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rar-format

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UpdatedMay 26, 2026 at 14:31

Reference the RAR/RAR5 archive container format and UnRAR source behavior. Use when an AI agent needs to answer questions or make code changes involving RAR signatures, RAR5 vint fields, block headers, file/service headers, extra records, solid archives, multivolume parts, encryption headers, recovery records, quick-open data, or SharpCompress Rar parsing and extraction behavior.

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adamhathcock

adamhathcock/sharpcompress

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Software DevelopersComputer and Mathematical Occupations·SOC 15-1252

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name	rar-format
description	Reference the RAR/RAR5 archive container format and UnRAR source behavior. Use when an AI agent needs to answer questions or make code changes involving RAR signatures, RAR5 vint fields, block headers, file/service headers, extra records, solid archives, multivolume parts, encryption headers, recovery records, quick-open data, or SharpCompress Rar parsing and extraction behavior.

Rar Format

Use this skill for RAR container-format work. It provides a local, SharpCompress-oriented reference for RAR 5.0 archive blocks, older RAR header compatibility, UnRAR source behavior, and current SharpCompress Rar implementation boundaries.

Reference

Read references/rar-format.md when the task depends on RAR binary layout, RAR4 vs RAR5 signatures, RAR5 vint encoding, block/header flags, file and service header fields, extra records, encrypted headers, solid archives, split volumes, redirection records, or current SharpCompress Rar support boundaries.
Treat the reference as an implementation guide, not a standards replacement. It summarizes reference/RAR 5.0 archive format.htm and selected files under reference/unrar/, especially headers5.hpp, headers.hpp, arcread.cpp, rawread.*, crypt*.cpp, qopen.*, volume.*, recvol*.cpp, unpack*.cpp, and blake2sp.*.
Prefer the SharpCompress support matrix in the reference over generic RAR assumptions when changing code. RAR is a read-only format in SharpCompress, and metadata/service-header support is intentionally partial.

Workflow

Identify which layer is involved: signature detection, RAR4 headers, RAR5 headers, vint parsing, block flags, extra records, file/service metadata, encrypted headers, multivolume handling, decompression, reader/archive API behavior, or tests.
Open the relevant section in references/rar-format.md and use the source-file pointers before changing code.
For header parsing changes, cross-check sync and async implementations: MarkHeader.cs, RarHeader.cs, RarHeaderFactory.cs, FileHeader.cs, Flags.cs, and their async counterparts.
For extraction changes, verify split and solid archive behavior with RarArchive, RarReader, RarStream, and the unpacker files under src/SharpCompress/Compressors/Rar/.
For support claims, keep unsupported or partial features explicit: RAR writing, pre-RAR4 archives, complete service-header semantics, quick-open use, recovery reconstruction, and encryption/version constraints.

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name	rar-format
description	Reference the RAR/RAR5 archive container format and UnRAR source behavior. Use when an AI agent needs to answer questions or make code changes involving RAR signatures, RAR5 vint fields, block headers, file/service headers, extra records, solid archives, multivolume parts, encryption headers, recovery records, quick-open data, or SharpCompress Rar parsing and extraction behavior.

Rar Format

Reference

Read references/rar-format.md when the task depends on RAR binary layout, RAR4 vs RAR5 signatures, RAR5 vint encoding, block/header flags, file and service header fields, extra records, encrypted headers, solid archives, split volumes, redirection records, or current SharpCompress Rar support boundaries.
Treat the reference as an implementation guide, not a standards replacement. It summarizes reference/RAR 5.0 archive format.htm and selected files under reference/unrar/, especially headers5.hpp, headers.hpp, arcread.cpp, rawread.*, crypt*.cpp, qopen.*, volume.*, recvol*.cpp, unpack*.cpp, and blake2sp.*.
Prefer the SharpCompress support matrix in the reference over generic RAR assumptions when changing code. RAR is a read-only format in SharpCompress, and metadata/service-header support is intentionally partial.

Workflow

Identify which layer is involved: signature detection, RAR4 headers, RAR5 headers, vint parsing, block flags, extra records, file/service metadata, encrypted headers, multivolume handling, decompression, reader/archive API behavior, or tests.
Open the relevant section in references/rar-format.md and use the source-file pointers before changing code.
For header parsing changes, cross-check sync and async implementations: MarkHeader.cs, RarHeader.cs, RarHeaderFactory.cs, FileHeader.cs, Flags.cs, and their async counterparts.
For extraction changes, verify split and solid archive behavior with RarArchive, RarReader, RarStream, and the unpacker files under src/SharpCompress/Compressors/Rar/.
For support claims, keep unsupported or partial features explicit: RAR writing, pre-RAR4 archives, complete service-header semantics, quick-open use, recovery reconstruction, and encryption/version constraints.