CN106407129A - Data extraction method for embedded security protection device - Google Patents
Data extraction method for embedded security protection device Download PDFInfo
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- CN106407129A CN106407129A CN201510483265.6A CN201510483265A CN106407129A CN 106407129 A CN106407129 A CN 106407129A CN 201510483265 A CN201510483265 A CN 201510483265A CN 106407129 A CN106407129 A CN 106407129A
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Abstract
The invention provides a data extraction method for an embedded security protection device, and belongs to the field of data recovery. The classification analysis is performed according to normal data files, lost data files and overwritten data files when each partition is read by adopting a method for one-by-one reading according to partitions of a disk. When the normal data files are read, a file allocation record table of the partition is analyzed, used block records are analyzed from the table, and video data in the block records is read; and when the lost data files are read, the file allocation record table of the partition is analyzed, unused block records are analyzed from the table, video data in the block records is read, whether the video data is null or not is judged, and if the video data is not null, effective video data is extracted according to a video data structure of an embedded monitoring device. Based on the method, whether disk data is in a monitoring video data format of TIANDY or not can be quickly judged and effective video data files in the disk data can be extracted.
Description
Technical field
The invention belongs to data recovery field and in particular to embedded security device data extract method.
Background technology
The booming development having driven many industries of domestic economy, security industry exactly benefits from economic sending out
One of the most obvious industry of growth trend among exhibition process.Especially constantly develop in Video Supervision Technique
Today, the monitoring device of the specialty such as high-definition monitoring video, multi-angle video technique is in the multiple place of industry-by-industry
It is obtained for and effectively promote.Video monitoring equipment is for realizing making in stability and harmony safe social environment
Huge contribution.The video getting off captured by monitoring probe seems and is even more important.
Embedded system is that one kind is completely embedded into inside controlled device, is the special behaviour that application-specific designs
Make system, embedded system monitoring equipment is then that a control program is stored in the embedded place in read only memory
Reason device panel, for controlling and monitoring the device of camera probe.From overall performance, embedded hard
Disk videocorder has showed incomparable powerful superior function, and from current market share,
Through becoming the main product of security protection circle.
In developed country, the data that many monitoring devices store above is all to guarantee it through multiple duplication
Data storage possesses the safety of height.However, in order to save the spending of enterprise and reduce managerial difficulty
Degree, a lot of units holding monitoring device does not do excessive data safety measures, and this means that one
On denier equipment, the video data of storage is once lost or other faults, will make safety protection function and cannot rise
To related effect.Additionally, in some circumstances, also provide the truest for many cases, most reliable
Video evidence, becomes the foundation of law court's resolution.Therefore the data of monitoring device is extracted, with recovery, there is weight
Big meaning.
Because the storage of monitor video is the self-defining storage format of equipment vendors, different from any tradition
File system in meaning, this leads to traditional data recovery technique cannot be applied to the video data of monitoring equipment
In extracting and recovering.At present, after the deletion for embedded monitoring machine produce fragment file, cover after
Remaining file cannot recover, and the status attribute of the video file recovering can not be distinguish between.
The present invention relates to part technical term：
Data stream list：Refer to record the initial address of each ingredient in a file, data corresponding video
One block number of initial time is divided into two parts according to management region, the structure of data stream list again：Stream head and flow table table
?.Wherein stream head have recorded the number of flow table list item and the length of whole flow table, and flow table list item have recorded respectively
The initial address of ingredient and temporal information etc..
Content of the invention
The present invention is directed to the deficiencies in the prior art, there is provided the side that a kind of data of embedded security device is extracted
Method, can effectively solve the problem that prior art cannot be recovered the loss file of the unused area of monitoring equipment, use
Uncovered fragment file in region；Enable the recovery carrying out video data, but also file cannot be belonged to
The problems such as property is distinguish between.
