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net
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: Application Layer
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net2o app layer
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\begin_layout Subtitle
Browser Components
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\begin_layout Author
Bernd Paysan
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EuroForth 2013, Hamburg
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~~~}}}
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Overview
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\begin_layout Section
Motivation
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Purpose?
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People want to share information 
\emph on
(share
\emph default
 means 
\emph on
copy)
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\begin_layout Pause

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Texts, photos, videos, music
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longer, structured documents
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\begin_deeper
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Real--time media (chat, videos, video conferences)
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collaborative gaming
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Things I want to show
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In 2011 I did a presentation with the same title --- back then, this was
 complete vaporware: the plan.
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Now there are components which need to be put together
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and there's a concept how to do that
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needs to work on PCs and mobile platforms like Android, which are sometimes
 
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a bit strange
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.
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\begin_layout Section
Sidetracking: What Changed Due to Snowden?
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Sidetracking: Impact of Snowden Leaks
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Encryption now uses Keccak (SHA--3) as primitive.
 Universal crypto primitive, faster than Wurstkessel at same level of security,
 chosen in an open competition.
 
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\begin_deeper
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ECDHE for connection setup in a way that doesn't reveal identities (metadata!)
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Made sure the random numbers use entropy of the system, but not directly
 system random numbers
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Secure internet more important than ever!
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Requirements
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Formats and IO
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How to display things
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Why OpenGL?
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OpenGL can do everything
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OpenGL renders:
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Triangles, lines, points --- simple components
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Textures and gradients
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and uses shader programs --- the most powerful thing in OpenGL from 2.0.
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Real requirement: visualization of 
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 OpenGL can do that.
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How to connect the media?
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Lemma: every glue logic will become Turing complete
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currently used glue: HTML+CSS+JavaScript
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containers with Flash, Java, ActiveX, PDF, Google's NaCl\SpecialChar \ldots{}

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conclusion: use a powerful tool right from start!
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browser: run--time and development tool for applications
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Security
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Lemma: every sufficiently complex format can be exploited
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Java's approach to secure the language from the inside can be seen as a
 failure.
 Java is now malware entry door number 1.
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{Sandbox}
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sandbox the process that interprets network apps
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funnel network connections through a proxy --- a shared memory module for
 net2o is missing
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encryption (key access!) outside the sandbox
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--policies don't work in a P2P cloud
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A Few Demos
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Approach and Problems
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libSOIL: Simple API to load images
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libjpeg and libpng have a very complcated AP
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Other option: libSOIL:
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Videos
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Onion--Programming
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Looks big from the outside
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Onion--Programming
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Use of martial tools recommended
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Onion--Programming
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Onion 
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all the way down
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Videos
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OpenMAX AL
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Android uses OpenMAX AL as video framework --- similar to gstreamer, but
 slightly different\SpecialChar \ldots{}

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renders video into a texture, but can also record videos from the camera
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input: MPEG transport stream
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C++--like C API (vtable implemented as function pointer struct)
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only half--hearted implemented, needs Java via JNI, can't handle resizes
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four languages for video player: Forth, C, Java, OpenGL shader language
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get timestamp
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MTS? All videos today are MKV!
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Matroska
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 sounds like onion programming, too\SpecialChar \ldots{}

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Container --- what for?
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Usual explanation: several files too difficult to handle.
 IMHO, directories with multiple files are better than containers.
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Videos and audio stored as single frames and short packets
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Timestamps for synchronized playback
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Index for random access
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Matroska interpreter
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Binary XML format
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Matroska parser uses a hash table for the tags
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each tag has an associated Mini OOF2 method
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different classes for different purposes: dump for inspection, MTS converter
 class
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Text
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Fonts rendering
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Freetype--GL renders OpenType fonts into OpenGL--Textures
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OpenType is state of the art
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we render textures, so the vector font needs to go into a texture
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FreeType--GL uses a texture as glyph cache
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1 glyph: 2 triangles
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这是一个文本:我爱彭秀清。
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( -- )
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  hidekb
\end_layout

\begin_layout LyX-Code
    
\color red
1
\color inherit
 level# +!  
\color yellow
BEGIN
\end_layout

\begin_layout LyX-Code
        <render
\end_layout

\begin_layout LyX-Code
        
\color red
0.

\color inherit
 penxy 2!
\end_layout

\begin_layout LyX-Code
        font1 to font  text1$ $@ render-string
\end_layout

\begin_layout LyX-Code
        
\color red
-100e
\color inherit
 penxy sf! 
\color red
-60e
\color inherit
 penxy sfloat+ sf!
\end_layout

\begin_layout LyX-Code
        font2 to font  text2$ $@ render-string
\end_layout

\begin_layout LyX-Code
        render>
\end_layout

\begin_layout LyX-Code
        sync >looper
\end_layout

\begin_layout LyX-Code
    level# @ 0= 
\color yellow
UNTIL
\color inherit
 
\color cyan
;
\end_layout

\end_deeper
\begin_layout EndFrame

\end_layout

\begin_layout Section
Outlook
\end_layout

\begin_layout BeginFrame
Outlook
\end_layout

\begin_layout FrameSubtitle
This presentation has been rendered with LaTeX Beamer\SpecialChar \ldots{}

\end_layout

\begin_layout Itemize
The next presentation should be rendered with MINOΣ2
\end_layout

\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
Texts, videos, and images should be get with net2o, shouldn't be on the
 device
\end_layout

\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
Typesetting engine with boxes and glues, line breaking and hyphenation missing
\end_layout

\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
a lot less classes than MINOΣ --- but more objects
\end_layout

\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
add a zbox for vertical layering
\end_layout

\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
integrate animations
\end_layout

\begin_deeper
\begin_layout Pause

\end_layout

\end_deeper
\begin_layout Itemize
combine the GLSL programs into one program?
\end_layout

\begin_layout EndFrame

\end_layout

\begin_layout Section*
\start_of_appendix
Appendix
\end_layout

\begin_layout Subsection*
Literature&Links
\end_layout

\begin_layout BeginFrame
Literature&Links
\end_layout

\begin_layout Bibliography
\labelwidthstring Literaturverzeichnis
\begin_inset CommandInset bibitem
LatexCommand bibitem
key "net2o"

\end_inset


\noun on
Bernd Paysan
\noun default
 
\begin_inset ERT
status collapsed

\begin_layout Plain Layout


\backslash
newblock
\end_layout

\end_inset


\emph on
\color white
net2o fossil repository
\emph default
\color inherit

\begin_inset ERT
status collapsed

\begin_layout Plain Layout


\backslash
newblock
\end_layout

\end_inset

 
\begin_inset Flex URL
status open

\begin_layout Plain Layout
http://fossil.net2o.de/net2o/
\end_layout

\end_inset


\end_layout

\begin_layout Bibliography
\labelwidthstring Literaturverzeichnis

\noun on
\begin_inset CommandInset bibitem
LatexCommand bibitem
key "minos2"

\end_inset

Bernd Paysan
\noun default
 
\begin_inset ERT
status collapsed

\begin_layout Plain Layout


\backslash
newblock
\end_layout

\end_inset


\emph on
\color white
minos2 fossil repository
\emph default
\color inherit

\begin_inset ERT
status collapsed

\begin_layout Plain Layout


\backslash
newblock
\end_layout

\end_inset

 
\begin_inset Flex URL
status open

\begin_layout Plain Layout
http://fossil.net2o.de/minos2/
\end_layout

\end_inset


\end_layout

\begin_layout EndFrame

\end_layout

\end_body
\end_document