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A method for identifying, sorting and reorganizing office file data fragments

A file data and data fragmentation technology, applied in the field of data processing, can solve problems such as prompting errors and files that cannot be displayed normally

Active Publication Date: 2021-07-13
CHINA CRIMINAL POLICE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you double-click to open a new file at this time, an error will usually be prompted, and some fatal errors (such as damaged document.xml) will cause the file to not be displayed normally, and such recognition errors need to be corrected

Method used

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  • A method for identifying, sorting and reorganizing office file data fragments
  • A method for identifying, sorting and reorganizing office file data fragments
  • A method for identifying, sorting and reorganizing office file data fragments

Examples

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Embodiment Construction

[0048] Below to figure 1 As an example, the methods for identifying, sorting, and reorganizing Office data fragments are illustrated with examples. Figure 4 -b is the end record of the directory located according to the flag bit 0x504B0506, this record is located in figure 1 Fragment 6 in , the record length is 0x14 bytes. According to the end record of the directory, there are 0x1A directory entries in the directory area, the size is 0x06B2 bytes, and the offset address in the Office file is 0x0447CEA3. From the above values, the total size of the Office file can be calculated = 0x0447CEA3 + 0x06B2 + 0x14, which is 0x447D569 bytes. Create a new empty file with a size of 0x447D569 bytes, which will be used to store the data content of the recovered Office file.

[0049] Such as Figure 4 As shown by -b, the end address of the directory area in the disk is 0x079EF9568. Since the directory has not been fragmented, the starting address of the directory can be calculated as 0...

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Abstract

A method for identifying, sorting, and reorganizing Office file data slices belongs to the technical field of data processing, and in particular relates to a method for identifying, sorting, and reorganizing Office file data slices. The invention provides a method for identifying, sorting and reorganizing Office file data slices. The present invention comprises the following steps: Step 1: In the free space of the disk, identify all Office data fragments; Step 2: In all Office fragments, according to the 0X 50 4B 05 06 flag bit, search for the end record containing the Office file tail directory Let the total number of such fragments be t, that is, the total number of Office files to be restored is t; set the initial value of the integer variable i to 0; Step 3: Locate the i-th Office file directory item according to All data blocks of the i file; step 4: reorganize the i th Office file.

Description

technical field [0001] The invention belongs to the technical field of data processing, and in particular relates to a method for identifying, sorting and reorganizing Office file data slices. Background technique [0002] Office software is widely used in various fields, and a large amount of valuable data information is stored in Office files. In order to evade legal sanctions, criminals will delete the Office files that store the information involved in the case, or even directly format the storage device. Restoring these deleted Office documents involved in the case is of great significance to the investigation and evidence collection work of the public security organs. [0003] During the editing process of Office files, the file data stored on the disk is prone to fragmentation, that is, the file content is divided into multiple segments and stored in several non-contiguous storage areas. figure 1 It shows that an Office file is divided into 6 slices, which are store...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F16/14G06F16/16
CPCG06F16/148G06F16/16
Inventor 徐国天
Owner CHINA CRIMINAL POLICE UNIV