Method and device for recovering portable document format (PDF) file
A file recovery and file technology, applied in the direction of responding to errors, special data processing applications, instruments, etc., can solve problems such as loss, garbled content, and inability to open files, so as to improve the recovery effect and facilitate use.
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[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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