#jbig

[prettyquickpoetry]

“He doesn’t know a thing about ghosts,” Jack says. His teammate, Ferris, is sitting beside him at the folding table, focusing on the meters and sensors lighting up in front of them, but Jack has his eyes trained on the small tablet screen. It displays a live feed of the rest of the team in the other room. “Look at him,” Jack sneers, watching a small curly-haired blond man raise his hands and speak to seemingly no one. “What does he think he’s even doing? Psychic…” Jack says bitterly. “As if.” He crosses his arms. “And he’s—”

“Oh my god, would you stop?” Ferris, a young person with red and black split-dyed hair, exclaims. “I am trying to focus on the investigation. You know, that thing we’re doing?”

— Start of my WIP: Jack Believes in Ghosts

[script-ease]

Michael Tsai - Blog - FORCEDENTRY iMessage Zero-click Remote Code Execution

[jbig94-blog]

Логотип

[jbig94-blog]

Я вижу за улыбками злость

J-Big aka Joe Biggolow

[zxsu]

JBIG Android library published

Table of Contents

Design details

Where it come from?

Include the dependency into your gradle script

Start to use it

Please jump to jbig-android's home page.

1 Design details

jbig-android is just a jni level wrapper of jbig-kit, so it inherited its License as GPL v3. If you are an newbie of JNI programming, you can refer my JNI tutorial. Basically, JNI part is the key of porting jbig-kit to android platform. Beside the core implementation of this project, the sample code pleased me the most. I tried to wrote it in a MVC way, which took me the most time, and it succeed, Maybe I will use another post to describe this MVC paradigm and its apply in Android App. Of course, I learned this way and copy it from Chris Banes's sensational work philm.

2 Where it come from?

About years ago, I met this problem, the format of hand write signature in bank related system, like a POS. The customer sign in the screen(LED) during a bank card payment. And those signatures are stored in the back-end server of course, in a lossless image compression format, in this case is the JBIG. I studied this format, and implemented it in android platform, until my employer stopped use it and abandoned it in his product, I started to open source it. Yeah, I really enjoy my works in this field.

3 Include the dependency into your gradle script

allprojects { repositories { jcenter() maven { url "http://ift.tt/1iuzuMJ" } } }

Add my bintray repo into your root build.gradle.

dependencies { compile(group: 'org.jacob.lib.jbig', name: 'jbig-android', version: '1.0', ext: 'aar') }

Then, add above line into your modules's dependencies scope.

4 Start to use it

# encode code Bitmap[] bitmaps = ...; JbigCodec jbigCodec = JbigCodecFactory.getJbigCodec(JbigCodecFactory.CODEC.JNI_CODEC); byte[] jbigData = jbigCodec.encode(bitmaps);

Above code is what I said jbig encoding from multiple layers of Bitmaps. Because Jbig support multiple layers.

# jbigData is the above byte[] jbigData. JbigCodec jbigCodec = JbigCodecFactory.getJbigCodec(JbigCodecFactory.CODEC.JNI_CODEC); Bitmap[] bms = jbigCodec.decode(jbigData);

And this is the decoder part, the reverting process of above encoding, here it decode the jbigData byte array to multiple layers of Bitmaps.