/podofomemo

reading source code of podofo

Primary LanguageC++

PoDoFo SRC Analysis

Overview

Resources:

Structure of the library

podofo architecture

  • /podofo/src/base (fundation lib)
  • /podofo/src/doc (high level lib)

Build Notice

need to install prerequisite

  1. From ./podofo/README.html:
sudo aptitude install build-essential g++ cmake libz-dev libtiff-dev \
		 libjpeg-dev libfreetype6-dev libfontconfig-dev

  1. Before that you need : sudo apt-get install appitude sudo apt-get install libcppunit-dev

  2. Then other packages: from compile infoes,note that libcrypto have some problems: sudo apt-cache search libcrypto you will get multiple matched packages try to install them one by one!

  3. check the compile info to find out what can not found install neccesory packages

  4. install libpng sudo apt-cache search libpng find matched packages and install ...

Interface TIPS

./tools/
├── CMakeLists.txt
├── podofobox/
├── podofocolor/
├── podofocountpages/          (count PDF file pages)
├── podofocrop/
├── podofoencrypt/
├── podofogc/
├── podofoimg2pdf/             (input image generate correspongding PDF file)
├── podofoimgextract/          (extract all images from a PDF file)
├── podofoimpose/
├── podofoincrementalupdates/
├── podofomerge/
├── podofopages/               (delete Page, and move Page position)
├── podofopdfinfo/
├── podofotxt2pdf/
├── podofotxtextract/
├── podofouncompress/
├── podofoxmp/
└── tools

17 directories, 2 files

Source code TIPS

 Using PoDoFo in Your Application

 A simple example that uses PoDoFo can be found in examples/helloworld . 
 You will also find the tests and tools shipped with PoDoFo informative when 
 learning to use the library. Reading the documentation on PdfMemDocument, 
 PdfStreamedDocument, PdfObject and PdfVariant may also be useful.

Read following documents first maybe useful:

Done list

 class PdfDocument;
 class PdfVariant;
 class PdfObject;
 Class PdfStream;
 class PdfVecObjects;

 class PdfDataType
 class PdfData
 class PdfName
 class PdfString

Syntax

White-space

NOTE:

  • White-space characters separate syntactic constructs.
  • All white-space characters are equivalent, except in comments/strings/streams.
  • PDF treats any sequence of consecutive white-space characters as one.

White-space table

Comments

  1. Comments will be parsed as White-space characters.

  2. Anything between %(the percent sing) and the end of the line are treated as comments, except below two:

  • %PDF-n.m : descript pdf parser version, implicitly imply the start of file
  • %%EOF : descript fire structure, End Of File
  • %number after %PDF-n.m line, if number > 128 indicate this pdf contain binary contents

Objects

PDF support 8 basic types of objects:(COS)

  • Boolean values : int the file as the text true or false
  • Interger and real numbers
    • Interger : in the files as a number without a decimal point
    • Real Number : in the file as a number with a decimal point
  • Strings
    • Literal strings : in parentheses like (feilunzhou )
    • Hexadecimal strings : in angle brackets <8A9F3D9C99AD>
  • Names : form as /text, slash followed by some text, no white-space or punctuation allowed
  • Arrays : form as [...other objects...]
  • Dictionaries : form as <<...other objects...>>
  • Streams : form as 20 0 obj<<...stream attribute objs...>>stream ...binarydata...endstream
  • The null object

The first 5 are single value types, and the next 3 are container types!