LZEXE - Revision history

Jsummers at 16:46, 6 August 2025

2025-08-06T16:46:57Z

2025-07-02T17:18:26Z

‎Links

2024-05-15T00:55:40Z

sample files

2023-09-08T12:37:37Z

‎Identification

2022-08-01T15:40:44Z

‎Identification

2022-07-25T12:26:17Z

‎Links

2022-07-23T18:12:52Z

‎Identification

2022-07-04T16:10:57Z

‎Identification

2022-04-09T17:17:12Z

‎Software

2022-04-06T21:21:34Z

‎Software

@@ Line 18: / Line 18: @@
 Also, the author's signature appears in this area. Version 0.90 has "<code>*Fabrice BELLARD*</code>" at ''start-of-execution''+269. Versions 0.91 and 0.91e have "<code>*FAB*</code>" at ''start-of-execution''+233.
-Hacked or otherwise patched variants of LZEXE seem to be relatively rare -- or maybe they're just hard to identify as such. Known examples:
+== See also ==
-* [[LHARK#Self-extracting archives]]
+* [[CEBE]]
-* [[PCX2EXE (Arminio Grgic)]]
+* [[LHARK#Self-extracting archives]] - Patched variant
 == Software ==
@@ Line 27: / Line 28: @@
 ** {{CdTextfiles|rbbsv3n1/magn/lzexe_e.zip|lzexe_e.zip}} - v0.90 with documentation translated to English by Luigi M. Bianchi
 * [https://bellard.org/lzexe/lzexe91.zip LZEXE v0.91] (1990-01-02) - French
 ** {{CdTextfiles|pcmedic/utils/compress/lzexe91.zip|lzexe91.zip}} - v0.91 with English-language supporting material by Luigi M. Bianchi and Earle Robinson
 *  [https://bellard.org/lzexe/lzexe91e.zip LZEXE v0.91e] (1990-10-15) (also {{CdTextfiles|megademo2/UTILITY/FILE/LZEXE91E.ZIP|here}}) - English
@@ Line 61: / Line 63: @@
 * [https://www.lodsb.com/reversing-lz91-from-commander-keen Reversing LZ91 from Commander Keen]
 * [https://cosmodoc.org/topics/lzexe/ Cosmodoc: LZEXE]

@@ Line 58: / Line 58: @@
 == Links ==
-* [https://bellard.org/lzexe.html LZEXE home page]
+* [https://bellard.org/lzexe/ LZEXE home page]
 * [https://www.lodsb.com/reversing-lz91-from-commander-keen Reversing LZ91 from Commander Keen]
 * [https://cosmodoc.org/topics/lzexe/ Cosmodoc: LZEXE]

@@ Line 53: / Line 53: @@
 * [{{SACFTPURL|pack|lzalt03.zip}} LZALT v0.03] by Codon Software
 * [{{SACFTPURL|pack|lzealt.zip}} LZEALT v1.04] by De Trans Software
 == Links ==

← Older revision		Revision as of 12:37, 8 September 2023
Line 17:		Line 17:

	Also, the author's signature appears in this area. Version 0.90 has "<code>Fabrice BELLARD</code>" at ''start-of-execution''+269. Versions 0.91 and 0.91e have "<code>FAB</code>" at ''start-of-execution''+233.		Also, the author's signature appears in this area. Version 0.90 has "<code>Fabrice BELLARD</code>" at ''start-of-execution''+269. Versions 0.91 and 0.91e have "<code>FAB</code>" at ''start-of-execution''+233.
		+
		+	Hacked or otherwise patched variants of LZEXE seem to be relatively rare -- or maybe they're just hard to identify as such. Known examples:
		+	* [[LHARK#Self-extracting archives]]
		+	* [[PCX2EXE (Arminio Grgic)]]

	== Software ==		== Software ==

← Older revision		Revision as of 15:40, 1 August 2022
Line 15:		Line 15:

	Apparently, the 300+ bytes starting at the ''start-of-execution'' point are always the same for a given version of LZEXE -- and there are only three known versions. A possible signature is the byte sequence {{magic\|06 0e 1f 8b 0e 0c 00 8b f1 4e 89 f7 8c db 03 1e 0a 00 8e c3}}, starting either at the ''start-of-execution'' point, or (for v0.91e) one byte beyond it.		Apparently, the 300+ bytes starting at the ''start-of-execution'' point are always the same for a given version of LZEXE -- and there are only three known versions. A possible signature is the byte sequence {{magic\|06 0e 1f 8b 0e 0c 00 8b f1 4e 89 f7 8c db 03 1e 0a 00 8e c3}}, starting either at the ''start-of-execution'' point, or (for v0.91e) one byte beyond it.
		+
		+	Also, the author's signature appears in this area. Version 0.90 has "<code>Fabrice BELLARD</code>" at ''start-of-execution''+269. Versions 0.91 and 0.91e have "<code>FAB</code>" at ''start-of-execution''+233.

