CN106095808B - A kind of method and apparatus that MDB file fragmentation restores - Google Patents
A kind of method and apparatus that MDB file fragmentation restores Download PDFInfo
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- CN106095808B CN106095808B CN201610375289.4A CN201610375289A CN106095808B CN 106095808 B CN106095808 B CN 106095808B CN 201610375289 A CN201610375289 A CN 201610375289A CN 106095808 B CN106095808 B CN 106095808B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1446—Point-in-time backing up or restoration of persistent data
- G06F11/1448—Management of the data involved in backup or backup restore
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/22—Indexing; Data structures therefor; Storage structures
Abstract
The invention belongs to information securities and computer application technology, and in particular to a kind of method and apparatus that MDB file fragmentation restores.This approach includes the following steps, S1, by the head feature of MDB file, obtains corresponding head file set of patches H；S2 parses MSysObjects system table data page, obtains the index for defining page of all tables；S3, head file fragment HiThe matching of fragment page, and parse different pages and obtain associated page index；S4 judges head file fragment HiIt is whether complete, step S3 is gone to if imperfect, if completely, going to step S5；S5 judges whether file is complete according to MDB file internals, if completely going to step S8, otherwise goes to step S6, S6, otherwise goes to step S8 if there is then going to step S7 with the presence or absence of the page for meeting MDB file structure from free page；The page for meeting MDB file structure is merged into head file fragment H by S7iIn, go to step S5；S8, tail portion processing, output restore file.
Description
Technical field
The invention belongs to information securities and computer application technology, and in particular to what a kind of MDB file fragmentation restored
Method and apparatus.
Background technique
The database file that Microsoft Access software generates (extends entitled Microsoft Database, referred to as
MDB), due to often doing write operation, the probability for generating fragment is quite high.Because of its convenience to data manipulation, it is commonly used in
In some modest-size programs.Discontinuously i.e. there are files when fragment, recovered there is not opening when file or
The incomplete situation of data.Traditional head-tail feature data reconstruction method is a kind of general method, the conventional method
The some internal structural informations for having ignored some MDB file formats itself, so that recovery effects are undesirable.From ACCESS's
From the point of view of application range, the fragment of MDB file, which restores research, has very big value.
The software rejuvenation process that existing fragment restores MDB file is first to find fragment all in disk, then carry out weight
Group, such method is feasible when the disk or file itself for low capacity are little, but if it is large capacity disc or
Person's file itself have very large capacity again or in disk existing fragment be more than the denotable range of container, such method does not just have
There is feasibility.
In addition, some pages for being equivalent to and only applying for space can be generated during restoring MDB file in creation, pass through
The analysis of file structure finds that the relevance of this page is weaker, increases certain difficulty for the recovery of fragment.
Summary of the invention
There is a problem of that recovery MDB file effect is undesirable for the prior art, the present invention is based on to MDB overall structure
A kind of method and apparatus that MDB file fragmentation restores are proposed on the basis of understanding in detail, this method can be in file system quilt
Destruction but file accurately find the fragment of file in the case where being uncovered and are recombinated, and utmostly recover containing broken
The MDB document of piece.
The present invention adopts the following technical scheme:
A kind of method that MDB file fragmentation restores, it includes the following steps,
S1 obtains corresponding head file set of patches H={ H by the head feature of MDB file1,H2..., Hk, k
For head file fragment sum, defining the element in head file set of patches H is Hi, i=1 or 2 ... or k, every HiPacket
File in the head is included to be believed with the file number of pages PageCount and the head file fragment parsed in page distribution map comprising page
Set P={ the P of breath1,P2..., Pt, t is the sum of page information, and defining the element in the set P of page information is Pj, j=1 or
... or t, every P 2,jIncluding page index Index, bookmark name PageFlag, the offset for defining page of page or next page
Offset TDEFPionter, the mark isFind that whether is resolved in the position Offset and page of disk of this page；
S2 parses MSysObjects system table data page, obtains the index for defining page of all tables；
S3, head file fragment HiThe matching of fragment page, and parse different pages and obtain associated page index；
S4 judges head file fragment HiIt is whether complete, step S3 is gone to if imperfect, if completely, going to step
S5；
S5 judges whether file is complete according to MDB file internals, if completely going to step S8, otherwise goes to step
Rapid S6,
Otherwise S6 is gone to the presence or absence of the page for meeting MDB file structure if there is then going to step S7 from free page
Step S8；
The page for meeting MDB file structure is merged into head file fragment H by S7iIn, go to step S5；
S8, tail portion processing, output restore file.
