Office software is closely linked to the PDF,the PDF is also must have to control!
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2 PDF of the structure 2.1 PDF File Structure PDF file structure (that is, physical structure) includes four parts: the first document, the document body, cross-reference table and file tail, see Figure 1. Documents specified in the first document to comply with the PDF specification version number, which appears in the first line of PDF documents. % PDF-1.2, such as that the file format in line with the norms of PDF1.2. Document body by a series of PDF indirect object (inDirectob Ject) component. These constitute the indirect object of the specific content of PDF files such as fonts, pages, images and so on. Cross-reference table is an indirect object in order to be able to set up random access to the target address of an indirect index table. Document the end of the statement of the cross-reference table of the address, specified document root body object (catalong), also preserves the security of information encryption. According to information provided by the end of document, PDF applications can find cross-reference table and the entire PDF document's root object, and thus control the entire PDF document.   |
