Versions tested: 2.3
Optimal parameters: default
Links: http://info-zip.org
Authors: Phillip Katz, Jean-loup Gailly, Mark Adler
Algorithms: LZ+HUF
Notable peformances: -

info-zip

Haruhiko Okumura and Haruyasu Yoshizaki combined LZ and Huffman in their public domain compressors in the late 1980s. [1] Katz build upon this work and developed the ZIP format (PKZIP 2.0). Gailly and Adler made their own implementation of the ZIP compression (ZLIB, gzip). Using ZLIB, Info-ZIP implements ZIP format compatible with PKZIP and is licensed under BSD license. WinZip and practically all software use the code to implement support for ZIP files, making their compression performance identical to Info-ZIP.

For version 2.3 we use the official binaries: zip23xN.zip and unz550xN.exe. We use unzipsfx-gcc.exe for decoder size.

[1] http://oku.edu.mie-u.ac.jp/~okumura/compression/history.html

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Qualified configurations
Ver Rating CPR DPR S.E. R.E. Ratio C. kB/s D. kB/s
<none>
2.3 7 10 1 100 0 2.621 14613 27369
-1
2.3 3 5 0 98 0 2.422 26348 26897
-2
2.3 4 7 0 105 0 2.465 25316 27025
-3
2.3 4 8 0 107 0 2.505 22874 27153
-4
2.3 6 10 1 114 0 2.561 21514 27164
-5
2.3 7 11 1 111 0 2.602 18285 27343
-7
2.3 6 8 1 91 0 2.626 12681 27413
-8
2.3 5 6 1 68 0 2.631 8411 27427
-9
2.3 4 5 2 53 0 2.669 5732 27468

Version info

2.3, tar: no, mode: 32-bit, crc32: d8374850, decoder: 23 kB, tested: 2010 Apr 13
compression: zip.exe -r <args> <cfile> <src>
decompression: unzip.exe <cfile>
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