Further, the head feature of MDB file is Standard Jet DB in step S1.
Further, in step S2 all tables define page index ID, Pj={ Index=ID, PageFlag=
0x02, TDEFPointer=0, Offset=NULL, isFind=FALSE } include in number and the MDB file table number
Mesh is identical.
Further, head file fragment H in step S3iThe matching of fragment page is specifically: the bookmark name of fragment page
The offset TDEFPointer of either next page of the offset for defining page of PageFlag, page index Index and page, with step
The matching of rapid S2, and the fragment page is not belonging to any head file fragment, then the fragment page is added to head file fragment
HiIn.
Further, head file fragment H is judged in step S4iWhether complete method is to judge file number of pages
Whether PageCount is the value parsed in step S1.
A kind of device that MDB file fragmentation restores, it includes,
Head file set of patches acquiring unit obtains corresponding head file fragment by the head feature of MDB file
Set H={ H1,H2..., Hk, k is head file fragment sum, and defining the element in head file set of patches H is Hi, i=
... or k, every H 1 or 2,iIncluding file in the head with the file number of pages PageCount that is parsed in page distribution map and
The head file fragment includes the set P={ P of page information1,P2..., Pt, t is the sum of page information, defines the collection of page information
Closing the element in P is Pj, j=1 or 2 ... or t, every PjDefinition including page index Index, bookmark name PageFlag, page
Whether either next page of offset of offset TDEFPionter, this page of page are resolved in the position Offset and page of disk
Mark isFind；
System table data page resolution unit parses MSysObjects system table data page, obtains determining for all tables
The index of adopted page；
Matching unit, head file fragment HiThe matching of fragment page, and parse different pages and obtain associated page rope
Draw；
Complete MDB file unit is obtained, the page for meeting MDB file structure is searched from free page, and by it and arrive head
File fragmentation HiIn；
Recovery unit carries out tail portion processing to complete MDB file, and output restores file.
Further, the head feature of MDB file is Standard Jet in head file set of patches acquiring unit
DB。
Further, in system table data page resolution unit all tables define page index ID, Pj={ Index
=ID, PageFlag=0x02, TDEFPointer=0, Offset=NULL, isFind=FALSE } number and the MDB file
In comprising table number it is identical.
Further, head file fragment H in matching unitiThe matching of fragment page: the bookmark name of fragment page
The offset for defining page either next page of the offset TDEFPointer of PageFlag, page index Index and page and is
The matching for list data page resolution unit of uniting, and the fragment page is not belonging to any head file fragment, then adds the fragment page
Enter to head file fragmentation HiIn.
Further, it obtains and judges head file fragment H in complete MDB file unitiWhether complete method is judgement
Whether file number of pages PageCount is the value parsed in head file set of patches acquiring unit.
The present invention proposes what a kind of MDB document fragment restored on the basis of sufficiently having excavated MDB file structure feature
Method and apparatus are instructed the regrouping process of fragment using existing information inside MDB file structure to the full extent, had
The feature that accuracy is high, resume speed is fast.And regrouping process is not necessarily to manpower intervention, the automatic head file fragment for obtaining file
And the uniqueness of single page object ID is combined, next file fragmentation prediction is carried out, and select optimal fragment as current fragment
Next fragment, until complete restore MDB file.The present invention solve current some technologies only use head-tail feature into
There are large errors when haveing the defects that file fragmentation for row recovery.
