| 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: | - |
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.
[1] http://oku.edu.mie-u.ac.jp/~okumura/compression/history.html
(Have info that should be added here? E-mail.)
| 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 | 99 | 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 | 9 | 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 | ||||