For solving problem above, the technical solution used in the present invention is as follows：A kind of number of embedded security device
Method according to extracting, comprises the following steps：
S1 loads disk, and reading disk 0 sector auxiliary information；
Whether S2 detection disk meets the basic structure in storage file for the monitoring device, if meeting, skips to S3,
Do not meet and skip to S1；
S3 parses the partitioning scenario of disk, and parses the initial address of each subregion, size, boot sector address；
S4 parses each subregion of disk division successively, and the file reading this subregion in the boot sector of subregion divides
Join the address of table, when traveling through this table and reading out the passage of the corresponding video data of block of use, start-stop
Between previous piece and the information such as rear plot location, byte number of block use related to this block, and count
Calculate the corresponding address data area of this block, read the corresponding data of this address；
This part of S5 includes losing data and covers data；
S51 parses each subregion of disk division successively, reads the file of this subregion in the boot sector of subregion
The address of allocation table, travels through this table and reads out untapped piece, and calculate the corresponding data field of this block
Address, judges that whether the content of this address is empty, not for space-time according to embedded monitoring equipment video
Data structure extracts effective video data；
S52 parses each subregion of disk division successively, reads the file of this subregion in the boot sector of subregion
The address of allocation table, travels through the byte number that this table reads out the use of block of use, and calculates
The corresponding address data area of this block, judges in the content of this address, whether untapped part is empty, no
Extract effective video data for space-time according to the video data structure of embedded monitoring equipment；
After S6 is according to normal data, loss data, covering three kinds of classification reads data log of data, in conjunction with video literary composition
The format structure of part, its corresponding valid data of sub-category extraction；
S7 completes to extract：After the completion of data is extracted, it is marked to the video data extracting according to type；
The detailed process that S4 reads normal data is as described below：
The partition information of S41 reading disk, the main initial address of subregion including dividing, partition boot record ground
Location information, travels through each subregion and reads information；
S42 skips to first subregion and initiates, and reads according to ext4 form and parses subregion usage record；
S43, according to S42 analysis result, judges subregion service condition, if this subregion is using skipping to S44, otherwise
Skip to S47；
S44 reads the data file in each subregion；
S45 parses the data stream list in each data file, the data file starting point of parsing data stream list list item record
Location and file size；
S46 extracts video file according to the result of parsing in S45；
S47, according to the file extracting in time of video data, channel information labelling S46, completes to normal data
Extraction.
Preferably, the detailed process that S51 reads loss data is as described below：
The partition information of S511 reading disk, the main initial address in region including dividing, subregion guiding
Recording address information, travels through each subregion and reads information；
S512 is according to each partitioned parameters of format analysis of ext4 file system, and obtains the correlation of subregion clear area
Record；
S513 judges that subregion whether there is clear area, if existing, skipping to S514, otherwise skipping to S517；
S514 reads subregion clear area data message；
S515 extracts data according in the architectural feature parsing S514 of video data；
S516 extracts the data content in S515 corresponding to analysis result；
S517, according to the file extracting in time of video data, channel information labelling S516, completes to losing number
According to extraction.
Preferably, the detailed process that S52 reads covering data is as described below：
The partition information of S521 reading disk, the main initial address in region including dividing, subregion guiding
Recording address information, travels through each subregion and reads information；
S522 is according to each partitioned parameters of format analysis of ext4 file system, and obtains the related note of subregion use
Record；
S523 reads the data stream list record of each normal data file according to analysis result in S522；
S524 judges that each data file whether there is untapped byte, if existing, skipping to S525, otherwise skipping to
S528；
S525 reads the content of unused bytes；
S526 parses, according to the architectural feature of video data, the content reading in S525；
S527 extracts the result of parsing in S526；
S528, according to the file extracting in time of video data, channel information labelling S527, completes to covering number
According to extraction.
Beneficial effects of the present invention are as follows：
Present invention employs the method reading one by one according to the subregion of disk, read each subregion when according to
Normal data file, loss data file, covering data file carry out classification parsing.Reading normal data
During file, the file assignment record table of parsing subregion, parse the block record having used from this table, and read
Take wherein video data；When reading loss data file, the file assignment record table of parsing subregion, from this
Parse untapped piece of record in table, and read wherein video data and judge whether it is empty, do not press for space-time
Video data structure according to embedded monitoring equipment extracts effective video data；Cover data file reading
When, the file assignment record table of parsing subregion, parse the block record of use from this table and using block
Byte number, then reads the video data of wherein unused bytes, judges whether it is empty, does not press for space-time
Video data structure according to embedded monitoring equipment extracts effective video data.Based on said method, this
Bright can quickly judge whether data in magnetic disk is the monitor video data form of world great achievement it is also possible to extract
Effective video data file in data in magnetic disk, including normal data file, loses data file and covers number
According to file；The state that video data file is normal, loses, cover can also correctly be distinguished.