Detailed description of the invention
Fig. 1 is the method flow diagram that MDB file fragmentation restores；
Fig. 2 is to define page to be directed toward intermediate index page schematic diagram；
Fig. 3 is to define page to be directed toward subindex page schematic diagram；
Fig. 4 original schematic diagram；
Fig. 5 is file distribution map in disk；
Fig. 6 is partial document opening figure；
Fig. 7 is signature restoration result schematic diagram；
Fig. 8 is opening prompt figure when file does not have full recovery to come out；
Fig. 9 is restoration result schematic diagram of the present invention；
Figure 10 is that the present invention restores File Open schematic diagram.
Specific embodiment
To further illustrate that each embodiment, the present invention are provided with attached drawing.These attached drawings are that the invention discloses one of content
Point, mainly to illustrate embodiment, and the associated description of specification can be cooperated to explain the operation principles of embodiment.Cooperation ginseng
These contents are examined, those of ordinary skill in the art will be understood that other possible embodiments and advantages of the present invention.In figure
Component be not necessarily to scale, and similar component symbol is conventionally used to indicate similar component.
Now in conjunction with the drawings and specific embodiments, the present invention is further described.
As shown in fig.1, the method flow diagram that the MDB file fragmentation of a present invention preferably embodiment restores,
A kind of method that MDB file fragmentation restores, it includes the following steps,
S1 obtains corresponding head file set of patches H={ H by the head feature of MDB file1,H2..., Hk, k
For head file fragment sum, defining the element in head file set of patches H is Hi, i=1 or 2 ... or k, every HiPacket
File in the head is included to be believed with the file number of pages PageCount and the head file fragment parsed in page distribution map comprising page
Set P={ the P of breath1,P2..., Pt, t is the sum of page information, and defining the element in the set P of page information is Pj, j=1 or
... or t, every P 2,jIncluding page index Index, bookmark name PageFlag, the offset for defining page of page or next page
Offset TDEFPionter, the mark isFind that whether is resolved in the position Offset and page of disk of this page.
Search for the head feature " Standard Jet DB " of MDB file totally as unit of sector, this feature usually exists
The starting position of sector.It is special according to MDB file structure after the sector behind sector where finding MDB top of file feature
Type is levied, page matching is carried out, head file fragment is obtained and occupies several pages, form a new head file fragment HiIt is added
In head file set of patches.
Wherein, the lookup algorithm and rule of different fragments:
1. head file fragment HiHead file fragment and some pages of PjInitialization merge algorithm: by object fragment and
The information (bookmark name and index value) for parsing other obtained pages merges the specific algorithm for forming a new head file fragment
Are as follows:
2. form definition page expansion algorithm parses MSysObjects, all n tables that will include in MSysObjects
It defines page and expands, and be added to head file fragment HiIn:
Hi=Extent1 (Hi,n)
Wherein:
Nn is the number of form definition page in MSysObjects, needs and is obtained by the index page of MSysObjects；
PjIn IndexjAnd obtained by the index page of MSysObjects, because of in store all tables in the system table
ID (index of form definition page), so PageFlagjFor fixed value 0x02.
3. parsing, which defines page, extends index page algorithm: parsing form definition page obtains corresponding index page and is added to corresponding
Head file fragment in,
Hi=Extent2 (Hi,m2)
Wherein, m2 is the index page number that form definition page is resolved to.By information in parsing form definition page, can obtain
Column to table define information: the type TYPE of column, train value deviation post Offset_v/Offset_F in record, column
Name colName etc.；
PjThe index page index that page obtains is defined for parsing, but the type of the index page is had no idea in defining page
Determining, it is likely to be obtained intermediate index page (signature: 0x03) or leaf index page group (signature: 0x04).
If define page direction is intermediate index page, subindex page group is parsed by intermediate index page, subindex page can
To be directed toward previous index page (prev_index_page) and next index page (next_index_page), as shown in Figure 2.