	== Software ==		== Software ==

← Older revision		Revision as of 12:26, 25 July 2022
Line 51:		Line 51:
	* [https://bellard.org/lzexe.html LZEXE home page]		* [https://bellard.org/lzexe.html LZEXE home page]
	* [https://www.lodsb.com/reversing-lz91-from-commander-keen Reversing LZ91 from Commander Keen]		* [https://www.lodsb.com/reversing-lz91-from-commander-keen Reversing LZ91 from Commander Keen]
		+	* [https://cosmodoc.org/topics/lzexe/ Cosmodoc: LZEXE]

@@ Line 10: / Line 10: @@
 LZEXE-compressed files normally have ASCII "{{magic|LZ09}}" (v0.90) or "{{magic|LZ91}}" (v0.91 or 0.91e) at offset 28.
-However, it was not uncommon for LZEXE users to modify this signature, for various reasons. One example is [[ARJ#Self-extracting archives|ARJ self-extracting archives]], which have signature "{{magic|RJSX}}".
+However, it was not uncommon for LZEXE users to modify this signature, for various reasons. Examples include [[ARJ#Self-extracting archives|ARJ self-extracting archives]], which have signature "{{magic|RJSX}}", and some [[RAR#Self-extracting archives|RAR self-extracting archives]], with signature "{{magic|RSFX}}".
 More-robust identification is possible, in particular by looking at bytes near the ''start-of-execution'' point (refer to [[MS-DOS EXE#Special file positions]]). This is at a different location in every file.

@@ Line 8: / Line 8: @@
 == Identification ==
-LZEXE-compressed files normally have ASCII "{{magic|LZ09}}" or "{{magic|LZ91}}" at offset 28.
+LZEXE-compressed files normally have ASCII "{{magic|LZ09}}" (v0.90) or "{{magic|LZ91}}" (v0.91 or 0.91e) at offset 28.
-As with most compressed executable formats, more-robust identification is possible, by looking for the characteristic decompression code.
+However, it was not uncommon for LZEXE users to modify this signature, for various reasons. One example is [[ARJ#Self-extracting archives|ARJ self-extracting archives]], which have signature "{{magic|RJSX}}".
 == Software ==

@@ Line 13: / Line 13: @@
 == Software ==
-=== Compression software ===
+Compression:
 * {{CdTextfiles|californiacollect/his042/lzexe.zip|LZEXE v0.90}} (1989-10-30) - French
 ** {{CdTextfiles|rbbsv3n1/magn/lzexe_e.zip|lzexe_e.zip}} - v0.90 with documentation translated to English by Luigi M. Bianchi
@@ Line 22: / Line 22: @@
 * {{CdTextfiles|pcmedic/utils/compress/lzexeeng.zip|lzexeeng.zip}} - English translation of v0.91, unknown origin
-=== Static decompression software ===
+Decompression, general:
 * UNLZEXE - A widely-distributed open source utility, originally by Mitugu Kurizono (Kou). Versions "0.6" and above include patches by other authors, and might be unofficial.
 ** {{CdTextfiles|swinnund/disk3/FILEUTIL/UNLZEX02.ZIP|v0.2}} (1990-03-29)
@@ Line 34: / Line 34: @@
 * [https://github.com/samrussell/rizzle Rizzle]
-=== Dynamic decompression software ===
+Decompression, for DOS:
-* For some examples, see [[Executable compression#Decompression software]].
+* See [[Executable compression#Decompression software]] for some multi-format utilities that support LZEXE.
-=== Protectors ===
+Protectors (utilities that modify a compressed file to make it more difficult to identify and/or decompress):
 (utilities that modify a compressed file to make it more difficult to identify and/or decompress)
 * [{{SACFTPURL|pack|antilz.zip}} ANTI-UNLZEXE]