Brief description
Fig. 1 data in magnetic disk parses main flow；
Fig. 2 S4 reads normal data record flow process；
Fig. 3 S511 reads and loses data record flow process；
Fig. 4 S512 reads and covers data record.
Specific embodiment
For making the objects, technical solutions and advantages of the present invention become more apparent, develop simultaneously reality referring to the drawings
Apply example, the present invention is described in further details.
The data that the method for the present invention is primarily directed to world great achievement embedded monitoring equipment generation is parsed
Thus realize data and extracting and recover.
World great achievement monitoring device basic structure in storage file is described below.Monitoring device is in initialization
During disk, disk is divided into 4 regions (region of division hereinafter referred to as subregion), each subregion
Using file system be ext4, when storing video data successively using each subregion, and in subregion
Corresponding storage record data library file can be produced in this subregion, this document is stored in the during write data
One subregion.
Based on the logic of above-mentioned storage file, the thinking of data parsing of the present invention is：According to magnetic
The subregion of disk reads one by one, read each subregion when according to normal data file, lose data file,
Cover data file and carry out classification parsing.When reading normal data file, the file distribution note of parsing subregion
Record table, parses the block record having used from this table, and reads wherein video data；Lose number reading
During according to file, the file assignment record table of parsing subregion, parse untapped piece of record from this table, and read
Wherein video data is taken to judge whether it is empty, not the regarding according to world great achievement embedded monitoring equipment for space-time
Frequency is according to structure extraction effective video data；When reading covering data file, the file of parsing subregion divides
Join log, parse the block record of use from this table and using the byte number of block, then read wherein
The video data of unused bytes, judges whether it is empty, not for space-time according to world great achievement embedded monitoring
The video data structure of equipment extracts effective video data.
Embodiment：
S1 loads disk, and reading disk 0 sector auxiliary information；
Whether S2 detection disk meets the basic structure in storage file for the world great achievement monitoring device, if meeting, jumps
To S3, do not meet and skip to S1.Specifically, judge whether to meet world great achievement monitoring device in storage literary composition
The condition of basic structure during part has following two criterions：
Criterion one：The subregion of 4 ext types is comprised in the MBR structure of disk；
Criterion two：The file label in 2 sectors in each subregion is " Tiandy-DVR "；
S3 parses the partitioning scenario of disk, and parses the initial address of each subregion, size, boot sector address；
S4 parses first subregion that disk divides, and reads the middle record of this subregion in the boot sector of subregion
Index.db file, the information of normal file in the whole disk of record table record in this document,
Including the filename of file, file size, the beginning and ending time of file record video, file record video
Passage, the corresponding content of each data file is read according to the traversal disk partition of the information of above-mentioned reading；
This part of S5 includes losing data and covers data；
S51 parses each subregion of disk division successively, reads the free time of this subregion in the boot sector of subregion
Region, judges whether the content in this region is empty, not the regarding according to world great achievement monitoring device for space-time
Frequency is according to structure extraction effective video data；
S52 is according to analysis result in S4, and calculates not using of the data file recording in each index.db
Byte number, judges in the content of this address whether be empty, not for space-time according to world great achievement monitoring device
Video data structure extract effective video data；
After S6 is according to normal data, loss data, covering three kinds of classification reads data log of data, in conjunction with video literary composition
The format structure of part, its corresponding valid data of sub-category extraction；
S7 completes to extract：After the completion of data is extracted, it is marked to the video data extracting according to type.