If define that page is directed toward is subindex page group, the index value of index page only can be parsed out, between index page
It is contacted without front and back, that is to say, that there is no prev_index_page and next_index_page, as shown in Figure 3.
4. parsing subindex page growth data page algorithm: parsing index page obtains corresponding data page and is added to corresponding
In head file fragment,
Hi=Extent3 (Hi,m3)
Wherein, m3 is the data page number that index page is resolved to, and finds the table by parsing subindex page Bitmap
All data pages index.
5. parsing data page extension overflow page and remarks/long text page algorithm: parsing data page obtains corresponding extension and overflows
Page and remarks/long text page are added in corresponding head file fragment out,
Hi=Extent4 (Hi,m4)
Wherein, m4 is the extension overflow page being resolved to from data page and remarks/long text page number.Overflow page is theoretically
It is that can be obtained by the index page of parsing direction definition page；
Remarks/long text page (LVAL pages) has 3 types: the supplement of long text data content, LVAL pages individual, n
LVAL pages of group.The parsing organized for LVAL pages needs to parse next_LVAL_page.
Because MDB file itself is that no tail portion is signed, additionally due to MDB file can automatic Shen during generation
Please some spaces page (not having data, contact without front and back), so there is certain difficulty in the tail portion of resolution file.The present invention in order to
So that file is more complete, certain MDB pages of selection extension.
S2 parses MSysObjects system table data page, obtains the index for defining page of all tables.
Parsing obtains the index (i.e. ID) for defining page of all tables, i.e. Pj=Index=ID, PageFlag=0x02,
TDEFPointer=0, Offset=NULL, isFind=FALSE } include in number and the MDB file table number phase
Together.
S3, head file fragment HiThe matching of fragment page, and parse different pages and obtain associated page index.
Head file fragment HiThe matching of fragment page is specifically: the bookmark name PageFlag of fragment page, page index Index with
And the offset TDEFPointer of either next page of the offset for defining page of page, the matching with step S2, and the fragment page is not
Belong to any head file fragment, then the fragment page is added to head file fragment HiIn.
S4 judges head file fragment HiIt is whether complete, step S3 is gone to if imperfect, if completely, going to step
S5。
Step S1 parsing obtains corresponding head file set of patches H, each element H in set HiFile number of pages
PageCount has also been obtained.Step S4 judges head file fragment HiWhether complete method, as judge that head file is broken
Piece HiFile number of pages PageCount whether be the value parsed in step S1.
The occupied page of above step processing, is also possible to that there are MDB files, so if MDB is literary in free page
Part internal structure is complete, then directly restores file；If MDB file internals are imperfect, go in free page to search whether
In the presence of the page for meeting MDB file structure, exist, is merged into head file fragment HiIn.
S5 judges whether file is complete according to MDB file internals, if completely going to step S8, otherwise goes to step
Rapid S6,
Otherwise S6 is gone to the presence or absence of the page for meeting MDB file structure if there is then going to step S7 from free page
Step S8；
The page for meeting MDB file structure is merged into head file fragment H by S7iIn, go to step S5；
S8, tail portion processing, output restore file.
In order to verify the correctness of method proposed by the invention, it is extensive that MDB file fragmentation is verified in win764 systems
Multiple effect.As shown in fig.4, being original schematic diagram；Fig. 5 is file distribution map in disk；Fig. 6 is that partial document is opened
Figure.
Existing method restores MDB file, as shown in fig.7, for signature restoration result schematic diagram.As seen from Figure 7, file does not have
There is full recovery to come out, Fig. 8 is opening prompt figure when file does not have full recovery to come out.
As shown in fig.9, being restoration result schematic diagram of the present invention；Figure 10 is that the present invention restores File Open schematic diagram.By
Fig. 9 and Figure 10 can be restored MDB file fragmentation it is found that using method proposed by the present invention.
