Decompressor Library

[Tabaie]

This PR implements creates a decompressor library capable of managing different blob versions and dictionaries. Its output consists of an RLP encoded list of blocks. Due to some information loss during compression, two pieces of information are represented "hackily":

• The block hash is in the ParentHash field, not the hash field itself, as go-ethereum computes that field itself, not allowing users to set it manually.
• The transaction from address is in the signature.R field.

NOTE Only the Go side has been tested. Need contribution from a Kotlin developer to make this merge-ready.

Checklist

• I wrote new tests for my new core changes.
• I have successfully ran tests, style checker and build against my new changes locally.
• I have informed the team of any breaking changes if there are any.

[github-actions]

Delta Summary - Kotlin Code Coverage

Generated on:	09/14/2024 - 15:26
Description	Previous	Current	Delta
Coverage date:	09/14/2024 - 15:26	09/14/2024 - 15:26
Tag:	118_10863448018	118_10863448018
Line coverage:	27.6%	27.6%	0.0%
Covered lines:	26071	26071	0
Coverable lines:	94280	94280	0
Total lines:	133202	133202	0
Branch coverage:	10.5%	10.5%	0.0%
Covered branches:	5638	5638	0
Total branches:	53419	53419	0
Method coverage:	Feature is only available for sponsors

[jpnovais]

Hi @Tabaie I made a release of the decompressor lib from this branch and created a basic test but it fails with error.

Maybe I am initializing the decompressor wrongly. Please take a take a look at the test. You can run them with

./gradlew jvm-libs:blob-decompressor:test

Error looking up function 'Error': dlsym(0x8b047c60, Error): symbol not found
java.lang.UnsatisfiedLinkError: Error looking up function 'Error': dlsym(0x8b047c60, Error): symbol not found
	at com.sun.jna.Function.<init>(Function.java:255)

[Tabaie]

@jpnovais the Kotlin side is probably all wrong. I was hoping to hammer that part out together with yourself or @gauravahuja.

^ seems like you've already done all that. I'll take a look today or tomorrow. 👍