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LDArc and LDIFF - Just Solve the File Format Problem

LDArc and LDIFF

From Just Solve the File Format Problem
Revision as of 19:31, 25 May 2023 by Jsummers (Talk | contribs)

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File Format
Name LDArc and LDIFF
Ontology
Extension(s) .lzd
Released 1989

LDArc (also written LDarc), and its successor LDIFF (also written LDiff), are differential compression utilities for DOS, designed for binary files. They were developed by Kazuhiko Miki (also known for LArc).

There are at least three different versions of their native .LZD file format:

  • The "lz6" format created by LDArc v1.00-1.03.
  • The "LD6" format created by LDIFF v1.10-1.20.
  • The format created by LDIFF v2.00.

LDIFF v2.00 can also create self-running patches in COM format.

The "lz6" and "LD6" formats are similar to LHA, but not really compatible with it.

Contents

Identification

LDArc v1.00-1.03 files have ASCII "-lz6-" at offset 2.

LDIFF v1.10-1.20 files have ASCII "-LD6-" at offset 2.

LDIFF v2.00 files apparently have ASCII "LZ" at offset 4. They end with bytes 00 00.

COM files made by LDIFF v2.00 apparently have ASCII "SFX by LDiff" at offset 1021. The embedded LZD file starts at offset 1177.

Specifications

  • LDIFF v2.00 format is described in the included ldiff.man file (in Japanese).

Software

Sample files

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox

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