The invention also provides the devices that a kind of MDB file fragmentation restores, it includes,
Head file set of patches acquiring unit obtains corresponding head file fragment by the head feature of MDB file
Set H={ H1,H2..., Hk, k is head file fragment sum, and defining the element in head file set of patches H is Hi, i=
... or k, every H 1 or 2,iIncluding file in the head with the file number of pages PageCount that is parsed in page distribution map and
The head file fragment includes the set P={ P of page information1,P2..., Pt, t is the sum of page information, defines the collection of page information
Closing the element in P is Pj, j=1 or 2 ... or t, every PjDefinition including page index Index, bookmark name PageFlag, page
Whether either next page of offset of offset TDEFPionter, this page of page are resolved in the position Offset and page of disk
Mark isFind；
System table data page resolution unit parses MSysObjects system table data page, obtains determining for all tables
The index of adopted page；
Matching unit, head file fragment HiThe matching of fragment page, and parse different pages and obtain associated page rope
Draw；
Complete MDB file unit is obtained, the page for meeting MDB file structure is searched from free page, and by it and arrive head
File fragmentation HiIn；
Recovery unit carries out tail portion processing to complete MDB file, and output restores file.
In addition, the head feature of MDB file is Standard Jet DB in head file set of patches acquiring unit.System
The index ID, P for defining page of all tables in list data page resolution unit of unitingj=Index=ID, PageFlag=0x02,
TDEFPointer=0, Offset=NULL, isFind=FALSE } include in number and the MDB file table number phase
Together.
It should be noted that in matching unit file Hi fragment page matching: bookmark name PageFlag, the page rope of fragment page
The offset TDEFPointer for drawing either next page of the offset for defining page of Index and page, with system table data page solution
The matching of unit is analysed, and the fragment page is not belonging to any head file fragment, then it is broken the fragment page to be added to head file
Piece HiIn.
It obtains and judges head file fragment H in complete MDB file unitiWhether complete method is to judge file number of pages
Whether PageCount is the value parsed in head file set of patches acquiring unit.
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
It is white, it is not departing from the spirit and scope of the present invention defined by the appended claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (10)
1. a kind of method that MDB file fragmentation restores, it is characterised in that: it includes the following steps,
S1 obtains corresponding head file set of patches H={ H by the head feature of MDB file1,H2..., Hk, k is head
Portion's file fragmentation sum, defining the element in head file set of patches H is Hi, i=1 or 2 ... or k, every HiIncluding this
File includes page information with the file number of pages PageCount and the head file fragment parsed in page distribution map in head
Set P={ P1,P2..., Pt, t is the sum of page information, and defining the element in the set P of page information is Pj, j=1 or
... or t, every P 2,jIncluding page index Index, bookmark name PageFlag, the offset for defining page of page or next page
Offset TDEFPionter, the mark isFind that whether is resolved in the position Offset and page of disk of this page；
S2 parses MSysObjects system table data page, obtains the index for defining page of all tables；
S3, head file fragment HiThe matching of fragment page, and parse different pages and obtain associated page index；Head file
Fragment HiThe matching of fragment page is specifically: bookmark name PageFlag, the page of fragment page index the inclined of the definition page of Index and page
It moves either next page of offset TDEFPointer, the matching with step S2, and the fragment page and is not belonging to any head text
The fragment page is then added to head file fragment H by part fragmentiIn；
S4 judges head file fragment HiIt is whether complete, step S3 is gone to if imperfect, if completely, going to step S5；
S5 judges whether file is complete according to MDB file internals, if completely going to step S8, otherwise goes to step S6,
Otherwise S6 goes to step if there is then going to step S7 with the presence or absence of the page for meeting MDB file structure from free page
S8；
The page for meeting MDB file structure is merged into head file fragment H by S7iIn, go to step S5；
S8, tail portion processing, output restore file.
2. the method that MDB file fragmentation as described in claim 1 restores, it is characterised in that: MDB file in the step S1
Head feature is Standard Jet DB.
