vulnerabilities. The author, Wei Dai states "This code is less clever, but hopefully more understandable and maintainable [than zlib]". 7-Zip: written by Igor Pavlov in C++, this version is freely licensed and achieves higher compression than zlib at the expense of CPU usage. Has an option to use the DEFLATE64 storage format. PuTTY 'sshzlib.c': a standalone implementation under the MIT License by Simon Tatham, it has full decoding capability, but only supports static tree only creation libflate: part of Plan 9 from Bell Labs, implements deflate compression Hyperbac: uses its own proprietary compression library (in C++ and Assembly) with an option to implement the DEFLATE64 storage format Zopfli: C implementation under the Apache License by Google; achieves highest compression at the expense of CPU usage. ZopfliPNG is a variation of Zopfli for use with PNG files. igzip: an encoder written in the x86 assembly language, released by Intel under the MIT License. 3x faster than zlib -1. Useful for compressing genomic data. AdvanceCOMP uses the higher compression ratio version of Deflate as implemented by 7-Zip (or optionally Zopfli in recent versions) to enable recompression of gzip, PNG, MNG and ZIP files with the possibility of smaller file sizes than zlib is able to achieve at maximum settings. Hardware encoders AHA361-PCIX/AHA362-PCIX from Comtech AHA. Comtech produced a PCI-X card (PCI-ID: 193f:0001) capable of compressing streams using Deflate at a rate of up to 3.0 Gbit/s (375 MB/s) for incoming uncompressed data. Accompanying the Linux kernel driver for the AHA361-PCIX is an "ahagzip" utility and customised "mod_deflate_aha" capable of using the hardware compression from Apache. The hardware is based on a Xilinx Virtex FPGA and four custom AHA3601 ASICs. The AHA361/AHA362 boards are limited to only handling static Huffman blocks and require software to be modified to add support — the cards were not able to support the full Deflate specification, meaning they could only reliably decode their own output (a stream that did not contain any dynamic Huffman type 2 blocks). StorCompress 300/MX3 from Indra Networks. This is a range of PCI (PCI-ID: 17b4:0011) or PCI-X cards featuring between one and six compression engines with claimed processing speeds of up to 3.6 Gbit/s (450 MB/s). A version of the cards are available with the separate brand WebEnhance specifically designed for web-serving use rather than SAN or backup use; a PCIe revision, the MX4E is also produced. AHA363-PCIe/AHA364-PCIe/AHA367-PCIe. In 2008, Comtech started