determines whether the transmission of the first data segment is completed according to the length of each data segment in the parameter segment. After the complete first data segment, the CRC value of the first data segment is calculated and compared with the CRC value of the first data segment stored in the parameter segment. If the two CRC values do not match, the data If the verification of the fragment fails, the target device requests the source device to retransmit the data fragment that failed the verification; otherwise, the verification of the data segment succeeds, the second data segment continues to be received, and the second data segment is verified as described above. After checking, according to the total length of the original file in the parameter segment, it is judged that the entire data file has been transmitted, and each data segment is verified successfully, and the verification of the entire data file by the target device is completed.

It should be noted that, in the single-thread check mode, the target device can receive only one data segment at a time, and receive the next data segment when the data segment is successfully verified; the target device can also receive only N at a time ( N is a positive integer of more than 1 data segment, and then receives the following N data segments when all of the N data segments are successfully verified; if at least one of the N data segments is not verified successfully, Then, the target device will request the source device to retransmit the data segment whose verification fails, until all the N data segments are successfully verified.

In the multi-thread verification mode, after the target device successfully verifies the parameter segment, the target device checks the received complete data segment, and if there is still not received the complete data segment, the target device will perform the same. The data segment is verified while receiving other pieces of data. In When at least one data segment currently being verified is verified to be successful, the data segment that has not been subjected to data verification is continuously determined from the received data segments, and the data segment that continues to be determined is calculated.

The CRC value, and the data segment that continues to be determined; otherwise, the source device is requested to retransmit the data segment that failed the verification.

Check mode three:

If the source device sends the CRC value of the data segment and the data segment to the target device according to the transmission mode in step 103, the target device first receives the request message, and extracts the CRC value of each data segment and the total length of the original file from the request message. Information such as the length of each data segment.

After receiving the data segment, the target device determines whether the transmission of the data segment is completed according to the length of each data segment carried in the request message, and after determining that the complete data segment is received, calculates the CRC value of the received data segment, and requests The CRC value of the data segment carried in the message is compared. If the two CRC values do not match, the verification of the data segment fails, and the target device requests the source device to retransmit the data segment that failed the verification; otherwise, the data segment The verification succeeds, and the other data segments are continuously verified until the transmission of the entire data file is completed according to the total length of the data file in the request message, and each data segment is verified successfully, and the verification of the entire data file by the target device is completed.

Embodiment 3:

The third embodiment of the present invention describes the solutions of the first embodiment and the second embodiment by using specific examples.

For example, in the data file shown in FIG. 2 (a), the method in which the source device sends the data file to the target device and the target device checks the received data file includes:

In the first step, the segment length is set to 0x4000, and the data file is segmented according to the length of the segment. Since the total length of the data file is 0x00012000, the data file can be divided into five data segments, and each data segment is sequentially numbered as 1. 2...5 , the last data fragment is less than 0x4000 The size and segmentation results are shown in Figure 2 (b).

In the second step, a parameter fragment of size 0x4000 is added to the head of the data file, and the parameter fragment number is 0. In this embodiment, the data file after the parameter fragment is added may be referred to as a new file, and the data file when the parameter fragment is not added may be referred to as an original file. Since the total size of the data file is 0x00012000 before the parameter fragment is added, the offset of the original file content in the new file is 0x4000, and the size of each data segment is 0x4000 except for the last data segment.

In the third step, the CRC values are respectively calculated for the first to fifth data segments of the file, and CRC1, CRC2, CRC3, CRC4, and CRC5 corresponding to the first to fifth data segments are obtained, and the obtained CRC values are respectively written. The corresponding position in fragment 0.

In a fourth step, the total length of the data file, the length of each data segment, and the length of the parameter segment are placed at corresponding positions within the parameter segment.

In the fifth step, the CRC of the segment 0 after the information is added is calculated, and the fixed position of the segment 0 is written.

In the sixth step, the fragment 0 of the new file is transmitted to the target device.

In the seventh step, after the target device completely receives the segment 0 according to the length of the parameter segment, the segment 0 is verified.

The target device calculates the CRC value of the segment 0 and compares it with the CRC value of the segment 0 stored in the fixed position in the segment 0. If the comparison result is inconsistent, the verification fails, and the target device requests to re-download the segment 0, returning to the first Six steps; If the comparison result is consistent, the verification passes, indicating that the transmission of segment 0 is successful, and the eighth step is performed.