Wherein, the detailed process of S4 reading normal data is as described below：
The partition information of S41 reading disk, the main initial address of subregion including dividing, partition boot record ground
The information such as location, travel through each subregion and read information；
S42 skips to first subregion and initiates, and reads and parse total block data and the free block of subregion according to ext4 form
The value of number；
S43, according to S42 analysis result, judges subregion service condition, if idle block number<Total block data represents this subregion
Using then skipping to S44, otherwise skip to S47；
S44 reads the index.db file in first subregion, reads the record table in index.db file
The filename of normal data file of record, file size, the beginning and ending time of file record video, literary composition
The passage of part record video, travels through the entire data files of the reading indeb.db record in each subregion；
S45 parses the data stream list in each data file, and specifically, data stream list list item record storage is in every number
According to tail of file, the skew with respect to end-of-file for the file flow table of each file last 4 byte records
Address, have recorded in this document flow table with respect at file flow table start offset address 0x20 byte
The number of the flow table list item of record, the initial address of flow table list item is relative file flow table start offset
0x28 byte, the length of each list item is 0x10 byte, 0x04～0x07 in each list item
Have recorded the initial time of the corresponding video data of list item, 0x08～0x0B have recorded list item record data phase
Side-play amount for top of file；
S46, can be according to " list item data length=list item data initial address-upper according to the result of parsing in S45
List item data initial address " calculates the length of a certain list item corresponding data, to extract any list item note
The data of record；
S47 creates set N, and the data extracted in S46 is left in collection according to the initial time sequencing of video
Close N, the form such as { N of set N0,N1,N2,…,Ni, wherein i is the integer more than or equal to 0, and collects
Close each of N element property contain the initial time of video file, file size, passage and
Document misregistration amount etc., completes the extraction to normal data；
S51 reads to be needed when losing data to come to clear area with reference to the video data format of world great achievement monitoring equipment
Data verified, the video data format of world great achievement monitoring equipment is described in detail below：The type monitors
Machine data is that opposing headers skew 0x04～0x07 is this data using 0x00000002 as data unit header
The length (this length is including data unit header) of cell block, opposing headers offset as 0x20～0x27 or
Person 0x38～0x3F is that data block can play labelling, and its tab character string is 0x000000016742001E, can
Whether the data verifying clear area according to this structure meets this feature.Extract the detailed process losing data
As described below：
The partition information of S511 reading disk, the main initial address in region including dividing, subregion guiding
The information such as recording address, travel through each subregion and read information；
S512 is according to each partitioned parameters of format analysis of ext4 file system, and obtains the correlation of subregion clear area
Record；
S513 judges that subregion whether there is clear area, if existing, skipping to S514, otherwise skipping to S517；
S514 reads subregion clear area data content；
S515 regards according to extraction packet great achievement containing the world in the architectural feature parsing S514 of world great achievement video data
Frequency data unit header 0x00000002；
S516 judges in S515 that the data of parsing whether there is can in the architectural feature meeting world great achievement video data
The video file play, if existing, skipping to S517, otherwise skipping to S518；
S517 extracts the data content corresponding to analysis result in S515 according to the architectural feature of video data；
S518 creates set L, and the data extracted in S46 is left in collection according to the initial time sequencing of video
Close L, each of the form of set L and set L element property is all consistent with set N, completes
To the extraction losing data；
The detailed process that S52 reads covering data is as described below：
The partition information of S521 reading disk, the main region including dividing is (referred to as：Subregion) initial
The information such as address, partition boot record address, travel through each subregion and read information；
S522 according to each partitioned parameters of format analysis of ext4 file system, and obtain partitioned record using area
The normal file information in domain, parsing can be according to content in S44 herein；
S523 reads the data stream list record information of each normal data file according to analysis result in S522, herein
Parsing refers to analysis result in S45；
S524 can be according to each list item size sum of the size of normal data file and record in each list item of file flow table
Magnitude relationship come to judge each data file whether there is untapped byte, if normal data file
Size>In each list item of file flow table record each list item size sum then represent exist untapped
Byte number then skips to S525, otherwise skips to S528；
S525 according to judged result in S524 in conjunction with S523 parsing parameter, using computing formula：Do not make
With each list item size sum of record in byte number=file size-each list item of file flow table, to read
The content of unused bytes；
S526 regards according to extraction packet great achievement containing the world in the architectural feature parsing S514 of world great achievement video data
Frequency data unit header 0x00000002；
S527 judges in S526 that the data of parsing whether there is can in the architectural feature meeting world great achievement video data
The video file play, if existing, skipping to S528, otherwise skipping to S529；
S528 extracts in the data corresponding to analysis result in S515 according to the architectural feature of world great achievement video data
Hold；
S529 creates set F, and the data extracted in S46 is left in collection according to the initial time sequencing of video
Close F, each of the form of set F and set F element property is all consistent with set N, completes
To the extraction covering data.