3. the method that MDB file fragmentation as described in claim 1 restores, it is characterised in that: all tables in the step S2
Define page index ID, Pj=Index=ID, PageFlag=0x02, TDEFPointer=0, Offset=NULL,
IsFind=FALSE } number in the MDB file include the number of table it is identical.
4. the method that MDB file fragmentation as claimed in claim 3 restores, it is characterised in that: head file in the step S3
Fragment HiThe matching of fragment page is specifically: bookmark name PageFlag, the page of fragment page index the inclined of the definition page of Index and page
It moves either next page of offset TDEFPointer, the matching with step S2, and the fragment page and is not belonging to any head text
The fragment page is then added to head file fragment H by part fragmentiIn.
5. the method that MDB file fragmentation as described in claim 1 restores, it is characterised in that: judge head in the step S4
File fragmentation HiWhether complete method are as follows: judge whether file number of pages PageCount is the value parsed in step S1.
6. the device that a kind of MDB file fragmentation restores, it is characterised in that: it includes,
Head file set of patches acquiring unit obtains corresponding head file set of patches by the head feature of MDB file
H={ H1,H2..., Hk, k is head file fragment sum, and defining the element in head file set of patches H is Hi, i=1 or
... or k, every H 2,iIncluding file in the head with the file number of pages PageCount and the head parsed in page distribution map
Portion's file fragmentation includes the set P={ P of page information1,P2..., Pt, t is the sum of page information, is defined in the set P of page information
Element be Pj, j=1 or 2 ... or t, every PjPage is defined including page index Index, bookmark name PageFlag, page
The mark whether offset or next page of offset TDEFPionter, this page are resolved in the position Offset and page of disk
Know isFind；
System table data page resolution unit parses MSysObjects system table data page, obtains the definition page of all tables
Index；
Matching unit, head file fragment HiThe matching of fragment page, and parse different pages and obtain associated page index；Head
Portion file fragmentation HiThe matching of fragment page is specifically: the definition of the bookmark name PageFlag, page index Index and page of fragment page
Either next page of offset of offset TDEFPointer of page, the matching with step S2, and the fragment page are not belonging to any
The fragment page is then added to head file fragment H by head file fragmentiIn；
Complete MDB file unit is obtained, the page for meeting MDB file structure is searched from free page, and by it and arrive head file
Fragment HiIn；
Recovery unit carries out tail portion processing to complete MDB file, and output restores file.
7. the device that MDB file fragmentation as claimed in claim 6 restores, it is characterised in that: the head file set of patches
The head feature of MDB file is Standard Jet DB in acquiring unit.
8. the device that MDB file fragmentation as claimed in claim 6 restores, it is characterised in that: the system table data page solution
Analyse the index ID, P for defining page of all tables in unitj={ Index=ID, PageFlag=0x02, TDEFPointer=
0, Offset=NULL, isFind=FALSE } number in the MDB file include the number of table it is identical.
9. the device that MDB file fragmentation as claimed in claim 8 restores, it is characterised in that: file H in the matching unitiIt is broken
The matching of piece page is specifically: the offset for defining page of bookmark name PageFlag, the page index Index and page of fragment page are either
Next page of offset TDEFPointer, the matching with system table data page resolution unit, and the fragment page are not belonging to any
Head file fragment, then the fragment page is added to head file fragment HiIn.
10. the device that MDB file fragmentation as claimed in claim 6 restores, it is characterised in that: described to obtain complete MDB file
Head file fragment H is judged in unitiWhether complete method is to judge whether file number of pages PageCount is that head file is broken
The value parsed in piece set acquiring unit.
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| CN108563751A (en) * | 2018-04-16 | 2018-09-21 | 中国刑事警察学院 | Database fragment extracting method |
| CN113254263A (en) * | 2020-02-13 | 2021-08-13 | 青岛海信移动通信技术股份有限公司 | Electronic terminal and file recovery method |
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| CN103645974B (en) * | 2013-12-31 | 2017-02-08 | 厦门市美亚柏科信息股份有限公司 | Method and device for recovering portable document format (PDF) file |
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