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{{FormatInfo
|formattype=electronic
|subcat=Compression
|released=~1996
}}
'''TLzrw1''' (also written '''Tlzrw1''') is a [[Delphi]] component (a kind of [[Pascal]] library) for data compression, including file compression. It was developed by Danny Heijl, based largely on other people's compression code.

There are two compressed file formats:
* Signature "<code>WRZL</code>" (read it backwards). Uses LZRW1/KH compression, by Kurt Haenen. The name implies that it's related to [[LZRW|LZRW1]] by Ross Williams.
* Signature "<code>!HZL</code>". Uses [[LZHUF]] compression.

== Discussion ==
More research is needed.

Unfortunately, files having the TLzrw1 signatures do not appear to be very portable. Some files likely use custom extensions of TLzrw1 format. Some might not be related to TLzrw1 at all. And the TLzrw1 formats are probably not platform-independent.

== Identification ==
Files using LZRW1/KH compression start with ASCII "{{magic|WRZL}}".

Files using LZHUF compression start with ASCII "{{magic|!HZL}}".

To confirm, look for "LZRWIdentifier"/"LZHIdentifier" in compon/LZRW1.pas.

It's possible that big-endian variants of these formats also exist, with signatures "{{magic|LZRW}}" and "{{magic|LZH!}}". The latter could be hard to distinguish from one of the [[The JAM Packer|JAM Packer]] formats.

== Software ==
* Tlzrw1 v1.01.00: [{{DiscMasterURL|browse/17006/SuperHack%20CD.bin/CODING/DELPHI/LZRW1K.ZIP/DELPHI/FREEWR/TLZRW1}}]
* TLzrw1 v2.01.00: [{{DiscMasterURL|browse/41962/VIOLET.dvd2011.iso/tools/Sources/Compression_Libraries_Sources.rar/tlzrw1}}]

== Sample files ==
* {{DiscMasterLink|search?detection=57525a4c*&dedup=dedup|DiscMaster search for WRZL signature}}
* {{DiscMasterLink|search?detection=21485a4c*&dedup=dedup|DiscMaster search for !HZL signature}}
* {{DiscMasterLink|browse/4457/Dokan%2001.iso/Japones/KanaPro/KP20wd.zip|KP20wd.zip}} → *.gi!
* [{{DiscMasterURL|browse/23599/pcwk_01_1999_B.iso/Polskie/Supstat}}] (most files)

TLzrw1 - Revision history

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Compression |released=~1996 }} '''TLzrw1''' (also written '''Tlzrw1''') is a Delphi component (a kind of Pascal library) fo..."