Those of ordinary skill in the art will be appreciated that, embodiment described here is to aid in reader and understands this
Invention implementation it should be understood that protection scope of the present invention be not limited to such special statement and
Embodiment.Those of ordinary skill in the art can make various according to these technology disclosed by the invention enlightenment
The various concrete deformation of other without departing from present invention essence and combination, these deformation and combination are still in the present invention
Protection domain in.
Claims (3)
1. the method that a kind of data of embedded security device is extracted is it is characterised in that comprise the following steps：
S1 loads disk, and reading disk 0 sector auxiliary information；
Whether S2 detection disk meets the basic structure in storage file for the monitoring device, if meeting, skips to S3,
Do not meet and skip to S1；
S3 parses the partitioning scenario of disk, and parses the initial address of each subregion, size, boot sector address；
S4 parses each subregion of disk division successively, and the file reading this subregion in the boot sector of subregion divides
Join the address of table, when traveling through this table and reading out the passage of the corresponding video data of block of use, start-stop
Between previous piece and the information such as rear plot location, byte number of block use related to this block, and count
Calculate the corresponding address data area of this block, read the corresponding data of this address；
This part of S5 includes losing data and covers data；
S51 parses each subregion of disk division successively, reads the file of this subregion in the boot sector of subregion
The address of allocation table, travels through this table and reads out untapped piece, and calculate the corresponding data field of this block
Address, judges that whether the content of this address is empty, not for space-time according to embedded monitoring equipment video
Data structure extracts effective video data；
S52 parses each subregion of disk division successively, reads the file of this subregion in the boot sector of subregion
The address of allocation table, travels through the byte number that this table reads out the use of block of use, and calculates
The corresponding address data area of this block, judges in the content of this address, whether untapped part is empty, no
Extract effective video data for space-time according to the video data structure of embedded monitoring equipment；
After S6 is according to normal data, loss data, covering three kinds of classification reads data log of data, in conjunction with video literary composition
The format structure of part, its corresponding valid data of sub-category extraction；
S7 completes to extract：After the completion of data is extracted, it is marked to the video data extracting according to type；
The detailed process that S4 reads normal data is as described below：
The partition information of S41 reading disk, the main initial address of subregion including dividing, partition boot record ground
Location information, travels through each subregion and reads information；
S42 skips to first subregion and initiates, and reads according to ext4 form and parses subregion usage record；
S43, according to S42 analysis result, judges subregion service condition, if this subregion is using skipping to S44, otherwise
Skip to S47；
S44 reads the data file in each subregion；
S45 parses the data stream list in each data file, the data file starting point of parsing data stream list list item record
Location and file size；
S46 extracts video file according to the result of parsing in S45；
S47, according to the file extracting in time of video data, channel information labelling S46, completes to normal data
Extraction.
2. a kind of embedded security device according to claim 1 data extract method it is characterised in that
The detailed process that S51 reads loss data is as described below：
The partition information of S511 reading disk, the main initial address in region including dividing, subregion guiding
Recording address information, travels through each subregion and reads information；
S512 is according to each partitioned parameters of format analysis of ext4 file system, and obtains the correlation of subregion clear area
Record；
S513 judges that subregion whether there is clear area, if existing, skipping to S514, otherwise skipping to S517；
S514 reads subregion clear area data message；
S515 extracts data according in the architectural feature parsing S514 of video data；
S516 extracts the data content in S515 corresponding to analysis result；
S517, according to the file extracting in time of video data, channel information labelling S516, completes to losing number
According to extraction.
3. the method that a kind of data of embedded security device according to claim 1 and 2 is extracted, its feature
It is, the detailed process that S52 reads covering data is as described below：
The partition information of S521 reading disk, the main initial address in region including dividing, subregion guiding
Recording address information, travels through each subregion and reads information；
S522 is according to each partitioned parameters of format analysis of ext4 file system, and obtains the related note of subregion use
Record；
S523 reads the data stream list record of each normal data file according to analysis result in S522；
S524 judges that each data file whether there is untapped byte, if existing, skipping to S525, otherwise skipping to
S528；
S525 reads the content of unused bytes；
S526 parses, according to the architectural feature of video data, the content reading in S525；
S527 extracts the result of parsing in S526；
S528, according to the file extracting in time of video data, channel information labelling S527, completes to covering number
According to extraction.
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