gendx/lzma-rs

Support legacy LZMA format with `unpacked_size` 32bit long

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#13 opened on Nov 13, 2019

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 (10 comments) (0 reactions) (0 assignees)Rust (37 forks)auto 404
enhancementhelp wanted

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Description

Old versions of lzma SDKs (e.g. from 7zip) were using 32bit long field for the unpacked size in the header. Would be awesome to have support for these too. The LZMA SDK 4.05 (from 2004 year) for example handles it this way.

Contributor guide

Research direction
Investigate the LZMA legacy format that uses a 32 bit unsigned long for the unpacked size. Compare with the current implementation in the lzma rs codebase to understand the differences. Modify the decoder to detect and handle the legacy header format. Test with sample files from old LZMA SDK.
Tech stack
rust
Domain
data
Issue type
Feature
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.
Half day
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.
Clear
Prerequisites
RustGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
65