czar

clean-room implementation of a XAR unarchiver

status

• [x] Header
  • [x] Magic
  • [x] Header size
  • [x] Version
  • [x] TOC length (compressed)
  • [x] TOC length (uncompressed)
  • [x] Checksum algorithm
    • [x] None
    • [x] SHA1
    • [x] MD5
• [x] TOC
  • [x] Extraction
  • [x] Parsing
  • [x] Checksum validation
• [x] Heap
  • [x] Extraction
    • [x] gzip/zlib
    • [x] bzip2
  • [x] Checksum validation
• [ ] File Metadata

current features

• archive info
• file listing
• checksum validation
• decompression

usage

Usage: czar [options] <xar_file>
Options:
  --strict      Fail extraction if any checksum validation fails
  --no-extract  Only validate checksums, don't extract files
  --help, -h    Show this help message

Files are extracted to ./<xar_file>.extracted/

examples

# Extract archive with checksum validation
./czar archive.xar

# Validate checksums only (no extraction)
./czar --no-extract archive.xar

# Strict mode - fail if any checksum is invalid
./czar --strict archive.xar

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This project, initially authored by Mara Robin Broda in 2018, is licensed under the GNU Lesser General Public License v3.0