{
  "abstract": "An LZ77 codec bounds every match by one sliding window, trading cheap offsets for short matches against reach for long ones. Match-length-dependent windows refine this trade-off: each match length has its own window, and the decoder infers the offset range from the decoded length. We present two such codecs: WLZ4, a byte-aligned LZ4-class format with one-byte and flagged offsets, and WZIP, an entropy-coded Zstandard-class format. Each block begins with its decoded length, from which WZIP derives its widest window and a decoder sizes its output. LZ4 blocks may expand incompressible input by 0.4%; WLZ4 adds at most 15 bytes, WZIP 2. We describe the formats, threaded match finders, decoders and parser. On Silesia, WLZ4 reaches a ratio up to 16% above LZ4HC's, decoding more slowly, and WZIP exceeds Zstandard 22's ratio while its trusted decoder runs at 91% of Zstandard's speed (87% checked; on enwik9, about as fast).",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.14079",
  "author_total": 1,
  "authors": [
    {
      "name": "Yingquan \"Cody\" Wu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/54t0j4gb874hq.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.14079",
  "fulltext_url": null,
  "id": "54t0j4gb874hq",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.14079",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cs.IT"
    ],
    [
      "arxiv",
      "math.IT"
    ],
    [
      "openalex",
      "1702|Algorithms and Data Compression"
    ]
  ],
  "openalex": "W7221762827",
  "pdf_url": "https://arxiv.org/pdf/2610.14079",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-08",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/54t0j4gb874hq.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:15Z",
      "native_id": "2610.14079",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.14079"
    }
  ],
  "subjects": [
    {
      "field": "mathematics",
      "origin": "arxiv:math.IT",
      "subfield": "general"
    }
  ],
  "title": "WZIP and WLZ4: LZ77 Codecs with Match-Length-Dependent Sliding Windows",
  "title_text": "WZIP and WLZ4: LZ77 Codecs with Match-Length-Dependent Sliding Windows",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:15Z",
  "url": "https://research.draconitic.com/paper/54t0j4gb874hq",
  "venue": "arXiv",
  "versions": []
}