PKWARE DCL Implode

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(Added Identification section, copied from TTCOMP)
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'''PKWARE DCL Implode''' is a compressed data format associated with ''PKWARE Data Compression Library'' (DCL), a commercial data compression software product. It is not the only format supported by DCL, but it is possibly the most notable one.
 
'''PKWARE DCL Implode''' is a compressed data format associated with ''PKWARE Data Compression Library'' (DCL), a commercial data compression software product. It is not the only format supported by DCL, but it is possibly the most notable one.
  
DCL Implode is not the same format as [[ZIP]]'s old "implode" compression method (#6). It is unfortunate that there are two formats named "implode" associated with the same company. It ''can'' be used in ZIP, as compression method #10, but support for this is limited.
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The terms "blast" and "explode" are sometimes used in association with this format. When used as a file format, it may be identified as [[TTCOMP]].
  
The terms "blast" and "explode" are sometimes used in association with this format.
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== Disambiguation ==
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DCL Implode is not the same format as [[ZIP]]'s old "implode" compression method (#6). It is unfortunate that there are two formats named "implode" associated with the same company. It ''can'' be used in ZIP, as compression method #10, but support for this is limited.
  
 
== Identification ==
 
== Identification ==
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== Links ==
 
== Links ==
 
* [https://web.archive.org/web/20040811082907/http://www.pkware.com/products/developers/dcl/ 2004 archive of PKWARE DCL website]
 
* [https://web.archive.org/web/20040811082907/http://www.pkware.com/products/developers/dcl/ 2004 archive of PKWARE DCL website]
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See also [[TTCOMP#Software]].
  
 
[[Category:PKWARE]]
 
[[Category:PKWARE]]

Revision as of 15:10, 20 July 2021

File Format
Name PKWARE DCL Implode
Ontology

PKWARE DCL Implode is a compressed data format associated with PKWARE Data Compression Library (DCL), a commercial data compression software product. It is not the only format supported by DCL, but it is possibly the most notable one.

The terms "blast" and "explode" are sometimes used in association with this format. When used as a file format, it may be identified as TTCOMP.

Contents

Disambiguation

DCL Implode is not the same format as ZIP's old "implode" compression method (#6). It is unfortunate that there are two formats named "implode" associated with the same company. It can be used in ZIP, as compression method #10, but support for this is limited.

Identification

A DCL Implode datastream starts with a two-byte header. The first byte indicates the type of compression:

  • 0x00: binary compression
  • 0x01: ASCII compression (a method optimized for compressing text)

The second byte specifies the size of the dictionary:

  • 0x04: 1024 bytes
  • 0x05: 2048 bytes
  • 0x06: 4096 bytes

Most common is 0x00 0x06, indicating binary compression and a 4K dictionary.

Related formats

Specifications

Software

Links

See also TTCOMP#Software.

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