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A method and device for recovering pdf files

A file recovery and file technology, applied in response to error generation, special data processing applications, instruments, etc., can solve problems such as loss, garbled content, and poor results, so as to improve the effect of recovery and facilitate use

Active Publication Date: 2017-02-08
XIAMEN MEIYA PICO INFORMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the structural characteristics of PDF files, the recovery effect is not very good when using the recovery software in the prior art, and the recovered files often cannot be opened, garbled characters or content is lost.

Method used

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  • A method and device for recovering pdf files
  • A method and device for recovering pdf files
  • A method and device for recovering pdf files

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Embodiment Construction

[0054] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0055] In order to facilitate the introduction in the present invention, at first the file structure of the PDF file is described:

[0056] A PDF file is mainly composed of four parts: file header, object collection, cross-reference table, and file tail. Among them, the file header mainly records the version number of the PDF specification that the file complies with; the object collection is the main part of the PDF file, consisting of a series of objects; the cross-reference table is an address index table of indirect objects, mainly In order to be able to perform random access to indirect objects; the address of the cross-reference table is declared at the end of the file, that is, the root object of the object collection is specifi...

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Abstract

The invention provides a method and a device for recovering a portable document format (PDF) file. The method comprises the following steps: searching a file header fragment and an end-of-file fragment on storage medium according to a file header feature markup and an end-of-file feature markup; searching the end-of-file fragment matched with information in the file header fragment according to the information in the file header fragment and the information in the end-of-file fragment; taking the matched file header fragment and end-of-file fragment as complete fragments of a to-be-recovered file, so as to recover the to-be-recovered file according to the complete fragments. Structure characteristics of the PDF file can be combined by using the method, correct recovery of the PDF file is achieved, the recovery effect is improved, and use of a user is facilitated.

Description

technical field [0001] The invention relates to the technical field of electronic file reading and writing, in particular to a PDF file recovery method and device. Background technique [0002] As a widely used editing file format, PDF files have been used by a large number of users in computers and the Internet. The full name of PDF is Portable Document Format, translated as "Portable Document Format", which is an electronic file format. This format has nothing to do with the operating system platform, and it is this unique performance that makes it an ideal document format for electronic document distribution and digital information dissemination on the Internet. More and more e-books, product descriptions, company announcements, network materials, and e-mails start to use PDF format files. [0003] At the same time, as people use more and more PDF files, problems related to the use of PDF files will follow. For example: when people operate computers on a daily basis, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/14G06F17/30
Inventor 沈长达钱镜洁林艺滨
Owner XIAMEN MEIYA PICO INFORMATION
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