PDF
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PDF

Ref

  1. Introduction to PDF
  2. Fillable PDF

Intro

  • Portable Format Document
  • A format meant to be displayed identicaly in all platforms and media

Simple Example

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%PDF-1.7

1 0 obj  % entry point
<<
  /Type /Catalog
  /Pages 2 0 R
>>
endobj

2 0 obj
<<
  /Type /Pages
  /MediaBox [ 0 0 200 200 ]
  /Count 1
  /Kids [ 3 0 R ]
>>
endobj

3 0 obj
<<
  /Type /Page
  /Parent 2 0 R
  /Resources <<
    /Font <<
      /F1 4 0 R 
    >>
  >>
  /Contents 5 0 R
>>
endobj

4 0 obj
<<
  /Type /Font
  /Subtype /Type1
  /BaseFont /Times-Roman
>>
endobj

5 0 obj  % page content
<<
  /Length 44
>>
stream
BT
70 50 TD
/F1 12 Tf
(Hello, world!) Tj
ET
endstream
endobj

xref
0 6
0000000000 65535 f 
0000000010 00000 n 
0000000079 00000 n 
0000000173 00000 n 
0000000301 00000 n 
0000000380 00000 n 
trailer
<<
  /Size 6
  /Root 1 0 R
>>
startxref
492
%%EOF

Structure

Typically, a PDF contains 4 parts:

  1. The header, with PDF version(and an option line to specify if the PDF contains binary data)
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%PDF-1.7
  1. The body, containing a series of objects
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1 0 obj
...
endobj
2 0 obj
...
endobj
...
  1. A cross-reference table that specifies the position of the bojects
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xref
0 6
0000000000 65535 f 
0000000010 00000 n 
0000000079 00000 n 
0000000173 00000 n 
0000000301 00000 n 
0000000380 00000 n
  1. A trailer, with information about where the document starts
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trailer
<<
  /Size 6
  /Root 1 0 R
>>
startxref
492
%%EOF

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PDF

https://blog-cdt1.vercel.app/2022/11/24/PDF/

Author

Chendongtian

Posted on

2022-11-24

Updated on

2023-08-04

Licensed under

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