In the eighth step, the source device transmits a data segment to the target device.

In the ninth step, after the target device completely receives the data segment according to the length of the data segment, the CRC value of the segment is calculated, and the calculation result is compared with the CRC value of the data segment written in the segment 0, if two The CRC value is consistent, indicating that the data segment is successfully transmitted, and jumps to the tenth step; if it is determined that the CRC value is inconsistent, the request to re-download the data segment is performed again. When the data segment verification is successful, jump to the tenth step.

Step 10: The target device determines whether the data file has been completely received according to the total length of the data file and the length of the data segment, and if so, integrates the data segment that has been received and verified successfully into a data file, and ends the data file transmission. And the operation of the check; otherwise, jump to the eighth step.

Repeat steps 8 through 10, after all data segments have been transmitted and verified successfully, indicating that the entire file was successfully transferred.

Through the solution of the invention, the data file is divided into a plurality of data segments for transmission, and the target setting can effectively improve the accuracy of the transmission; meanwhile, when the target device finds that one or more data segments are transmitted incorrectly, only the source device needs to be requested. The data segment in which the transmission error occurs is retransmitted, which reduces the channel resources and transmission time required for retransmission, and improves the transmission efficiency of the data file.

Embodiment 4:

A fourth embodiment of the present invention provides a data file transmission device. As shown in FIG. 4, the device includes a segmentation module 11, a first CRC value calculation module 12, and a transmission module 13, where:

The segmentation module 11 is configured to segment the data file to obtain a plurality of data segments; the first CRC value calculation module 12 is configured to calculate a cyclic redundancy check CRC value of each data segment; and the transmission module 13 is configured to transmit the data segment. And the CRC value of the data segment.

The segmentation module 11 is further configured to generate a parameter segment; the first CRC value calculation module 12 is further configured to calculate a CRC value of a parameter segment after the CRC value of the data segment is placed; the transmission module 13 is further configured to transmit A parameter fragment, where the parameter fragment is transmitted before the data fragment.

The device further includes: an information placing module 14 configured to: place a CRC value of each data segment into the parameter segment, and place the CRC of the parameter segment into the parameter segment; further, the information is placed into the module 14 is also used to set the total length of the data file and the length of each data segment. And the length of the parameter segment is placed in the parameter segment.

Embodiment 5:

A fifth embodiment of the present invention provides a data file verification device. As shown in FIG. 5, the device includes a receiving module 21, a second CRC value calculation module 22, and a verification module 23, where:

The receiving module 21 is configured to receive the data segment and the CRC value of the data segment; the second CRC value calculating module 22 is configured to calculate the CRC value of the received data segment; the verifying module 23 is configured to calculate the second CRC value calculating module 22 The CRC value of the obtained data segment is compared with the CRC value of the received data segment. If the calculated CRC value of the data segment matches the received CRC value of the data segment, it is determined that the data segment is successfully verified; otherwise , to determine that the data fragment verification failed.

The receiving module 21 is further configured to receive a parameter segment and a CRC value of the parameter segment; the second CRC value calculating module 22 is further configured to calculate a CRC value of the received parameter segment; the verification module 23 is further configured to: When it is determined that the calculated CRC value of the parameter segment matches the CRC value of the received parameter segment, it is determined that the parameter segment verification is successful.

The device further includes: an information determining module 24, configured to determine a CRC value of each data segment carried in the parameter segment.

The verification module 23 is further configured to request to retransmit the data fragment that fails the verification after determining that the data segment verification fails.

The check module 23 is configured to calculate a CRC value of the at least one data segment after receiving at least one data segment, and calculate a CRC value of the at least one data segment and receive the at least one data Comparing the CRC values of the segments, when determining that the at least one data segment is successfully verified, continuing to receive the data segments, calculating a CRC value of the data segment that continues to be received, and verifying the data segments that continue to be received, Otherwise, the source device is requested to retransmit the data segment that failed the verification.

