Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Parsing Binary Data
Search
Jan Krutisch
June 29, 2012
Programming
0
240
Parsing Binary Data
A lighting talk about parsing binary data in ruby with bindata gem.
Jan Krutisch
June 29, 2012
Tweet
Share
More Decks by Jan Krutisch
See All by Jan Krutisch
Decentralize ALL THE THINGS - Eurucamp 2014
halfbyte
3
260
Decentralise ALL THE THINGS
halfbyte
0
200
Railsgirls - Coaches dinner introduction
halfbyte
0
69
SSL Deployment Best Practices
halfbyte
0
510
Metaphors are like knives. You can use them to cut yourself and if you throw rocks at them, they fall apart
halfbyte
0
1.7k
Livecoding Music and Graphics in the browser
halfbyte
0
310
Geeks and Music
halfbyte
0
210
JSON - Schmason
halfbyte
0
270
Javascript Audio APIs - Let's make some noise
halfbyte
0
170
Other Decks in Programming
See All in Programming
ネイティブ製ガントチャートUIを作って学ぶUICollectionViewLayoutの威力
jrsaruo
0
140
私達はmodernize packageに夢を見るか feat. go/analysis, go/ast / Go Conference 2025
kaorumuta
2
500
CSC509 Lecture 05
javiergs
PRO
0
300
After go func(): Goroutines Through a Beginner’s Eye
97vaibhav
0
240
Your Perfect Project Setup for Angular @BASTA! 2025 in Mainz
manfredsteyer
PRO
0
140
CSC509 Lecture 06
javiergs
PRO
0
250
Model Pollution
hschwentner
1
190
クラシルを支える技術と組織
rakutek
0
190
非同期jobをtransaction内で 呼ぶなよ!絶対に呼ぶなよ!
alstrocrack
0
560
Playwrightはどのようにクロスブラウザをサポートしているのか
yotahada3
7
2.3k
なぜあの開発者はDevRelに伴走し続けるのか / Why Does That Developer Keep Running Alongside DevRel?
nrslib
3
380
LLMとPlaywright/reg-suitを活用した jQueryリファクタリングの実際
kinocoboy2
4
680
Featured
See All Featured
The MySQL Ecosystem @ GitHub 2015
samlambert
251
13k
A designer walks into a library…
pauljervisheath
209
24k
The Cost Of JavaScript in 2023
addyosmani
53
9k
Principles of Awesome APIs and How to Build Them.
keavy
127
17k
How to train your dragon (web standard)
notwaldorf
96
6.3k
Designing Experiences People Love
moore
142
24k
No one is an island. Learnings from fostering a developers community.
thoeni
21
3.5k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
234
17k
4 Signs Your Business is Dying
shpigford
185
22k
CSS Pre-Processors: Stylus, Less & Sass
bermonpainter
358
30k
Designing Dashboards & Data Visualisations in Web Apps
destraynor
231
53k
A Modern Web Designer's Workflow
chriscoyier
697
190k
Transcript
Parsing and Writing Binary Data in Ruby Jan Krutisch @halfbyte
[email protected]
señor developer
None
Protracker "mod" files
Binary Format
None
‣ Instrument Metadata ‣ Sample Data ‣ Pattern Data ‣
Sequence Data Mod File Contents
‣ Instrument Metadata ‣ Sample Data ‣ Pattern Data ‣
Sequence Data Mod File Contents Array of Structs (=Array of Hashes)
‣ Instrument Metadata ‣ Sample Data ‣ Pattern Data ‣
Sequence Data Mod File Contents Array of Structs (=Array of Hashes) Array of Blobs
‣ Instrument Metadata ‣ Sample Data ‣ Pattern Data ‣
Sequence Data Mod File Contents Array of Structs (=Array of Hashes) Array of Blobs Arrays of Arrays of Arrays of Structs
‣ Instrument Metadata ‣ Sample Data ‣ Pattern Data ‣
Sequence Data Mod File Contents Array of Structs (=Array of Hashes) Array of Blobs Arrays of Arrays of Arrays of Structs Array of Integers
Simple Approach
Serializer / Deserializer
Different Datatypes
Protracker Datatypes
Protracker Datatypes ‣ 8Bit signed binary blobs
Protracker Datatypes ‣ 8Bit signed binary blobs ‣ UInt8
Protracker Datatypes ‣ 8Bit signed binary blobs ‣ UInt8 ‣
UInt16 (Endianness?)
Protracker Datatypes ‣ 8Bit signed binary blobs ‣ UInt8 ‣
UInt16 (Endianness?) ‣ \0-Terminated/Padded Strings
Protracker Datatypes ‣ 8Bit signed binary blobs ‣ UInt8 ‣
UInt16 (Endianness?) ‣ \0-Terminated/Padded Strings ‣ Int4 (Yes, that‘s a signed halfbyte)
And this...
None
Procedural Mess
Declarative
gem "bindata"
class ProtrackerModule < BinData::Record endian :big string :name, :length =>
20, :trim_padding => true array :samples, :type => Sample, :length => 31 uint8 :pattern_table_length uint8 :unused array :pattern_table, :type => :uint8, :initial_length => 128 [...]
class ProtrackerModule < BinData::Record endian :big string :name, :length =>
20, :trim_padding => true array :samples, :type => Sample, :length => 31 uint8 :pattern_table_length uint8 :unused array :pattern_table, :type => :uint8, :initial_length => 128 [...]
class ProtrackerModule < BinData::Record endian :big string :name, :length =>
20, :trim_padding => true array :samples, :type => Sample, :length => 31 uint8 :pattern_table_length uint8 :unused array :pattern_table, :type => :uint8, :initial_length => 128 [...]
class ProtrackerModule < BinData::Record endian :big string :name, :length =>
20, :trim_padding => true array :samples, :type => Sample, :length => 31 uint8 :pattern_table_length uint8 :unused array :pattern_table, :type => :uint8, :initial_length => 128 [...]
class ProtrackerModule < BinData::Record endian :big string :name, :length =>
20, :trim_padding => true array :samples, :type => Sample, :length => 31 uint8 :pattern_table_length uint8 :unused array :pattern_table, :type => :uint8, :initial_length => 128 [...]
array :patterns, :type => Pattern, :initial_length => lambda { pattern_table.max
+ 1 }
None
Demo
señor developer http://senordevelopershop.spreadshirt.de/ (europe) http://senordeveloper.spreadshirt.com/ (intl)