gendx/lzma-rs

Fail to decompress these data streams ("brcm-lzma" method?)

Open

#25 opened on Jan 22, 2020

View on GitHub
 (5 comments) (0 reactions) (0 assignees)Rust (37 forks)auto 404
enhancementhelp wanted

Repository metrics

Stars
 (151 stars)
PR merge metrics
 (PR metrics pending)

Description

Unpacking the data, and noted that some streams can't be unpacked with lzma-rs, see the attached files of the compressed and uncompressed chunks.

lzma_alt_samples.zip

The chunks were successfully unpacked with this library instead: https://github.com/firmadyne/sasquatch/tree/master/LZMA/lzmalt

The algorithm itself seems came out of the Broadcom LZMA modification.

Contributor guide

Research direction
Investigate the Broadcom LZMA variant used in the provided sample files and compare with the standard LZMA algorithm. Look at the firmadyne/sasquatch library implementation for reference. Then implement support in lzma rs.
Tech stack
rust
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
RustGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35