The verification module 23 is specifically configured to determine at least one number from the received data segments. After determining the CRC value of the determined at least one data segment, and calculating the calculated CRC value of the at least one data segment and comparing the CRC value of the at least one data segment, When at least one data segment is successfully verified, the data segment that has not been verified by the data segment is determined from the received data segment, and the CRC value of the data segment that continues to be determined is calculated, and the data segment that continues to be determined is verified. Otherwise, the source device is requested to retransmit the data fragment that failed the verification. The functions of the data file transmission and the data file verification in the first embodiment to the second embodiment may be implemented in a physical device, and the physical devices integrated in the fourth embodiment and the fifth embodiment are used to transmit data files to other devices. The data transmission operation may be implemented by using the function module involved in the fourth embodiment. At the same time, when receiving the data file transmitted by the other device, the physical device may perform the verification operation by using the function module involved in the fifth embodiment.

A sixth embodiment of the present invention provides a data file verification system. As shown in FIG. 6, the device includes a source device 31 and a target device 32, where:

The source device 31 is configured to segment the data file, obtain a plurality of data segments, calculate a CRC value of each data segment, and send the data segment and the CRC value of the data segment to the target device 32; the target device 32 is configured to target Receiving the data segment, calculating a CRC value of the data segment, and comparing the calculated CRC value of the data segment with the CRC value of the received data segment, if determining the CRC value of the calculated data segment and the received If the CRC value of the data segment matches, it is determined that the data segment is successfully verified; otherwise, it is determined that the data segment verification fails.

The source device 31 involved in the sixth embodiment of the present invention may be the source device involved in the implementation of the first embodiment to the third embodiment, and has various functional modules involved in the fourth embodiment. The target device 32 is implemented in the first embodiment to the third embodiment. The target device involved in the present invention has various functional modules involved in the fifth embodiment, and details are not described herein again. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and the modifications of the invention

Claims

Claim

A method for data file transmission, characterized in that the method comprises:

The source device segments the data file to obtain multiple pieces of data;

2. The method according to claim 1, wherein after calculating the CRC value of each data segment and transmitting the data segment and the CRC value of the data segment to the target device, the method further includes:

3. A method for verifying data files, the method comprising:

The method of claim 3, wherein before the target device calculates the CRC value of the received data segment, the method further includes:

The target device calculates a CRC value of the received parameter segment, and determines that the CRC value of the calculated parameter segment matches the CRC value of the parameter segment carried in the parameter segment, The parameter segment verification is successful;

The method of claim 3, wherein after determining that the data segment verification fails, the method further includes:

The target device requests the source device to retransmit the data fragment that failed the verification.

6. A device for data file transmission, characterized in that the device comprises:

7. Apparatus according to claim 6 wherein:

The segmentation module is further configured to generate a parameter segment;

Correspondingly, the device further includes:

8. A device for verifying data files, the device comprising:

a second CRC value calculation module, configured to calculate a CRC value of the received data segment; a verification module, configured to perform a CRC value of the data segment calculated by the second CRC value calculation module and a CRC value of the received data segment Comparing, when the calculated CRC value of the data segment matches the received CRC value of the data segment, determining that the data segment is successfully verified; When matching, it is determined that the data segment verification failed.

9. Apparatus according to claim 8 wherein:

The receiving module is further configured to receive a parameter segment and a CRC value of the parameter segment; the second CRC value calculating module is further configured to calculate a CRC value of the received parameter segment; the verification module is further used to When it is determined that the CRC value of the calculated parameter segment matches the CRC value of the parameter segment carried in the parameter segment, the parameter segment verification is determined to be successful; the device further includes:

And an information determining module, configured to determine a CRC value of each data segment carried in the parameter segment.

10. Apparatus according to claim 8 wherein:

The verification module is further configured to, after determining that the data segment fails to be verified, request to retransmit the data segment that fails the verification.

A data file verification system, wherein the system includes a source device and a target device;

a source device, configured to segment the data file, obtain a plurality of data segments, calculate a cyclic redundancy check CRC value of each data segment, and transmit the data segment and the CRC value of the data segment to the target device;

a target device, configured to calculate a CRC value of the received data segment, and compare the calculated CRC value of the data segment with a CRC value of the received data segment, and determine a CRC value of the calculated data segment and the received When the CRC value of the data segment matches, it is determined that the data segment is successfully verified; when there is no match, it is determined that the data segment verification fails.